@inproceedings {INPROC-2011-45,
   author = {Matthias Wieland and Daniela Nicklas and Frank Leymann},
   title = {{Context Model for Representation of Business Process Management Artifacts}},
   booktitle = {International Proceedings of Economics Development and Research: IPEDR},
   editor = {Chun Hua Lin and Ming Zhang},
   publisher = {IACSIT PRESS},
   institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Economics and Business Information},
   volume = {9},
   pages = {46--51},
   type = {Konferenz-Beitrag},
   month = {Mai},
   year = {2011},
   isbn = {978-981-08-8869-5},
   issn = {2010-4626},
   keywords = {business process management; workflows; context-awareness; human tasks; services},
   language = {Englisch},
   cr-category = {H.1.2 User/Machine Systems,     H.4.1 Office Automation},
   ee = {http://www.ipedr.com/vol9.htm},
   contact = {wieland@iaas.uni-stuttgart.de},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   abstract = {Context-aware systems adapt their functionality and behavior to the user and his or her situation. To do so, they need context information about the user’s environment, e.g., about different kinds of real world objects. To model and manage context information, many systems have been developed. An important part of context that is often neglected is the state and context of the applications that users are currently executing. The contribution of this paper is to present an extension for a standard context model that allows the representation of the context of workflow based applications. By that, business process management environments are enabled to annotate their context and provide it for other context-aware applications and users.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-45&engl=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {33--42},
   type = {Konferenz-Beitrag},
   month = {November},
   year = {2010},
   isbn = {978-1-4503-0428-3},
   keywords = {GIS, RDF, SPARQL, spatial database, triple store},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@inproceedings {INPROC-2009-64,
   author = {Matthias Wieland and Uwe-Philipp K{\"a}ppeler and Paul Levi and Frank Leymann and Daniela Nicklas},
   title = {{Towards Integration of Uncertain Sensor Data into Context-aware Workflows}},
   booktitle = {Tagungsband INFORMATIK 2009 – Im Focus das Leben, 39. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI)},
   editor = {GI-Edition Lecture Notes in Informatics (LNI)},
   address = {L{\"u}beck},
   publisher = {Lecture Notes in Informatics (LNI)},
   institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Workshop-Beitrag},
   month = {September},
   year = {2009},
   language = {Englisch},
   cr-category = {H.4 Information Systems Applications},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   abstract = {The integration and usage of uncertain sensor data in workflows is a difficult problem. In this paper we describe these difficulties which result from the combination of very distinct areas. On the one hand, applications from area of measurement engineering manage sensors that capture data and annotate the data with technical meta data. On the other hand, context-aware workflows from the BPM area place high level requirements for the quality of context data that is derived from the sensor data. Between those two areas exists a gap that has to be closed by a context management and mediation system, supporting the handling of Quality of Context (QoC). To achieve this the paper presents an QoC aware architecture based on an extension of the existing Nexus Platform and a first approach for matching the workflow requirements with the sensor annotations.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-64&engl=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2009},
   language = {Englisch},
   cr-category = {H.2.4 Database Management Systems},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {1--10},
   type = {Konferenz-Beitrag},
   month = {Januar},
   year = {2009},
   keywords = {GPS, DCCI, Field sampling,},
   language = {Englisch},
   cr-category = {H.3.5 Online Information Services},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@inproceedings {INPROC-2009-10,
   author = {Stephan Urbanski and Eduard Huber and Matthias Wieland and Frank Leymann and Daniela Nicklas},
   title = {{PerFlows for the Computers of the 21st Century}},
   booktitle = {Proceedings of the Seventh Annual IEEE Conference on Pervasive Computing and Communications : PerCom'09 Workshops, in 5th IEEE PerCom Workshop on Context Modeling and Reasoning; Galveston, 17.-21. March 2009},
   publisher = {IEEE Computer Society},
   institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {1--6},
   type = {Workshop-Beitrag},
   month = {M{\"a}rz},
   year = {2009},
   language = {Englisch},
   cr-category = {H.4.1 Office Automation},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   abstract = {In 1995, Mark Weiser introduced a scenario about the future life, where everyday objects are equipped with smart functions and the environment helps us to fulfill our everyday tasks. This paper shows how Weiser’s scenario can be realized by today’s available technologies. We combine PerFlows (to model the flow of daily tasks) and the Nexus context provisioning platform (to model and provide necessary context information to applications and devices). Furthermore, we present SmartGPS, which is able to provide fused location information even if the device is disconnected.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-10&engl=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {1--8},
   type = {Konferenz-Beitrag},
   month = {April},
   year = {2008},
   isbn = {978-0-7695-3154-0},
   language = {Deutsch},
   cr-category = {H.2.8 Database Applications,     G.1.2 Numerical Analysis Approximation},
   contact = {nicola.hoenle@ipvs.uni-stuttgart.de},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Lecture Notes in Computer Science},
   type = {Konferenz-Beitrag},
   month = {Januar},
   year = {2008},
