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@inproceedings {INPROC-2019-12,
   author = {Christoph Stach},
   title = {{Konzepte zum Schutz privater Muster in Zeitreihendaten: IoT-Anwendungen im Spannungsfeld zwischen Servicequalit{\"a}t und Datenschutz}},
   booktitle = {Informatik 2019: 50 Jahre Gesellschaft f{\"u}r Informatik – Informatik f{\"u}r Gesellschaft, Tagungsband der 49. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI), 23.09. - 26.09.2019, Kassel},
   publisher = {GI Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics (LNI)},
   pages = {1--14},
   type = {Conference Paper},
   month = {September},
   year = {2019},
   keywords = {Datenschutz; Zeitreihendaten; IoT; DSGVO; ePrivacy-Verordnung; TICK-Stack},
   language = {German},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     G.1.10 Numerical Analysis Applications},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Obwohl das Internet der Dinge (IoT) die Voraussetzung f{\"u}r smarte Anwendungen schafft, die signifikante Vorteile gegen{\"u}ber traditionellen Anwendungen bieten, stellt die zunehmende Verbreitung von IoT-f{\"a}higen Ger{\"a}ten auch eine immense Gef{\"a}hrdung der Privatheit dar. IoT-Anwendungen sammeln eine Vielzahl an Daten und senden diese zur Verarbeitung an ein leistungsstarkes Back-End. Hierbei werden umfangreiche Erkenntnisse {\"u}ber den Nutzer gewonnen. Erst dieses Wissen erm{\"o}glicht die Servicevielfalt die IoT-Anwendungen bieten. Der Nutzer muss daher einen Kompromiss aus Servicequalit{\"a}t und Datenschutz treffen. Heutige Datenschutzans{\"a}tze ber{\"u}cksichtigen dies unzureichend und sind dadurch h{\"a}ufig zu restriktiv. Aus diesem Grund stellen wir neue Konzepte zum Schutz privater Daten f{\"u}r das IoT vor. Diese ber{\"u}cksichtigen die speziellen Eigenschaften der im IoT zum Einsatz kommenden Zeitreihendaten. So kann die Privatheit des Nutzers gew{\"a}hrleistet werden, ohne die Servicequalit{\"a}t unn{\"o}tig einzuschr{\"a}nken. Basierend auf den TICK-Stack beschreiben wir Implementierungsans{\"a}tze f{\"u}r unsere Konzepte, die einem Privacy-by-Design-Ansatz folgen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-12&engl=1}
}
@inproceedings {INPROC-2019-10,
   author = {Christian Weber and Pascal Hirmer and Peter Reimann and Holger Schwarz},
   title = {{A New Process Model for the Comprehensive Management of Machine Learning Models}},
   booktitle = {Proceedings of the 21st International Conference on Enterprise Information Systems (ICEIS); Heraklion, Crete, Greece, May 3-5, 2019},
   editor = {Joaquim Filipe and Michal Smialek and Alexander Brodsky and Slimane Hammoudi},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {415--422},
   type = {Conference Paper},
   month = {May},
   year = {2019},
   isbn = {978-989-758-372-8},
   doi = {10.5220/0007725304150422},
   keywords = {Model Management; Machine Learning; Analytics Process},
   language = {English},
   cr-category = {I.2 Artificial Intelligence},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The management of machine learning models is an extremely challenging task. Hundreds of prototypical models are being built and just a few are mature enough to be deployed into operational enterprise information systems. The lifecycle of a model includes an experimental phase in which a model is planned, built and tested. After that, the model enters the operational phase that includes deploying, using, and retiring it. The experimental phase is well known through established process models like CRISP-DM or KDD. However, these models do not detail on the interaction between the experimental and the operational phase of machine learning models. In this paper, we provide a new process model to show the interaction points of the experimental and operational phase of a machine learning model. For each step of our process, we discuss according functions which are relevant to managing machine learning models.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-10&engl=1}
}
@inproceedings {INPROC-2019-09,
   author = {Christoph Stach and Bernhard Mitschang},
   title = {{ECHOES: A Fail-safe, Conflict Handling, and Scalable Data Management Mechanism for the Internet of Things}},
   booktitle = {Proceedings of the 23rd European Conference on Advances in Databases and Information Systems: ADBIS '19; Bled, Slovenia, September 8-11, 2019},
   editor = {Tatjana Welzer and Johann Eder and Vili Podgorelec and Aida Kamisalic Latific},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Computer Science (LNCS)},
   pages = {1--16},
   type = {Conference Paper},
   month = {September},
   year = {2019},
   keywords = {Internet of Things; Data Exchange; Synchronization Protocol},
   language = {English},
   cr-category = {H.2.7 Database Administration,     H.2.4 Database Management Systems},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The Internet of Things (IoT) and Smart Services are becoming increasingly popular. Such services adapt to a user's needs by using sensors to detect the current situation. Yet, an IoT service has to capture its required data by itself, even if another service has already captured it before. There is no data exchange mechanism adapted to the IoT which enables sharing of sensor data among services and across devices. Therefore, we introduce a data management mechanism for the IoT. Due to its applied state-based synchronization protocol called ECHOES. It is fail-safe in case of connection failures, it detects and handles data conflicts, it is geared towards devices with limited resources, and it is highly scalable. We embed ECHOES into a data provisioning infrastructure, namely the Privacy Management Platform and the Secure Data Container. Evaluation results verify the practicability of our approach.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-09&engl=1}
}
@inproceedings {INPROC-2019-08,
   author = {Cornelia Kiefer and Peter Reimann and Bernhard Mitschang},
   title = {{A Hybrid Information Extraction Approach Exploiting Structured Data Within a Text Mining Process}},
   booktitle = {18. Fachtagung des GI-Fachbereichs ,,Datenbanken und Informationssysteme (DBIS), 4.-8. M{\"a}rz 2019, Rostock, Germany, Proceedings.},
   editor = {Torsten Grust and Felix Naumann and Alexander B{\"o}hm and Wolfgang Lehner and Theo H{\"a}rder and Erhard et al. Rahm},
   address = {Bonn},
   publisher = {Gesellschaft f$\backslash$``{u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {149--168},
   type = {Conference Paper},
   month = {March},
   year = {2019},
   keywords = {information extraction; clustering; text mining; free text fields},
   language = {English},
   cr-category = {I.2.7 Natural Language Processing},
   ee = {https://doi.org/10.18420/btw2019-10},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Many data sets encompass structured data fields with embedded free text fields. The text fields allow customers and workers to input information which cannot be encoded in structured fields. Several approaches use structured and unstructured data in isolated analyses. The result of isolated mining of structured data fields misses crucial information encoded in free text. The result of isolated text mining often mainly repeats information already available from structured data. The actual information gain of isolated text mining is thus limited. The main drawback of both isolated approaches is that they may miss crucial information. The hybrid information extraction approach suggested in this paper adresses this issue. Instead of extracting information that in large parts was already available beforehand, it extracts new, valuable information from free texts. Our solution exploits results of analyzing structured data within the text mining process, i.e., structured information guides and improves the information extraction process on textual data. Our main contributions comprise the description of the concept of hybrid information extraction as well as a prototypical implementation and an evaluation with two real-world data sets from aftersales and production with English and German free text fields.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-08&engl=1}
}
@inproceedings {INPROC-2019-07,
   author = {Cornelia Kiefer},
   title = {{Quality Indicators for Text Data}},
   booktitle = {18. Fachtagung des GI-Fachbereichs ,,Datenbanken und Informationssysteme (DBIS), 4.-8. M{\"a}rz 2019, Rostock, Germany, Workshopband.},
   editor = {Holger Meyer and Norbert Ritter and Andreas Thor and Daniela Nicklas and Andreas Heuer and Meike Klettke},
   address = {Bonn},
   publisher = {Gesellschaft f$\backslash$``{u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Dagstuhl Reports},
   pages = {145--154},
   type = {Conference Paper},
   month = {March},
   year = {2019},
   keywords = {data quality; text data quality; text mining; text analysis; quality indicators for text data},
   language = {English},
   cr-category = {I.2.7 Natural Language Processing},
   ee = {https://doi.org/10.18420/btw2019-ws-15},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Textual data sets vary in terms of quality. They have different characteristics such as the average sentence length or the amount of spelling mistakes and abbreviations. These text characteristics have influence on the quality of text mining results. They may be measured automatically by means of quality indicators. We present indicators, which we implemented based on natural language processing libraries such as Stanford CoreNLP and NLTK. We discuss design decisions in the implementation of exemplary indicators and provide all indicators on GitHub. In the evaluation, we investigate freetexts from production, news, prose, tweets and chat data and show that the suggested indicators predict the quality of two text mining modules.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-07&engl=1}
}
@inproceedings {INPROC-2019-06,
   author = {Christoph Stach and Frank Steimle and Clementine Gritti and Bernhard Mitschang},
   title = {{PSSST! The Privacy System for Smart Service Platforms: An Enabler for Confidable Smart Environments}},
   booktitle = {Proceedings of the 4th International Conference on Internet of Things, Big Data and Security (IoTBDS '19)},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--12},
   type = {Conference Paper},
   month = {May},
   year = {2019},
   keywords = {Privacy; Access Control; Internet of Things; Smart Service Platform; Sensors; Actuators; Stream Processing},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The Internet of Things and its applications are becoming increasingly popular. Especially Smart Service Platforms like Alexa are in high demand. Such a platform retrieves data from sensors, processes them in a back-end, and controls actuators in accordance with the results. Thereby, all aspects of our everyday life can be managed. In this paper, we reveal the downsides of this technology by identifying its privacy threats based on a real-world application. Our studies show that current privacy systems do not tackle these issues adequately. Therefore, we introduce PSSST!, a user-friendly and comprehensive privacy system for Smart Service Platforms limiting the amount of disclosed private information while maximizing the quality of service at the same time.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-06&engl=1}
}
@inproceedings {INPROC-2019-03,
   author = {Christoph Stach and Corinna Giebler and Simone Schmidt},
   title = {{Zuverl{\"a}ssige Versp{\"a}tungsvorhersagen mithilfe von TAROT}},
   booktitle = {Tagungsband der 18. GI-Fachtagung Datenbanksysteme f{\"u}r Business, Technologie und Web},
   publisher = {GI Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics (LNI)},
   pages = {1--4},
   type = {Demonstration},
   month = {March},
   year = {2019},
   keywords = {Versp{\"a}tungsvorhersage; {\"O}PNV; deskriptive Analyse; pr{\"a}diktive Analyse; Concept Drift},
   language = {German},
   cr-category = {H.2.8 Database Applications,     H.2.4 Database Management Systems},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Bei der Einhaltung von Schadstoffwerten nehmen {\"o}ffentliche Verkehrsmittel eine immer entscheidendere Rolle ein. Daher wird vermehrt darauf geachtet, deren Attraktivit{\"a}t zu erh{\"o}hen. Ein wichtiger Punkt hierbei ist die Vorhersagegenauigkeit von Versp{\"a}tungen zu verbessern, damit Fahrg{\"a}ste entsprechend planen k{\"o}nnen. Die aktuell angewandten Ans{\"a}tze sind h{\"a}ufig ungenau, da sie die zur Verf{\"u}gung stehenden Daten nicht ausreichend nutzen. In diesem Beitrag stellen wir daher mit TAROT ein System vor, das mittels pr{\"a}diktiver Analysen die Vorhersagegenauigkeit von Versp{\"a}tungen verbessert, indem es in den Modellen Versp{\"a}tungsfortpflanzungen ber{\"u}cksichtigt. Dar{\"u}ber hinaus ist es in der Lage, im Fall einer St{\"o}rung augenblicklich auf ein besseres Vorhersagemodell umzusteigen und auf sowohl schleichende als auch abrupte Ver{\"a}nderungen automatisch zu reagieren. Die Vorteile dieser Eigenschaften lassen sich in unserem TAROT-Demonstrator anhand von vier repr{\"a}sentativen Anwendungsszenarien zeigen. Auch wenn sich die gezeigten Szenarien alle auf die Versp{\"a}tungsvorhersage von S-Bahnen beziehen, lassen sich die Konzepte von TAROT auch auf viele andere Anwendungsbereiche (z.B. zur Bestimmung von Produktionszeiten in der Industrie 4.0) anwenden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-03&engl=1}
}
@inproceedings {INPROC-2019-02,
   author = {Christoph Stach and Frank Steimle},
   title = {{Recommender-based Privacy Requirements Elicitation - EPICUREAN: An Approach to Simplify Privacy Settings in IoT Applications with Respect to the GDPR}},
   booktitle = {Proceedings of the 34th ACM/SIGAPP Symposium On Applied Computing (PDP)},
   publisher = {ACM Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {April},
   year = {2019},
   keywords = {privacy requirements elicitation; recommender system; knowledge modeling; clustering; association rules; privacy system; IoT; eHealth},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     J.4 Social and Behavioral Sciences,     H.3.3 Information Search and Retrieval},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Due to the Internet of Things (IoT), a giant leap towards a quantified self is made, i.e., more and more aspects of our lives are being captured, processed, and analyzed. This has many positive implications, e.g., Smart Health services help to relieve patients as well as physicians and reduce treatment costs. However, the price for such services is the disclosure of a lot of private data. For this reason, Smart Health services were particularly considered by the European General Data Protection Regulation (GDPR): a data subject's explicit consent is required when such a service processes his or her data. However, the elicitation of privacy requirements is a shortcoming in most IoT privacy systems. Either the user is overwhelmed by too many options or s/he is not sufficiently involved in the decision process. For this reason, we introduce EPICUREAN, a recommender-based privacy requirements elicitation approach. EPICUREAN uses modeling and data mining techniques to determine and recommend appropriate privacy settings to the user. The user is thus considerably supported but remains in full control over his or her private data.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2019-02&engl=1}
}
@inproceedings {INPROC-2018-41,
   author = {Michael Wurster and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann},
   title = {{Modeling and Automated Execution of Application Deployment Tests}},
   booktitle = {Proceedings of the IEEE 22nd International Enterprise Distributed Object Computing Conference (EDOC)},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {171--180},
   type = {Conference Paper},
   month = {October},
   year = {2018},
   doi = {10.1109/EDOC.2018.00030},
   keywords = {Testing; Declarative Application Deployment; Test Automation; Model-based Testing; TOSCA},
   language = {English},
   cr-category = {D.2.5 Software Engineering Testing and Debugging,     D.2.9 Software Engineering Management},
   contact = {Michael Wurster michael.wurster@iaas.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {In recent years, many deployment systems have been developed that process deployment models to automatically provision applications. The main objective of these systems is to shorten delivery times and to ensure a proper execution of the deployment process. However, these systems mainly focus on the correct technical execution of the deployment, but do not check whether the deployed application is working properly. Especially in DevOps scenarios where applications are modified frequently, this can quickly lead to broken deployments, for example, if a wrong component version was specified in the deployment model that has not been adapted to a new database schema. Ironically, even hardly noticeable errors in deployment models quickly result in technically successful deployments, which do not work at all. In this paper, we tackle these issues. We present a modeling concept that enables developers to define deployment tests directly along with the deployment model. These tests are then automatically run by a runtime after deployment to verify that the application is working properly. To validate the technical feasibility of the approach, we applied the concept to TOSCA and extended an existing open source TOSCA runtime.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-41&engl=1}
}
@inproceedings {INPROC-2018-38,
   author = {Andreas Liebing and Lutz Ashauer and Uwe Breitenb{\"u}cher and Thomas G{\"u}nther and Michael Hahn and K{\'a}lm{\'a}n K{\'e}pes and Oliver Kopp and Frank Leymann and Bernhard Mitschang and Ana C. Franco da Silva and Ronald Steinke},
   title = {{The SmartOrchestra Platform: A Configurable Smart Service Platform for IoT Systems}},
   booktitle = {Papers from the 12th Advanced Summer School on Service-Oriented Computing (SummerSoC 2018)},
   publisher = {IBM Research Division},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {14--21},
   type = {Conference Paper},
   month = {October},
   year = {2018},
   keywords = {SmartOrchestra Platform; Smart Services; Cyber-Physical Systems; Internet of Things},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems,     D.2.7 Software Engineering Distribution, Maintenance, and Enhancement,     D.2.12 Software Engineering Interoperability},
   ee = {https://www.2018.summersoc.eu/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The Internet of Things is growing rapidly while still missing a universal operat-ing and management platform for multiple diverse use cases. Such a platform should provide all necessary functionalities and the underlying infrastructure for the setup, execution and composition of Smart Services. The concept of Smart Services enables the connection and integration of cyber-physical systems (CPS) and technologies (i.e., sensors and actuators) with business-related applications and services. Therefore, the SmartOrchestra Platform provides an open and standards-based service platform for the utilization of public administrative and business-related Smart Services. It combines the features of an operating plat-form, a marketplace, a broker, and a notary for a cloud-based operation of Smart Services. Thus, users of cyber-physical systems are free to choose their control applications, no matter what device they are using (e.g., smartphone, tablet or personal computer) and they also become independent of the manufacturers’ software. This will enable new business opportunities for different stakeholders in the market and allows flexibly composing Smart Services.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-38&engl=1}
}
@inproceedings {INPROC-2018-34,
   author = {Ana Cristina Franco da Silva and Pascal Hirmer and Rafael Koch Peres and Bernhard Mitschang},
   title = {{An Approach for CEP Query Shipping to Support Distributed IoT Environments}},
   booktitle = {Proceedings of the IEEE International Conference on Pervasive Computing and Communications Workshops (PerCom Workshops)},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {247--252},
   type = {Conference Paper},
   month = {October},
   year = {2018},
   isbn = {978-1-5386-3227-7},
   doi = {10.1109/PERCOMW.2018.8480241},
   language = {English},
   cr-category = {H.0 Information Systems General},
   ee = {https://ieeexplore.ieee.org/document/8480241},
   contact = {francoaa@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-34&engl=1}
}
@inproceedings {INPROC-2018-33,
   author = {Karoline Saatkamp and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann},
   title = {{Application Scenarios for Automated Problem Detection in TOSCA Topologies by Formalized Patterns}},
   booktitle = {Papers From the 12th Advanced Summer School of Service-Oriented Computing (SummerSOC 2018)},
   publisher = {IBM Research Division},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {43--53},
   type = {Conference Paper},
   month = {October},
   year = {2018},
   keywords = {Cloud Computing Patterns; Formalization; Prolog; TOSCA},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     D.2.7 Software Engineering Distribution, Maintenance, and Enhancement,     K.6 Management of Computing and Information Systems},
   ee = {https://www.2018.summersoc.eu/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-33&engl=1}
}
@inproceedings {INPROC-2018-28,
   author = {Mathias Mormul and Pascal Hirmer and Matthias Wieland and Bernhard Mitschang},
   title = {{Layered Modeling Approach for Distributed Situation Recognition in Smart Environments}},
   booktitle = {Tagungsband: SMART 2018, The Seventh International Conference on Smart Cities, Systems, Devices and Technologies},
   publisher = {Xpert Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {47--53},
   type = {Conference Paper},
   month = {July},
   year = {2018},
   isbn = {978-1-61208-653-8},
   keywords = {Industry 4.0; Edge Computing; Smart Factories; Smart Homes; Situation Recognition; Distribution Pattern},
   language = {English},
   cr-category = {H.0 Information Systems General},
   contact = {mathias.mormul@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-28&engl=1}
}
@inproceedings {INPROC-2018-24,
   author = {Dominik Lucke and Peter Einberger and Daniel Schel and Michael Luckert and Matthias Schneider and Emir Cuk and Thomas Bauernhansl and Matthias Wieland and Frank Steimle and Bernhard Mitschang},
   title = {{Implementation of the MIALinx Integration Concept for Future Manufacturing Environments to Enable Retrofitting of Machines}},
   booktitle = {Proceedings of the 12th CIRP Conference on Intelligent Computation in Manufacturing Engineering (CIRP ICME '18); Naples, Italy, July 18-20, 2018},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {596--601},
   type = {Conference Paper},
   month = {July},
   year = {2018},
   doi = {10.1016/j.procir.2019.02.084},
   keywords = {Manufacturing; Smart Factory; Industrie 4.0; Manufacturing Service Bus; Rules; Integration; MIALinx},
   language = {English},
   cr-category = {H.4.0 Information Systems Applications General,     I.2.1 Applications and Expert Systems},
   ee = {http://www.sciencedirect.com/science/article/pii/S221282711930201X},
   contact = {Frank.Steimle@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Manufacturing has to adapt permanently to changing situations in order to stay competitive. It demands a flexible and easy-to-use integration of production equipment and ICT systems on the shop floor. The contribution of this paper is the presentation of the implementation architecture of the Manufacturing Integration Assistant (MIALinx) that simplifies this challenge. The integration steps range from integrating sensors over collecting and rule-based processing of sensor information to the execution of required actions. Furthermore, we describe the implementation of MIALinx by commissioning it in a manufacturing environment to retrofit legacy machines for Industrie 4.0. Finally, we validate the suitability of our approach by applying our solution in the production environment of a medium-size company.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-24&engl=1}
}
@inproceedings {INPROC-2018-23,
   author = {Dominik Brenner and Christian Weber and Juergen Lenz and Engelbert Westk{\"a}mper},
   title = {{Total Tool Cost of Ownership Indicator for Holistical Evaluations of Improvement Measures within the Cutting Tool Life Cycle}},
   booktitle = {51st CIRP Conference on Manufacturing Systems (CIRP CMS), Stockholm, Sweden, May 16-18, 2018},
   editor = {Lihui Wang and Torsten Kjellberg and Xi Vincent Wang and Wei Ji},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Procedia CIRP},
   volume = {72},
   pages = {1404--1409},
   type = {Conference Paper},
   month = {May},
   year = {2018},
   doi = {https://doi.org/10.1016/j.procir.2018.03.164},
   issn = {2212-8271},
   keywords = {Cutting Tool Life Cycle; Total Cost of Ownership; Manufacturing; Data Integration},
   language = {English},
   cr-category = {H.3.0 Information Storage and Retrieval General,     H.4.0 Information Systems Applications General,     J.1 Administration Data Processing},
   ee = {http://www.sciencedirect.com/science/article/pii/S2212827118303226},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-23&engl=1}
}
@inproceedings {INPROC-2018-22,
   author = {Rachaa Ghabri and Pascal Hirmer and Bernhard Mitschang},
   title = {{A Hybrid Approach to Implement Data Driven Optimization into Production Environments}},
   booktitle = {Proceedings of the 21st International Conference on Business Information Systems (BIS)},
   editor = {Witold Abramowicz and Adrian Paschke},
   publisher = {Springer Berlin Heidelberg},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Business Information Processing},
   volume = {320},
   pages = {3--14},
   type = {Conference Paper},
   month = {July},
   year = {2018},
   isbn = {978-3-319-93930-8},
   doi = {https://doi.org/10.1007/978-3-319-93931-5},
   issn = {1865-1356},
   keywords = {Data driven optimization; Production environment; Top-down; Bottom-up},
   language = {English},
   cr-category = {H.0 Information Systems General},
   ee = {https://link.springer.com/chapter/10.1007/978-3-319-93931-5_1},
   contact = {rachaa.ghabri@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-22&engl=1}
}
@inproceedings {INPROC-2018-19,
   author = {Christoph Stach and Frank Steimle and Bernhard Mitschang},
   title = {{THOR - Ein Datenschutzkonzept f{\"u}r die Industrie 4.0: Datenschutzsysteme f{\"u}r die Smart Factory zur Realisierung der DSGVO}},
   booktitle = {Informatik 2018: Zukunft der Arbeit - Zukunft der Informatik, Tagungsband der 48. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI), 26.09. - 27.09.2018, Berlin.},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics (LNI)},
   pages = {1--12},
   type = {Workshop Paper},
   month = {September},
   year = {2018},
   keywords = {Datenschutz; Internet der Dinge; Sensoren; Industrie 4.0; Datenstr{\"o}me; Smart Devices},
   language = {German},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Der Aufschwung des Internets der Dinge (IoT) sorgt f{\"u}r eine voranschreitende Digitalisierung. Sensoren in Alltagsgegenst{\"a}nden erfassen unterschiedliche Aspekte des t{\"a}glichen Lebens. Durch eine Vernetzung dieser Ger{\"a}te, lassen sich die Daten miteinander kombinieren und daraus neues Wissen generieren. In der Industrie 4.0 werden beispielsweise die am Produktionsprozess beteiligten cyber-physischen Systeme dazu genutzt, um mit den von ihnen erfassten Daten Produktionsprozesse zu optimieren. Da auch der Mensch ein relevanter Bestandteil des Produktionsprozesses ist, werden z.B. mittels Smart Watches auch {\"u}ber diesen viele Daten erfasst. Nicht erst mit der Einf{\"u}hrung der neuen Datenschutzgrundverordnung (DSGVO) sind hierbei allerdings Datenschutzanforderungen zu beachten: Es m{\"u}ssen nicht nur die privaten Daten der Nutzer gesch{\"u}tzt werden, sondern es muss auch sichergestellt werden, dass die Datenverarbeitung und -analyse dadurch so wenig wie m{\"o}glich behindert werden. Wir stellen hierf{\"u}r ein neuartiges Datenschutzkonzept f{\"u}r die Industrie 4.0 (THOR) vor, mit dem Kompromisse zwischen erforderlichem Datenschutz und gew{\"u}nschter Datenqualit{\"a}t gefunden werden k{\"o}nnen, der der DSGVO gen{\"u}gt.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-19&engl=1}
}
@inproceedings {INPROC-2018-18,
   author = {Ana Cristina Franco da Silva and Pascal Hirmer and Uwe Breitenb{\"u}cher and Oliver Kopp and Bernhard Mitschang},
   title = {{TDLIoT: A Topic Description Language for the Internet of Things}},
   booktitle = {ICWE 2018: Web Engineering},
   editor = {Tommi Mikkonen and Ralf Klamma and Juan Hern{\'a}ndez},
   publisher = {Springer Berlin Heidelberg},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Computer Science (LNCS)},
   volume = {10845},
   pages = {333--348},
   type = {Conference Paper},
   month = {May},
   year = {2018},
   doi = {10.1007/978-3-319-91662-0_27},
   keywords = {Internet of Things; Publish-subscribe; Description Language},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems,     D.2.12 Software Engineering Interoperability},
   ee = {https://link.springer.com/chapter/10.1007/978-3-319-91662-0_27},
   contact = {franco-da-silva@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-18&engl=1}
}
@inproceedings {INPROC-2018-17,
   author = {Marc H{\"u}ffmeyer and Pascal Hirmer and Bernhard Mitschang and Ulf Schreier and Matthias Wieland},
   title = {{Situation-Aware Access Control for Industrie 4.0}},
   booktitle = {ICISSP 2017: Information Systems Security and Privacy},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Communications in Computer and Information Science},
   volume = {867},
   pages = {59--83},
   type = {Conference Paper},
   month = {June},
   year = {2018},
   keywords = {Authorization; Attribute based access control; Situation-awareness; REST; Internet of Things},
   language = {English},
   cr-category = {E.0 Data General},
   ee = {https://link.springer.com/chapter/10.1007/978-3-319-93354-2_4},
   contact = {Pascal.Hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-17&engl=1}
}
@inproceedings {INPROC-2018-15,
   author = {Christoph Stach and Sascha Alpers and Stefanie Betz and Frank D{\"u}rr and Andreas Fritsch and Kai Mindermann and Saravana Murthy Palanisamy and Gunther Schiefer and Manuela Wagner and Bernhard Mitschang and Andreas Oberweis and Stefan Wagner},
   title = {{The AVARE PATRON: A Holistic Privacy Approach for the Internet of Things}},
   booktitle = {Proceedings of the 15th International Conference on Security and Cryptography (SECRYPT '18)},
   publisher = {INSTICC Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {July},
   year = {2018},
   keywords = {Privacy; IoT Apps; Smart Things; Stream Processing; Privacy Preferences Elicitation \& Veri\&\#64257; cation},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Software Technology, Software Engineering;     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
   abstract = {Applications for the Internet of Things are becoming increasingly popular. Due to the large amount of available context data, such applications can be used effectively in many domains. By interlinking these data and analyzing them, it is possible to gather a lot of knowledge about a user. Therefore, these applications pose a threat to privacy. In this paper, we illustrate this threat by looking at a real-world application scenario. Current state of the art focuses on privacy mechanisms either for Smart Things or for big data processing systems. However, our studies show that for a comprehensive privacy protection a holistic view on these applications is required. Therefore, we describe how to combine two promising privacy approaches from both categories, namely AVARE and PATRON. Evaluation results confirm the thereby achieved synergy effects.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-15&engl=1}
}
@inproceedings {INPROC-2018-14,
   author = {Corinna Giebler and Christoph Stach and Holger Schwarz and Bernhard Mitschang},
   title = {{BRAID - A Hybrid Processing Architecture for Big Data}},
   booktitle = {Proceedings of the 7th International Conference on Data Science, Technology and Applications (DATA 2018)},
   publisher = {INSTICC Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {July},
   year = {2018},
   keywords = {Big Data; IoT; Batch Processing; Stream Processing; Lambda Architecture; Kappa Architecture},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     H.2.4 Database Management Systems,     H.2.8 Database Applications},
   contact = {Senden Sie eine e-Mail an Corinna.Giebler@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The Internet of Things is applied in many domains and collects vast amounts of data. This data provides access to a lot of knowledge when analyzed comprehensively. However, advanced analysis techniques such as predictive or prescriptive analytics require access to both, history data, i.e., long-term persisted data, and real-time data as well as a joint view on both types of data. State-of-the-art hybrid processing architectures for big data - namely, the Lambda and the Kappa Architecture - support the processing of history data and real-time data. However, they lack of a tight coupling of the two processing modes. That is, the user has to do a lot of work manually in order to enable a comprehensive analysis of the data. For instance, the user has to combine the results of both processing modes or apply knowledge from one processing mode to the other. Therefore, we introduce a novel hybrid processing architecture for big data, called BRAID. BRAID intertwines the processing of history data and real-time data by adding communication channels between the batch engine and the stream engine. This enables to carry out comprehensive analyses automatically at a reasonable overhead.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-14&engl=1}
}
@inproceedings {INPROC-2018-12,
   author = {Oliver Kopp and Uwe Breitenb{\"u}cher and Tamara M{\"u}ller},
   title = {{CloudRef - Towards Collaborative Reference Management in the Cloud}},
   booktitle = {Proceedings of the 10th Central European Workshop on Services and their Composition (ZEUS 2018)},
   editor = {Nico Herzberg and Christoph Hochreiner and Oliver Kopp and J{\"o}rg Lenhard},
   publisher = {CEUR-WS.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {CEUR Workshop Proceedings},
   volume = {2072},
   pages = {63--68},
   type = {Workshop Paper},
   month = {April},
   year = {2018},
   issn = {1613-0073},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {http://ceur-ws.org/Vol-2072/,     http://ceur-ws.org/Vol-2072/paper10.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-12&engl=1}
}
@inproceedings {INPROC-2018-11,
   author = {Oliver Kopp and Anita Armbruster and Olaf Zimmermann},
   title = {{Markdown Architectural Decision Records: Format and Tool Support}},
   booktitle = {Proceedings of the 10th Central European Workshop on Services and their Composition (ZEUS 2018)},
   editor = {Nico Herzberg and Christoph Hochreiner and Oliver Kopp and J{\"o}rg Lenhard},
   publisher = {CEUR-WS.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {CEUR Workshop Proceedings},
   volume = {2072},
   pages = {55--62},
   type = {Conference Paper},
   month = {April},
   year = {2018},
   issn = {1613-0073},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {http://ceur-ws.org/Vol-2072/,     http://ceur-ws.org/Vol-2072/paper9.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-11&engl=1}
}
@inproceedings {INPROC-2018-10,
   author = {Jan K{\"o}nigsberger and Bernhard Mitschang},
   title = {{R2SMA - A Middleware Architecture to Access Legacy Enterprise Web Services using Lightweight REST APIs}},
   booktitle = {Proceedings of the 20th International Conference on Enterprise Information Systems},
   editor = {Slimane Hammoudi and Michal Smialek and Olivier Camp and Joaquim Filipe},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {704--711},
   type = {Conference Paper},
   month = {March},
   year = {2018},
   isbn = {978-989-758-298-1},
   keywords = {REST; API; SOAP; Web Service; SOA; Enterprise SOA; Architecture},
   language = {English},
   cr-category = {H.5.4 Hypertext/Hypermedia,     H.3.5 Online Information Services},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-10&engl=1}
}
@inproceedings {INPROC-2018-05,
   author = {Christoph Stach and Bernhard Mitschang},
   title = {{CURATOR - A Secure Shared Object Store: Design, Implementation, and Evaluation of a Manageable, Secure, and Performant Data Exchange Mechanism for Smart Devices}},
   booktitle = {Proceedings of the 33rd ACM/SIGAPP Symposium On Applied Computing (DTTA)},
   publisher = {ACM Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {April},
   year = {2018},
   keywords = {data exchange; smart devices; shared object store; security},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays, smart devices have become incredible popular - literally everybody has one. Due to an enormous quantity of versatile apps, these devices positively affect almost every aspect of their users' lives. E.g., there are apps collecting and monitoring health data from a certain domain such as diabetes-related or respiration-related data. However, they cannot display their whole potential since they have only access to their own data and cannot combine it with data from other apps, e.g., in order to create a comprehensive electronic health record. On that account, we introduce a seCURe shAred objecT stORe called CURATOR. In CURATOR apps cannot only manage their own data in an easy and performant way, but they can also share it with other apps. Since some of the data is confidential, CURATOR has several security features, including authentication, fine-grained access control, and encryption. In this paper, we discuss CURATOR's design and implementation and evaluate its performance.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-05&engl=1}
}
@inproceedings {INPROC-2018-04,
   author = {Christoph Stach and Frank D{\"u}rr and Kai Mindermann and Saravana Murthy Palanisamy and Stefan Wagner},
   title = {{How a Pattern-based Privacy System Contributes to Improve Context Recognition}},
   booktitle = {Proceedings of the 2018 IEEE International Conference on Pervasive Computing and Communications Workshops (CoMoRea)},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Workshop Paper},
   month = {March},
   year = {2018},
   keywords = {privacy; access control; pattern concealing; stream processing; complex event processing; databases},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Software Technology, Software Engineering;     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
   abstract = {As Smart Devices have access to a lot of user-preferential data, they come in handy in any situation. Although such data - as well as the knowledge which can be derived from it - is highly beneficial as apps are able to adapt their services appropriate to the respective context, it also poses a privacy threat. Thus, a lot of research work is done regarding privacy. Yet, all approaches obfuscate certain attributes which has a negative impact on context recognition and thus service quality. Therefore, we introduce a novel access control mechanism called PATRON. The basic idea is to control access to information patterns. For instance, a person suffering from diabetes might not want to reveal his or her unhealthy eating habit, which can be derived from the pattern ``rising blood sugar level'' -$>$ ``adding bread units''. Such a pattern which must not be discoverable by some parties (e.g., insurance companies) is called private pattern whereas a pattern which improves an app's service quality is labeled as public pattern. PATRON employs different techniques to conceal private patterns and, in case of available alternatives, selects the one with the least negative impact on service quality, such that the recognition of public patterns is supported as good as possible.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-04&engl=1}
}
@inproceedings {INPROC-2018-03,
   author = {Christoph Stach and Frank Steimle and Bernhard Mitschang},
   title = {{The Privacy Management Platform: An Enabler for Device Interoperability and Information Security in mHealth Applications}},
   booktitle = {Proceedings of the 11th International Conference on Health Informatics (HEALTHINF 2018)},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--12},
   type = {Conference Paper},
   month = {January},
   year = {2018},
   keywords = {mHealth; Device Interoperability; Information Security; COPD; Privacy Management Platform},
   language = {English},
   cr-category = {H.5.0 Information Interfaces and Presentation General,     K.6.5 Security and Protection,     K.8 Personal Computing},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Chronic diseases are on the rise. Afflicted patients require persistent therapy and periodic screenings. This causes high treatment costs and overburdened physicians. Innovative approaches that enable patients to perform treatment methods on their own are badly needed. Telemedical approaches with the aid of modern Smartphones connected to medical devices (the so-called mHealth) can be the answer. However, mHealth apps face two key challenges, namely device interoperability and information security. In this paper, we describe how the Privacy Management Platform (PMP) and its extendable Resources can contribute to these challenges. Therefore, we analyze a real-world mHealth app and derive generic functional units, each realizing a certain task recurring frequently within mHealth apps, e.g., metering, data storage, or data transmission. For each functional unit we provide a PMP Resource, enabling both, device interoperability and information security. Finally, we revise the analyzed mHealth app using the Resources in order to evaluate our approach.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-03&engl=1}
}
@inproceedings {INPROC-2018-02,
   author = {Christoph Stach},
   title = {{Big Brother is Smart Watching You: Privacy Concerns about Health and Fitness Applications}},
   booktitle = {Proceedings of the 4th International Conference on Information Systems Security and Privacy (ICISSP 2018)},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--11},
   type = {Conference Paper},
   month = {January},
   year = {2018},
   keywords = {Smartbands; Health and Fitness Applications; Privacy Concerns; Privacy Management Platform},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection,     K.8 Personal Computing},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Health and fitness applications for mobile devices are becoming more and more popular. Due to novel wearable metering devices, the so-called Smartbands, these applications are able to capture both health data (e.g., the heart rate) as well as personal information (e.g., location data) and create a quantified self for their users. However, many of these applications violate the user's privacy and misuse the collected data. It becomes apparent that this threat is inherent in the privacy systems implemented in mobile platforms. Therefore, we apply the Privacy Policy Model (PPM) a fine-grained and modular expandable permission model to deals with this problem. We implement our adapted model in a prototype based on the Privacy Management Platform (PMP). Subsequently, we evaluate our model with the help the prototype and demonstrate its applicability for any application using Smartbands for its data acquisition.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-02&engl=1}
}
@inproceedings {INPROC-2018-01,
   author = {Christoph Stach and Bernhard Mitschang},
   title = {{ACCESSORS: A Data-Centric Permission Model for the Internet of Things}},
   booktitle = {Proceedings of the 4th International Conference on Information Systems Security and Privacy (ICISSP 2018).},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--11},
   type = {Conference Paper},
   month = {January},
   year = {2018},
   keywords = {Permission Model; Data-Centric; Derivation Transparent; Fine-Grained; Context-Sensitive; IoT},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The Internet of Things (IoT) is gaining more and more relevance. Due to innovative IoT devices equipped with novel sensors, new application domains come up continuously. These domains include Smart Homes, Smart Health, and Smart Cars among others. As the devices not only collect a lot of data about the user, but also share this information with each other, privacy is a key issue for IoT applications. However, traditional privacy systems cannot be applied to the IoT directly due to different requirements towards the underlying permission models. Therefore, we analyze existing permission models regarding their applicability in the IoT domain. Based on this analysis, we come up with a novel permission model, implement it in a privacy system, and assess its utility.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2018-01&engl=1}
}
@inproceedings {INPROC-2017-70,
   author = {Jan K{\"o}nigsberger and Bernhard Mitschang},
   title = {{Business Objects plus (BO+): An Approach to Enhance Service Reuse and Integration in Cross-Domain SOA Compounds}},
   booktitle = {Proceedings of the 2017 IEEE International Conference on Information Reuse and Integration},
   editor = {Chengcui Zhang and Balaji Palanisamy and Latifur Khan and Sahra Sedigh Sarvestani},
   address = {Los Alamitos, Washington, Tokyo},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {49--58},
   type = {Conference Paper},
   month = {August},
   year = {2017},
   doi = {10.1109/IRI.2017.28},
   isbn = {978-1-5386-1562-1},
   keywords = {SOA, data model, abstraction, service interface, business objects},
   language = {German},
   cr-category = {E.2 Data Storage Representations,     H.3.5 Online Information Services},
   ee = {http://ieeexplore.ieee.org/document/8102918/},
   contact = {Jan K{\"o}nigsberger jan.koenigsberger@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-70&engl=1}
}
@inproceedings {INPROC-2017-66,
   author = {Andreas Bader and Oliver Kopp},
   title = {{Towards DBCloudBench - A Scenario-Based Database Benchmarking Framework}},
   booktitle = {Proceedings of the 11th Advanced Summer School on Service Oriented Computing},
   editor = {Johanna Barzen and Rania Khalaf and Frank Leymann and Bernhard Mitschang},
   publisher = {IBM Research Report},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {IBM Research Report},
   volume = {RC25670 (WAT1710-015)},
   pages = {53--5456},
   type = {Conference Paper},
   month = {October},
   year = {2017},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2017-66/INPROC-2017-66.pdf,     http://domino.watson.ibm.com/library/CyberDig.nsf/1e4115aea78b6e7c85256b360066f0d4/b7ed36faf73949a4852581e7006b2a55!OpenDocument},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Many benchmarks can be used for measuring performance of different types of databases. To automate the process of benchmark- ing databases, this paper outlines DBCloudBench. It can be used to automatically setup a scenario and perform a benchmark run using a standards-based approach. The databases and benchmarks are stored in {\^a}€ścloud services archives{\^a}€ť allowing them to be reused and combined as necessary. Each benchmark is accompanied with an adapter for running the benchmark on certain database systems while using DBCloudBench.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-66&engl=1}
}
@inproceedings {INPROC-2017-49,
   author = {Eva Hoos and Matthias Wieland and Bernhard Mitschang},
   title = {{Analysis Method for Conceptual Context Modeling Applied in Production Environments}},
   booktitle = {Proceedings of 20th International Conference on Business Information Systems (BIS)},
   publisher = {Springer International Publishing},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {313--325},
   type = {Conference Paper},
   month = {May},
   year = {2017},
   keywords = {Context-awareness; production environments; Industry 4.0},
   language = {English},
   cr-category = {J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-49&engl=1}
}
@inproceedings {INPROC-2017-48,
   author = {Eva Hoos and Pascal Hirmer and Bernhard Mitschang},
   title = {{Context-Aware Decision Information Packages: An Approach to Human-Centric Smart Factories}},
   booktitle = {Proceedings of the 21st European Conference on Advances in Databases and Information Systems (ADBIS)},
   publisher = {Springer International Publishing AG 2017},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {42--56},
   type = {Conference Paper},
   month = {August},
   year = {2017},
   keywords = {Industry 4.0; Context-awareness; Data Provisioning; Smart Factory},
   language = {German},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-48&engl=1}
}
@inproceedings {INPROC-2017-41,
   author = {Matthias Wieland and Frank Steimle and Bernhard Mitschang and Dominik Lucke and Peter Einberger and Daniel Schel and Michael Luckert and Thomas Bauernhansl},
   title = {{Rule-Based Integration of Smart Services Using the Manufacturing Service Bus}},
   booktitle = {Proceedings of 14th IEEE International Conference on Ubiquitous Intelligence and Computing (UIC2017)},
   address = {Fremont, USA},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {August},
   year = {2017},
   doi = {10.1109/UIC-ATC.2017.8397529},
   keywords = {Rules; Integration; Manufacturing; Smart Factory; Industrie 4.0; Manufacturing Service Bus},
   language = {English},
   cr-category = {H.4.0 Information Systems Applications General,     I.2.1 Applications and Expert Systems},
   ee = {https://ieeexplore.ieee.org/document/8397529/},
   contact = {Senden Sie eine E-Mail an Frank.Steimle@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Factories have to adapt permanently to changing situations in order to stay competitive. Premise to achieve this objective is up-to-date information on all levels of a factory and during the product life cycle, so that men and machine can optimize their activities according to their tasks. One approach to implement this economically is the massive application of sensors and information and communication technologies (ICT) leading to a Smart Factory. This process and related applications are summarized under the term of the forth industrial revolution (Industrie 4.0). It demands a flexible and easy-to-use integration of assets on the shop floor with ICT systems. The contribution of this paper is the MIALinx system that enables all these steps. The steps range from the integration to the sensing and analyzing of the sensor data to the execution of required actions. Furthermore, MIALinx provides an abstract rule based approach for users to model the behavior of the system. The presented system is based on concepts and technologies of the Internet of Things and service-oriented middleware. The main users targeted with our system are small and medium-sized enterprises that do not have the expertise or the investment possibilities to invest in completely new Industrie 4.0 systems but rather use their existing production assets and enrich them to achieve Industrie 4.0 capability.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-41&engl=1}
}
@inproceedings {INPROC-2017-40,
   author = {Eva Hoos and Pascal Hirmer and Bernhard Mitschang},
   title = {{Improving Problem Resolving on the Shop Floor by Context-Aware Decision Information Packages}},
   booktitle = {Proceedings of the CAiSE 2017 Forum},
   editor = {Xavier Franch and Jolita Ralyt{\'e}},
   address = {Essen},
   publisher = {CEUR Workshop Proceedings},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {121--128},
   type = {Workshop Paper},
   month = {June},
   year = {2017},
   keywords = {Industry 4.0; Context-Awareness; Engineering},
   language = {English},
   cr-category = {J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-40&engl=1}
}
@inproceedings {INPROC-2017-38,
   author = {Christian Weber and Jan K{\"o}nigsberger and Laura Kassner and Bernhard Mitschang},
   title = {{M2DDM – A Maturity Model for Data-Driven Manufacturing}},
   booktitle = {Manufacturing Systems 4.0 – Proceedings of the 50th CIRP Conference on Manufacturing Systems (CIRP CMS); Taichung, Taiwan, May 3-5, 2017},
   editor = {Mitchell M. Tseng and Hung-Yin Tsai and Yue Wang},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Procedia CIRP},
   volume = {63},
   pages = {173--178},
   type = {Conference Paper},
   month = {July},
   year = {2017},
   doi = {https://doi.org/10.1016/j.procir.2017.03.309},
   issn = {2212-8271},
   keywords = {Maturity Model; Industrie 4.0; Industrial Internet; Reference Architectures; Digital Twin; Edge Analytics},
   language = {English},
   cr-category = {H.1.0 Information Systems Models and Principles General,     H.4.0 Information Systems Applications General},
   ee = {http://www.sciencedirect.com/science/article/pii/S2212827117304973},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-38&engl=1}
}
@inproceedings {INPROC-2017-32,
   author = {Christoph Stach and Frank D{\"u}rr and Kai Mindermann and Saravana Murthy Palanisamy and Muhammad Adnan Tariq and Bernhard Mitschang and Stefan Wagner},
   title = {{PATRON - Datenschutz in Datenstromverarbeitungssystemen}},
   booktitle = {Informatik 2017: Digitale Kulturen, Tagungsband der 47. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI), 25.09. - 29.09.2017, Technische Universit{\"a}t Chemnitz},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNI},
   pages = {1--12},
   type = {Workshop Paper},
   month = {September},
   year = {2017},
   keywords = {Datenschutz; Zugriffskontrolle; Datenstr{\"o}me; Internet der Dinge; Privatheit; Sensoren},
   language = {German},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Software Technology, Software Engineering;     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
   abstract = {Angetrieben durch die stetig voranschreitende Digitalisierung gewinnt das Internet der Dinge (engl. IoT) immer mehr an Bedeutung. Im IoT werden technische Ger{\"a}te mit unterschiedlichen Sensoren ausgestattet und miteinander vernetzt. Dadurch werden neuartige Anwendungen beispielsweise im Bereich E-Health erm{\"o}glicht, in denen Sensordaten miteinander kombiniert und so in h{\"o}herwertige Informationen umgewandelt werden. Die von diesen Anwendungen abgeleiteten Informationen verraten viel {\"u}ber den Nutzer und m{\"u}ssen daher besonders gesch{\"u}tzt werden. H{\"a}ufig hat der Nutzer allerdings keine Kontrolle {\"u}ber die Verarbeitung seiner Daten, ganz davon zu schweigen, dass er das Ausma{\ss} und die Art der daraus ableitbaren Informationen nicht ermessen kann. In diesem Artikel stellen wir daher einen neuartigen Kontrollmechanismus vor, der private Informationen im IoT sch{\"u}tzt. Anstelle von abstrakten Datenschutzregeln f{\"u}r einzelne Sensoren definiert der Nutzer Muster, die es zu sch{\"u}tzen gilt. Ein Muster kann beispielsweise eine Kombination aus Messwerten sein, die auf eine bestimmte Krankheit schlie{\ss}en lassen. Der Nutzer definiert die zu verheimlichenden Informationen nat{\"u}rlichsprachlich, und ein Dom{\"a}nenexperte setzt diese in formale Regeln um. Sind diese Regeln zu restriktiv, so kann die Anwendung ihre angedachte Funktionalit{\"a}t nicht erbringen. Daher muss bez{\"u}glich der Servicequalit{\"a}t ein Kompromiss zwischen gew{\"u}nschter Privatheit und ben{\"o}tigter Funktionalit{\"a}t gefunden werden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-32&engl=1}
}
@inproceedings {INPROC-2017-28,
   author = {Ana Cristina Franco da Silva and Uwe Breitenb{\"u}cher and Pascal Hirmer and K{\'a}lm{\'a}n K{\'e}pes and Oliver Kopp and Frank Leymann and Bernhard Mitschang and Ronald Steinke},
   title = {{Internet of Things Out of the Box: Using TOSCA for Automating the Deployment of IoT Environments}},
   booktitle = {Proceedings of the 7th International Conference on Cloud Computing and Services Science (CLOSER)},
   editor = {Donald Ferguson and V{\'\i}ctor M{\'e}ndez Mu{\~n}oz and Jorge Cardoso and Markus Helfert and Claus Pahl},
   publisher = {SciTePress Digital Library},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {ScitePress},
   volume = {1},
   pages = {358--367},
   type = {Conference Paper},
   month = {June},
   year = {2017},
   isbn = {978-989-758-243-1},
   doi = {10.5220/0006243303580367},
   keywords = {Internet of Things; TOSCA; Application Deployment; Device Software},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems,     D.2.12 Software Engineering Interoperability},
   ee = {http://scitepress.org/DigitalLibrary/PublicationsDetail.aspx?ID=AuNrRtS4cNc=&t=1},
   contact = {franco-da-silva@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-28&engl=1}
}
@inproceedings {INPROC-2017-27,
   author = {C. Timurhan Sungur and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann and Andreas Wei{\ss}},
   title = {{Identifying Relevant Resources and Relevant Capabilities of Informal Processes}},
   booktitle = {Proceedings of the 19th International Conference on Enterprise Information Systems (ICEIS 2017)},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {295--307},
   type = {Conference Paper},
   month = {April},
   year = {2017},
   keywords = {Informal Processes; Unstructured Processes; Resource Discovery; Capability Discovery; Relevant Resources; Relevant Capabilities},
   language = {English},
   cr-category = {H.4.1 Office Automation,     H.3.3 Information Search and Retrieval,     H.3.4 Information Storage and Retrieval Systems and Software,     H.5.3 Group and Organization Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-27&engl=1}
}
@inproceedings {INPROC-2017-26,
   author = {Corinna Giebler and Christoph Stach},
   title = {{Datenschutzmechanismen f{\"u}r Gesundheitsspiele am Beispiel von Secure Candy Castle}},
   booktitle = {Tagungsband der 15. GI-Fachtagung Datenbanksysteme f{\"u}r Business, Technologie und Web},
   editor = {Bernhard Mitschang and Daniela Nicklas and Frank Leymann and Harald Sch{\"o}ning and Melanie Herschel and Jens Teubner and Theo H{\"a}rder and Oliver Kopp and Matthias Wieland},
   publisher = {GI},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics (LNI)},
   volume = {265},
   pages = {311--320},
   type = {Conference Paper},
   month = {March},
   year = {2017},
   isbn = {978-3-88579-659-6},
   keywords = {mHealth-Apps; Datensicherheit; Datenschutz; Datenintegration; Interoperabilit{\"a}t},
   language = {German},
   cr-category = {J.3 Life and Medical Sciences,     K.4.1 Computers and Society Public Policy Issues},
   ee = {http://btw2017.informatik.uni-stuttgart.de/?pageId=Proceedings&language=de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Smartphones sind mittlerweile ein fester Bestandteil des modernen Lebens. Sie erzeugen, speichern und verarbeiten eine Vielzahl an privaten Daten. Auch im Gesundheitssektor werden sie zunehmend eingesetzt; die dabei entstehenden Daten sind besonders sch{\"u}tzenswert. In dieser Arbeit werden daher Konzepte eingef{\"u}hrt, die Nutzern die Kontrolle {\"u}ber ihre Gesundheitsdaten geben. Zu diesem Zweck wird Secure Candy Castle, ein Spiel f{\"u}r Kinder mit einer Diabeteserkrankung, das mit einem Berechtigungsmanagementsystem verbunden ist, vorgestellt. Der Nutzer kann den Funktionsumfang des Spiels einschr{\"a}nken, wodurch die App weniger Berechtigungen erh{\"a}lt. Zus{\"a}tzlich werden f{\"u}r SCC Komponenten entwickelt, die die Interoperabilit{\"a}t von Smartphones mit medizinischen Messger{\"a}ten verbessert. Die Evaluation zeigt, dass mit SCC alle aktuellen Probleme von Gesundheits-Apps adressiert werden. Die Konzepte sind generisch und lassen sich auf beliebige andere Gesundheits-Apps anwenden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-26&engl=1}
}
@inproceedings {INPROC-2017-25,
   author = {Karoline Saatkamp and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann},
   title = {{Topology Splitting and Matching for Multi-Cloud Deployments}},
   booktitle = {Proceedings of the 7th International Conference on Cloud Computing and Services Science (CLOSER 2017)},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {247--258},
   type = {Conference Paper},
   month = {April},
   year = {2017},
   isbn = {978-989-758-243-1},
   keywords = {Application Deployment; Distribution; Splitting; Cloud Computing; TOSCA},
   language = {English},
   cr-category = {G.0 Mathematics of Computing General,     H.0 Information Systems General},
   ee = {http://closer.scitevents.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {For automating the deployment of applications in cloud environments, a variety of deployment automation technologies have been developed in recent years. These technologies enable specifying the desired deployment in the form of deployment models, which can be automatically executed. However, changing internal or external conditions often lead to strategical decisions that must be reflected in all deployment models of a company’s IT. Unfortunately, while creating such deployment models is difficult, adapting them is even harder as typically a variety of technologies must be replaced. In this paper, we present the Split and Match Method that enables splitting a deployment model following a manually specified distribution on the business layer. The method also enables automatically deploying the resulting model without the need for a manual intervention and, thus, significantly eases reflecting strategical decisions on the technical deployment layer. We present a formalization and algorithms to automate the steps of the method. Moreover, we validate the practical feasibility of the presented concepts by a prototype based on the TOSCA standard and the OpenTOSCA ecosystem.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-25&engl=1}
}
@inproceedings {INPROC-2017-21,
   author = {Tim Waizenegger and Frank Wagner and Cataldo Mega},
   title = {{SDOS: Using Trusted Platform Modules for Secure Cryptographic Deletion in the Swift Object Store}},
   booktitle = {Proc. 20th International Conference on Extending Database Technology (EDBT), March 21-24, 2017 - Venice, Italy},
   publisher = {OpenProceedings.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {550--553},
   type = {Demonstration},
   month = {January},
   year = {2017},
   isbn = {978-3-89318-073-8},
   keywords = {secure data deletion; cryptographic deletion; data erasure; records management; retention management; key management; data shredding; trusted platform module; TPM},
   language = {German},
   cr-category = {E.3 Data Encryption},
   ee = {http://openproceedings.org/2017/conf/edbt/paper-408.pdf},
   contact = {tim.waizenegger@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-21&engl=1}
}
@inproceedings {INPROC-2017-20,
   author = {Tim Waizenegger},
   title = {{Secure Cryptographic Deletion in the Swift Object Store}},
   booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2017), 17. Fachtagung des GI-Fachbereichs Datenbanken und Informationssysteme (DBIS), 6.-10. M{\"a}rz 2017, Stuttgart, Germany, Proceedings},
   publisher = {GI},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {625--628},
   type = {Conference Paper},
   month = {January},
   year = {2017},
   isbn = {978-3-88579-659-6},
   language = {English},
   cr-category = {E.3 Data Encryption},
   ee = {http://btw2017.informatik.uni-stuttgart.de/slidesandpapers/I-18-29/paper_web.pdf},
   contact = {tim.waizenegger@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-20&engl=1}
}
@inproceedings {INPROC-2017-19,
   author = {Tim Waizenegger},
   title = {{BTW 2017 Data Science Challenge (SDSC17)}},
   booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2017), 17. Fachtagung des GI-Fachbereichs Datenbanken und Informationssysteme (DBIS), 6.-10. M{\"a}rz 2017, Stuttgart, Germany, Workshopband},
   publisher = {GI},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {405--406},
   type = {Conference Paper},
   month = {January},
   year = {2017},
   isbn = {978-3-88579-660-2},
   language = {German},
   cr-category = {A.0 General Literature, General},
   ee = {http://dblp.uni-trier.de/rec/bib/conf/btw/Waizenegger17a,     https://www.gi.de/service/publikationen/lni/gi-edition-proceedings-2017/gi-edition-lecture-notes-in-informatics-lni-p-266.html},
   contact = {tim.waizenegger@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Im Rahmen der Data Science Challenge haben Studierende und Doktoranden die M{\"o}glichkeit, einen eigenen Ansatz zur Cloud-basierten Datenanalyse zu entwickeln und damit gegen andere Teilnehmer anzutreten. Auf der BTW2017 in Stuttgart pr{\"a}sentieren die Teilnehmer Ihre Ergebnisse die von einer Fachjury aus Forschung und Industrie bewertet werden. Die Gewinner, sowie die N{\"a}chstplatzierten, werden mit einem Preisgeld honoriert.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-19&engl=1}
}
@inproceedings {INPROC-2017-18,
   author = {Cornelia Kiefer},
   title = {{Die Gratwanderung zwischen qualitativ hochwertigen und einfach zu erstellenden dom{\"a}nenspezifischen Textanalysen}},
   booktitle = {GI-Edition Lecture Notes in Informatics Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2017) Workshopband},
   editor = {B. Mitschang et al.},
   address = {Bonn},
   publisher = {Gesellschaft f{\"u}r Informatik},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {99--104},
   type = {Workshop Paper},
   month = {March},
   year = {2017},
   keywords = {Textanalyse, Datenqualit{\"a}t, Analysequalit{\"a}t, {\"u}berwachte maschinelle Lernverfahren, Textanalyse in den Geisteswissenschaften},
   language = {German},
   cr-category = {H.3 Information Storage and Retrieval},
   ee = {http://btw2017.informatik.uni-stuttgart.de/pro/P-266-BTW2017-Workshopband.pdf,     http://btw2017.informatik.uni-stuttgart.de/slidesandpapers/E1-12/paper_web.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die Textanalyse ist zu einem entscheidenden Werkzeug in verschiedenen Dom{\"a}nen wie den Geisteswissenschaften, Naturwissenschaften sowie auch in der Industrie geworden. Eine der gr{\"o}{\ss}ten Herausforderungen bei dom{\"a}nenspezifischen Textanalyseprojekten besteht darin, das Wissen aus den Bereichen IT und Text Mining mit dem Wissen aus der Dom{\"a}ne zusammenzubringen. Viele Textanalysetoolkits werden deshalb speziell f{\"u}r den Gebrauch durch Dom{\"a}nenexperten ohne oder mit wenig IT und Textanalysewissen vereinfacht. In diesem Beitrag diskutieren wir, inwiefern diese Vereinfachungen zu Qualit{\"a}tsproblemen bei der Analyse von unsauberen Daten f{\"u}hren k{\"o}nnen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-18&engl=1}
}
@inproceedings {INPROC-2017-13,
   author = {Marc H{\"u}ffmeyer and Pascal Hirmer and Bernhard Mitschang and Ulf Schreier and Matthias Wieland},
   title = {{SitAC – A System for Situation-aware Access Control - Controlling Access to Sensor Data}},
   booktitle = {Proceedings of the 3rd International Conference on Information Systems Security and Privacy},
   editor = {Paolo Mori and Steven Furnell and Olivier Camp},
   address = {Porto, Portugal},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {ScitePress},
   volume = {1},
   pages = {113--125},
   type = {Conference Paper},
   month = {March},
   year = {2017},
   isbn = {978-989-758-209-7},
   keywords = {Authorization; Attribute based Access Control; Situation-awareness; REST; Internet of Things},
   language = {English},
   cr-category = {J.6 Computer-Aided Engineering,     H.3.1 Content Analysis and Indexing},
   ee = {http://www.scitepress.org/DigitalLibrary/PublicationsDetail.aspx?ID=PZW1ep7OUUk%3d&t=1},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-13&engl=1}
}
@inproceedings {INPROC-2017-12,
   author = {Christian Endres and Uwe Breitenb{\"u}cher and Michael Falkenthal and Oliver Kopp and Frank Leymann and Johannes Wettinger},
   title = {{Declarative vs. Imperative: Two Modeling Patterns for the Automated Deployment of Applications}},
   booktitle = {Proceedings of the 9th International Conference on Pervasive Patterns and Applications (PATTERNS)},
   publisher = {Xpert Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {22--27},
   type = {Conference Paper},
   month = {February},
   year = {2017},
   isbn = {978-1-61208-534-0},
   keywords = {Modeling Patterns; Application Deployment and Management; Automation; Cloud Computing},
   language = {English},
   cr-category = {C.0 Computer Systems Organization, General,     D.2.9 Software Engineering Management,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {In the field of cloud computing, the automated deployment of applications is of vital importance and supported by diverse management technologies. However, currently there is no systematic knowledge collection that points out commonalities, capabilities, and differences of these approaches. This paper aims at identifying common modeling principles employed by technologies to create automatically executable models that describe the deployment of applications. We discuss two fundamental approaches for modeling the automated deployment of applications: imperative procedural models and declarative models. For these two approaches, we identified (i) basic pattern primitives and (ii) documented these approaches as patterns that point out frequently occurring problems in certain contexts including proven modeling solutions. The introduced patterns foster the understanding of common application deployment concepts, are validated regarding their occurrence in established state-of-the-art technologies, and enable the transfer of that knowledge.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-12&engl=1}
}
@inproceedings {INPROC-2017-11,
   author = {Pascal Hirmer},
   title = {{Effizienz-Optimierung daten-intensiver Data Mashups am Beispiel von Map-Reduce}},
   booktitle = {Proceedings der Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW}, 17. Fachtagung des GI-Fachbereichs, Workshopband},
   editor = {Bernhard Mitschang and Norbert Ritter and Holger Schwarz and Meike Klettke and Andreas Thor and Oliver Kopp and Matthias Wieland},
   address = {Stuttgart},
   publisher = {Gesellschaft f{\"u}r Informatik (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNI},
   volume = {P-266},
   pages = {111--116},
   type = {Conference Paper},
   month = {March},
   year = {2017},
   isbn = {978-3-88579-660-2},
   keywords = {Data Mashups; Map-Reduce; Big Data; Effizienzoptimierung},
   language = {German},
   cr-category = {E.0 Data General,     H.2 Database Management,     H.3 Information Storage and Retrieval,     H.4 Information Systems Applications},
   ee = {http://btw2017.informatik.uni-stuttgart.de/slidesandpapers/E1-14/paper_web.pdf},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Data Mashup-Ans{\"a}tze und -Tools bieten einen einfachen und schnellen Weg, um Daten zu verarbeiten und zu analysieren. {\"U}ber eine grafische Oberfl{\"a}che k{\"o}nnen dabei -- in der Regel grafisch -- Datenquellen und Datenoperationen sowie der Datenfluss einfach modelliert werden. Hierdurch ergeben sich vor allem Vorteile durch einfache Bedienbarkeit durch Dom{\"a}nennutzer sowie einer explorativen Vorgehensweise. Jedoch legen vorhandene Data Mashup-Ans{\"a}tze und -Tools wenig Wert auf die Effizienz der Ausf{\"u}hrung, was dadurch begr{\"u}ndet wird, dass durch Data Mashups in der Regel kleine Datenmengen verarbeitet werden. Zu Zeiten von Big Data gilt dies jedoch nicht mehr; schon scheinbar kleine Szenarien enthalten oftmals eine Vielzahl an Daten. Um mit diesem Problem zuk{\"u}nftig umzugehen, stellen wir in diesem Paper eine Konzeptidee am Beispiel von Map-Reduce vor, mit der die Ausf{\"u}hrung von Data Mashups bzgl. Effizienz optimiert werden kann.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-11&engl=1}
}
@inproceedings {INPROC-2017-06,
   author = {Andreas Bader and Oliver Kopp and Michael Falkenthal},
   title = {{Survey and Comparison of Open Source Time Series Databases}},
   booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW2017) -- Workshopband},
   editor = {Bernhard Mitschang and Norbert Ritter and Holger Schwarz and Meike Klettke and Andreas Thor and Oliver Kopp and Matthieas Wieland},
   publisher = {K{\"o}llen Druck+Verlag GmbH},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics (LNI)},
   volume = {P-266},
   pages = {249--268},
   type = {Workshop Paper},
   month = {March},
   year = {2017},
   isbn = {978-3-88579-660-2},
   issn = {1617-5468},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.3.4 Information Storage and Retrieval Systems and Software,     C.2.4 Distributed Systems},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2017-06/INPROC-2017-06.pdf,     http://btw2017.informatik.uni-stuttgart.de/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-06&engl=1}
}
@inproceedings {INPROC-2017-05,
   author = {Laura Kassner and Pascal Hirmer and Matthias Wieland and Frank Steimle and Jan K{\"o}nigsberger and Bernhard Mitschang},
   title = {{The Social Factory: Connecting People, Machines and Data in Manufacturing for Context-Aware Exception Escalation}},
   booktitle = {Proceedings of the 50th Hawaii International Conference on System Sciences},
   publisher = {Online},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {January},
   year = {2017},
   isbn = {978-0-9981331-0-2},
   keywords = {decision support; internet of things; smart manufacturing; social media; text analytics},
   language = {English},
   cr-category = {E.0 Data General,     H.2 Database Management,     H.3 Information Storage and Retrieval,     H.4 Information Systems Applications},
   ee = {http://hdl.handle.net/10125/41355},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Manufacturing environments are socio-technical systems $\backslash$ where people have to interact with machines to achieve $\backslash$ a common goal. The goal of the fourth industrial revolution is $\backslash$ to improve their flexibility for mass customization and rapidly $\backslash$ changing production conditions. As a contribution towards $\backslash$ this goal, we introduce the Social Factory: a social network $\backslash$ with a powerful analytics backend to improve the connection $\backslash$ between the persons working in the production environment, $\backslash$ the manufacturing machines, and the data that is created $\backslash$ in the process. We represent machines, people and chatbots $\backslash$ for information provisioning as abstract users in the social $\backslash$ network. We enable natural language based communication between $\backslash$ them and provide a rich knowledge base and automated $\backslash$ problem solution suggestions. Access to complex production $\backslash$ environments thus becomes intuitive, cooperation among users $\backslash$ improves and problems are resolved more easily.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-05&engl=1}
}
@inproceedings {INPROC-2017-04,
   author = {Matthias Wieland and Pascal Hirmer and Frank Steimle and Christoph Gr{\"o}ger and Bernhard Mitschang and Eike Rehder and Dominik Lucke and Omar Abdul Rahman and Thomas Bauernhansl},
   title = {{Towards a Rule-Based Manufacturing Integration Assistant}},
   booktitle = {Proceedings of the 49th CIRP Conference on Manufacturing Systems (CIRP-CMS 2016); Stuttgart, Germany, May 25-27, 2016},
   editor = {Engelbert Westk{\"a}mper and Thomas Bauernhansl},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Procedia CIRP},
   volume = {57},
   pages = {213--218},
   type = {Conference Paper},
   month = {January},
   year = {2017},
   doi = {10.1016/j.procir.2016.11.037},
   keywords = {Rules; Integration; Manufacturing; Smart-Factory; Industrie 4.0},
   language = {English},
   cr-category = {H.4.0 Information Systems Applications General,     J.2 Physical Sciences and Engineering,     I.2.1 Applications and Expert Systems,     I.2.4 Knowledge Representation Formalisms and Methods},
   ee = {http://www.sciencedirect.com/science/article/pii/S221282711631191X},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Recent developments and steadily declining prices in ICT enable an economic application of advanced digital tools in wide areas of manufacturing. Solutions based on concepts and technologies of the Internet of Thingsť or Cyber Physical Systems can be used to implement monitoring as well as self-organization of production, maintenance or logistics processes. However, integration of new digital tools in existing heterogeneous manufacturing IT systems and integration of machines and devices into manufacturing environments is an expensive and tedious task. Therefore, integration issues on IT and manufacturing level significantly prevent agile manufacturing. Especially small and medium-sized enterprises do not have the expertise or the investment possibilities to realize such an integration. To tackle this issue, we present the approach of the Manufacturing Integration Assistant - MIALinx. The objective is to develop and implement a lightweight and easy-to-use integration solution for small and medium-sized enterprises based on recent web automation technologies. MIALinx aims to simplify the integration using simple programmable, flexible and reusable IF-THEN rules that connect occurring situations in manufacturing, such as a machine break down, with corresponding actions, e.g., an automatic maintenance order generation. For this purpose, MIALinx connects sensors and actuators based on defined rules whereas the rule set is defined in a domain-specific, easy-to-use manner to enable rule modeling by domain experts. Through the definition of rule sets, the workers{\^a}€™ knowledge can be also externalized. Using manufacturing-approved cloud computing technologies, we enable robustness, security, and a low-effort, low-cost integration of MIALinx into existing manufacturing environments to provide advanced digital tools also for small and medium-sized enterprises.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-04&engl=1}
}
@inproceedings {INPROC-2016-54,
   author = {Henri Tokola and Christoph Gr{\"o}ger and Eeva J{\"a}rvenp{\"a}{\"a} and Esko Niemi},
   title = {{Designing Manufacturing Dashboards on the Basis of a Key Performance Indicator Survey}},
   booktitle = {Proceedings of the 49th CIRP Conference on Manufacturing Systems (CIRP CMS)},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Procedia CIRP},
   volume = {57},
   pages = {619--624},
   type = {Conference Paper},
   month = {May},
   year = {2016},
   keywords = {Dashboards; Key Performance Indicators (KPIs); Scorecard},
   language = {English},
   cr-category = {J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Target-oriented and real-time information provisioning across all hierarchy levels, from shop floor to top floor, is an important success factory for manufacturing companies to facilitate agile and efficient manufacturing. In general, dashboards – in terms of digital single-screen displays – address this challenge and support intuitive monitoring and visualisation of business performance information. Yet, existing dashboard research mainly focus on IT issues and lack a systematic study of the dashboard content. To address this gap, in this paper, we design three representative dashboards for manufacturing companies based on a comprehensive survey that focuses on suitable key performance indicators for different manufacturing target groups. The paper consists of three parts. First, the paper provides a literature review about design principles of dashboards. Second, it publishes the results of a survey of manufacturing companies on preferred key performance indicators (KPIs) for dashboards and the use of dashboards. Third, using the results obtained from the survey, three representative manufacturing dashboards are designed: an operational dashboard for workers, a tactical dashboard for managers and a strategy dashboard for executives. The results underline that different KPIs are preferred for dashboards on different hierarchy levels and that mobile usage of dashboards, especially on tablet pcs, is favoured.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-54&engl=1}
}
@inproceedings {INPROC-2016-42,
   author = {Frank Steimle and Matthias Wieland},
   title = {{ECHO – An mHealth Solution to Support Treatment of Chronic Patients}},
   booktitle = {Proceedings of the 8th Central European Workshop on Services and their Composition, ZEUS 2016},
   editor = {Christoph Hochreiner and Stefan Schulte},
   publisher = {CEUR Workshop Proceedings},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {64--67},
   type = {Demonstration},
   month = {February},
   year = {2016},
   keywords = {mHealth; eHealth; Monitoring; Cloud Computing; Analysis},
   language = {German},
   cr-category = {C.2.4 Distributed Systems,     H.2.8 Database Applications,     J.3 Life and Medical Sciences},
   ee = {http://ceur-ws.org/Vol-1562/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {More and more people all over the world suffer from chronic diseases, like asthma. The German-Greek bilateral research project Enhancing Chronic Patients Health Online developed online services for physicians and patients for use on smart phones or web browsers, in order to improve monitoring of those patients and to be able to detect possible exacerbations earlier. During the project we have developed smart phone applications and websites for both patients and physicians and a cloud-based health data management system. This demonstration shows how our system supports physicians and patients.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-42&engl=1}
}
@inproceedings {INPROC-2016-39,
   author = {Ana Cristina Franco da Silva and Uwe Breitenb{\"u}cher and K{\'a}lm{\'a}n K{\'e}pes and Oliver Kopp and Frank Leymann},
   title = {{OpenTOSCA for IoT: Automating the Deployment of IoT Applications based on the Mosquitto Message Broker}},
   booktitle = {Proceedings of the 6th International Conference on the Internet of Things (IoT)},
   address = {Stuttgart},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {181--182},
   type = {Demonstration},
   month = {November},
   year = {2016},
   isbn = {978-1-4503-4814-0/16/11},
   doi = {10.1145/2991561.2998464},
   keywords = {Internet of Things; Cyber-Physical Systems; Sensor Integration; Message Broker; Mosquitto; MQTT; TOSCA},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems,     D.2.12 Software Engineering Interoperability},
   contact = {For questions, feel free to contact me franco-da-silva@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Automating the deployment of IoT applications is a complex challenge, especially if multiple heterogeneous sensors, actuators, and business components have to be integrated. This demonstration paper presents a generic, standards-based system that is able to fully automatically deploy IoT applications based on the TOSCA standard, the standardized MQTT messaging protocol, the Mosquitto message broker, and the runtime environment OpenTOSCA. We describe a demonstration scenario and explain in detail how this scenario can be deployed fully automatically using the mentioned technologies.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-39&engl=1}
}
@inproceedings {INPROC-2016-35,
   author = {Jan K{\"o}nigsberger and Bernhard Mitschang},
   title = {{A Semantically-enabled SOA Governance Repository}},
   booktitle = {Proceedings of the 2016 IEEE 17th International Conference on Information Reuse and Integration},
   editor = {IEEE Computer Society},
   address = {Los Alamitos, California, Washington, Tokyo},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {423--432},
   type = {Conference Paper},
   month = {August},
   year = {2016},