   keywords = {mashup, location-based services, Delivery Context Client Interfaces, DCCI, AJAX, context provisioning},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Lecture Notes in Computer Science},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2008},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {ACM International Conference Proceeding Series},
   volume = {261},
   pages = {700--704},
   type = {Konferenz-Beitrag},
   month = {M{\"a}rz},
   year = {2008},
   doi = {10.1145/1353343.1353429},
   isbn = {978-1-59593-926-5},
   keywords = {location-based services, GPS, DCCI, mashup},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@inproceedings {INPROC-2008-19,
   author = {Matthias Wieland and Peter Kaczmarczyk and Daniela Nicklas},
   title = {{Context Integration for Smart Workflows}},
   booktitle = {Proceedings of the Sixth Annual IEEE International Conference on Pervasive Computing and Communications},
   address = {Hong Kong},
   publisher = {IEEE computer society},
   institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {239--242},
   type = {Konferenz-Beitrag},
   month = {M{\"a}rz},
   year = {2008},
   isbn = {0-7695-3113-X},
   language = {Englisch},
   cr-category = {H.4 Information Systems Applications},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   abstract = {The usage of workflow technology to model and execute business processes is widespread in many enterprises and within the software industry. With the growing maturity of sensors, wireless communication, and distributed computing environments, we can enhance this approach to enable smart workflows, which are business processes crossing the boundary to the physical world. Applications for such processes can be found in many application domains, like logistics or in smart factory environments. To realize smart workflows, workflow engines can be coupled with existing context provisioning systems. However, there is a gap between the rather lowlevel provisioning of context (e.g., sensor data and stock information) and the concepts needed in smart workflows (e.g., ”is a spare tool available?”). The main contribution of this paper is to bridge this gap: we show how integration processes can be used to provide context information at different semantical levels for smart workflows.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-19&engl=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {IEEE Computer Society},
   volume = {Order Number E3113},
   pages = {447--452},
   type = {Workshop-Beitrag},
   month = {M{\"a}rz},
   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 = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {Dezember},
   year = {2008},
   language = {Englisch},
   cr-category = {H.2.4 Database Management Systems,     H.2.8 Database Applications},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@inproceedings {INPROC-2008-111,
   author = {Matthias Wieland and Daniela Nicklas and Frank Leymann},
   title = {{Managing Technical Processes Using Smart Workflows}},
   booktitle = {Towards a Service-Based Internet, First European Conference, ServiceWave 2008, Madrid, Spain, December 10-13, 2008. Proceedings},
   editor = {Petri Maehoenen and Klaus Pohl and Thierry Priol},
   publisher = {Springer Verlag},
   institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Lecture Notes in Computer Science},
   volume = {5377},
   pages = {287--298},
   type = {Konferenz-Beitrag},
   month = {Dezember},
   year = {2008},
   isbn = {978-3-540-89896-2},
   language = {Englisch},
   cr-category = {H.4.1 Office Automation},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   abstract = {Technical processes that are crossing the boundary to the physical world can be found in many application domains, like logistics or in Smart Factory environments. We show how these processes can be realized by so-called Smart Workflows. To integrate external information sources like context provisioning services, we introduce the Integration Process architecture pattern. This pattern generally solves the problem of integrating different complex systems that provide functional similar services with non-fitting interfaces into workflows. The pattern allows that workflows use simple domain specific interfaces that are the same for any of these systems and by that allow the exchange of underlying systems without changing the workflows. This is accomplished by reducing the interface complexity of the systems via a hierarchical Web Service stack that reaches from the lowest technical granularity needed by IT experts to the domain specific granularity needed by the domain experts. Furthermore the paper presents a concrete realization of the pattern for integrating different context provisioning systems into workflows.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-111&engl=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {85--96},
   type = {Konferenz-Beitrag},
   month = {November},
   year = {2007},
   isbn = {978-85-17-00036-2},
   keywords = {nexus; cursor; federation; spatial},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {325--334},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2007},
   isbn = {978-3-87907-452-5},
   keywords = {Nexus; location-based services; Augmented Reality; Geographic Models; context-awareness},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {577--591},
   type = {Workshop-Beitrag},
   month = {Juni},
   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 = {Englisch},
   cr-category = {H.4.1 Office Automation},
   contact = {Matthias Wieland wielanms@informatik.uni-stuttgart.de},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {85--96},
   type = {Konferenz-Beitrag},
   month = {November},
   year = {2007},
   language = {Englisch},
   cr-category = {C.2.4 Distributed Systems,     H.2.4 Database Management Systems,     H.3.3 Information Search and Retrieval},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {35--52},
   type = {Konferenz-Beitrag},
   month = {November},
   year = {2006},
   isbn = {9 788517 000270},