   isbn = {978-1-5090-3207-5},
   keywords = {SOA; Governance; Repository; Semantic Web},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     H.3.5 Online Information Services,     I.2.4 Knowledge Representation Formalisms and Methods},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Companies in today's world need to cope with an ever greater need for flexible and agile IT systems to keep up with the competition and rapidly changing markets. This leads to increasingly complex system landscapes that are often realized using service-oriented architectures (SOA). Companies often struggle to handle the complexity and the governance activities necessary after this paradigm shift. We therefore present a semantically-enabled SOA Governance Repository as the central tool to manage and govern all SOA-related activities within a company. This repository is based on our previously defined key governance aspects as well as our SOA Governance Meta Model (SOA-GovMM). We describe how our repository is able to support and improve the speed and flexibility of company's IT processes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-35&engl=1}
}
@inproceedings {INPROC-2016-30,
   author = {Pascal Hirmer},
   title = {{Flexible Execution and Modeling of Data Processing and Integration Flows}},
   booktitle = {Proceedings of the 10th Advanced Summer School on Service Oriented Computing},
   editor = {Johanna Barzen and Rania Khalaf and Frank Leymann and Bernhard Mitschang},
   publisher = {IBM Research Report},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {26--40},
   type = {Conference Paper},
   month = {September},
   year = {2016},
   keywords = {Big Data; Data Integration; Data Flows; Pipes and Filters},
   language = {English},
   cr-category = {E.0 Data General,     E.1 Data Structures,     H.1 Models and Principles},
   ee = {http://domino.research.ibm.com/library/cyberdig.nsf/papers/EC7D5D883519DC7E85258035004DBD19/$File/rc25624.pdf},
   contact = {Pascal.Hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, the amount of data highly increases within all domains due to cheap hardware, fast network connections, and an increasing digitization. Deriving information and, as a consequence, knowledge from this huge amount of data is a complex task. Data sources are oftentimes very heterogeneous, dynamic, and distributed. This makes it difficult to extract, transform, process and integrate data, which is necessary to gain this knowledge. Furthermore, extracting knowledge oftentimes requires technical experts with the necessary skills to conduct the required techniques. For my PhD thesis, I am working on a new and improved approach for data extraction, processing, and integration by: (i) facilitating the definition and processing of data processing and integration scenarios through graphical creation of flow models, (ii) enabling an ad-hoc, iterative and explorative approach to receive high-quality results, and (iii) a flexible execution of the data processing tailor-made for users’ non-functional requirements. By providing these means, I enable a more flexible data processing by a wider range of users, not only limited to technical experts. This paper describes the approach of the thesis as well as the publications until today.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-30&engl=1}
}
@inproceedings {INPROC-2016-29,
   author = {Cornelia Kiefer},
   title = {{Assessing the Quality of Unstructured Data: An Initial Overview}},
   booktitle = {Proceedings of the LWDA 2016 Proceedings (LWDA)},
   editor = {Ralf Krestel and Davide Mottin and Emmanuel M{\"u}ller},
   address = {Aachen},
   publisher = {CEUR Workshop Proceedings},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {62--73},
   type = {Conference Paper},
   month = {September},
   year = {2016},
   isbn = {1613-0073},
   keywords = {quality of unstructured data, quality of text data, data, quality dimensions, data quality assessment, data quality metrics},
   language = {English},
   cr-category = {A.1 General Literature, Introductory and Survey,     I.2.7 Natural Language Processing},
   ee = {http://ceur-ws.org/Vol-1670/paper-25.pdf,     http://ceur-ws.org/Vol-1670/},
   contact = {cornelia.kiefer@gsame.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In contrast to structured data, unstructured data such as texts, speech, videos and pictures do not come with a data model that enables a computer to use them directly. Nowadays, computers can interpret the knowledge encoded in unstructured data using methods from text analytics, image recognition and speech recognition. Therefore, unstructured data are used increasingly in decision-making processes. But although decisions are commonly based on unstructured data, data quality assessment methods for unstructured data are lacking. We consider data analysis pipelines built upon two types of data consumers, human consumers that usually come at the end of the pipeline and non-human / machine consumers (e.g., natural language processing modules such as part of speech tagger and named entity recognizer) that mainly work intermediate. We define data quality of unstructured data via (1) the similarity of the input data to the data expected by these consumers of unstructured data and via (2) the similarity of the input data to the data representing the real world. We deduce data quality dimensions from the elements in analytic pipelines for unstructured data and characterize them. Finally, we propose automatically measurable indicators for assessing the quality of unstructured text data and give hints towards an implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-29&engl=1}
}
@inproceedings {INPROC-2016-28,
   author = {C. Timurhan Sungur and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann and Mozi Song and Andreas Wei{\ss} and Christoph Mayr-Dorn and Schahram Dustdar},
   title = {{Identifying Relevant Resources and Relevant Capabilities of Collaborations - A Case Study}},
   booktitle = {Proceedings of the 2016 IEEE 20th International Enterprise Distributed Object Computing Workshop (EDOCW)},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {352--355},
   type = {Demonstration},
   month = {September},
   year = {2016},
   keywords = {Organizational performance; resource discovery; capability discovery; relevant resources; relevant capabilities; informal processes; unstructured processes},
   language = {English},
   cr-category = {H.4.1 Office Automation,     H.3.3 Information Search and Retrieval,     H.3.4 Information Storage and Retrieval Systems and Software,     H.5.3 Group and Organization Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Organizational processes involving collaborating resources, such as development processes, innovation processes, and decision-making processes, typically affect the performance of many organizations. Moreover, including required but missing, resources and capabilities of collaborations can improve the performance of corresponding processes drastically. In this work, we demonstrate the extended Informal Process Execution (InProXec) method for identifying resources and capabilities of collaborations using a case study on the Apache jclouds project.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-28&engl=1}
}
@inproceedings {INPROC-2016-25,
   author = {Pascal Hirmer and Matthias Wieland and Uwe Breitenb{\"u}cher and Bernhard Mitschang},
   title = {{Dynamic Ontology-based Sensor Binding}},
   booktitle = {Advances in Databases and Information Systems. 20th East European Conference, ADBIS 2016, Prague, Czech Republic, August 28-31, 2016, Proceedings},
   address = {Prague, Czech Republic},
   publisher = {Springer International Publishing},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Information Systems and Applications, incl. Internet/Web, and HCI},
   volume = {9809},
   pages = {323--337},
   type = {Conference Paper},
   month = {August},
   year = {2016},
   isbn = {978-3-319-44039-2},
   isbn = {978-3-319-44038-5},
   doi = {10.1007/978-3-319-44039-2},
   keywords = {Internet of Things; Sensors; Ontologies; Data Provisioning},
   language = {English},
   cr-category = {E.0 Data General,     B.8 Performance and Reliability},
   ee = {http://www.springer.com/de/book/9783319440385},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {In recent years, the Internet of Things gains more and more attention through cheap hardware devices and, consequently, an increased interconnection of them. These devices equipped with sensors and actuators form the foundation for so called smart environments that enable monitoring as well as self-organization. However, an efficient sensor registration, binding, and sensor data provisioning is still a major issue for the Internet of Things. Usually, these steps can take up to days or even weeks due to a manual configuration and binding by sensor experts that furthermore have to communicate with domain-experts that define the requirements, e.g. the types of sensors, for the smart environments. In previous work, we introduced a first vision of a method for automated sensor registration, binding, and sensor data provisioning. In this paper, we further detail and extend this vision, e.g., by introducing optimization steps to enhance efficiency as well as effectiveness. Furthermore, the approach is evaluated through a prototypical implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-25&engl=1}
}
@inproceedings {INPROC-2016-24,
   author = {Alexander Bergmayr and Uwe Breitenb{\"u}cher and Oliver Kopp and Manuel Wimmer and Gerti Kappel and Frank Leymann},
   title = {{From Architecture Modeling to Application Provisioning for the Cloud by Combining UML and TOSCA}},
   booktitle = {Proceedings of the 6th International Conference on Cloud Computing and Services Science (CLOSER 2016)},
   publisher = {SCITEPRESS},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {97--108},
   type = {Conference Paper},
   month = {April},
   year = {2016},
   doi = {10.5220/0005806900970108},
   isbn = {978-989-758-182-3},
   keywords = {TOSCA; UML; Model-Driven Software Engineering; Cloud Computing; Cloud Modeling},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Recent efforts to standardize a deployment modeling language for cloud applications resulted in TOSCA. At the same time, the software modeling standard UML supports architecture modeling from different viewpoints. Combining these standards from cloud computing and software engineering would allow engineers to refine UML architectural models into TOSCA deployment models that enable automatic provisioning of cloud applications. However, this refinement task is currently carried out manually by recreating TOSCA models from UML models because a conceptual mapping between the two languages as basis for an automated translation is missing. In this paper, we exploit cloud modeling extensions to UML called CAML as the basis for our approach CAML2TOSCA, which aims at bridging UML and TOSCA. The validation of our approach shows that UML models can directly be injected into a TOSCA-based provisioning process. As current UML modeling tools lack cloud-based refinement support for deployment models, the added value of CAML2TOSCA is emphasized because it provides the glue between architecture modeling and application provisioning.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-24&engl=1}
}
@inproceedings {INPROC-2016-22,
   author = {Pascal Hirmer and Matthias Wieland and Uwe Breitenb{\"u}cher and Bernhard Mitschang},
   title = {{Automated Sensor Registration, Binding and Sensor Data Provisioning}},
   booktitle = {Proceedings of the CAiSE'16 Forum, at the 28th International Conference on Advanced Information Systems Engineering (CAiSE 2016)},
   address = {Ljubljana, Slovenia},
   publisher = {CEUR-WS.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {CEUR Workshop Proceedings},
   volume = {1612},
   pages = {81--88},
   type = {Conference Paper},
   month = {June},
   year = {2016},
   issn = {1613-0073},
   keywords = {Internet of Things; Sensors; Ontologies; Data Provisioning},
   language = {English},
   cr-category = {J.6 Computer-Aided Engineering,     H.3.1 Content Analysis and Indexing},
   ee = {http://ceur-ws.org/Vol-1612/paper11.pdf},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, the Internet of Things has evolved due to an increasing interconnection of technical devices. However, the automated binding and management of things and sensors is still a major issue. In this paper, we present a method and system architecture for sensor registration, binding, and sensor data provisioning. This approach enables automated sensor integration and data processing by accessing the sensors and provisioning the data. Furthermore, the registration of new sensors is done in an automated way to avoid a complex, tedious manual registration. We enable (i) semantic description of sensors and things as well as their attributes using ontologies, (ii) the registration of sensors of a physical thing, (iii) a provisioning of sensor data using different data access paradigms, and (iv) dynamic sensor binding based on application requirements. We provide the Resource Management Platform as a prototypical implementation of the architecture and corresponding runtime measurements},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-22&engl=1}
}
@inproceedings {INPROC-2016-21,
   author = {C. Timurhan Sungur and Uwe Breitenb{\"u}cher and Frank Leymann and Matthias Wieland},
   title = {{Context-sensitive Adaptive Production Processes}},
   booktitle = {Proceedings of the 48th CIRP Conference on Manufacturing Systems},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Procedia CIRP},
   volume = {41},
   pages = {147--152},
   type = {Conference Paper},
   month = {February},
   year = {2016},
   doi = {10.1016/j.procir.2015.12.076},
   keywords = {Process; Automation; Optimization; Adaptation},
   language = {English},
   cr-category = {H.4.1 Office Automation,     H.5.3 Group and Organization Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {To stay competitive, manufacturing companies need to adapt their processes in a regular basis to the most recent conditions in their corresponding domains. These adaptations are typically the result of turbulences, such as changes in human resources, new technological advancements, or economic crises. Therefore, to increase the efficiency of production processes, (i) automation, (ii) optimization, and (iii) dynamic adaptation became the most important requirements in this field. In this work, we propose a novel process modelling and execution approach for creating self-organizing processes: Production processes are extended by context-sensitive execution steps, for which sub-processes are selected, elected, optimized, and finally executed on runtime. During the election step, the most desired solution is chosen and optimized based on selection and optimization strategies of the respective processes. Moreover, we present a system architecture for modelling and executing these context-sensitive production processes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-21&engl=1}
}
@inproceedings {INPROC-2016-10,
   author = {Christoph Stach},
   title = {{Secure Candy Castle - A Prototype for Privacy-Aware mHealth Apps}},
   booktitle = {Proceedings of the 17th International Conference on Mobile Data Management},
   address = {Porto},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {361--364},
   type = {Demonstration},
   month = {June},
   year = {2016},
   keywords = {mHealth; privacy; diagnostic game; diabetes},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection,     K.8 Personal Computing,     J.3 Life and Medical Sciences},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Due to rising medical costs, the healthcare landscape is on the move. Novel treatment methods are badly required. Especially for the treatment of chronic diseases the usage of smart devices in combination with medical devices for telemedical screenings is a promising approach. If the patients are not in control of the collection and processing of their health data, privacy concerns limit their willingness to use such a method. In this paper, we present a prototype for an Android-based privacy-aware health game for children suffering from diabetes called Secure Candy Castle. In the game, the player keeps an electronic diabetes diary in a playful manner. In doing this, s/he is supported by various sensors. His or her data is analyzed and in case of a critical health condition, the game notifies authorized persons. With our approach, the user stays in control over his or her data, i.e., s/he defines which data should be shared with the game, how accurate this data should be, and even how the data is processed by the game. For this purpose, we apply the Privacy Management Platform, a fine-grained and extendable permission system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-10&engl=1}
}
@inproceedings {INPROC-2016-09,
   author = {Christoph Stach and Bernhard Mitschang},
   title = {{The Secure Data Container: An Approach to Harmonize Data Sharing with Information Security}},
   booktitle = {Proceedings of the 17th International Conference on Mobile Data Management},
   address = {Porto},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {292--297},
   type = {Conference Paper},
   month = {June},
   year = {2016},
   keywords = {smart devices; information security; data sharing},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Smart devices became Marc Weiser's Computer of the 21st Century. Due to their versatility a lot of private data enriched by context data are stored on them. Even the health industry utilizes smart devices as portable health monitors and enablers for telediagnosis. So they represent a severe risk for information security. Yet the platform providers' countermeasures to these threats are by no means sufficient. In this paper we describe how information security can be improved. Therefore, we postulate requirements towards a secure handling of data. Based on this requirements specification, we introduce a secure data container as an extension for the Privacy Management Platform. Since a complete isolation of an app is usually not practicable, our approach also provides secure data sharing features. Finally, we evaluate our approach from a technical point of view as well as a security point of view and show its applicability in an eHealth scenario.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-09&engl=1}
}
@inproceedings {INPROC-2016-07,
   author = {Christoph Gr{\"o}ger and Laura Kassner and Eva Hoos and Jan K{\"o}nigsberger and Cornelia Kiefer and Stefan Silcher and Bernhard Mitschang},
   title = {{The Data-Driven Factory. Leveraging Big Industrial Data for Agile, Learning and Human-Centric Manufacturing}},
   booktitle = {Proceedings of the 18th International Conference on Enterprise Information Systems},
   editor = {Slimane Hammoudi and Leszek Maciaszek and Michele M. Missikoff and Olivier Camp and Jose Cordeiro},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {40--52},
   type = {Conference Paper},
   month = {April},
   year = {2016},
   isbn = {978-989-758-187-8},
   keywords = {IT Architecture, Data Analytics, Big Data, Smart Manufacturing, Industrie 4.0},
   language = {English},
   cr-category = {H.4.0 Information Systems Applications General,     J.2 Physical Sciences and Engineering},
   contact = {Email an Christoph.Groeger@ipvs.uni-stuttgart.de oder laura.kassner@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Global competition in the manufacturing industry is characterized by ever shorter product life cycles, increas-ing complexity and a turbulent environment. High product quality, continuously improved processes as well as changeable organizational structures constitute central success factors for manufacturing companies. With the rise of the internet of things and Industrie 4.0, the increasing use of cyber-physical systems as well as the digitalization of manufacturing operations lead to massive amounts of heterogeneous industrial data across the product life cycle. In order to leverage these big industrial data for competitive advantages, we present the concept of the data-driven factory. The data-driven factory enables agile, learning and human-centric manu-facturing and makes use of a novel IT architecture, the Stuttgart IT Architecture for Manufacturing (SITAM), overcoming the insufficiencies of the traditional information pyramid of manufacturing. We introduce the SITAM architecture and discuss its conceptual components with respect to service-oriented integration, ad-vanced analytics and mobile information provisioning in manufacturing. Moreover, for evaluation purposes, we present a prototypical implementation of the SITAM architecture as well as a real-world application sce-nario from the automotive industry to demonstrate the benefits of the data-driven factory.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-07&engl=1}
}
@inproceedings {INPROC-2016-06,
   author = {Laura Kassner and Bernhard Mitschang},
   title = {{Exploring Text Classification for Messy Data: An Industry Use Case for Domain-Specific Analytics}},
   booktitle = {Advances in Database Technology - EDBT 2016, 19th International Conference on Extending Database Technology, Bordeaux, France, March 15-16, Proceedings},
   publisher = {OpenProceedings.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {491--502},
   type = {Conference Paper},
   month = {March},
   year = {2016},
   isbn = {978-3-89318-070-7},
   keywords = {recommendation system; automotive; text analytics; domain-specific language; automatic classification},
   language = {English},
   cr-category = {H.3.1 Content Analysis and Indexing,     H.3.3 Information Search and Retrieval,     H.4.2 Information Systems Applications Types of Systems,     J.1 Administration Data Processing},
   ee = {http://openproceedings.org/2016/conf/edbt/paper-52.pdf},
   contact = {Email an laura.kassner@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Industrial enterprise data present classification problems which are different from those problems typically discussed in the scientific community -- with larger amounts of classes and with domain-specific, often unstructured data. We address one such problem through an analytics environment which makes use of domain-specific knowledge. Companies are beginning to use analytics on large amounts of text data which they have access to, but in day-to-day business, manual effort is still the dominant method for processing unstructured data. In the face of ever larger amounts of data, faster innovation cycles and higher product customization, human experts need to be supported in their work through data analytics. In cooperation with a large automotive manufacturer, we have developed a use case in the area of quality management for supporting human labor through text analytics: When processing damaged car parts for quality improvement and warranty handling, quality experts have to read text reports and assign error codes to damaged parts. We design and implement a system to recommend likely error codes based on the automatic recognition of error mentions in textual quality reports. In our prototypical implementation, we test several methods for filtering out accurate recommendations for error codes and develop further directions for applying this method to a competitive business intelligence use case.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-06&engl=1}
}
@inproceedings {INPROC-2015-62,
   author = {Eva Maria Grochowski and Eva Hoos and Stefan Waitzinger and Dieter Spath and Bernhard Mitschang},
   title = {{Web-based collaboration system for interdisciplinary and interorganizational development teams: case study}},
   booktitle = {Proceeding of the 23rd International Conference on Production Research},
   publisher = {-},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--11},
   type = {Conference Paper},
   month = {August},
   year = {2015},
   keywords = {Collaboration; Web-based Platform},
   language = {English},
   cr-category = {J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The automotive industry faces three major challenges – shortage of fossil fuels, politics of global warming and rising competition. In order to remain competitive companies have to develop more efficient and alternative fuel vehicles. Out of these challenges new cooperation models become inevitable. The development of complex products like automobiles claims skills of various disciplines e.g. engineering, IT. Furthermore, these skills are spread all over various companies within the supply chain and beyond. Hence, supporting IT systems for collaborative, innovative work is absolutely essential. Interdisciplinary and interorganizational development has new demands on information systems. These demands are not well analyzed at the moment and therefore, existing collaboration platforms cannot address them. In order to determine these new requirements and show the gap to existing collaboration platform we performed a case study. In this case study, we analyze the research campus “Active Research Environment for the Next Generation of Automobiles” (ARENA2036). It is a is a new cooperation form, where diverse partners from the industry, research institutes and universities elaborate collaboratively future topics in the field of production and light weight construction under “one single roof”. We focus on the special needs of the interdisciplinary, interorganizational partners. The requirements were polled by a questionnaire. About 80 percent of the active research workers in ARENA2036 answered the questionnaire. By the answers we can identify the special needs and also role profiles of the collaborators. The resulting role profiles specify the personal requirements. These are used for an evaluation of existing information platforms. The deficits between the offered features and the demands of the partners, as well as new technologies supporting the individual needs of users are the foundation for the information system concept for ARENA2036. In our findings we present a role-based view on requirements for the development of an information system for collaboration and cooperation. Based on these requirements we then develop a concept for mobile apps with focus on a role-based design.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-62&engl=1}
}
@inproceedings {INPROC-2015-60,
   author = {Pascal Hirmer},
   title = {{Flexible Modeling and Execution of Data Integration Flows}},
   booktitle = {Proceedings of the 9th Advanced Summer School on Service Oriented Computing},
   editor = {Johanna Barzen and Rania Khalaf and Frank Leymann and Bernhard Mitschang},
   publisher = {IBM Research Report},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {153--154},
   type = {Conference Paper},
   month = {December},
   year = {2015},
   keywords = {Big Data; Data Integration; Data Flows; Pipes and Filters},
   language = {English},
   cr-category = {E.0 Data General,     E.1 Data Structures,     H.1 Models and Principles},
   ee = {http://domino.research.ibm.com/library/cyberdig.nsf/papers/656B934403848E8A85257F1D00695A63/$File/rc25564.pdf},
   contact = {Pascal.Hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {For my PhD, I am working towards an approach for data flow-based, ad-hoc data integration based on cloud computing technologies. I started my work roughly one year ago. In the following, I will present the research problem and introduce a plan how to cope with the introduced issues.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-60&engl=1}
}
@inproceedings {INPROC-2015-57,
   author = {Uwe Breitenb{\"u}cher and Pascal Hirmer and K{\'a}lm{\'a}n K{\'e}pes and Oliver Kopp and Frank Leymann and Matthias Wieland},
   title = {{A Situation-Aware Workflow Modelling Extension}},
   booktitle = {Proceedings of the 17th International Conference on Information Integration and Web-based Applications \& Services (iiWAS 2015)},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {478--484},
   type = {Conference Paper},
   month = {December},
   year = {2015},
   keywords = {Situation-Aware Workflows; Workflow Modelling; Workflow Management; Situation-Awareness; Workflow Execution},
   language = {English},
   cr-category = {D.3.3 Programming Language Constructs and Features,     H.4.1 Office Automation},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The automation of business processes is of vital importance for organizations to speed up their business and to lower costs. Due to emerging technologies in the field of Internet of Things, changing situations can be recognized automatically, which provides the basis for an automated adaptation of process executions in order to react to changing circumstances. Although approaches exist that enable creating self-adapting workflows, a systematic modelling approach that supports the specification of situational dependencies directly in workflow models is missing. In this paper, we tackle this issue by presenting a modelling extension called SitME that defines (i) an extensible Situation Event type, (ii) the concept of Situational Scopes, and (iii) a visual notation. As the introduced extension is language-independent, we apply the approach to BPEL to validate its practical feasibility.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-57&engl=1}
}
@inproceedings {INPROC-2015-55,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Oliver Kopp and Frank Leymann and Johannes Wettinger},
   title = {{A Modelling Concept to Integrate Declarative and Imperative Cloud Application Provisioning Technologies}},
   booktitle = {Proceedings of the 5th International Conference on Cloud Computing and Services Science (CLOSER 2015)},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {487--496},
   type = {Conference Paper},
   month = {May},
   year = {2015},
   keywords = {Cloud Application Provisioning; Automation; Declarative Modelling; Imperative Modelling},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Efficient application provisioning is one of the most important issues in Cloud Computing today. For that purpose, various provisioning automation technologies have been developed that can be generally categorized into two different flavors: (i) declarative approaches are based on describing the desired goals whereas (ii) imperative approaches are used to describe explicit sequences of low-level tasks. Since modern Cloud-based business applications become more and more complex, employ a plethora of heterogeneous components and services that must be wired, and require complex configurations, the two kinds of technologies have to be integrated to model the provisioning of such applications. In this paper, we present a process modelling concept that enables the seamless integration of imperative and declarative provisioning models and their technologies while preserving the strengths of both flavors. We validate the technical feasibility of the approach by applying the concept to the workflow language BPEL and evaluate its features by several criteria.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-55&engl=1}
}
@inproceedings {INPROC-2015-52,
   author = {Ulrike Pado and Cornelia Kiefer},
   title = {{Short Answer Grading: When Sorting Helps and When it Doesn’t}},
   booktitle = {Proceedings of the 4th workshop on NLP for Computer Assisted Language Learning, NODALIDA 2015},
   editor = {Link{\"o}pings universitet Link{\"o}ping University Electronic Press},
   address = {Wilna},
   publisher = {LiU Electronic Press and ACL Anthology},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Link{\"o}ping Electronic Conference Proceedings},
   pages = {42--50},
   type = {Workshop Paper},
   month = {May},
   year = {2015},
   isbn = {978-91-7519-036-5},
   keywords = {short-answer grading; assisted grading; short-answer corpora},
   language = {English},
   cr-category = {J Computer Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Automatic short-answer grading promises improved student feedback at reduced teacher effort both during and after in- struction. Automated grading is, how- ever, controversial in high-stakes testing and complex systems can be difficult to set up by non-experts, especially for fre- quently changing questions. We propose a versatile, domain-independent system that assists manual grading by pre-sorting an- swers according to their similarity to a ref- erence answer. We show near state-of- the-art performance on the task of auto- matically grading the answers from CREG (Meurers et al., 2011). To evaluate the grader assistance task, we present CSSAG (Computer Science Short Answers in Ger- man), a new corpus of German computer science questions answered by natives and highly-proficient non-natives. On this cor- pus, we demonstrate the positive influence of answer sorting on the slowest-graded, most complex-to-assess questions.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-52&engl=1}
}
@inproceedings {INPROC-2015-47,
   author = {Oliver Kopp and Michael Falkenthal and Niklas Hartmann and Frank Leymann and Holger Schwarz and Jessica Thomsen},
   title = {{Towards a Cloud-based Platform Architecture for a Decentralized Market Agent}},
   booktitle = {INFORMATIK 2015},
   editor = {Douglas Cunningham and Petra Hofstedt and Klaus Meer and Ingo Schmitt},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics (LNI)},
   volume = {P-246},
   pages = {69--80},
   type = {Workshop Paper},
   month = {September},
   year = {2015},
   isbn = {978-3-88579-640-4},
   issn = {1617-5468},
   language = {English},
   cr-category = {J.m Computer Applications Miscellaneous},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Reorganization of power generation, thereby replacing conventional energy sources by innovative renewable energy sources, demands a change in distribution grid structure and operation. The foreseen Decentralized Marked Agent is a new role in the energy market sector accomplishing not only trading on energy and operating reserve markets but also regulating flexibilities at the distribution grid level, such as energy storage and decentralized energy generators, and thereby considering system services and securing system stability. This paper presents requirements on an IT system to support this new role.We design an architecture matching these requirements and show how Cloud computing technology can be used to implement the architecture. This enables data concerning the distribution grid being automatically gathered and processed by dedicated algorithms, aiming to optimize cost efficient operation and the development of the distribution grid.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-47&engl=1}
}
@inproceedings {INPROC-2015-46,
   author = {Jessica Thomsen and Niklas Hartmann and Florian Klumpp and Thomas Erge and Michael Falkenthal and Oliver Kopp and Frank Leymann and Sven Stando and Nino Turek and Christoph Schlenzig and Holger Schwarz},
   title = {{Darstellung des Konzeptes -- DMA Decentralised Market Agent -- zur Bew{\"a}ltigung zuk{\"u}nftiger Herausforderungen in Verteilnetzen}},
   booktitle = {INFORMATIK 2015},
   editor = {Douglas Cunningham and Petra Hofstedt and Klaus Meer and Ingo Schmitt},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics (LNI)},
   volume = {P-246},
   pages = {53--67},
   type = {Workshop Paper},
   month = {September},
   year = {2015},
   isbn = {978-3-88579-640-4},
   issn = {1617-5468},
   language = {German},
   cr-category = {J.m Computer Applications Miscellaneous},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {In der vorliegenden Ver{\"o}ffentlichung wird ein Konzept f{\"u}r einen neuen Marktakteur im Strommarkt vorgestellt, der im zuk{\"u}nftigen Smart Grid als Aggregator und Planer fungieren kann. Dieser Decentralised Market Agent – DMA – soll die Informationen aller vorhandenen Erzeugungs- und Speicheranlagen, Lasten und Netzinformationen auf Verteilnetzebene aggregieren sowie mit lokalen Akteuren und an den zentralen M{\"a}rkten agieren um einen kostenoptimalen Betrieb und Ausbau des Systems Verteilnetzes zu realisieren. Zur Handlungsf{\"a}higkeit dieser neuen Marktrolle bedarf es hochaufl{\"o}sender Messungen im Verteilnetz und einer „real-time“ Aufbereitung der Messdaten. Im vorliegenden Paper sollen das Konzept sowie die notwendigen Bausteine zur Erreichung der Handlungsf{\"a}higkeit des DMA vorgestellt sowie die zuk{\"u}nftig geplanten Untersuchungen erl{\"a}utert werden. Die detaillierte Entwicklung des Konzepts sowie weiterf{\"u}hrende Analysen sind Teil des Projektes NEMAR – Netzbewirtschaftung als neue Marktrolle, gef{\"o}rdert durch BMWi im Rahmen der Forschungsinitiative Zukunftsf{\"a}hige Stromnetze.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-46&engl=1}
}
@inproceedings {INPROC-2015-45,
   author = {Laura Kassner and Cornelia Kiefer},
   title = {{Taxonomy Transfer: Adapting a Knowledge Representing Resource to new Domains and Tasks}},
   booktitle = {Proceedings of the 16th European Conference on Knowledge Management},
   publisher = {acpi Online},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {399--407},
   type = {Conference Paper},
   month = {September},
   year = {2015},
   keywords = {taxonomy; ontology; ontology population; semantic resources; domain-specific language},
   language = {English},
   cr-category = {I.2.7 Natural Language Processing,     I.2.4 Knowledge Representation Formalisms and Methods,     J.7 Computers in Other Systems},
   contact = {Email an laura.kassner@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, data from different sources and different phases of the product life cycle are usually analyzed in isolation and with considerable time delay. Real-time integrated analytics is especially beneficial in a production context. We present an architecture fordata- and analytics-driven exception escalation in manufacturing and show the advantages of integrating unstructured data.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-45&engl=1}
}
@inproceedings {INPROC-2015-34,
   author = {Pascal Hirmer and Matthias Wieland and Holger Schwarz and Bernhard Mitschang and Uwe Breitenb{\"u}cher and Frank Leymann},
   title = {{SitRS - A Situation Recognition Service based on Modeling and Executing Situation Templates}},
   booktitle = {Proceedings of the 9th Symposium and Summer School On Service-Oriented Computing},
   editor = {Johanna Barzen and Rania Khalaf and Frank Leymann and Bernhard Mitschang},
   publisher = {IBM Research Report},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Technical Paper},
   volume = {RC25564},
   pages = {113--127},
   type = {Conference Paper},
   month = {December},
   year = {2015},
   keywords = {Situation Recognition, IoT, Context, Integration, Cloud Computing, OSLC},
   language = {English},
   cr-category = {J.6 Computer-Aided Engineering,     H.3.1 Content Analysis and Indexing},
   ee = {http://domino.research.ibm.com/library/cyberdig.nsf/papers/656B934403848E8A85257F1D00695A63},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, the Internet of Things has evolved due to an advanced connectivity of physical objects. Furthermore, Cloud Computing gains more and more interest for the provisioning of services. In this paper, we want to further improve the integration of these two areas by providing a cloud-based situation recognition service – SitRS. This service can be used to integrate real world objects – the things – into the internet by deriving their situational state based on sensors. This enables context-aware applications to detect events in a smart environment. SitRS is a basic service enabling a generic and easy implementation of Smart* applications such as SmartFactorys, SmartCities, SmartHomes. This paper introduces an approach containing a method and a system architecture for the realization of such a service. The core steps of the method are: (i) registration of the sensors, (ii) modeling of the situation, and (iii) execution of the situation recognition. Furthermore, a prototypical implementation of SitRS is presented and evaluated via runtime measurements.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-34&engl=1}
}
@inproceedings {INPROC-2015-33,
   author = {Pascal Hirmer and Peter Reimann and Matthias Wieland and Bernhard Mitschang},
   title = {{Extended Techniques for Flexible Modeling and Execution of Data Mashups}},
   booktitle = {Proceedings of the 4th International Conference on Data Management Technologies and Applications (DATA)},
   editor = {Markus Helfert and Andreas Holzinger and Orlando Belo and Chiara Francalanci},
   address = {Colmar},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {111--122},
   type = {Conference Paper},
   month = {July},
   year = {2015},
   isbn = {978-989-758-103-8},
   keywords = {Data Mashups, Ad-hoc Integration, Patterns, Data Flow},
   language = {English},
   cr-category = {E.1 Data Structures,     E.5 Data Files},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, a multitude of highly-connected applications and information systems hold, consume and produce huge amounts of heterogeneous data. The overall amount of data is even expected to dramatically increase in the future. In order to conduct, e.g., data analysis, visualizations or other value-adding scenarios, it is necessary to integrate specific, relevant parts of data into a common source. Due to oftentimes changing environments and dynamic requests, this integration has to support ad-hoc and flexible data processing capabilities. Furthermore, an iterative and explorative trial-and-error integration based on different data sources has to be possible. To cope with these requirements, several data mashup platforms have been developed in the past. However, existing solutions are mostly non-extensible, monolithic systems or applications with many limitations regarding the mentioned requirements. In this paper, we introduce an approach that copes with these issues (i) by the introduction of patterns to enable decoupling from implementation details, (ii) by a cloud-ready approach to enable availability and scalability, and (iii) by a high degree of flexibility and extensibility that enables the integration of heterogeneous data as well as dynamic (un-)tethering of data sources. We evaluate our approach using runtime measurements of our prototypical implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-33&engl=1}
}
@inproceedings {INPROC-2015-25,
   author = {Frank Steimle and Matthias Wieland and Bernhard Mitschang and Sebastian Wagner and Frank Leymann},
   title = {{Design and Implementation Issues of a Secure Cloud-Based Health Data Management System}},
   booktitle = {Proceedings of the 9th Symposium and Summer School On Service-Oriented Computing},
   editor = {Johanna Barzen and Rania Khalaf and Frank Leymann and Bernhard Mitschang},
   publisher = {IBM Research Report},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Technical Paper},
   volume = {RC25564},
   pages = {68--82},
   type = {Conference Paper},
   month = {December},
   year = {2015},
   keywords = {eHealth; mHealth; cloud data; data analysis; security},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.8 Database Applications,     J.3 Life and Medical Sciences},
   ee = {http://domino.research.ibm.com/library/cyberdig.nsf/papers/656B934403848E8A85257F1D00695A63},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {eHealth gains more and more interest since a lot of end-user devices which support health data capturing are available. The captured data has to be managed and securely stored, in order to access it from different devices and to share it with other users such as physicians. The aim of the German-Greek research project ECHO is to support the treatment of patients, who suffer from Chronic Obstructive Pulmonary Disease (COPD), a chronic respiratory disease. Usually the patients need to be examined by their physicians on a regular basis due to their chronic condition. Since this is very time consuming and expensive, we develop an eHealth system which allows the physician to monitor patients conditions remotely, e.g., via smart phones. Therefore, a secure data processing and sharing eHealth platform is required. In this paper we introduce a health data model and a corresponding platform-architecture for the management and analysis of the data provided by the patients. Furthermore, we show how the security of the data is ensured and we explain how the platform can be hosted in a cloud-based environment using the OASIS standard TOSCA, which enables a self-contained and portable description and management of cloud-services.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-25&engl=1}
}
@inproceedings {INPROC-2015-24,
   author = {Matthias Wieland and Holger Schwarz and Uwe Breitenb{\"u}cher and Frank Leymann},
   title = {{Towards Situation-Aware Adaptive Workflows}},
   booktitle = {Proceedings of the 13th Annual IEEE Intl. Conference on Pervasive Computing and Communications Workshops: 11th Workshop on Context and Activity Modeling and Recognition},
   address = {St. Louis, Missouri, USA},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {32--37},
   type = {Workshop Paper},
   month = {March},
   year = {2015},
   keywords = {situation-awareness; adaptive-workflows; situation recognition; situation-aware workflow system},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Workflows are an established IT concept to achieve business goals in a reliable and robust manner. However, the dynamic nature of modern information systems, the upcoming Industry 4.0, and the Internet of Things increase the complexity of modeling robust workflows significantly as various kinds of situations, such as the failure of a production system, have to be considered explicitly. Consequently, modeling workflows in a situation-aware manner is a complex challenge that quickly results in big unmanageable workflow models. To overcome these issues, we present an approach that allows workflows to become situation-aware to automatically adapt their behavior according to the situation they are in. The approach is based on aggregated context information, which has been an important research topic in the last decade to capture information about an environment. We introduce a system that derives high-level situations from lower-level context and sensor information. A situation can be used by different situation-aware workflows to adapt to the current situation in their execution environment. SitOPT enables the detection of situations using different situation-recognition systems, exchange of information about detected situations, optimization of the situation recognition, and runtime adaption and optimization of situationaware workflows based on the recognized situations.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-24&engl=1}
}
@inproceedings {INPROC-2015-21,
   author = {Oliver Kopp and Tobias Binz and Uwe Breitenb{\"u}cher and Frank Leymann and Thomas Michelbach},
   title = {{A Domain-Specific Modeling Tool to Model Management Plans for Composite Applications}},
   booktitle = {Proceedings of the 7th Central European Workshop on Services and their Composition, ZEUS 2015},
   editor = {Thomas S. Heinze and Thomas M. Prinz},
   publisher = {CEUR Workshop Proceedings},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {CEUR Workshop Proceedings},
   volume = {1360},
   pages = {51--54},
   type = {Demonstration},
   month = {May},
   year = {2015},
   issn = {1613-0073},
   keywords = {TOSCA; BPMN Extension},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2015-21/INPROC-2015-21.pdf,     http://ceur-ws.org/Vol-1360/,     www.zeus-workshop.eu/2015/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {TOSCA is a standard to describe composite Cloud-applications and their management in a portable fashion. Thereby, BPMN4TOSCA is a proposed extension for BPMN to ease modeling of management plans. This demonstration presents a web-based modeling tool that supports an updated version of BPMN4TOSCA. The updated version supports direct wiring of data of tasks and events without the need of separate data objects.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-21&engl=1}
}
@inproceedings {INPROC-2015-20,
   author = {Sebastian Wagner and Oliver Kopp and Frank Leymann},
   title = {{Choreography-based Consolidation of Interacting Processes Having Activity-based Loops}},
   booktitle = {Proceedings of the 5th International Conference on Cloud Computing and Service Science (CLOSER 2015)},
   address = {Stuttgart},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {284--296},
   type = {Conference Paper},
   month = {May},
   year = {2015},
   keywords = {BPEL; Choreography; Process Consolidation; Loops},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   contact = {sebastian.wagner@iaas.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Choreographies describe the interaction between two or more parties. The interaction behavior description might contain loops. In case two parties want to merge their behavior to gain competitive advantage, the contained loop constructs also have to be merged. This paper presents a language-independent discussion on loop-structure pairing in choreographies and possible merging strategies. Thereby, the focus is turned on loops grouping child activities to be iterated. We show the feasibility of the merging strategies by applying them to BPEL-based choreographies.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-20&engl=1}
}
@inproceedings {INPROC-2015-15,
   author = {Laura Kassner and Bernhard Mitschang},
   title = {{MaXCept – Decision Support in Exception Handling through Unstructured Data Integration in the Production Context. An Integral Part of the Smart Factory.}},
   booktitle = {Proceedings of the 48th Hawaii International Conference on System Sciences: HICSS 48, 2015},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1007--1016},
   type = {Conference Paper},
   month = {January},
   year = {2015},
   keywords = {smart manufacturing; industrial internet; unstructured data; data integration; exception escalation; expert search},
   language = {English},
   cr-category = {H.4.0 Information Systems Applications General,     J.1 Administration Data Processing,     J.7 Computers in Other Systems},
   contact = {laura.kassner@gsame.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, data from different sources and different phases of the product life cycle are usually analyzed in isolation and with considerable time delay. Real-time integrated analytics is especially beneficial in a production context. We present an architecture fordata- and analytics-driven exception escalation in manufacturing and show the advantages of integrating unstructured data.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-15&engl=1}
}
@inproceedings {INPROC-2015-11,
   author = {Christoph Stach},
   title = {{How to Deal with Third Party Apps in a Privacy System - The PMP Gatekeeper}},
   booktitle = {Proceedings of the 16th International Conference on Mobile Data Management},
   address = {Pittsburgh},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {June},
   year = {2015},
   keywords = {Android; Privacy Systems; Legacy Apps},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays, mobile devices collect a lot of private information. Therefore every vendor of a mobile platform has to provide a sufficient mechanism to secure this data. Android pursues a strategy to pass full control (and thus full responsibility) over any private data to the user. However, the Android Permission System is not sufficient for that purpose. Various third party approaches try to enhance the Android privacy policy model. Nevertheless, these approaches have to solve the problem of how to deal with Legacy Apps, i.e., apps that do not collaborate with an enhanced privacy policy model. In this paper, we analyze various alternative privacy systems and discuss different approaches of how to deal with Legacy Apps. Based on our findings, we introduce the so-called PMP Gatekeeper, a best of breed approach dealing with Legacy Apps for the Privacy Management Platform (PMP). The PMP Gatekeeper classifies apps and deals with each class appropriately. So the user can adjust privacy settings for every kind of app. With our prototype we show, that the PMP in combination with the PMP Gatekeeper becomes a holistic privacy system. Although our prototype is for Android, our realization approach can be applied to other application platforms in order to offer a satisfying privacy system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-11&engl=1}
}
@inproceedings {INPROC-2014-76,
   author = {Peter Reimann and Holger Schwarz and Bernhard Mitschang},
   title = {{A Pattern Approach to Conquer the Data Complexity in Simulation Workflow Design}},
   booktitle = {Proceedings of OnTheMove Federated Conferences and Workshops (OTM), 22nd International Conference on Cooperative Information Systems (CoopIS 2014)},
   editor = {R. Meersman et al.},
   address = {Amantea, Italy},
   publisher = {Springer Berlin Heidelberg},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNCS},
   volume = {8841},
   pages = {21--38},
   type = {Conference Paper},
   month = {October},
   year = {2014},
   keywords = {Data Provisioning; Data Management Patterns; SIMPL; Simulation Workflow; Simulation Workflow Design; Workflow; Workflow Design},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases,     H.2.8 Database Applications,     H.4.1 Office Automation},
   contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Scientific workflows may be used to enable the collaborative implementation of scientific applications across various domains. Since each domain has its own requirements and solutions for data handling, such workflows often have to deal with a highly heterogeneous data environment. This results in an increased complexity of workflow design. As scientists typically design their scientific workflows on their own, this complexity hinders them to concentrate on their core issue, namely the experiments, analyses, or simulations they conduct. In this paper, we present a novel approach to a pattern-based abstraction support for the complex data management in simulation workflows that goes beyond related work in similar research areas. A pattern hierarchy with different abstraction levels enables a separation of concerns according to the skills of different persons involved in workflow design. The goal is that scientists are no longer obliged to specify low-level details of data management in their workflows. We discuss the advantages of this approach and show to what extent it reduces the complexity of simulation workflow design. Furthermore, we illustrate how to map patterns onto executable workflows. Based on a prototypical implementation of three real-world simulations, we evaluate our approach according to relevant requirements.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-76&engl=1}
}
@inproceedings {INPROC-2014-75,
   author = {Jan K{\"o}nigsberger and Stefan Silcher and Bernhard Mitschang},
   title = {{SOA-GovMM: A Meta Model for a Comprehensive SOA Governance Repository}},
   booktitle = {Proceedings of the 2014 IEEE 15th International Conference on Information Reuse and Integration},
   editor = {James Joshi and Elisa Bertino and Bhavani Thuraisingham and Ling Liu},
   address = {Piscataway, NJ, USA},
   publisher = {IEEE Systems, Man, and Cybernetics Society (SMC)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {187--194},
   type = {Conference Paper},
   month = {August},
   year = {2014},
   isbn = {978-1-4799-5880-1},
   keywords = {Service-Oriented Architecture, SOA Governance, Meta Model, Governance Repository},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     H.3.3 Information Search and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2014-75/INPROC-2014-75.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In recent years, the paradigm of service-oriented architecture (SOA) has more and more found its way into many organizations. The SOA principles of loosely coupled and reusable services has convinced decision makers in many organizations to start SOA initiatives. Yet, the lack of proper governance mechanisms has doomed many projects to fail. Although some SOA governance frameworks exist, they differ highly in scope and none of them covers the whole spectrum necessary to properly govern a SOA. In this paper we identify and discuss eleven core areas the governance of a SOA has to cover in order to realize the intended benefit in flexibility and agility. We then analyze and evaluate existing SOA governance frameworks with regard to those requirements. Subsequently, we present a meta model composed of four parts: Service Provider, Service Consumer, Organizational Structure and Business Object. We show, that those four parts cover all requirements for a comprehensive SOA governance repository. This allows an organization to leverage the information integrated in the repository to better govern their SOA and therefore improve the chances of its success.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-75&engl=1}
}
@inproceedings {INPROC-2014-66,
   author = {Pascal Hirmer and Uwe Breitenb{\"u}cher and Tobias Binz and Frank Leymann},
   title = {{Automatic Topology Completion of TOSCA-based Cloud Applications}},
   booktitle = {Proceedings des CloudCycle14 Workshops auf der 44. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI)},
   address = {Bonn},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNI},
   volume = {232},
   pages = {247--258},
   type = {Workshop Paper},
   month = {September},
   year = {2014},
   isbn = {978-3-88579-626-8},
   keywords = {TOSCA; Automatic Topology Completion; Provisioning; Cloud Computing; Topology Modeling},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   ee = {http://subs.emis.de/LNI/Proceedings/Proceedings232/article82.html},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Automation of application provisioning is one of the key aspects of Cloud Computing. Standards such as the Topology and Orchestration Specification for Cloud Applications (TOSCA) provide a means to model application topologies which can be provisioned fully automatically. Many automated provisioning engines require that these topologies are complete in the sense of specifying all application, platform, and infrastructure components. However, modeling complete models is a complex, timeconsuming, and error-prone task that typically requires a lot of technical expertise. In this paper, we present an approach that enables users to model incomplete TOSCA application topologies that are completed automatically to deployable, complete models. This enables users to focus on the business-relevant application components and simplifies the creation process tremendously by minimizing the required effort and know-how. We prove the technical feasibility of the presented approach by a prototypical implementation based on the open source modeling tool Winery. In addition, we evaluate the approach by standards-compliance and performance.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-66&engl=1}
}
@inproceedings {INPROC-2014-65,
   author = {Eva Hoos},
   title = {{Design method for developing a Mobile Engineering-Application Middleware (MEAM)}},
   booktitle = {Proceedings of the 2014 IEEE International Conference on Pervasive Computing and Communications Workshops (PerCom Workshops,24-28 March, 2014, Budapest, Hungary},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {176--177},
   type = {Workshop Paper},
   month = {March},
   year = {2014},
   doi = {10.1109/PerComW.2014.6815193},
   language = {English},
   cr-category = {J.2 Physical Sciences and Engineering,     J.4 Social and Behavioral Sciences},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Mobile Apps running on smartphones and tablets offer a new possibility to enhance the work of engineers because they provide an easy-to-use, touchscreen-based handling and can be used anytime and anywhere. Introducing mobile apps in the engineering domain is difficult because the IT environment is heterogeneous and engineering-specific challenges in the app development arise e. g., large amount of data and high security requirements. There is a need for an engineering-specific middleware to facilitate and standardize the app development. However, such a middleware does not yet exist as well as a holistic set of requirements for the development. Therefore, we propose a design method which offers a systematic procedure to develop Mobile Engineering-Application Middleware.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-65&engl=1}
}
@inproceedings {INPROC-2014-64,
   author = {Eva Hoos and Christoph Gr{\"o}ger and Bernhard Mitschang},
   title = {{Mobile Apps in Engineering: A Process-Driven Analysis of Business Potentials and Technical Challenges}},
   booktitle = {Proceedings of the 9th CIRP Conference on Intelligent Computation in Manufacturing Engineering (CIRP ICME), 23-25 July, 2014, Capri (Naples), Italy},
   publisher = {CIRP},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {July},
   year = {2014},
   language = {German},
   cr-category = {H.4.0 Information Systems Applications General,     J.4 Social and Behavioral Sciences,     J.2 Physical Sciences and Engineering},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Mobile apps on smartphones and tablet PCs are more and more employed in enterprises to optimize business processes, e.g. by elimination of paper-based data collection. With respect to engineering, mobile apps provide a huge potential for increased flexibility and efficiency due to their anywhere and anytime characteristics, e.g., for product testing in the field. However, not every usage of mobile apps is beneficial from a business point of view and existing apps for engineering represent only rudimentary front-ends for stationary IT systems without an app-oriented redesign. Hence, there are three core challenges to leverage the potential of mobile apps in engineering: (1) identifying value-added app usage scenarios from a process point of view, (2) realizing a task-oriented and context-aware user interface design and (3) mastering technical obstacles at the app implementation. In this paper, we address these challenges by a case-oriented analysis of selected engineering processes in the automotive industry in order to identify engineering tasks suited for the usage of mobile apps. On this basis, we design corresponding engineering apps and analyze their business potentials. Moreover, we derive common technological challenges for the development of engineering apps, e.g. data synchronization aspects, and highlight further research issues.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-64&engl=1}
}
@inproceedings {INPROC-2014-63,
   author = {Alexander Blehm and Volha Kalach and Alexander Kicherer and Gustav Murawski and Tim Waizenegger and Matthias Wieland},
   title = {{Policy-Framework – Eine Methode zur Umsetzung von Sicherheits-Policies im Cloud-Computing}},
   booktitle = {Proceedings des CloudCycle14 Workshops auf der 44. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI)},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNI},
   type = {Workshop Paper},
   month = {September},
   year = {2014},
   language = {German},
   cr-category = {K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Cloud-Computing gewinnt immer mehr an Bedeutung bei der kosteneffizienten und skalierbaren Bereitstellung von IT-Diensten. Damit sich Cloud-Computing jedoch durchsetzen kann, muss die Sicherheit und Compliance der Dienste garantiert werden, d. h. die Einhaltung von Gesetzen, Richtlinien und Datenschutzvorgaben. Um diese Ziele zu erreichen, wird in diesem Beitrag ein Policy-Framework vorgestellt, welches die Umsetzung von Sicherheits- Policies im Cloud-Computing erm{\"o}glicht. Eine Policy beschreibt dabei nicht-funktionale Anforderungen an Cloud-Dienste. Des weiteren werden verschiedene prototypisch umgesetzte Policies beschieben und es wird ein Moodle- System als Anwendungsbeispiel f{\"u}r einen Cloud-Dienst mit den vorhandenen Policies annotiert. Dadurch erfolgt eine Evaluation des Policy-Frameworks.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-63&engl=1}
}
@inproceedings {INPROC-2014-61,
   author = {Marina Bitsaki and Christos Koutras and Georgios Koutras and Frank Leymann and Bernhard Mitschang and Christos Nikolaou and Nikos Siafakas and Steve Strauch and Nikos Tzanakis and Matthias Wieland},
   title = {{An Integrated mHealth Solution for Enhancing Patients' Health Online}},
   booktitle = {Proceedings of the 6th European Conference of the International Federation for Medical and Biological Engineering (MBEC'14)},
   publisher = {International Federation for Medical and Biological Engineering (IFMBE)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {September},
   year = {2014},
   keywords = {Patient monitoring; COPD; ICT application services; Cloud technology; Online services; Mobile applications; Intelligent data mining},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.8 Database Applications,     H.4.1 Office Automation,     J.3 Life and Medical Sciences},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2014-61/INPROC-2014-61.pdf},
   contact = {a href=``http://www.iaas.uni-stuttgart.de/institut/mitarbeiter/strauch''Steve Strauch/ a},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Lack of time or economic difficulties prevent chronic obstructive pulmonary disease patients from communicating with their physicians, thus inducing exacerbation of their chronic condition and possible hospitalization. In this paper we propose a platform that integrates mobile application technologies and cloud computing to provide regular monitoring of patients and avoidance of medical emergencies.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-61&engl=1}
}
@inproceedings {INPROC-2014-59,
   author = {Laura Kassner and Christoph Gr{\"o}ger and Bernhard Mitschang and Engelbert Westk{\"a}mper},
   title = {{Product Life Cycle Analytics - Next Generation Data Analytics on Structured and Unstructured Data}},
   booktitle = {Proceedings of the 9th CIRP Conference on Intelligent Computation in Manufacturing Engineering - CIRP ICME '14},
   address = {Naples},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {July},
   year = {2014},
   keywords = {analytics, big data, unstructured data, text analytics, product life cycle management, PLM, data warehousing, product life cycle analytics, data integration},
   language = {English},
   cr-category = {H.3.1 Content Analysis and Indexing,     H.3.4 Information Storage and Retrieval Systems and Software,     J.2 Physical Sciences and Engineering,     J.6 Computer-Aided Engineering},
   contact = {Per Mail an laura.kassner@gsame.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Enormous amounts of unstructured data, e. g., emails, failure reports and customer complaints, are abundant around the product life cycle and provide a huge potential for analytics-driven optimization. However, existing analytics approaches on unstructured data are fraught with three major insufficiencies limiting comprehensive business improvement: (1) they focus on isolated data sources from a single life cycle phase {\^a}€“ for example, data from a customer relationship management system are mined for frequent complaints without considering manufacturing failure reports related to the same product; (2) they do not make use of structured data for holistic analytics, e. g., to automatically correlate unstructured failure reports with structured performance data of a manufacturing execution system; (3) existing implementations of data integration and analytics components are typically cost-intensive, manual and case-based, without a general framework. To address these issues, we present our Product Life Cycle Analytics (PLCA) approach, a platform and a reference architecture for the holistic integration and analysis of unstructured and structured data from multiple data sources around the product life cycle. For this purpose, we survey structured and unstructured data sources around the product life cycle and discuss limitations of existing analytics approaches like traditional Business Intelligence applications. Moreover, we develop use cases for holistic life-cycle-oriented analytics and give examples based on case study investigations, e. g., for the holistic analysis of unstructured failure reports in the automotive industry. On this basis, we discuss technical requirements and components of our reference architecture, such as a versatile, plug-and-play Natural Language Processing pipeline and mechanisms for linking structured and unstructured data in a holistic data warehouse. Finally, we analyse implementation issues and investigate underlying technologies from the areas of text analytics and data mining in order to evaluate our architecture with respect to the identified use cases.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-59&engl=1}
}
@inproceedings {INPROC-2014-58,
   author = {Christoph Stach and Bernhard Mitschang},
   title = {{Design and Implementation of the Privacy Management Platform}},
   booktitle = {Proceedings of the 15th International Conference on Mobile Data Management},
   address = {Brisbane},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {July},
   year = {2014},
   keywords = {Android; policy model; implementation strategies},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays, mobile platform vendors have to concern themselves increasingly about how to protect their users' privacy. As Google is less restrictive than their competitors regarding their terms of use for app developers, it is hardly surprising that malware spreads even in Google Play. To make matters worse, in Android every user is responsible for his or her private data and s/he is frequently overwhelmed with this burden because of the fragile Android permission mechanism. Thus, the calls for a customizable, fine-grained, context-based, crash-proof, and intuitive privacy management system are growing louder. To cope with these requests, we introduce the Privacy Management Platform (PMP) and we discuss three alternative implementation strategies for such a system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-58&engl=1}
}
@inproceedings {INPROC-2014-52,
   author = {Peter Reimann and Tim Waizenegger and Matthias Wieland and Holger Schwarz},
   title = {{Datenmanagement in der Cloud f{\"u}r den Bereich Simulationen und Wissenschaftliches Rechnen}},
   booktitle = {Proceedings des 2. Workshop Data Management in the Cloud auf der 44. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI)},
   editor = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   address = {Stuttgart, Deutschland},
   publisher = {Lecture Notes in Informatics (LNI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Workshop Paper},
   month = {September},
   year = {2014},
   language = {German},
   cr-category = {H.2.5 Heterogeneous Databases,     H.2.8 Database Applications,     H.4.1 Office Automation},
   contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {F{\"u}r Organisationen, die Simulationen nicht als ihr Kerngesch{\"a}ft verstehen und sie daher eher sporadisch durchf{\"u}hren, lohnt sich der Betrieb einer eigenen Recheninfrastruktur nur selten. Dies betrifft z.B. kleine und mittlere Unternehmen sowie einige wissenschaftliche Institutionen. Besserung k{\"o}nnen {\"o}ffentliche Cloud-Infrastrukturen als Plattform f{\"u}r die Ausf{\"u}hrung von Simulationen verschaffen. Das Datenmanagement in der Cloud ist aber speziell f{\"u}r den Bereich Simulationen noch weitgehend unerforscht. In diesem Beitrag identifizieren wir daher noch offene Fragestellungen bzgl. des Datenmanagements von Simulationen in der Cloud. Dies betrifft vor allem die Datenbereitstellung und inwieweit nutzer- und simulationsspezifische Anforderungen an das Datenmanagement in der Cloud eingehalten werden k{\"o}nnen. Wir untersuchen Technologien, welche sich diesen Fragestellungen widmen, und diskutieren, ob und wie sie in der Cloud sowie f{\"u}r Simulationen einsetzbar sind. Weiterhin skizzieren wir wichtige zuk{\"u}nftige Forschungsthemen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-52&engl=1}
}
@inproceedings {INPROC-2014-51,
   author = {Peter Reimann and Holger Schwarz},
   title = {{Simulation Workflow Design Tailor-Made for Scientists}},
   booktitle = {Proceedings of the 26th International Conference on Scientific and Statistical Database Management},
   address = {Aalborg, Denmark},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Demonstration},
   month = {June},
   year = {2014},
   keywords = {Data Provisioning; Data Management Patterns; Simulation Workflow; Simulation Workflow Design},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases,     H.2.8 Database Applications,     H.4.1 Office Automation},
   contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Scientific workflows have to deal with highly heterogeneous data environments. In particular, they have to carry out complex data provisioning tasks that filter and transform heterogeneous input data in such a way that underlying tools or services can ingest them. This results in a high complexity of workflow design. Scientists often want to design their workflows on their own, but usually do not have the necessary skills to cope with this complexity. Therefore, we have developed a pattern-based approach to workflow design, thereby mainly focusing on workflows that realize numeric simulations. This approach removes the burden from scientists to specify low-level details of data provisioning. In this demonstration, we apply a prototype implementation of our approach to various use cases and show how it makes simulation workflow design tailor-made for scientists.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-51&engl=1}
}
@inproceedings {INPROC-2014-50,
   author = {Peter Reimann and Holger Schwarz and Bernhard Mitschang},
   title = {{Data Patterns to Alleviate the Design of Scientific Workflows Exemplified by a Bone Simulation}},
   booktitle = {Proceedings of the 26th International Conference on Scientific and Statistical Database Management},
   address = {Aalborg, Denmark},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {June},
   year = {2014},
   keywords = {Data Provisioning; Data Management Patterns; Workflow; SIMPL; Simulation Workflow; BPEL; WS-BPEL},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases,     H.2.8 Database Applications,     H.4.1 Office Automation},
   contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Scientific workflows often have to process huge data sets in a multiplicity of data formats. For that purpose, they typically embed complex data provisioning tasks that transform these heterogeneous data into formats the underlying tools or services can handle. This results in an increased complexity of workflow design. As scientists typically design their scientific workflows on their own, this complexity hinders them to concentrate on their core issue, namely the experiments, analyses, or simulations they conduct. In this paper, we present the core idea of a pattern-based approach to alleviate the design of scientific workflows. This approach is particularly targeted at the needs of scientists. We exemplify and assess the pattern-based design approach by applying it to a complex scientific workflow realizing a real-world simulation of structure changes in bones.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-50&engl=1}
}
@inproceedings {INPROC-2014-49,
   author = {Christoph Gr{\"o}ger and Holger Schwarz and Bernhard Mitschang},
   title = {{The Deep Data Warehouse. Link-based Integration and Enrichment of Warehouse Data and Unstructured Content}},
   booktitle = {Proceedings of the 18th IEEE International Enterprise Distributed Object Computing Conference (EDOC), 01-05 September, 2014, Ulm, Germany},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {September},
   year = {2014},
   language = {English},
   cr-category = {H.2.7 Database Administration},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Data warehouses are at the core of enterprise IT and enable the efficient storage and analysis of structured data. Besides, unstructured content, e.g., emails and documents, constitutes more than half of the entire enterprise data and contains a lot of implicit knowledge about warehouse entities. Thus, holistic ana-lytics require the integration of structured warehouse data and unstructured content to generate novel insights. These insights can also be used to enrich the integrated data and to create a new basis for further analytics. Existing integration approaches only support a limited range of analytical applications and require the costly adaptation of the warehouse schema. In this paper, we present the Deep Data Warehouse (DeepDWH), a novel type of data warehouse based on the flexible integration and enrichment of warehouse data and unstructured content, addressing the variety challenge of Big Data. It relies on information-rich in-stance-level links between warehouse elements and content items, which are represented in a graph-oriented structure. Neither adaptations of the existing warehouse nor the design of an overall federated schema are required. We design a conceptual linking model and develop a logical schema for links based on a property graph. As a proof of concept, we present a prototypical imple-mentation of the DeepDWH including a link store based on a graph database.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-49&engl=1}
}
@inproceedings {INPROC-2014-43,
   author = {Marcel Clappier and Tobias Helbig and Jan K{\"o}nigsberger and Julia Sch{\"u}tten-Breitenbach and Kamran Taheri},
   title = {{A Decision Concept for the Economic Evaluation of Different Recycling Paths in the Dismantling of End-of-Life Vehicles}},
   booktitle = {Smart Digital Futures 2014},
   editor = {Rui Neves-Silva and George A. Tshirintzis and Vladimir Uskov and Robert J. Howlett and Lakhmi C. Jain},
   address = {Amsterdam, Berlin, Tokyo, Washington},
   publisher = {IOS Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Frontiers in Artificial Intelligence and},
   volume = {262},
   pages = {38--47},
   type = {Conference Paper},
   month = {January},
   year = {2014},
   isbn = {978-1-61499-404-6},
   isbn = {978-1-61499-405-3},
   keywords = {decision concept, end-of-life vehicles, recycling, IT concept, app concept},
   language = {English},
   cr-category = {H.4.2 Information Systems Applications Types of Systems,     H.5.2 Information Interfaces and Presentation User Interfaces},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2014-43/INPROC-2014-43.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Due to the scarcity of raw materials, the recycling of end-of-life vehicles is becoming increasingly important. The essential decision for the cycle of materials is made in the dismantling company which disassembles the vehicle parts and determines the further recycling path: reuse as a replacement part, specific substantial exploitation or exploitation by shredding. This decision is the central aspect of this paper, taking into account the economic aspects, the uncertainties of the market and the applicability of the method. Therefore a detailed cost analysis model is presented, including a method for prediction of the replacement part market. In addition an IT concept is presented to visualize the result of the analysis and support the decision making.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-43&engl=1}
}
@inproceedings {INPROC-2014-36,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Oliver Kopp and Frank Leymann and Matthias Wieland},
   title = {{Context-aware Cloud Application Management}},
   booktitle = {Proceedings of the 4th International Conference on Cloud Computing and Services Science (CLOSER 2014)},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {499--509},
   type = {Conference Paper},
   month = {April},
   year = {2014},
   keywords = {Application Management; Context; Automation; Cloud Computing},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The automation of application management is one of the most important issues in Cloud Computing. However, the steadily increasing number of different services and software components employed in composite Cloud applications leads to a higher risk of unexpected side effects when different technologies work together that bring their own proprietary management APIs. Due to unknown dependencies and the increasing diversity and heterogeneity of employed technologies, even small management tasks on single components may compromise the whole application functionality for reasons that are neither expected nor obvious to non-experts. In this paper, we tackle these issues by introducing a method that enables detecting and correcting unintended effects of management tasks in advance by analyzing the context in which tasks are executed. We validate the method practically and show how context-aware expert management knowledge can be applied fully automatically to running Cloud applications.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-36&engl=1}
}
@inproceedings {INPROC-2014-28,
   author = {Christoph Gr{\"o}ger and Holger Schwarz and Bernhard Mitschang},
   title = {{Prescriptive Analytics for Recommendation-based Business Process Optimization}},
   booktitle = {Proceedings of the 17th International Conference on Business Information Systems (BIS), 22-23 May, 2014, Larnaca, Cyprus},
   editor = {Witold Abramowicz and Angelika Kokkinaki},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {176},
   pages = {25--37},
   type = {Conference Paper},
   month = {May},
   year = {2014},
   keywords = {Prescriptive Analytics, Process Optimization, Process Warehouse, Data Mining, Business Intelligence, Decision Support},
   language = {English},
   cr-category = {H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Continuously improved business processes are a central success factor for companies. Yet, existing data analytics do not fully exploit the data generated during process execution. Particularly, they miss prescriptive techniques to transform analysis results into improvement actions. In this paper, we present the data-mining-driven concept of recommendation-based business process op-timization on top of a holistic process warehouse. It prescriptively generates ac-tion recommendations during process execution to avoid a predicted metric de-viation. We discuss data mining techniques and data structures for real-time prediction and recommendation generation and present a proof of concept based on a prototypical implementation in manufacturing.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-28&engl=1}
}
@inproceedings {INPROC-2014-25,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Oliver Kopp and Frank Leymann},
   title = {{Vinothek - A Self-Service Portal for TOSCA}},
   booktitle = {Proceedings of the 6th Central-European Workshop on Services and their Composition (ZEUS 2014)},
   editor = {Nico Herzberg and Matthias Kunze},
   publisher = {CEUR-WS.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {CEUR Workshop Proceedings},
   volume = {1140},
   pages = {69--72},
   type = {Demonstration},
   month = {March},
   year = {2014},
   issn = {1613-0073},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {http://ceur-ws.org/Vol-1140/,     http://www.zeus-workshop.eu/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The TOSCA standard provides a means to describe Cloud applications and their management in a portable way. TOSCA-based applications can be deployed on various standard-compliant TOSCA Runtimes. Vinothek is a Web-based Self-Service Portal that hides the technical details of TOSCA Runtimes and provides end users a simple graphical interface to provision Cloud applications on demand. This demonstration shows how Vinothek supports automated provisioning of applications and how it facilitates integrating TOSCA Runtimes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-25&engl=1}
}
@inproceedings {INPROC-2014-17,
   author = {Sebastian Wagner and Oliver Kopp and Frank Leymann},
   title = {{Choreography-based Consolidation of Multi-Instance BPEL Processes}},
   booktitle = {Proceedings of the 4th International Conference on Cloud Computing and Services Science (CLOSER 2014);Barcelona, Spain, April 3-5, 2014.},
   editor = {SciTePress},
   address = {Barcelona},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--12},
   type = {Conference Paper},
   month = {April},
   year = {2014},
   keywords = {BPEL; Choreography; Process Consolidation; Multi-Instance Interactions},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   contact = {sebastian.wagner@iaas.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Interaction behavior between processes of different organizational units such as an enterprise and its suppliers can be modeled by choreographies. When organizations decide, for instance, to gain more control about their suppliers to minimize transaction costs, they may decide to insource these companies. This especially includes the integration of the partner processes into the organization’s processes. Existing works are able to merge single-instance BPEL process interactions where each process model is only instantiated once during choreography execution. However, there exist different interaction scenarios where one process interacts with several instances of another process and where the number of instances involved is not known at design time but determined during runtime of the choreography. In this work we investigate these interaction scenarios and extend the process consolidation approach in a way that we can emulate the multi-instance interaction scenarios in the merged process model.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-17&engl=1}
}
@inproceedings {INPROC-2014-14,
   author = {Eva Hoos and Christoph Gr{\"o}ger and Stefan Kramer and Bernhard Mitschang},
   title = {{Improving Business Processes through Mobile Apps - An Analysis Framework to Identify Value-added App Usage Scenarios}},
   booktitle = {Proceedings of the 16th International Conference on Enterprise Information Systems (ICEIS), 27-30 April, 2014, Lisbon, Portugal},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {April},
   year = {2014},
   keywords = {Business Processes; Analysis Framework; Mobile Application},
   language = {English},
   cr-category = {H.1.1 Systems and Information Theory,     K.6.1 Project and People Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Mobile apps offer new possibilities to improve business processes. However, the introduction of mobile apps is typically carried out from a technology point of view. Hence, process improvement from a business point of view is not guaranteed. There is a methodological lack for a holistic analysis of business processes regarding mobile technology. For this purpose, we present an analysis framework, which comprises a systematic methodology to identify value-added usage scenarios of mobile technology in business processes with a special focus on mobile apps. The framework is based on multi-criteria analysis and portfolio analy- sis techniques and it is evaluated in a case-oriented investigation in the automotive industry.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-14&engl=1}
}
@inproceedings {INPROC-2014-10,
   author = {Christoph Gr{\"o}ger and Holger Schwarz and Bernhard Mitschang},
   title = {{The Manufacturing Knowledge Repository. Consolidating Knowledge to Enable Holistic Process Knowledge Management in Manufacturing}},
   booktitle = {Proceedings of the 16th International Conference on Enterprise Information Systems (ICEIS), 27-30 April, 2014, Lisbon, Portugal},
   publisher = {SciTePress},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {April},
   year = {2014},
   language = {English},
   cr-category = {H.2.7 Database Administration,     J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The manufacturing industry is faced with strong competition making the companies’ knowledge resources and their systematic management a critical success factor. Yet, existing concepts for the management of process knowledge in manufacturing are characterized by major shortcomings. Particularly, they are either exclusively based on structured knowledge, e. g., formal rules, or on unstructured knowledge, such as documents, and they focus on isolated aspects of manufacturing processes. To address these issues, we present the Manufacturing Knowledge Repository, a holistic repository that consolidates structured and unstructured process knowledge to facilitate knowledge management and process optimization in manufacturing. First, we define requirements, especially the types of knowledge to be handled, e. g., data mining models and text documents. Next, we develop a conceptual repository data model associating knowledge items and process components such as machines and process steps. Furthermore, we discuss implementation issues including storage architecture variants and present both an evaluation of the data model and a proof of concept based on a prototypical implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-10&engl=1}
}
@inproceedings {INPROC-2014-09,
   author = {Christoph Gr{\"o}ger and Christoph Stach},
   title = {{The Mobile Manufacturing Dashboard}},
   booktitle = {Proceedings of the 2014 IEEE International Conference on Pervasive Computing and Communications Workshops (PerCom Workshops), 24-28 March, 2014, Budapest, Hungary},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Demonstration},
   month = {March},
   year = {2014},
   language = {English},
   cr-category = {J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Real-time monitoring and analysis of manufacturing processes are critical success factors in the smart factory. While there is a variety of data analytics tools for process optimization, almost each of these applications is designed for desktop PCs and focuses on selected process aspects, only. I. e., there is a gap between the site the analysis outcomes occur (the management level) and the site where an immediate reaction to these results is required (the factory shop floor). Even worse, there is no mobile, holistic and analytics-based information provisioning tool for workers and production supervisors on the shop floor but rudimentary systems designed for limited application areas, only. Therefore, we introduce our Mobile Manufacturing Dashboard (MMD), a situation-aware manufacturing dashboard for mobile devices. The MMD provides advanced analytics and addresses the full range of process-oriented information needs of both shop floor workers and production supervisors. In this paper, we give a brief overview of the MMD’s major architecture and implementation aspects and describe two representative real-world scenarios for the MMD. These characteristic scenarios target shop floor workers and production supervisors and illustrate situation-aware information provisioning in the smart factory.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-09&engl=1}
}
@inproceedings {INPROC-2013-50,
   author = {Tobias Binz and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann},
   title = {{Automated Discovery and Maintenance of Enterprise Topology Graphs}},
   booktitle = {Proceedings of the 6th IEEE International Conference on Service Oriented Computing \& Applications (SOCA 2013)},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {126--134},
   type = {Conference Paper},
   month = {December},
   year = {2013},
   doi = {10.1109/SOCA.2013.29},
   keywords = {Discovery; Maintenance; Enterprise Topology Graph; Enterprise IT; Crawling},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems,     D.2.12 Software Engineering Interoperability},
   contact = {a href=``http://www.iaas.uni-stuttgart.de/institut/mitarbeiter/binz''Tobias Binz/ a},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Enterprise Topology Graphs (ETGs) represent a snapshot of the complete enterprise IT, including all its applications, processes, services, components, and their dependencies. In the past, ETGs have been applied in analysis, optimization, and adaptation of enterprise IT. But how to discover and maintain a complete, accurate, fresh, and fine-grained Enterprise Topology Graph? Existing approaches either do not provide enough technical details or do not cover the complete scope of Enterprise Topology Graphs. Although existing tools are able to discover valuable information, there is no means for seamless integration. This paper proposes a plugin-based approach and extensible framework for automated discovery and maintenance of Enterprise Topology Graphs. The approach is able to integrate various kinds of tools and techniques into a unified model. We implemented the proposed approach in a prototype and applied it to different scenarios. Due to the vital role of discovery plugins in our approach, we support plugin development with a systematic testing method and discuss the lessons we learned. The results presented in this paper enable new ways of enterprise IT optimization, analysis, and adaptation. Furthermore, they unlock the full potential of past research, which previously required manual modeling of ETGs.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-50&engl=1}
}
@inproceedings {INPROC-2013-49,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Oliver Kopp and Frank Leymann and Johannes Wettinger},
   title = {{Integrated Cloud Application Provisioning: Interconnecting Service-Centric and Script-Centric Management Technologies}},
   booktitle = {Proceedings of the 21st International Conference on Cooperative Information Systems (CoopIS 2013)},
   address = {Stuttgart},
   publisher = {Springer Berlin Heidelberg},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Computer Science},
   volume = {8185},
   pages = {130--148},
   type = {Conference Paper},
   month = {September},
   year = {2013},
   isbn = {978-3-642-41029-1},
   doi = {10.1007/978-3-642-41030-7_9},
   keywords = {Cloud Application Provisioning; Integration; Management Scripts; Management Services},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Modern Cloud applications employ a plethora of components and XaaS offerings that need to be configured during provisioning. Due to increased heterogeneity, complexity is growing and existing approaches reach their limits if multiple different provisioning and configuration technologies are involved. They are not able to integrate them in an automated, flexible, and customizable way. Especially combining proprietary management services with script-centric configuration management technologies is currently a major challenge. To enable automated provisioning of such applications, we introduce Generic Lifecycle Management Planlets that provide a means to combine custom provisioning logic with common provisioning tasks. We implemented planlets for provisioning and customization of components and XaaS offerings based on both SOAP and RESTful Web services as well as configuration management technologies such as Chef to show the feasibility of the approach. By using our approach, multiple technologies can be combined seamlessly.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-49&engl=1}
}
@inproceedings {INPROC-2013-48,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Oliver Kopp and Frank Leymann and Matthias Wieland},
   title = {{Policy-Aware Provisioning of Cloud Applications}},
   booktitle = {SECURWARE 2013, The Seventh International Conference on Emerging Security Information, Systems and Technologies},
   publisher = {Xpert Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {86--95},
   type = {Conference Paper},
   month = {August},
   year = {2013},
   isbn = {978-1-61208-298-1},
   keywords = {Cloud Applications; Provisioning; Security; Policies},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   ee = {http://www.thinkmind.org/index.php?view=article&articleid=securware_2013_4_40_30149},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The automated provisioning of complex composite Cloud applications is a major issue and of vital importance in Cloud computing. It is key to enable Cloud properties such as pay-as-you-go pricing, on-demand self-service, and elasticity. The functional aspects of provisioning such as instantiating virtual machines or installing software components are covered by several technologies on different technical levels: some are targeted to a pretty high level such as Amazon’s Cloud Formation, some deal with deep technical issues based on scripts such as Chef or Puppet. However, the currently available solutions are tightly coupled to individual technologies without being able to consider non-functional security requirements in a non-proprietary and interoperable way. In this paper, we present a concept and framework extension enabling the integration of heterogeneous provisioning technologies under compliance with non-functional aspects defined by policies.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-48&engl=1}
}
@inproceedings {INPROC-2013-46,
   author = {Oliver Kopp and Tobias Binz and Uwe Breitenb{\"u}cher and Frank Leymann},
   title = {{Winery - A Modeling Tool for TOSCA-based Cloud Applications}},
   booktitle = {Proceedings of 11th International Conference on Service-Oriented Computing (ICSOC'13)},
   publisher = {Springer Berlin Heidelberg},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNCS},
   volume = {8274},
   pages = {700--704},
   type = {Demonstration},
   month = {December},
   year = {2013},
   doi = {10.1007/978-3-642-45005-1_64},
   keywords = {Cloud Applications; Modeling; TOSCA; Management; Portability},
   language = {English},
   cr-category = {K.1 The Computer Industry,     K.6.4 System Management,     D.2.12 Software Engineering Interoperability},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {TOSCA is a new OASIS standard to describe composite applications and their management. The structure of an application is described by a topology, whereas management plans describe the application's management functionalities, e.g., provisioning or migration. Winery is a tool offering an HTML5-based environment for graph-based modeling of application topologies and defining reusable component and relationship types. Thereby, it uses TOSCA as internal storage, import, and export format. This demonstration shows how Winery supports modeling of TOSCA-based applications. We use the school management software Moodle as running example throughout the paper.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-46&engl=1}
}
@inproceedings {INPROC-2013-45,
   author = {Tobias Binz and Uwe Breitenb{\"u}cher and Florian Haupt and Oliver Kopp and Frank Leymann and Alexander Nowak and Sebastian Wagner},
   title = {{OpenTOSCA - A Runtime for TOSCA-based Cloud Applications}},
   booktitle = {Proceedings of 11th International Conference on Service-Oriented Computing (ICSOC'13)},
   publisher = {Springer Berlin Heidelberg},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNCS},
   volume = {8274},
   pages = {692--695},
   type = {Demonstration},
   month = {December},
   year = {2013},
   doi = {10.1007/978-3-642-45005-1_62},
   keywords = {TOSCA; Cloud Applications; Automation; Management; Portability},
   language = {English},
   cr-category = {K.1 The Computer Industry,     K.6.4 System Management,     D.2.12 Software Engineering Interoperability},
   contact = {a href=``http://www.iaas.uni-stuttgart.de/institut/mitarbeiter/binz''Tobias Binz/ a},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {TOSCA is a new standard facilitating platform independent description of Cloud applications. OpenTOSCA is a runtime for TOSCA-based Cloud applications. The runtime enables fully automated plan-based deployment and management of applications defined in the OASIS TOSCA packaging format CSAR. This paper outlines the core concepts of TOSCA and provides a system overview on OpenTOSCA by describing its modular and extensible architecture, as well as presenting our prototypical implementation. We demonstrate the use of OpenTOSCA by deploying and instantiating the school management and learning application Moodle.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-45&engl=1}
}
@inproceedings {INPROC-2013-44,
   author = {Tim Waizenegger and Matthias Wieland and Tobias Binz and Uwe Breitenb{\"u}cher and Frank Leymann},
   title = {{Towards a Policy-Framework for the Deployment and Management of Cloud Services}},
   booktitle = {SECURWARE 2013, The Seventh International Conference on Emerging Security Information, Systems and Technologies},
   editor = {Hans-Joachim Hof and Carla Westphall},
   address = {Barcelona, Spain},
   publisher = {IARIA},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {14--18},
   type = {Conference Paper},
   month = {August},
   year = {2013},
   isbn = {978-1-61208-298-1},
   keywords = {Cloud Computing; Security; Policy-Framework; TOSCA; Cloud Service; Cloud Management},
   language = {English},
   cr-category = {D.2.7 Software Engineering Distribution, Maintenance, and Enhancement,     D.2.9 Software Engineering Management,     D.2.13 Software Engineering Reusable Software},
   contact = {tim.waizenegger@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {As the adoption of Cloud Computing is growing, the automated deployment of cloud-based systems is becoming more and more important. New standards, such as TOSCA (OASIS), allow the modeling of interoperable Cloud services. It is now possible to build reusable and portable cloud services that can be (semi-) automatically deployed by different cloud-deployment-engines at various Cloud environments. However, there is still an acceptance problem among potential users, especially in the enterprise segment, that stems from security issues like data security. To improve security in automatic Cloud management engines, this paper proposes a framework for processing non-functional requirements of Cloud services.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-44&engl=1}
}
@inproceedings {INPROC-2013-43,
   author = {Tim Waizenegger and Matthias Wieland and Tobias Binz and Uwe Breitenb{\"u}cher and Florian Haupt and Oliver Kopp and Frank Leymann and Bernhard Mitschang and Alexander Nowak and Sebastian Wagner},
   title = {{Policy4TOSCA: A Policy-Aware Cloud Service Provisioning Approach to Enable Secure Cloud Computing}},
   booktitle = {On the Move to Meaningful Internet Systems: OTM 2013 Conferences},
   editor = {Robert Meersman and Herve Panetto and Tharam Dillon and Johann Eder and Zohra Bellahsene and Norbert Ritter and Pieter De Leenheer and Dou Deijing},
   address = {Heidelberg},
   publisher = {Springer Berlin Heidelberg},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Computer Science (LNCS)},
   volume = {8185},
   pages = {360--376},
   type = {Conference Paper},
   month = {September},
   year = {2013},
   isbn = {978-3-642-41029-1},
   doi = {10.1007/978-3-642-41030-7_26},
   keywords = {Cloud Computing, TOSCA, Cloud Service, Cloud Management, Policy-Framework, Security, Green-IT, Sustainable Cloud Service},
   language = {English},
   cr-category = {D.2.7 Software Engineering Distribution, Maintenance, and Enhancement,     D.2.9 Software Engineering Management,     D.2.13 Software Engineering Reusable Software},
   contact = {tim.waizenegger@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {With the growing adoption of Cloud Computing, automated deployment and provisioning systems for Cloud applications are becoming more prevalent. They help to reduce the onboarding costs for new customers as well as the financial impact of managing Cloud Services by automating these previously manual tasks. With the widespread use of such systems, the adoption of a common standard for describing Cloud applications will provide a crucial advantage by enabling reusable and portable applications. TOSCA, a newly published standard by OASIS with broad industry participation provides this opportunity. Besides the technical requirements of running and managing applications in the cloud, non-functional requirements, like cost, security, and environmental issues, are of special importance when moving towards the automated provisioning and management of Cloud applications. In this paper we demonstrate how non-functional requirements are defined in TOSCA using policies. We propose a mechanism for automatic processing of these formal policy definitions in a TOSCA runtime environment that we have developed based on the proposed architecture of the TOSCA primer. In order to evaluate our approach, we present prototypical implementations of security policies for encrypting databases and for limiting the geographical location of the Cloud servers. We demonstrate how our runtime environment is ensuring these policies and show how they affect the deployment of the application.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-43&engl=1}
}
@inproceedings {INPROC-2013-38,
   author = {Stefan Silcher and Jan K{\"o}nigsberger and Peter Reimann and Bernhard Mitschang},
   title = {{Cooperative service registries for the service-based Product Lifecycle Management architecture}},
   booktitle = {Proceedings of the 17th IEEE International Conference on Computer Supported Cooperative Work in Design (CSCWD '13)},
   publisher = {IEEE Xplore},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {439--446},
   type = {Conference Paper},
   month = {June},
   year = {2013},
   isbn = {978-1-4673-6083-8},
   doi = {10.1109/CSCWD.2013.6581003},
   keywords = {Collaborative Product Lifecycle Management; Cooperative Service Registries; Enterprise Service Bus; Service-oriented Architecture},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software,     H.3.4 Information Storage and Retrieval Systems and Software,     J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Product Lifecycle Management (PLM) comprises many different tasks across multiple domains, such as product development and production. Thus, multidisciplinary engineering teams have to collaborate to successfully design and produce products. Nowadays, engineers are supported with many software solutions, which are tailored to the work of each engineer. The problem is the missing or bad integration between these IT solutions, which leads to noncontinuous processes and an insufficient cooperation. The Service-oriented Architecture (SOA) supports the needed flexible integration of applications based on services and moreover an automation and integration of processes via workflows. In previous work, we proposed a service-oriented PLM architecture that provides these benefits and supports continuous processes. Thereby, services of different domains and phases of the product life cycle need to collaborate in a distributed fashion. In this paper, we systematically identify, define and rate representative models for the management of corresponding distributed service registries, which enable an efficient collaboration of services. Based on a prototypical implementation of the best-rated model in a layout redesign scenario, we assess our approach for its suitability in PLM. The selected service registry model provides transparent access to all services of different domains and shows the ease of integrating new applications into the product life cycle. It thereby enables an improved cooperation of engineers across various domains to define cross-domain processes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-38&engl=1}
}
@inproceedings {INPROC-2013-34,
   author = {Stefan Silcher and Barbara Seeberg and Erich Zahn and Bernhard Mitschang},
   title = {{A Holistic Management Model for Manufacturing Companies and Related IT Support}},
   booktitle = {Procedia CIRP},
   publisher = {CIRP},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {175--180},
   type = {Conference Paper},
   month = {July},
   year = {2013},
   issn = {2212-8271},
   doi = {http://dx.doi.org/10.1016/j.procir.2013.05.030},
   keywords = {Product Lifecycle Management, Supply Chain Management, Factory Lifecycle Management, Holistic Management Model, IT Integration, Service-oriented Architecture, Enterprise Service Bus},
   language = {English},
   cr-category = {C.1.3 Processor Architectures, Other Architecture Styles,     J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Abstract Life cycle and management concepts are a necessity to compete in current turbulent markets. Small- and medium-sized enterprises (SME) struggle when realizing such concepts and accordant $\backslash${IT$\backslash$} support. In this paper we review different concepts and their similarities and differences are discussed. We focus on Product Lifecycle Management (PLM), Supply Chain Management and Factory Lifecycle Management to integrate them into a holistic management model. Subsequently, we extend a service-based $\backslash${PLM$\backslash$} architecture to support the holistic management model to continuously support processes. The usage of standardized technologies allows companies, and especially SMEs, to implement this architecture with low costs and effort.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-34&engl=1}
}
@inproceedings {INPROC-2013-32,
   author = {Carlos L{\"u}bbe and Bernhard Mitschang},
   title = {{Holistic Load-Balancing in a Distributed Spatial Cache}},
   booktitle = {Proceedings of the 2013 IEEE 14th International Conference on Mobile Data Management},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {267--270},
   type = {Conference Paper},
   month = {June},
   year = {2013},
   doi = {10.1109/MDM.2013.38},
   keywords = {Caching; Geographic Information Systems; Peer-to-peer},
   language = {English},
   cr-category = {H.2 Database Management},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2013-32/INPROC-2013-32.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {A steadily growing number of people using location based services (LBS) inflict massive query loads on the data tier of an LBS. As such queries usually possess considerable overlap, multiple cache nodes collaborating in a distributed spatial cache can provide scalable access to frequently used data. To preserve high throughput throughout the complete execution process, it is necessary to balance the accumulating load among the participating cache nodes. In this work, we identify three key-indicators to improve resource utilization during the load-balancing process: data skew, anticipated data access patterns and dynamic load peaks. For this reason, we introduce a comprehensive mathematical model to express the key-indicators as probability distribution functions. We fuse the different key-indicators into a single holistic distribution model. In the course of this, we devise a methodology from our holistic distribution model towards a distributed spatial cache offering improved load-balancing},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-32&engl=1}
}
@inproceedings {INPROC-2013-24,
   author = {Christoph Stach},
   title = {{Wie funktioniert Datenschutz auf Mobilplattformen?}},
   booktitle = {Informatik 2013: Informatik angepasst an Mensch, Organisation und Umwelt, Tagungsband der 43. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI), 16.09. - 20.09.2013, Universit{\"a}t Koblenz-Landau},
   editor = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics},
   pages = {1--15},
   type = {Workshop Paper},
   month = {September},
   year = {2013},
   keywords = {Datenschutz; Mobilplattform; Berechtigungssystem; Privacy Management Platform},
   language = {German},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die wachsende Verbreitung von mobilen Ger{\"a}ten, bei denen einerseits sehr viele Kontextdaten und andererseits zahlreich pers{\"o}nliche Informationen anfallen, macht diese zu einem hervorragenden Ziel f{\"u}r Angriffe auf die Privatsph{\"a}re. Versch{\"a}rft wird diese Situation dadurch, dass jede Mobilplattform eine eigene Strategie zum Schutz dieser Daten verfolgt, allerdings ohne dabei den Nutzer in geeignetem Ma{\ss}e mit einzubeziehen. Aus diesem Grund gibt es eine Vielzahl an Erweiterungen f{\"u}r diese Berechtigungssysteme. F{\"u}r den Nutzer bleibt dabei weiterhin die Frage, f{\"u}r welche Plattform und f{\"u}r welches Berechtigungssysteme er sich entscheiden soll. In diesem Papier besch{\"a}ftigen wir uns daher mit den Eigenschaften aktueller Mobilplattformen und einiger aktueller Berechtigungssysteme. Wir stellen mit der Privacy Management Platform (PMP) unser eigenes Berechtigungssystem vor, das sich stark an den Bed{\"u}rfnissen der Nutzer orientiert. Neben dem Modell f{\"u}r die Berechtigungsrichtlinien hat allerdings auch die Art, wie diese Modell in die Mobilplattform eingebunden wird, entscheidenden Einfluss auf die Eigenschaften des Systems. Durch die Gegen{\"u}berstellung dieser Eigenschaften, wird dem Nutzer die Wahl einer Plattform und eines Berechtigungssystems, das seinen Bed{\"u}rfnissen gen{\"u}gt, erleichtert.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-24&engl=1}
}
@inproceedings {INPROC-2013-15,
   author = {Christoph Gr{\"o}ger and Mark Hillmann and Friedemann Hahn and Bernhard Mitschang and Engelbert Westk{\"a}mper},
   title = {{The Operational Process Dashboard for Manufacturing}},
   booktitle = {Proceedings of the 46th CIRP Conference on Manufacturing Systems (CMS2013), 29-31 May, 2013, Sesimbra, Portugal},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {May},
   year = {2013},
   language = {English},
   cr-category = {J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Agility is a critical success factor for manufacturers in today’s volatile global environment and requires employees monitoring their performance and reacting quickly to turbulences. Thus, comprehensive information provisioning on all hierarchy levels is necessary. Yet, existing IT systems, e. g., Manufacturing Execution Systems, scarcely address information needs of workers on the shop floor level. This causes uncoordinated waiting times, inflexibility and costly communication. To address these issues, we present the Operational Process Dashboard for Manufacturing (OPDM), a mobile dashboard for shop floor workers. We identify process-oriented information needs, develop technical dashboard services and define IT requirements for an implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-15&engl=1}
}
@inproceedings {INPROC-2013-14,
   author = {Christoph Gr{\"o}ger and Stefan Silcher and Engelbert Westk{\"a}mper and Bernhard Mitschang},
   title = {{Leveraging Apps in Manufacturing. A Framework for App Technology in the Enterprise}},
   booktitle = {Proceedings of the 46th CIRP Conference on Manufacturing Systems (CMS2013), 29-31 May, 2013, Sesimbra, Portugal},
   publisher = {Elsevier},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {May},
   year = {2013},
   language = {English},
   cr-category = {J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Apps on mobile devices like smartphones have become the core of the digital life of consumers. Apps are used, e. g., for shopping or communicating in social networks. Recently, apps are gaining more and more attention in enterprises as enabler for agile process optimization. In this article, we discuss the potentials and challenges of exploiting this technology with a focus on the manufacturing industry. We come up with a framework for apps in manufacturing companies and identify major areas that need further investigations to fully leverage apps. Moreover, we present existing and novel apps across the product life cycle.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-14&engl=1}
}
@inproceedings {INPROC-2013-13,
   author = {Christoph Stach},
   title = {{How to Assure Privacy on Android Phones and Devices?}},
   booktitle = {Proceedings of the 14th International Conference on Mobile Data Management},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--3},
   type = {Demonstration},
   month = {June},
   year = {2013},
   keywords = {privacy management; Android; demonstrator},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {There is an increasing popularity of mobile devices-especially Android devices-particularly because of the huge amount of available third-party applications. Albeit, the number of diagnosed hacker attacks against mobile user increased in unison, as these devices became the prime target of the latest malware, thanks to inexperienced users and a negligent way of dealing with private data. To make matters worse, the Android permission system is much too coarse-grained and too hard to grasp for an average user. However, even if a user is able to comprehend the meaning and impact of a certain permission, in the end, s/he must grant all requested permission anyhow, if s/he wants to install the application. Therefore, we introduce PMP a privacy management platform for Android, which enables a user to grant an application fine-grained access rights to critical data. Furthermore, those rights can depend on some contextual constraints (e.g. Internet usage is restricted to certain locations) and the policy rules can be modified at run-time. Depending upon the granted rights an application provides a different scope of service. Moreover, the user is-due to a catchy GUI-always informed what impact the granting or respectively the revocation of a permission has on the application's service quality.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-13&engl=1}
}
@inproceedings {INPROC-2013-12,
   author = {Tim Waizenegger and Schiller Oliver and Mega Cataldo},
   title = {{Datensicherheit in mandantenf{\"a}higen Cloud Umgebungen}},
   booktitle = {Tagungsband: Proceedings der 15. Fachtagung des GI-Fachbereichs „Datenbanken und Informationssysteme“ (DBIS)},
   editor = {Gesellschaft f{\"u}r Informatik (GI)},
   address = {Magdeburg},
   publisher = {Gesellschaft f{\"u}r Informatik (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Series of the Gesellschaft f{\"u}r Informatik (GI)},
   pages = {477--489},
   type = {Conference Paper},
   month = {March},
   year = {2013},
   isbn = {978-3-88579-608-4},
   keywords = {Cloud; Cloud Computing; Security; Mandantenf{\"a}hig; Schl{\"u}sselverwaltung; Key Management},
   language = {German},
   cr-category = {D.4.6 Operating Systems Security and Protection,     E.3 Data Encryption},
   contact = {tim.waizenegger@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Cloud Computing wird aktuell haupts{\"a}chlich f{\"u}r wissenschaftliches Rechnen und endkundenorientierte Dienste verwendet, da die Kostenersparnis hier ein besonders wichtiger Faktor ist. Die Betreiber von Cloud Plattformen sind jedoch immer st{\"a}rker daran interessiert Cloud Dienste auch im Enterprise Segment anzubieten, um hier gleicherma{\ss}en von Kostenvorteilen zu profitieren. Die Kundenresonanz aus diesem Segment l{\"a}sst jedoch zu w{\"u}nschen {\"u}brig. Die Gr{\"u}nde daf{\"u}r sind Bedenken bez{\"u}glich Datensicherheit und -vertraulichkeit in mandantenf{\"a}higen Systemen. Um diesem Problem zu begegnen, haben wir die Herausforderungen bei der Absicherung von mandantenf{\"a}higen Cloud Diensten untersucht, und den Umgang mit vertraulichem Schl{\"u}sselmaterial und Anmeldedaten als Schwachstelle identifiziert. Dieser Beitrag zeigt eine konzeptionelle L{\"o}sung zur zentralen Ablage und Zugriffsverwaltung sensibler Daten, sowie deren prototypische Implementierung innerhalb der IBM Cloud L{\"o}sung SmartCloud Content Management.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-12&engl=1}
}
@inproceedings {INPROC-2013-11,
   author = {Christoph Stach and Bernhard Mitschang},
   title = {{Privacy Management for Mobile Platforms - A Review of Concepts and Approaches}},
   booktitle = {Proceedings of the 14th International Conference on Mobile Data Management},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--9},
   type = {Conference Paper},
   month = {June},
   year = {2013},
   keywords = {privacy; profound overview; permission model},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The still rising popularity of modern mobile phones results in an increased demand for manifold applications for these devices. As Android OS supports the development and usage of third-party software greatly, there are more and more developers for this platform. However, many of those applications handle private data grossly negligent which immediately leads to serious privacy concerns. To make matters worse, the current Android permission rules are much too coarse and incomprehensible from the average user's perspective. But even if s/he understands the meaning of the permissions, s/he must either accept all of them or waive the application. Therefore we review concepts and approaches towards effective privacy management for mobile platforms. All this is discussed based on the prevailing key players in the mobile market, namely Apple, RIM, Microsoft and Google. As this work has been initiated by Google we mainly concentrated on Android-based concepts towards customizable privacy management approaches. As a result of our review and taking into account current initiatives and trends in the market, we come up with a novel approach, an implementation architecture and a prototype.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-11&engl=1}
}
@inproceedings {INPROC-2013-02,
   author = {Peter Reimann and Holger Schwarz},
   title = {{Datenmanagementpatterns in Simulationsworkflows}},
   booktitle = {Proceedings der 15. GI-Fachtagung Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2013)},
   editor = {Gesellschaft f{\"u}r Informatik (GI)},
   address = {Magdeburg},
   publisher = {Lecture Notes in Informatics (LNI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Gesellschaft f{\"u}r Informatik (GI)},
   pages = {279--293},
   type = {Conference Paper},
   month = {March},
   year = {2013},
   keywords = {Datenbereitstellung; Datenmanagementpatterns; Workflow; SIMPL; Simulationsworkflow; BPEL; WS-BPEL},
   language = {German},
   cr-category = {H.2.5 Heterogeneous Databases,     H.2.8 Database Applications,     H.4.1 Office Automation},
   contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Simulationsworkflows m{\"u}ssen oftmals gro{\ss}e Datenmengen verarbeiten, die in einer Vielzahl propriet{\"a}rer Formate vorliegen. Damit diese Daten von den im Workflow eingebundenen Programmen und Diensten verarbeitet werden k{\"o}nnen, m{\"u}ssen sie in passende Formate transformiert werden. Dies erh{\"o}ht die Komplexit{\"a}t der Workflowmodellierung, welche i.d.R. durch die Wissenschaftler selbst erfolgt. Dadurch k{\"o}nnen sich diese weniger auf den Kern der eigentlichen Simulation konzentrieren. Zur Behebung dieses Defizits schlagen wir einen Ansatz vor, mit dem die Aktivit{\"a}ten zur Datenbereitstellung in Simulationsabl{\"a}ufen abstrakt modelliert werden k{\"o}nnen. Wissenschaftler sollen keine Implementierungsdetails, sondern lediglich die Kernaspekte der Datenbereitstellung in Form von Patterns beschreiben. Die Spezifikation der Patterns soll dabei m{\"o}glichst in der Sprache der mathematischen Simulationsmodelle erfolgen, mit denen Wissenschaftler vertraut sind. Eine Erweiterung des Workflowsystems bildet die Patterns automatisch auf ausf{\"u}hrbare Workflowfragmente ab, welche die Datenbereitstellung umsetzen. Dies alles reduziert die Komplexit{\"a}t der Modellierung von Simulationsworkflows und erh{\"o}ht die Produktivit{\"a}t der Wissenschaftler.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-02&engl=1}
}
@inproceedings {INPROC-2012-38,
   author = {Carlos L{\"u}bbe and Nazario Cipriani},
   title = {{SimPl: A Simulation Platform for Elastic Load-Balancing in a Distributed Spatial Cache Overlay}},
   booktitle = {Proc. of the 13th International Conference on Mobile Data Management (MDM).},
   address = {Washington, DC, USA},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {0--4},
   type = {Conference Paper},
   month = {July},
   year = {2012},
   keywords = {load-balancing; simulation; spatial data; peer-to-peer},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   contact = {carlos.luebbe@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Location-based services (LBS) have to cope with increasing query loads at their data tier. Yet, the data access patterns of LBS typically possess spatial locality. Therefore, a dedicated spatial cache which provides efficient access to the data currently needed may considerably reduce this load. To ensure high throughput throughout the entire execution, previous work introduced an elastic load-balancing mechanism for multiple cache nodes that collaborate in a distributed spatial cache overlay. However, calibrating such a load-balancing mechanism is a non-trivial task, as several parameters influence such a system. We demonstrate a simulation platform (SimPl) for elastic load-balancing. SimPl enables a network administrator to set up several overlay topologies and calibrate their system parameters using different spatial data access patterns. A live visualization of the simulated overlay enables intuitive comparison of overlay topologies and their load-balancing abilities.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-38&engl=1}
}
@inproceedings {INPROC-2012-37,
   author = {Carlos L{\"u}bbe and Anja Reuter and Bernhard Mitschang},
   title = {{Elastic Load-Balancing in a Distributed Spatial Cache Overlay}},
   booktitle = {Proc. of the 13th International Conference on Mobile Data Management (MDM)},
   address = {Washington, DC, USA},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {0--10},
   type = {Conference Paper},
   month = {July},
   year = {2012},
   keywords = {load-balancing; caching; spatial data; peer-to-peer},
   language = {German},
   cr-category = {H.2.4 Database Management Systems},
   contact = {carlos.luebbe@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Location-based services (LBS) have gained enormous popularity, which imposes increasing query loads at the data tier of an LBS. Yet, the data access patterns of LBS typically possess high temporal and spatial locality. Therefore, a dedicated spatial cache which provides efficient access to the data currently needed may considerably reduce this load. To ensure high throughput, multiple cache nodes can collaborate in a distributed spatial cache overlay, which balances load among the nodes. However, load-balancing is a non-trivial task in this context, as load spreads unevenly in space and varies notably over time. This requires constant readjustment to shifting hot spots. We present an elastic load-balancing mechanism between cache nodes that is based on the physical model of a particle-spring system. Using spring contraction, nodes instantly form processing clusters in regions with high load and thus can easily work off accumulating queries. Our evaluation shows that our approach quickly adapts to rapidly changing hot spots and thereby ensures high throughput throughout the entire execution.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-37&engl=1}
}
@inproceedings {INPROC-2012-36,
   author = {Nazario Cipriani and Christoph Stach and Oliver D{\"o}rler and Bernhard Mitschang},
   title = {{NexusDSS - A System for Security Compliant Processing of Data Streams}},
   booktitle = {Proceedings of the First International Conference on Data Technologies and Applications (DATA 2012)},
   publisher = {SciTePress Digital Library},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--11},
   type = {Conference Paper},
   month = {July},
   year = {2012},
   language = {English},
   cr-category = {C.2.0 Computer-Communication Networks, General,     K.6.5 Security and Protection,     D.4.6 Operating Systems Security and Protection},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Technological advances in microelectronic and communication technology are increasingly leading to a highly connected environment equipped with sensors producing a continuous flow of context data. The steadily growing number of sensory context data available enables new application scenarios and drives new processing techniques. The growing pervasion of everyday life with social media and the possibility of interconnecting them with moving objects{\^a}€™ traces, leads to a growing importance of access control for this kind of data since it concerns privacy issues. The challenge in twofold: First mechanisms to control data access and data usage must be established and second efficient and flexible processing of sensible data must be supported. In this paper we present a flexible and extensible security framework which provides mechanisms to enforce requirements for context data access and beyond that support safe processing of sensible context data according to predefined processing rules. In addition and in contrast to previous concepts, our security framework especially supports fine-grained control to contextual data.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-36&engl=1}
}
@inproceedings {INPROC-2012-31,
   author = {Christoph Gr{\"o}ger and Johannes Schlaudraff and Florian Niedermann and Bernhard Mitschang},
   title = {{Warehousing Manufacturing Data. A Holistic Process Warehouse for Advanced Manufacturing Analytics}},
   booktitle = {Proceedings of the 14th International Conference on Data Warehousing and Knowledge Discovery - DaWaK 2012},
   editor = {Alfredo Cuzzocrea and Umeshwar Dayal},
   address = {Berlin, Heidelberg},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Computer Science},
   volume = {7448},
   pages = {142--155},
   type = {Conference Paper},
   month = {September},
   year = {2012},
   keywords = {Data Warehouse; Manufacturing; Process Optimization; Analytics; Business Intelligence; Data Integration},
   language = {English},
   cr-category = {H.2.7 Database Administration,     J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Strong competition in the manufacturing industry makes efficient and effective manufacturing processes a critical success factor. However, existing warehousing and analytics approaches in manufacturing are coined by substantial shortcomings, significantly preventing comprehensive process improvement. Especially, they miss a holistic data base integrating operational and process data, e. g., from Manufacturing Execution and Enterprise Resource Planning systems. To address this challenge, we introduce the Manufacturing Warehouse, a concept for a holistic manufacturing-specific process warehouse as central part of the overall Advanced Manufacturing Analytics Platform. We define a manufacturing process meta model and deduce a universal warehouse model. In addition, we develop a procedure for its instantiation and the integration of concrete source data. Finally, we describe a first proof of concept based on a prototypical implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-31&engl=1}
}
@inproceedings {INPROC-2012-28,
   author = {Stefan Silcher and Max Dinkelmann and Jorge Minguez and Bernhard Mitschang},
   title = {{A Service-based Integration for an improved Product Lifecycle Management}},
   booktitle = {Proceedings of the 14th International Conference on Enterprise Information Systems},
   editor = {Alfredo Cuzzocrea and Jos{\'e} Cordeiro Leszek Maciaszek},
   address = {Wroc\&\#322;aw, Poland},
   publisher = {INSTICC Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {38--47},
   type = {Conference Paper},
   month = {June},
   year = {2012},
   isbn = {978-989-8565-10-5},
   keywords = {Product Lifecycle Management; Service-oriented Architecture; Modular IT Integration},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The continuously changing environment is nowadays a major challenge for companies. The tough competition, growing customization of products and environmental regulations forces companies to continuously adapt their business processes. In order to manage the complexity and reduce the effort for developing products and production, many IT systems are indispensable. Despite Product Lifecycle Management Technology (PLM) the growing heterogeneous IT landscapes lack of a continuous support for business processes and get quickly unmanageable. In this paper PLM technology is extended by a service-based integration approach. Therefore, a modular service-based architecture was developed which will be presented in detail. The architecture describes how the whole product life cycle can be integrated more efficiently. The characteristics and findings of our approach are presented as well as a first prototype covering the production planning.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-28&engl=1}
}
@inproceedings {INPROC-2012-15,
   author = {Christoph Gr{\"o}ger and Florian Niedermann and Bernhard Mitschang},
   title = {{Data Mining-driven Manufacturing Process Optimization}},
   booktitle = {Proceedings of the World Congress on Engineering 2012 Vol III, WCE 2012, 4 – 6 July, 2012, London, U.K.},
   editor = {S. I. Ao and L. Gelman and D. W. L. Hukins and A. Hunter and A. M. Korsunsky},
   publisher = {Newswood},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1475--1481},
   type = {Conference Paper},
   month = {July},
   year = {2012},
   isbn = {978-988-19252-2-0},
   keywords = {Analytics; Data Mining; Decision Support; Process Optimization},
   language = {English},
   cr-category = {H.2.8 Database Applications,     J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {High competitive pressure in the global manufacturing industry makes efficient, effective and continuously improved manufacturing processes a critical success factor. Yet, existing analytics in manufacturing, e. g., provided by Manufacturing Execution Systems, are coined by major shortcomings considerably limiting continuous process improvement. In particular, they do not make use of data mining to identify hidden patterns in manufacturing-related data. In this article, we present indication-based and pattern-based manufacturing process optimization as novel data mining approaches provided by the Advanced Manufacturing Analytics Platform. We demonstrate their usefulness through use cases and depict suitable data mining techniques as well as implementation details.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-15&engl=1}
}
@inproceedings {INPROC-2012-14,
   author = {Christoph Gr{\"o}ger and Florian Niedermann and Holger Schwarz and Bernhard Mitschang},
   title = {{Supporting Manufacturing Design by Analytics. Continuous Collaborative Process Improvement enabled by the Advanced Manufacturing Analytics Platform}},
   booktitle = {Proceedings of the 2012 16th IEEE International Conference on Computer Supported Cooperative Work in Design (CSCWD), May 23-25, 2012, Wuhan, China},
   editor = {Liang Gao and Weiming Shen and Jean-Paul Barth{\`e}s and Junzhou Luo and Jianming Yong and Wenfeng Li and Weidong Li},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {793--799},
   type = {Conference Paper},
   month = {May},
   year = {2012},
   isbn = {978-1-4673-1210-3},
   keywords = {Analytics; Data Mining; Process Management; Manufacturing; Process Optimization},
   language = {English},
   cr-category = {H.2.8 Database Applications,     J.1 Administration Data Processing},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The manufacturing industry is faced with global competition making efficient, effective and continuously improved manufacturing processes a critical success factor. Yet, media discontinuities, the use of isolated analysis methods on local data sets as well as missing means for sharing analysis results cause a collaborative gap in Manufacturing Process Management that prohibits continuous process improvement. To address this chal-lenge, this paper proposes the Advanced Manufacturing Analytics (AdMA) Platform that bridges the gap by integrating operational and process manufacturing data, defining a reposito-ry for analysis results and providing indication-based and pat-tern-based optimization techniques. Both the conceptual architec-ture underlying the platform as well as its current implementa-tion are presented in this paper.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-14&engl=1}
}
@inproceedings {INPROC-2012-11,
   author = {Christoph Stach and Luiz Fernando Schlindwein},
   title = {{Candy Castle - A Prototype for Pervasive Health Games}},
   booktitle = {Proceedings of the 2012 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops); Lugano, Switzerland, March 19-23, 2012},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--4},
   type = {Demonstration},
   month = {March},
   year = {2012},
   keywords = {pervasive application; health game; health education; data analysis},
   language = {English},
   cr-category = {K.4 Computers and Society},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Serious games have primarily the function to educate and train, and secondly to entertain. We present a serious game used for the treatment of diabetes and for teaching a diabetes-aware lifestyle. The game encourages the player to walk around in his / her surrounding and check the blood sugar level in as many different places as possible. Undoubtedly, the special feature of Candy Castle is our feedback loop which can be used for on-the-fly data analysis and automatic adaptation of the application. Thus, the patients as well as their doctors can be automatically alerted if their blood values deteriorate. In this demo paper, we explain both the design of the game as well as some interesting implementation aspects of our prototype. Even though we concern just on the topic of mobile games, all introduced techniques can be transferred to a general setting and used in any other mobile application.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-11&engl=1}
}
@inproceedings {INPROC-2011-87,
   author = {Jorge Minguez and Florian Niedermann and Bernhard Mitschang},
   title = {{A provenance-aware service repository for EAI process modeling tools}},
   booktitle = {IEEE International Conference on Information Reuse and Integration 2011 (IRI '11)},
   address = {Las Vegas},
   publisher = {IEEE Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {42--47},
   type = {Conference Paper},
   month = {August},
   year = {2011},
   doi = {10.1109/IRI.2011.6009518},
   keywords = {EAI process modeling tool; business process; business service; data interoperability; enterprise application integration; functional interoperability; manufacturing domain; process lifecycle management; provenance aware service repository; provenance data model; provenance subscription capabilities; service engineering methods; service knowledge base; service reusability; business data processing; knowledge based systems; manufacturing industries; open systems},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {One of the major challenges for Enterprise Application Integration (EAI) process modeling tools is the continuous adaptation of the business processes and services. Business and IT specialists are both confronted with a number of problems involved in the adaptation of such processes, such as the lack of support for process lifecycle management, data and functional interoperability problems or the appropriate service knowledge base. Currently, most service engineering methods adopt a lifecycle strategy for the design, implementation, deployment and evaluation of services. However, enterprises exploiting service reusability lack the knowledge on process dependencies across the entire service lifecycle. This knowledge is required by process modeling tools in order to keep EAI processes loosely-coupled. Using a provenance data model we describe the different types of service dependencies in EAI processes with regard to the service changes across its lifecycle. We present a provenance-aware service repository with provenance subscription capabilities and its adoption for different use cases in the manufacturing domain.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-87&engl=1}
}
@inproceedings {INPROC-2011-86,
   author = {Nazario Cipriani and Oliver Schiller and Bernhard Mitschang},
   title = {{M-TOP: Multi-target Operator Placement of Query Graphs for Data Streams}},
   booktitle = {Proceedings of the 15th International Database Engineering and Applications Symposium (IDEAS 2011)},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {52--60},
   type = {Conference Paper},
   month = {September},
   year = {2011},
   language = {English},
   cr-category = {G.1.6 Numerical Analysis Optimization,     C.2.3 Network Operations},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays, many applications processes stream-based data, such as financial market analysis, network intrusion detection, or visualization applications. To process stream-based data in an applicationindependent manner, distributed stream processing systems emerged. They typically translate a query to an operator graph, place the operators to stream processing nodes, and execute them to process the streamed data. The operator placement is crucial in such systems, as it deeply influences query execution. Often, different stream-based applications require dedicated placement of query graphs according to their specific objectives, e.g. bandwidth not less than 500 MBit/s and costs not more that 1 cost unit. This fact constraints operator placement. Existing approaches do not take into account application-specific objectives, thus not reflecting application-specific placement decisions. As objectives might conflict among each other, operator placement is subject to delicate trade-offs, such as bandwidth maximization is more important than cost reduction. Thus, the challenge is to find a solution which considers the application-specific objectives and their trade-offs. We present M-TOP, an QoS-aware multi-target operator placement framework for data stream systems. Particularly, we propose an operator placement strategy considering application-specific targets consisting of objectives, their respective trade-offs specifications, bottleneck conditions, and ranking schemes to compute a suitable placement. We integrated M-TOP into NexusDS, our distributed data stream processing middleware, and provide an experimental evaluation to show the effectiveness of M-TOP.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-86&engl=1}
}
@inproceedings {INPROC-2011-85,
   author = {Nazario Cipriani and Matthias Grossmann and Harald Sanftmann and Bernhard Mitschang},
   title = {{Design Considerations of a Flexible Data Stream Processing Middleware}},
   booktitle = {Proceedings of the 15th East-European Conference on Advances in Databases and Information Systems (ADBIS 2011)},
   publisher = {CEUR-WS.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {222--231},
   type = {Conference Paper},
   month = {September},
   year = {2011},
   language = {German},
   cr-category = {K.6.1 Project and People Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Techniques for efficient and distributed processing of huge, unbound data streams have made some impact in the database community. Distributed data stream processing systems have emerged providing a distributed environment to process these potentially unbound streams of data by a set of processing nodes. A wide range of realtime applications process stream-based data. Sensors and data sources, such as position data of moving objects, continuously produce data that is consumed by, e.g., location-aware applications. Depending on the domain of interest, the processing of such data often depends on domain-specific functionality. For instance, an application which visualizes stream-based data has stringent timing constraints, or may even need a specific hardware environment to smoothly process the data. Furthermore, users may add additional constraints. E.g., for security reasons they may want to restrict the set of nodes that participates in processing. In this paper we review context-aware applications which, despite their different application fields, share common data processing principles. We analyse these applications and extract common requirements which data stream processing systems must meet to support these applications. Finally, we show how such applications are implemented using NexusDS, our extensible stream processing middleware.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-85&engl=1}
}
@inproceedings {INPROC-2011-64,
   author = {Michael Abel and Peter Klemm and Stefan Silcher and Jorge Minguez},
   title = {{Start-Up of Reconfigurable Production Machines with a Service-Oriented Architecture}},
   booktitle = {Proceedings of the 21st International Conference on Production Research},
   publisher = {Fraunhofer IAO},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--5},
   type = {Conference Paper},
   month = {August},
   year = {2011},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Starting-up production machines takes a considerable part of time and development expenses. Especially in the case of reconfigurable machines a short start-up phase is essential. Many activities, which are necessary during the start-up, can be automated. These are the configuration of mechatronic modules, control- and fieldbus systems as well as the extensive testing of functions. This paper presents an approach based on a service- oriented architecture (SOA) to automate the start-up of a reconfigurable production machine. Functionality for configuration and start-up is provided by an internal middleware system. The sequence control for the startup process is realised within a configuration system. A new approach to the combination of field-bus and middleware communication infrastructure is used to adopt SOA paradigms to existing automation technology. Thus, real-time communication can be combined with flexible communication for the automatic configuration of production machines.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-64&engl=1}
}
@inproceedings {INPROC-2011-57,
   author = {Andreas Brodt and Oliver Schiller and Bernhard Mitschang},
   title = {{Efficient resource attribute retrieval in RDF triple stores}},
   booktitle = {Proceeding of the 20th ACM conference on Information and knowledge management (CIKM)},
   publisher = {Association for Computing Machinery (ACM)},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {October},
   year = {2011},
   keywords = {RDF; SPARQL},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.2 Database Management Physical Design},
   contact = {andreas.brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The W3C Resource Description Framework (RDF) is gaining popularity for its ability to manage semi-structured data without a predefined database schema. So far, most RDF query processors have concentrated on finding complex graph patterns in RDF, which typically involves a high number of joins. This works very well to query resources by the relations between them. Yet, obtaining a record-like view on the attributes of resources, as natively supported by RDBMS, imposes unnecessary performance burdens, as the individual attributes must be joined to assemble the final result records. We present an approach to retrieve the attributes of resources efficiently. We first determine the resources in question and then retrieve all their attributes efficiently at once, exploiting contiguous storage in RDF indexes. In addition, we present an index structure which is specifically designed for RDF attribute retrieval. In a performance evaluation we show that our approach is clearly superior for larger numbers of retrieved attributes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-57&engl=1}
}
@inproceedings {INPROC-2011-42,
   author = {Jorge Minguez and Peter Reimann and Sema Zor},
   title = {{Event-driven Business Process Management in Engineer-to-Order Supply Chains}},
   booktitle = {Proceedings of the 15th International Conference on Computer Supported Cooperative Work in Design},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {Event-driven Architecture; Service-oriented Architecture; SOA; EDA; Engineer-to-Order; ETO; Supply chain},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Integration efforts in today’s manufacturing environments tend to enable service-based communication interfaces between enterprise and manufacturing systems. Constantly changing business conditions demand a high level of flexibility in business processes as well as an adaptive and fully interoperable IT infrastructure. The principles of reusability and loosely-coupled services have driven Service Oriented Architecture (SOA) to become the most used paradigm for software design at the business level. In a manufacturing environment, event-driven architectures (EDA) are often employed for managing information flows across different production systems. The timely propagation of business-relevant events is a fundamental requirement in Engineer-to-Order (ETO) enterprises, which require a high level of transparency in their supply chains. Agility is one of the top priorities for ETO manufacturers in order to react to turbulent scenarios. Therefore, the main challenge for ETO supply chains is to identify and propagate events across the ETO logistics network and integrate these into the manufacturer business processes. We present how an existing service-oriented integration platform for manufacturing can be used to fill the gap between EDA-based manufacturing environments of an ETO supply chain and SOA-based manufacturer business processes. In this paper, we discuss the benefits of the Business Process Execution Language (BPEL) as vehicle for this integration. The adoption of BPEL will enable an efficient and effective reaction to turbulent manufacturing scenarios in an ETO supply chain.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-42&engl=1}
}
@inproceedings {INPROC-2011-41,
   author = {Jorge Minguez and David Baureis and Donald Neumann},
   title = {{Providing Coordination and Goal Definition in Product-Service Systems through Service-oriented Computing}},
   booktitle = {Proceedings of the 44th CIRP International Conference on Manufacturing Systems},
   publisher = {CIRP},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {7--12},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {Manufacturing; Product-Service Systems, PSS, Service-oriented Architecture, SOA},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Product-Service Systems (PSS) are a strategic approach that offers manufacturing companies the possibility of long-term differentiation against competitors by integrating goods and services. The implementation of a PSS entails challenges for the resulting supply chain structure and the IT infrastructure supporting coordinated service offerings, such as conflicting goals and coordination in the integrated business processes. The Service-oriented Architecture (SOA) paradigm, based on loosely-coupled components, provides rapid reconfiguration of business processes, rapid integration of services and goal definition through service level agreements. This paper presents a PSS service analysis methodology, which supports coordination and definition of goals in heterogeneous supply chains.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-41&engl=1}
}
@inproceedings {INPROC-2011-40,
   author = {Jorge Minguez and Stefan Silcher and Bernhard Mitschang and Engelbert Westk{\"a}mper},
   title = {{Towards Intelligent Manufacturing: Equipping SOA-based Architectures with advanced SLM Services}},
   booktitle = {Proceedings of the 44th CIRP International Conference on Manufacturing Systems},
   publisher = {CIRP},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {Service Oriented Architecture; Manufacturing; Service Lifecycle Management; SOA; SLM; Adaptability; Wandlungsf{\"a}higkeit},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The vision of knowledge-based and intelligent manufacturing systems is driving the development of system architectures, which can seamlessly manage information flows across multiple heterogeneous manufacturing systems and provide the necessary services to support the execution of production processes. Constantly changing business conditions and turbulent scenarios force manufacturing companies to continuously adapt their business processes and manufacturing systems. In such a context, a flexible infrastructure that supports the full integration of processes and adapts its services is needed. This paper presents an innovative semantic service framework that enables the adoption of service lifecycle management (SLM) in an SOA-based integration framework.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-40&engl=1}
}
@inproceedings {INPROC-2011-39,
   author = {Stefan Silcher and Jorge Minguez and Bernhard Mitschang},
   title = {{Adopting the Manufacturing Service Bus in a Service-based Product Lifecycle Management Architecture}},
   booktitle = {Proceedings of the 44th International CIRP Conference on Manufacturing Systems: ICMS '11; Madison, Wisconsin, USA, May 31 - June 3, 2011},
   publisher = {Online},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {Information; System Architecture; Product Lifecycle Management; Service Oriented Architecture; Enterprise Service Bus},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Service-oriented computing is nowadays a rising technology to implement business processes in an efficient and flexible manner. This technology has a great impact on manufacturing environments. The realization of Product Lifecycle Management (PLM) with a Service Oriented Architecture (SOA) has many benefits. Some advantages are a seamless and flexible integration of all applications within PLM, including legacy systems, improved data provisioning and a reduced complexity by using a common service-based integration middleware, such as the Manufacturing Service Bus (MSB). In this paper the integration of the MSB into the service-oriented PLM approach will be described in detail.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-39&engl=1}
}
@inproceedings {INPROC-2011-37,
   author = {Sylvia Radesch{\"u}tz and Marko Vrhovnik and Holger Schwarz and Bernhard Mitschang},
   title = {{Exploiting the Symbiotic Aspects of Process and Operational Data for Optimizing Business Processes}},
   booktitle = {Proc. of the 12th IEEE International Conference on Information Reuse and Integration (IRI 2011)},
   address = {Las Vegas, USA},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {August},
   year = {2011},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {A profound analysis of all relevant business data in a company is necessary for optimizing business processes effectively. Current analyses typically run either on business process execution data or on operational business data. Correlations among the separate data sets have to be found manually under big effort. However, to achieve a more informative analysis and to fully optimize a company’s business, an efficient consolidation of all major data sources is indispensable. Recent matching algorithms are insufficient for this task since they are restricted either to schema or to process matching. We present a new matching framework to combine process data models and operational data models (semi-)automatically for performing such a profound business analysis. We describe this approach and its basic matching rules as well as an experimental study that shows the achieved high recall and precision.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-37&engl=1}
}
@inproceedings {INPROC-2011-36,
   author = {Oliver Schiller and Benjamin Schiller and Andreas Brodt and Bernhard Mitschang},
   title = {{Native support of multi-tenancy in RDBMS for software as a service}},
   booktitle = {EDBT},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {117--128},
   type = {Conference Paper},
   month = {January},
   year = {2011},
   language = {English},
   cr-category = {H.2.1 Database Management Logical Design,     H.2 Database Management},
   ee = {http://doi.acm.org/10.1145/1951365.1951382},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Software as a Service (SaaS) facilitates acquiring a huge number of small tenants by providing low service fees. To achieve low service fees, it is essential to reduce costs per tenant. For this, consolidating multiple tenants onto a single relational schema instance turned out beneficial because of low overheads per tenant and scalable man- ageability. This approach implements data isolation between ten- ants, per-tenant schema extension and further tenant-centric data management features in application logic. This is complex, dis- ables some optimization opportunities in the RDBMS and repre- sents a conceptual misstep with Separation of Concerns in mind. Therefore, we contribute first features of a RDBMS to support tenant-aware data management natively. We introduce tenants as first-class database objects and propose the concept of a tenant con- text to isolate a tenant from other tenants. We present a schema inheritance concept that allows sharing a core application schema among tenants while enabling schema extensions per tenant. Fi- nally, we evaluate a preliminary implementation of our approach.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-36&engl=1}
}
@inproceedings {INPROC-2011-27,
   author = {Nazario Cipriani and Carlos L{\"u}bbe and Oliver D{\"o}rler},
   title = {{NexusDSEditor - Integrated Tool Support for the Data Stream Processing Middleware NexusDS}},
   booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW), 14. Fachtagung des GI-Fachbereichs ``Datenbanken und Informationssysteme'' (DBIS), 2.-4.3.2011 in Kaiserslautern, Germany},
   editor = {Theo H{\"a}rder and Wolfgang Lehner and Bernhard Mitschang and Harald Sch{\"o}ning and Holger Schwarz},
   publisher = {Lecture Notes in Informatics (LNI)},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Gesellschaft f{\"u}r Informatik (GI)},
   volume = {180},
   pages = {714--717},
   type = {Conference Paper},
   month = {March},
   year = {2011},
   isbn = {978-3-88579-274-1},
   language = {English},
   cr-category = {D.2.6 Software Engineering Programming Environments,     H.5.2 Information Interfaces and Presentation User Interfaces},
   contact = {nazario.cipriani@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper we present NexusDSEditor --- an integrated tool for the stream processing middleware NexusDS. NexusDSEditor is an extension module for the NexusEditor and supports developers with designing new streaming applications by providing an integrated tool for orchestrating stream query graphs, define the deployment of query graph fragments to execution nodes, and analyzing data streams. In this paper we demonstrate these single steps and show how NexusDSEditor supports developing streaming data applications for the NexusDS platform by hiding complexity and providing an intuitive user interface.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-27&engl=1}
}
@inproceedings {INPROC-2011-26,
   author = {Florian Niedermann and Sylvia Radesch{\"u}tz and Bernhard Mitschang},
   title = {{Design-Time Process Optimization through Optimization Patterns and Process Model Matching}},
   booktitle = {Proceedings of the 12th IEEE Conference on Commerce and Enterprise Computing (CEC)},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {48--55},
   type = {Conference Paper},
   month = {November},
   year = {2011},
   keywords = {Business Process Analytics; Business Process Design; Business Process Management; Business Process Optimization; Process Model Matching},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5708392},
   contact = {florian.niedermann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The goal of process design is the construction of a process model that is a priori optimal w.r.t. the goal(s) of the business owning the process. Process design is therefore a major factor in determining the process performance and ultimately the success of a business. Despite this importance, the designed process is often less than optimal. This is due to two major challenges: First, since the design is an a priori ability, no actual execution data is available to provide the foundations for design decisions. Second, since modeling decision support is typically basic at best, the quality of the design largely depends on the ability of business analysts to make the ”right” design choices. To address these challenges, we present in this paper our deep Business Optimization Platform that enables (semi-) automated process optimization during process design based on actual execution data. Our platform achieves this task by matching new processes to existing processes stored in a repository based on similarity metrics and by using a set of formalized best-practice process optimization patterns.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-26&engl=1}
}
@inproceedings {INPROC-2011-25,
   author = {Florian Niedermann and Holger Schwarz},
   title = {{Deep Business Optimization: Making Business Process Optimization Theory Work in Practice}},
   booktitle = {Proceedings of the Conference on Business Process Modeling, Development and Support (BPMDS 2011)},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {Business Process Optimization, Optimization Techniques, Business Process Analytics, Data Mining, Tool Support},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2011-25/INPROC-2011-25.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The success of most of today's businesses is tied to the efficiency and effectiveness of their core processes. This importance has been recognized in research, leading to a wealth of sophisticated process optimization and analysis techniques. Their use in practice is, however, often limited as both the selection and the application of the appropriate techniques are challenging tasks. Hence, many techniques are not considered causing potentially significant opportunities of improvement not to be implemented. This paper proposes an approach to addressing this challenge using our deep Business Optimization Platform. By integrating a catalogue of formalized optimization techniques with data analysis and integration capabilities, it assists analysts both with the selection and the application of the most fitting optimization techniques for their specific situation. The paper presents both the concepts underlying this platform as well as its prototypical implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-25&engl=1}
}
@inproceedings {INPROC-2011-24,
   author = {Florian Niedermann and Bernhard Maier and Sylvia Radesch{\"u}tz and Holger Schwarz and Bernhard Mitschang},
   title = {{Automated Process Decision Making based on Integrated Source Data}},
   booktitle = {Proceedings of the 14th International Conference on Business Information Systems (BIS 2011)},
   editor = {Witold Abramowicz},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Business Information Processing},
   pages = {1--10},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {Data Mining, Decision Automation, Data Integration, Business Process Management, Data-driven Processes},
   language = {English},
   cr-category = {H.4.1 Office Automation,     H.2.8 Database Applications,     H.5.2 Information Interfaces and Presentation User Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The success of most of today's businesses is tied to the efficiency and effectiveness of their core processes. Yet, two major challenges often prevent optimal processes: First, the analysis techniques applied during the optimization are inadequate and fail to include all relevant data sources. Second, the success depends on the abilities of the individual analysts to spot the right designs amongst a plethora of choices. Our deep Business Optimization Platform addresses these challenges through specialized data integration, analysis and optimization facilities. In this paper, we focus on how it uses formalized process optimization patterns for detecting and implementing process improvements.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-24&engl=1}
}
@inproceedings {INPROC-2011-23,
   author = {Florian Niedermann and Sylvia Radesch{\"u}tz and Bernhard Mitschang},
   title = {{Business Process Optimization using Formalized Optimization Patterns}},
   booktitle = {Proceedings of the 14th International Conference on Business Information Systems (BIS 2011)},
   editor = {Witold Abramowicz},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {Business Process Management; Business Process Optimization},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   contact = {florian.niedermann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The success of most of today's businesses is tied to the efficiency and effectiveness of their core processes. Yet, two major challenges often prevent optimal processes: First, the analysis techniques applied during the optimization are inadequate and fail to include all relevant data sources. Second, the success depends on the abilities of the individual analysts to spot the right designs amongst a plethora of choices. Our deep Business Optimization Platform addresses these challenges through specialized data integration, analysis and optimization facilities. In this paper, we focus on how it uses formalized process optimization patterns for detecting and implementing process improvements.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-23&engl=1}
}
@inproceedings {INPROC-2011-20,
   author = {Carlos L{\"u}bbe and Andreas Brodt and Nazario Cipriani and Matthias Gro{\ss}mann and Bernhard Mitschang},
   title = {{DiSCO: A Distributed Semantic Cache Overlay for Location-based Services}},
   booktitle = {Proceedings of the 2011 Twelfth International Conference on Mobile Data Management},
   address = {Washington, DC, USA},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {January},
   year = {2011},
   keywords = {peer-to-peer; semantic caching},
   language = {German},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems},
   contact = {carlos.luebbe@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Location-based services (LBS) have gained tremendous popularity with millions of simultaneous users daily. LBS handle very large data volumes and face enormous query loads. Both the data and the queries possess high locality: spatial data is distributed very unevenly around the globe, query load is different throughout the day, and users often search for similar things in the same places. This causes high load peaks at the data tier of LBS, which may seriously degrade performance. To cope with these load peaks, we present DiSCO, a distributed semantic cache overlay for LBS. DiSCO exploits the spatial, temporal and semantic locality in the queries of LBS and distributes frequently accessed data over many nodes. Based on the Content-Addressable Network (CAN) peer-to-peer approach, DiSCO achieves high scalability by partitioning data using spatial proximity. Our evaluation shows that DiSCO significantly reduces queries to the underlying data tier.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-20&engl=1}
}
@inproceedings {INPROC-2011-17,
   author = {Christoph Stach and Andreas Brodt},
   title = {{– vHike – A Dynamic Ride-sharing Service for Smartphones}},
   booktitle = {Proceedings of the 12th international conference on Mobile data management},
   address = {Lule{\aa}, Sweden},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   keywords = {ride-sharing; trust; security; location-based.},
   language = {English},
   cr-category = {K.4 Computers and Society},
   contact = {Senden Sie eine E-Mail an christoph.stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In times of lacking natural resources and increasing environmental pollution at the same time, modern resource efficient kinds of personal transportation have to be considered. Ride-sharing is maybe one of the most economical ways to avouch permanent mobility without losing too much comfort. However, especially dynamic ride-sharing is laden with many resistances including a lack of security and a heavy scheduling and coordinating burden. Hence this paper introduces an implementation of a system for dynamic ride-sharing called vHike which should eliminate these barriers. With our demonstrator every interested participant may test whether or not such a system can be viable and effective.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-17&engl=1}
}
@inproceedings {INPROC-2011-16,
   author = {Andreas Brodt and Oliver Schiller and Sailesh Sathish and Bernhard Mitschang},
   title = {{A mobile data management architecture for interoperability of resource and context data}},
   booktitle = {Proceedings of the 2011 Twelveth International Conference on Mobile Data Management},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {June},
   year = {2011},
   language = {English},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,     H.3.5 Online Information Services,     H.2.4 Database Management Systems},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2011-16/INPROC-2011-16.pdf},
   contact = {brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Mobile devices have become general-purpose computers that are equipped with sensors, constantly access the internet, and almost always accompany the user. Consequently, devices manage many different kinds of data about the user's life and context. There is considerable overlap in this data, as different applications handle similar data domains. Applications often keep this data in separated data silos. Web applications, which manage large amounts of personal data, hardly share this data with other applications at all. This lack of interoperability creates redundancy and impacts usability of mobile devices. We present a data management architecture for mobile devices to support interoperability between applications, devices and web applications at the data management level. We propose a central on-device repository for applications to share resource and context data in an integrated, extensible data model which uses semantic web technologies and supports location data. A web browser interface shares data with web applications, as controlled by a general security model.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-16&engl=1}
}
@inproceedings {INPROC-2011-07,
   author = {Peter Reimann and Michael Reiter and Holger Schwarz and Dimka Karastoyanova and Frank Leymann},
   title = {{SIMPL - A Framework for Accessing External Data in Simulation Workflows}},
   booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2011), 14. Fachtagung des GI-Fachbereichs „Datenbanken und Informationssysteme“ (DBIS), Proceedings, 02.-04. M{\"a}rz 2011, Kaiserslautern, Germany},
   editor = {Gesellschaft f{\"u}r Informatik (GI)},
   publisher = {Lecture Notes in Informatics (LNI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Series of the Gesellschaft f{\"u}r Informatik (GI)},
   volume = {180},
   pages = {534--553},
   type = {Conference Paper},
   month = {March},
   year = {2011},
   isbn = {978-3-88579-274-1},
   keywords = {Data Provisioning; Workflow; Scientific Workflow; Simulation Workflow; BPEL; WS-BPEL; SIMPL},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.4.1 Office Automation},
   contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Adequate data management and data provisioning are among the most important topics to cope with the information explosion intrinsically associated with simulation applications. Today, data exchange with and between simulation applications is mainly accomplished in a file-style manner. These files show proprietary formats and have to be transformed according to the specific needs of simulation applications. Lots of effort has to be spent to find appropriate data sources and to specify and implement data transformations. In this paper, we present SIMPL – an extensible framework that provides a generic and consolidated abstraction for data management and data provisioning in simulation workflows. We introduce extensions to workflow languages and show how they are used to model the data provisioning for simulation workflows based on data management patterns. Furthermore, we show how the framework supports a uniform access to arbitrary external data in such workflows. This removes the burden from engineers and scientists to specify low-level details of data management for their simulation applications and thus boosts their productivity.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-07&engl=1}
}
@inproceedings {INPROC-2011-06,
   author = {Christoph Stach},
   title = {{Saving time, money and the environment - vHike a dynamic ride-sharing service for mobile devices}},
   booktitle = {Work in Progress workshop at PerCom 2011 (WIP of PerCom 2011)},
   address = {Seattle, USA},
   publisher = {IEEE},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {March},
   year = {2011},
   keywords = {ride-sharing; trust; security; location-based},
   language = {English},
   cr-category = {K.4 Computers and Society},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In times of increasing traffic-related problems, such as air-pollution or traffic jams, ride-sharing is one of the most environmentally friendly and pleasantest ways to travel. The many benefits are offset by a multitude of prejudices and fears, including security concerns and a heavy scheduling and coordinating burden. For this reason this paper introduces vHike an easy-to-use management system for dynamic ridesharing running on modern Smartphones. By the use of techniques well-known from Web 2.0 social networks the threats and social discomfort emanated by ride-sharing is mitigated. With vHike we want to show that a proper designed social dynamic ride-sharing system can be feasible and viable.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-06&engl=1}
}
@inproceedings {INPROC-2010-89,
   author = {Florian Niedermann and Sylvia Radesch{\"u}tz and Bernhard Mitschang},
   title = {{Deep Business Optimization: A Platform for Automated Process Optimization}},
   booktitle = {Business Process and Service Science - Proceedings of ISSS and BPSC: BPSC'10; Leipzig, Germany, September 27th - October 1st, 2010},
   editor = {Witold Abramowicz and Rainer Alt and Klaus-Peter F{\"a}ndrich and Bogdan Franczyk and Leszek A Maciaszek},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Informatics},
   volume = {P177},
   pages = {168--180},
   type = {Conference Paper},
   month = {September},
   year = {2010},
   isbn = {978-3-88579-271-0},
   language = {English},
   cr-category = {H.4.1 Office Automation,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The efficient and effective design, execution and adaption of its core processes is vital for the success of most businesses and a major source of competitive advantage. Despite this critical importance, process optimization today largely depends on manual analytics and the ability of business analysts to spot the ``right'' designs and areas of improvement. This is because current techniques typically fall short in three areas: They fail to integrate relevant data sources, they do not provide optimal analytical procedures and they leave it up to the analyst to identify the best process design. Hence, we propose in this paper a platform that enables (semi-)automated process optimization during the process design, execution and analysis stage, based on insights from specialized analytical procedures running on an integrated warehouse containing both process and operational data. We further detail the analysis stage, as it provides the foundation for all other optimization stages.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-89&engl=1}
}
@inproceedings {INPROC-2010-87,
   author = {Carlos L{\"u}bbe},
   title = {{Nexus VIS: Ein verteiltes Visualisierungstoolkit f{\"u}r mobile Anwendungen}},
   booktitle = {6. GI/ITG KuVS Fachgespr{\"a}ch {\"O}rtsbezogene Anwendungen und Dienste``},
   editor = {Alexander Zipf and Sandra Lanig and Michael Bauer},
   address = {Heidelberg},
   publisher = {Selbstverlag des Geographischen Instituts der Universit{\"a}t Heidelberg},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Heidelberger Geographische Bausteine},
   volume = {18},
   pages = {109--118},
   type = {Workshop Paper},
   month = {September},
   year = {2010},
   isbn = {987-3-88570-818-6},
   language = {German},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Mobile Anwendungen visualisieren h{\"a}ufig Daten der n{\"a}heren Umgebung, die entweder als Fakten in ortsbasierten Datenbanken eingetragen sind, oder von Sensoren kontinuierlich geliefert werden. Dies erfordert sowohl Funktionalit{\"a}t aus der Daten- und Datenstromverarbeitung als auch spezifische Visualisierungsfunktionalit{\"a}t, welche weder Visualisierungswerkzeuge noch Datenstromverarbeitungssysteme in kombinierter Form anbieten. Bei der Ausf{\"u}hrung von Visualisierungsprozessen in einem heterogenen, verteilten Umfeld m{\"u}ssen Ger{\"a}te verschiedenster Eigenschaften ber{\"u}cksichtigt werden. Beispielsweise k{\"o}nnten resourcenbeschr{\"a}nkte Ger{\"a}te eine serverseitige Verarbeitung von ressourcenintensiven Aufgaben erfordern, w{\"a}hrend leistungsst{\"a}rkere Ger{\"a}te diese Aufgaben lokal erledigen k{\"o}nnten. Andererseits k{\"o}nnte eine bestimmte Aufgabe, wie zum Beispiel die Erzeugung eines Bildes aus einem r{\"a}umlichen Modell, f{\"u}r die Ausf{\"u}hrung auf einem Ger{\"a}t eine gewisse Hardwareaustattung voraussetzen, wie etwa eine Graphics Processing Unit (GPU). Um die Eigenschaften der verwendeten Ger{\"a}te optimal auszunutzen, ist eine flexible, verteilte Verarbeitungsarchitektur w{\"u}nschenswert. In dieser Arbeit pr{\"a}sentieren wir Nexus VIS, ein flexibles Visualisierungstoolkit f{\"u}r kontextbasierte Anwendungen. Durch Erweiterung des Datenstromverarbeitungssystems NexusDS um spezifische Visualisierungsoperatoren erm{\"o}glichen wir es den Anwendungen, den Visualisierungsprozess als kontinuierliche Anfrage auszuf{\"u}hren und somit Datenstromverarbeitung und Visualisierung zu kombinieren. Dar{\"u}ber hinaus er{\"o}ffnet NexusDS als verteiltes Datenstromverarbeitungssystem eine Vielzahl von m{\"o}glichen Ausf{\"u}hrungsszenarien, bei denen die unterschiedlichen Eigenschaften der Ger{\"a}te ber{\"u}cksichtigt werden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-87&engl=1}
}
@inproceedings {INPROC-2010-83,
   author = {David Baureis and Donald Neumann and Jorge Minguez},
   title = {{From a Product to a Product Service Supply Chain: A strategic Roadmap}},
   booktitle = {Proceedings of the 12th International MITIP Conference: The Modern Information Technology in the Innovation Processes of the Industrial Enterprises, Aalborg, Denmark, August 29-31, 2010,},
   publisher = {MITIP},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {148--156},
   type = {Conference Paper},
   month = {August},
   year = {2010},
   language = {English},
   cr-category = {A.0 General Literature, General},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Product-service systems (PSS) have been claimed as an interesting strategy for reaching sustainable differentiation. Migrating from a manufacturing company to a solution provider through PSS offerings raises different challenges, especially for the supply chain. This paper describes a road-map that helps a manufacturing organization to: 1. evaluate a PSS as a strategic choice; 2. define the service part of the product-service bundle and; 3. delineate the most important supply chain design variables.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-83&engl=1}
}
@inproceedings {INPROC-2010-82,
   author = {Christoph Stach},
   title = {{Gamework - A customizable framework for pervasive games (Doctoral Colloquium)}},
   booktitle = {ICPS '10: Proceedings of the 7th international conference on Pervasive services; Berlin, Germany, July 13 - 15, 2010},
   editor = {Christian Becker and Shonali Krishnaswamy and Gergely Zaruba and Dipanjan Chakraborty and Mika Luimula and Jadwiga Indulska and Mohamed Medhat Gaber and Seng Wai Loke and Waluyo Agustinus Borgy},
   publisher = {ACM Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {ACM International Conference Proceeding Series},
   pages = {168--173},
   type = {Conference Paper},
   month = {July},
   year = {2010},
   isbn = {978-1-4503-0249-4},
   keywords = {Mobile services, pervasive multi-player games; customizable framework},
   language = {English},
   cr-category = {D.2.13 Software Engineering Reusable Software,     H.2.8 Database Applications,     K.8 Personal Computing},
   contact = {Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Location-based applications and services gain in importance as the spread of mobile devices equipped with GPS sensors and internet capabilities increases. Moreover, there is a trend towards customizable applications in order to let the user determine e.g. the content and the look and feel. Nevertheless, there exist only a few applications combining these features. In this paper, we propose Gamework, a framework for customizable mobile location-based games as a specialization for customizable mobile context-aware applications and services. According to their programming skills players are able to adapt a game with Gamework. This can be done by changing the context, adding user-generated content, modifying the game-flow or implementing new games from scratch by reusing existing modules of the framework or adding new ones. Therefore our framework features a reuse-oriented development methodology as well as a feedback loop analyzing all accruing user-generated content. The results of this analysis are used to automatically optimize the game with respect to frequent user-feedback. Finally, we will transfer the results back to the more general area of mobile and context-aware applications and services.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-82&engl=1}
}
@inproceedings {INPROC-2010-79,
   author = {Stefan Silcher and Jorge Minguez and Thorsten Scheibler and Bernhard Mitschang},
   title = {{A Service-Based Approach for Next-Generation Product Lifecycle Management}},
   booktitle = {Proceedings of the 11th IEEE International Conference on Information Reuse and Integration (IEEE IRI 2010) in Las Vegas, Nevada, USA.},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {219--224},
   type = {Conference Paper},
   month = {August},
   year = {2010},
   isbn = {978-1-4244-8098-2},
   keywords = {Product Lifecycle Management; PLM; Service Oriented Architecture; SOA; Enterprise Service Bus; ESB},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays, one of the main challenges for companies is the effective management of IT-systems. In times where requirements and companies change steadily, the ITinfrastructure has to adopt these changes as well: new systems have to be integrated or existing adapted. Even worse, these systems work together to support business processes of a company and, thus, the infrastructures becomes complex and difficult to manage. The same situation is true for Product Lifecycle Management (PLM) that accompanies a product development by means of interconnected IT systems running on complex IT infrastructures. This paper introduces a viable solution to the integration of all phases of PLM. An Enterprise Service Bus (ESB) is employed as the service-based integration and communication infrastructure. Three exemplary scenarios are introduced to describe the benefits of using an ESB as compared to alternative PLM infrastructures. Furthermore, we introduce a service hierarchy to enable value-added services to enhance PLM functionality.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-79&engl=1}
}
@inproceedings {INPROC-2010-45,
   author = {Jorge Minguez and Dominik Lucke and Mihaly Jakob and Carmen Constantinescu and Bernhard Mitschang},
   title = {{Introducing SOA into Production Environments - The Manufacturing Service Bus}},
   booktitle = {Proceedings of the 43rd. CIRP International Conference on Manufacturing Systems},
   address = {Vienna, Graz, Austria},
   publisher = {neuer wissenschaftler Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1117--1124},
   type = {Conference Paper},
   month = {May},
   year = {2010},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   contact = {jorge.minguez@gsame.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Volatile markets and constantly changing business conditions force manufacturing enterprises to continuously adapt their digital factory information systems. In many industries there is still no backbone for the integration of factory information systems. Current integration is based on point-to-point interfaces, which is partially due to the cost of replacing their established legacy systems. Furthermore the lack of flexibility prevents business processes to improve their responsiveness and adapt workflows of manufacturing to different turbulences. The principles of Service-Oriented Architecture (SOA) and its associated technologies (e. g., Enterprise Service Bus) and standards are key enabler and driver of the required flexibility. The presented Manufacturing Service Bus is a SOA-based approach that extends the Enterprise Service Bus capabilities in three areas: event management, factory context semantics and change propagation workflows. The Manufacturing Service Bus provides an event-driven platform for flexible integration of digital factory applications.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-45&engl=1}
}
@inproceedings {INPROC-2010-43,
   author = {Stamatia Rizou and Kai H{\"a}ussermann and Frank D{\"u}rr and Nazario Cipriani and Kurt Rothermel},
   title = {{A system for distributed context reasoning.}},
   booktitle = {Proceedings of ICAS’10: International Conference on Autonomous and Autonomic Systems},
   publisher = {IEEE Computer Society Conference Publishing Services},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {84--89},
   type = {Conference Paper},
   month = {March},
   year = {2010},
   isbn = {978-0-7695-3970-6},
   doi = {10.1109/ICAS.2010.21},
   language = {English},
   cr-category = {C.2.4 Distributed Systems},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2010-43/INPROC-2010-43.pdf,     http://dx.doi.org/10.1109/ICAS.2010.21},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Context aware systems use context information to adapt their behaviour accordingly. In order to derive high level context information from low level context, such as sensor values, context reasoning methods that correlate observable context information, are necessary. Several context reasoning mechanisms have been proposed in the literature. Usually these mechanisms are centralized, leading to suboptimal utilization of network resources and poor system performance in case of large-scale scenarios. Therefore to increase the scalability of context reasoning systems the development of methods that distribute the reasoning process is necessary. Existing distributed approaches are method specific and do not provide a generic formalization for distributed reasoning. In this paper we introduce a novel system which enables distributed context reasoning in a generic way that is independent of the reasoning algorithm.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-43&engl=1}
}
@inproceedings {INPROC-2010-37,
   author = {Benjamin Leonhardi and Bernhard Mitschang and Rub{\'e}n Pulido and Christoph Sieb and Michael Wurst},
   title = {{Augmenting OLAP exploration with dynamic advanced analytics.}},
   booktitle = {Proceedings of the 13th International Conference on Extending Database Technology (EDBT 2010),Lausanne, Switzerland,March 22-26,2010},
   address = {New York, NY, USA},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {687--692},
   type = {Conference Paper},
   month = {April},
   year = {2010},
   isbn = {978-1-60558-945-9},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Online Analytical Processing (OLAP) is a popular technique for explorative data analysis. Usually, a fixed set of dimensions (such as time, place, etc.) is used to explore and analyze various subsets of a given, multi-dimensional data set. These subsets are selected by constraining one or several of the dimensions, for instance, showing sales only in a given year and geographical location. Still, such aggregates are often not enough. Important information can only be discovered by combining several dimensions in a multidimensional analysis. Most existing approaches allow to add new dimensions either statically or dynamically. These approaches support, however, only the creation of global dimensions that are not interactive for the user running the report. Furthermore, they are mostly restricted to data clustering and the resulting dimensions cannot be interactively refined. In this paper we propose a technique and an architectural solution that is based on an interaction concept for creating OLAP dimensions on subsets of the data dynamically, triggered interactively by the user, based on arbitrary multi-dimensional grouping mechanisms. This approach allows combining the advantages of both, OLAP exploration and interactive multidimensional analysis. We demonstrate the industry-strength of our solution architecture using a setup of IBM® InfoSphere™ Warehouse data mining and Cognos® BI as reporting engine. Use cases and industrial experiences are presented showing how insight derived from data mining can be transparently presented in the reporting front end, and how data mining algorithms can be invoked from the front end, achieving closed-loop integration.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-37&engl=1}
}
@inproceedings {INPROC-2010-20,
   author = {Christoph Stach},
   title = {{Gamework - A customizable framework for pervasive games}},
   booktitle = {IADIS International Conference Game and Entertainment Technologies (GET '10)},
   publisher = {IADIS Press},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {July},
   year = {2010},
   keywords = {Pervasive, mobile, customizable, games, framework, smartphones},
   language = {English},
   cr-category = {D.3.3 Programming Language Constructs and Features,     D.2.13 Software Engineering Reusable Software,     K.8 Personal Computing},
   contact = {Christoph Stach christoph.stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The number of pervasive games is growing in which players have to interact with their environment in order to control their avatar. While in the past they required immense hardware equipment, nowadays, smartphones have all required functionality built-in already. In addition, there is an upcoming trend towards software, supported with new content and knowledge by an active community. By combining these two trends, a new genre of computer games arises, targeting not only established gamers but also new audiences. We build four customization classes differing in required player's programming knowledge, support by the games and scale of adaption potential. With Gamework we present a framework for pervasive games on modern smartphones simplifying user-driven game customization for the identified customization methods in this paper. We also present two games implemented with this framework. Concluding, we show the potential of these games as well as the potential of our framework. We also report on early experiences in exploiting the customization approach of our framework.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-20&engl=1}
}
@inproceedings {INPROC-2010-19,
   author = {Carlos L{\"u}bbe and Andreas Brodt and Nazario Cipriani and Harald Sanftmann},
   title = {{NexusVIS: A Distributed Visualization Toolkit for Mobile Applications (Demonstration)}},
   booktitle = {Proceedings of the 8th Annual IEEE International Conference on Pervasive Computing and Communications (PerCom '10); Mannheim, Germany, March 2010},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--3},
   type = {Conference Paper},
   month = {March},
   year = {2010},
   isbn = {978-1-4244-5328-3},
   keywords = {Visualisierung, Datenstromverarbeitung},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   contact = {carlos.luebbe@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Visualisation and Interactive Systems, Visualisation and Interactive Systems},
   abstract = {Many mobile pervasive applications need to visualize information about the user's geographic surroundings combined with data from sensors, which determine the user's context. We demonstrate NexusVIS, a distributed visualization toolkit for mobile applications. By building upon an existing data stream processing system we enable applications to define distributed visualization processes as continuous queries. This allows applications to define visualization semantics descriptively. Moreover, NexusVIS is capable of adapting the visual query at runtime, and thus allows to navigate in the visualized scene both automatically and manually through user control.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-19&engl=1}
}
@inproceedings {INPROC-2010-122,
   author = {Nicola H{\"o}nle and Matthias Gro{\ss}mann and Steffen Reimann and Bernhard Mitschang},
   title = {{Usability analysis of compression algorithms for position data streams}},
   booktitle = {18th ACM SIGSPATIAL International Symposium on Advances in Geographic Information Systems, ACM-GIS 2010, November 3-5, 2010, San Jose, CA, USA, Proceedings},
   editor = {Agrawal Divyakant and Pusheng Zhang and Amr El Abbadi and Mohamed F. Mokbel},
   publisher = {ACM},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {240--249},
   type = {Conference Paper},
   month = {November},
   year = {2010},
   keywords = {trajectory compression; sensor data stream},
   language = {English},
   cr-category = {H.2.8 Database Applications,     C.2.4 Distributed Systems,     F.2.2 Nonnumerical Algorithms and Problems,     G.1.2 Numerical Analysis Approximation},
   contact = {nicola.hoenle@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {With the increasing use of sensor technology, the compression of sensor data streams is getting more and more important to reduce both the costs of further processing as well as the data volume for persistent storage. A popular method for sensor data compression is to smooth the original measurement curve by an approximated curve, which is bounded by a given maximum error value. Measurement values from positioning systems like GPS are an interesting special case, because they consist of two spatial and one temporal dimension. Therefore various standard techniques for approximation calculations like regression or line simplification algorithms cannot be directly applied. In this paper, we portray our stream data management system NexusDS and an operator for compressing sensor data. For the operator, we implemented various compression algorithms for position data streams. We present the required adaptations and the different characteristics of the compression algorithms as well as the results of our evaluation experiments, and compare them with a map matching approach, specifically developed for position data.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-122&engl=1}
}
@inproceedings {INPROC-2010-121,
   author = {Jorge Minguez and Frank Ruthardt and Philipp Riffelmacher and Thorsten Scheibler and Bernhard Mitschang},
   title = {{Service-based Integration in Event-driven Manufacturing Environments}},
   booktitle = {WISE 2010 Workshops},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Computer Science},
   volume = {6724},
   pages = {0--14},
   type = {Conference Paper},
   month = {December},
   year = {2010},
   keywords = {Manufacturing; Service-oriented Computing; Service-oriented Architecture},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Constantly changing business conditions require a high level of flexibility in business processes as well as an adaptive and fully interoperable IT infrastructure in today’s manufacturing environments. The lack of flexibility prevents manufacturing companies to improve their responsiveness and to adapt their workflows to turbulent scenarios. In order to achieve highly flexible and adaptive workflows, information systems in digital factories and shop floors need to be integrated. The most challenging problem in such manufacturing environments is the high heterogeneity of the IT landscape, where the integration of legacy systems and information silos has lead to chaotic architectures over the last two decades. In order to overcome this issue, we present a flexible integration platform that allows a loose coupling of distributed services in event-driven manufacturing environments. Our approach enables a flexible communication between digital factory and shop floor components by introducing a service bus architecture. Our solution integrates an application-independent canonical message format for manufacturing events, content-based routing and transformation services as well as event processing workflows.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-121&engl=1}
}
@inproceedings {INPROC-2010-120,
   author = {Andreas Brodt and Alexander Wobser and Bernhard Mitschang},
   title = {{Resource Discovery Protocols for Bluetooth-Based Ad-hoc Smart Spaces: Architectural Considerations and Protocol Evaluation}},
   booktitle = {Proceedings of the 2010 Eleventh International Conference on Mobile Data Management},
   address = {Washington, DC, USA},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {145--150},
   type = {Conference Paper},
   month = {May},
   year = {2010},
   isbn = {978-0-7695-4048-1},
   keywords = {Bluetooth; ad-hoc network; scatternet; protocol; evaluation; ad-hoc smart spaces; resource discovery; mobile device},
   language = {English},
   cr-category = {C.2.1 Network Architecture and Design,     C.2.2 Network Protocols},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2010-120/INPROC-2010-120.pdf},
   contact = {brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Ad-hoc smart spaces aim at resource-rich mobile devices sharing resource and context data with others near them spontaneously. Thus, a device may, e.g., obtain a more complete context model by utilizing sensor data of its neighbors via wireless communication, such as Bluetooth. The highly dynamic device neighborhood challenges resource discovery, as the devices have to organize themselves autonomously. This paper evaluates different resource discovery protocols in Bluetooth-based ad-hoc smart spaces. We simulate the protocols in different scenarios taking into account the scatternet structure of the network. We suggest request flooding for small settings and random replication for medium to large spaces.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-120&engl=1}
}
@inproceedings {INPROC-2010-119,
   author = {Andreas Brodt and Daniela Nicklas and Bernhard Mitschang},
   title = {{Deep integration of spatial query processing into native RDF triple stores}},
   booktitle = {Proceedings of the 18th SIGSPATIAL International Conference on Advances in Geographic Information Systems},
   address = {New York, NY, USA},
   publisher = {ACM Press},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {33--42},
   type = {Conference Paper},
   month = {November},
   year = {2010},
   isbn = {978-1-4503-0428-3},
   keywords = {GIS, RDF, SPARQL, spatial database, triple store},
   language = {English},
   cr-category = {H.2.8 Database Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2010-119/INPROC-2010-119.pdf},
   contact = {brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Semantic Web technologies, most notably RDF, are well-suited to cope with typical challenges in spatial data management including analyzing complex relations between entities, integrating heterogeneous data sources and exploiting poorly structured data, e.g., from web communities. Also, RDF can easily represent spatial relationships, as long as the location information is symbolic, i.e., represented by places that have a name. What is widely missing is support for geographic and geometric information, such as coordinates or spatial polygons, which is needed in many applications that deal with sensor data or map data. This calls for efficient data management systems which are capable of querying large amounts of RDF data and support spatial query predicates. We present a native RDF triple store implementation with deeply integrated spatial query functionality. We model spatial features in RDF as literals of a complex geometry type and express spatial predicates as SPARQL filter functions on this type. This makes it possible to use W3C's standardized SPARQL query language as-is, i.e., without any modifications or extensions for spatial queries. We evaluate the characteristics of our system on very large data volumes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-119&engl=1}
}
@inproceedings {INPROC-2010-08,
   author = {Nazario Cipriani and Carlos L{\"u}bbe and Alexander Moosbrugger},
   title = {{Exploiting Constraints to Build a Flexible and Extensible Data Stream Processing Middleware}},
   booktitle = {The Third International Workshop on Scalable Stream Processing Systems},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--8},
   type = {Workshop Paper},
   month = {April},
   year = {2010},
   keywords = {Data Stream Processing; Stream Databases; Middleware Platforms for Data Management; P2P and Networked Data Management; Database Services and Applications},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {A wide range of real-time applications process stream-based data. To process this stream-based data in an application-independent manner, many stream processing systems have been built. However, none of them reached a huge domain of applications, such as databases did. This is due to the fact that they do not consider the specific needs of real-time applications. For instance, an application which visualizes stream-based data has stringent timing constraints, or may even need a specific hardware environment to smoothly process the data. Furthermore, users may even add additional constraints. E.g., for security reasons they may want to restrict the set of nodes that participates in processing. Thus, constraints naturally arise on different levels of query processing. In this work we classify constraints that occur on different levels of query processing. Furthermore we propose a scheme to classify the constraints and show how these can be integrated into the query processing of the distributed data stream middleware NexusDS.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-08&engl=1}
}
@inproceedings {INPROC-2010-05,
   author = {Sylvia Radesch{\"u}tz and Florian Niedermann and Wolfgang Bischoff},
   title = {{BIAEditor - Matching Process and Operational Data for a Business Impact Analysis}},
   booktitle = {Proc. of the 13th International Conference on Extending Database Technology (EDBT 2010), Switzerland, March 22-26, 2010},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {March},
   year = {2010},
   language = {English},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques,     D.2.12 Software Engineering Interoperability,     H.4.1 Office Automation,     H.5.2 Information Interfaces and Presentation User Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {A profound analysis of all relevant business data in the company is necessary for optimizing business processes effectively. Current analyses typically exclusively run on business process execution data or on operational business data stored in a data warehouse. However, to achieve a more informative analysis and to fully optimize a company’s business, a consolidation of all major business data sources is indispensable. Recent matching algorithms are insufficient for this task, since they are restricted either to schema or to process matching. Our demonstration presents BIAEditor that allows to annotate and match process variables and operational data models in order to perform such a global business impact analysis.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-05&engl=1}
}
@inproceedings {INPROC-2009-94,
   author = {Nazario Cipriani and Mike Eissele and Andreas Brodt and Matthias Gro{\ss}mann and Bernhard Mitschang},
   title = {{NexusDS: A Flexible and Extensible Middleware for Distributed Stream Processing}},
   booktitle = {IDEAS '09: Proceedings of the 2008 International Symposium on Database Engineering \& Applications},
   editor = {ACM},
   publisher = {ACM},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {152--161},
   type = {Conference Paper},
   month = {September},
   year = {2009},
   keywords = {Data Stream Processing; Stream Databases; Middleware Platforms for DataManagement; P2P and Networked DataManagement; Database Services and Applications},
   language = {English},
   cr-category = {C.2 Computer-Communication Networks,     C.5 Computer System Implementation,     H.2 Database Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {ABSTRACT Techniques for efficient and distributed processing of huge, unbound data streams have made some impact in the database community. Sensors and data sources, such as position data of moving objects, continuously produce data that is consumed, e.g., by location-aware applications. Depending on the domain of interest, e.g. visualization, the processing of such data often depends on domain-specific functionality. This functionality is specified in terms of dedicated operators that may require specialized hardware, e.g. GPUs. This creates a strong dependency which a data stream processing system must consider when deploying such operators. Many data stream processing systems have been presented so far. However, these systems assume homogeneous computing nodes, do not consider operator deployment constraints, and are not designed to address domain-specific needs. In this paper, we identify necessary features that a exible and extensible middleware for distributed stream processing of context data must satisfy. We present NexusDS, our approach to achieve these requirements. In NexusDS, data processing is specified by orchestrating data flow graphs, which are modeled as processing pipelines of predefined and general operators as well as custom-built and domain-specific ones. We focus on easy extensibility and support for domain-specific operators and services that may even utilize specific hardware available on dedicated computing nodes},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-94&engl=1}
}
@inproceedings {INPROC-2009-86,
   author = {Matthias Grossmann and Nicola H{\"o}nle and Carlos L{\"u}bbe and Harald Weinschrott},
   title = {{An Abstract Processing Model for the Quality of Context Data}},
   booktitle = {Proceedings of the 1st International Workshop on Quality of Context},
   publisher = {Springer},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {132--143},
   type = {Workshop Paper},
   month = {June},
   year = {2009},
   keywords = {uncertainty; inconsistency; trust; processing model},
   language = {English},
   cr-category = {H.2.8 Database Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2009-86/INPROC-2009-86.pdf,     http://dx.doi.org/10.1007/978-3-642-04559-2_12},
   contact = {Matthias.Grossmann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Data quality can be relevant to many applications. Especially applications coping with sensor data cannot take a single sensor value for granted. Because of technical and physical restrictions each sensor reading is associated with an uncertainty. To improve quality, an application can combine data values from different sensors or, more generally, data providers. But as different data providers may have diverse opinions about a certain real world phenomenon, another issue arises: inconsistency. When handling data from different data providers, the application needs to consider their trustworthiness. This naturally introduces a third aspect of quality: trust. In this paper we propose a novel processing model integrating the three aspects of quality: uncertainty, inconsistency and trust.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-86&engl=1}
}
@inproceedings {INPROC-2009-68,
   author = {Sylvia Radesch{\"u}tz and Bernhard Mitschang},
   title = {{Extended Analysis Techniques For a Comprehensive Business Process Optimization}},
   booktitle = {Proc. of the International Conference on Knowledge Management and Information Sharing (KMIS 2009), Portugal, 6.-8. Oktober, 2009.},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {October},
   year = {2009},
   language = {English},
   cr-category = {H.2.7 Database Administration,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Efficient adaption of a company’s business and its business processes to a changing environment is a crucial ability to survive in today’s dynamic world. For optimizing business processes, a profound analysis of all relevant business data in the company is necessary. We define an extended data warehouse approach that integrates process-related data and operational business data. This extended data warehouse is used as the underlying data source for extended OLAP and data mining analysis techniques for a comprehensive business process optimization.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-68&engl=1}
}
@inproceedings {INPROC-2009-60,
   author = {Andreas Brodt and Christoph Stach},
   title = {{Mobile ortsbasierte Browserspiele}},
   booktitle = {Tagungsband der 39. GI-Jahrestagung, 28.9. - 2.10.2009, Universit{\"a}t zu L{\"u}beck},
   editor = {Gesellschaft f{\"u}r Informatik e.V.},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Informatics},
   type = {Workshop Paper},
   month = {September},
   year = {2009},
   keywords = {Pervasive Games; GPS; location-based games; browser games},
   language = {German},
   cr-category = {H.5.1 Multimedia Information Systems,     H.5.2 Information Interfaces and Presentation User Interfaces,     K.8 Personal Computing},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2009-60/INPROC-2009-60.pdf},
   contact = {Andreas Brodt andreas.brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die Verbreitung von mobilen Ger{\"a}ten und Positionssensoren wie GPS erm{\"o}glicht mobile ortsbasierte Spiele, in denen sich die Spieler physisch in ihrer Umwelt bewegen m{\"u}ssen, um Einfluss auf das Spielgeschehen zu nehmen. Klassische Computerspiele werden zunehmend als Browserspiel realisiert, d.h. der Web-Browser des Spielers wird f{\"u}r die Benutzerschnittstelle verwendet. Indem der Web-Browser um eine Kontextschnittstelle erweitert wird, kann einem Browserspiel Zugriff auf die aktuelle Position des Spielers gew{\"a}hrt werden. Dadurch wird es m{\"o}glich, mobile ortsbasierte Spiele im Web-Browser zu spielen. In diesem Papier besch{\"a}ftigen wir uns mit dem Eigenschaften mobiler ortsbasierter Browserspiele. Wir stellen zwei Beispiele vor, anhand derer wir untersuchen, welche Einfl{\"u}sse mobile ortsbasierte Spiele auf das Spielkonzept haben und welche technischen Konsequenzen sich daraus ergeben. Abschlie{\ss}end pr{\"a}sentieren wir ein Framework zur Entwicklung mobiler ortsbasierter Spiele.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-60&engl=1}
}
@inproceedings {INPROC-2009-53,
   author = {Nazario Cipriani and Matthias Wieland and Matthias Grossmann and Daniela Nicklas},
   title = {{Tool Support for the Design and Management of Spatial Context Models}},
   booktitle = {Proc. of the 13th East European Conference on Advances in Databases and Information Systems (ADBIS 2009)},
   address = {Riga, Lativa},
   publisher = {Springer},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {September},
   year = {2009},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {A central task in the development of context-aware applications is the modeling and management of complex context information. In this paper, we present the NexusEditor, which eases this task by providing a graphical user interface to design schemas for spatial context models, interactively create queries, send them to a server and visualize the results. One main contribution is to show how schema awareness can improve such a tool: the NexusEditor dynamically parses the underlying data model and provides additional syntactic checks, semantic checks, and short-cuts based on the schema information. Furthermore, the tool helps to design new schema definitions based on the existing ones, which is crucial for an iterative and user-centric development of context-aware applications. Finally, it provides interfaces to existing information spaces and visualization tools for spatial data like GoogleEarth.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-53&engl=1}
}
@inproceedings {INPROC-2009-47,
   author = {Andreas Brodt and Sailesh Sathish},
   title = {{Together we are strong -- Towards ad-hoc smart spaces}},
   booktitle = {Proceedings of the 7th Annual IEEE International Conference on Pervasive Computing and Communications (PerCom '09). Galveston, TX, USA. March 2009},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {January},
   year = {2009},
   keywords = {ad-hoc; smart space; mobile},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.4 Information Storage and Retrieval Systems and Software,     H.3.5 Online Information Services},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2009-47/INPROC-2009-47.pdf,     http://www.nexus.uni-stuttgart.de/},
   contact = {andreas.brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today's mobile devices feature many resources, sensors and data, which make it possible for them to adapt to their environment. However, they would have a lot more resources at hand, and thus could better adapt to their context, if they used their communication capabilities to share their resources with others near them. In this paper we propose the concept of ad-hoc smart spaces, which enables mobile devices to utilize resources owned by other devices in physical proximity. This imposes a number of challenges as cooperation partners can join and leave any time and as devices are highly heterogeneous. We propose a system architecture for ad-hoc smart spaces and present a prototypic implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-47&engl=1}
}
@inproceedings {INPROC-2009-46,
   author = {Eva Fenrich and Andreas Brodt and Daniela Nicklas},
   title = {{WODCA: A MOBILE, WEB-BASED FIELD SAMPLING SUPPORT SYSTEM}},
   booktitle = {Proceedings of the 8th international conference on Hydroinformatics, HEIC 2009},
   publisher = {International Water Association},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {January},
   year = {2009},
   keywords = {GPS, DCCI, Field sampling,},
   language = {English},
   cr-category = {H.3.5 Online Information Services},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Efficient data acquisition methods can save time and money in field measurements. As most field data in aquatic systems is time dependent, it is important to minimize sampling errors as measurements for a certain time and place cannot be re-taken. For larger measurement campaigns with different teams at distributed sampling sites, information about data from other teams as well as environmental data like gauge, tidal or upstream weather information could help to interpret measurement results already on site. We propose WODCA (Water Observation Data Collecting Application), a mobile, online measurement support system. The measurements are sent wirelessly to a geographic database that provides back an integrated view on already taken measurements of all mobile parties, augmented with online environmental data like gauge data or tidal information. This eases the collaboration between different mobile measurement teams. GPS integration and map based data input can help to avoid location errors. The proposed system could assist materially in the improvement of field data quality and sampling comfort.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-46&engl=1}
}
@inproceedings {INPROC-2009-45,
   author = {Andreas Brodt and Nazario Cipriani},
   title = {{NexusWeb - eine kontextbasierte Webanwendung im World Wide Space}},
   booktitle = {Datenbanksysteme in Business, Technologie und Web (BTW 2009), 13. Fachtagung des GI-Fachbereichs ``Datenbanken und Informationssysteme'' (DBIS), Proceedings, 2.-6. M{\"a}rz 2009, M{\"u}nster, Germany},
   editor = {GI},
   publisher = {GI},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Informatics},
   volume = {144},
   pages = {588--591},
   type = {Conference Paper},
   month = {March},
   year = {2009},
   isbn = {978-3-88579-238-3},
   keywords = {DCCI, location-based services, Nokia N810, Internet Tablet, GPS, Google Maps, Nexus, AWQL, AWML},
   language = {German},
   cr-category = {H.3.5 Online Information Services},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2009-45/INPROC-2009-45.pdf},
   contact = {Andreas Brodt andreas.brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Wir pr{\"a}sentieren NexusWeb, eine kontextbasierte Webanwendung, die ein Umgebungsmodell des Benutzers zeichnet. NexusWeb bezieht dazu Kontextdaten des World Wide Space, einer F{\"o}deration verschiedenster Datenanbieter. Die GPS-Position des Benutzers gelangt {\"u}ber eine standardisierte Browsererweiterung in die Webanwendung und steuert die Ansicht von NexusWeb. Wir zeigen verschiedene Szenarien sowohl auf einem mobilen Ger{\"a}t als auch auf einem gew{\"o}hnlichen Laptop.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-45&engl=1}
}
@inproceedings {INPROC-2009-29,
   author = {Fabian Kaiser and Holger Schwarz and Mih{\'a}ly Jakob},
   title = {{Using Wikipedia-based conceptual contexts to calculate document similarity}},
   booktitle = {ICDS2009: Proceedings of the 3rd International Conference on Digital Society},
   address = {Cancun, Mexico},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {322--327},
   type = {Conference Paper},
   month = {February},
   year = {2009},
   language = {English},
   cr-category = {H.3 Information Storage and Retrieval,     H.3.3 Information Search and Retrieval},
   ee = {http://dx.doi.org/10.1109/ICDS.2009.7},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Rating the similarity of two or more text documents is an essential task in information retrieval. For example, document similarity can be used to rank search engine results, cluster documents according to topics etc. A major challenge in calculating document similarity originates from the fact that two documents can have the same topic or even mean the same, while they use different wording to describe the content. A sophisticated algorithm therefore will not directly operate on the texts but will have to find a more abstract representation that captures the texts' meaning. In this paper, we propose a novel approach for calculating the similarity of text documents. It builds on conceptual contexts that are derived from content and structure of the Wikipedia hypertext corpus.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-29&engl=1}
}
@inproceedings {INPROC-2009-130,
   author = {Jorge Minguez and Mihaly Jakob and Uwe Heinkel and Bernhard Mitschang},
   title = {{A SOA-based approach for the integration of a data propagation system}},
   booktitle = {IRI'09: Proceedings of the 10th IEEE international conference on Information Reuse \& Integration},
   publisher = {IEEE Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {47--52},
   type = {Conference Paper},
   month = {August},
   year = {2009},
   isbn = {978-1-4244-4114-3},
   language = {German},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Major challenges that companies face nowadays are extremely volatile markets, a globally distributed supplier network and constantly changing business environments. These circumstances demand a high level of agility and extraordinary flexibility in the business modeling and the organizational structures of a company as well as adaptive and interoperable IT systems. In order to meet these requirements an integration of systems needs to be achieved. A possible solution for this problem is Champagne, which is a data propagation system that ensures the interoperability of enterprise applications at the data level. However, Champagne provides a tightly-coupled integration of applications and its architecture lacks the needed flexibility to link business processes. These deficiencies can be overcome with the adoption of a service-oriented architecture (SOA), based on loosely-coupled services, which enable a higher level of flexibility and interoperability. Therefore, we explore in this paper a number of options to reuse and integrate Champagne into a service-oriented architecture in order to benefit from SOA principles.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-130&engl=1}
}
@inproceedings {INPROC-2009-126,
   author = {Jorge M$\backslash$'$\backslash$inguez and Mih$\backslash$'aly Jakob and Uwe Heinkel and Bernhard Mitschang},
   title = {{A SOA-based approach for the integration of a data propagation system}},
   booktitle = {IRI'09: Proceedings of the 10th IEEE international conference on Information Reuse \& Integration},
   publisher = {IEEE Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {47--52},
   type = {Conference Paper},
   month = {August},
   year = {2009},
   isbn = {978-1-4244-4114-3},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Major challenges that companies face nowadays are extremely volatile markets, a globally distributed supplier network and constantly changing business environments. These circumstances demand a high level of agility and extraordinary flexibility in the business modeling and the organizational structures of a company as well as adaptive and interoperable IT systems. In order to meet these requirements an integration of systems needs to be achieved. A possible solution for this problem is Champagne, which is a data propagation system that ensures the interoperability of enterprise applications at the data level. However, Champagne provides a tightly-coupled integration of applications and its architecture lacks the needed flexibility to link business processes. These deficiencies can be overcome with the adoption of a service-oriented architecture (SOA), based on loosely-coupled services, which enable a higher level of flexibility and interoperability. Therefore, we explore in this paper a number of options to reuse and integrate Champagne into a service-oriented architecture in order to benefit from SOA principles.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-126&engl=1}
}
@inproceedings {INPROC-2009-125,
   author = {Jorge M$\backslash$'$\backslash$inguez and Mih$\backslash$'aly Jakob and Uwe Heinkel and Bernhard Mitschang},
   title = {{A SOA-based approach for the integration of a data propagation system}},
   booktitle = {IRI'09: Proceedings of the 10th IEEE international conference on Information Reuse \& Integration},
   publisher = {IEEE Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {47--52},
   type = {Conference Paper},
   month = {August},
   year = {2009},
   isbn = {978-1-4244-4114-3},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Major challenges that companies face nowadays are extremely volatile markets, a globally distributed supplier network and constantly changing business environments. These circumstances demand a high level of agility and extraordinary flexibility in the business modeling and the organizational structures of a company as well as adaptive and interoperable IT systems. In order to meet these requirements an integration of systems needs to be achieved. A possible solution for this problem is Champagne, which is a data propagation system that ensures the interoperability of enterprise applications at the data level. However, Champagne provides a tightly-coupled integration of applications and its architecture lacks the needed flexibility to link business processes. These deficiencies can be overcome with the adoption of a service-oriented architecture (SOA), based on loosely-coupled services, which enable a higher level of flexibility and interoperability. Therefore, we explore in this paper a number of options to reuse and integrate Champagne into a service-oriented architecture in order to benefit from SOA principles.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-125&engl=1}
}
@inproceedings {INPROC-2009-120,
   author = {Nicola H{\"o}nle and Matthias Gro{\ss}mann and Dominik Lucke and Engelbert Westk{\"a}mper},
   title = {{Historisierung und Analyse von Stromdaten in einem Data Warehouse am Beispiel der Smart Factory}},
   booktitle = {Beitr{\"a}ge der 39. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI)},
   editor = {Stefan Fischer and Erik Maehle and R{\"u}diger Reischuk},
   address = {Bonn},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Informatics},
   volume = {P-154},
   pages = {246--246},
   type = {Workshop Paper},
   month = {September},
   year = {2009},
   isbn = {978-3-88579-248-2},
   language = {German},
   cr-category = {H.2.8 Database Applications,     J.7 Computers in Other Systems},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Industrielle Fertigung und Fabrikbetrieb (IFF);     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die heute geforderte schnelle Anpassung von Fabriken an sich st{\"a}ndig {\"a}ndernde Herausforderungen des Marktes erfordert aktuelle und korrekte Informationen {\"u}ber den Zustand der Fabrik. Dabei fallen Stromdaten unterschiedlicher Herkunft an (z.B. Betriebsdaten aus Maschinen oder Sensormesswerte, verkn{\"u}pft mit virtuellen Informationen wie z.B. Workflows), zu deren Erfassung und Integration ein System zum Stromdatenmanagement ben{\"o}tigt wird. Dazu setzen wir ein spezielles Datenstromverarbeitungssystem ein. Im Teilprojekt „Smart Factory“ des Sonderforschungsbereichs 627 Nexus werden Anwendungen f{\"u}r die Produktion erforscht, die eine kontextbezogene Unterst{\"u}t-zung von Mitarbeitern und Maschinen erm{\"o}glichen. Die anfallenden Daten in der Smart Factory sowohl von Sensoren als auch von Leitrechnern und Maschinen k{\"o}nnen nicht nur zur Unterst{\"u}tzung aktueller Aufgaben verwendet werden, sondern aus der Analyse der Datenhistorien lassen sich auch wertvolle Erkenntnisse gewinnen, die wiederum r{\"u}ckwirkend den Alltagsbetrieb in der Fabrik verbessern k{\"o}nnen. In diesem Artikel stellen wir den Entwurf eines Data Warehouses vor, das zur Speicherung und Analyse von Datenhistorien aus der Smart Factory entworfen wurde, und wir skizzieren, wie mit Hilfe des verwendeten Datenstromverarbeitungssystems das kontinuierliche Laden der Daten realisiert werden kann.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-120&engl=1}
}
@inproceedings {INPROC-2009-119,
   author = {Nazario Cipriani and Carlos L{\"u}bbe},
   title = {{Ausnutzung von Restriktionen zur Verbesserung des Deployment-Vorgangs des Verteilten Datenstromverarbeitungssystems NexusDS}},
   booktitle = {Beitr{\"a}ge der 39. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI)},
   editor = {Stefan Fischer and Erik Maehle and R{\"u}diger Reischug},
   address = {Bonn},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Informatics},
   volume = {P-154},
   pages = {240--240},
   type = {Workshop Paper},
   month = {September},
   year = {2009},
   isbn = {978-3-88579-248-2},
   keywords = {Data Stream Processing; Stream Databases; Middleware Platforms for Data Management; P2P and Networked Data Management; Database Services and Applications},
   language = {German},
   cr-category = {C.2 Computer-Communication Networks,     H.2 Database Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Kontextsensitive Informationssysteme verarbeiten h{\"a}ufig Daten der n{\"a}heren Umgebung, die mit Hilfe von Sensoren kontinuierlich erhoben werden. F{\"u}r die Verarbeitung kontinuierlicher Datenstr{\"o}me k{\"o}nnen Datenstromverarbeitungssysteme eingesetzt werden. Jedoch m{\"u}ssen diese im Bereich der Kontextdatenverarbeitung mit einem heterogenen Umfeld zurechtkommen. Je nach technischer Ausstattung der physischen Umgebung sollten sie sich an die dort geltenden Bedingungen bzw. Restriktionen anpassen. F{\"u}r verteilte Datenstromverarbeitungssysteme ist die Anfrageverteilung in einem solchen Umfeld eine besondere Herausforderung, denn das System muss Restriktionen auf verschiedenen Ebenen ber{\"u}cksichtigen. So k{\"o}nnte ein Teil der Anfrage gewisse Anforderungen an seine Ausf{\"u}hrungsumgebung haben, wie spezialisierte Hardware, oder es k{\"o}nnte aus Sicherheitsgr{\"u}nden notwendig sein, die Anfrage oder einen Anfrageteil in einer sicheren Ausf{\"u}hrungsumgebung auszuf{\"u}hren. In diesem Papier klassifizieren wir Restriktionen, die auf verschiedenen Ebenen der Anfrageverarbeitung des Systems vorkommen k{\"o}nnen. {\"U}berdies stellen wir ein Konzept zur Modellierung der Restriktionsklassen vor und zeigen wie diese in der Anfrageverarbeitung des verteilten Datenstromverarbeitungssystems NexusDS ber{\"u}cksichtigt werden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-119&engl=1}
}
@inproceedings {INPROC-2009-07,
   author = {Ralph Lange and Nazario Cipriani and Lars Geiger and Matthias Gro{\ss}mann and Harald Weinschrott and Andreas Brodt and Matthias Wieland and Stamatia Rizou and Kurt Rothermel},
   title = {{Making the World Wide Space Happen: New Challenges for the Nexus Context Platform}},
   booktitle = {Proceedings of the 7th Annual IEEE International Conference on Pervasive Computing and Communications (PerCom '09). Galveston, TX, USA. March 2009},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {March},
   year = {2009},
   keywords = {Nexus; context; mobile context-aware applications; context-awareness; context management; World Wide Space; stream-processing; situation recognition; reasoning; workflows; quality of context},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.4 Information Storage and Retrieval Systems and Software,     H.3.5 Online Information Services},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2009-07/INPROC-2009-07.pdf,     http://www.nexus.uni-stuttgart.de/,     http://dx.doi.org/10.1109/PERCOM.2009.4912782},
   contact = {ralph.lange@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Context-aware applications rely on models of the physical world. Within the Nexus project, we envision a World Wide Space which provides the conceptual and technological framework for integrating and sharing such context models in an open, global platform of context providers. In our ongoing research we tackle important challenges in such a platform including distributed processing of streamed context data, situation recognition by distributed reasoning, efficient management of context data histories, and quality of context information. In this paper we discuss our approach to cope with these challenges and present an extended Nexus architecture.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-07&engl=1}
}
@inproceedings {INPROC-2008-91,
   author = {Lu Jing and Mitschang Bernhard},
   title = {{An XQuery-based Trigger Service to Bring Consistency Management to Data Integration Systems}},
   booktitle = {10th International Conference on Information Integration and Web-based Applications \& Services (iiWAS2008). Linz, Austria, November 24 - 26, 2008.},
   address = {Linz, Austria},
   publisher = {ACM Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {November},
   year = {2008},
   isbn = {978-1-60558-349-5},
   language = {English},
   cr-category = {H.2.7 Database Administration},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays XML-based data integration systems are accepted as data service providers on the web. In order to make such a data integration system fully equipped with data manipulation capabilities, programming frameworks which support update at the integration level are being developed. When the user is permitted to submit updates, it is necessary to establish the best possible data consistency in the whole data integration system. To that extend, we present an approach based on an XQuery trigger service. We define an XQuery trigger model together with its semantics. We report on the integration of the XQuery trigger service into the overall architecture and discuss details of the execution model. Experiments show that data consistency is enforced easily, efficiently and conveniently at the global level.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-91&engl=1}
}
@inproceedings {INPROC-2008-86,
   author = {Sylvia Radesch{\"u}tz and Bernhard Mitschang},
   title = {{An Annotation Approach for the Matching of Process Variables and Operational Business Data Models}},
   booktitle = {Proc. of the 21st International Conference on Computer Applications in Industry and Engineering (CAINE 2008)},
   address = {Honolulu, USA},
   publisher = {The International Society for Computers and Their Applications},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {November},
   year = {2008},
   language = {English},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques,     D.2.12 Software Engineering Interoperability,     H.4.1 Office Automation,     H.5.2 Information Interfaces and Presentation User Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Efficient adaptation to new situations of a company’s business and its business processes plays an important role for achieving advantages in competition to other companies. For an optimization of business processes, a profound analysis of all relevant business data in the company is necessary. Analyses typically specialize either on process analysis or on data warehousing of operational business data. However, to achieve a significantly more detailed analysis in order to fully optimize a company’s business, a consolidation of all major business data sources is indispensable. This paper introduces an approach that allows consolidating process variables and operational data models in a semi-automatic manner. In order to do this, a semantic annotation is applied. In this paper, we focus on an ontology-based annotation of the operational data in data warehouses, show how it is realized in a tool and discuss its general usability in other areas.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-86&engl=1}
}
@inproceedings {INPROC-2008-82,
   author = {Frank Wagner and Kathleen Krebs and Cataldo Mega and Bernhard Mitschang and Norbert Ritter},
   title = {{Email Archiving and Discovery as a Service}},
   booktitle = {Intelligent Distributed Computing, Systems and Applications; Proceedings of the 2nd International Symposium on Intelligent Distributed Computing: IDC 2008; Catania, Italy},
   editor = {Costin Badica and Giuseppe Mangioni and Vincenza Carchiolo and Dumitru Dan Burdescu},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Studies in Computational Intelligence},
   volume = {162},
   pages = {197--206},
   type = {Conference Paper},
   month = {September},
   year = {2008},
   isbn = {978-3-540-85256-8},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.3.2 Information Storage,     H.3.4 Information Storage and Retrieval Systems and Software},
   contact = {Frank Wagner frank.wagner@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Corporate governance and legislative regulations are forcing companies to extend their IT infrastructure by Email Archive and Discovery (EAD) systems for compliance reasons. Praxis shows that every installation is di??erent from another; not only in terms of the execution infrastructure, but also in terms of e.g. document and archiving procedures that map a company’s own business rules. As a consequence, EAD systems have to be highly customizable to their intended usages. For this purpose, we propose a service-oriented approach at various levels of detail that, on one hand, allows for describing EAD properties at the abstract (service) level and, on the other hand, supports the appropriate mapping of these services to the existing execution infrastructure. In this paper, we focus on the development and (architectural) design of an EAD system, which is well suited to fulfill these requirements. On the long run, we consider this solution as an important step on the way to an e??ective distributed and scalable approach, which, as we think, can be achieved by appropriate mechanisms of automatic workload management and dynamic provisioning of EAD services based on e.g. grid technology.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-82&engl=1}
}
@inproceedings {INPROC-2008-81,
   author = {Frank Wagner and Kathleen Krebs and Cataldo Mega and Bernhard Mitschang and Norbert Ritter},
   title = {{Towards the Design of a Scalable Email Archiving and Discovery Solution}},
   booktitle = {Proceedings of the 12th East-European Conference on Advances in Databases and Information Systems},
   editor = {Paolo Atzeni and Albertas Caplinskas and Hannu Jaakkola},
   publisher = {Sptringer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Lecture Notes in Computer Science},
   pages = {305--320},
   type = {Conference Paper},
   month = {September},
   year = {2008},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.3.2 Information Storage,     H.3.4 Information Storage and Retrieval Systems and Software},
   contact = {Frank Wagner frank.wagner@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper we propose a novel approach to specialize a general purpose Enterprise Content Management (ECM) System into an Email Archiving and Discovery (EAD) System. The magnitude and range of compliance risks associated with the management of EAD is driving investment in the development of more effective and efficient approaches to support regulatory compliance, legal discovery and content life-cycle needs. Companies must recognize and address requirements like legal compliance, electronic discovery, and document retention management. What is needed today are EAD systems capable to process very high message ingest rates, support distributed full text indexing, and allow forensic search such to support litigation cases. All this must be provided at lowest cost with respect to archive management and administration. In our approach we introduce a virtualized ECM repository interface where the key content repository components are wrapped into a set of tightly coupled Grid service entities, such to achieve scale-out on a cluster of commodity blade hardware that is automatically configured and dynamically provisioned. By doing so we believe, we can leverage the strength of Relational Database Management Systems and Full Text Indexes in a managed clustered environment with minimal operational overhead.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-81&engl=1}
}
@inproceedings {INPROC-2008-51,
   author = {Nicola H{\"o}nle and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
   title = {{Preprocessing Position Data of Mobile Objects}},
   booktitle = {Proceedings of the 9th International Conference on Mobile Data Management (MDM'08); Beijing, China, April 27-30, 2008.},
   publisher = {IEEE computer society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {April},
   year = {2008},
   isbn = {978-0-7695-3154-0},
   language = {German},
   cr-category = {H.2.8 Database Applications,     G.1.2 Numerical Analysis Approximation},
   contact = {nicola.hoenle@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {We present the design and implementation of a component for the preprocessing of position data taken from moving objects. The movement of mobile objects is represented by piecewise functions over time that approximate the real object movement and significantly reduce the initial data volume such that efficient storage and analysis of object trajectories can be achieved. The maximal acceptable deviation---an input parameter of our algorithms---of the approximations also includes the uncertainty of the position sensor measurements. We analyze and compare five different lossy preprocessing methods. Our results clearly indicate that even with simple approaches, a more than sufficient overall performance can be achieved.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-51&engl=1}
}
@inproceedings {INPROC-2008-50,
   author = {Andreas Brodt and Daniela Nicklas and Sailesh Sathish and Bernhard Mitschang},
   title = {{Context-Aware Mashups for Mobile Devices}},
   booktitle = {Web Information Systems Engineering – WISE 2008 9th International Conference on Web Information Systems Engineering, Auckland, New Zealand, September 1-3, 2008, Proceedings},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Computer Science},
   type = {Conference Paper},
   month = {January},
   year = {2008},
   keywords = {mashup, location-based services, Delivery Context Client Interfaces, DCCI, AJAX, context provisioning},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.12 Software Engineering Interoperability,     H.5.1 Multimedia Information Systems,     H.5.4 Hypertext/Hypermedia,     H.2.5 Heterogeneous Databases},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2008-50/INPROC-2008-50.pdf},
   contact = {andreas.brodt@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {With the Web 2.0 trend and its participation of end-users more and more data and information services are online accessible, such as web sites, Wikis, or web services. So-called mashups---web applications that integrate data from more than one source into an integrated service---can be easily realized using scripting languages. Also, mobile devices are increasingly powerful, have ubiquitous access to the Web and feature local sensors, such as GPS. Thus, mobile applications can adapt to the mobile user's current situation. We examine how context-aware mashups can be created. One challenge is the provisioning of context data to the mobile application. For this, we discuss different ways to integrate context data, such as the user's position, into web applications. Moreover, we assess different data formats and the overall performance. Finally, we present the Telar Mashup Platform, a client-server solution for location-based mashups for mobile devices such as the Nokia N810 Internet Tablet.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-50&engl=1}
}
@inproceedings {INPROC-2008-49,
   author = {Matthias Grossmann and Nicola H{\"o}nle and Daniela Nicklas and Bernhard Mitschang},
   title = {{Reference Management in a Loosely Coupled, Distributed Information System}},
   booktitle = {Proceedings of the 12th East-European Conference on Advances in Databases and Information Systems},
   editor = {Paolo Atzeni and Albertas Caplinskas and Hannu Jaakkola},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Computer Science},
   type = {Conference Paper},
   month = {September},
   year = {2008},
   language = {English},
   cr-category = {E.2 Data Storage Representations,     H.2.2 Database Management Physical Design,     H.2.4 Database Management Systems},
   contact = {Matthias Grossmann matthias.grossmann@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {References between objects in loosely coupled distributed information systems pose a problem. On the one hand, one tries to avoid referential inconsistencies like, e.g., dangling links in the WWW. On the other hand, using strict constraints as in databases may restrict the data providers severely. We present the solution to this problem that we developed for the Nexus system. The approach tolerates referential inconsistencies in the data while providing consistent query answers to users. For traversing references, we present a concept based on return references. This concept is especially suitable for infrequent object migrations and provides a good query performance. For scenarios where object migrations are frequent, we developed an alternative concept based on a distributed hash table.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-49&engl=1}
}
@inproceedings {INPROC-2008-46,
   author = {Thorsten Scheibler and Ralph Mietzner and Frank Leymann},
   title = {{EAI as a Service - Combining the Power of Executable EAI Patterns and SaaS}},
   booktitle = {International EDOC Conference (EDOC 2008)},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {September},
   year = {2008},
   language = {German},
   cr-category = {H.4.1 Office Automation},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {One of the predominant problems IT companies are facing today is Enterprise Application Integration (EAI). Most of the infrastructures built to tackle integration issues are proprietary because no standards exist for how to model, develop, and actually execute integration scenarios. Moreover, those systems are built on top of Pipes-and-Filters architecture that offers only limited capabilities for productive environments. As Service-oriented architectures (SOA) can be seen as de-facto standard for building enterprise systems today, including integration systems, there is a need to utilize those systems for executing integration scenarios. Business processes in an SOA environment can be used to integrate various applications to form an integration solution. Thus the application domain of BPM is significantly extended. In this paper, we introduce how integration solutions can be executed on BPM infrastructures. To demonstrate this we introduce a tool supporting integration architects to design integration scenarios and execute these solutions automatically.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-46&engl=1}
}
@inproceedings {INPROC-2008-32,
   author = {Sylvia Radesch{\"u}tz and Florian Niedermann and Bernhard Mitschang},
   title = {{Ein Annotationsansatz zur Unterst{\"u}tzung einer ganzheitlichen Gesch{\"a}ftsanalyse}},
   booktitle = {Proc. of the 5th Conference on Data Warehousing: Synergien durch Integration und Informationslogistik. (DW2008); St. Gallen, 27.-28. Oktober, 2008},
   publisher = {Lecture Notes in Informatics (LNI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--19},
   type = {Conference Paper},
   month = {October},
   year = {2008},
   language = {German},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques,     D.2.12 Software Engineering Interoperability,     H.4.1 Office Automation,     H.5.2 Information Interfaces and Presentation User Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die Verbesserung der Gesch{\"a}ftsprozesse in einem Unternehmen spielt eine immer wichtigere Rolle, um Wettbewerbsvorteile gegen{\"u}ber der Konkurrenz zu erlangen. Daf{\"u}r ist eine umfassende Analyse n{\"o}tig {\"u}ber alle verf{\"u}gbaren Informationen in diesem Unternehmen. Aktuelle Verfahren konzentrieren sich entweder auf die Analyse von Prozessdaten oder die Analyse von operativen Anwendungsdaten, die typischerweise in einem Data Warehouse vorliegen. F{\"u}r die Ausf{\"u}hrung einer tiefergehenden Analyse ist es jedoch notwendig, Prozessdaten und operative Daten zu verkn{\"u}pfen. Dieser Beitrag stellt zwei Ans{\"a}tze vor, welche es erm{\"o}glichen, diese Daten effektiv und flexibel zusammenzuf{\"u}hren. Der erste Ansatz stellt eine direkte Verkn{\"u}pfung von Entit{\"a}ten aus den Prozessdaten mit Entit{\"a}ten aus den operativen Daten her. Die Verkn{\"u}pfung im zweiten Ansatz beruht hingegen auf der semantischen Beschreibung der Daten. Beide Methoden sind in einem Werkzeug realisiert.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-32&engl=1}
}
@inproceedings {INPROC-2008-21,
   author = {Andreas Brodt and Daniela Nicklas},
   title = {{The TELAR mobile mashup platform for Nokia Internet Tablets}},
   booktitle = {EDBT '08: Proceedings of the 11th international conference on Extending database technology; Nantes, France, March 25-29, 2008},
   editor = {ACM},
   publisher = {ACM New York, NY, USA},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {ACM International Conference Proceeding Series},
   volume = {261},
   pages = {700--704},
   type = {Conference Paper},
   month = {March},
   year = {2008},
   doi = {10.1145/1353343.1353429},
   isbn = {978-1-59593-926-5},
   keywords = {location-based services, GPS, DCCI, mashup},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases,     H.5.1 Multimedia Information Systems,     H.5.4 Hypertext/Hypermedia},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2008-21/INPROC-2008-21.pdf},
   contact = {andreas.brodt@ipvs.uni-stuttgart.de, daniela.nicklas@uni-oldenburg.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {With the Web 2.0 trend and its participation of end-users more and more data and information services are online accessible, such as web sites, Wikis, or web services. The integration of this plethora of information is taken over by the community: so-called Mashups---web applications that combine data from more than one source into an integrated service---spring up like mushrooms, because they can be easily realized using script languages and web development platforms. Another trend is that mobile devices that get more and more powerful have ubiquitous access to the Web. Local sensors (such as GPS) can easily be connected to these devices. Thus, mobile applications can adapt to the current situation of the user, which can change frequently because of his or her mobility. In this demonstration, we present the Telar Mashup platform, a client-server solution that facilitates the creation of adaptive Mashups for mobile devices such as the Nokia Internet Tablets. On the server side, wrappers allow the integration of data from web-based services. On the client side, a simple implementation of the DCCI specification is used to integrate context information of local sensors into the mobile Web browser, which adapts the Mashup to the user's current location. We show an adaptive, mobile Mashup on the Nokia N810 Internet Tablet.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-21&engl=1}
}
@inproceedings {INPROC-2008-18,
   author = {Daniela Nicklas and Matthias Grossmann and Jorge Minguez and Mattias Wieland},
   title = {{Adding High-level Reasoning to Efficient Low-level Context Management: a Hybrid Approach}},
   booktitle = {Proceedings of the Sixth Annual IEEE Conference on Pervasive Computing and Communications : PerCom'08 Workshops, in 5th IEEE PerCom Workshop on Context Modeling and Reasoning; Hongkong, 17.-21. March 2008},
   address = {Los Alamitos - California, Washington, Tokyo},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {IEEE Computer Society},
   volume = {Order Number E3113},
   pages = {447--452},
   type = {Workshop Paper},
   month = {March},
   year = {2008},
   isbn = {0-7695-3113-X},
   isbn = {978-0-7695-3113-7},
   keywords = {higher level context; pervasive computing; ubiquitous computing; context-aware applications},
   language = {English},
   cr-category = {D.1.6 Logic Programming,     D.2.11 Software Engineering Software Architectures,     H.2.8 Database Applications},
   ee = {http://www.nexus.uni-stuttgart.de/COMOREA,     http://www.nexus.uni-stuttgart.de},
   contact = {Daniela Nicklas dnicklas@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Rule-based context reasoning is an expressive way to define situations, which are crucial for the implementation of many context-aware applications. Along the scenario of the Conference Guard application we show how this reasoning can be done both by leveraging an efficient context management (realized by the Nexus platform) and by a generic rule based service. We present the architecture of the Nexus semantic service, which uses the underlying definition of a low-level context model (the Nexus Augmented World Model) to carry out rules given in first order logic. We realize this service in a straight forward manner by using state-of-the-art software components (the Jena 2 framework) and evaluate the number of instances this approach can handle. Our first experiences show that a pre-selection of instances is necessary if the semantic service should work on a large-scale context model.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-18&engl=1}
}
@inproceedings {INPROC-2008-150,
   author = {Laura Kassner and Vivi Nastase and Michael Strube},
   title = {{Acquiring a Taxonomy from the German Wikipedia}},
   booktitle = {Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)},
   editor = {Nicoletta Calzolari},
   publisher = {European Language Resources Association (ELRA)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {May},
   year = {2008},
   isbn = {2-9517408-4-0},
   keywords = {taxonomy; ontology; taxonomy generation; ontology generation; semantic network; Wikipedia; WordNet; GermaNet; multilinguality},
   language = {English},
   cr-category = {I.2.4 Knowledge Representation Formalisms and Methods,     I.2.7 Natural Language Processing},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2008-150/INPROC-2008-150.pdf,     http://www.lrec-conf.org/proceedings/lrec2008/},
   contact = {laura.kassner@gsame.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This paper presents the process of acquiring a large, domain independent, taxonomy from the German Wikipedia. We build upon a previously implemented platform that extracts a semantic network and taxonomy from the English version of theWikipedia. We describe two accomplishments of our work: the semantic network for the German language in which isa links are identifed and annotated, and an expansion of the platform for easy adaptation for a new language. We identify the platform's strengths and shortcomings, which stem from the scarcity of free processing resources for languages other than English. We show that the taxonomy induction process is highly reliable - evaluated against the German version of WordNet, GermaNet, the resource obtained shows an accuracy of 83.34\%.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-150&engl=1}
}
@inproceedings {INPROC-2008-112,
   author = {Steffen Volz and Daniela Nicklas and Matthias Grossmann and Matthias Wieland},
   title = {{On creating a spatial integration schema for global, context-aware applications}},
   booktitle = {Proceedings of the X Brazilian Symposium on GeoInformatics (GeoInfo2008)},
   publisher = {INPE},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {December},
   year = {2008},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The world of spatial data is split into individual data source islands that have different thematic or spatial focuses. When attempting to integrate those data sources, severe challenges arise, since for most GIS application domains a spatial integration schema does not exist. This is also true for the newly emerging domain of mobile, context-aware applications. Since the users of these systems are mobile, transborder access to spatial data or context models is crucial for global deployment. The basis for this work is the Nexus Augmented World Schema, a conceptual schema that serves as an integration standard for autonomous spatial context servers. This paper analyzes some major spatial data standards, especially with respect to the requirements of a spatial integration schema for context-aware applications and illustrates the Nexus approach.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-112&engl=1}
}
@inproceedings {INPROC-2008-05,
   author = {Sylvia Radesch{\"u}tz and Bernhard Mitschang and Frank Leymann},
   title = {{Matching of Process Data and Operational Data for a Deep Business Analysis}},
   booktitle = {Proc. of the 4th International Conference on Interoperability for Enterprise Software and Applications (I-ESA 2008), Berlin, M{\"a}rz 26-28, 2008.},
   address = {London},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {171--182},
   type = {Conference Paper},
   month = {March},
   year = {2008},
   doi = {10.1007/978-1-84800-221-0_14},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   ee = {http://www.aidima.es/iesa2008/},
   department = {University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Efficient adaptation to new situations of a company's business and its business processes plays an important role for achieving advantages in competition to other companies. For an optimization of processes, a profound analysis of all relevant information in the company is necessary. Analyses typically specialize either on process analysis or on data warehousing of operational data. A consolidation of business data is needed, i.e. of internal process execution data and external operational data, in order to allow for interoperability between these major business data sources to analyze and optimize processes in a much more comprehensive scope. This paper introduces a framework that offers various data descriptions to reach an efficient matching of process data and operational data, and shows its enhancement compared to separate analyses and other matching approaches.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-05&engl=1}
}
@inproceedings {INPROC-2008-04,
   author = {Lu Jing and Mitschang Bernhard},
   title = {{A Constraint-Aware Query Optimizer for Web-based Data Integration}},
   booktitle = {Proceedings of the Fourth International Conference on Web Information Systems and Technologies, May 4-7, 2008.},
   address = {Funchal, Madeira, Portugal},
   publisher = {Conference Proceedings},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--6},
   type = {Conference Paper},
   month = {May},
   year = {2008},
   language = {English},
   cr-category = {H.3.5 Online Information Services},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Web has brought forth opportunities to connect information sources across all types of boundaries. The information sources include databases, XML documents, and other unstructured sources. Data integration is to combine data residing at different sources and providing the user with a unified view of these data. Currently users are expecting more efficient services from such data integration systems. Indeed, querying multiple data sources scattered on the web encounters many barriers for achieving efficiency due to the heterogeneity and autonomy of the information sources. This paper describes a query optimizer, which uses constraints to semantically optimize the queries. The optimizer first translates constraints from data sources into constraints expressed at the global level, e.g., in the common schema, and stores them in the constraint repository, again, at the global level. Then the optimizer can use semantic query optimization technologies including detection of empty results, join elimination, and predicate elimination to generate a more efficient but semantically equivalent query for the user. The optmizer is published as a web service and can be invoked by many data integration systems. We carry out experiments using our semantic query optimizer and first results show that performance can be greatly improved.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-04&engl=1}
}
@inproceedings {INPROC-2008-02,
   author = {Marko Vrhovnik and Holger Schwarz and Sylvia Radesch{\"u}tz and Bernhard Mitschang},
   title = {{An Overview of SQL Support in Workflow Products}},
   booktitle = {Proc. of the 24th International Conference on Data Engineering (ICDE 2008), Canc{\'u}n, M{\'e}xico, April 7-12, 2008},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {April},
   year = {2008},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Over the last years, data management products as well as workflow products have established themselves as indispensable building blocks for advanced IT systems in almost all application areas. Recently, many vendors have created innovative product extensions that combine service-oriented frameworks with powerful workflow and data management capabilities. In this paper, we discuss several workflow products from different vendors with a specific focus on their SQL support. We provide a comparison based on a set of important data management patterns and illustrate the characteristics of various approaches by means of a running example.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-02&engl=1}
}
@inproceedings {INPROC-2008-01,
   author = {Marko Vrhovnik and Holger Schwarz and Stephan Ewen and Oliver Suhre},
   title = {{PGM/F: A Framework for the Optimization of Data Processing in Business Processes}},
   booktitle = {Proc. of the 24th International Conference on Data Engineering (ICDE 2008), Canc{\'u}n, M{\'e}xico, April 7-12, 2008},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--4},
   type = {Conference Paper},
   month = {April},
   year = {2008},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Business process execution languages like BPEL are broadly adopted by industry to integrate the heterogeneous applications and data store of an enterprise. Leading vendors provide extensions to BPEL that allow for a tight integration of data processing capabilities into the process logic. Business processes exploiting these capabilities show a remarkable potential for optimization. In this demonstration, we present PGMOF, a framework for the optimization of data processing in such business processes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-01&engl=1}
}
@inproceedings {INPROC-2007-66,
   author = {Mih{\'a}ly Jakob and Oliver Schiller and Holger Schwarz and Fabian Kaiser},
   title = {{flashWeb: Graphical Modeling of Web Applications for Data Management}},
   booktitle = {Tutorials, posters, panels and industrial contributions at the 26th International Conference on Conceptual Modeling - ER 2007, Auckland New Zealand, December 2007. Vol. 83},
   editor = {John Grundy and Sven Hartmann and Alberto H. F. Laender and Leszek Maciaszek and John F. Roddick},
   address = {Auckland, New Zealand},
   publisher = {ACS},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {59--64},
   type = {Conference Paper},
   month = {December},
   year = {2007},
   isbn = {978-1-920682-64-4},
   keywords = {Model-driven Web engineering; Web application modeling; Code Generation},
   language = {English},
   cr-category = {D.2.3 Software Engineering Coding Tools and Techniques,     D.2.11 Software Engineering Software Architectures,     H.4 Information Systems Applications,     H.5.4 Hypertext/Hypermedia},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2007-66/INPROC-2007-66.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This paper presents flashWeb, a Computer-Aided Web Engineering (CAWE) tool for the model-driven development of web applications that focus on data management. Present-day web applications, like on-line auction systems or enterprise web portals require comprehensive data access, data processing and data manipulation capabilities. However, existing web application development approaches treat data management operations as second-class citizens. They integrate data operations into existing models or derive them as a by-product of business processes. We argue that data management is an important part of the application logic hence we capture operations with an additional Operation Model. We show that the explicit modeling of operations provides many benefits that distinguish our solution from other approaches. We present the flashWeb development process utilizing a graphical notation for the models in use, a CAWE tool that supports the creation of the graphical models and a code generator that creates ready-to-run web applications.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-66&engl=1}
}
@inproceedings {INPROC-2007-64,
   author = {Nazario Cipriani and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
   title = {{Federated Spatial Cursors}},
   booktitle = {Proceedings of the IX Brazilian Symposium on Geoinformatics},
   address = {S{\~a}o Jos{\'e} dos Campos, Brazil},
   publisher = {Online},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {85--96},
   type = {Conference Paper},
   month = {November},
   year = {2007},
   isbn = {978-85-17-00036-2},
   keywords = {nexus; cursor; federation; spatial},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.3.4 Information Storage and Retrieval Systems and Software},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2007-64/INPROC-2007-64.pdf,     http://www.geoinfo.info/geoinfo2007/anais_geoinfo2007.pdf},
   contact = {Senden Sie eine E-mail an Nazario.Cipriani@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The usage of small mobile devices for data-intensive applications becomes more and more self-evident. As a consequence we have to consider these devices and their inherent characteristics in future system designs, like the limitations of memory and communication bandwidth. For example, when querying data servers for information, a mobile application can hardly anticipate the size of the result set. Our approach is to give more control over the data delivery process to the application, so that it can be adapted regarding its device status, the costs and availability of communication channels, and the user’s needs. This paper introduces a flexible and scalable approach by providing spatially federated cursor functionality. It is based on an open federation over a set of loosely coupled data sources that provide simple object retrieval interfaces.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-64&engl=1}
}
@inproceedings {INPROC-2007-61,
   author = {Fabian Kaiser and Holger Schwarz and Mih{\'a}ly Jakob},
   title = {{EXPOSE: Searching the Web for Expertise}},
   booktitle = {Proceedings of the 30th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, Amsterdam, The Netherlands, July 23-27, 2007.},
   editor = {Wessel Kraaij and Arjen P. de Vries and Charles L. A. Clarke and Norbert Fuhr and Noriko Kando},
   publisher = {ACM},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--1},
   type = {Conference Paper},
   month = {January},
   year = {2007},
   isbn = {978-1-59593-597-7},
   keywords = {Expert Finding; Search Engine; Information Retrieval; Web Search; Knowledge Management},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this demonstration we will present EXPOSE, our solution to finding experts on the web. We show how EXPOSE supports the user in diverse tasks throughout the whole search process and how using EXPOSE can improve the result quality compared to ad-hoc searches with common web search engines.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-61&engl=1}
}
@inproceedings {INPROC-2007-59,
   author = {Jing Lu and Bernhard Mitschang},
   title = {{DIS-CS: Improving Enterprise Data Integration by Constraint Service}},
   booktitle = {ISCA 20th INTERNATIONAL CONFERENCE ON COMPUTER APPLICATIONS IN INDUSTRY AND ENGINEERING, November 7-9, 2007, San Francisco, California, USA.},
   publisher = {The International Society for Computers and Their Applications},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {212--217},
   type = {Conference Paper},
   month = {November},
   year = {2007},
   isbn = {978-1-880843-65-9},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This paper presents an approach to provide a Constraint Service for XML-based Data Integration Systems. Constraints from local data sources and global constraints are expressed in a uniform constraint model based on Active XQuery and are stored in Constraint Repository. We introduce the concept of Constraint Wrapper and translate local constraints from data sources automatically into the uniform constraint model through Constraint Wrapper with the help of schema mapping information. The Constraint Service can be published as web service and be invoked by different Data Integration Systems. Through the Constraint Service, queries can be optimized, and global updates can be checked for validity and integrity. We establish the DIS-CS system to facilitate both the architecture and the implementation. We carry out experiments of Semantic Query Optimization using Constraints. The results show that the performance of the queries is greatly improved.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-59&engl=1}
}
@inproceedings {INPROC-2007-37,
   author = {Daniela Nicklas},
   title = {{Nexus—A Global, Active, and 3D Augmented Reality Model}},
   booktitle = {Photogrammetic Week '07},
   editor = {Dieter Fritsch},
   address = {Heidelberg},
   publisher = {Herbert Wichmann Verlag},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {325--334},
   type = {Conference Paper},
   month = {September},
   year = {2007},
   isbn = {978-3-87907-452-5},
   keywords = {Nexus; location-based services; Augmented Reality; Geographic Models; context-awareness},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2007-37/INPROC-2007-37.pdf,     http://www.nexus.uni-stuttgart.de},
   contact = {nicklas@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The proliferation of sensor technology, along with advances in wireless communication and mobile devices, allow context-aware applications. These applications need context information, which should be shared between different applications to reduce the effort of modeling, obtaining, and managing. In the Nexus project, a context sharing platform was developed that allows for global, open context access of different applications. In this paper, different aspects of this work are illustrated: how a global access can be achieved by a federation approach, how these models can be active to support event observation and notification, how the third dimension can be introduced in the modeling and finally, how this leads to advanced applications that augment our reality with virtual information. Finally, an outlook into the vision of the World Wide Space is given.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-37&engl=1}
}
@inproceedings {INPROC-2007-29,
   author = {Rodrigo Monteiro and Geraldo Zimbrao and Holger Schwarz and Bernhard Mitschang and Jano Souza},
   title = {{DWFIST: Leveraging Calendar-based Pattern Mining in Data Streams}},
   booktitle = {Proc. of the 9th International Conference on Data Warehousing and Knowledge Discovery (DaWaK 2007) Regensburg, Germany, 3-7 September, 2007},
   publisher = {-},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {438--448},
   type = {Conference Paper},
   month = {September},
   year = {2007},
   language = {English},
   cr-category = {H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Calendar-based pattern mining aims at identifying patterns on specific calendar partitions. Potential calendar partitions are for example: every Monday, every first working day of each month, every holiday. Providing flexible mining capabilities for calendar-based partitions is especially challenging in a data stream scenario. The calendar partitions of interest are not known a priori and at each point in time only a subset of the detailed data is available. We show how a data warehouse approach can be applied to this problem. The data warehouse that keeps track of frequent itemsets holding on different partitions of the original stream has low storage requirements. Nevertheless, it allows to derive sets of patterns that are complete and precise. This work demonstrates the effectiveness of our approach by a series of experiments.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-29&engl=1}
}
@inproceedings {INPROC-2007-28,
   author = {Marko Vrhovnik and Holger Schwarz and Oliver Suhre and Bernhard Mitschang and Volker Markl and Albert Maier and Tobias Kraft},
   title = {{An Approach to Optimize Data Processing in Business Processes}},
   booktitle = {Proc. of the 33rd International Conference on Very Large Data Bases (VLDB 2007), Vienna, Austria, September 23-28, 2007},
   publisher = {-},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--12},
   type = {Conference Paper},
   month = {September},
   year = {2007},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In order to optimize their revenues and profits, an increasing number of businesses organize their business activities in terms of business processes. Typically, they automate important business tasks by orchestrating a number of applications and data stores. Obviously, the performance of a business process is directly dependent on the efficiency of data access, data processing, and data management. In this paper, we propose a framework for the optimization of data processing in business processes. We introduce a set of rewrite rules that transform a business process in such a way that an improved execution with respect to data management can be achieved without changing the semantics of the original process. These rewrite rules are based on a semi-procedural process graph model that externalizes data dependencies as well as control flow dependencies of a business process. Furthermore, we present a multi-stage control strategy for the optimization process. We illustrate the benefits and opportunities of our approach through a prototype implementation. Our experimental results demonstrate that independent of the underlying database system performance gains of orders of magnitude are achievable by reasoning about data and control in a unified framework.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-28&engl=1}
}
@inproceedings {INPROC-2007-18,
   author = {Matthias Wieland and Oliver Kopp and Daniela Nicklas and Frank Leymann},
   title = {{Towards Context-Aware Workflows}},
   booktitle = {CAiSE´07 Proceedings of the Workshops and Doctoral Consortium Vol.2, Trondheim, Norway, June 11-15th, 2007},
   editor = {Barbara Pernici and Jon Atle Gulla},
   publisher = {Tapir Acasemic Press},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {577--591},
   type = {Workshop Paper},
   month = {June},
   year = {2007},
   isbn = {978-82-519-2246-3},
   keywords = {workflow systems; context-aware systems; ubiquitous systems; workflow modeling; development of context-aware applications; BPEL; Nexus},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   contact = {Matthias Wieland wielanms@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Context-aware applications adapt their behavior based on changes of the physical world, which is often obtained with a huge amount of sensors. Thus, the development of such applications is cumbersome, in particular the implementation of their often complex control flow. To ease the development of context-aware applications we present the concept of context-aware workflows. Thereafter we present an implementation of these concepts based on a standard workflow language. Context-aware workflows are not only interesting for the development of context-aware applications, but also enable workflow technology to be applied in new domains that are process oriented and yet not supported by workflow systems like production processes in the manufacturing industry. The concept of context-aware workflows is a first approach that enables modeling and execution of technical production processes with workflow systems normally used for business processes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-18&engl=1}
}
@inproceedings {INPROC-2007-125,
   author = {Nazario Cipriani and Matthias Gro{\ss}mann and Daniela Nicklas and Bernhard Mitschang},
   title = {{Federated Spatial Cursors}},
   booktitle = {IX Brazilian Symposium on Geoinformatics, 25-28 November, Campos do Jordao, Sao Paulo, Brazil},
   publisher = {INPE},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {85--96},
   type = {Conference Paper},
   month = {November},
   year = {2007},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems,     H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The usage of small mobile devices for data-intensive applications becomes more and more self-evident. As a consequence we have to consider these devices and their inherent characteristics in future system designs, like the limitations of memory and communication bandwidth. For example, when querying data servers for information, a mobile application can hardly anticipate the size of the result set. Our approach is to give more control over the data delivery process to the application, so that it can be adapted regarding its device status, the costs and availability of communication channels, and the user’s needs. This paper introduces a flexible and scalable approach by providing spatially federated cursor functionality. It is based on an open federation over a set of loosely coupled data sources that provide simple object retrieval interfaces.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-125&engl=1}
}
@inproceedings {INPROC-2007-108,
   author = {Ralf Wagner and Bernhard Mitschang},
   title = {{A Methodology and Guide for Effective Reuse in Integration Architectures for Enterprise Applications}},
   booktitle = {Distributed Objects and Applications (DOA) 2007 International Conference},
   publisher = {.},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {522--539},
   type = {Conference Paper},
   month = {November},
   year = {2007},
   language = {English},
   cr-category = {A.0 General Literature, General},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-108&engl=1}
}
@inproceedings {INPROC-2007-107,
   author = {Ralf Wagner and Bernhard Mitschang},
   title = {{Flexible Reuse of Middleware Infrastructures in Heterogeneous IT Environments}},
   booktitle = {Proceedings of the IEEE International Conference on Information Reuse and Integration},
   publisher = {.},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {323--328},
   type = {Conference Paper},
   month = {August},
   year = {2007},
   language = {English},
   cr-category = {A.0 General Literature, General},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-107&engl=1}
}
@inproceedings {INPROC-2007-106,
   author = {Ralf Wagner and Bernhard Mitschang},
   title = {{A Virtualization Approach for Reusing Middleware Adapters}},
   booktitle = {Proceedings of the Ninth International Conference on Enterprise Information Systems},
   publisher = {.},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {78--85},
   type = {Conference Paper},
   month = {June},
   year = {2007},
   language = {English},
   cr-category = {A.0 General Literature, General},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-106&engl=1}
}
@inproceedings {INPROC-2007-105,
   author = {Tobias Kraft and Holger Schwarz and Bernhard Mitschang},
   title = {{A Statistics Propagation Approach to Enable Cost-Based Optimization of Statement Sequences}},
   booktitle = {Proc. of the 11th East European Conference on Advances in Databases and Information Systems (ADBIS 2007), Varna, Bulgaria, September 29 - October 3, 2007},
   publisher = {-},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {267--282},
   type = {Conference Paper},
   month = {September},
   year = {2007},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-105&engl=1}
}
@inproceedings {INPROC-2007-104,
   author = {Tobias Kraft and Bernhard Mitschang},
   title = {{Statistics API: DBMS-Independent Access and Management of DBMS Statistics in Heterogeneous Environments}},
   booktitle = {Proc. of the 9th International Conference on Enterprise Information Systems (ICEIS 2007), Funchal, Madeira, Portugal, June 12-16, 2007},
   publisher = {-},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {5--12},
   type = {Conference Paper},
   month = {June},
   year = {2007},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-104&engl=1}
}
@inproceedings {INPROC-2007-103,
   author = {Tobias Kraft},
   title = {{A Cost-Estimation Component for Statement Sequences}},
   booktitle = {Proc. of the 33rd International Conference on Very Large Data Bases (VLDB 2007), Vienna, Austria, September 23-28, 2007},
   publisher = {-},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1382--1385},
   type = {Conference Paper},
   month = {September},
   year = {2007},
   language = {German},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-103&engl=1}
}
@inproceedings {INPROC-2007-03,
   author = {Clemens Dorda and Uwe Heinkel and Bernhard Mitschang},
   title = {{Improving Application Integration with Model-Driven Engineering}},
   booktitle = {Proceedings of International Conference on Information Technology and Management 2007 : ICITM 2007; Hong Kong, China, January 3-5, 2007},
   editor = {Chan Man-Chung and James N.K. Liu and Ronnie Cheung and Joe Zhou},
   address = {Hong Kong},
   publisher = {ISM Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {94--101},
   type = {Conference Paper},
   month = {January},
   year = {2007},
   isbn = {988-97311-5-0},
   keywords = {Enterprise Application Integration, Model-Driven Engineering, Software Lifecycle, EAI, MDA, MDE, UML, Unified Modeling Language},
   language = {English},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques,     D.2.13 Software Engineering Reusable Software,     I.6.5 Model Development},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2007-03/INPROC-2007-03.pdf},
   contact = {Write message to Clemens.Dorda@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Modern software for Enterprise Application Integration (EAI)provide tools for modeling integration scenarios. A drawback ofthese tools is the missing functionality to exchange or integratemodels of different EAI products. Consequently, developers candescribe real heterogeneous IT environments only partially. Ourgoal is to avoid the creation of these so-called ‘integrationislands’. For that purpose we present an approach whichintroduces an abstract view by technology-independent andmultivendor-capable modeling for both development andmaintenance. With this approach, we propose a toolset- andrepository-based refinement of the abstract view to automate theimplementation with real products and the deployment on realplatforms.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-03&engl=1}
}
@inproceedings {INPROC-2006-57,
   author = {Christoph Mangold and Holger Schwarz},
   title = {{Documents meet Databases: A System for Intranet Search}},
   booktitle = {13th International Conference on Management of Data (COMAD 2006), Delhi, India, December 14-16, 2006},
   editor = {L. V. S. Lakshmanan and P. Roy and A. K. H. Tung},
   address = {New Delhi},
   publisher = {Tata McGraw-Hill Publishing Company Limited},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {227--230},
   type = {Conference Paper},
   month = {December},
   year = {2006},
   isbn = {0-07-063374-6},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2006-57/INPROC-2006-57.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In enterprise intranets, information is encoded in documents and databases. Logically, the information in both worlds is tightly connected, however, on the system level there is usually a large gap. In this paper, we propose a system to retrieve documents in the enterprise intranet. The system is an extension to common text search. It does not only consider the content of documents but also it exploits the enterprise databases to determine the documents' context.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-57&engl=1}
}
@inproceedings {INPROC-2006-56,
   author = {Christoph Mangold and Holger Schwarz and Bernhard Mitschang},
   title = {{Symbiosis in the Intranet: How Document Retrieval Benefits from Database Information}},
   booktitle = {13th International Conference on Management of Data (COMAD 2006), December 14-16, 2006, Delhi, India},
   editor = {L. V. S. Lakshmanan and P. Roy and A. K. H. Tung},
   address = {New Delhi},
   publisher = {Tata McGraw-Hill Publishing Company Limited},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {201--204},
   type = {Conference Paper},
   month = {December},
   year = {2006},
   isbn = {0-07-063374-6},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2006-56/INPROC-2006-56.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The enterprise information space is split in two hemispheres. Documents contain unstructured or semistructured information; structured information is stored in databases. As regards the content, both kinds of information are complementary parts. However, enterprise information systems usually focus on one part, only. Our approach improves document retrieval in the intranet by exploiting the enterprise's databases. In particular, we exploit database information to describe the context of documents and exploit this context to enhance common full text search. In this paper, we show how to model and compute document context and present results on runtime performance},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-56&engl=1}
}
@inproceedings {INPROC-2006-54,
   author = {Thomas Schwarz and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
   title = {{Exploiting Type and Space in a Main Memory Query Engine}},
   booktitle = {Proceedings of the VIII Brazilian Symposium on GeoInformatics : GeoInfo2006 ; Campos do Jord{\~a}o, Brazil, November 19-22, 2006},
   editor = {Clodoveu Augusto Davis Junior and Antonio Miguel Vieira Monteiro},
   publisher = {INPE},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {35--52},
   type = {Conference Paper},
   month = {November},
   year = {2006},
   isbn = {9 788517 000270},
   keywords = {Main Memory Query Engine, Indexing, Spatial Index, Type Hierarchies, Deployable Query Engine},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.3.1 Content Analysis and Indexing,     H.2.8 Database Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2006-54/INPROC-2006-54.pdf},
   contact = {Thomas Schwarz schwarts@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {More and more spatial data is accessible over the web or through portals of wireless service providers. In this context the main selection criteria for the data are the type of the requested data objects and their position in the real world. Integration and performance issues are challenged by the need to process ad hoc queries in an interactive fashion. In this paper we investigate how a main memory query engine can be used to meet these requirements. It has the added benefit of being easily deployable to many components in a large-scale data integration system. Hence, we analyze how such a query engine can best exploit the query characteristics by employing an index structure that leverages spatial and type dimensions. In order to support query processing in the best possible way we investigate a specific multi-dimensional main memory index structure. Compared to the straightforward approach using separate indexes on type and position we can increase the performance up to almost an order of magnitude in several important usage scenarios. This requires to tweak the mapping of type IDs to values in the type dimension, which we discuss extensively. This enables the overall system to be used interactively, even with large data sets.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-54&engl=1}
}
@inproceedings {INPROC-2006-52,
   author = {Christoph Mangold and Holger Schwarz and Bernhard Mitschang},
   title = {{u38: A Framework for Database-Supported Enterprise Document-Retrieval}},
   booktitle = {Proceedings of the Tenth International Database Engineering \& Apllications Symposium (IDEAS2006), Delhi, India, December 11-14, 2006},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--8},
   type = {Conference Paper},
   month = {December},
   year = {2006},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In enterprises, information is encoded in documents and databases. Logically, the information in both worlds is tightly connected, however, on the system level there is usu- ally a large gap. In this paper, we propose a framework that improves document retrieval by exploiting available enter- prise databases. In particular, we use database information to model the context of documents and incorporate this con- text in our search framework. We present our framework architecture, its components and its major interfaces. The framework can be configured and enhanced at well-defined points and, hence, can easily be customized to other do- mains. We furthermore evaluate its core components. Our experiments show that the context-aware approach signifi- cantly improves the quality of search results.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-52&engl=1}
}
@inproceedings {INPROC-2006-49,
   author = {Mih{\'a}ly Jakob and Holger Schwarz and Fabian Kaiser and Bernhard Mitschang},
   title = {{Towards an operation model for generated web applications}},
   booktitle = {Workshop proceedings of the sixth international conference on Web engineering (MDWE 2006); Palo Alto, California, USA, July 2006},
   editor = {Association for Computing Machinery (ACM)},
   address = {New York},
   publisher = {ACM Press New York, NY, USA},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {July},
   year = {2006},
   language = {English},
   cr-category = {D.2.3 Software Engineering Coding Tools and Techniques,     D.2.11 Software Engineering Software Architectures,     H.4 Information Systems Applications,     H.5.4 Hypertext/Hypermedia},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This paper describes a new approach for the development of data-intensive web applications that depend on non-trivial data manipulation. E-Commerce web sites, on-line auction systems and large enterprise web portals fall into this category as they require comprehensive data access, data processing and data manipulation capabilities. However, existing methodologies mainly concentrate on modeling content, navigation and presentation aspects of read-only web sites. Approaches that consider modeling data operations incorporate them into existing models resulting in a less clear design. We argue that existing models are not sufficient to express complex operations that access or modify web application content. Therefore, we propose an additional Operation Model defining operations for data-intensive web applications. We also propose the utilization of a web application generator to create an Operation Layer based on this Operation Model.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-49&engl=1}
}
@inproceedings {INPROC-2006-48,
   author = {Mih{\'a}ly Jakob and Holger Schwarz and Fabian Kaiser and Bernhard Mitschang},
   title = {{Modeling and Generating Application Logic for Data-Intensive Web Applications}},
   booktitle = {Proceedings of the 6th international conference on Web engineering (ICWE2006); Palo Alto, California, USA, July 2006},
   editor = {Association for Computing Machinery (ACM)},
   address = {New York},
   publisher = {ACM Press New York, NY, USA},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {77--84},
   type = {Conference Paper},
   month = {July},
   year = {2006},
   language = {English},
   cr-category = {D.2.3 Software Engineering Coding Tools and Techniques,     D.2.11 Software Engineering Software Architectures,     H.4 Information Systems Applications,     H.5.4 Hypertext/Hypermedia},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This paper presents a new approach for the development of data-intensive web applications that depend on sophisticated application logic. E-Commerce web sites, on-line auction systems and large enterprise web portals fall into this category as they require comprehensive data access, data processing and data manipulation capabilities. However, existing methodologies mainly concentrate on modeling content, navigation and presentation aspects of read-only web sites. In our opinion these models are not sufficient to express complex operations that access or modify web application content. Therefore, we propose an additional Operation Model defining the application logic of a web application. We show that based on this model a significant part of a web application’s Operation Layer can be generated, still allowing the manual implementation of arbitrary additional functionality. We evaluate our approach and present experimental results based on a large example application for the area of innovation management.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-48&engl=1}
}
@inproceedings {INPROC-2006-47,
   author = {Matthias Wieland and Daniela Nicklas},
   title = {{Ein Framework f{\"u}r kontextbezogene Anwendungen in der Nexus-Plattform}},
   booktitle = {3. GI/ITG KuVS Fachgespr{\"a}ch: Ortsbezogene Anwendungen und Dienste},
   editor = {Institut f{\"u}r Informatik der Freien Universit{\"a}t Berlin},
   address = {Berlin},
   publisher = {Freie Universit{\"a}t Berlin, Universit{\"a}tsbibliothek},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {32--35},
   type = {Conference Paper},
   month = {September},
   year = {2006},
   isbn = {3-929619-39-3},
   keywords = {Umgebungsmodell; Framework; Kontext; Anwendung; Nexus},
   language = {German},
   cr-category = {H.4 Information Systems Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2006-47/INPROC-2006-47.pdf},
   contact = {Senden Sie eine E-Mail an matthias.wieland(at)iaas.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Im Rahmen des Nexus-Projekts wurden zahlreiche kontextbezogene Anwendungen entwickelt. Aus diesen Erfahrungen heraus wurde ein Framework erarbeitet, das die Entwicklung orts- und kontextbezogener Anwendungen durch geeignete Abstraktionen und Laufzeitbibliotheken unterst{\"u}tzt. Dieser Beitrag beschreibt den Aufbau und die Vorteile dieses Frameworks. Zum Schluss geht der Beitrag noch auf die zuk{\"u}nftige Entwicklung des Nexus-Projekts im Bereich Anwendungsunterst{\"u}tzung ein.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-47&engl=1}
}
@inproceedings {INPROC-2006-32,
   author = {Ralf Rantzau and Christoph Mangold},
   title = {{Laws for Rewriting Queries Containing Division Operators}},
   booktitle = {Proceedings of the 22nd International Conference on Data Engineering, ICDE 2006},
   editor = {Ling Liu and Andreas Reuter and Kyu-Young Whang and Jianjun Zhang},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {21--21},
   type = {Conference Paper},
   month = {April},
   year = {2006},
   language = {English},
   cr-category = {F.4.1 Mathematical Logic,     H.2.3 Database Management Languages},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2006-32/INPROC-2006-32.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Relational division, also known as small divide, is a derived operator of the relational algebra that realizes a many-to-one set containment test, where a set is represented as a group of tuples: Small divide discovers which sets in a dividend relation contain all elements of the set stored in a divisor relation. The great divide operator extends small divide by realizing many-to-many set containment tests. It is also similar to the set containment join operator for schemas that are not in first normal form. Neither small nor great divide has been implemented in commercial relational database systems although the operators solve important problems and many efficient algorithms for them exist. We present algebraic laws that allow rewriting expressions containing small or great divide, illustrate their importance for query optimization, and discuss the use of great divide for frequent itemset discovery, an important data mining primitive. A recent theoretic result shows that small divide must be implemented by special purpose algorithms and not be simulated by pure relational algebra expressions to achieve efficiency. Consequently, an efficient implementation requires that the optimizer treats small divide as a first-class operator and possesses powerful algebraic laws for query rewriting.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-32&engl=1}
}
@inproceedings {INPROC-2006-14,
   author = {Fabian Kaiser and Holger Schwarz and Mih{\'a}ly Jakob},
   title = {{Finding Experts on the Web}},
   booktitle = {Proceedings of the Second International Conference on Web Information Systems and Technologies, Set{\'u}bal, Portugal, April 11-13, 2006},
   editor = {Jos{\'e} Cordeiro and Vitor Pedrosa and Bruno Encarnacao and Joaquim Filipe},
   publisher = {INSTICC},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {363--368},
   type = {Conference Paper},
   month = {April},
   year = {2006},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper, we present an integrated approach on finding experts for arbitrary user defined topics on the World Wide Web. We discuss the special challenges that come along with this issue and why solely applying standard techniques and standard tools like Web search engines is not suitable. We point out the necessity for a dedicated expert search engine, based on a Focused Crawler. The main contribution of our work is an approach to integrate standard Web search engines into the process of searching for experts to utilize the search engines' knowledge about content and structure of the Web.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-14&engl=1}
}
@inproceedings {INPROC-2006-09,
   author = {Andre Blessing and Stefan Klatt and Daniela Nicklas and Steffen Volz and Hinrich Sch{\"u}tze},
   title = {{Language-Derived Information and Context Models}},
   booktitle = {Proceedings of 3rd IEEE PerCom Workshop on Context Modeling and Reasoning (CoMoRea) (at 4th IEEE International Conference on Pervasive Computing and Communication (PerCom'06))},
   publisher = {IEEE},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {January},
   year = {2006},
   keywords = {nlp nexus context modeling and reasoning},
   language = {German},
   cr-category = {H.2.1 Database Management Logical Design},
   ee = {http://www.nexus.uni-stuttgart.de},
   contact = {Andre Blessing Andre.Blessing@ims.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
   abstract = {There are a number of possible sources for information about the environment when creating or updating a context model, including sensorial input, databases, and explicit modeling by the system designer. Another source is natural language, either in the form of electronic text (e.g., the world wide web) or speech. In this paper, we investigate the implications for context models when some of their information is derived linguistically with an emphasis on the issues of hybrid models and mapping between entities in language and context model. We present a prototype that tests some of our ideas.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-09&engl=1}
}
@inproceedings {INPROC-2006-06,
   author = {Matthias Wieland and Frank Leymann and Lamine Jendoubi and Daniela Nicklas and Frank D{\"u}rr},
   title = {{Task-orientierte Anwendungen in einer Smart Factory}},
   booktitle = {Mobile Informationssysteme - Potentiale, Hindernisse, Einsatz. Proceedings MMS´06},
   editor = {Thomas Kirste and Birgitta K{\"o}nig-Ries and Key Pousttchi and Klaus Turowski},
   address = {Bonn},
   publisher = {Gesellschaft f{\"u}r Informatik},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Informatics (LNI)},
   volume = {P-76},
   pages = {139--143},
   type = {Conference Paper},
   month = {February},
   year = {2006},
   isbn = {3-88579-170-6},
   keywords = {Kontextbezogene Applikationen; Smart Factory; kontextbezogene Workflows},
   language = {German},
   cr-category = {H.4.2 Information Systems Applications Types of Systems},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2006-06/INPROC-2006-06.pdf,     http://www.nexus.uni-stuttgart.de/},
   contact = {Matthias Wieland wieland@informatik.uni-stuttgart.de, Daniela Nicklas nicklas@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Industrielle Fertigung und Fabrikbetrieb (IFF);     University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
   abstract = {In diesem Beitrag wird aufgezeigt, welche M{\"o}glichkeiten sich durch den Einsatz task-orientierter, explorativer Anwendungen im Umfeld einer Smart Factory ergeben. Nach einer kurzen Charakterisierung dieser Anwendungsklasse wird ein Szenario geschildert, das Wartungsaufgaben in einer Fabrik mit diesen Konzepten l{\"o}st. Daraus ergibt sich die Vision einer Smart Factory, in der die Gesch{\"a}ftsprozesse {\"u}ber ein Kontextmodell mit den technischen Prozessen der Produktionsstra{\ss}e gekoppelt werden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-06&engl=1}
}
@inproceedings {INPROC-2005-84,
   author = {Uwe Heinkel and Carmen Constantinescu and Bernhard Mitschang},
   title = {{Integrating Data Changes with Data from Data Service Providers}},
   booktitle = {Proceedings of the 18th International Conference on Computer Applications in Industry and Engineering (CAINE 2005)},
   publisher = {ICSA},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {146--151},
   type = {Conference Paper},
   month = {November},
   year = {2005},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases},
   contact = {Uwe.Heinkel@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In these days, enterprises are more and more confronted to fast changing and turbulent markets. In order to remain competitive, they have to quickly adapt themselves to these new situations. The integration solutions employed in such an environment enable the required agility, by using a loose and flexible integration architecture. We propose an integration solution based on the concept of propagating data changes from one information system to the affected information systems. This paper focuses on the question: how data from other data services can be accessed and exploited to enhance a data change propagation system. These services are based on a service-oriented architecture (SOA) using XML technologies (e.g. SOAP). We developed the Data Service Description Language (DSDL) to define the data structures of the data service. This description is used to create the above mentioned Transformation Scripts as well as to generate requests for accessing remote data. A layered system approach is introduced to facilitate both the architecture and its implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-84&engl=1}
}
@inproceedings {INPROC-2005-63,
   author = {Joos-Hendrik B{\"o}se and Stefan B{\"o}ttcher and Le Gruenwald and Evaggelia Pitoura and Peter Reiher and George Samaras and Thomas Schwarz and Can T{\"u}rker},
   title = {{04441 Working Group - Research Issues in Mobile Transactions}},
   booktitle = {Mobile Information Management},
   editor = {Margaret H. Dunham and Birgitta K{\"o}nig-Ries and Pitoura Evaggelia and Peter Reiher and Can T{\"u}rker},
   address = {Schloss Dagstuhl, Germany},
   publisher = {Internationales Begegnungs- und Forschungszentrum (IBFI},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Dagstuhl Seminar Proceedings},
   volume = {04441},
   type = {Conference Paper},
   month = {January},
   year = {2005},
   keywords = {Transactions; mobile clients; multi-hop wireless networks},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   ee = {http://drops.dagstuhl.de/opus/volltexte/2005/168/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This document discusses three scenarios for databases with mobile clients, summarizes typical applications and requirements for each of the three scenarios, and outlines the open research issues which should be solved within each of the three scenarios. While the first scenario consists of mobile clients that are connect to a wired network, the second scenario consists of a network of mobile clients with a single-hop distance to each other but without a wired network, and the third scenario considers a network of mobile clients some of which are in multi-hop distance.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-63&engl=1}
}
@inproceedings {INPROC-2005-62,
   author = {Susanne Boll and Martin Breunig and Nigel Davies and Christian S. Jensen and Birgitta K{\"o}nig-Ries and Rainer Malaka and Florian Matthes and Christoforo Panayiotou and Simonas Saltenis and Thomas Schwarz},
   title = {{04441 Working Grou - Towards a Handbook for User-Centred Mobile Application Design}},
   booktitle = {Mobile Information Management},
   editor = {Margaret H. Dunham and Birgitta K{\"o}nig-Ries and Pitoura Evaggelia and Peter Reiher and Can T{\"u}rker},
   address = {Schloss Dagstuhl, Germany},
   publisher = {Internationales Begegnungs- und Forschungszentrum (IBFI},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Dagstuhl Seminar Proceedings},
   volume = {04441},
   type = {Conference Paper},
   month = {January},
   year = {2005},
   keywords = {User-Centred Mobile Application Design},
   language = {English},
   cr-category = {D.2.10 Software Engineering Design},
   ee = {http://drops.dagstuhl.de/opus/volltexte/2005/166},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Why do we have difficulties designing mobile apps? Is there a ``Mobile RUP''?},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-62&engl=1}
}
@inproceedings {INPROC-2005-58,
   author = {Daniela Nicklas and Susanne B{\"u}rklen and Tobias Drosdol and Nicola H{\"o}nle},
   title = {{Benefits of Context Models in Smart Environments}},
   booktitle = {2. GI/ITG KuVS Fachgespr{\"a}ch Ortsbezogene Anwendungen und Dienste},
   editor = {J{\"o}rg Roth},
   address = {Hagen},
   publisher = {Fernuniversit{\"a}t Hagen},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Informatik Bericht},
   volume = {324},
   pages = {12--15},
   type = {Conference Paper},
   month = {June},
   year = {2005},
   keywords = {context models; smart environment; smart room; Nexus},
   language = {English},
   cr-category = {H.4 Information Systems Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2005-58/INPROC-2005-58.pdf,     http://dreamteam.fernuni-hagen.de/fg_lbs/meeting_2/meeting_2.html,     http://www.nexus.uni-stuttgart.de},
   contact = {daniela.nicklas@informatik.uni-stuttgart.de susanne.buerklen@informatik.uni-stuttgart.de tobias.drosdol@informatik.uni-stuttgart.de nicola.hoenle@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
   abstract = {Ongoing technologic advances drive the emergence of smart items, everyday objects with embedded microcomputers and communication capabilities. In a smart envi-ronment a multitude of such smart items exist to assist its users. In this paper, we will show how smart environments can benefit from the concepts of the Nexus platform, an open pervasive computing system that supports various kinds of context-aware applica-tions by providing a federated, potentially global context model.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-58&engl=1}
}
@inproceedings {INPROC-2005-57,
   author = {Christoph Mangold and Holger Schwarz and Bernhard Mitschang},
   title = {{Improving Intranet Search Engines Using Context Information from Databases}},
   booktitle = {Proceedings of the 14th ACM International Conference on Information and Knowledge Management (CIKM 2005), Bremen, Germany, October 31 - November 5, 2005},
   editor = {A. Chowdhury and N. Fuhr and M. Ronthaler and H.-J. Schek and W. Teiken},
   publisher = {ACM Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {349--350},
   type = {Conference Paper},
   month = {October},
   year = {2005},
   isbn = {1-59593-140-6},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2005-57/INPROC-2005-57.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Information in enterprises comes in documents and databases. From a semantic viewpoint, both kinds of information are usually tightly connected. In this paper, we propose to enhance common search-engines with contextual information retrieved from databases. We establish system requirements and anecdotally demonstrate how documents and database information can be represented as the nodes of a graph. Then, we give an example how we exploit this graph information for document retrieval.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-57&engl=1}
}
@inproceedings {INPROC-2005-36,
   author = {Mih{\'a}ly Jakob and Fabian Kaiser and Holger Schwarz},
   title = {{SEMAFOR: A Framework for an Extensible Scenario Management System}},
   booktitle = {Proc. of the IEEE International Engineering Management Conference (IEMC) 2005; 2005 in St. John's, Newfoundland, September 11-14, 2005},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--5},
   type = {Conference Paper},
   month = {September},
   year = {2005},
   language = {English},
   cr-category = {H.3 Information Storage and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The development of successful new products and services in highly dynamic business environments has become an extremely difficult task. Innovation managers have to utilize a considerable amount of enterprise-internal and enterprise-external information to judge the potential of new products, services and technologies. Scenario management is a powerful instrument to face this problem. Scenarios represent an intuitive concept to comprehend complex present-day and future situations. The scenario technique is a method for building such scenarios. Assessments of future business environments relying on structured scenarios enable innovation managers to target lucrative market segments and to select promising product ideas. However, diverse enterprise-internal and enterprise-external resources have to be utilized to assist the scenario development process. Last but not least, existing methods are often extremely time-consuming and existing tools for scenario development fail to provide a comprehensive solution as they are limited to certain steps in fixed workflows. In this paper, we propose a modular web-based framework for the flexible and efficient development and handling of scenarios. Key aspects of our framework are module-based enterprise-specific workflows, the integration of distributed human resources into the scenario development process and diverse interfaces to enterprise-internal and enterprise-external information sources. The framework is based on self-contained software modules that cover important steps of the scenario management process. This modularity allows the easy supplementation of existing 'scenario technique' methods with newly developed methods that are incorporated into modules and can be combined in a flexible way to fit enterprise-specific requirements.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-36&engl=1}
}
@inproceedings {INPROC-2005-33,
   author = {Carmen Constantinescu and Uwe Heinkel and Jan Le Blond and Stephan Schreiber and Bernhard Mitschang and Engelbert Westk{\"a}mper},
   title = {{Flexible Integration of Layout Planning and Adaptive Assembly Systems in Digital Enterprises}},
   booktitle = {Proceedings of the 38th CIRP International Seiminar on Manufacturing Systems (CIRP ISMS)},
   publisher = {CIRP},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {10--18},
   type = {Conference Paper},
   month = {May},
   year = {2005},
   language = {German},
   cr-category = {J.6 Computer-Aided Engineering,     C.2.4 Distributed Systems},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2005-33/INPROC-2005-33.pdf},
   contact = {Uwe.Heinkel@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The agility and adaptability of an enterprise becomes more and more a desired feature and a key factor of success. Especially manufacturing enterprises have to be able to respond quickly to both external and internal changes. This includes the ability to plan the optimal factory configuration and the assembly processes with little effort in short time. The tools of the Digital Factory support manufacturing enterprises shortening planning time and increasing planning quality. As a motivation of our work in the field of Enterprise Application Integration, a scenario is described, which reveals how a transformable manufacturing enterprise reacts to market changes with the support of digital tools. Motivated by our scenario we developed an integration solution called Stuttgart Integration Platform. A main role in our approach plays a solution for the Digital Factory, which stores all needed information about the planned facility layouts and assembly processes. The paper presents our central integration solution Champagne, and three integrated systems: the Digital Factory Solution, the Factory Planning Table and the Assembly Configuration Tool.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-33&engl=1}
}
@inproceedings {INPROC-2005-32,
   author = {Stefan Berger and Christoph Mangold and Sebastian Meyer and Engelbert Westk{\"a}mper},
   title = {{Knowledge Management in Assembly}},
   booktitle = {Proceedings of the 38th CIRP international seminar on manufacturing systems},
   publisher = {CIRP},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   type = {Conference Paper},
   month = {May},
   year = {2005},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Turbulent business environments force enterprises to ever faster answers and adaptations in order to secure their competitive ability. Especially mass customization can be seen as one driver for variable and even smaller number of pieces till lot size 1. Its impacts can be clearly noticed e.g. in assembly where today changeover and set up processes define the daily business. In combination with ever more complex products and the operation of facilities in technological threshold the (re-)use of workers knowledge and experience get a key factor for mutability and responsibility. The article will show starting points for the handling of knowledge in assembly which have been researched within the SFB467-project 'Knowledge based management for the versatile assembly' at the University of Stuttgart.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-32&engl=1}
}
@inproceedings {INPROC-2005-17,
   author = {Rodrigo Salvador Monteiro and Geraldo Zimbrao and Holger Schwarz and Bernhard Mitschang and Jano Moreira De Souza},
   title = {{Building the Data Warehouse of Frequent Itemsets in the DWFIST Approach}},
   booktitle = {Proceedings of the 15th International Symposium on Methodologies for Intelligent Systems Saratoga Springs, New York - May 25-28, 2005},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--9},
   type = {Conference Paper},
   month = {May},
   year = {2005},
   isbn = {3-540-25878-7},
   language = {English},
   cr-category = {H.2.7 Database Administration,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Some data mining tasks can produce such great amounts of data that we have to cope with a new knowledge management problem. Frequent itemset mining fits in this category. Different approaches were proposed to handle or avoid somehow this problem. All of them have problems and limitations. In particular, most of them need the original data during the analysis phase, which is not feasible for data streams. The DWFIST (Data Warehouse of Frequent ItemSets Tactics) approach aims at providing a powerful environment for the analysis of itemsets and derived patterns, such as association rules, without accessing the original data during the analysis phase. This approach is based on a Data Warehouse of Frequent Itemsets. It provides frequent itemsets in a flexible and efficient way as well as a standardized logical view upon which analytical tools can be developed. This paper presents how such a data warehouse can be built.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-17&engl=1}
}
@inproceedings {INPROC-2005-112,
   author = {Marko Vrhovnik},
   title = {{Update-Propagation in gestaffelten und verteilten Caches}},
   booktitle = {Beitragsband zum Studierenden-Programm bei der 11. Fachtagung ``Datenbanken f{\"u}r Business, Technologie and Web'', GI Fachbereich Datenbanken und Informationssysteme, Karlsruhe, 1. M{\"a}rz 2005},
   publisher = {Universit{\"a}t Magdeburg, Fakult{\"a}t f{\"u}r Informatik},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {43--45},
   type = {Conference Paper},
   month = {March},
   year = {2005},
   language = {German},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems,     H.3.3 Information Search and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2005-112/INPROC-2005-112.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In der Forschungsgruppe NEXUS der Universit{\"a}t Stuttgart wird eine offene Plattform f{\"u}r ortsbezogene Anwendungen entwickelt. Durch die Offenheit k{\"o}nnen beliebige Datenanbieter ihre Informationen durch die NEXUS-Plattform bereitstellen. Eine F{\"o}derations-Middleware verbirgt vor einer Anwendung die Verteilung der Daten und kombiniert Daten verschiedener Anbieter in geeigneter Weise. Zur Beschleunigung des Datenzugriffs werden in der NEXUS-Plattform Zwischenspeicher (Caches) eingesetzt, u.a. in der F{\"o}derations-Middleware, als auch in mobilen Endger{\"a}ten, auf denen NEXUS-Anwendungen typischerweise ausgef{\"u}hrt werden. Durch eine solche Staffelung und Verteilung von Caches k{\"o}nnen Daten ``n{\"a}her'' an eine Anwendung positioniert und entsprechend schneller geliefert werden. Um die Konsistenz zwischengespeicherter Daten sicherstellen zu k{\"o}nnen, m{\"u}ssen Aktualisierungen auch in den Caches vollzogen werden. In dieser Diplomarbeit wurde der L{\"o}sungsraum zur Propagation von Aktualisierungen (Updates) zu den jeweiligen Caches durchleuchtet. Dabei wurden verschiedene Cache-Konsistenzsemantiken erstellt und Strategien entwickelt, wie diese im NEXUS-System umgesetzt werden k{\"o}nnen. Ferner wurde untersucht, welche Auswirkungen die einzelnen L{\"o}-sungsans{\"a}tze auf die Autonomie der einzelnen Komponenten der NEXUS-Plattform haben.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-112&engl=1}
}
@inproceedings {INPROC-2005-111,
   author = {Albert Maier and Bernhard Mitschang and Frank Leymann and Wolfson Dan},
   title = {{On Combining Business Process Integration and ETL Technologies}},
   booktitle = {Datenbanksysteme in Business, Technologie und Web (BTW'05)},
   editor = {Gesellschaft f{\"u}r Informatik},
   publisher = {K{\"o}llen},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {533--546},
   type = {Conference Paper},
   month = {March},
   year = {2005},
   isbn = {3-88579-394-6},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.3 Information Search and Retrieval},
   ee = {http://btw2005.aifb.uni-karlsruhe.de/},
   department = {University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {On Combining Business Provess Integration and ETL Technologies},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-111&engl=1}
}
@inproceedings {INPROC-2005-110,
   author = {Cataldo Mega and Frank Wagner and Bernhard Mitschang},
   title = {{From Content Management to Enterprise Content Management}},
   booktitle = {Datenbanksysteme in Business, Technologie und Web},
   editor = {Gesellschaft f{\"u}r Informatik},
   publisher = {K{\"o}llen},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {596--613},
   type = {Conference Paper},
   month = {March},
   year = {2005},
   isbn = {3-88579-394-6},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper we will provide a step-by-step description on what it means to evolve the architecture of a traditional content management system into an Enterprise Content Management (ECMS) system, explain the differences of both systems and motivate that this transformation is necessary. By analyzing business scenarios in the realm of different content management domains, we will explain why today’s content management systems struggle when it comes to satisfy the need for performance, scalability and business resilience. Using the system design of IBM DB2 Content Manager as reference point we will outline and discuss some of the new key technical challenges found when promoting ondemand ECM services and look at their affordability. By detailing a few representative use cases we will perform a problem analysis, and an attempt will be made to present an enhanced ECM system design that makes use of a component ‚virtualization’ approach in order to allow for a dynamic services infrastructure to be setup and which capitalizes on proven peer-peer and grid technology.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-110&engl=1}
}
@inproceedings {INPROC-2005-06,
   author = {Mih{\'a}ly Jakob and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
   title = {{DCbot: Finding Spatial Information on the Web}},
   booktitle = {Proceedings of the 10th International Conference on Database Systems for Advanced Applications (DASFAA 2005)},
   address = {Beijing},
   publisher = {??},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {April},
   year = {2005},
   language = {German},
   cr-category = {H.2.8 Database Applications,     H.3.3 Information Search and Retrieval,     H.5.4 Hypertext/Hypermedia},
   ee = {http://www.nexus.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The WWW provides an overwhelming amount of information, which spatially indexed can be a valuable additional data source for location- based applications. By manually building a spatial index, only a fraction of the available resources can be covered. This paper introduces a system for the automatic mapping of web pages to geographical locations. Our web robot uses several sets of domain specific keywords, lexical context rules, that are automatically learned, and a hierarchical catalogue of geographical locations that provides exact geographical coordinates for locations. Spatially indexed web pages are used to construct Geographical Web Portals, which can be accessed by different location-based applications. In addition, we present experimental results demonstrating the quantity and the quality of automatically indexed web pages.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-06&engl=1}
}
@inproceedings {INPROC-2005-05,
   author = {Uwe-Philipp K{\"a}ppeler and Georg Kindermann and Daniela Nicklas and Nicola H{\"o}nle and Dominique Dudkowski},
   title = {{Shared Dynamic Context Models: Benefits for Advanced Sensor Data Fusion for Autonomous Robots}},
   booktitle = {Proceedings of Artificial Intelligence and Applications 2005; Innsbruck, Austria, February, 14-16, 2005},
   publisher = {IASTED},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {February},
   year = {2005},
   keywords = {Autonomous; Robots; Sensor; Fusion; Nexus; Context; Sensorfusion},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval,     I.2.9 Robotics},
   contact = {kaeppeler@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Image Understanding;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Information provided by a shared dynamic context model offers new possibilities in the realm of autonomous robots. The availability of external context information can be used by a robot to extend and to validate the locally acquired knowledge about its dynamic environment. A lot of helpful context information is already available in digital form and its quantity will increase rapidly, according to the vision of ubiquitous computing. In this paper we present the Nexus Platform capable of managing a global dynamic context model that can be addressed and accessed in an easy and uniform way by all kinds of context-aware applications (like robots). Advantages for an autonomous wheelchair robot using the Nexus Platform are depicted within an airport scenario. We further present a framework for a sensor fusion agent, able to perform multi-sensor data fusion with selective attention control, concerning the current situation of the environment.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-05&engl=1}
}
@inproceedings {INPROC-2005-04,
   author = {Nicola H{\"o}nle and Uwe-Philipp K{\"a}ppeler and Daniela Nicklas and Thomas Schwarz},
   title = {{Benefits Of Integrating Meta Data Into A Context Model}},
   booktitle = {Proceedings of 2nd IEEE PerCom Workshop on Context Modeling and Reasoning (CoMoRea) (at 3rd IEEE International Conference on Pervasive Computing and Communication (PerCom'05)); Hawaii, March 12, 2005},
   publisher = {IEEE},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {March},
   year = {2005},
   keywords = {meta data; context model; context-aware applications},
   language = {English},
   cr-category = {H.2.1 Database Management Logical Design},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Image Understanding},
   abstract = {Meta data—data about data—improves the value of the operational data by giving applications and users additional information on the data’s origin, its precision or staleness. We outline the benefits of modeling meta data in context models: it can be used for resource finding, enhanced data selection, trust and data quality issues and sensor fusion. We show how meta data included into an object-based context model influences the data modeling and the selection process in the query language. Finally, we describe our implementation of the presented functionality in the Nexus platform.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-04&engl=1}
}
@inproceedings {INPROC-2005-03,
   author = {Matthias Grossmann and Martin Bauer and Nicola H{\"o}nle and Uwe-Philipp K{\"a}ppeler and Daniela Nicklas and Thomas Schwarz},
   title = {{Efficiently Managing Context Information for Large-scale Scenarios}},
   booktitle = {Proceedings of the 3rd IEEE Conference on Pervasive Computing and Communications: PerCom2005; Kauai Island, Hawaii, March 8-12, 2005},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {March},
   year = {2005},
   language = {English},
   cr-category = {H.3.0 Information Storage and Retrieval General,     H.3.4 Information Storage and Retrieval Systems and Software},
   ee = {http://www.nexus.uni-stuttgart.de},
   contact = {matthias.grossmann@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Image Understanding;     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
   abstract = {In this paper, we address the data management aspect of large-scale pervasive computing systems. We aim at building an infrastructure that simultaneously supports many kinds of context-aware applications, ranging from room level up to nation level. This allembracing approach gives rise to synergetic benefits like data reuse and sensor sharing. We identify major classes of context data and detail on their characteristics relevant for efficiently managing large amounts of it. Based on that, we argue that for large-scale systems it is beneficial to have special-purpose servers that are optimized for managing a certain class of context data. In the Nexus project we have implemented five servers for different classes of context data and a very flexible federation middleware integrating all these servers. For each of them, we highlight in which way the requirements of the targeted class of data are tackled and discuss our experiences.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-03&engl=1}
}
@inproceedings {INPROC-2005-02,
   author = {Mih{\'a}ly Jakob and Matthias Grossmann and Nicola H{\"o}nle and Daniela Nicklas},
   title = {{DCbot: Exploring the Web as Value-added Service for Location-based Applications}},
   booktitle = {Proceedings of the 21st International Conference on Data Engineering, ICDE 2005, April 5-8, 2005, Tokyo, Japan},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {April},
   year = {2005},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.1 Content Analysis and Indexing,     H.3.3 Information Search and Retrieval},
   ee = {http://www.nexus.uni-stuttgart.de},
   contact = {mihaly.jakob@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Location-based applications need information that can be spatially accessed. Typically, this data is exspecially gathered and preprocessed in a particular way (e.g. in a spatial data base). Up to now most of these applications ignore an existing large information space, the World Wide Web. Web pages can be mapped to locations and then accessed by location-aware applications with spatial predicates. We want to automate the process of mapping web pages to locations because of the huge amount of data available in the WWW. Our web robot DCbot analyses web pages using pre-defined rules and spatial knowledge and maps them to locations. In the demonstration we will show some location mapping results of DCbot and, in addition, we will let DCbot scan locally stored web pages at demonstration time, so that effects of changes of the content can be shown.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-02&engl=1}
}
@inproceedings {INPROC-2004-44,
   author = {Carmen Constantinescu and Sergey Kornienko and Olga Kornienko and Uwe Heinkel},
   title = {{An agent-based approach to support the scalability of change propagation}},
   booktitle = {Proceedings of the ISCA 17th International Conference on PARALLEL AND DISTRIBUTED COMPUTING SYSTEMS},
   editor = {D.A. Bader and A. A. Khokhar},
   publisher = {ISCA},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {157--164},
   type = {Conference Paper},
   month = {September},
   year = {2004},
   isbn = {1-880843-52-8},
   language = {German},
   cr-category = {I.2.11 Distributed Artificial Intelligence,     H.3.4 Information Storage and Retrieval Systems and Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Image Understanding},
   abstract = {In this paper, we address aspects of the challenge facing the Data Integration solutions in the problem of increasing the scalability. We first overview our results in data integration and present our prototype. Searching for a motivation to employ the agent-based technology and envision how this technology can be applied to improve the system scalability represent the next step of our research. For that, we examine some formal definitions and metrics of scalability which fit the purpose of system description. The analysis of our data integration solution, a change propagation system called Champagne, identifies the system components having the most influence on the scalability problem. We propose to employ the agent-based technology to improve the scalability and perform some experiments which reveal our work.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-44&engl=1}
}
@inproceedings {INPROC-2004-42,
   author = {Thomas Schwarz and Markus Iofcea and Matthias Grossmann and Nicola H{\"o}nle and Daniela Nicklas and Bernhard Mitschang},
   title = {{On Efficiently Processing Nearest Neighbor Queries in a Loosely Coupled Set of Data Sources}},
   booktitle = {Proceedings of the 12th ACM International Symposium on Advances in Geographic Information System (ACM GIS 004), Washington D.C., November 12-13, 2004},
   editor = {ACM},
   publisher = {?},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {November},
   year = {2004},
   keywords = {Data integration, distributed query processing, federated database system, kNN, nearest neighbors, parallel query processing},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications,     H.3.3 Information Search and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-42/INPROC-2004-42.pdf},
   contact = {thomas.schwarz@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {We propose a family of algorithms for processing nearest neighbor (NN) queries in an integration middleware that provides federated access to numerous loosely coupled, autonomous data sources connected through the internet. Previous approaches for parallel and distributed NN queries considered all data sources as relevant, or determined the relevant ones in a single step by exploiting additional knowledge on object counts per data source. We propose a different approach that does not require such detailed statistics about the distribution of the data. It iteratively enlarges and shrinks the set of relevant data sources. Our experiments show that this yields considerable performance benefits with regard to both response time and effort. Additionally, we propose to use only moderate parallelism instead of querying all relevant data sources at the same time. This allows us to trade a slightly increased response time for a lot less effort, hence maximizing the cost profit ratio, as we show in our experiments. Thus, the proposed algorithms clearly extend the set of NN algorithms known so far.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-42&engl=1}
}
@inproceedings {INPROC-2004-41,
   author = {Daniela Nicklas and Nicola H{\"o}nle and Michael Moltenbrey and Bernhard Mitschang},
   title = {{Design and Implementation Issues for Explorative Location-based Applications: the NexusRallye}},
   booktitle = {Proceedings for the VI Brazilian Symposium on GeoInformatics: GeoInfo 2004; November 22-24, 2004},
   editor = {Gilberto Camara Cirano Iochpe},
   address = {Sao Jose dos Campos},
   publisher = {INPE},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {167--181},
   type = {Conference Paper},
   month = {November},
   year = {2004},
   isbn = {3-901882-20-0},
   keywords = {location-based services, context-awareness, mobile applications},
   language = {German},
   cr-category = {H.2.8 Database Applications,     H.5.3 Group and Organization Interfaces},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-41/INPROC-2004-41.pdf,     http://www.nexus.uni-stuttgart.de},
   contact = {danickla@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Explorative Location-based Applications (eLBA) define a new class of applications that rely on both positioning (i.e. location information) and georeferenced information in addition to a flexible and efficient system infrastructure that supports a mobile and ubiquitous usage. In this paper we define first a modeling framework to design eLBAs that builds on the concept of tasks as a very valuable system/user interaction and application structuring concept. In addition, we report on a system framework, the Nexus platform, that efficiently provides access to georeferenced information and positioning information. Our sample application, the NexusRallye, is used to exemplify important aspects of our solution platform and to show its advantages as compared to other approaches.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-41&engl=1}
}
@inproceedings {INPROC-2004-40,
   author = {Thomas Schwarz and Nicola H{\"o}nle and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
   title = {{Efficient Domain-Specific Information Integration in Nexus}},
   booktitle = {Proceedings of the 2004 VLDB Workshop on Information Integration on the Web : IIWeb-2004 ; Toronto, Canada, August 30, 2004},
   editor = {Hasan Davulcu and Nick Kushmerick},
   publisher = {online},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {122--127},
   type = {Conference Paper},
   month = {August},
   year = {2004},
   keywords = {Nexus; information integration; domain-specific},
   language = {English},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,     H.3.3 Information Search and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-40/INPROC-2004-40.pdf,     http://cips.eas.asu.edu/iiwebfinalproceedings/52.pdf,     http://cips.eas.asu.edu/iiweb-proceedings.html},
   contact = {thomas.schwarz@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper, we present the Nexus approach to efficient domain-specific integration of many loosely coupled data sources. A so called information maximizing mediation middleware (IMMM) has to cope with large data volumes and many queries, and at the same time achieve a tight semantic integration for the data instances. For efficiency and practicability reasons, we propose to use an extensible global schema and a limited domain-specific query language. This facilitates employing domain-specific semantic knowledge in the middleware: detect duplicates, merge multiple representations, aggregate and generalize information. Finally, we present a working prototype tailored to the domain of context-aware applications.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-40&engl=1}
}
@inproceedings {INPROC-2004-38,
   author = {Christian Becker and Daniela Nicklas},
   title = {{Where do spatial context-models end and where do ontologies start? A proposal of a combined approach}},
   booktitle = {Proceedings of the First International Workshop on Advanced Context Modelling, Reasoning and Management in conjunction with UbiComp 2004},
   editor = {Jadwiga Indulska and David De Roure},
   address = {Nottingham, England},
   publisher = {University of Southhampton},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {48--53},
   type = {Conference Paper},
   month = {September},
   year = {2004},
   isbn = {854328130},
   keywords = {Context-Models, Adaptation, Infrastructures for Context-Aware Computing, Ubiquitous Computing},
   language = {German},
   cr-category = {H.2.1 Database Management Logical Design},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-38/INPROC-2004-38.pdf},
   contact = {christian.becker@informatik.uni-stuttgart.de, daniela.nicklas@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Context-aware applications adapt their behavior depending on the state of the physical world along with other information representing context. This requires context management, i.e., the efficient management of context information and feasible context representations in order to allow reasoning. This paper discusses two common approaches, spatial context models and contextual ontologies, and argues for a combined approach providing the efficiency of context management through context models combined with the semantic expressiveness of ontologies.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-38&engl=1}
}
@inproceedings {INPROC-2004-30,
   author = {Tobias Kraft and Holger Schwarz},
   title = {{CHICAGO: A Test and Evaluation Environment for Coarse-Grained Optimization}},
   booktitle = {Proceedings of the 30th International Conference on Very Large Databases, Toronto, Canada, August 29th - September 3rd, 2004},
   publisher = {Morgan Kaufmann},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1345--1348},
   type = {Conference Paper},
   month = {August},
   year = {2004},
   isbn = {0-12-088469-0},
   language = {German},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Relational OLAP tools and other database applications generate sequences of SQL statements that are sent to the database server as result of a single information request issued by a user. Coarse-Grained Optimization is a practical approach for the optimization of such statement sequences based on rewrite rules. In this demonstration we present the CHICAGO test and evaluation environment that allows to assess the effectiveness of rewrite rules and control strategies. It includes a lightweight heuristic optimizer that modifies a given statement sequence using a small and variable set of rewrite rules.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-30&engl=1}
}
@inproceedings {INPROC-2004-29,
   author = {Frank D{\"u}rr and Nicola H{\"o}nle and Daniela Nicklas and Christian Becker and Kurt Rothermel},
   title = {{Nexus--A Platform for Context-Aware Applications}},
   booktitle = {1. GI/ITG Fachgespr{\"a}ch Ortsbezogene Anwendungen und Dienste.},
   editor = {J{\"o}rg Roth},
   address = {Hagen},
   publisher = {FernUniversit{\"a}t in Hagen},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Informatik-Berichte der FernUniversit{\"a}t in Hagen},
   volume = {317},
   pages = {15--18},
   type = {Conference Paper},
   month = {June},
   year = {2004},
   keywords = {Location-based Service; Context-aware System; Platform; Geocast},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems,     H.2.8 Database Applications,     H.3.4 Information Storage and Retrieval Systems and Software,     C.2.2 Network Protocols},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-29/INPROC-2004-29.pdf},
   contact = {Senden Sie eine E-Mail an frank.duerr@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper we present the Nexus Platform for context-aware applications. This platform allows to share the effort of setting up a global and detailed context model between different providers by federating their partial models. Applications can query data directly, use push-based communication through an event service, or use value-added services like a navigation or map service for special tasks. Additional context-aware services like hoarding or geocast can be implemented on basis of the platform. For the latter we present different approaches for addressing and efficient message forwarding based on the Nexus Platform.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-29&engl=1}
}
@inproceedings {INPROC-2004-24,
   author = {Tobias Drosdol and Thomas Schwarz and Martin Bauer and Matthias Gro{\ss}mann and Nicola H{\"o}nle and Daniela Nicklas},
   title = {{Keeping Track of ``Flying Elephants'': Challenges in Large-Scale Management of Complex Mobile Objects}},
   booktitle = {Proceedings of INFORMATIK 2004 - the Thirty-Fourth Annual Conference of the Gesellschaft f{\"u}r Informatik e.V.(GI); Ulm, Germany, September 20-24, 2004. Vol. 1},
   editor = {Peter Dadam and Manfred Reichert},
   address = {Bonn},
   publisher = {K{\"o}llen Druck+Verlag GmbH},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Informatics},
   volume = {P-50},
   pages = {288--292},
   type = {Conference Paper},
   month = {September},
   year = {2004},
   isbn = {3-88579-379-2},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems,     H.2.8 Database Applications,     H.3.4 Information Storage and Retrieval Systems and Software},
   contact = {Tobias Drosdol Tobias.Drosdol@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
   abstract = {The management of mobile objects like cars, persons, or workpieces in a factory is an important task in many context-aware environments. So far, most solutions can either cope with many small objects (few properties) or with a limited number of complex objects in a centralized way. In this paper, we face the challenge of managing a large number of bulky mobile objects (flying elephants). We state requirements, propose basic components, and discuss alternative architectures based on the main influencing factors like mobility and update rate.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-24&engl=1}
}
@inproceedings {INPROC-2004-19,
   author = {Thomas Schwarz and Nicola H{\"o}nle and Matthias Gro{\ss}mann and Daniela Nicklas},
   title = {{A Library for Managing Spatial Context Using Arbitrary Coordinate Systems}},
   booktitle = {Workshop on Context Modeling and Reasoning : CoMoRea'04 ; In: Workshops-Proceedings of the 2nd IEEE Conference on Pervasice Computing and Communications : PerCom2004 ; Orlando, Florida, March 14-17, 2004},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {48--52},
   type = {Conference Paper},
   month = {March},
   year = {2004},
   keywords = {coordinate transformation, basic geometry types, spatial reference system, data integration, library for context-aware applications},
   language = {English},
   cr-category = {I.3.5 Computational Geometry and Object Modeling,     H.2.8 Database Applications,     J.2 Physical Sciences and Engineering},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-19/INPROC-2004-19.pdf,     http://nexus.informatik.uni-stuttgart.de/COMOREA/,     http://www.percom.org/percom_2004/index.htm,     http://www.nexus.uni-stuttgart.de/},
   contact = {thomas.schwarz@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Since location is an important part of context, the management of spatial information is important for many context-aware applications, e.g. the position or the extent of users, sensors, rooms or buildings. Coordinates always have a coordinate system (CS) associated to them. Numerous CSs exist and a lot of them are commonly used, thus conversion becomes a necessity. We introduce a library that implements the OGC Simple Feature Specification and can dynamically cope with different CSs, enabling interoperability between applications, middleware components and data providers. We illustrate functions and features, describe a common CS determination algorithm and point out our lessons learned: avoid transformations, use existing standards but dare to extend them when needed.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-19&engl=1}
}
@inproceedings {INPROC-2004-02,
   author = {Othmar Lehmann and Martin Bauer and Christian Becker and Daniela Nicklas},
   title = {{From Home to World - Supporting Context-aware Applications through World Models}},
   booktitle = {Proceedings of the Second IEEE International Conference on Pervasive Computing and Communications},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {297--306},
   type = {Conference Paper},
   month = {March},
   year = {2004},
   keywords = {context; context-awareness; pervasive computing; ubiquitous computing; world model; Nexus},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.1 Database Management Logical Design,     H.3.4 Information Storage and Retrieval Systems and Software},
   ee = {http://www.percom.org/,     http://www.nexus.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In the vision of pervasive computing smart everyday objects communicate and cooperate to provide services and information to users. Interoperability between devices and applications not only requires common protocols but also common context management. In this paper we discuss requirements on the context management based on the Georgia Tech's Aware Home environment and the global context management perspective of the Nexus project. Our experiences with integrating the Aware Home Spatial Service into the Nexus platform show how federation concepts and a common context model can provide applications with uniform context information in different administrative and application domains.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-02&engl=1}
}
@inproceedings {INPROC-2003-40,
   author = {Christoph Mangold and Bernhard Mitschang},
   title = {{Enabling a Reuse Oriented Engineering Methodology}},
   booktitle = {Proceedings of the Second IASTED International Conference on Information and Knowledge Sharing},
   editor = {Wesley Chu},
   address = {Anaheim, Calgary, Zurich},
   publisher = {ACTA Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {6--11},
   type = {Conference Paper},
   month = {November},
   year = {2003},
   isbn = {0-88986-396-2},
   keywords = {Engineering Methodology; Reuse; Representation; Knowledge Engineering and Management},
   language = {English},
   cr-category = {H.1.1 Systems and Information Theory,     H.1.2 User/Machine Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In the domain of machine engineering the reuse of design data is an important but complex instrument to improve quality and shorten development time. The successful reuse of design data requires both, a machine engineering specific methodology and the support by appropriate information system technology. In this paper we introduce a machine engineering methodology that is based on several reuse stages. Our approach to support the methodology with an appropriate information system uses a simple graph based information model where reuse stages are re- flected as layers. We also show how reuse is represented in the model.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-40&engl=1}
}
@inproceedings {INPROC-2003-27,
   author = {Marcello Mariucci and Bernhard Mitschang},
   title = {{Extending Web Service Technology towards an Earth Observation Integration Framework}},
   booktitle = {Proceedings of the Forum Session at the First International Conference on Service Oriented Computing: ICSOC03; Trento, Italy, Dec. 15-18, 2003},
   editor = {Marco Aiello and Chris Bussler and Vincenzo D'Andrea and Jian. Yang},
   address = {Trento},
   publisher = {University of Trento},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {Technical Report, Information and Communication Technology, University of Trento},
   volume = {DIT-03-056},
   pages = {117--128},
   type = {Conference Paper},
   month = {November},
   year = {2003},
   keywords = {Earth Observation; Framework; Web Services; Repository; Workflow Management},
   language = {English},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques,     D.2.6 Software Engineering Programming Environments,     D.2.9 Software Engineering Management,     D.2.10 Software Engineering Design,     D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software,     H.3.4 Information Storage and Retrieval Systems and Software,     H.4 Information Systems Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-27/INPROC-2003-27.pdf,     ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-27/INPROC-2003-27.ps},
   contact = {mariucci@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper we describe the implementation of a service-based application integration solution for the complex domain of Earth Observation (EO) application systems. The presented approach is based on an EO integration framework. It supports the concatenation of disparate software applications to flexible EO process chains. Resulting EO services are provided to end users by means of Web Service technology. We demonstrate that current standard technology is not sufficient to dynamically publish and interactively invoke EO services over the Web. We describe necessary extensions and adaptations.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-27&engl=1}
}
@inproceedings {INPROC-2003-23,
   author = {Marcello Mariucci and Frank Wagner and Gunter Martens and Jens K{\"u}nzl},
   title = {{ARSENAL: Model-driven Earth Observation Integration Framework}},
   booktitle = {Proceedings of the Fifth International Conference on Information Integration and Web-based Applications \& Services: iiWAS '03, Demonstration Paper; Jakarta, Indonesia, September 15-17, 2003. Vol. 170},
   editor = {Gabriele Kotsis and Stephane Bressan and Barbara Catania and Ismail Khalil Ibrahim},
   publisher = {Oesterreichische Computer Gesellschaft},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {227--231},
   type = {Conference Paper},
   month = {September},
   year = {2003},
   isbn = {3-85403-170-10},
   keywords = {Implementation Architecture Prototype, Model-driven Architecture, Process-oriented Application Integration, Model-driven Integration Process, Repository System},
   language = {English},
   cr-category = {H.3.5 Online Information Services,     J.2 Physical Sciences and Engineering,     D.2.2 Software Engineering Design Tools and Techniques},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-23/INPROC-2003-23.pdf},
   contact = {For more information please contact mariucci@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {An Earth Observation (EO) integration framework is an application integration solution for sup-porting the development and execution of EO services. EO services are based on the intensive use of large data sets from space. They process raw EO data sets into increasingly specialized products until a certain level of quality is achieved. This processing requires the tight cooperation of several distributed experts, and intensive computation across a coordinated sequence of both, interactive and automatic processing steps. Appropriate examples for such EO services are the generation of weather forecasts, forest fire detection, and oil slick monitoring. EO services can be characterized as highly flexible structures, which constantly need to be adapted to evolving spacecraft and proc-essing technologies. We suggest a model-driven EO integration framework solution that adequately copes with the flexible development, customization, and execution of reusable EO services. Our prototype includes a comprehensive integration model that accurately handles system metadata throughout the software life cycle, and significantly enhances the EO service development process in terms of quality, reuse, and adaptability. The prototype employs repository technology for man-aging model related issues, as well as workflow and Web service technology for execution pur-poses. It is mainly built upon commercial products, which are seamlessly combined by appropriate 'glue' components.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-23&engl=1}
}
@inproceedings {INPROC-2003-22,
   author = {Marcello Mariucci and Clemens Dorda and Bernhard Mitschang},
   title = {{Design and Implementation of a Model-driven Earth Observation Integration Framework}},
   booktitle = {Proceedings of the Fifth International Conference on Information Integration and Web-based Applications \& Services: iiWAS '03; Jakarta, Indonesia, September 15-17, 2003. Vol. 170},
   editor = {Gabriele Kotsis and Stephane Bressan and Barbara Catania and Ismail Khalil Ibrahim},
   publisher = {Oesterreichische Computer Gesellschaft},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {215--225},
   type = {Conference Paper},
   month = {September},
   year = {2003},
   isbn = {3-85403-170-10},
   keywords = {Model-driven Architecture, Process-oriented Application Integration, Model-driven Integration Process, Repository System},
   language = {English},
   cr-category = {H.3.5 Online Information Services,     J.2 Physical Sciences and Engineering,     D.2.2 Software Engineering Design Tools and Techniques},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-22/INPROC-2003-22.pdf,     ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-22/INPROC-2003-22.ps},
   contact = {For more information please contact mariucci@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {An Earth Observation (EO) integration framework is an application integration solution for supporting the development and execution of EO services. EO services are based on the intensive use of large data sets from space, and require the tight cooperation of several distributed experts. They can be characterized as highly flexible structures, which constantly need to be adapted to evolving spacecraft and processing technologies. In this paper we introduce a model-driven approach for an EO integration framework. We describe a comprehensive integration model that adequately copes with the flexible development, customization, and execution of EO services. The accurate treatment of related model instances throughout the software life cycle significantly enhances the EO service development process in terms of quality, reuse, and adaptability. We discuss technological aspects for the realization of such an integration framework, and outline our prototype implementation that is mainly built upon commercial products. We demonstrate that such a model-driven approach can be realized by employing repository technology for managing model related issues, as well as workflow and Web service technology for execution purposes.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-22&engl=1}
}
@inproceedings {INPROC-2003-17,
   author = {Kurt Rothermel and Dieter Fritsch and Bernhard Mitschang and Paul J. K{\"u}hn and Martin Bauer and Christian Becker and Christian Hauser and Daniela Nicklas and Steffen Volz},
   title = {{SFB 627: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme}},
   booktitle = {Proceedings Informatik 2003},
   address = {Frankfurt},
   publisher = {Gesellschaft f{\"u}r Informatik},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {September},
   year = {2003},
   keywords = {Umgebungsmodelle; kontext-bezogene Systeme; Nexus; Spatial World Models; context-aware systems},
   language = {German},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems,     H.2.8 Database Applications,     H.3.4 Information Storage and Retrieval Systems and Software},
   ee = {http://www.nexus.uni-stuttgart.de},
   contact = {Kurt.Rothermel@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Kommunikationsnetze und Rechnersysteme (IKR);     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
   abstract = {Ziel des Sonderforschungsbereichs 627 ``Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme'' ist die Erforschung von Methoden und Verfahren f{\"u}r die Definition, die Verwaltung und die Nutzung von digitalen Umgebungsmodellen. Existierende Informationsr{\"a}ume werden mit komplexen Modellen der realen Welt verschr{\"a}nkt und erlauben so neuartige Anwendungen. Insbesondere die Klasse der ortsbezogenen Anwendungen und aktuelle Forschungsgebiete wie das Ubiquitous Computing k{\"o}nnen von solchen Umgebungsmodellen profitieren, oder werden durch sie erst erm{\"o}glicht.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-17&engl=1}
}
@inproceedings {INPROC-2003-16,
   author = {Daniela Nicklas and Matthias Grossmann and Thomas Schwarz},
   title = {{NexusScout: An Advanced Location-Based Application On A Distributed, Open Mediation Platform}},
   booktitle = {Proceedings of the 29th VLDB Conference, Berlin, Germany, 2003},
   publisher = {Morgan Kaufmann Publishers},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {0--1},
   type = {Conference Paper},
   month = {September},
   year = {2003},
   isbn = {0-12-722442-4},
   language = {English},
   cr-category = {A.0 General Literature, General},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This demo shows several advanced use cases of location-based services and demonstrates how these use cases are facilitated by a mediation middleware for spatial information, the Nexus Platform. The scenario shows how a mobile user can access location-based information via so called Virtual Information Towers, register spatial events, send and receive geographical messages or find her friends by displaying other mobile users. The platform facilitates these functions by transparently combining spatial data from a dynamically changing set of data providers, tracking mobile objects and observing registered spatial events.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-16&engl=1}
}
@inproceedings {INPROC-2003-04,
   author = {Tobias Kraft and Holger Schwarz and Ralf Rantzau and Bernhard Mitschang},
   title = {{Coarse-Grained Optimization: Techniques for Rewriting SQL Statement Sequences}},
   booktitle = {Proceedings of 29th International Conference on Very Large Data Bases (VLDB 2003), Berlin, September 9-12, 2003},
   publisher = {Morgan Kaufmann},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {488--499},
   type = {Conference Paper},
   month = {September},
   year = {2003},
   isbn = {0-12-722442-4},
   keywords = {SQL; Query Optimization; OLAP},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Relational OLAP tools and other database applications generate sequences of SQL statements that are sent to the database server as result of a single information request provided by a user. Unfortunately, these sequences cannot be processed efficiently by current database systems because they typically optimize and process each statement in isolation. We propose a practical approach for this optimization problem, called ``coarse-grained optimization,'' complementing the conventional query optimization phase. This new approach exploits the fact that statements of a sequence are correlated since they belong to the same information request. A lightweight heuristic optimizer modifies a given statement sequence using a small set of rewrite rules. Since the optimizer is part of a separate system layer, it is independent of but can be tuned to a specific underlying database system. We discuss implementation details and demonstrate that our approach leads to significant performance improvements.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-04&engl=1}
}
@inproceedings {INPROC-2003-03,
   author = {Bernhard Mitschang and Engelbert Westk{\"a}mper and Carmen Constantinescu and Uwe Heinkel and Benno L{\"o}ffler and Ralf Rantzau and Ralph Winkler},
   title = {{Divide et Impera: A Flexible Integration of Layout Planning and Logistics Simulation through Data Change Propagation}},
   booktitle = {Proceedings of the 36th CIRP International Seminar on Manufacturing Systems (CIRP ISMS 2003), June 03-05, 2003 Saarland University, Saarbr{\"u}cken, Germany},
   editor = {C. Weber and H. Bley and G. Hirt},
   address = {Saarbr{\"u}cken, Germany},
   publisher = {Saarland University},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {411--418},
   type = {Conference Paper},
   month = {June},
   year = {2003},
   isbn = {3-930429-58-6},
   keywords = {integration of information systems; XML technologies; facility layout planning; logistics simulation},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases,     J.6 Computer-Aided Engineering},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-03/INPROC-2003-03.pdf},
   contact = {Uwe.Heinkel@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {The turbulent markets lead to new challenges for today’s enterprises, they have to be transformable to stay competitive. Therefore, we developed a new approach that integrates Logistic Simulation and Layout Planning to fulfil the goal of improving the production system. Our approach is based on propagation and transformation of data changes concerning the continuous adaptation tasks among the Layout Planning and Logistics Simulation systems. Instead of relying on a tightly integrated global data schema, we connect systems only as far as required by building “bridges” between them. The systems that participate in the integration are kept autonomous. We use several state-of-the-art XML technologies in our integration system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-03&engl=1}
}
@inproceedings {INPROC-2003-02,
   author = {Ralf Rantzau},
   title = {{Processing Frequent Itemset Discovery Queries by Division and Set Containment Join Operators}},
   booktitle = {Proceedings of the ACM SIGMOD Workshop on Research Issues in Data Mining and Knowledge Discovery (DMKD), San Diego, California, USA, June 13, 2003},
   editor = {Mohammed Zaki and Charu Aggarwal},
   publisher = {Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Report No. 03-05},
   pages = {20--27},
   type = {Conference Paper},
   month = {June},
   year = {2003},
   keywords = {association rule discovery; relational division; set containment join},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-02/INPROC-2003-02.pdf,     http://www.cs.rpi.edu/~zaki/DMKD03/},
   contact = {rrantzau@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {SQL-based data mining algorithms are rarely used in practice today. Most performance experiments have shown that SQL-based approaches are inferior to main-memory algorithms. Nevertheless, database vendors try to integrate analysis functionalities to some extent into their query execution and optimization components in order to narrow the gap between data and processing. Such a database support is particularly important when data mining applications need to analyze very large datasets or when they need access current data, not a possibly outdated copy of it. We investigate approaches based on SQL for the problem of finding frequent itemsets in a transaction table, including an algorithm that we recently proposed, called Quiver, which employs universal and existential quantifications. This approach employs a table schema for itemsets that is similar to the commonly used vertical layout for transactions: each item of an itemset is stored in a separate row. We argue that expressing the frequent itemset discovery problem using quantifications offers interesting opportunities to process such queries using set containment join or set containment division operators, which are not yet available in commercial database systems. Initial performance experiments reveal that Quiver cannot be processed efficiently by commercial DBMS. However, our experiments with query execution plans that use operators realizing set containment tests suggest that an efficient processing of Quiver is possible.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-02&engl=1}
}
@inproceedings {INPROC-2003-01,
   author = {Christoph Mangold and Ralf Rantzau and Bernhard Mitschang},
   title = {{F{\"o}deral: Management of Engineering Data Using a Semistructured Data Model}},
   booktitle = {Proceedings of the International Conference on Enterprise Information Systems (ICEIS), Angers, France, April 2003},
   publisher = {Unknown},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {April},
   year = {2003},
   isbn = {972-98816-1-8},
   keywords = {product data management, semistructured data, integration, data modeling},
   language = {English},
   cr-category = {H.2 Database Management},
   contact = {christoph.mangold@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {The F{\"o}deral system is a flexible repository for the management, integration and modeling of product data. Current systems in this domain employ object-oriented data models. Whereas this is adequate for the management of product data, it proves insufficient for integration and modeling. Present semistructured data models, however, are suited ideally for integration, but data management and also modeling is a problem. In this paper we describe our approach to narrow down the gap between structured and semistructured data models. We present the F{\"o}deral information system which employs a new semistructured data model and show how this model can be employed in the context of management, integration, and modeling of engineering data.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-01&engl=1}
}
@inproceedings {INPROC-2002-42,
   author = {Bernhard Mitschang},
   title = {{A Necessity for CSCW in Design - The CHAMPAGNE Approach and Experience (invited)}},
   booktitle = {A Necessity for CSCW in Design - The CHAMPAGNE Approach and Experience},
   editor = {Uni Rio de Janiero},
   address = {Rio de Janiero},
   publisher = {The Seventh International Conference on Computer Supported Cooperative Work in Design},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {1--2},
   type = {Conference Paper},
   month = {September},
   year = {2002},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   contact = {Bernhard Mitschang Bernhard.Mitschang@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Data Propagation: A Necessity for CSCW in Design - The CHAMPAGNE Approach and Experience (invited), in: The Seventh International Conference on Computer Supported Cooperative Work in Design, Rio de Janeiro, Brasil, 2002.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-42&engl=1}
}
@inproceedings {INPROC-2002-41,
   author = {Aiko Frank and Bernhard Mitschang},
   title = {{A customizable shared information space to support concurrent design}},
   booktitle = {Computer in Industry},
   address = {Amsterdam},
   publisher = {Elsevier Science Publishers B. V.},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   volume = {48},
   pages = {45--57},
   type = {Conference Paper},
   month = {May},
   year = {2002},
   language = {English},
   cr-category = {H.5.3 Group and Organization Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Sharing data is an important aspect in distributed design environments and should be supported by an underlying system. Any synchronous access to data is conflict prone. Applying concurrency control and two phase commit are one option to be considered. But design processes also demand for cooperation between the designers. Negotiation about actions on the product under design and the early exchange of preliminary results are crucial issues. Controlled data access by itself does not fulfil all the needs for cooperation. We will present a new approach that relies on a concept and system model which integrates concurrent activities by a joint information space offering flexible protocols for cooperation on the shared objects. We will describe the customizability of the protocols to effectively support different cooperative scenarios.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-41&engl=1}
}
@inproceedings {INPROC-2002-18,
   author = {Carmen Constantinescu and Uwe Heinkel and Holger Meinecke},
   title = {{A Data Change Propagation System for Enterprise Application Integration}},
   booktitle = {The 2nd International Conference on Information Systems and Engneering (ISE 2002)},
   editor = {Waleed W. Smari and Nordine Melab and Shu-Ching Chen},
   address = {San Diego},
   publisher = {The Society for Modeling and Simulation International},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {129--134},
   type = {Conference Paper},
   month = {July},
   year = {2002},
   isbn = {1-56555-251-2},
   keywords = {information systems; integration of heterogeneous data sources; XML technology},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2002-18/INPROC-2002-18.pdf},
   contact = {carmen.constantinescu@informatik.uni-stuttgart.de oder uwe.heinkel@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Most enterprises have a diverse environment of heterogeneous and autonomous information systems. If the same data is relevant for several information systems, then data changes in one supplier system affect data stored in other demander systems. The process of exchanging changed data between systems, named change propagation, is based on dependencies established between these systems. The management of a single, integrated enterprise information system is often infeasible or too expensive, due to the autonomy of business units and the heterogeneity of their IT infrastructures. The solution is to support the enterprise by a generic approach able to manage data dependencies and to transform data stored in a source information system into data stored in the dependent information systems. We propose a loosely coupled system, called Stuttgart Information and Exploration System. Our prototype mainly consists of a data dependency specification tool, a propagation engine and a repository that stores all relevant objects for these components.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-18&engl=1}
}
@inproceedings {INPROC-2002-17,
   author = {Marcello Mariucci and Bernhard Mitschang},
   title = {{On Making RAMSES an Earth Observation Application Framework}},
   booktitle = {Proceedings of the 2nd International Conference on Information Systems and Engineering: ISE 2002; San Diego, California, July 14-18, 2002},
   editor = {Waleed W. Smari and Nordine Melab and Shu-Ching Chen},
   address = {San Diego},
   publisher = {The Society for Modeling and Simulation International (SCS)},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Simulation Series},
   volume = {34 (2)},
   pages = {67--72},
   type = {Conference Paper},
   month = {July},
   year = {2002},
   isbn = {1-56555-251-2},
   keywords = {Frameworks for Information Technologies, Software Architectures for Information Systems, Component-Based Designs, Service-Based Approaches},
   language = {English},
   cr-category = {H.4.m Information Systems Applications Miscellaneous},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2002-17/INPROC-2002-17.pdf},
   contact = {For further information, please send an email to mariucci@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {RAMSES is one of the first large-scale prototypes of an operational Earth Observation (EO) application system. It implements a complex infrastructure for the extensive support of a thematic EO application system, which focuses on the detection and monitoring of oil spills. Since EO application systems are usually built on top of a set of generic functions, this paper analyses and assesses the RAMSES infrastructure in order to form a generic EO application framework. This framework should mainly support the collaborative development and customization of emerging EO application systems by maximizing the use of already existing system facilities. Furthermore, it should support the flexible extension and rapid reconfiguration of workflows as the business changes. Results of our analyses show that the RAMSES infrastructure does not cover all requirements of an EO application framework. We therefore introduce advanced design concepts and propose a new framework architecture that structurally controls the inherent complexity of the interdisciplinary domain of EO application systems.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-17&engl=1}
}
@inproceedings {INPROC-2002-12,
   author = {Ralf Rantzau and Carmen Constantinescu and Uwe Heinkel and Holger Meinecke},
   title = {{Champagne: Data Change Propagation for Heterogeneous Information Systems}},
   booktitle = {Proceedings of the International Conference on Very Large Databases (VLDB); Demonstration Paper; Hong Kong, August 20-23, 2002},
   publisher = {Morgan Kaufmann},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {August},
   year = {2002},
   keywords = {data transformation; data integration; schema mapping},
   language = {English},
   cr-category = {H.2.5 Heterogeneous Databases},
   contact = {rrantzau@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Flexible methods supporting the data interchange between autonomous information systems are important for today's increasingly heterogeneous enterprise IT infrastructures. Updates, insertions, and deletions of data objects in autonomous information systems often have to trigger data changes in other autonomous systems, even if the distributed systems are not integrated into a global schema. We suggest a solution to this problem based on the propagation and transformation of data using several XML technologies. Our prototype manages dependencies between the schemas of distributed data sources and allows to define and process arbitrary actions on changed data by manipulating all dependent data sources. The prototype comprises a propagation engine that interprets scripts based on a workflow specification language, a data dependency specification tool, a system administration tool, and a repository that stores all relevant information for these tools.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-12&engl=1}
}
@inproceedings {INPROC-2002-05,
   author = {Ralf Rantzau},
   title = {{Frequent Itemset Discovery with SQL Using Universal Quantification}},
   booktitle = {Proceedings of the International Workshop on Database Technologies for Data Mining (DTDM); Prague, Czech Republic, March 2002},
   address = {Prague, Czech Republic},
   publisher = {unknown},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {51--66},
   type = {Conference Paper},
   month = {March},
   year = {2002},
   keywords = {data mining; association rules; relational division; mining and database integration},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications},
   contact = {rrantzau@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Algorithms for finding frequent itemsets fall into two broad classes: (1) algorithms that are based on non-trivial SQL statements to query and update a database, and (2) algorithms that employ sophisticated in-memory data structures, where the data is stored into and retrieved from flat files. Most performance experiments have shown that SQL-based approaches are inferior to main-memory algorithms. However, the current trend of database vendors to integrate analysis functionalities into their query execution and optimization components, i.e., ``closer to the data,'' suggests revisiting these results and searching for new, potentially better solutions. We investigate approaches based on SQL-92 and present a new approach called Quiver that employs universal and existential quantifications. This approach uses a table layout for itemsets, where a group of multiple records represents a single itemset. Hence, our vertical layout is similar to the popular layout used for the transaction table, which is the input of frequent itemset discovery. Our approach is particularly beneficial if the database system in use provides adequate strategies and techniques for processing universally quantified queries, unlike current commercial systems.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-05&engl=1}
}
@inproceedings {INPROC-2002-03,
   author = {Carmen Constantinescu and Uwe Heinkel and Ralf Rantzau and Bernhard Mitschang},
   title = {{A System for Data Change Propagation in Heterogeneous Information Systems}},
   booktitle = {Proceedings of the International Conference on Enterprise Information Systems (ICEIS), Volume I, Cuidad Real, Spain, April 2002},
   publisher = {ICEIS Press/Escola Superior de Technologia de Setubal, Portugal},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {73--80},
   type = {Conference Paper},
   month = {April},
   year = {2002},
   keywords = {enterprise application integration; manufacturing; repository; propagation},
   language = {English},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software},
   ee = {http://www.iceis.org},
   contact = {carmen.constantinescu@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, it is common that enterprises manage several mostly heterogeneous information systems to supply their production and business processes with data. There is a need to exchange data between the information systems while preserving system autonomy. Hence, an integration approach that relies on a single global en-terprise data schema is ruled out. This is also due to the widespread usage of legacy systems. We propose a system, called Propagation Manager, which manages dependencies between data objects stored in different information systems. A script specifying complex data transformations and other sophisticated activities, like the execution of external programs, is associated with each dependency. For example, an object update in a source system can trigger data transformations of the given source data for each destination system that depends on the object. Our system is implemented using current XML technologies. We present the archi-tecture and processing model of our system and demonstrate the benefit of our approach by illustrating an extensive example scenario.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-03&engl=1}
}
@inproceedings {INPROC-2002-01,
   author = {Ralf Rantzau and Leonard Shapiro and Bernhard Mitschang and Quan Wang},
   title = {{Universal Quantification in Relational Databases: A Classification of Data and Algorithms}},
   booktitle = {Proceedings of the International Conference on Extending Database Technology (EDBT), Prague, Czech Republic, March 2002},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Lecture Notes in Computer Science},
   volume = {2287},
   pages = {445--463},
   type = {Conference Paper},
   month = {March},
   year = {2002},
   isbn = {3-540-43324-4},
   keywords = {query processing; relational division; physical operators},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2002-01/INPROC-2002-01.ps,     http://www.springer.de/comp/lncs/index.html},
   contact = {rrantzau@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Queries containing universal quantification are used in many applications, including business intelligence applications. Several algorithms have been proposed to implement universal quantification efficiently. These algorithms are presented in an isolated manner in the research literature - typically, no relationships are shown between them. Furthermore, each of these algorithms claims to be superior to others, but in fact each algorithm has optimal performance only for certain types of input data. In this paper, we present a comprehensive survey of the structure and performance of algorithms for universal quantification. We introduce a framework for classifying all possible kinds of input data for universal quantification. Then we go on to identify the most efficient algorithm for each such class. One of the input data classes has not been covered so far. For this class, we propose several new algorithms. For the first time, we are able to identify the optimal algorithm to use for any given input dataset. These two classifications of input data and optimal algorithms are important for query optimization. They allow a query optimizer to make the best selection when optimizing at intermediate steps for the quantification problem.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2002-01&engl=1}
}
@inproceedings {INPROC-2001-70,
   author = {Albrecht Messner and Bernhard Mitschang},
   title = {{Leistungsbewertung f{\"u}r Application Server Technologie: ein parametrisierbarer Benchmark-Ansatz am Beispiel des Brokat Twister Application Servers.}},
   booktitle = {GI Jahrestagung (2) 2001. Bd. 2},
   editor = {Gesellschaft f{\"u}r Informatik e.V.},
   address = {Wien},
   publisher = {Gesellschaft f{\"u}r Informatik e.V.},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {909--915},
   type = {Conference Paper},
   month = {September},
   year = {2001},
   isbn = {3-85403-157-2},
   language = {German},
   cr-category = {H.2.2 Database Management Physical Design},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {E-Commerce: Systemunterst{\"u}tzung f{\"u}r den Umgang mit Daten und Prozessen in vernetzten Anwendungsumgebungen. Leistungsbewertung f{\"u}r Application Server Technologie: ein parametrisierbarer Benchmark-Ansatz am Beispiel des Brokat Twister Application Servers. 909-915},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-70&engl=1}
}
@inproceedings {INPROC-2001-44,
   author = {Daniela Nicklas and Christoph Pfisterer and Bernhard Mitschang},
   title = {{Towards Location-based Games}},
   booktitle = {Proceedings of the International Conference on Applications and Development of Computer Games in the 21st Century: ADCOG 21; Hongkong Special Administrative Region, China, November 22-23 2001},
   editor = {Alfred Loo Wai Sing and Wan Hak Man and Wong Wai and Cyril Tse Ning},
   address = {Hong Kong},
   publisher = {Division of Computer Studies, City University of Hong kong, Hong Kong SAR, China},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {61--67},
   type = {Conference Paper},
   month = {November},
   year = {2001},
   isbn = {924-442-199-4},
   keywords = {Nexus; Location-based Services; Games; Augmented World Model; Nexus Applications},
   language = {German},
   cr-category = {D.2.11 Software Engineering Software Architectures,     H.3.5 Online Information Services,     K.8 Personal Computing},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2001-44/INPROC-2001-44.pdf,     ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2001-44/INPROC-2001-44.ps,     http://www.nexus.uni-stuttgart.de},
   contact = {Daniela Nicklas danickla@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper we investigate the basic properties of location-based games. This new type of game is made possible by the recent advances of mobile computing hardware and infrastructure. Players act not by pressing buttons or moving pawns on a board, but by moving around themselves in the real world. We present a simple classification of location-based games, and show how these games can be designed and implemented. With some adaptations, game concepts from existing board and computer games can be mapped to make location-based games more interesting and fun to play. Our methods are demonstrated with three actual game examples. Further, common infrastructure requirements are deduced and we show how the open platform developed by the neXus working group fulfills them.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-44&engl=1}
}
@inproceedings {INPROC-2001-43,
   author = {Daniela Nicklas and Bernhard Mitschang},
   title = {{The Nexus Augmented World Model: An Extensible Approach for Mobile, Spatially-Aware Applications}},
   booktitle = {Proceedings of the 7th International Conference on Object-Oriented Information Systems : OOIS '01 ; Calgary, Canada, August 27-29, 2001},
   editor = {Yingxu Wang and Shushma Patel and Ronald Johnston},
   address = {London},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {392--401},
   type = {Conference Paper},
   month = {January},
   year = {2001},
   isbn = {1-85233-546-7},
   keywords = {Nexus; location-based services; location-aware; augmented world model},
   language = {English},
   cr-category = {H.2.1 Database Management Logical Design,     H.2.8 Database Applications,     H.3.5 Online Information Services},
   ee = {http://www.nexus.uni-stuttgart.de/},
   contact = {Daniela Nickals daniela.nicklas@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {How should the World Wide Web look like if it were for location-based information? And how would mobile, spatially aware applications deal with such a platform? In this paper we present the neXus Augmented World Model, an object oriented data model which plays a major role in an open framework for both providers of location-based information and new kinds of applications: the neXus platform. We illustrate the usability of the model with several sample applications and show the extensibility of this framework. At last we present a stepwise approach for building spatially aware applications in this environment.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-43&engl=1}
}
@inproceedings {INPROC-2001-42,
   author = {Michael Kessler and Gundolf Kiefer and Jens Leenstra and Knut Sch{\"u}nemann and Thomas Schwarz and Hans-Joachim Wunderlich},
   title = {{Using a Hierarchical DfT Methodology in High Frequency Processor Designs for Improved Delay Fault Testability}},
   booktitle = {Proceedings of the International Test Conference : ITC 2001 ; Baltimore, Maryland, October 30-November 1, 2001},
   publisher = {IEEE Computer Society Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {461--469},
   type = {Conference Paper},
   month = {October},
   year = {2001},
   isbn = {0-7803-7169-0},
   keywords = {hierarchical; DfT; BIST; testability; scan chain reordering},
   language = {English},
   cr-category = {B.8.1 Reliability, Testing, and Fault-Tolerance,     C.1 Processor Architectures,     C.4 Performance of Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Computer Science, Computer Architecture},
   abstract = {In this paper a novel hierarchical DfT methodology is presented which is targeted to improve the delay fault testability for external testing and scan-based BIST. After the partitioning of the design into high frequency macros, the analysis for delay fault testability already starts in parallel with the implementation at the macro level. A specification is generated for each macro that defines the delay fault testing characteristics at the macro boundaries. This specification is used to analyse and improve the delay fault testability by improving the scan chain ordering at macro-level before the macros are connected together into the total chip network. The hierarchical methodology has been evaluated with the instruction window buffer core of an out-of-order processor. It was shown that for this design practically no extra hardware is required.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-42&engl=1}
}
@inproceedings {INPROC-2001-41,
   author = {Daniela Nicklas and Matthias Gro{\ss}mann and Thomas Schwarz and Steffen (ifp) Volz and Bernhard Mitschang},
   title = {{A Model-Based, Open Architecture for Mobile, Spatially Aware Applications}},
   booktitle = {Proceedings of the 7th International Symposium on Spatial and Temporal Databases: SSTD 2001; Redondo Beach, CA, USA, July 12-15, 2001},
   editor = {Christian S. Jensen and Markus Schneider and Bernhard Seeger and Vassilis J. Tsotras},
   address = {Berlin, Heidelberg, New York},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Computer Science},
   volume = {2121},
   pages = {117--135},
   type = {Conference Paper},
   month = {July},
   year = {2001},
   isbn = {3-540-42301-X},
   keywords = {Mobile Computing; Location-Aware Applications; Augmented World Model},
   language = {English},
   cr-category = {H.2.1 Database Management Logical Design,     H.3.4 Information Storage and Retrieval Systems and Software,     H.3.5 Online Information Services},
   ee = {http://www.nexus.uni-stuttgart.de},
   contact = {daniela.nicklas@informatik.uni-stuttgart.de, matthias.grossmann@informatik.uni-stuttgart.de, thomas.schwarz@informatik.uni-stuttgart.de, steffen.volz@ifp.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
   abstract = {With the emerging availability of small and portable devices that are able to determine their position and to communicate wirelessly, mobile and spatially aware applications become feasible. These applications rely on information that is bound to locations. In this paper we present Nexus, a platform for such applications, which is open for both new applications and new information providers, similar to the World Wide Web. Distributed servers provide location-based information, which is federated to an integrated view for the applications. To achieve this goal, we present the concept of the Augmented World Model, which is a common data model for location-based information. We give an example to show how applications can use this platform.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-41&engl=1}
}
@inproceedings {INPROC-2001-40,
   author = {Jochen R{\"u}tschlin and G{\"u}nter Sauter and J{\"u}rgen Sellentin and Klaudia Hergula and Bernhard Mitschang},
   title = {{Komponenten-Middleware: Der n{\"a}chste Schritt zur Interoperabilit{\"a}t von IT-Systemen}},
   booktitle = {Tagungsband der 9. GI-Fachtagung ``Datenbanksysteme in B{\"u}ro, Technik und Wissenschaft'' (BTW 2001), 7.-9. M{\"a}rz 2001, Oldenburg},
   editor = {Andreas Heuer and Frank Leymann and Denny Priebe},
   address = {Berlin, Heidelberg, New York},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {322--331},
   type = {Conference Paper},
   month = {March},
   year = {2001},
   isbn = {3-540-41707-9},
   language = {German},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,     H.3.5 Online Information Services},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2001-40/INPROC-2001-40.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {In diesem Papier stellen wir eine erste Konzeption f{\"u}r eine komponentenbasierte Middleware vor. Dabei verwenden wir neutrale Daten- und Beschreibungsmodelle, um eine Abstraktion bzgl. bestehender Komponentenmodelle zu erlangen. Kernpunkte in unserer Architektur sind die Komponentenschnittstellen, das auf SOAP basierende Kommunikationsprotokoll und ein Corporate Repository.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-40&engl=1}
}
@inproceedings {INPROC-2001-39,
   author = {Jochen R{\"u}tschlin and J{\"u}rgen Sellentin and Bernhard Mitschang},
   title = {{Industrieller Einsatz von Application Server Technologie}},
   booktitle = {Informatik 2001: Wirtschaft und Wissenschaft in der Network Economy – Visionen und Wirklichkeit. Tagungsband der GI/OCG-Jahrestagung, 25.-28. September 2001, Universit{\"a}t Wien.},
   editor = {Kurt Bauknecht and Wilfried Brauer and Thomas M{\"u}ck},
   publisher = {{\"O}sterreichische Computer Gesellschaft},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {916--921},
   type = {Conference Paper},
   month = {September},
   year = {2001},
   isbn = {3-85403-157-2},
   keywords = {Enterprise Application Integration, EAI, Integrationsarchitektur, Middleware, Application Server, J2EE},
   language = {German},
   cr-category = {C.2.4 Distributed Systems,     D.2.11 Software Engineering Software Architectures,     D.2.12 Software Engineering Interoperability,     H.4.m Information Systems Applications Miscellaneous},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {In diesem Beitrag wollen wir anhand einer Integrationsarchitektur aus dem EAI-Umfeld motivieren und aufzeigen, wie Application Server Technologie sinnvoll bei der Zusammenf{\"u}hrung von Systemen in einer vernetzten Umgebung eingesetzt werden kann. Dazu stellen wir erst unsere bisherige Integrationsarchitektur vor und erl{\"a}utern an dieser einige Nachteile des traditionellen Vorgehens. Ein Abschnitt {\"u}ber Application Server und die J2EE-Bestrebungen leiten {\"u}ber zu einem Neuvorschlag der Integrationsarchitektur, realisiert auf Basis eben dieser Application Server Technologie.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-39&engl=1}
}
@inproceedings {INPROC-2001-38,
   author = {Jochen R{\"u}tschlin},
   title = {{Ein Portal - Was ist das eigentlich?}},
   booktitle = {Informatik 2001: Wirtschaft und Wissenschaft in der Network Economy – Visionen und Wirklichkeit. Tagungsband der GI/OCG-Jahrestagung, 25.-28. September 2001, Universit{\"a}t Wien.},
   editor = {Kurt Bauknecht and Wilfrie Brauer and Thomas M{\"u}ck},
   publisher = {{\"O}sterreichische Computer Gesellschaft},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {691--696},
   type = {Conference Paper},
   month = {September},
   year = {2001},
   isbn = {3-85403-157-2},
   keywords = {Portal,Portale},
   language = {German},
   cr-category = {H.5.2 Information Interfaces and Presentation User Interfaces},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2001-38/INPROC-2001-38.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {In diesem Beitrag soll der Versuch unternommen werden, den vagen Begriff eines Portals genauer zu spezifizieren. Dazu werden Intention und technische Bestandteile eines Portals er{\"o}rtert. Hilfreich dabei ist der Blick auf bestehende Systeme, die unter dem Begriff Portal laufen, um durch Generalisierung und Klassifikation einer Definition n{\"a}her zu kommen. In diesem Zusammenhang werden auch einige Ergebnisse aus einer in unserem Hause durchgef{\"u}hrten Evaluierung von drei Portal-Systemen vorgestellt. Als Ausblick werden einige Anforderungen angesprochen, die mit der heutigen Portal-Technologie gar nicht oder nur sehr schwer bzw. umst{\"a}ndlich zu realisieren sind.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-38&engl=1}
}
@inproceedings {INPROC-2001-37,
   author = {Carmen Constantinescu and Uwe Heinkel and Ralf Rantzau and Bernhard Mitschang},
   title = {{SIES - An Approach for a Federated Information System in Manufacturing}},
   booktitle = {Proceedings of the International Symposium on Information Systems and Engineering (ISE); Las Vegas, Nevada, USA, June 2001},
   publisher = {CSREA Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {269--275},
   type = {Conference Paper},
   month = {June},
   year = {2001},
   isbn = {1-892512-85-8},
   keywords = {enterprise application integration; manufacturing; federation; repository; propagation},
   language = {English},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software},
   contact = {carmen.constantinescu@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Many problems encountered in providing enterprise-wide information are related to the integration of databases and systems that have been independently developed and also to the management of changes and transformations of data from one database (or system) into another. A major requirement is to accommodate heterogeneity and at the same time to preserve the autonomy of the components. This paper presents our approach to a repository-driven federated system based on a propagation mechanism. The Stuttgart Information and Exploration System (SIES), is characterized by its main components: the Federation Manager, the Propagation Manager and the Re-pository System.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-37&engl=1}
}
@inproceedings {INPROC-2001-34,
   author = {Aiko Frank},
   title = {{Agent Protocols for Integration and Cooperation in a Design Application Framework}},
   booktitle = {Proceedings of the 2nd International Workshop on Software Agents and Workflow for Systems Interoperability, London, ON, Canada, July 14th, 2001},
   editor = {Zakaria Maamar and Weiming Shen and Hamada H. Ghenniwa},
   address = {London, Canada},
   publisher = {NRC Research Council Canada},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {31--38},
   type = {Conference Paper},
   month = {July},
   year = {2001},
   isbn = {0-660-18552-0},
   keywords = {Designflow; CSCW; data sharing; agent protocols},
   language = {English},
   cr-category = {H.4.1 Office Automation,     H.5.3 Group and Organization Interfaces,     J.6 Computer-Aided Engineering},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2001-34/INPROC-2001-34.pdf},
   contact = {frankao@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Design is a discipline, which requires support for the combination of different systems and tools, spontaneous interaction between designers, sharing of (design) data, and adaptability to altering conditions. When looking at design processes it is a demanding task to coordinate and organize the work of the different team members. The work of a single person not only depends upon the work of others, but can also influence the work of other designers as well. Correspondingly, patterns of cooperation are to be established to minimize or resolve resulting conflicts, support the concurrent use of data, and to coordinate the work process. In order to fulfill those requirements the ASCEND Designflow Model and its prototype CASSY offer a corresponding object model, an architecture combining workflow and groupware systems, and finally a protocol integration layer based on agent communication. This protocol layer helps to flexibly combine the functionality of the different systems and services, since it can be adapted to different application scenarios. In this paper, we will describe the concepts of the protocols and their implementation architecture, resulting in a generic protocol engine.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-34&engl=1}
}
@inproceedings {INPROC-2001-33,
   author = {Aiko Frank and Bernhard Mitschang},
   title = {{On Sharing of Objects in Concurrent Design}},
   booktitle = {Proceedings of the 6th International Conference on CSCW in Design (CSCWID), London, ON, Canada, July, 2001},
   editor = {Weiming Shen and Zongkai Lin and Jean-Paul Barth{\`e}s and Mohamed Kamel},
   address = {Ottawa, Canada},
   publisher = {NRC Research Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {71--76},
   type = {Conference Paper},
   month = {July},
   year = {2001},
   isbn = {0-660-18493-1},
   keywords = {Designflow; CSCW; data sharing; agent protocols},
   language = {English},
   cr-category = {H.4.1 Office Automation,     H.5.3 Group and Organization Interfaces,     J.6 Computer-Aided Engineering},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2001-33/INPROC-2001-33.pdf},
   contact = {frankao@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Sharing data is an important aspect in distributed design environments and should be supported by an underlying system. Any synchronous access to data is conflict prone. Applying concurrency control and two phase commit are an option to be considered. But design processes also demand cooperation between the designers. Negotiation about actions on the product under design and the early exchange of preliminary results are crucial issues. Controlled data access by itself doesn’t fullfil all the needs for cooperation. We will present a new approach that relies on a concept and system model which integrates concurrent activities by a common information space offering flexible protocols for cooperation on the shared objects. We will describe the customizability of the protocols to allow the approach to be adapted to different cooperative scenarios.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-33&engl=1}
}
@inproceedings {INPROC-2001-32,
   author = {Holger Schwarz and Ralf Wagner and Bernhard Mitschang},
   title = {{Improving the Processing of Decision Support Queries: The Case for a DSS Optimizer}},
   booktitle = {Proc. of the 2001 International Database Engineering \& Applications Symposium (IDEAS), July 16-18, 2001},
   editor = {Michel Adiba and Christine Collet and Bipin C. Desai},
   address = {Los Alamitos, Washington, Brussels, Tokyo},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {177--186},
   type = {Conference Paper},
   month = {July},
   year = {2001},
   isbn = {0-7695-1140-6},
   keywords = {Decision Support; OLAP; Data Warehouse},
   language = {English},
   cr-category = {H.4.2 Information Systems Applications Types of Systems},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2001-32/INPROC-2001-32.pdf},
   contact = {holger.schwarz@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Many decision support applications are built upon data mining and OLAP tools and allow users to answer information requests based on a data warehouse that is managed by a powerful DBMS. In this paper, we focus on tools that generate sequences of SQL statements in order to produce the requested information. Our thorough analysis revealed that many sequences of queries that are generated by commercial tools are not very efficient. An optimized system architecture is suggested for these applications. The main component is a DSS optimizer that accepts previously generated sequences of queries and remodels them according to a set of optimization strategies, before they are executed by the underlying database system. The advantages of this extended architecture are discussed and a couple of appropriate optimization strategies are identified. Experimental results are given, showing that these strategies are appropriate to optimize typical query sequences of an OLAP application.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-32&engl=1}
}
@inproceedings {INPROC-2000-18,
   author = {Marcello Mariucci and Christophe Caspar and Luigi Fusco and Yves Henaff and Michele Forte},
   title = {{RAMSES: An Operational Thematic EO-Application on Oil Spill Monitoring. System description}},
   booktitle = {Proceedings of the Conference on Earth Observation (EO) \& Geo-Spatial (GEO) Web and Internet Workshop 2000: EOGEO 2000; London, United Kingdom, April 17-19, 2000 ). Commitee on Earth Observation Satellites (CEOS). 2000.},
   address = {http},
   publisher = {//webtech.ceos.org/eogeo2000},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {April},
   year = {2000},
   keywords = {Earth Observation Application Systems; Web Application Server; Middleware; CORBA; JAVA; Oil Pollution},
   language = {English},
   cr-category = {H.2 Database Management,     H.4 Information Systems Applications,     J.2 Physical Sciences and Engineering,     E.1 Data Structures},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2000-18/INPROC-2000-18.ps,     http://webtech.ceos.org/eogeo2000},
   contact = {Please send an email to mariucci@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {RAMSES (Regional earth observation Application for Mediterranean Sea Emergency Surveillance) is a web-based operational thematic EO Application System for oil spill detection and monitoring. Involving many geographically distributed resources and competences, the system had to meet strong requirements in terms of platform-independency and expandability. In addition, because thematic applications using remote sensing data share a lot of commonalties, the system has been designed in a modular way to ease modules reusability. The fulfilment of these objectives was largely supported by recent technologies such as CORBA and Java. After defining the actors and services, this paper presents the architecture of the system. It then outlines further improvements that can be considered for the oil spill application itself as well as further steps required towards a full multi-application support system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2000-18&engl=1}
}
@inproceedings {INPROC-2000-17,
   author = {Jochen R{\"u}tschlin},
   title = {{The Requirements for a Component-based Architecture}},
   booktitle = {Proceedings of the ProSTEP Science Days 2000 ``SMART Engineering'', 13./14. September 2000 at DaimlerChrysler, Stuttgart Germany.},
   editor = {Reiner Anderl and Christine Frick and Alfred Katzenbach and Joachim Rix},
   publisher = {ProSTEP e.V.},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {252--260},
   type = {Conference Paper},
   month = {September},
   year = {2000},
   isbn = {3-8167-5585-2},
   keywords = {components, component model, framework, packaged software},
   language = {English},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,     H.3.5 Online Information Services},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2000-17/INPROC-2000-17.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today’s enterprises are going to concentrate more and more on their core business. They do not want to implement basic functionality again and again. That's why they are using packaged software products like SAP R/3, Dassault Systemes' ENOVIA, and so on. But the introduction of such software suites also brings in elements and information that are already available in the enterprise (and should remain in the legacy systems). In this paper, we will point out the problem on two typical architectural scenarios and give with this the motivation for a component-based architecture. Besides we propose an architecture and discuss the lacks of the current CORBA-, EJB- and COM-approaches.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2000-17&engl=1}
}
@inproceedings {INPROC-2000-01,
   author = {Clara Nippl and Ralf Rantzau and Bernhard Mitschang},
   title = {{StreamJoin: A Generic Database Approach to Support the Class of Stream-Oriented Applications}},
   booktitle = {Proceedings of the International Database Engineering \& Applications Symposium (IDEAS); Yokohama, Japan, September 2000},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {83--91},
   type = {Conference Paper},
   month = {September},
   year = {2000},
   isbn = {0 7695 0789 1},
   keywords = {database applications; data mining; database extensions; database operators},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2000-01/INPROC-2000-01.ps},
   contact = {rrantzau@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today many applications routinely generate large quantities of data. The data often takes the form of (time) series, or more generally streams, i.e. an ordered se-quence of records. Analysis of this data requires stream processing techniques which differ in significant ways from what current database analysis and query tech-niques have been optimized for. In this paper we present a new operator, called StreamJoin, that can efficiently be used to solve stream-related problems of various appli-cations, such as universal quantification, pattern recog-nition and data mining. Contrary to other approaches, StreamJoin processing provides rapid response times, a non-blocking execution as well as economical resource utilization. Adaptability to different application scenarios is realized by means of parameters. In addition, the StreamJoin operator can be efficiently embedded into the database engine, thus implicitly using the optimization and parallelization capabilities for the benefit of the ap-plication. The paper focuses on the applicability of StreamJoin to integrate application semantics into the DBMS.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2000-01&engl=1}
}
@inproceedings {INPROC-1999-30,
   author = {Hermann Ludwig M{\"o}ller and Marcello Mariucci and Bernhard Mitschang},
   title = {{Architecture Considerations for Advanced Earth Observation Application Systems}},
   booktitle = {Proceedings of the Second International Conference on Interoperating Geographic Information System: Interop '99; Zurich, Switzerland, March 10-12, 1999},
   editor = {Andrej V{\`e}kovski and Brassel Kurt E. and Schek Hans-J{\"o}rg},
   address = {Berlin, Heidelberg, New York, Barcelona, Hong Kong, London, Milan, Paris, Singapore},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Lecture Notes in Computer Science},
   volume = {1580},
   pages = {75--90},
   type = {Conference Paper},
   month = {March},
   year = {1999},
   isbn = {3-540-65725-8},
   keywords = {Distributed Information Systems; Earth Observation Systems; Applications; Interoperability; Middleware; CORBA},
   language = {English},
   cr-category = {H.2 Database Management,     H.4 Information Systems Applications,     J.2 Physical Sciences and Engineering,     E.1 Data Structures},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-30/INPROC-1999-30.pdf,     ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-30/INPROC-1999-30.ps},
   contact = {Please send an email to mariucci@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Application systems in the earth observation area can be characterised as distributed, platform-inhomogeneous, complex, and cost intensive information systems. In order to manage the complexity and performance requirements set by these application scenarios a number of architectural considerations have to be applied. Among others the most important ones are modularization towards a component architecture and interoperation within this component model. As will be described in this paper, both are mandatory to achieving a high degree of reusability and extensibility at the component level as well as to support the necessary scalability properties. In our paper we refer to the state of the art in earth observation application systems as well as to a prototype system that reflects to a high degree the above mentioned system characteristics.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-30&engl=1}
}
@inproceedings {INPROC-1999-28,
   author = {Aiko Frank},
   title = {{Towards an Activity Model for Design Applications}},
   booktitle = {Proceedings of the 14th Int'l. Conference April 7-9, 1999, Cancun, Mexico},
   editor = {R. Y. Lee},
   publisher = {ISCA},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {1--10},
   type = {Conference Paper},
   month = {April},
   year = {1999},
   isbn = {1-880843-27-7},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Towards an Activity Model for Design Applications.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-28&engl=1}
}
@inproceedings {INPROC-1999-27,
   author = {J{\"u}rgen Sellentin and Aiko Frank and Bernhard Mitschang},
   title = {{TOGA -- A Customizable Service for Data-Centric Collaboration}},
   booktitle = {Proceedings of the 11th Conference on Advanced Information Systems Engineering (CAiSE*99)},
   editor = {Matthias Jarke and Andreas Oberweis},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Lecture Notes in Computer Science},
   volume = {1626},
   pages = {301--316},
   type = {Conference Paper},
   month = {June},
   year = {1999},
   isbn = {3-540-66157-3},
   language = {English},
   cr-category = {H.2 Database Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {TOGA -- A Customizable Service for Data-Centric Collaboration.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-27&engl=1}
}
@inproceedings {INPROC-1999-26,
   author = {J{\"u}rgen Sellentin and Berhard Mitschang},
   title = {{Design and Implementation of a CORBA Query Service Accessing EXPRESS-based Data}},
   booktitle = {The 6th International Conference on Database Systems for Advanced Applications (DASFAA), Hsinchu, Taiwan, April 19-21, 1999},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {273--282},
   type = {Conference Paper},
   month = {April},
   year = {1999},
   keywords = {EXPRESS, CORBA},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     J.6 Computer-Aided Engineering},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-26/INPROC-1999-26.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {In this paper we describe the design and implementation of a CORBA Query Service targeted to access data that is defined by the EXPRESS data modeling language. EXPRESS is used primarily in engineering domains (like CAD/CAM and GIS) to describe mostly product model data (like parts explosion or product geometry). In order to bring query facilities for EXPRESS-based data to CORBA a number of design decisions have to be taken, although the CORBA Query Service is standardized by the OMG. Among the most important and performance-indicating decisions are the definition of an appropriate query language and the description of the query result data structures. In this paper we discuss solutions to these topics and report on the experiences gained in designing and implementing our first CORBA Query Service for EXPRESS-based Data.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-26&engl=1}
}
@inproceedings {INPROC-1999-25,
   author = {Stefan Sarstedt and G{\"u}nter Sauter and J{\"u}rgen Sellentin and Bernhard Mitschang},
   title = {{Integrationskonzepte f{\"u}r heterogene Anwendungssysteme bei DaimlerChrysler auf Basis internationaler Standards}},
   booktitle = {Datenbanksysteme in B{\"u}ro, Technik und Wissenschaft, GI-Fachtagung BTW 99, Freiburg im Breisgau, 1.-3. M{\"a}rz 1999},
   editor = {A. Buchmann},
   address = {Berlin, Heidelberg, New York},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Informatik aktuell},
   pages = {317--327},
   type = {Conference Paper},
   month = {March},
   year = {1999},
   isbn = {3-540-65606-5},
   keywords = {Funktionsintegration; API-Integration; Heterogenit{\"a}t; STEP; CORBA},
   language = {German},
   cr-category = {H.2.5 Heterogeneous Databases},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-25/INPROC-1999-25.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Aufbauend auf den Anforderungen von DaimlerChrysler und unter Verwendung der Standards STEP und CORBA wird eine Architektur und Vorgehensweise f{\"u}r die Integration von Daten und Funktionen heterogener Anwendndungssysteme entwickelt. Die eingebrachten Systemkonzepte sowie die dadurch zu erwartende Optimierung des Entwicklungsprozesses werden am Beispiel des Bereichs PKW-Entwicklung diskutiert.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-25&engl=1}
}
@inproceedings {INPROC-1999-24,
   author = {Michael Jaedicke and Bernhard Mitschang},
   title = {{User-Defined Table Operators: Enhancing Extensibility for ORDBMS}},
   booktitle = {VLDB'99, Proceedings of 25th International Conference on Very Large Data Bases, Edinburgh, Scotland, UK, September 7-10, 1999},
   publisher = {Morgan Kaufmann},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {494--505},
   type = {Conference Paper},
   month = {May},
   year = {1999},
   isbn = {1-55860-615-7},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   ee = {http://www3.informatik.tu-muenchen.de/public/projekte/sfb342/publications/99.SFB-Bericht.Multiop.ps.gz},
   contact = {Bernhard Mitschang mitsch@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Currently parallel object-relational database technology is setting the direction for the future of data management. A central enhancement of object-relational database technology is the possibility to execute arbitrary user-defined functions within SQL statements. We show the limits of this approach and propose user-defined table operators as a new concept that allows the definition and implementation of arbitrary user-defined N-ary database operators, which can be programmed using SQL or Embedded SQL (with some extensions). Our approach leads to a new dimension of extensibility that allows to push more application code into the server with full support for efficient execution and parallel processing. Furthermore it allows performance enhancements of orders of magnitude for the evaluation of many queries with complex user-defined functions as we show for two concrete examples. Finally, our implementation perception guarantees that this approach fits well into the architectures of commercial object-relational database management systems.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-24&engl=1}
}
@inproceedings {INPROC-1999-01,
   author = {Ralf Rantzau and Holger Schwarz},
   title = {{A Multi-Tier Architecture for High-Performance Data Mining}},
   booktitle = {Proceedings of the Conference Datenbanksysteme in B{\"u}ro, Technik und Wissenschaft (BTW 1999), Freiburg, Germany, March 1999},
   editor = {A. P. Buchmann},
   address = {Berlin, Heidelberg, New York},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Informatik aktuell},
   pages = {151--163},
   type = {Conference Paper},
   month = {March},
   year = {1999},
   isbn = {3-540-65606-5},
   language = {English},
   cr-category = {H.2.8 Database Applications},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-01/INPROC-1999-01.ps,     ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-01/INPROC-1999-01.pdf},
   contact = {rrantzau@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Data mining has been recognised as an essential element of decision support, which has increasingly become a focus of the database industry. Like all computationally expensive data analysis applications, for example Online Analytical Processing (OLAP), performance is a key factor for usefulness and acceptance in business. In the course of the CRITIKAL project (Client-Server Rule Induction Technology for Industrial Knowledge Acquisition from Large Databases), which is funded by the European Commission, several kinds of architectures for data mining were evaluated with a strong focus on high performance. Specifically, the data mining techniques association rule discovery and decision tree induction were implemented into a prototype. We present the architecture developed by the CRITIKAL consortium and compare it to alternative architectures.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-01&engl=1}
}
@inproceedings {INPROC-1998-20,
   author = {J{\"u}rgen Sellentin and Bernhard Mitschang},
   title = {{Data Intensive Intra- \& Internet Applications - An Example Using Java and CORBA in the World Wide Web}},
   booktitle = {Proceedings of the Fourteenth International Conference on Data Engineering, February 23-27, 1998, Orlando, Florida, USA},
   publisher = {IEEE},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {302--311},
   type = {Conference Paper},
   month = {February},
   year = {1998},
   isbn = {0-8186-8289-2},
   language = {English},
   cr-category = {H.4 Information Systems Applications,     H.2.4 Database Management Systems,     H.2.5 Heterogeneous Databases},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Intra/Internet technology has become a key issue in the development of modern systems. Nowadays it is not sufficient anymore to present static information sheets through the WWW, instead we need interactive applications that may even compute complex results or process large data sets. In this paper we describe a prototype based on Java and CORBA. Both represent modern concepts that have been developed to fulfill these requirements. Their combination results into the kind of data processing we want to apply to the WWW: First, portable, powerful, structured and even reusable client programs instead of cryptic HTML scripts, second, well defined interfaces, and third, efficient server processes separated from the WWW server and its CGI extensions. Communication is controlled by a fault tolerant CORBA layer, which also enables server development using a different language than Java. Besides a discussion of CORBA and its data shipping capabilities, we take a closer look at Java and its runtime behavior, and we report on the experiences gathered with our prototype system and its testbed application. This system has also been used to gather experiences with and to influence the new language binding of the Standard Data Access Interface (SDAI) of the Standard for the Exchange of Product Data (STEP, ISO 10303) to Java.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1998-20&engl=1}
}
@inproceedings {INPROC-1998-19,
   author = {Clara Nippl and Bernhard Mitschang},
   title = {{TOPAZ: a Cost-Based, Rule-Driven, Multi-Phase Parallelizer}},
   booktitle = {VLDB'98, Proceedings of 24rd International Conference on Very Large Data Bases, New York City, New York, USA, August 24-27, 1998},
   publisher = {Morgan Kaufmann},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {251--262},
   type = {Conference Paper},
   month = {August},
   year = {1998},
   isbn = {1-55860-566-5},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   contact = {Bernhard Mitschang mitsch@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Currently the key problems of query optimization are extensibility imposedby object-relational technology, as well as query complexity caused by forthcoming applications, such as OLAP. We propose a generic approach to parallelization, called TOPAZ. Different forms of parallelism are exploited to obtain maximum speedup combined with lowest resource consumption. The necessary abstractions w.r.t. operator characteristics and system architecture are provided by rules that are used by a cost-based, top-down search engine. A multi-phase pruning based on a global analysis of the plan efficiently guides the search process, thus considerably reducing complexity and achieving optimization performance. Since TOPAZ solely relies on the widespread concepts of iterators and datarivers common to (parallel) execution models, it fits as an enabling technology into most state-of-the-art (object-) relational systems.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1998-19&engl=1}
}
@inproceedings {INPROC-1998-18,
   author = {Michael Jaedicke and Bernhard Mitschang},
   title = {{On Parallel Processing of Aggregate and Scalar Functions in Object-Relational DBMS}},
   booktitle = {Proceedings ACM SIGMOD International Conference on Management of Data, Seattle, Washington, USA, June 2-4, 1998},
   publisher = {ACM Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {379--389},
   type = {Conference Paper},
   month = {June},
   year = {1998},
   isbn = {0-89791-995-5},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   contact = {Bernhard Mitschang mitsch@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays parallel object-relational DBMS are envisioned as the next great wave, but there is still a lack of efficient implementation concepts for some parts of the proposed functionality. Thus one of the current goals for parallel object-relational DBMS is to move towards higher performance. In this paper we develop a framework that allows to process user-defined functions with data parallelism. We will describe the class of partitionable functions that can be processed parallelly. We will also propose an extension which allows to speed up the processing of another large class of functions by means of parallel sorting. Functions that can be processed by means of our techniques are often used in decision support queries on large data volumes, for example. Hence a parallel execution is indispensable.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1998-18&engl=1}
}
@article {ART-2019-10,
   author = {Cornelia Kiefer and Peter Reimann and Bernhard Mitschang},
   title = {{QUALM: Ganzheitliche Messung und Verbesserung der Datenqualit{\"a}t in der Textanalyse}},
   journal = {Datenbank-Spektrum},
   publisher = {Springer Verlag},
   pages = {1--12},
   type = {Article in Journal},
   month = {June},
   year = {2019},
   doi = {https://doi.org/10.1007/s13222-019-00318-7},
   keywords = {Datenqualit{\"a}t; Textanalyse; Text Mining; Trainingsdaten; Semantische Ressourcen},
   language = {German},
   cr-category = {H.3 Information Storage and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Bestehende Ans{\"a}tze zur Messung und Verbesserung der Qualit{\"a}t von Textdaten in der Textanalyse bringen drei gro{\ss}e Nachteile mit sich. Evaluationsmetriken wie zum Beispiel Accuracy messen die Qualit{\"a}t zwar verl{\"a}sslich, sie (1) sind jedoch auf aufw{\"a}ndig h{\"a}ndisch zu erstellende Goldannotationen angewiesen und (2) geben keine Ansatzpunkte f{\"u}r die Verbesserung der Qualit{\"a}t. Erste dom{\"a}nenspezifische Datenqualit{\"a}tsmethoden f{\"u}r unstrukturierte Textdaten kommen zwar ohne Goldannotationen aus und geben Ansatzpunkte zur Verbesserung der Datenqualit{\"a}t. Diese Methoden wurden jedoch nur f{\"u}r begrenzte Anwendungsgebiete entwickelt und (3) ber{\"u}cksichtigen deshalb nicht die Spezifika vieler Analysetools in Textanalyseprozessen. In dieser Arbeit pr{\"a}sentieren wir hierzu das QUALM-Konzept zum qualitativ hochwertigen Mining von Textdaten (QUALity Mining), das die drei o.g. Nachteile adressiert. Das Ziel von QUALM ist es, die Qualit{\"a}t der Analyseergebnisse, z. B. bzgl. der Accuracy einer Textklassifikation, auf Basis einer Messung und Verbesserung der Datenqualit{\"a}t zu erh{\"o}hen. QUALM bietet hierzu eine Menge an QUALM-Datenqualit{\"a}tsmethoden. QUALM-Indikatoren erfassen die Datenqualit{\"a}t ganzheitlich auf Basis der Passung zwischen den Eingabedaten und den Spezifika der Analysetools, wie den verwendeten Features, Trainingsdaten und semantischen Ressourcen (wie zum Beispiel W{\"o}rterb{\"u}chern oder Taxonomien). Zu jedem Indikator geh{\"o}rt ein passender Modifikator, mit dem sowohl die Daten als auch die Spezifika der Analysetools ver{\"a}ndert werden k{\"o}nnen, um die Datenqualit{\"a}t zu erh{\"o}hen. In einer ersten Evaluation von QUALM zeigen wir f{\"u}r konkrete Analysetools und Datens{\"a}tze, dass die Anwendung der QUALM-Datenqualit{\"a}tsmethoden auch mit einer Erh{\"o}hung der Qualit{\"a}t der Analyseergebnisse im Sinne der Evaluationsmetrik Accuracy einhergeht. Die Passung zwischen Eingabedaten und Spezifika der Analysetools wird hierzu mit konkreten QUALM-Modifikatoren erh{\"o}ht, die zum Beispiel Abk{\"u}rzungen aufl{\"o}sen oder automatisch auf Basis von Text{\"a}hnlichkeitsmetriken passende Trainingsdaten vorschlagen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2019-10&engl=1}
}
@article {ART-2019-09,
   author = {Karoline Saatkamp and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann},
   title = {{Method, formalization, and algorithms to split topology models for distributed cloud application deployments}},
   journal = {Computing},
   publisher = {Springer Wien},
   pages = {1--21},
   type = {Article in Journal},
   month = {April},
   year = {2019},
   isbn = {10.1007/s00607-019-00721-8},
   keywords = {Application deployment; Distribution; Splitting; Multi-cloud; TOSCA},
   language = {English},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques},
   ee = {https://link.springer.com/article/10.1007/s00607-019-00721-8},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {For automating the deployment of applications in cloud environments, a variety of technologies have been developed in recent years. These technologies enable to specify the desired deployment in the form of deployment models that can be automatically processed by a provisioning engine. However, the deployment across several clouds increases the complexity of the provisioning. Using one deployment model with a single provisioning engine, which orchestrates the deployment across the clouds, forces the providers to expose low-level APIs to ensure the accessibility from outside. In this paper, we present an extended version of the split and match method to facilitate the division of deployment models to multiple models which can be deployed by each provider separately. The goal of this approach is to reduce the information and APIs which have to be exposed to the outside. We present a formalization and algorithms to automate the method. Moreover, we validate the practical feasibility by a prototype based on the TOSCA standard and the OpenTOSCA ecosystem.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2019-09&engl=1}
}
@article {ART-2019-07,
   author = {Manuel Fritz and Michael Behringer and Holger Schwarz},
   title = {{Quality-driven early stopping for explorative cluster analysis for big data}},
   journal = {Software-Intensive Cyber-Physical Systems},
   publisher = {Springer Berlin Heidelberg},
   pages = {1--12},
   type = {Article in Journal},
   month = {February},
   year = {2019},
   issn = {2524-8510},
   isbn = {2524-8529},
   doi = {10.1007/s00450-019-00401-0},
   keywords = {Clustering; Big Data; Early Stop; Convergence; Regression},
   language = {English},
   cr-category = {E.0 Data General,     H.2.8 Database Applications,     H.3.3 Information Search and Retrieval},
   ee = {https://link.springer.com/article/10.1007/s00450-019-00401-0},
   contact = {manuel.fritz@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Data analysis has become a critical success factor for companies in all areas. Hence, it is necessary to quickly gain knowledge from available datasets, which is becoming especially challenging in times of big data. Typical data mining tasks like cluster analysis are very time consuming even if they run in highly parallel environments like Spark clusters. To support data scientists in explorative data analysis processes, we need techniques to make data mining tasks even more efficient. To this end, we introduce a novel approach to stop clustering algorithms as early as possible while still achieving an adequate quality of the detected clusters. Our approach exploits the iterative nature of many cluster algorithms and uses a metric to decide after which iteration the mining task should stop. We present experimental results based on a Spark cluster using multiple huge datasets. The experiments unveil that our approach is able to accelerate the clustering up to a factor of more than 800 by obliterating many iterations which provide only little gain in quality. This way, we are able to find a good balance between the time required for data analysis and quality of the analysis results.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2019-07&engl=1}
}
@article {ART-2019-03,
   author = {Karoline Saatkamp and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann},
   title = {{An approach to automatically detect problems in restructured deployment models based on formalizing architecture and design patterns}},
   journal = {SICS Software-Intensive Cyber-Physical Systems},
   publisher = {Springer Berlin Heidelberg},
   pages = {1--13},
   type = {Article in Journal},
   month = {February},
   year = {2019},
   doi = {10.1007/s00450-019-00397-7},
   keywords = {Topology-based deployment model; Patterns; Problem detection; TOSCA; Logic programming, Prolog},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     D.2.2 Software Engineering Design Tools and Techniques,     D.2.12 Software Engineering Interoperability,     K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {For the automated deployment of applications, technologies exist which can process topology-based deployment models that describes the application's structure with its components and their relations. The topology-based deployment model of an application can be adapted for the deployment in different environments. However, the structural changes can lead to problems, which had not existed before and prevent a functional deployment. This includes security issues, communication restrictions, or incompatibilities. For example, a formerly over the internal network established insecure connection leads to security problems when using the public network after the adaptation. In order to solve problems in adapted deployment models, first the problems have to be detected. Unfortunately, detecting such problems is a highly non-trivial challenge that requires deep expertise about the involved technologies and the environment. In this paper, we present (i) an approach for detecting problems in deployment models using architecture and design patterns and (ii) the automation of the detection process by formalizing the problem a pattern solves in a certain context. We validate the practical feasibility of our approach by a prototypical implementation for the automated problem detection in TOSCA topologies.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2019-03&engl=1}
}
@article {ART-2018-07,
   author = {Eva Hoos and Pascal Hirmer and Bernhard Mitschang},
   title = {{Automated Creation and Provisioning of Decision Information Packages for the Smart Factory}},
   journal = {Complex Systems Informatics and Modeling Quarterly},
   publisher = {Online},
   volume = {15},
   pages = {72--89},
   type = {Article in Journal},
   month = {August},
   year = {2018},
   issn = {2255-9922},
   doi = {10.7250/csimq.2018-15.04},
   keywords = {Industry 4.0; Context-awareness; Data Provisioning},
   language = {English},
   cr-category = {H.0 Information Systems General},
   ee = {https://csimq-journals.rtu.lv/article/view/csimq.2018-15.04},
   contact = {Pascal.Hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2018-07&engl=1}
}
@article {ART-2018-06,
   author = {Christian Weber and Matthias Wieland and Peter Reimann},
   title = {{Konzepte zur Datenverarbeitung in Referenzarchitekturen f{\"u}r Industrie 4.0: Konsequenzen bei der Umsetzung einer IT-Architektur}},
   journal = {Datenbank-Spektrum},
   publisher = {Springer Berlin Heidelberg},
   volume = {18},
   number = {1},
   pages = {39--50},
   type = {Article in Journal},
   month = {March},
   year = {2018},
   issn = {1610-1995},
   doi = {10.1007/s13222-018-0275-z},
   keywords = {Industrie 4.0; Referenzarchitektur; Datenverarbeitung; RAMI4.0; IIRA},
   language = {German},
   cr-category = {H.4.0 Information Systems Applications General,     J.2 Physical Sciences and Engineering},
   ee = {https://link.springer.com/article/10.1007/s13222-018-0275-z},
   contact = {Senden Sie eine E-Mail an christian.weber@gsame.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {F{\"u}r produzierende Unternehmen stellt die effiziente Verarbeitung gro{\ss}er Datenmengen eine Herausforderung dar. Die Auswahl der richtigen Architekturkonzepte f{\"u}r IT-L{\"o}sungen zur Datenverarbeitung spielt dabei eine wichtige Rolle. Um die IT an den Herausforderungen von Industrie 4.0 auszurichten, stehen Unternehmen verschiedene Referenzarchitekturen internationaler Gremien zur Verf{\"u}gung. Die Hauptbeitr{\"a}ge dieses Artikels haben das Ziel, (i) einen {\"U}berblick {\"u}ber die wichtigsten Referenzarchitekturen f{\"u}r Industrie 4.0 (I4.0) zu geben und (ii) diese unter dem Aspekt der Datenverarbeitung zu untersuchen. Dazu werden die Referenzarchitekturen anhand von Datenverarbeitungsanforderungen f{\"u}r I4.0 betrachtet. Die Untersuchung zeigt, dass die I4.0-Referenzarchitekturen jeweils einen Teilbereich der Anforderungen abdecken und sich die Konzepte gegenseitig erg{\"a}nzen. (iii) Darauf aufbauend werden aus den Datenverarbeitungsanforderungen technische Konsequenzen abgeleitet und Architekturkonzepte f{\"u}r die Realisierung einer IT-Architektur f{\"u}r die Datenverarbeitung vorgestellt. Dadurch wird es IT-Architekten erm{\"o}glicht, einen Vergleich der Referenzarchitekturen hinsichtlich projektbezogener Anforderungen an die Datenverarbeitung vorzunehmen sowie geeignete Architekturentscheidungen zu treffen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2018-06&engl=1}
}
@article {ART-2017-10,
   author = {Ana Cristina Franco da Silva and Pascal Hirmer and Uwe Breitenb{\"u}cher and Oliver Kopp and Bernhard Mitschang},
   title = {{Customization and provisioning of complex event processing using TOSCA}},
   journal = {Computer Science - Research and Development},
   publisher = {Springer Berlin Heidelberg},
   pages = {1--11},
   type = {Article in Journal},
   month = {September},
   year = {2017},
   issn = {1865-2042},
   issn = {1865-2034},
   doi = {10.1007/s00450-017-0386-z},
   keywords = {Internet of Things; Complex event processing; Customization; TOSCA},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems,     D.2.12 Software Engineering Interoperability},
   ee = {https://link.springer.com/article/10.1007/s00450-017-0386-z},
   contact = {Ana-Cristina.Franco-da-Silva@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2017-10&engl=1}
}
@article {ART-2017-09,
   author = {Pascal Hirmer and Michael Behringer and Bernhard Mitschang},
   title = {{Partial execution of Mashup Plans during modeling time}},
   journal = {Computer Science - Research and Development},
   publisher = {Springer Berlin Heidelberg},
   pages = {1--12},
   type = {Article in Journal},
   month = {September},
   year = {2017},
   issn = {1865-2034},
   issn = {1865-2042},
   doi = {10.1007/s00450-017-0388-x},
   keywords = {Workflows; Modeling; BPEL; Partial execution; Data Mashups},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.0 Information Storage and Retrieval General,     E.1 Data Structures},
   ee = {https://link.springer.com/article/10.1007%2Fs00450-017-0388-x},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2017-09&engl=1}
}
@article {ART-2017-07,
   author = {Christian Weber and Jan K{\"o}nigsberger},
   title = {{Industrie 4.0: Aktuelle Entwicklungen f{\"u}r Analytics - Teil 2: Vergleich und Bewertung von Industrie 4.0-Referenzarchitekturen}},
   journal = {wt Werkstattstechnik online},
   publisher = {Springer-VDI-Verlag},
   volume = {107},
   number = {6},
   pages = {405--409},
   type = {Article in Journal},
   month = {June},
   year = {2017},
   keywords = {IT Architecture; Analytics; Edge Analytics; Big Data; Smart Manufacturing; Industrie 4.0; Industrial Internet},
   language = {German},
   cr-category = {H.4.0 Information Systems Applications General,     J.2 Physical Sciences and Engineering,     J.6 Computer-Aided Engineering},
   ee = {http://www.werkstattstechnik.de/wt/currentarticle.php?data[article_id]=87256},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die Verarbeitung gro{\ss}er Datenmengen sowie die Erkenntnis, dass Datenanalysen eine hohe Relevanz haben, sind in den produzierenden Unternehmen angekommen. Bekannte Anwendungsbeispiele sind Digital Mock-Up in der Produktentwicklung oder Prozessoptimierung durch Predictive Maintenance. Die in letzter Zeit entwickelten Referenzarchitekturen in diesen breitgef{\"a}cherten Themenfeldern betrachten dementsprechend verschiedene Aspekte in unterschiedlichen Auspr{\"a}gungen. Dieser aus zwei Teilen bestehende Beitrag rekapituliert und bewertet diese Entwicklungen, um Unternehmen bei der Umsetzung ihrer eigenen individuellen Architektur Hilfestellung zu geben. Im ersten Teil des Beitrags (Ausgabe 3-2017: wt Werkstattstechnik online) wurden aktuelle Referenzarchitekturen mit ihren Architekturbausteinen im Bereich Industrie 4.0 vorgestellt. In diesem zweiten Teil werden nun die Referenzarchitekturen unter dem Gesichtspunkt der Themenfelder Analytics sowie Datenmanagement untersucht und bewertet.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2017-07&engl=1}
}
@article {ART-2017-02,
   author = {Christian Weber and Jan K{\"o}nigsberger},
   title = {{Industrie 4.0: Aktuelle Entwicklungen f{\"u}r Analytics - Teil 1: Analytics und Datenmanagement in Industrie 4.0-Referenzarchitekturen}},
   journal = {wt Werkstattstechnik online},
   address = {D{\"u}sseldorf},
   publisher = {Springer-VDI-Verlag},
   volume = {107},
   number = {3},
   pages = {113--117},
   type = {Article in Journal},
   month = {March},
   year = {2017},
   keywords = {IT Architecture; Analytics; Edge Analytics; Big Data; Smart Manufacturing; Industrie 4.0; Industrial Internet},
   language = {German},
   cr-category = {H.4.0 Information Systems Applications General,     J.2 Physical Sciences and Engineering,     J.6 Computer-Aided Engineering},
   ee = {http://www.werkstattstechnik.de/wt/currentarticle.php?data[article_id]=87256},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die Verarbeitung gro{\ss}er Datenmengen sowie die hohe Relevanz von Datenanalysen sind in den produzierenden Unternehmen mittlerweile angekommen. Bekannte Anwendungsbeispiele sind Digital Mock-Up in der Produktentwicklung oder Prozessoptimierung durch Predictive Maintenance. Die in letzter Zeit entwickelten Referenzarchitekturen in diesen breitgef{\"a}cherten Themenfeldern betrachten dementsprechend verschiedene Aspekte in unterschiedlichen Auspr{\"a}gungen. Dieser aus zwei Teilen bestehende Fachbeitrag rekapituliert und bewertet diese Entwicklungen, um Unternehmen bei der Umsetzung ihrer eigenen individuellen Architektur Hilfestellung zu geben. Im Teil 1 werden aktuelle Referenzarchitekturen mit ihren Architekturbausteinen im Bereich Industrie 4.0 vorgestellt. Im zweiten Teil (Ausgabe 6-2017 der wt Werkstattstechnik online) werden die Referenzarchitekturen unter dem Gesichtspunkt der Themenfelder Analytics sowie Datenmanagement untersucht und bewertet.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2017-02&engl=1}
}
@article {ART-2016-23,
   author = {Pascal Hirmer and Uwe Breitenb{\"u}cher and Ana Cristina Franco da Silva and K{\'a}lm{\'a}n K{\'e}pes and Bernhard Mitschang and Matthias Wieland},
   title = {{Automating the Provisioning and Configuration of Devices in the Internet of Things}},
   journal = {Complex Systems Informatics and Modeling Quarterly},
   publisher = {Online},
   volume = {9},
   pages = {28--43},
   type = {Article in Journal},
   month = {December},
   year = {2016},
   doi = {10.7250/csimq.2016-9.02},
   issn = {2255 - 9922},
   keywords = {Internet of Things; sensors; actuators; digital twin; ontologies; TOSCA},
   language = {English},
   cr-category = {J.6 Computer-Aided Engineering,     H.3.1 Content Analysis and Indexing},
   ee = {https://csimq-journals.rtu.lv/article/view/csimq.2016-9.02/pdf_8},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The Internet of Things benefits from an increasing number of interconnected technical devices. This has led to the existence of so-called smart environments, which encompass one or more devices sensing, acting, and automatically performing different tasks to enable their self-organization. Smart environments are divided into two parts: the physical environment and its digital representation, oftentimes referred to as digital twin. However, the automated binding and monitoring of devices of smart environments are still major issues. In this article we present a method and system architecture to cope with these challenges by enabling (i) easy modeling of sensors, actuators, devices, and their attributes, (ii) dynamic device binding based on their type, (iii) the access to devices using different paradigms, and (iv) the monitoring of smart environments in regard to failures or changes. We furthermore provide a prototypical implementation of the introduced approach.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-23&engl=1}
}
@article {ART-2016-19,
   author = {Marina Bitsaki and Christos Koutras and George Koutras and Frank Leymann and Frank Steimle and Sebastian Wagner and Matthias Wieland},
   title = {{ChronicOnline: Implementing a mHealth solution for monitoring and early alerting in chronic obstructive pulmonary disease}},
   journal = {Health Informatics Journal},
   publisher = {Sage Publications},
   pages = {1--10},
   type = {Article in Journal},
   month = {April},
   year = {2016},
   doi = {10.1177/1460458216641480},
   keywords = {chronic obstructive pulmonary disease; cloud computing; health services; mobile applications; monitoring},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.8 Database Applications,     J.3 Life and Medical Sciences},
   ee = {http://jhi.sagepub.com/content/early/2016/04/16/1460458216641480.full.pdf+html},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {Lack of time or economic difficulties prevent chronic obstructive pulmonary disease patients from communicating regularly with their physicians, thus inducing exacerbation of their chronic condition and possible hospitalization. Enhancing Chronic patients{\^a}€™ Health Online proposes a new, sustainable and innovative business model that provides at low cost and at significant savings to the national health system, a preventive health service for chronic obstructive pulmonary disease patients, by combining human medical expertise with state-of-the-art online service delivery based on cloud computing, service-oriented architecture, data analytics, and mobile applications. In this article, we implement the frontend applications of the Enhancing Chronic patients{\^a}€™ Health Online system and describe their functionality and the interfaces available to the users.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-19&engl=1}
}
@article {ART-2016-18,
   author = {Frank Steimle and Matthias Wieland and Bernhard Mitschang and Sebastian Wagner and Frank Leymann},
   title = {{Extended provisioning, security and analysis techniques for the ECHO health data management system}},
   journal = {Computing},
   publisher = {Springer},
   pages = {1--19},
   type = {Article in Journal},
   month = {October},
   year = {2016},
   doi = {10.1007/s00607-016-0523-8},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,     H.2.8 Database Applications,     J.3 Life and Medical Sciences},
   ee = {http://dx.doi.org/10.1007/s00607-016-0523-8},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {eHealth gains more and more interest since a lot of end-user devices supporting health data capturing are available. The captured data has to be managed and securely stored, in order to access it from different devices and share it with other users such as physicians. The aim of the german-greek research project ECHO is to support the treatment of patients, who suffer from chronic obstructive pulmonary disease, a chronic respiratory disease. Usually the patients need to be examined by their physicians on a regular basis due to their chronic condition. Since this is very time consuming and expensive we developed an eHealth system which allows the physician to monitor patients condition remotely, e.g., via smart phones. This article is an extension of previous work, where we introduced a health data model and an associated platform-architecture for the management and analysis of the data provided by the patients. There we have also shown how the security of the data is ensured and we explained how the platform can be provided in a cloud-based environment using the OASIS standard TOSCA, which enables a self-contained management of cloud-services. In this article we provide a more detailed description about the health data analysis, provisioning and security aspects of the eHealth system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-18&engl=1}
}
@article {ART-2016-16,
   author = {Mathias Mormul and Pascal Hirmer and Matthias Wieland and Bernhard Mitschang},
   title = {{Situation model as interface between situation recognition and situation-aware applications}},
   journal = {Computer Science - Research and Development},
   publisher = {Springer Berlin Heidelberg},
   pages = {1--12},
   type = {Article in Journal},
   month = {November},
   year = {2016},
   doi = {10.1007/s00450-016-0335-2},
   keywords = {Situation; Situation-awareness; Data management; Internet of things; Context; Context-awareness},
   language = {English},
   cr-category = {J.6 Computer-Aided Engineering,     H.3.1 Content Analysis and Indexing},
   ee = {http://link.springer.com/article/10.1007/s00450-016-0335-2},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The upcoming of internet of things draws interest of many companies and leads to the creation of smart environments. The foundation necessary for this purpose lies in the integration of sensors, which continuously provide context data of their environment. Based on this context, changes of state in the environment, i.e., situations, can be detected. However, with the huge amount of heterogeneous context and its processing, new challenges arise. Simultaneously, the dynamic behavior of the environment demands automated mechanisms for applications to adapt to the situations automatically and in a timely manner. To meet this challenge, we present (1) the situation model as a data model for integrating all data related to situation recognition, and (2) the management and provisioning of situations based on this situation model to further decouple situation recognition and applications adapting to recognized situations. Furthermore, we present a prototypical implementation of the situation model and its management.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-16&engl=1}
}
@article {ART-2016-14,
   author = {Ana Cristina Franco da Silva and Pascal Hirmer and Matthias Wieland and Bernhard Mitschang},
   title = {{SitRS XT – Towards Near Real Time Situation Recognition}},
   journal = {Journal of Information and Data Management},
   publisher = {-},
   volume = {7},
   number = {1},
   pages = {4--17},
   type = {Article in Journal},
   month = {April},
   year = {2016},
   keywords = {Complex Event Processing; Internet of Things; Situation-awareness; Situation Recognition},
   language = {English},
   cr-category = {H.3 Information Storage and Retrieval,     I.5 Pattern Recognition},
   ee = {https://seer.lcc.ufmg.br/index.php/jidm/article/view/2109},
   contact = {franco-da-silva@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays, the Internet of Things gains more and more attention through cheap, highly interconnected hardware devices that are attached with sensors and actuators. This results in an instrumented environment that provides sufficient context information to drive what is called situation recognition. Situations are derived from large amounts of context data, which is difficult to handle. In this article, we present SitRS XT, an extension of our previously introduced situation recognition service SitRS, to enable situation recognition in near real time. SitRS XT provides easy to use situation recognition based on Complex Event Processing, which is highly efficient. The architecture and method of SitRS XT is described and evaluated through a prototypical implementation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-14&engl=1}
}
@article {ART-2016-13,
   author = {Pascal Hirmer and Bernhard Mitschang},
   title = {{TOSCA4Mashups: enhanced method for on-demand data mashup provisioning}},
   journal = {Computer Science - Research and Development},
   publisher = {Springer Berlin Heidelberg},
   pages = {1--10},
   type = {Article in Journal},
   month = {October},
   year = {2016},
   doi = {10.1007/s00450-016-0330-7},
   keywords = {Data Mashups; TOSCA; Provisioning; Cloud Computing},
   language = {English},
   cr-category = {E.0 Data General,     E.1 Data Structures,     H.1 Models and Principles},
   ee = {http://link.springer.com/article/10.1007/s00450-016-0330-7},
   contact = {Pascal.Hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays, the amount of data increases tremendously. Extracting information and generating knowledge from this data is a great challenge. To cope with this issue – oftentimes referred to as big data problem – we need effective means for efficient data integration, data processing, and data analysis. To enable flexible, explorative and ad-hoc data processing, several data mashup approaches and tools have been developed in the past. One of these tools is FlexMash – a data mashup tool developed at the University of Stuttgart. By offering domain-specific graphical modeling as well as a pattern-based execution, FlexMash enables usage by a wide range of users, both domain experts and technical experts. The core idea of FlexMash is a flexible execution of data mashups using different, user-requirement-dependent execution components. In this paper, we present a new approach for on-demand, automated provisioning of these components in a cloud computing environment using the Topology and Orchestration Specification for Cloud Applications. This enables many advantages for mashup execution such as scalability, availability and cost savings.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-13&engl=1}
}
@article {ART-2016-12,
   author = {Pascal Hirmer and Matthias Wieland and Holger Schwarz and Bernhard Mitschang and Uwe Breitenb{\"u}cher and Santiago G{\'o}mez S{\'a}ez and Frank Leymann},
   title = {{Situation recognition and handling based on executing situation templates and situation-aware workflows}},
   journal = {Computing},
   publisher = {Springer},
   pages = {1--19},
   type = {Article in Journal},
   month = {October},
   year = {2016},
   doi = {10.1007/s00607-016-0522-9},
   keywords = {Situation Recognition; IoT; Context; Integration; Cloud Computing; Workflows; Middleware},
   language = {English},
   cr-category = {J.6 Computer-Aided Engineering,     H.3.1 Content Analysis and Indexing},
   ee = {http://dx.doi.org/10.1007/s00607-016-0522-9},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, the Internet of Things has evolved due to an advanced interconnectivity of hardware devices equipped with sensors and actuators. Such connected environments are nowadays well-known as smart environments. Famous examples are smart homes, smart cities, and smart factories. Such environments should only be called {\ss}mart`` if they allow monitoring and self-organization. However, this is a great challenge: (1) sensors have to be bound and sensor data have to be efficiently provisioned to enable monitoring of these environments, (2) situations have to be detected based on sensor data, and (3) based on the recognized situations, a reaction has to be triggered to enable self-organization, e.g., through notification delivery or the execution of workflows. In this article, we introduce SitOPT---an approach for situation recognition based on raw sensor data and automated handling of occurring situations through notification delivery or execution of situation-aware workflows. This article is an extended version of the paper ''SitRS - Situation Recognition based on Modeling and Executing Situation Templates`` presented at the 9th Symposium and Summer School of Service-oriented Computing 2015.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-12&engl=1}
}
@article {ART-2016-10,
   author = {Christoph Hochreiner and Stefan Schulte and Oliver Kopp},
   title = {{Bericht zum 8. ZEUS Workshop}},
   journal = {Softwaretechnik-Trends},
   publisher = {Online},
   volume = {36},
   number = {2},
   pages = {61--62},
   type = {Article in Journal},
   month = {August},
   year = {2016},
   issn = {0720-8928},
   language = {German},
   cr-category = {H.4.1 Office Automation},
   ee = {http://pi.informatik.uni-siegen.de/gi/stt/36_2/03_Technische_Beitraege/ZEUS2016/bericht_zeus.pdf,     http://pi.informatik.uni-siegen.de/gi/stt/36_2/index.html},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Es wird {\"u}ber den 8. ZEUS Workshop in Wien im Speziellen und dem ZEUS Workshop als Konzept im Allgemeinen berichtet.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-10&engl=1}
}
@article {ART-2016-06,
   author = {Christoph Gr{\"o}ger and Christoph Stach and Bernhard Mitschang and Engelbert Westk{\"a}mper},
   title = {{A mobile dashboard for analytics-based information provisioning on the shop floor}},
   journal = {International Journal of Computer Integrated Manufacturing},
   publisher = {Taylor \& Francis Inc.},
   pages = {1--20},
   type = {Article in Journal},
   month = {May},
   year = {2016},
   doi = {10.1080/0951192X.2016.1187292},
   keywords = {dashboard; cockpit; process optimisation; data analytics; business intelligence; data mining},
   language = {English},
   cr-category = {H.4.0 Information Systems Applications General,     J.2 Physical Sciences and Engineering},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today's turbulent global environment requires agility and flexibility of manufacturing companies to stay competitive. Thus, employees have to monitor their performance continuously and react quickly to turbulences which demands real-time information provisioning across all hierarchy levels. However, existing manufacturing IT systems, for example, manufacturing execution systems (MES), do hardly address information needs of individual employees on the shop floor. Besides, they do not exploit advanced analytics to generate novel insights for process optimisation. To address these issues, the operational process dashboard for manufacturing (OPDM) is presented, a mobile data-mining-based dashboard for workers and supervisors on the shop floor. It enables proactive optimisation by providing analytical information anywhere and anytime in the factory. In this paper, first, user groups and conceptual dashboard services are defined. Then, IT design issues of a mobile shop floor application on top of the advanced manufacturing analytics platform are investigated in order to realise the OPDM. This comprises the evaluation of different types of mobile devices, the development of an appropriate context model and the investigation of security issues. Finally, an evaluation in an automotive industry case is presented using a prototype in order to demonstrate the benefits of the OPDM for data-driven process improvement and agility in manufacturing.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2016-06&engl=1}
}
@article {ART-2015-10,
   author = {Cornelia Kiefer and Ulrike Pado},
   title = {{Freitextaufgaben in Online-Tests – Bewertung und Bewertungsunterst{\"u}tzung}},
   journal = {HMD Praxis der Wirtschaftsinformatik},
   publisher = {Springer},
   volume = {52},
   number = {1},
   pages = {96--107},
   type = {Article in Journal},
   month = {January},
   year = {2015},
   isbn = {10.1365/s40702-014-0104-2},
   language = {German},
   cr-category = {J Computer Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Der Einsatz von eLearning-Szenarien bietet viele innovative M{\"o}glichkeiten f{\"u}r die Wissensvermittlung. Spezielle eLearning-Tools dienen dazu, Lernressourcen, interaktive Elemente sowie Interaktions- und Kommunikationsm{\"o}glichkeiten bereitzustellen und zu kombinieren. So wird selbstgesteuertes, asynchrones Lernen m{\"o}glich, methodisch erschlie{\ss}en sich neue Wege und hohe Aufw{\"a}nde f{\"u}r gro{\ss}e Lerngruppen k{\"o}nnen sinken. In diesem Zusammenhang stellt sich die Frage, welchen Nutzen die computergest{\"u}tzte Umsetzung von Lernstands{\"u}berpr{\"u}fungen (Tests und Klausuren) f{\"u}r Dozenten und Lernende haben kann. Stark assoziiert mit Tests im eLearning-Bereich sind Multiple-Choice-Aufgaben. Als automatisch korrigierbare Fragen k{\"o}nnen sie im eLearning-Umfeld schnell und objektiv bewertet werden und liefern auch bei gro{\ss}en Teilnehmerzahlen schnell Feedback an Lernende und Dozenten. Gleichzeitig zweifeln viele Dozenten daran, dass diese Frageform die geforderten Kenntnisse und F{\"a}higkeiten wirklich wiederspiegeln und bef{\"u}rchten ungerechtfertigte Erfolge durch Raten. Freitextfragen umgehen diese Probleme und bieten den Mehrwert einer klareren Einsicht in die Denkweise des Pr{\"u}flings, doch ist ihre Korrektur zeitaufw{\"a}ndig und oft subjektiv. Wir geben Hinweise f{\"u}r die Praxis, die die Bewertung von Freitextaufgaben verbessern und beschleunigen helfen, und illustrieren unsere {\"U}berlegungen an einem realen Datensatz von Freitextfragen und Antworten, der im Verlauf einer Einf{\"u}hrungsveranstaltung in die Programmierung f{\"u}r Informatiker und Wirtschaftsinformatiker gewonnen wurde. Abschlie{\ss}end stellen wir unsere noch andauernde Arbeit an einem System zur halbautomatischen Bewerterunterst{\"u}tzung vor, das vom computerbasierten Umfeld im eLearning-Bereich profitiert und sowohl den Zeitaufwand f{\"u}r die manuelle Bewertung als auch die Replizierbarkeit der Bewertungen weiter optimieren soll.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2015-10&engl=1}
}
@article {ART-2015-05,
   author = {Christoph Stach and Bernhard Mitschang},
   title = {{Der Secure Data Container (SDC)}},
   journal = {Datenbank-Spektrum},
   address = {Berlin, Heidelberg},
   publisher = {Springer Verlag},
   volume = {15},
   number = {2},
   pages = {109--118},
   type = {Article in Journal},
   month = {July},
   year = {2015},
   issn = {1618-2162},
   doi = {10.1007/s13222-015-0189-y},
   keywords = {Datenschutz; Schutzziele; PMP-Erweiterung; Datencontainer; Evaluation},
   language = {German},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     D.4.6 Operating Systems Security and Protection},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Mobile Endger{\"a}te wurden zu Marc Weisers Computer des 21. Jahrhunderts, da sie als dauerhaft verf{\"u}gbare Informationsquelle Einzug in unseren Alltag gehalten haben. Auf ihnen treffen private Daten (z.B. Fotos) auf Kontextdaten (z.B. Standortdaten); verkn{\"u}pft stellen diese ein immenses Sicherheitsrisiko dar. Wie eine Vielzahl an Datendiebst{\"a}hlen belegt, reichen die existierenden Datensicherheitssysteme f{\"u}r Mobilplattformen bei weitem nicht aus. Daher bedarf es einer Identifikation m{\"o}glicher Angriffsvektoren sowie einer Analyse der speziellen Schutzziele eines solchen Systems. Darauf basierend wird die Privacy Management Platform, ein Berechtigungssystem, mithilfe des neu eingef{\"u}hrten Secure Data Containers zu einem ganzheitlichen Datensicherheitssystem erweitert. Dabei zeigt sich, dass diese Kombination alle Schutzziele erf{\"u}llt und dennoch hochperformant ist. Obwohl die vorgestellten Prototypen auf Android basieren, ist das Konzept auch auf andere App-Plattformen anwendbar.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2015-05&engl=1}
}
@article {ART-2015-03,
   author = {Stefan Silcher and Erwin Gro{\ss} and Jan K{\"o}nigsberger and J{\"o}rg Siegert and Michael Lickefett and Thomas Bauernhansl and Bernhard Mitschang},
   title = {{Mobile Fabriklayoutplanung}},
   journal = {wt Werkstattstechnik online},
   address = {D{\"u}sseldorf},
   publisher = {Springer-VDI-Verlag},
   volume = {105},
   number = {3},
   pages = {96--101},
   type = {Article in Journal},
   month = {March},
   year = {2015},
   language = {German},
   cr-category = {J.6 Computer-Aided Engineering,     H.4.2 Information Systems Applications Types of Systems},
   ee = {http://www.werkstattstechnik.de/wt/currentarticle.php?data[article_id]=82746},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Eine stetig steigende Produktvielfalt sowie ein sich schnell {\"a}nderndes Marktumfeld erfordern neue Methoden der Planung, um auf diese Komplexit{\"a}t der M{\"a}rkte angemessen zu reagieren. Einen wichtigen Stellhebel bildet dabei die Wandlungsf{\"a}higkeit, die durch geeignete Planungsmethoden unterst{\"u}tzt und optimiert wird. Gerade in der Layoutplanung k{\"o}nnen geeignete Methoden und Systeme zu einem Wettbewerbsvorteil f{\"u}hren. Dieser Fachartikel geht am Beispiel der Lernfabrik {\^a}€žadvanced Industrial Engineering{\^a}€ś (aIE) und einer f{\"u}r das Android-Betriebssystem entwickelten App zur Layoutplanung auf die mobile Layoutplanung {\^a}€žvor Ort{\^a}€ś in der Fabrik ein.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2015-03&engl=1}
}
@article {ART-2014-08,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Christoph Fehling and Oliver Kopp and Frank Leymann and Matthias Wieland},
   title = {{Policy-Aware Provisioning and Management of Cloud Applications}},
   journal = {International Journal On Advances in Security},
   publisher = {Xpert Publishing Services},
   volume = {7},
   number = {1\&2},
   pages = {15--36},
   type = {Article in Journal},
   month = {June},
   year = {2014},
   issn = {1942-2636},
   keywords = {Cloud Computing; Application Management; Provisioning; Security; Policies},
   language = {English},
   cr-category = {D.2.7 Software Engineering Distribution, Maintenance, and Enhancement,     D.2.9 Software Engineering Management,     K.6 Management of Computing and Information Systems,     K.6.3 Software Management,     K.6.5 Security and Protection},
   ee = {http://thinkmind.org/index.php?view=article&articleid=sec_v7_n12_2014_2},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The automated provisioning and management of composite Cloud applications is a major issue and of vital importance in Cloud Computing. It is key to enable properties such as elasticity and pay-per-use. The functional aspects of provisioning and management such as instantiating virtual machines or updating software components are covered by various technologies on different technical levels. However, currently available solutions are tightly coupled to individual technologies without being able to consider non-functional security requirements in a non-proprietary and interoperable way. In addition, due to their heterogeneity, the integration of these technologies in order to benefit from their individual strengths is a major problem - especially if non-functional aspects have to be considered and integrated, too. In this article, we present a concept that enables executing management tasks using different heterogeneous management technologies in compliance with non-functional security requirements specified by policies. We extend the Management Planlet Framework by a prototypical implementation of the concept and evaluate the approach by several case studies.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2014-08&engl=1}
}
@article {ART-2014-06,
   author = {Tobias Binz and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann},
   title = {{Migration of enterprise applications to the cloud}},
   journal = {it - Information Technology, Special Issue: Architecture of Web Application},
   publisher = {De Gruyter},
   volume = {56},
   number = {3},
   pages = {106--111},
   type = {Article in Journal},
   month = {May},
   year = {2014},
   doi = {10.1515/itit-2013-1032},
   issn = {1611-2776},
   keywords = {Migration; Cloud},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems,     D.2.7 Software Engineering Distribution, Maintenance, and Enhancement},
   contact = {a href=``http://www.iaas.uni-stuttgart.de/institut/mitarbeiter/binz''Tobias Binz/ a},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The migration of existing applications to the cloud enables enterprises to preserve their previous investments and - at the same time - to benefit from the properties of the cloud. This article presents a semi-automated approach for migrating existing enterprise applications to the cloud. Thereby, information about the application is gathered in the source environment, the application is extracted, transformed, and cloud-enabled. This makes the application ready for provisioning in the target cloud. Cloud-enabling an application preserves its business functionality and does not},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2014-06&engl=1}
}
@article {ART-2014-04,
   author = {Cataldo Mega and Tim Waizenegger and David Lebutsch and Stefan Schleipen and J.M. Barney},
   title = {{Dynamic cloud service topology adaption for minimizing resources while meeting performance goals}},
   journal = {IBM Journal of Research and Development},
   publisher = {IBM},
   volume = {58},
   number = {2},
   pages = {1--10},
   type = {Article in Journal},
   month = {March},
   year = {2014},
   doi = {10.1147/JRD.2014.2304771},
   issn = {0018-8646},
   keywords = {Cloud computing; Electronic countermeasures; Network topology; Optimization; Resource management; Service agreements; Time measurement},
   language = {English},
   cr-category = {H.2 Database Management,     H.3 Information Storage and Retrieval,     D.4.8 Operating Systems Performance},
   contact = {tim.waizenegger@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Even in the cloud computing era, meeting service-level agreements (SLAs) of a computing service or application while significantly reducing the total cost of ownership (TCO) remains a challenge. Cloud and software defined environments (SDEs) are offering new opportunities for how resources can be utilized to an even higher degree than before{\^a}€”which leads to a reduced TCO for service providers and customers of a service. The traditional method of meeting an SLA is to assess peak workloads and size a system accordingly. This still leads to very low average compute resource utilization rates. This paper presents a novel dynamic and cost-efficient orchestration approach of multi-tenant capable, software defined system topologies based on a monitor-analyze-plan-execute (MAPE) concept. We present the mechanism involved in creating and applying these heuristics and show the results for a cloud-based enterprise content management (ECM) solution. Our approach allows the cloud provider to minimize its resource requirements while staying in compliance with SLAs.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2014-04&engl=1}
}
@article {ART-2013-09,
   author = {Sylvia Radesch{\"u}tz and Holger Schwarz and Florian Niedermann},
   title = {{Business impact analysis — a framework for a comprehensive analysis and optimization of business processes}},
   journal = {Computer Science – Research and Development},
   publisher = {Springer},
   pages = {1--18},
   type = {Article in Journal},
   month = {September},
   year = {2013},
   language = {English},
   cr-category = {H.2 Database Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The ability to continuously adapt its business processes is a crucial ability for any company in order to survive in todays dynamic world. In order to accomplish this task, a company needs to profoundly analyze all its business data. This generates the need for data integration and analysis techniques that allow for a comprehensive analysis. A particular challenge when conducting this analysis is the integration of process data generated by workflow engines and operational data that is produced by business applications and stored in data warehouses. Typically, these two types of data are not matched as their acquisition and analysis follows different principles, i.e., a process-oriented view versus a view focusing on business objects. To address this challenge, we introduce a framework that allows to improve business processes considering an integrated view on process data and operational data.We present and evaluate various architectural options for the data warehouse that provides this integrated view based on a specialized federation layer. This integrated view is also reflected in a set of operators that we introduce.We show how these operators ease the definition of analysis queries and how they allow to extract hidden optimization patterns by using data mining techniques.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2013-09&engl=1}
}
@article {ART-2012-24,
   author = {Christoph Stach},
   title = {{Gamework – A Framework Approach for Customizable Pervasive Applications}},
   journal = {International Journal of Computer Information Systems and Industrial Management Applications},
   publisher = {MIR Labs},
   volume = {4},
   pages = {66--75},
   type = {Article in Journal},
   month = {July},
   year = {2012},
   issn = {2150-7988},
   keywords = {Mobile Services; Pervasive Multi-player Games; Customizable Framework; Data Analysis and Improvement.},
   language = {English},
   cr-category = {D.3.3 Programming Language Constructs and Features,     D.2.13 Software Engineering Reusable Software,     K.8 Personal Computing},
   contact = {Senden Sie eine E-Mail an christoph.stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The number of pervasive games is growing. In a pervasive game players have to interact with their environment in order to control their avatar. While in the past such a game required immense hardware equipment, nowadays, Smartphones have all required functionality built-in already. In addition, there is an upcoming trend towards software, supported with new content and knowledge by an active community. By combining these two trends, a new genre for computer games arises, targeting not only established gamers but also a new audience. In this paper we present a framework for pervasive games that support various customization techniques. Therefore, we divided the techniques into four classes depending on the player’s technical knowledge and scale of adaption potential. Further, we present two customizable pervasive games we have implemented using the framework. Concluding, we show the potential of these games as well as the potential of our framework. We also report on early experiences in exploiting the customization approach of our framework.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2012-24&engl=1}
}
@article {ART-2012-19,
   author = {Jorge Minguez and David Baureis and Donald Neumann},
   title = {{A reference architecture for agile product-service systems}},
   journal = {CIRP Journal of Manufacturing Science and Technology},
   publisher = {Elsevier},
   volume = {5},
   number = {4},
   pages = {319--327},
   type = {Article in Journal},
   month = {January},
   year = {2012},
   issn = {1755-5817},
   doi = {10.1016/j.cirpj.2012.09.007},
   keywords = {Service, Integration, Service-oriented architecture (SOA), Product-service system (PSS), Industrial product-service systems (IPS$<$sup$>$2$<$/sup$>$), Agility},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In times of globalization and saturated markets, manufacturing companies are forced to find new possibilities of differentiation against competitors. Product-service systems (PSS) are a strategic approach that offers this possibility by integrating goods and services. The implementation of a PSS entails challenges for the resulting supply chain structure and the IT infrastructure supporting coordinated service offerings, such as conflicting goals and coordination in the integrated business processes. The service-oriented architecture (SOA) paradigm, based on loosely coupled components, provides rapid reconfiguration of business processes, rapid integration of services and goal definition through service level agreements. This paper presents a reference architecture based on SOA to support coordination and definition of goals in heterogeneous supply chains.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2012-19&engl=1}
}
@article {ART-2012-12,
   author = {Nazario Cipriani and Oliver D{\"o}rler and Bernhard Mitschang},
   title = {{Sicherer Zugriff und sichere Verarbeitung von Kontextdatenstr{\"o}men in einer verteilten Umgebung}},
   journal = {Datenbank-Spektrum ``Data Streams and Event Processing''},
   publisher = {dpunkt.verlag},
   volume = {12},
   number = {1},
   pages = {13--22},
   type = {Article in Journal},
   month = {March},
   year = {2012},
   language = {German},
   cr-category = {K.6.5 Security and Protection,     D.4.6 Operating Systems Security and Protection},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Technologischer Fortschritt im Bereich der Mikroelektronik und Kommunikationstechnik f{\"u}hren zunehmend zu einem stark vernetzten, mit Sensoren ausgestatteten Umfeld. Die damit einhergehende stetig steigende Anzahl an Sensorinformationen, deren Daten in Form von Datenstr{\"o}men bereitgestellt werden, erm{\"o}glichen neue Anwendungsszenarien und treiben neue Verarbeitungstechniken. Im Kontext der sichverst{\"a}rkenden Durchdringung des allt{\"a}glichen Lebens mit sozialen Medien und der gleichzeitigen Auswertung von beispielsweise Positionsinformationen, w{\"a}chst die Bedeutung der Zugriffskontrolle auf Information. Die Herausforderung in diesem Zusammenhang besteht darin, Mechanismen zur Verf{\"u}gung zu stellen, die eine Regelung des Datenzugriffs erm{\"o}glichen und die Datenstromverarbeitung effizient und flexibel unterst{\"u}tzen. Diese Arbeit stellt ein flexibles Rahmenwerk zur sicheren Verarbeitung von Kontextdaten vor, das es Anbietern von Daten in Datenstromverarbeitungssystemen erm{\"o}glicht, den Zugriff und die Verarbeitung sch{\"u}tzenswerter Daten zu kontrollieren. Hierbei erm{\"o}glicht das vorgestellte Konzept im Gegensatz zu bisherigen Konzepten insbesondere den feingranularen Zugriff auf Kontextdaten.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2012-12&engl=1}
}
@article {ART-2011-19,
   author = {Bernhard Mitschang and Holger Schwarz},
   title = {{Der Lehrstuhl ”Datenbanken und Informationssysteme” an der Universit{\"a}t Stuttgart stellt sich vor}},
   journal = {Datenbank-Spektrum},
   publisher = {Springer},
   volume = {11},
   number = {3},
   pages = {213--217},
   type = {Article in Journal},
   month = {November},
   year = {2011},
   language = {German},
   cr-category = {H.2 Database Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In diesem Beitrag stellen wir den Lehrstuhl f{\"u}r Datenbanken und Informationssysteme der Universit{\"a}t Stuttgart unter der Leitung von Prof. Dr. Bernhard Mitschang vor. Nach einem {\"U}berblick {\"u}ber die Forschungsschwerpunkte des Lehrstuhls gehen wir auf ausgew{\"a}hlte aktuelle Forschungsprojekte ein und erl{\"a}utern die Beteiligung an der Lehre in Bachelor- und Masterstudieng{\"a}ngen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-19&engl=1}
}
@article {ART-2011-14,
   author = {Peter Reimann and Holger Schwarz and Bernhard Mitschang},
   title = {{Design, Implementation, and Evaluation of a Tight Integration of Database and Workflow Engines}},
   journal = {Journal of Information and Data Management},
   editor = {Alberto H. F. Laender and Mirella M. Moro},
   publisher = {SBC - Brazilian Computer Society},
   volume = {2},
   number = {3},
   pages = {353--368},
   type = {Article in Journal},
   month = {October},
   year = {2011},
   issn = {2178-7107},
   keywords = {Data-Intensive Workflow; Improved Local Data Processing; Scientific Workflow; Simulation Workflow},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     H.2.8 Database Applications,     H.4.1 Office Automation},
   contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Accessing and processing huge amounts of heterogeneous and distributed data are some of the major challenges of data-intensive workflows. Traditionally, the descriptions of such workflows focus on their data flow. Nevertheless, control-flow-oriented workflow languages are increasingly adapted to the needs of data-intensive workflows. This provides a common level of abstraction for both data-intensive workflows and classical orchestration workflows, e.g., business workflows, which then enables a comprehensive optimization across all workflows. However, the problem still remains that workflows described in control-flow-oriented languages tend to be less efficient for data-intensive processes compared to specialized data-flow-oriented approaches. In this paper, we propose a new kind of optimization targeted at data-intensive workflows that are described in control-flow-oriented languages. We show how to improve efficiency of such workflows by introducing various techniques that partition the local data processing tasks to be performed during workflow execution in an improved way. These data processing tasks are either assigned to the workflow engine or to the tightly integrated local database engine. We evaluate the effectiveness of these techniques by means of various test scenarios.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-14&engl=1}
}
@article {ART-2011-12,
   author = {Jorge Minguez and Stefan Silcher and Philipp Riffelmacher and Bernhard Mitschang},
   title = {{A Service Bus Architecture for Application Integration in the Planning and Production Phases of a Product Lifecycle}},
   journal = {International Journal of Systems and Service-Oriented Engineering},
   publisher = {IGI Global},
   volume = {2},
   number = {2},
   pages = {21--36},
   type = {Article in Journal},
   month = {June},
   year = {2011},
   issn = {1947-3052},
   keywords = {Manufacturing Service Bus; Service-oriented Architecture; Product Lifecycle Management; SOA; MSB; PLM},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Constantly changing business conditions require a high level of flexibility in business processes as well as an adaptive and fully interoperable IT infrastructure in today’s manufacturing environments. The lack of flexibility prevents manufacturing companies from improving their responsiveness and adapting their workflows to turbulent scenarios. In order to achieve highly flexible and adaptive workflows, information systems in digital factories and shop floors need to be integrated. The most challenging problem in such manufacturing environments is the high heterogeneity of the IT landscape, where the integration of legacy systems and information silos has led to chaotic architectures over the last two decades. In order to overcome this issue, the authors present a flexible integration platform that allows a loose coupling of distributed services in event-driven manufacturing environments. The proposed approach enables a flexible communication between digital factory and shop floor components by introducing a service bus architecture. This solution integrates an application-independent canonical message format for manufacturing events, content-based routing and transformation services as well as event processing workflows.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-12&engl=1}
}
@article {ART-2011-07,
   author = {Holger Schwarz},
   title = {{Generierung des Datenzugriffs in Anwendungsprogrammen: Anwendungsbereiche und Implementierungstechniken}},
   journal = {Datenbank Spektrum},
   address = {Heidelberg},
   publisher = {Springer},
   volume = {11},
   number = {1},
   pages = {5--14},
   type = {Article in Journal},
   month = {April},
   year = {2011},
   language = {German},
   cr-category = {H.4 Information Systems Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Datenzugriffe auf externe und heterogene Datenbest{\"a}nde sind ein grundlegender Bestandteil von Anwendungsprogrammen in ganz unterschiedlichen Anwendungsbereichen. Vielfach k{\"o}nnen diese Datenzugriffe nicht {\"u}ber statisch eingebettete Anweisungen realisiert werden, sondern m{\"u}ssen dynamisch generiert werden. In diesem Beitrag wird das Spektrum relevanter Anwendungsbereiche vorgestellt. Ausgehend von einzelnen Systembeispielen werden wichtige Aspekte anfragegenerierender Systeme verallgemeinert. Hierzu wird eine Systemklassifikation vorgestellt und die Bedeutung der Klassifikation insbesondere f{\"u}r Optimierungsaspekte erl{\"a}utert. Ferner werden drei grundlegende Implementierungskonzepte f{\"u}r anfragegenerierende Systeme vorgestellt und deren Eignung f{\"u}r einzelne Anwendungsklassen diskutiert.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-07&engl=1}
}
@article {ART-2011-04,
   author = {Jorge Minguez and Philipp Riffelmacher and Bernhard Mitschang and Engelbert Westk{\"a}mper},
   title = {{Servicebasierte Integration von Produktionsanwendungen}},
   journal = {Werkstattstechnik online},
   publisher = {Springer-VDI Verlag},
   volume = {3-2011},
   pages = {128--133},
   type = {Article in Journal},
   month = {March},
   year = {2011},
   keywords = {service-oriented architecture; SOA; ESB; manufacturing; produktion; lernfabrik; produktionsanwendungen; servicebasierte integration},
   language = {German},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   ee = {http://www.technikwissen.de/wt/currentarticle.php?data[article_id]=59574},
   contact = {jorge.minguez@gsame.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In einem modernen Produktionsumfeld soll es m{\"o}glich sein, informationstechnische Prozesse an die sich zunehmend {\"a}ndernden Gesch{\"a}ftsbedingungen anzupassen. Um eine schnelle Anpassung zu realisieren, ist eine flexible Integration unterschiedlicher Informationssysteme erforderlich, da die Informationsfl{\"u}sse durch system{\"u}bergreifende Datenbearbeitungsprozesse gesteuert werden. Die heterogene Landschaft der digitalen Werkzeuge stellt dabei eine enorme Herausforderung dar. Der vorgestellte servicebasierte Ansatz adressiert diese Problematik.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-04&engl=1}
}
@article {ART-2011-03,
   author = {Nazario Cipriani and Matthias Wieland and Matthias Grossmann and Daniela Nicklas},
   title = {{Tool support for the design and management of context models}},
   journal = {Information Systems},
   editor = {Gottfried Vossen and Tadeusz Morzy},
   address = {Oxford, UK, UK},
   publisher = {Elsevier Science Ltd.},
   volume = {36},
   number = {1},
   pages = {99--114},
   type = {Article in Journal},
   month = {March},
   year = {2011},
   isbn = {0306-4379},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   ee = {http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235646%232011%23999639998%232475749%23FLA%23&_cdi=5646&_pubType=J&_auth=y&_acct=C000022964&_version=1&_urlVersion=0&_userid=479010&md5=90fcaef40ac5285da3d69e894c214388,     http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V0G-50GMMMG-4-1K&_cdi=5646&_user=479010&_pii=S0306437910000669&_origin=browse&_zone=rslt_list_item&_coverDate=03%2F31%2F2011&_sk=999639998&wchp=dGLbVtb-zSkzk&md5=aac6f0561c2464d528bcce117970acff&ie=/sdarticle.pdf},
   department = {University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {A central task in the development of context-aware applications is the modeling and management of complex context information. In this paper, we present the NexusEditor, which can ease this task by providing a graphical user interface to design schemas for spatial and technical context models, interactively create queries, send them to a server and visualize the results. One main contribution is to show how schema awareness can improve such a tool: The NexusEditor dynamically parses the underlying data model and provides additional syntactic checks, semantic checks, and short-cuts based on the schema information. Furthermore, the tool helps to design new schema definitions based on the existing ones, which is crucial for an iterative and user-centric development of context-aware applications. Finally, it provides interfaces to existing information spaces and visualization tools for spatial data like GoogleEarth.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-03&engl=1}
}
@article {ART-2009-30,
   author = {Nicola H{\"o}nle and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
   title = {{Design and implementation of a domain-aware data model for pervasive context information}},
   journal = {Computer Science Research + Development},
   publisher = {Springer},
   volume = {24},
   number = {1-2},
   pages = {69--83},
   type = {Article in Journal},
   month = {September},
   year = {2009},
   language = {English},
   cr-category = {H.2.1 Database Management Logical Design,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {We introduce a data model for a context-management middleware that enables context-aware and pervasive computing applications to transparently access available data providers and that effectively combines their data. Our approach supports new data fusion concepts for overlapping and heterogeneous data sets and thus maximizes the information presented to the application. The main part of our data model is a flexible concept for meta data that is able to represent important aspects like quality, data derivation, or temporal characteristics of data. Attributes having multiple values are utilized to represent sensor measurements histories like locations of mobile objects at different points in time. In our paper, we characterize the requirements for our data model and show that existing data models, including the (object-) relational data model and standard XML data models, do not offer the required flexibility. Therefore basic XML technology is extended to support the necessary meta data concept and multiply typed objects.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2009-30&engl=1}
}
@article {ART-2009-09,
   author = {Jing Lu and Bernhard Mitschang},
   title = {{Enforcing Data Consistency in Data Integration Systems by XQuery Trigger Service}},
   journal = {International Journal of Web Information Systems},
   publisher = {Emerald Group Publishing Limited},
   volume = {5},
   number = {2},
   pages = {1--19},
   type = {Article in Journal},
   month = {May},
   year = {2009},
   language = {English},
   cr-category = {E.0 Data General},
   contact = {jinglu76@gmail.com},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Nowadays XML-based data integration systems are accepted as data service providers on the web. In order to make such a data integration system fully equipped with data manipulation capabilities, programming frameworks which support update at the integration level are being developed. When the user is permitted to submit updates, it is necessary to establish the best possible data consistency for the whole data integration system. To that extend, we present an approach based on an XQuery trigger service. We define an XQuery trigger model together with its semantics. We report on the integration of the XQuery trigger service into the overall architecture and discuss details of the execution model. Experiments show that our approach provides an easy, efficient and convenient way to achieve data consistency at the global level.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2009-09&engl=1}
}
@article {ART-2009-08,
   author = {Nazario Cipriani and Daniela Nicklas and Matthias Gro{\ss}mann and Nicola H{\"o}nle and Carlos L{\"u}bbe and Bernhard Mitschang},
   title = {{Verteilte Datenstromverarbeitung von Sensordaten}},
   journal = {Datenbank-Spektrum},
   publisher = {dpunkt Verlag},
   volume = {9},
   number = {28},
   pages = {37--43},
   type = {Article in Journal},
   month = {February},
   year = {2009},
   language = {German},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications,     E.4 Data Coding and Information Theory},
   contact = {nazario.cipriani@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Technologischer Fortschritt im Bereich der Mikroelektronik und Kommunikationstechnik f{\"u}hren zunehmend zu einem stark vernetzten, mit Sensoren ausgestatteten Umfeld. Die Herausforderung, die in diesem Zusammenhang auftretenden kontinuierlichen Datenstr{\"o}me zu verwalten und effizient zu verarbeiten, sowie heterogene Sensorger{\"a}te und Netztopologien zu integrieren, ist f{\"u}r viele Anwendungsentwickler eine zu gro{\ss}e H{\"u}rde. In dieser Arbeit wird eine Middleware vorgestellt, die es einer Anwendung erm{\"o}glicht, anfragebasiert die Verarbeitung von kontinuierlichen Datenstr{\"o}men zu steuern. Die zur Verarbeitung der Daten ben{\"o}tigten Operatoren werden virtualisiert ausgef{\"u}hrt, um die gr{\"o}{\ss}tm{\"o}gliche Flexibilit{\"a}t bei der Verteilung auf die beteiligten physischen Knoten zu erreichen. Weiterhin werden Ans{\"a}tze zur Komprimierung von Datenstr{\"o}men vorgestellt, um das Gesamtvolumen der ausgetauschten Daten zwischen den Knoten zu reduzieren.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2009-08&engl=1}
}
@article {ART-2009-03,
   author = {Daniela Nicklas and Matthias Grossmann and Matthias Wieland},
   title = {{Context Modeling for Mobile, Adaptive Applications}},
   journal = {it - Information Technology},
   publisher = {Oldenbourg Wissenschaftsverlag GmbH},
   volume = {51},
   number = {2},
   pages = {85--92},
   type = {Article in Journal},
   month = {March},
   year = {2009},
   doi = {10.1524/itit.2009.0527},
   keywords = {ubiquitous Computing; pervasive Computing; context modeling; mobile applications; Content Analysis and indexing},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications,     H.3 Information Storage and Retrieval},
   ee = {http://www.atypon-link.com/OLD/toc/itit/51/2,     http://www.atypon-link.com/OLD/doi/pdf/10.1524/itit.2009.0527},
   department = {University of Stuttgart, Institute of Architecture of Application Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Abstract Context-aware applications adapt their behavior according to the current situation. In this paper we present a layered model to separate different tasks and concerns in designing data models for context-aware applications. The layers are discussed along the Nexus approach, which is designed to support large-scale, mobile applications by federated context models. Furthermore, related approaches are described and compared. Zusammenfassung Kontextbezogene Anwendungen adaptieren ihr Verhalten aufgrund von Situationen. Dieser Beitrag pr{\"a}sentiert ein Ebenenmodell f{\"u}r Datenmodelle solcher Anwendungen, das verschiedene Probleme und Aufgaben im Entwurf der Daten, der Adaptionslogik und der Verarbeitung kapselt. Die Ebenen werden anhand des Nexus-Ansatzes diskutiert, dessen Ziel es ist, mobile, kontext-bezogene Anwendungen durch f{\"o}derierte Kontextmodelle zu unterst{\"u}tzen, und mit verwandten Arbeiten verglichen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2009-03&engl=1}
}
@article {ART-2008-16,
   author = {Stefanie Springer and Severin Beucker and Daniel Heubach and Fabian Kaiser and Dierk-Oliver Kiehne and Mih{\'a}ly Jakob},
   title = {{Mit Softwaretools zu nachhaltigen Produkt- und Serviceinnovationen}},
   journal = {{\"O}kologisches Wirtschaften},
   address = {M{\"u}nchen},
   publisher = {oekom verlag},
   pages = {43--46},
   type = {Article in Journal},
   month = {August},
   year = {2008},
   issn = {1430-8800},
   language = {German},
   cr-category = {H.3.3 Information Search and Retrieval,     D.2.3 Software Engineering Coding Tools and Techniques},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Wie k{\"o}nnen Unternehmen durch Produktinnovationen einen Beitrag dazu leisten, dass das Leitbild einer nachhaltigen Entwicklung umgesetzt wird, und welche Potenziale bietet dabei der Einsatz des Internet? Das waren die zentralen Fragen, die in dem von 2003 bis 2007 vom BMBF gef{\"o}rderten Projekt nova-net gestellt wurden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2008-16&engl=1}
}
@article {ART-2008-06,
   author = {Daniel Heubach and Severin Beucker and Fabian Kaiser and Mih{\'a}ly Jakob and Dierk-Oliver Kiehne},
   title = {{Fr{\"u}he Innovationsphasen - Informationsgewinnung durch delphigest{\"u}tztes Szenariomanagement und Expertensuche}},
   journal = {ZWF Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb},
   publisher = {Hanser-Verlag},
   pages = {260--264},
   type = {Article in Journal},
   month = {April},
   year = {2008},
   issn = {0947-0085},
   keywords = {fr{\"u}he Innovationsphasen; delphigest{\"u}tztes Szenario-Management; Expertensuche; semanti-sche Modelle; Internet; Technologiemanagement},
   language = {German},
   cr-category = {H.3 Information Storage and Retrieval,     H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Fr{\"u}he Innovationsphasen stellen f{\"u}r Unternehmen eine besondere Herausforderung dar, da in ihnen Orientierungswissen geschaffen und strukturiert werden muss, das bei einer Entscheidungsfindung {\"u}ber den Einstieg in ein Technologie- oder Marktfeld oder auch ein bestimmtes Produktsegment unterst{\"u}tzt. Daf{\"u}r k{\"o}nnen verschiedene Informationsquellen wie z.B. das Internet und externe Experten genutzt werden. Hier setzt das Forschungsprojekt nova-net an. Es stellt die zwei Methoden des delphigest{\"u}tzten Szenario-Management und der Expertensuche mit den dazugeh{\"o}rigen Softwaretools SEMAFOR und EXPOSE zur Verf{\"u}gung, die den Arbeitsaufwand der Informationsbeschaffung und Strukturierung deutlich reduzieren und die in ihrer Kombination eine gute Unterst{\"u}tzung bei der Entscheidungsfindung in fr{\"u}hen Innovationsphasen liefern.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2008-06&engl=1}
}
@article {ART-2007-09,
   author = {Christoph Mangold},
   title = {{A survey and classification of semantic search approaches}},
   journal = {International Journal of Metadata, Semantics and Ontologies},
   publisher = {Inderscience},
   volume = {2},
   number = {1},
   pages = {23--34},
   type = {Article in Journal},
   month = {December},
   year = {2007},
   doi = {10.1504/IJMSO.2007.015073},
   language = {English},
   cr-category = {H.3.3 Information Search and Retrieval,     I.2.4 Knowledge Representation Formalisms and Methods},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-2007-09/ART-2007-09.pdf,     http://www.inderscience.com/browse/index.php?journalID=152&year=2007&vol=2&issue=1},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {A broad range of approaches to semantic document retrieval has been developed in the context of the Semantic Web. This survey builds bridges among them. We introduce a classification scheme for semantic search engines and clarify terminology. We present an overview of ten selected approaches and compare them by means of our classification criteria. Based on this comparison, we identify not only common concepts and outstanding features, but also open issues. Finally, we give directions for future application development and research.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2007-09&engl=1}
}
@article {ART-2007-08,
   author = {Fabian Kaiser and Mih{\'a}ly Jakob and Sebastian Wiedersheim and Holger Schwarz},
   title = {{Framework-Unterst{\"u}tzung f{\"u}r aufwendige Websuche}},
   journal = {Datenbank-Spektrum},
   publisher = {dpunkt-Verlag},
   volume = {7},
   number = {23},
   pages = {13--20},
   type = {Article in Journal},
   month = {November},
   year = {2007},
   language = {German},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Die Nutzung des WWW als wichtige Informationsquelle ist heute fester Bestandteil der t{\"a}glichen Arbeit. Komplexe Suchaufgaben resultieren hierbei h{\"a}ufig in nicht trivialen, lang andauernden Suchprozessen, in deren Rahmen gro{\ss}e Datenmengen verwaltet und analysiert werden m{\"u}ssen. Ein Beispiel hierf{\"u}r ist die Suche nach Experten zu einem gegebenen Themenkomplex. Dieser Beitrag stellt das Softwareframework Supernova vor, das derartige Suchprozesse unterst{\"u}tzt. Die flexible und erweiterbare Suchplattform erlaubt es, einen Focused Crawler mit Standardsuchmaschinen zu kombinieren, stellt diverse Analysekomponenten sowie die Infrastruktur f{\"u}r deren Daten- und Informationsaustausch bereit und bildet somit die Basis f{\"u}r eine effiziente Websuche bei komplexen Fragestellungen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2007-08&engl=1}
}
@article {ART-2006-20,
   author = {Christian Becker and Frank D{\"u}rr and Mirko Knoll and Daniela Nicklas and Torben Weis},
   title = {{Entwicklung ortsbezogener Anwendungen}},
   journal = {Praxis der Informationsverarbeitung und Kommunikation (PIK)},
   editor = {Hans G. Kruse},
   publisher = {K. G. Saur Verlag},
   volume = {29},
   number = {1},
   pages = {30--36},
   type = {Article in Journal},
   month = {January},
   year = {2006},
   doi = {10.1515/PIKO.2006.30},
   keywords = {ortsbezogene Dienste; Anwendungsentwicklung},
   language = {German},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques},
   contact = {Torben Weis torben.weis@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Ortsbezogene Anwendungen versorgen Benutzer mit Diensten und Informationen in Abh{\"a}ngigkeit ihrer aktuellen Position. Beispiele sind im Bereich der Telematikdienste, Touristenf{\"u}hrer und Informationsdienste zu finden. Anwendungen k{\"o}nnen sich an den Ort oder ganz allgemein an den Kontext des Benutzers anpassen, indem sie ortsspezifische Informationen anzeigen oder Daten der jeweiligen Situation entsprechend pr{\"a}sentieren. Es existieren verschieden Ans{\"a}tze und Architekturen, um ortsbezogene Anwendungen zu realisieren. In diesem Beitrag stellen wir unterschiedliche Ans{\"a}tze vor, diskutieren deren Vor- und Nachteile und leiten daraus ein abstraktes Anwendungsmodell f{\"u}r ortsbezogene Anwendungen ab. Des Weiteren stellen wir Entwicklungswerkzeuge vor, die wir auf Basis dieses Anwendungsmodells konzipiert haben. Die Kombination aus Anwendungsmodell und spezialisierten Werkzeugen wird die Entwicklung ortsbezogener Anwendungen systematisieren und wesentlich vereinfachen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2006-20&engl=1}
}
@article {ART-2006-13,
   author = {Kurt Rothermel and Thomas Ertl and Fritsch Dieter and Paul J. K{\"u}hn and Bernhard Mitschang and Engelbert Westk{\"a}mper and Christian Becker and Dominique Dudkowski and Andreas Gutscher and Christian Hauser and Lamine Jendoubi and Daniela Nicklas and Steffen Volz and Matthias Wieland},
   title = {{SFB 627 – Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme}},
   journal = {Informatik - Forschung und Entwicklung},
   publisher = {Springer-Verlag},
   volume = {21},
   number = {1-2},
   pages = {105--113},
   type = {Article in Journal},
   month = {June},
   year = {2006},
   language = {German},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems,     H.2.8 Database Applications,     H.3 Information Storage and Retrieval},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-2006-13/ART-2006-13.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Industrielle Fertigung und Fabrikbetrieb (IFF);     University of Stuttgart, Institute of Visualisation and Interactive Systems, Visualisation and Interactive Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp);     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Kommunikationsnetze und Rechnersysteme (IKR)},
   abstract = {Computersysteme, wie wir sie heute kennen, passen sich typischerweise nicht an den Benutzer und dessen Situation an. Erste Beispiele von Systemen, die durch den Bezug zur Realwelt den Kontext des Benutzers einbeziehen, sind Navigationssysteme, die unter Ber{\"u}cksichtigung der Position eines Benutzers und der Verkehrslage Richtungsanweisungen geben k{\"o}nnen. Damit innovative kontextbezogene Anwendungen m{\"o}glich werden, muss der Kontext, also der Zustand der Realwelt, durch Sensoren erfasst, in das Computersystem {\"u}bermittelt und dort in Form dynamischer Umgebungsmodelle den Anwendungen zur Verf{\"u}gung gestellt werden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2006-13&engl=1}
}
@article {ART-2006-10,
   author = {Mih{\'a}ly Jakob and Fabian Kaiser and Holger Schwarz and Severin Beucker},
   title = {{Generierung von Webanwendungen f{\"u}r das Innovationsmanagement}},
   journal = {it - Information Technology},
   publisher = {Oldenbourg},
   volume = {48},
   number = {4},
   pages = {225--232},
   type = {Article in Journal},
   month = {August},
   year = {2006},
   language = {German},
   cr-category = {K.6.3 Software Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Der folgende Beitrag gibt einen {\"U}berblick {\"u}ber das vom Bundesministerium f{\"u}r Bildung und Forschung (BMBF) im Schwerpunktprogramm Internet{\"o}konomie gef{\"o}rderte Forschungsprojekt nova-net: Innovation in der Internet{\"o}konomie. Neben dem Forschungsrahmen und den Forschungsfeldern zur Unterst{\"u}tzung nachhaltiger Innovationsprozesse, wird insbesondere auf die Methodenentwicklung und deren informationstechnische Umsetzung im Themenfeld Trendmonitoring im Szenariomanagement eingegangen. Im Mittelpunkt steht hierbei die Erl{\"a}uterung des Szenario-Management-Frameworks SEMAFOR im Zusammenhang mit einer neu entwickelten Methode zur Entwicklung von Szenarien, sowie deren Umsetzung mittels des Webanwendungsgenerators WAGen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2006-10&engl=1}
}
@article {ART-2005-01,
   author = {Stefan Berger and Christoph Mangold and Sebastian Meyer},
   title = {{Ontologiebasiertes Wissensmanagement in der Montage - Wissen in turbulenten Zeiten strukturiert einsetzen}},
   journal = {Industrie Management},
   address = {Berlin},
   publisher = {Gito Verlag},
   volume = {21},
   number = {1},
   pages = {49--52},
   type = {Article in Journal},
   month = {February},
   year = {2005},
   language = {German},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Produzierende Unternehmen sind in turbulenten Aufgabenumfeldern mit permanenten, nicht vorhersehbaren Ver{\"a}nderungen konfrontiert, zu deren Bew{\"a}ltigung ihnen nur wenig Zeit zur Verf{\"u}gung steht. Bereits heute pr{\"a}gen Umr{\"u}st- und Einstellvorg{\"a}nge den Arbeitsalltag in der Montage. In diesem Umfeld kommt dem Menschen als Probleml{\"o}ser und damit der Ressource Wissen und deren Management eine immer bedeutendere Funktion zu. Der folgende Beitrag zeigt Ansatzpunkte f{\"u}r ein Wissensmanagement-System f{\"u}r die Montage.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2005-01&engl=1}
}
@article {ART-2004-20,
   author = {Bernhard Mitschang and Stefan Jablonski},
   title = {{Middleware-Technologien zur Systemintegration}},
   journal = {Middleware-Technologien zur Systemintegration},
   editor = {Oldenbourg},
   publisher = {Oldenbourg Wissenschaftsverlag},
   volume = {46},
   number = {4},
   pages = {173--174},
   type = {Article in Journal},
   month = {April},
   year = {2004},
   issn = {1611-2776},
   language = {English},
   cr-category = {H.2.2 Database Management Physical Design},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Middleware-Technologien zur Systemintegration},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2004-20&engl=1}
}
@article {ART-2004-14,
   author = {Bernhard Mitschang and Engelbert Westk{\"a}mper and Carmen Constantinescu and Uwe Heinkel and Benno L{\"o}ffler and Ralf Rantzau and Raplh Winkler},
   title = {{Divide et Impera: A Flexible Integration of Layout Planning and Logistics Simulation through Data Change Propagation.}},
   journal = {The CIRP - Journal of Manufacturing Systems},
   editor = {J. Peklenik},
   publisher = {CIRP},
   volume = {33},
   number = {6},
   pages = {509--518},
   type = {Article in Journal},
   month = {November},
   year = {2004},
   language = {English},
   cr-category = {J.6 Computer-Aided Engineering,     C.2.4 Distributed Systems},
   contact = {Uwe.Heinkel@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The turbulent markets lead to new challenges for today’s enterprises, they have to be transformable to stay competitive. Therefore, we developed a new approach that integrates Logistic Simulation and Layout Planning to fulfil the goal of improving the production system. Our approach is based on propagation and transformation of data changes concerning the continuous adaptation tasks among the Layout Planning and Logistics Simulation systems. Instead of relying on a tightly integrated global data schema, we connect systems only as far as required by building “bridges” between them. The systems that participate in the integration are kept autonomous. We use several state-of-the-art XML technologies in our integration system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2004-14&engl=1}
}
@article {ART-2004-07,
   author = {Stefan Berger and Christoph Mangold and Sebastian Meyer},
   title = {{Wissensmanagement f{\"u}r die wandlungsf{\"a}hige Montage}},
   journal = {wt Werkstattstechnik},
   publisher = {Springer VDI Verlag},
   volume = {94},
   pages = {80--85},
   type = {Article in Journal},
   month = {March},
   year = {2004},
   language = {German},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Turbulente Aufgabenumfelder verlangen von Unternehmen schnelle Antworten und Adaptionen. Wandlungsf{\"a}higkeit und Responsef{\"a}higkeit als entscheidende Erfolgsfaktoren basieren auf Wissen, das kontinuierlich zu verbessern und aufgabenspezifisch zu erneuern ist. Gezeigt wird, wie sich mit Hilfe von Wissensmanagement gezielt die Wandlungsf{\"a}higkeit in und von Unternehmen – speziell in der Montage – erh{\"o}hen l{\"a}sst.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2004-07&engl=1}
}
@article {ART-2004-06,
   author = {Clemens Dorda and Hans-Peter Steiert and J{\"u}rgen Sellentin},
   title = {{Modellbasierter Ansatz zur Anwendungsintegration}},
   journal = {it - information technology},
   publisher = {Oldenbourg},
   volume = {46},
   number = {4},
   pages = {200--210},
   type = {Article in Journal},
   month = {August},
   year = {2004},
   keywords = {EAI; MDA; Model Driven Architecture; Enterprise Application Integration; UML; Unified Modeling Language},
   language = {German},
   cr-category = {D.1.2 Automatic Programming,     D.2.2 Software Engineering Design Tools and Techniques,     D.2.12 Software Engineering Interoperability,     D.2.13 Software Engineering Reusable Software,     H.2.5 Heterogeneous Databases,     I.6.5 Model Development},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-2004-06/ART-2004-06.pdf,     http://www.it-inftech.de},
   contact = {Clemens.Dorda@informatik.uni-stuttgart.de, Hans-Peter.Steiert@daimlerchrysler.com, Juergen.Sellentin@daimlerchrysler.com},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Moderne Produkte zur Anwendungsintegration in Unternehmen (EAI) bieten Werkzeuge, um Integrati-onsszenarien zu modellieren. Allerdings lassen sich damit heterogene IT-Umgebungen bisher immer nur ausschnittsweise darstellen, da die Modelle unter-schiedlicher EAI-Produkte nicht ausgetauscht oder integriert werden k{\"o}nnen. Unser Ziel ist es, die Bil-dung solcher ‚Integrationsinseln' zu vermeiden. Dazu pr{\"a}sentieren wir einen Ansatz, der durch technologie- und herstellerunabh{\"a}ngige Modellierung eine integ-rierte Sicht erlaubt. Unser Vorgehensmodell schl{\"a}gt vor, diese integrierte Sicht werkzeuggest{\"u}tzt auf der Basis von Repositories zu verfeinern, um die Reali-sierung mit konkreten Produkten und das Deploy-ment auf konkreten Plattformen zu automatisieren.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2004-06&engl=1}
}
@article {ART-2004-03,
   author = {Daniela Nicklas and Mitschang Bernhard},
   title = {{On building location aware applications using an open platform based on the NEXUS Augmented World Model}},
   journal = {Software and Systems Modeling},
   editor = {Bernhard Rumpe and Robert France},
   address = {Berlin Heidelberg},
   publisher = {Springer-Verlag},
   volume = {3},
   number = {4},
   type = {Article in Journal},
   month = {December},
   year = {2004},
   keywords = {Augmented World Model; Context-aware applications; Nexus; location-aware; infrastructure; open platform},
   language = {English},
   cr-category = {H.2.1 Database Management Logical Design,     H.2.8 Database Applications},
   contact = {Daniela Nicklas danickla@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {How should the World Wide Web look like if it were for location-based information? And how would mobile, spatially aware applications deal with such a platform? In this paper we present the NEXUS Augmented World Model, an object oriented data model which plays a major role in an open framework for both providers of location-based information and new kinds of applications: the NEXUS platform. We illustrate the usability of the model with several sample applications and show the extensibility of this framework. At last we present a stepwise approach for building spatially aware applications in this environment.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2004-03&engl=1}
}
@article {ART-2004-01,
   author = {Holger Schwarz},
   title = {{Konzeptueller und logischer Data-Warehouse-Entwurf: Datenmodelle und Schematypen f{\"u}r Data Mining und OLAP}},
   journal = {Informatik Forschung und Entwicklung},
   publisher = {Springer},
   volume = {18},
   number = {2},
   pages = {53--67},
   type = {Article in Journal},
   month = {January},
   year = {2004},
   language = {German},
   cr-category = {H.2.1 Database Management Logical Design,     H.2.7 Database Administration,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Im Data-Warehouse-Bereich gibt es sowohl auf der konzeptuellen als auch auf der logischen Ebene unterschiedliche Modellierungsans{\"a}tze, deren Entwicklung sich in der Regel an typischen Fragestellungen aus dem Bereich des Online Analytical Processing (OLAP) orientierte. Daneben spielen aber auch andere Ans{\"a}tze zur Analyse der Daten in einem Data Warehouse eine bedeutende Rolle. Ein wichtiger Vertreter ist Data Mining, mit dessen Hilfe bislang unbekannte Muster und Zusammenh{\"a}nge in Daten identifiziert werden k{\"o}nnen. Im vorliegenden Artikel wird untersucht, in wieweit sich die in der Literatur vorgeschlagenen konzeptuellen Datenmodelle f{\"u}r ein Data Warehouse eignen, das OLAP- und Data-Mining-Analysen gleicherma{\ss}en unterst{\"u}tzt. Hierzu wird das COCOM-Modell, das auf den Modellierungsm{\"o}glichkeiten verschiedener publizierter Modelle aufbaut, vorgestellt und bewertet. F{\"u}r das logische Schema eines Data Warehouse wird h{\"a}ufig ein sogenanntes Star-Schema oder ein Snowflake-Schema erstellt. F{\"u}r diese und weitere Schematypen wird analysiert, welchen Einflu{\ss} die Wahl des logischen Schemas auf Anwendungen aus den Bereichen OLAP und Data Mining hat. Wichtige Kriterien sind hier unter anderem der Informationsgehalt und die Performanz. Insgesamt zeigt dieser Beitrag, dass das COCOM-Modell und das Star-Schema eine gute Grundlage f{\"u}r den integrierten Einsatz von OLAP und Data-Mining bilden.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2004-01&engl=1}
}
@article {ART-2003-17,
   author = {Bernhard Mitschang},
   title = {{Data propagation as an enabling technology for collaboration and cooperative information systems}},
   journal = {Computers in Industry},
   address = {Amsterdam},
   publisher = {Elsevier Science Publishers B.V.},
   volume = {52},
   pages = {59--69},
   type = {Article in Journal},
   month = {September},
   year = {2003},
   language = {English},
   cr-category = {H.5.3 Group and Organization Interfaces},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Collaboration in cooperative information systems, as occurring in concurrent design and engineering, exploits common work and information spaces. In this paper we present the Transaction-Oriented Group and Coordination Service for Data-Centric Applications (TOGA) and the DataPropagator CHAMPAGNE that together realize a shared information space that is controlled by a basic collaboration service. Our approach enables both, firstly, the evolution of a set of separate applications to form a cooperative information system, i.e. it provides a technique towards component-oriented system engineering. Secondly, it can be exploited as a basic service within collaboration frameworks to effectively manage common work and information spaces.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2003-17&engl=1}
}
@article {ART-2003-03,
   author = {Holger Schwarz and Tobias Kraft and Ralf Rantzau and Bernhard Mitschang},
   title = {{Optimierung von Anfragesequenzen in Business-Intelligence-Anwendungen}},
   journal = {it - Information Technology},
   address = {M{\"u}nchen},
   publisher = {Oldenbourg},
   volume = {45},
   number = {4},
   pages = {196--202},
   type = {Article in Journal},
   month = {August},
   year = {2003},
   keywords = {Data Warehouse, Business Intelligence, Anfragesequenzen, OLAP, Data Mining},
   language = {German},
   cr-category = {H.2.4 Database Management Systems,     H.2.7 Database Administration,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Zur Analyse der Daten in einem Data Warehouse kommen unterschiedliche Business-Intelligence-Anwendungen zum Einsatz. Ein wichtiger Erfolgsfaktor f{\"u}r deren Nutzung ist die Effizienz, mit der die erstellten Anfragen ausgef{\"u}hrt werden. In diesem Beitrag wird zun{\"a}chst das typische Verarbeitungsszenario f{\"u}r generierte Anfragesequenzen im Bereich Business Intelligence erl{\"a}utert. Darauf aufbauend wird eine Reihe anwendungsneutraler Optimierungsstrategien erl{\"a}utert und bewertet. Anhand von Messergebnissen wird gezeigt, dass es sich insbesondere bei der Restrukturierung von Anfragesequenzen um einen vielversprechenden Ansatz handelt.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2003-03&engl=1}
}
@article {ART-2003-02,
   author = {Ralf Rantzau and Leonard Shapiro and Bernhard Mitschang and Quan Wang},
   title = {{Algorithms and Applications for Universal Quantification in Relational Databases}},
   journal = {Information Systems},
   editor = {Christian S. Jensen},
   publisher = {Elsevier},
   volume = {28},
   number = {1-2},
   pages = {3--32},
   type = {Article in Journal},
   month = {January},
   year = {2003},
   keywords = {query operators; relational division; grouping; set containment join; frequent itemset discovery},
   language = {English},
   cr-category = {H.2.4 Database Management Systems},
   ee = {http://www.elsevier.nl/locate/is},
   contact = {rrantzau@acm.org},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Queries containing universal quantification are used in many applications, including business intelligence applications and in particular data mining. We present a comprehensive survey of the structure and performance of algorithms for universal quantification. We introduce a framework that results in a complete classification of input data for universal quantification. Then we go on to identify the most efficient algorithm for each such class. One of the input data classes has not been covered so far. For this class, we propose several new algorithms. Thus, for the first time, we are able to identify the optimal algorithm to use for any given input dataset. These two classifications of optimal algorithms and input data are important for query optimization. They allow a query optimizer to make the best selection when optimizing at intermediate steps for the quantification problem. In addition to the classification, we show the relationship between relational division and the set containment join and we illustrate the usefulness of employing universal quantifications by presenting a novel approach for frequent itemset discovery.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2003-02&engl=1}
}
@article {ART-2002-08,
   author = {Bernhard Mitschang and Aiko Frank},
   title = {{A customizable shared information space to support concurrent design}},
   journal = {Special Issue of Computers in Industry},
   address = {Amsterdam},
   publisher = {Elsevier Science Publishers B. V.},
   volume = {48},
   number = {1},
   pages = {45--58},
   type = {Article in Journal},
   month = {May},
   year = {2002},
   issn = {0166-3615},
   language = {English},
   cr-category = {H.2.2 Database Management Physical Design},
   contact = {Bernhard.Mitschang@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Sharing data is an important aspect in distributed design environments and should be supported by an underlying system. Any synchronous access to data is conflict prone. Applying concurrency control and two phase commit are one option to be considered. But design processes also demand for cooperation between the designers. Negotiation about actions on the product under design and the early exchange of preliminary results are crucial issues. Controlled data access by itself does not fulfil all the needs for cooperation. We will present a new approach that relies on a concept and system model which integrates concurrent activities by a joint information space offering flexible protocols for cooperation on the shared objects. We will describe the customizability of the protocols to effectively support different cooperative scenarios.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2002-08&engl=1}
}
@article {ART-2002-03,
   author = {Steffen (ifp) Volz and Matthias Gro{\ss}mann and Nicola H{\"o}nle and Daniela Nicklas and Thomas Schwarz},
   title = {{Integration mehrfach repr{\"a}sentierter Stra{\ss}enverkehrsdaten f{\"u}r eine f{\"o}derierte Navigation}},
   journal = {it+ti},
   publisher = {Oldenbourg Verlag},
   volume = {44},
   number = {5},
   pages = {260--267},
   type = {Article in Journal},
   month = {October},
   year = {2002},
   keywords = {Mobile Computing; Augmented World Model; GDF; ATKIS},
   language = {German},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,     H.2.1 Database Management Logical Design},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-2002-03/ART-2002-03.pdf,     http://www.nexus.uni-stuttgart.de,     http://www.it-ti.de},
   contact = {steffen.volz@ifp.uni-stuttgart.de, matthias.grossmann@informatik.uni-stuttgart.de, nicola.hoenle@informatik.uni-stuttgart.de, daniela.nicklas@informatik.uni-stuttgart.de, thomas.schwarz@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
   abstract = {Die Forschergruppe Nexus entwickelt eine offene, verteilte Plattform f{\"u}r Anwendungen mit Ortsbezug. Dieser Artikel beschreibt, wie Strassenverkehrsdaten aus unterschiedlichen Quellen in das gemeinsame Datenmodell der Plattform integriert werden k{\"o}nnen, um Navigationsanwendungen zu erm{\"o}glichen. Die Abbildung mehrfach repr{\"a}sentierter Daten in einem einheitlichen Schema ist notwendig, um Anfragen auf Quellen zu verteilen, die Ergebnisse zusammenzufassen und so bestehende Daten weiter nutzen zu k{\"o}nnen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2002-03&engl=1}
}
@article {ART-2001-07,
   author = {Daniela Nicklas and Matthias Gro{\ss}mann and Thomas Schwarz and Steffen Volz},
   title = {{Architecture and Data Model of Nexus}},
   journal = {GIS Geo-Informations-Systeme},
   address = {Heidelberg},
   publisher = {Herbert Wichmann Verlag},
   volume = {9},
   pages = {20--24},
   type = {Article in Journal},
   month = {September},
   year = {2001},
   keywords = {Nexus, architecture, data model, location-based, federation, standard class schema, extended class schema},
   language = {English},
   cr-category = {H.2.1 Database Management Logical Design,     H.3.4 Information Storage and Retrieval Systems and Software,     H.3.5 Online Information Services},
   ee = {http://www.nexus.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
   abstract = {The NEXUS platform delivers location-based information and provides additional supporting services enabling intelligent location-based applications. Its architecture is open for both new applications and new information providers, similar to the WWW. The Augmented World Model is a common data model for location-based information. Our platform uses this model to federate such information from different providers into an integrated view for the applications. An example application shows the usage of this platform.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2001-07&engl=1}
}
@article {ART-2001-06,
   author = {Matthias Gro{\ss}mann and Alexander Leonhardi and Bernhard Mitschang and Kurt Rothermel},
   title = {{A World Model for Location-Aware Systems}},
   journal = {Informatik},
   publisher = {Schweizerischer Verband der Informatikorganisationen SVI/FSI},
   volume = {8},
   number = {5},
   pages = {22--25},
   type = {Article in Journal},
   month = {October},
   year = {2001},
   keywords = {Mobile Computing; Location-Aware Applications; Augmented World Model},
   language = {English},
   cr-category = {H.2.3 Database Management Languages,     H.3.4 Information Storage and Retrieval Systems and Software},
   ee = {http://www.nexus.uni-stuttgart.de},
   contact = {matthias.grossmann@informatik.uni-stuttgart.de, alexander.leonhardi@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Advanced location-aware applications require a detailed model of the real world. The goal of the Nexus platform is to provide such a model together with generic functionality to a wide variety of location-aware applications. In this paper, we describe the characteristics of this Augmented World Model and the architecture of the Nexus platform. We look in more detail at the two main components responsible for the main aspects of the world model, namely the spatial data and the position information of mobile objects.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2001-06&engl=1}
}
@article {ART-2000-06,
   author = {Aiko Frank and J{\"u}rgen Sellentin and Bernhard Mitschang},
   title = {{TOGA - a customizable service for data-centric collaboration}},
   journal = {Information Systems, Data Bases: Their Creation Management and Utilization, Special Issue: The 11th International Conference on Advanced Information Systems Engineering (CAiSE*99)},
   editor = {Matthias Jarke and Dennis Shasha},
   address = {Oxford},
   publisher = {Elsevier Science Ltd.},
   volume = {25},
   number = {2},
   pages = {157--176},
   type = {Article in Journal},
   month = {April},
   year = {2000},
   keywords = {Concurrent Engineering; Collaboration, CSCW, Events},
   language = {English},
   cr-category = {D.2.12 Software Engineering Interoperability,     H.2.4 Database Management Systems,     H.3.4 Information Storage and Retrieval Systems and Software,     H.4.1 Office Automation},
   contact = {Contact mitsch@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Collaboration in cooperative information systems, like concurrent design and engineering, exploits common work and information spaces. In this paper we introduce the TOGA service (Transaction-Oriented Group and Coordination Service for Data-Centric Applications), which offers group management facilities and a push model for change propagation w.r.t. shared data, thus allowing for group awareness. Through TOGA’s customizability and its layered architecture the service can be adapted to a variety of different collaboration scenarios. Multiple communication protocols (CORBA, UDP/IP, TCP/IP) are supported as well as basic transaction properties. Our approach enables both, firstly, the evolution of a set of separate applications to form a cooperative information system, i.e., it provides a technique towards component-oriented system engineering. Secondly, it can be exploited as a basic service within collaboration frameworks to effectively manage common work and information spaces. In this paper we report on design issues, implementation aspects, and first experiences gained with the TOGA prototype and its exploitation in an activity coordination and collaboration framework system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2000-06&engl=1}
}
@article {ART-1999-03,
   author = {J{\"u}rgen Sellentin and Bernhard Mitschang},
   title = {{Data-Intensive Intra- and Internet Applications: Experiences using Java and Corba in the World Wide Web}},
   journal = {Object-oriented technology in advanced applications},
   editor = {E. Bertino and S. Urban},
   address = {New York},
   publisher = {John Wiley},
   volume = {5},
   number = {3},
   pages = {181--197},
   type = {Article in Journal},
   month = {October},
   year = {1999},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.3.5 Online Information Services},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {Data-Intensive Intra- and Internet Applications: Experiences using Java and Corba in the World Wide Web.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-1999-03&engl=1}
}
@article {ART-1999-02,
   author = {Reiner Siebert},
   title = {{An Open Architecture for Adaptive Workflow Management Systems}},
   journal = {Transactions of the SDPS: Journal of Integrated Design and Process Science, 1999},
   editor = {Society for Design and Process Science},
   address = {Austin, Texas},
   publisher = {Society for Design and Process Science},
   pages = {1--9},
   type = {Article in Journal},
   month = {January},
   year = {1999},
   keywords = {Workflow Management; Adaptive Workflow Systems; Enterprise Process Management; Cooperative Work},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-1999-02/ART-1999-02.pdf},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {One of the main tasks of workflow management systems is the coordination of activities in business processes. In this paper, a solution framework is introduced to support adaptive workflows with complex and unstructured task dependencies. In chapter one the research direction is motivated and a short overview of the PoliFlow project is given. Then, requirements for enterprise process management systems are identified with a special focus on coordination and control of unstructured processes. Taking these requirements as a basis, an integrated approach for adaptive workflow support is presented. A flexible workflow model including advanced control structures allows actors to modify workflow instances during runtime. Finally, a reference architecture is proposed. By example of the SWATS system, it is illustrated how an adaptive support layer can be integrated to extend existing workflow management systems. The paper concludes with an overview over the current state of the work and future issues.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-1999-02&engl=1}
}
@article {ART-1999-01,
   author = {Wolfgang Becker and Cora Burger and J{\"u}rgen Klarmann and Ottokar Kulendik and Frank Schiele and Kerstin Schneider},
   title = {{Rechnerunterst{\"u}tzung f{\"u}r Interaktionen zwischen Menschen: Begriffskl{\"a}rung, Anwendungsgebiete und Basiswerkzeuge.}},
   journal = {Informatik Spektrum},
   publisher = {Springer-Verlag},
   volume = {22},
   number = {6},
   pages = {422--435},
   type = {Article in Journal},
   month = {December},
   year = {1999},
   keywords = {CSCW, Groupware, Teleteaching, Workflow-Management, Elektronischer Handel},
   language = {German},
   cr-category = {H.4.3 Information Systems Applications Communications Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Die Rechnerunterst{\"u}tzung von Interaktionen zwischen Menschen wird in unterschiedlichen Forschungsgebieten untersucht. Das f{\"u}hrt zu einer vielf{\"a}ltigen, {\"u}berlappenden Begriffsbildung unter den Disziplinen. Die dadurch bedingte Begriffsverwirrung behindert fach{\"u}bergreifende gemeinsame Entwicklung, Standardisierung und Wieder- / Weiterverwendung von Ergebnissen. Im folgenden werden daher breit verwendete Grundbegriffe wie CSCW, Kooperation, Konkurrenz, Koordination, Kommunikation, Groupware, Workflow-Management, Teleteaching und Elektronischer Markt geeignet geordnet. Schwerpunkte liegen dabei auf den m{\"o}glichen Anwendungsgebieten sowie auf den durch Rechner unterst{\"u}tzten technischen Grundinteraktionen. Damit soll der Beitrag Anwendern und Entwicklern helfen, f{\"u}r konkrete Anwendungsprobleme Anforderungen ermitteln zu k{\"o}nnen und Grundelemente in existierenden komplexen Systemen zu identifizieren.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-1999-01&engl=1}
}
@article {ART-1998-10,
   author = {Stefan De{\ss}loch and Theo H{\"a}rder and Nelson Mattos and Bernhard Mitschang and Joachim Thomas},
   title = {{Advanced Data Processing in KRISYS: Modeling Concepts, Implementation Techniques, and Client/Server Issues}},
   journal = {VLDB Journal},
   publisher = {Springer},
   volume = {7},
   number = {2},
   pages = {79--95},
   type = {Article in Journal},
   month = {May},
   year = {1998},
   keywords = {Object-oriented modeling concepts; Consistency control; Query processing; Run-time optimization; Client/server architectures},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems},
   abstract = {The increasing power of modern computers is steadily opening up new application domains for advanced data processing such as engineering and knowledge-based applications. To meet their requirements, concepts for advanced data management have been investigated during the last decade, especially in the field of object orientation. Over the last couple of years, the database group at the University of Kaiserslautern has been developing such an advanced database system, the KRISYS prototype. In this article, we report on the results and experiences obtained in the course of this project. The primary objective for the first version of KRISYS was to provide semantic features, such as an expressive data model, a set-oriented query language, deductive as well as active capabilities. The first KRISYS prototype became completely operational in 1989. To evaluate its features and to stabilize its functionality, we started to develop several applications with the system. These experiences marked the starting point for an overall redesign of KRISYS. Major goals were to tune KRISYS and its query-processing facilities to a suitable client/server environment, as well as to provide elaborate mechanisms for consistency control comprising semantic integrity constraints, multi-user synchronization, and failure recovery. The essential aspects of the resulting client/server architecture are embodied by the client-side data management needed to effectively support advanced applications and to gain the required system performance for interactive work. The project stages of KRISYS properly reflect the essential developments that have taken place in the research on advanced database systems over the last years. Hence, the subsequent discussions will bring up a number of important aspects with regard to advanced data processing that are of significant general importance, as well as of general applicability to database systems.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-1998-10&engl=1}
}
@inbook {INBOOK-2018-01,
   author = {Jasmin Guth and Uwe Breitenb{\"u}cher and Michael Falkenthal and Paul Fremantle and Oliver Kopp and Frank Leymann and Lukas Reinfurt},
   title = {{A Detailed Analysis of IoT Platform Architectures: Concepts, Similarities, and Differences}},
   series = {Internet of Everything: Algorithms, Methodologies, Technologies and Perspectives},
   publisher = {Springer},
   pages = {81--101},
   type = {Article in Book},
   month = {January},
   year = {2018},
   isbn = {10.1007/978-981-10-5861-5_4},
   keywords = {Internet of Things; IoT; Platform; Reference Architecture; FIWARE; OpenMTC; SiteWhere; Webinos; AWS IoT; IBM Watson IoT Platform; Microsoft Azure IoT Hub},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.4.7 Operating Systems Organization and Design,     H.3.4 Information Storage and Retrieval Systems and Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The IoT is gaining increasing attention. The overall aim is to interconnect the physical with the digital world. Therefore, the physical world is measured by sensors and translated into processible data, and data has to be translated into commands to be executed by actuators. Due to the growing interest in IoT, the number of platforms designed to support IoT has risen considerably. As a result of different approaches, standards, and use cases, there is a wide variety and heterogeneity of IoT platforms. This leads to difficulties in comprehending, selecting, and using appropriate platforms. In this work, we tackle these issues by conducting a detailed analysis of several state-of-the-art IoT platforms in order to foster the understanding of the (i) underlying concepts, (ii) similarities, and (iii) differences between them. We show that the various components of the different platforms can be mapped to an abstract reference architecture, and analyze the effectiveness of this mapping.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2018-01&engl=1}
}
@inbook {INBOOK-2017-04,
   author = {Laura Kassner and Christoph Gr{\"o}ger and Jan K{\"o}nigsberger and Eva Hoos and Cornelia Kiefer and Christian Weber and Stefan Silcher and Bernhard Mitschang},
   title = {{The Stuttgart IT Architecture for Manufacturing}},
   series = {Enterprise Information Systems: 18th International Conference, ICEIS 2016, Rome, Italy, April 25--28, 2016, Revised Selected Papers},
   publisher = {Springer International Publishing},
   series = {Lecture Notes in Business Information Processing},
   volume = {291},
   pages = {53--80},
   type = {Article in Book},
   month = {June},
   year = {2017},
   isbn = {978-3-319-62386-3},
   doi = {10.1007/978-3-319-62386-3_3},
   language = {English},
   cr-category = {H.4.0 Information Systems Applications General,     D.2.12 Software Engineering Interoperability,     J.2 Physical Sciences and Engineering},
   ee = {https://link.springer.com/chapter/10.1007/978-3-319-62386-3_3},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The global conditions for manufacturing are rapidly changing towards shorter product life cycles, more complexity and more turbulence. The manufacturing industry must meet the demands of this shifting environment and the increased global competition by ensuring high product quality, continuous improvement of processes and increasingly flexible organization. Technological developments towards smart manufacturing create big industrial data which needs to be leveraged for competitive advantages. We present a novel IT architecture for data-driven manufacturing, the Stuttgart IT Architecture for Manufacturing (SITAM). It addresses the weaknesses of traditional manufacturing IT by providing IT systems integration, holistic data analytics and mobile information provisioning. The SITAM surpasses competing reference architectures for smart manufacturing because it has a strong focus on analytics and mobile integration of human workers into the smart production environment and because it includes concrete recommendations for technologies to implement it, thus filling a granularity gap between conceptual and case-based architectures. To illustrate the benefits of the SITAM{\^a}€™s prototypical implementation, we present an application scenario for value-added services in the automotive industry.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2017-04&engl=1}
}
@inbook {INBOOK-2017-03,
   author = {Christoph Stach and Frank Steimle and Ana Cristina Franco da Silva},
   title = {{TIROL: The Extensible Interconnectivity Layer for mHealth Applications}},
   series = {Information and Software Technologies: 23nd International Conference, ICIST 2017, Druskininkai, Lithuania, October 12-14, 2017, Proceedings},
   address = {Cham},
   publisher = {Springer International Publishing},
   series = {Communications in Computer and Information Science},
   pages = {1--12},
   type = {Article in Book},
   month = {October},
   year = {2017},
   keywords = {mHealth; medical devices; harmonization; interconnectivity layer},
   language = {English},
   cr-category = {K.4.1 Computers and Society Public Policy Issues,     J.3 Life and Medical Sciences},
   contact = {Senden Sie eine E-Mail an Christoph.Stach@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {The prevalence of various chronic conditions is on the rise. Periodic screenings and a persistent therapy are necessary in order to aid the patients. Increasing medical costs and overburdened physicians are the consequences. A telemedical self-management of the illness is considered as the answer to this problem. For this purpose mHealth applications, i.e., the synergy of common smartphones and medical metering devices, are vitally needed. However, poor device interoperability due to heterogeneous connectivity methods hamper the usage of such applications. For this very reason, we introduce the concept for an exTensible InteRcOnnectivity Layer (TIROL) to deal with the interconnectivity issues of mHealth applications. Furthermore, we present a prototypical implementation for TIROL to demonstrate the benefits of our approach.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2017-03&engl=1}
}
@inbook {INBOOK-2017-01,
   author = {Pascal Hirmer and Michael Behringer},
   title = {{FlexMash 2.0 – Flexible Modeling and Execution of Data Mashups}},
   series = {Rapid Mashup Development Tools - Second International Rapid Mashup Challenge, RMC 2016, Lugano, Switzerland, June 6, 2016, Revised Selected Papers},
   publisher = {Springer International Publishing},
   series = {Communications in Computer and Information Science},
   volume = {696},
   pages = {10--29},
   type = {Article in Book},
   month = {January},
   year = {2017},
   isbn = {978-3-319-53173-1},
   isbn = {978-3-319-53174-8},
   doi = {10.1007/978-3-319-53174-8},
   issn = {1865-0929},
   keywords = {ICWE Rapid Mashup Challenge 2016; FlexMash; Data processing and integration; Pipes and Filters},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.0 Information Storage and Retrieval General,     E.1 Data Structures},
   ee = {http://link.springer.com/chapter/10.1007/978-3-319-53174-8_2},
   contact = {pascal.hirmer@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In recent years, the amount of data highly increases through cheap hardware, fast network technology, and the increasing digitization within most domains. The data produced is oftentimes heterogeneous, dynamic and originates from many highly distributed data sources. Deriving information and, as a consequence, knowledge from this data can lead to a higher effectiveness for problem solving and thus higher profits for companies. However, this is a great challenge {\^a}€“ oftentimes referred to as Big Data problem. The data mashup tool FlexMash, developed at the University of Stuttgart, tackles this challenge by offering a means for integration and processing of heterogeneous, dynamic data sources. By doing so, FlexMash focuses on (i) an easy means to model data integration and processing scenarios by domain-experts based on the Pipes and Filters pattern, (ii) a flexible execution based on the user{\^a}€™s non-functional requirements, and (iii) high extensibility to enable a generic approach. A first version of this tool was presented during the ICWE Rapid Mashup Challenge 2015. In this article, we present the new version FlexMash 2.0, which introduces new features such as cloud-based execution and human interaction during runtime. These concepts have been presented during the ICWE Rapid Mashup Challenge 2016.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2017-01&engl=1}
}
@inbook {INBOOK-2016-04,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Oliver Kopp and K{\'a}lm{\'a}n K{\'e}pes and Frank Leymann and Johannes Wettinger},
   title = {{Hybrid TOSCA Provisioning Plans: Integrating Declarative and Imperative Cloud Application Provisioning Technologies}},
   series = {Cloud Computing and Services Science},
   publisher = {Springer International Publishing},
   series = {Communications in Computer and Information Science},
   volume = {581},
   pages = {239--262},
   type = {Article in Book},
   month = {February},
   year = {2016},
   doi = {10.1007/978-3-319-29582-4_13},
   isbn = {978-3-319-29581-7},
   keywords = {Cloud application provisioning; TOSCA; Hybrid plans; Automation; Declarative modelling; Imperative modelling; Integration},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The efficient provisioning of complex applications is one of the most challenging issues in Cloud Computing. Therefore, various provisioning and configuration management technologies have been developed that can be categorized as follows: imperative approaches enable a precise specification of the low-level tasks to be executed whereas declarative approaches focus on describing the desired goals and constraints. Since complex applications employ a plethora of heterogeneous components that must be wired and configured, typically multiple of these technologies have to be integrated to automate the entire provisioning process. In a former work, we presented a workflow modelling concept that enables the seamless integration of imperative and declarative technologies. This paper is an extension of that work to integrate the modelling concept with the Cloud standard TOSCA. In particular, we show how Hybrid Provisioning Plans can be created that retrieve all required information about the desired provisioning directly from the corresponding TOSCA model. We validate the practical feasibility of the concept by extending the OpenTOSCA runtime environment and the workflow language BPEL.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2016-04&engl=1}
}
@inbook {INBOOK-2016-01,
   author = {Pascal Hirmer and Bernhard Mitschang},
   title = {{FlexMash - Flexible Data Mashups Based on Pattern-Based Model Transformation}},
   series = {Rapid Mashup Development Tools},
   publisher = {Springer International Publishing},
   series = {Communications in Computer and Information Science},
   volume = {591},
   pages = {12--30},
   type = {Article in Book},
   month = {February},
   year = {2016},
   isbn = {978-3-319-28726-3},
   doi = {10.1007/978-3-319-28727-0_2},
   keywords = {ICWE rapid mashup challenge 2015; Data mashups; Transformation patterns; TOSCA; Cloud computing},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.0 Information Storage and Retrieval General,     E.1 Data Structures},
   ee = {http://dx.doi.org/10.1007/978-3-319-28727-0_2},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, the ad-hoc processing and integration of data is an important issue due to fast growing IT systems and an increased connectivity of the corresponding data sources. The overall goal is deriving high-level information based on a huge amount of low-level data. However, an increasing amount of data leads to high complexity and many technical challenges. Especially non-IT expert users are overburdened with highly complex solutions such as Extract-Transform-Load processes. To tackle these issues, we need a means to abstract from technical details and provide a flexible execution of data processing and integration scenarios. In this paper, we present an approach for modeling and pattern-based execution of data mashups based on Mashup Plans, a domain-specific mashup model that has been introduced in previous work. This non-executable model can be mapped onto different executable ones depending on the use case scenario. The concepts introduced in this paper were presented during the Rapid Mashup Challenge at the International Conference on Web Engineering 2015. This paper presents our approach, the scenario that was implemented for this challenge, as well as the encountered issues during its preparation.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2016-01&engl=1}
}
@inbook {INBOOK-2015-06,
   author = {Uwe Breitenb{\"u}cher and Tobias Binz and Oliver Kopp and Frank Leymann and Matthias Wieland},
   title = {{Context-Aware Provisioning and Management of Cloud Applications}},
   series = {Cloud Computing and Services Sciences},
   publisher = {Springer International Publishing},
   pages = {151--168},
   type = {Article in Book},
   month = {December},
   year = {2015},
   doi = {10.1007/978-3-319-25414-2_10},
   isbn = {978-3-319-25413-5},
   keywords = {Application Management; Provisioning; Context; Automation; Cloud Computing},
   language = {English},
   cr-category = {K.6 Management of Computing and Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Architecture of Application Systems},
   abstract = {The automation of application provisioning and management is one of the most important issues in Cloud Computing. However, the steadily increasing number of different services and software components employed in composite Cloud applications leads to a high risk of unintended side effects when different technologies work together that bring their own proprietary management APIs. Due to unknown dependencies and the increasing diversity and heterogeneity of employed technologies, even small management tasks on a single component may compromise the whole application functionality for reasons that are neither expected nor obvious to non-experts. In this paper, we tackle these issues by introducing a method that enables detecting and correcting unintended effects of provisioning and management tasks in advance by analyzing the context in which the tasks are executed. We validate the method practically and show how context-aware expert management knowledge can be applied fully automatically to provision and manage running Cloud applications.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2015-06&engl=1}
}
@inbook {INBOOK-2015-02,
   author = {Eva Hoos and Christoph Gr{\"o}ger and Stefan Kramer and Bernhard Mitschang},
   title = {{ValueApping: An Analysis Method to Identify Value-Adding Mobile Enterprise Apps in Business Processes}},
   series = {Enterprise Information Systems},
   publisher = {Springer International Publishing},
   series = {Lecture Notes in Business Information Processing},
   volume = {227},
   type = {Article in Book},
   month = {September},
   year = {2015},
   language = {English},
   cr-category = {H.1.1 Systems and Information Theory},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Mobile enterprise apps provide novel possibilities for the optimization and redesign of business processes, e.g., by the elimination of paper-based data acquisitioning or ubiquitous access to up-to-date information. To leverage these business potentials, a critical success factor is the identification and evaluation of valueadding MEAs based on an analysis of the business process. For this purpose, we present ValueApping, a systematic analysis method to identify usage scenarios for value-adding mobile enterprise apps in business processes and to analyze their business benefits. We describe the different analysis steps and corresponding analysis artifacts of ValueApping and discuss the results of a case-oriented evaluation in the automotive industry.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2015-02&engl=1}
}
@inbook {INBOOK-2013-02,
   author = {Sylvia Radesch{\"u}tz and Holger Schwarz and Marko Vrhovnik and Bernhard Mitschang},
   title = {{A Combination Framework for Exploiting the Symbiotic Aspects of Process and Operational Data in Business Process Optimization}},
   series = {Information Reuse and Integration in Academia and Industry},
   publisher = {Springer},
   pages = {29--49},
   type = {Article in Book},
   month = {September},
   year = {2013},
   language = {German},
   cr-category = {H.2 Database Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {A profound analysis of all relevant business data in a company is necessary for optimizing business processes effectively. Current analyses typically run either on business process execution data or on operational business data. Correlations among the separate data sets have to be found manually under big effort. However, to achieve a more informative analysis and to fully optimize a company's business, an efficient consolidation of all major data sources is indispensable. Recent matching algorithms are insufficient for this task since they are restricted either to schema or to process matching. We present a new matching framework to (semi-)automatically combine process data models and operational data models for performing such a profound business analysis. We describe the algorithms and basic matching rules underlying this approach as well as an experimental study that shows the achieved high recall and precision.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2013-02&engl=1}
}
@inbook {INBOOK-2013-01,
   author = {Stefan Silcher and Max Dinkelmann and Jorge Minguez and Bernhard Mitschang},
   title = {{Advanced Product Lifecycle Management by Introducing Domain-Specific Service Buses}},
   series = {Enterprise Information Systems},
   publisher = {Springer Berlin Heidelberg},
   series = {Lecture Notes in Business Information Processing},
   volume = {141},
   pages = {92--107},
   type = {Article in Book},
   month = {October},
   year = {2013},
   doi = {10.1007/978-3-642-40654-6_6},
   isbn = {978-3-642-40653-9 (Print), 978-3-642-40654-6 (Online)},
   keywords = {Product lifecycle management; Service-oriented architecture; Enterprise service bus; Modular IT integration},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Manufacturing companies are operating today in a turbulent market. Permanently changing preconditions forces the companies to continuously adapt their business and production processes to get the optimal productivity. Therefore, a vast number of IT systems are introduced to support tasks along the product life cycle. These systems are typically isolated and their communication, cooperation and in special cases also integration results in more and more overhead and gets quickly unmanageable. Further problems arise, when building continuous processes within the Product Lifecycle Management (PLM). The service-based PLM architecture faces these challenges and presents a homogeneous integration approach based on Enterprise Service Bus (ESB) technology. The characteristics and findings of our approach are presented and the inclusion of security features is discussed. A proof-of-concept for the production planning and the corresponding Production Planning Service Bus are presented. Finally, the advantages of the service-based approach compared to traditional integration solutions are pointed out.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2013-01&engl=1}
}
@inbook {INBOOK-2012-01,
   author = {Stefan Silcher and Jorge Minguez and Bernhard Mitschang},
   title = {{A Novel Approach to Product Lifecycle Management based on Service Hierarchies}},
   series = {Recent Trends in Information Reuse and Integration},
   address = {Vienna},
   publisher = {Springer},
   pages = {343--362},
   type = {Article in Book},
   month = {January},
   year = {2012},
   isbn = {978-3-7091-0738-6},
   keywords = {Product Lifecycle Management; Service Oriented Architecture; Enterprise Service Bus},
   language = {English},
   cr-category = {D.2.11 Software Engineering Software Architectures,     D.2.13 Software Engineering Reusable Software},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {In grown IT infrastructures for Product Lifecycle Management (PLM), applications are mostly interconnected using point-to-point interfaces. This leads to complex and unmanageable infrastructures. A continuous and efficient integration is a key requirement for successful PLM implementations. The Service Oriented Architecture (SOA) is a prevalent solution to efficiently integrate legacy applications and systems into business processes. Its possibility for loose coupling of services enables the replacement of point-to-point interfaces, this way reducing the complexity of managing and maintaining the IT infrastructure. This article introduces a SOA-based solution to the integration of all PLM phases. We employ an Enterprise Service Bus (ESB) as service-based integration and communication infrastructure and introduce three exemplary scenarios to illustrate the benefits of using an ESB as compared to alternative PLM infrastructures. Furthermore, we describe a service hierarchy that extends PLM functionality with value-added services by mapping business processes to data integration services.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2012-01&engl=1}
}
@inbook {INBOOK-2009-04,
   author = {Rodrigo Salvador Monteiro and Geraldo Zimbr{\~a}o and Jano Moreira de Souza and Holger Schwarz and Bernhard Mitschang},
   title = {{Exploring Calendar-based Pattern Mining in Data Streams}},
   series = {Complex Data Warehousing and Knowledge Discovery for Advanced Retrieval Development: Innovative Methods and Applications},
   publisher = {IGI Global},
   pages = {1--30},
   type = {Article in Book},
   month = {June},
   year = {2009},
   isbn = {978-1-60566-748-5},
   language = {English},
   cr-category = {H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Finally, Chapter XVI introduces a calendar-based pattern mining that aims at identifying patterns on specific calendar partitions in continuous data streams. The authors present how a data warehouse approach can be applied to leverage calendar-based pattern mining in data streams and how the framework of the DWFIST approach can cope with tight time constraints imposed by data streams, keep storage requirements at a manageable level and, at the same time, support calendar-based frequent itemset mining. The minimum granularity of analysis, parameters of the data warehouse (e.g. mining minimum support) and parameters of the database (e.g. extent size) provide ways to tune the load performance.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2009-04&engl=1}
}
@inbook {INBOOK-2009-01,
   author = {Cataldo Mega and Kathleen Krebs and Frank Wagner and Norbert Ritter and Bernhard Mitschang},
   title = {{Content-Management-Systeme der n{\"a}chsten Generation}},
   series = {Wissens- und Informationsmanagement ; Strategien, Organisation und Prozesse},
   address = {Wiesbaden},
   publisher = {Gabler Verlag},
   pages = {539--567},
   type = {Article in Book},
   month = {January},
   year = {2009},
   isbn = {978-3-8349-0937-4},
   language = {German},
   cr-category = {H.3.2 Information Storage},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {...},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2009-01&engl=1}
}
@inbook {INBOOK-2008-16,
   author = {Anne-Sophie Br{\"u}ggen and Sarah Jessen and Laura Kassner and Thorsten Liebelt and Yvonne Schweizer and Annika Weschler},
   title = {{Imagination}},
   series = {Kognition und Verhalten: Theory of Mind, Zeit, Imagination, Vergessen, Altruismus},
   address = {M{\"u}nster},
   publisher = {LIT-Verlag},
   series = {Interdisziplin{\"a}re Forschungsarbeiten am FORUM SCIENTIARUM},
   volume = {1},
   pages = {85--128},
   type = {Article in Book},
   month = {January},
   year = {2008},
   isbn = {978-3-8258-1826-5},
   keywords = {Imagination; Interdisziplin{\"a}re Forschung; K{\"u}nstliche Intelligenz},
   language = {German},
   cr-category = {A.m General Literature, Miscellaneous},
   ee = {http://www.forum-scientiarum.uni-tuebingen.de/studium/studienkolleg/archiv/studienkolleg0607.html},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {'Die F{\"a}higkeit des Menschen zu denken ist Thema der Geisteswissenschaften, aber auch der Psychologie, Anthropologie und zunehmend der Neurowissenschaften. Dieser Sammelband, in dem die Abschlussarbeiten des ersten Jahrgangs des Studienkollegs am Forum Scientiarum der Universit{\"a}t T{\"u}bingen dokumentiert werden, besch{\"a}ftigt sich mit einigen ausgew{\"a}hlten Themen im Zusammenhang der biologischen und kulturellen Grundlagen menschlichen Denkens.' (Autorenreferat). Inhaltsverzeichnis: Judith Benz-Schwarzburg, Linda Braun, Alexander Ecker, Tobias Kobitzsch, Christian L{\"u}cking: Theory of Mind bei Mensch und Tier (I-50); Nina Baier, Christoph Paret, Sarah Wiethoff: Zeit und Zeitbewusstsein (51-84); Anne-Sophie Br{\"u}ggen, Sarah Jessen, Laura Kassner, Thorsten Liebelt, Yvonne Schweizer, Annika Weschler: Imagination (85-128); Rainer Engelken, Kathleen Hildebrand, Nikolaus Schmitz, Silke Wagenh{\"a}user: Vergessen als eine Grundlage menschlichen Denkens (129-176); Christian G{\"a}ssler, Ralf J. Geretshauser, Bilal Hawa, Steffen Kudella, Sebastian Sehr, Nora Umbach: Altruismus (177-211).},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2008-16&engl=1}
}
@inbook {INBOOK-2008-02,
   author = {Clemens Dorda and Uwe Heinkel and Bernhard Mitschang},
   title = {{A Concept for Applying Model-driven Engineering to Application Integration}},
   series = {Challenges In Information Technology Management},
   address = {Singapur},
   publisher = {World Scientific},
   pages = {168--174},
   type = {Article in Book},
   month = {May},
   year = {2008},
   isbn = {139789812819062},
   isbn = {109812819061},
   keywords = {Enterprise Application Integration, Model-Driven Engineering, Software Lifecycle, EAI, MDA, MDE, UML, Unified Modeling Language},
   language = {English},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques,     D.2.13 Software Engineering Reusable Software,     I.6.5 Model Development},
   contact = {Clemens.Dorda@ipvs.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Modern software for Enterprise Application Integration (EAI) provides tools for modeling integration scenarios. A drawback of these tools is the lack of functionality for exchanging or integrating models from different EAI products. Consequently, developers are only partially able to describe real heterogeneous IT environments. Our goal is to avoid the creation of these so-called ``integration islands''. For that purpose we present an approach which introduces an abstract view by technology-independent and multivendor-capable modeling for both development and maintenance. With this approach, we propose a toolset- and repository-based refinement of the abstract view to automate implementation with real products and deployment on real platforms.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2008-02&engl=1}
}
@inbook {INBOOK-2006-02,
   author = {Rodrigo Salvador Monteiro and Geraldo Zimbr{\~a}o and Holger Schwarz and Bernhard Mitschang and Jano Moreira De Souza},
   title = {{DWFIST: The Data Warehouse of Frequent Itemsets Tactics Approach}},
   series = {Processing and Managing Complex Data for Decision Support},
   publisher = {Idea Group Publishing},
   pages = {1--30},
   type = {Article in Book},
   month = {April},
   year = {2006},
   isbn = {1-59140-655-2},
   language = {English},
   cr-category = {H.2.7 Database Administration,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {This chapter presents the core of the DWFIST approach, which is concerned with supporting the analysis and exploration of frequent itemsets and derived patterns, e.g. association rules, in transactional datasets. The goal of this new approach is to provide (1) flexible pattern-retrieval capabilities without requiring the original data during the analysis phase, and (2) a standard modeling for data warehouses of frequent itemsets allowing an easier development and reuse of tools for analysis and exploration of itemset-based patterns. Instead of storing the original datasets, our approach organizes frequent itemsets holding on different partitions of the original transactions in a data warehouse that retains sufficient information for future analysis. A running example for mining calendar-based patterns on data streams is presented. Staging area tasks are discussed and standard conceptual and logical schemas are presented. Properties of this standard modeling allow to retrieve frequent itemsets holding on any set of partitions along with upper and lower bounds on their frequency counts. Furthermore, precision guarantees for some interestingness measures of association rules are provided as well.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2006-02&engl=1}
}
@inbook {INBOOK-2005-01,
   author = {Bernhard Mitschang and Daniela Nicklas and Matthias Grossmann and Thomas Schwarz and Nicola H{\"o}nle},
   title = {{Federating Location-Based Data Services}},
   series = {Data Management in a Connected World: Essays Dedicated to Hartmut Wedekind on the Occasion of His 70th Birthday},
   address = {Berlin},
   publisher = {Springer-Verlag},
   series = {Lecture Notes in Computer Science},
   volume = {3551},
   pages = {17--35},
   type = {Article in Book},
   month = {June},
   year = {2005},
   isbn = {3-540-26295-4},
   keywords = {federation; context models; nexus; location-based services},
   language = {English},
   cr-category = {H.2.4 Database Management Systems,     H.3.3 Information Search and Retrieval,     H.3.5 Online Information Services},
   ee = {http://www.nexus.uni-stuttgart.de,     http://dx.doi.org/10.1007/11499923_2},
   contact = {mitsch@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {With the emerging availability of small and portable devices which are able to determine their position and to communicate wirelessly, mobile and spatially-aware applications become feasible. These applications rely on information that is bound to locations and managed by so-called location-based data services. Based on a classification of location-based data services we introduce a service-oriented architecture that is built on a federation approach to efficiently support location-based applications.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2005-01&engl=1}
}
@inbook {INBOOK-2004-08,
   author = {Peter Breitling and Holger Schwarz and Mirka Zimmermann},
   title = {{Verwaltung der Lehr- und Lerninhalte in der Metadatenbank MITO}},
   series = {Information Technology Online: Online-gest{\"u}tztes Lehren und Lernen in informationstechnischen Studieng{\"a}ngen},
   address = {M{\"u}nster, New York, M{\"u}nchen, Berlin},
   publisher = {Waxmann},
   pages = {187--199},
   type = {Article in Book},
   month = {June},
   year = {2004},
   isbn = {3-8309-1358-3},
   language = {German},
   cr-category = {H.0 Information Systems General},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Verwaltung der Lehr- und Lerninhalte in der Metadatenbank MITO},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2004-08&engl=1}
}
@inbook {INBOOK-2003-03,
   author = {Carmen Constantinescu and Uwe Heinkel and Ralf Rantzau and Bernhard Mitschang},
   title = {{A System For Data Change Propagation In Heterogeneous Information Systems}},
   series = {Enterprise Information Systems IV},
   address = {Dordrecht, Netherlands},
   publisher = {Kluwer Academic Publishers},
   pages = {51--59},
   type = {Article in Book},
   month = {January},
   year = {2003},
   isbn = {1-4020-1086-9},
   keywords = {enterprise application integration; manufacturing; repository; propagation},
   language = {English},
   cr-category = {H.3.4 Information Storage and Retrieval Systems and Software},
   contact = {uwe.heinkel@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Today, it is common that enterprises manage several mostly heterogeneous information systems to supply their production and business processes with data. There is a need to exchange data between the information systems while preserving system autonomy. Hence, an integration approach that relies on a single global enterprise data schema is ruled out. This is also due to the widespread usage of legacy systems. We propose a system, called Propagation Manager, which manages dependencies between data objects stored in different information systems. A script specifying complex data transformations and other sophisticated activities, like the execution of external programs, is associated with each dependency. For example, an object update in a source system can trigger data transformations of the given source data for each destination system that depends on the object. Our system is implemented using current XML technologies. We present the architecture and processing model of our system and demonstrate the benefit of our approach by illustrating an extensive example scenario.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2003-03&engl=1}
}
@proceedings {PROC-2018-01,
   author = {Nico Herzberg},
   title = {{Proceedings of the 10th Central European Workshop on Services and their Composition (ZEUS 2018)}},
   editor = {Christoph Hochreiner and Oliver Kopp and J{\"o}rg Lenhard},
   publisher = {CEUR-WS.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {CEUR Workshop Proceedings},
   volume = {2072},
   pages = {76},
   type = {Proceedings},
   month = {April},
   year = {2018},
   issn = {1613-0073},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/PROC-2018-01/PROC-2018-01.pdf,     http://ceur-ws.org/Vol-2072/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems},
   abstract = {In February 2018, we had the pleasure to organize the 10th edition of the ZEUS Workshop in Dresden, Germany. This workshop series offers young researchers an opportunity to present and discuss early ideas and work in progress as well as to establish contacts among young researchers. For this year{\^a}€™s edition, we selected eight regular submissions, two position papers, and one tool demonstration by researchers from Belgium, Egypt, Germany, Italy, and Switzerland for presentation at the workshop. Each submission went through a thorough peer-review process and was assessed by at least three members of the program committee with regard to its relevance and scientific quality. The accepted contributions cover the areas of Microservices, Business Process Management, and the Internet of Things. In addition, the workshop also hosted a tool session to introduce early stage researchers to tools that ease the literature research and the documentation of architectural decisions for software systems.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2018-01&engl=1}
}
@proceedings {PROC-2017-06,
   editor = {Oliver Kopp and J{\"o}rg Lenhard and Cesare Pautasso},
   title = {{Proceedings of the 9th Central European Workshop on Services and their Composition (ZEUS 2017)}},
   publisher = {CEUR-WS.org},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {CEUR Workshop Proceedings},
   volume = {1826},
   pages = {92},
   type = {Proceedings},
   month = {May},
   year = {2017},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {http://dblp.org/db/conf/zeus/zeus2017.html},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems},
   abstract = {},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2017-06&engl=1}
}
@proceedings {PROC-2017-05,
   editor = {Bernhard Mitschang and Norbert Ritter and Holger Schwarz and Meike Klettke and Andreas Thor and Oliver Kopp and Matthias Wieland},
   title = {{Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2017), 17. Fachtagung des GI-Fachbereichs ``Datenbanken und Informationssysteme'' (DBIS)}},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNI},
   volume = {P266},
   pages = {410},
   type = {Proceedings},
   month = {March},
   year = {2017},
   isbn = {978-3-88579-660-2},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {http://dblp.org/db/conf/btw/btw2017w.html},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems},
   abstract = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2017) -- Workshopband},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2017-05&engl=1}
}
@proceedings {PROC-2017-04,
   editor = {Bernhard Mitschang and Daniela Nicklas and Frank Leymann and Harald Sch{\"o}ning and Melanie Herschel and Jens Teubner and Theo H{\"a}rder and Oliver Kopp and Matthias Wieland},
   title = {{Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2017), 17. Fachtagung des GI-Fachbereichs ``Datenbanken und Informationssysteme'' (DBIS)}},
   publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   series = {LNI},
   volume = {P265},
   pages = {637},
   type = {Proceedings},
   month = {March},
   year = {2017},
   isbn = {978-3-88579-659-6},
   language = {English},
   cr-category = {H.4.1 Office Automation},
   ee = {http://dblp.org/db/conf/btw/btw2017.html},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems},
   abstract = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2017)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2017-04&engl=1}
}
@proceedings {PROC-2011-01,
   editor = {Theo H{\"a}rder and Wolfgang Lehner and Bernhard Mitschang and Harald Sch{\"o}ning and Holger Schwarz},
   title = {{Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2011)}},
   publisher = {GI},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {760},
   type = {Proceedings},
   month = {February},
   year = {2011},
   isbn = {978-3-88579-274-1},
   language = {German},
   cr-category = {H.2 Database Management},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems},
   abstract = {The ”BTW” is a biennial conference series focusing on a broad range of topics addressing database management for Business, Technology, and Web. BTW 2011 as its 14th event took place in Kaiserslautern from March 2nd to 4th. This volume contains 24 long and 6 short papers selected for presentation at the conference, 9 industrial contributions, 3 papers or abstracts for the invited talks, 12 demonstration proposals, a panel description, and a paper written by the winner of the dissertation award. The subject areas include core database technology such as query optimization and indexing, DBMS-related prediction models, data streams, processing of large data sets, Web-based information extraction, benchmarking and simulation, and others.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2011-01&engl=1}
}
@proceedings {PROC-2009-02,
   editor = {Kurt Rothermel and Dieter Fritsch and Wolfgang Blochinger and Frank D{\"u}rr},
   title = {{Quality of Context -- Proceedings of the First International Workshop on Quality of Context (QuaCon 2009)}},
   address = {Stuttgart, Germany},
   publisher = {Springer},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   series = {Lecture Notes in Computer Science},
   volume = {5786},
   pages = {184},
   type = {Proceedings},
   month = {June},
   year = {2009},
   isbn = {978-3-642-04558-5},
   keywords = {context-aware systems; location-based services; quality; context},
   language = {English},
   cr-category = {H.2.8 Database Applications,     H.3.3 Information Search and Retrieval,     H.3.5 Online Information Services},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp);     University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;     University of Stuttgart, Institute for Natural Language Processing},
   abstract = {Advances in sensor technology, wireless communication, and mobile devices lead to the proliferation of sensors in our physical environment. At the same time detailed digital models of buildings, towns, or even the globe become widely available. Integrating the huge amount of sensor data into spatial models results in highly dynamic models of the real world, often called context models. A wide range of applications can substantially benefit from context models. However, context data are inherently associated with uncertainty. In general, quality of context information has to be taken into account by both context management and applications. For example, the accuracy, completeness, and trustworthiness of spatial context information such as street or building data are very important for navigation and guidance systems. QuaCon 2009 was the first international scientific meeting that specifically focused on the different aspects of quality of context data. Research in context management and, in particular, context quality, requires an interdisciplinary approach. Therefore, the QuaCon workshop aimed to bring together researchers from various fields to discuss approaches to context quality and to make a consolidated contribution toward an integrated way of treating this topic. We received 19 high-quality paper submissions by researchers from Europe, USA, and Asia. The International Program Committee selected 11 papers for presentation at the workshop. Additionally, five invited contributions by internationally renowned experts in the field were included in the workshop program. The presentations at the workshop showed many facets of quality of context from different research fields including context data management, spatial models, context reasoning, privacy, and system frameworks. The lively discussions underlined the great interest in this topic and in particular led to a deeper understanding of the relations between the various aspects of quality of context. The success of QuaCon 2009 was the result of a team effort. We are grateful to the members of the Program Committee and the external reviewers for their thorough and timely reviews as well as to the authors for their high-quality submissions and interesting talks. We would like to extend special thanks to our invited speakers for their excellent and inspiring keynotes. Finally, we wish to thank all persons involved in the organization of the QuaCon 2009 workshop who did really a great job.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2009-02&engl=1}
}
@proceedings {PROC-2007-01,
   editor = {Christian Becker and Christian S. Jensen and Daniela Nicklas and Jianwen Su},
   title = {{Proceedings of the 8th International Conference on Mobile Data Management (MDM'07) : Mannheim, Germany, May 7-11, 2007}},
   publisher = {IEEE Computer Society},
   institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
   pages = {232},
   type = {Proceedings},
   month = {May},
   year = {2007},
   isbn = {1-4244-1240-4},
   keywords = {mobile data management},
   language = {German},
   cr-category = {E.2 Data Storage Representations,     H.2 Database Management},
   ee = {http://mdm2007.uni-mannheim.de/},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Message from the General Chairs The last two decades have seen a radical change in the way computers and computing are embedded in society. Historically, the Personal Computer and the Internet were the milestones that changed both the computer industry and the way society perceived computers. Today, mobility and the pervasive use of computing devices have resulted in a fundamental change in paradigm. Data is no longer static, residing on a disk and on a personal computer. Now data is something available everywhere, through a multitude of commodity devices and constantly broadcast through a variety of channels. The impact on industry and on the way we work with data has become obvious. For instance, portable digital music players are forcing the music industry to change its business model, soon the same will happen with video and television. Similarly, some major telecommunication companies have recently embarked in an effort to replace the old phone network with an IP based solution for all forms of communication, thereby blurring even further the boundaries between communication and computation. The International Conference on Mobile Data Management lies at the heart of all these changes. In the same way that the Personal Computer and the first spreadsheet revolutionized the industry, the new world of pervasive and ubiquitous access to information requires new approaches to the way we deal with data. And these new approaches need appropriate venues to be presented and discussed. Taking place in Mannheim, Germany, MDM 2007 aims at serving as both as a top research conference as well as a catalyst for new ideas and increased interactions between research and industry. With an excellent technical program encompassing research papers and demonstrators, and the complement of several seminars and workshops dedicated, MDM 2007 has become the leading research venue for innovative research in all aspects data management related to mobile, wearable, and pervasive computing. The success of MDM 2007 is nevertheless not due solely to the importance of the area. Organizing a conference requires the concerted effort of many individuals during a prolonged period of time, often extending well beyond the conference itself. As the Conference Chairs, we would like express our thanks and gratitude to all those who have helped to make MDM 2007 possible. First and foremost to the PC Chairs: Christian Becker, Christian Jensen, and Jianwen Su, who have put together an excellent technical program. The program has been complemented by an exciting demo track thanks to the efforts of Dieter Pfoser. Panels, seminars, and workshops round up the program and have helped to make the conference more attractive. The have been coordinated by Agnes Voisard, Ralf Hartmut G{\"u}ting, and Birgitta K{\"o}nig-Ries, respectively. Special thanks go to Daniela Nicklas for her efforts with the proceedings and to Torben Weis for taking care of financial and budget matters. Klemens B{\"o}hm and Arno Jacobsen were in charge of publicity and advertising the conference. Last but not least, we want to thank the local organizers, who have done a great job in taking care of all the menial but often cumbersome aspects of running a conference: Christian Becker, Wolfgang Effelsberg, Armin Heinzl, and Martin Schader. Looking forward to seeing you in Mannheim! Gustavo Alonso and Pedro Jose Marron General Chairs},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=PROC-2007-01&engl=1}
}
@book {BOOK-2010-01,
   author = {Holger Schwarz},
   title = {{Anfragegenerierende Systeme: Anwendungsanalyse, Implementierungs- und Optimierungskonzepte}},
   address = {Wiesbaden},
   publisher = {Vieweg+Teubner},
   pages = {201},
   type = {Book},
   month = {July},
   year = {2010},
   isbn = {978-3-8348-1298-8},
   language = {German},
   cr-category = {H.4 Information Systems Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institute of Parallel and Distributed Systems},
   abstract = {Flexible Datenzugriffe sind in aktuellen Informationssystemen zur Erf{\"u}llung der gestiegenen Nutzeranforderungen unabdingbar. In verschiedensten Anwendungsgebieten werden daher generative Ans{\"a}tze genutzt, um spezifische Anweisungen f{\"u}r Datenzugriffe bereitzustellen. Holger Schwarz diskutiert Ans{\"a}tze der Anfragegenerierung und beleuchtet Implementierungs- und Optimierungskonzepte. Die Generierungsans{\"a}tze erl{\"a}utert er unter anderem an konkreten Anwendungsszenarien aus Bereichen wie Business Intelligence, Workflow Management und Suchtechnologien. Das betrachtete Spektrum erstreckt sich von den einzelnen Anwendungen bis hin zu Werkzeugen, die bei der Anwendungsentwicklung zum Einsatz kommen. Zweiter Themenschwerpunkt sind aktuelle Ans{\"a}tze zur Optimierung komplexer Strukturen generierter Datenzugriffe. Diese werden vorgestellt und ihr Optimierungspotenzial an Beispielszenarien aufgezeigt.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=BOOK-2010-01&engl=1}
}
@book {BOOK-2007-02,
   editor = {Fabian Kaiser and Sven Schimpf and Holger Schwarz and Mih{\'a}ly Jakob and Severin Beucker},
   title = {{Internetgest{\"u}tzte Expertenidentifikation zur Unterst{\"u}tzung der fr{\"u}hen Innovationsphasen}},
   publisher = {Fraunhofer IRB Verlag},
   pages = {30},
   type = {Book},
   month = {September},
   year = {2007},
   isbn = {978-3-8167-7448-8},
   language = {German},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme},
   abstract = {In dieser Brosch{\"u}re wird eine strukturierte Vorgehensweise beschrieben, mit der f{\"u}r einen Innovationsprozess relevante Themenfelder im und mit Hilfe des Internet identifiziert und spezifiziert, sowie, darauf aufbauend, Experten in diesen Themenfeldern gefunden werden k{\"o}nnen. Im zweiten Teil wird die informationstechnische Umsetzung dieser Vorgehensweise der internetgest{\"u}tzten Identifikation von Experten dargestellt. Anhand eines Anwendungsfalls wird gezeigt, wie Unternehmen durch diese Vorgehensweise im Bezug auf die Planung von Technologiefeldern in den fr{\"u}hen Innovationsphasen unterst{\"u}tzt werden k{\"o}nnen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=BOOK-2007-02&engl=1}
}
@book {BOOK-2007-01,
   editor = {Mih{\'a}ly Jakob and Dierk-Oliver Kiehne and Holger Schwarz and Fabian Kaiser and Severin Beucker},
   title = {{Delphigest{\"u}tztes Szenario-Management und -Monitoring}},
   publisher = {Fraunhofer IRB Verlag},
   pages = {28},
   type = {Book},
   month = {September},
   year = {2007},
   isbn = {978-3-8167-7449-5},
   language = {German},
   cr-category = {H.4 Information Systems Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme},
   abstract = {Die vorliegende Brosch{\"u}re ist Ergebnis des Forschungsprojektes nova-net: Innovation in der Internet{\"o}konomie. Das Projekt nova-net entwickelt Theorien, Strategien und Instrumente zur Unterst{\"u}tzung nachhaltiger Produkt- und Serviceinnovationen in der Internet{\"o}konomie. Dabei wird davon ausgegangen, dass das Internet sowohl eine Quelle als auch ein Instrument f{\"u}r nachhaltige unternehmerische Innovationsprozesse darstellt. In der vorliegenden Brosch{\"u}re wird der Ansatz des delphigest{\"u}tzten Szenario-Managements und seine softwaretechnische Unterst{\"u}tzung durch SEMAFOR vorgestellt.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=BOOK-2007-01&engl=1}
}
@book {BOOK-2006-02,
   author = {Mih{\'a}ly Jakob and Holger Schwarz and Fabian Kaiser},
   title = {{Technologie-Roadmap}},
   publisher = {Fraunhofer IRB Verlag},
   pages = {92},
   type = {Book},
   month = {April},
   year = {2006},
   isbn = {3-8167-7047-9},
   language = {German},
   cr-category = {H.2.4 Database Management Systems,     H.2.7 Database Administration,     H.2.8 Database Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Im Rahmen der vorliegenden Technologie-Roadmap werden Basis-, Integrations- und Anwendungstechnologien aufgezeigt, die die nachhaltige Gestaltung von Innovationsprozessen unterst{\"u}tzen k{\"o}nnen. Die einleitenden Kapitel stellen sowohl den Innovationsprozess und grunds{\"a}tzliche Themenfelder, die im Forschungsprojekt nova-net bearbeitet werden, dar als auch das so genannte Information Workflow, das den Informationsverarbeitungsprozess in sinnvolle Phasen unterteilt und die systematische L{\"o}sung von Innovationsproblemen erm{\"o}glicht. Weiterf{\"u}hrende Teile der Arbeit ordnen f{\"u}r das Innovationsmanagement relevante Technologien den einzelnen Informationsverarbeitungsphasen zu, und widmen sich speziellen Problemen, die in den Themenfeldern des Forschungsprojekts nova-net besondere Beachtung verdienen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=BOOK-2006-02&engl=1}
}
@book {BOOK-2006-01,
   author = {Fabian Kaiser and Holger Schwarz and Mih{\'a}ly Jakob},
   title = {{Internetbasierte Expertensuche}},
   publisher = {Fraunhofer IRB Verlag},
   pages = {29},
   type = {Book},
   month = {April},
   year = {2006},
   isbn = {3-8167-7042-8},
   language = {German},
   cr-category = {H.3.3 Information Search and Retrieval},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Dieses Arbeitspapier diskutiert Methoden und Techniken zur Suche von Personen mit Expertise auf frei definierbaren Themenfeldern. Der Suchraum konzentriert sich dabei auf das Internet und insbesondere die Dienste WWW und E-Mail. Es wird aufgezeigt, weshalb mittels herk{\"o}mmliche Suchmaschinen im Allgemeinen keine befriedigenden Ergebnisse erzielt werden k{\"o}nnen. Auf diesen Schwachpunkten aufbauend werden verschiedene Techniken aufgezeigt, deren Integration eine Expertensuche unterst{\"u}tzen. Im Vordergrund stehen dabei Textklassifizierungssysteme, Crawler und die Integration des Wissens von Suchmaschinen {\"u}ber Struktur und Inhalte des Word Wide Web.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=BOOK-2006-01&engl=1}
}
@book {BOOK-2004-01,
   author = {Marco Litto and Izabela Korajda and Christoph Mangold and Ronald Angerbauer and Winfried Hils and Michael Lerche},
   title = {{Baukastenbasiertes Engineering mit F{\"o}deral - Ein Leitfaden f{\"u}r Maschinen- und Anlagenbauer}},
   address = {Frankfurt a.M},
   publisher = {VDMA Verlag},
   type = {Book},
   month = {March},
   year = {2004},
   isbn = {3-8163-0478-8},
   language = {German},
   cr-category = {H.m Information Systems Miscellaneous},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems},
   abstract = {Maschinen- und Anlagenhersteller haben das Ziel, die Standardisierung und den Wiederholgrad im Engineering und der Produktion zu erh{\"o}hen. Dazu ist es erforderlich, disziplin{\"u}bergreifend Baukastensysteme abzustimmen und zu entwickeln. M{\"o}glich wird dies durch ein Projektierungswerkzeug, das {\"u}bergeordnete Aufgaben des baukastenbasierten Engineerings zentral und durchg{\"a}ngig unterst{\"u}tzt, es gleichzeitig aber auch erm{\"o}glicht, die Spezifika und St{\"a}rken vorhandener Werkzeuge weiterhin zu nutzen. Das F{\"o}deral-Projekt machte sich zum Ziel, den Maschinen- und Anlagenbauern ein solches Projektierungswerkzeug zur Verf{\"u}gung zu stellen. Das vorliegende Dokument soll die Ergebnisse des F{\"o}deral-Projekts weiteren Firmen als Leitfaden f{\"u}r den Aufbau eigener Baukastensystematiken und Baukastensysteme dienen. Dazu enth{\"a}lt er folgende Themenschwerpunkte: - Darstellung der Grundlagen (F{\"o}deral-Methode, F{\"o}derale Informations-Architektur etc.) - Anwendung von Methode und Werkzeug am Beispiel einer Demonstrationsfr{\"a}sanlage - Anwendung von Methode und Werkzeug bei den Firmen Homag und Nagel - Erfahrungen der F{\"o}deral-Partner},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=BOOK-2004-01&engl=1}
}
@book {BOOK-1999-01,
   editor = {Kerstin Schneider},
   title = {{Die Informatik AG - Telekooperation, 2., durchges. Aufl. 1999}},
   publisher = {Teubner},
   pages = {158},
   type = {Book},
   month = {January},
   year = {1999},
   isbn = {3-519-12194-8},
   language = {German},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems;     University of Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner},
   abstract = {Das Bild der Informatik ist bei Jugendlichen von Ger{\"a}ten und konkreten Systemen gepr{\"a}gt. Dies schreckt junge Frauen davon ab, sich mit der Informatik zu befassen oder Informatik zu studieren. Soll dies korrigiert werden, so mu{\ss} man insbesondere den Sch{\"u}lerinnen ein zutreffendes Bild von den Inhalten undder Methodik der Informatik vermitteln. Aus diesem Grund werden seit 1977 an der Fakult{\"a}t Informatik der Universit{\"a}t Stuttgart Veranstaltungen f{\"u}r Sch{\"u}lerinnen der Oberstufe durchgef{\"u}hrt mit dem Ziel, diese {\"u}ber die Prinzipien, Vorgehensweisen und {\"u}ber das Studium der Informatik zu informieren. Das vorliegende Buch beschreibt die Konzepte und Inhalte der Veranstaltung Die Informatik AG - Telekooperation und enth{\"a}lt Auswertungen und Erfahrungen der AG. Eseignet sich einerseits als interessante Einf{\"u}hrung in die Grundlagen der Rechnernetze, das Internet und seine Dienste, insbesondere das WWW und elektronische Post, und soll andererseits als Vorlage zur Durchf{\"u}hrung {\"a}hnlicher Projekte im universit{\"a}ren und schulischen Bereich dienen. Zielgruppe sind Lehrer(innen) der Informatik und solche, die das Internet an Schulen einf{\"u}hren, Dozent(inn)en an Hochschulen, die {\"a}hnliche Kurse ausrichten und nat{\"u}rlich Sch{\"u}ler und Sch{\"u}lerinnen.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=BOOK-1999-01&engl=1}
}