   keywords = {Main Memory Query Engine, Indexing, Spatial Index, Type Hierarchies, Deployable Query Engine},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {32--35},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2006},
   isbn = {3-929619-39-3},
   keywords = {Umgebungsmodell; Framework; Kontext; Anwendung; Nexus},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {Januar},
   year = {2006},
   keywords = {nlp nexus context modeling and reasoning},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Lecture Notes in Informatics (LNI)},
   volume = {P-76},
   pages = {139--143},
   type = {Konferenz-Beitrag},
   month = {Februar},
   year = {2006},
   isbn = {3-88579-170-6},
   keywords = {Kontextbezogene Applikationen; Smart Factory; kontextbezogene Workflows},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Industrielle Fertigung und Fabrikbetrieb (IFF);     Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Informatik Bericht},
   volume = {324},
   pages = {12--15},
   type = {Konferenz-Beitrag},
   month = {Juni},
   year = {2005},
   keywords = {context models; smart environment; smart room; Nexus},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {April},
   year = {2005},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {Februar},
   year = {2005},
   keywords = {Autonomous; Robots; Sensor; Fusion; Nexus; Context; Sensorfusion},
   language = {Englisch},
   cr-category = {H.3.3 Information Search and Retrieval,     I.2.9 Robotics},
   contact = {kaeppeler@informatik.uni-stuttgart.de},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {M{\"a}rz},
   year = {2005},
   keywords = {meta data; context model; context-aware applications},
   language = {Englisch},
   cr-category = {H.2.1 Database Management Logical Design},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {M{\"a}rz},
   year = {2005},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {April},
   year = {2005},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {November},
   year = {2004},
   keywords = {Data integration, distributed query processing, federated database system, kNN, nearest neighbors, parallel query processing},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {167--181},
   type = {Konferenz-Beitrag},
   month = {November},
   year = {2004},
   isbn = {3-901882-20-0},
   keywords = {location-based services, context-awareness, mobile applications},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {122--127},
   type = {Konferenz-Beitrag},
   month = {August},
   year = {2004},
   keywords = {Nexus; information integration; domain-specific},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {48--53},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2004},
   isbn = {854328130},
   keywords = {Context-Models, Adaptation, Infrastructures for Context-Aware Computing, Ubiquitous Computing},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Informatik-Berichte der FernUniversit{\"a}t in Hagen},
   volume = {317},
   pages = {15--18},
   type = {Konferenz-Beitrag},
   month = {Juni},
   year = {2004},
   keywords = {Location-based Service; Context-aware System; Platform; Geocast},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Lecture Notes in Informatics},
   volume = {P-50},
   pages = {288--292},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2004},
   isbn = {3-88579-379-2},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {48--52},
   type = {Konferenz-Beitrag},
   month = {M{\"a}rz},
   year = {2004},
   keywords = {coordinate transformation, basic geometry types, spatial reference system, data integration, library for context-aware applications},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {297--306},
   type = {Konferenz-Beitrag},
   month = {M{\"a}rz},
   year = {2004},
   keywords = {context; context-awareness; pervasive computing; ubiquitous computing; world model; Nexus},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2003},
   keywords = {Umgebungsmodelle; kontext-bezogene Systeme; Nexus; Spatial World Models; context-aware systems},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {0--1},
   type = {Konferenz-Beitrag},
   month = {September},
   year = {2003},
   isbn = {0-12-722442-4},
   language = {Englisch},
   cr-category = {A.0 General Literature, General},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {61--67},
   type = {Konferenz-Beitrag},
   month = {November},
   year = {2001},
   isbn = {924-442-199-4},
   keywords = {Nexus; Location-based Services; Games; Augmented World Model; Nexus Applications},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   pages = {392--401},
   type = {Konferenz-Beitrag},
   month = {Januar},
   year = {2001},
   isbn = {1-85233-546-7},
   keywords = {Nexus; location-based services; location-aware; augmented world model},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
   series = {Lecture Notes in Computer Science},
   volume = {2121},
   pages = {117--135},
   type = {Konferenz-Beitrag},
   month = {Juli},
   year = {2001},
   isbn = {3-540-42301-X},
   keywords = {Mobile Computing; Location-Aware Applications; Augmented World Model},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware;     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=0}
}
@article {ART-2011-22,
   author = {Matthias Wieland and Daniela Nicklas and Frank Leymann},
   title = {{Benefits of Business Process Context for Human Task Management}},
   journal = {International Journal of Trade, Economics and Finance},
   editor = {International Association of Computer Science and Information Technology Press (IACSIT)},
   publisher = {IACSIT Publishing},
   volume = {2},
   number = {4},
   pages = {304--311},
   type = {Artikel in Zeitschrift},
   month = {August},
   year = {2011},
   isbn = {2010-023X},
   language = {Englisch},
   cr-category = {H.1.2 User/Machine Systems,     H.4.1 Office Automation},
   ee = {http://www.ijtef.org/papers/122-I00018.pdf},
   contact = {wieland@iaas.uni-stuttgart.de},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
   abstract = {Context-aware systems adapt their functionality and behavior to the user and his or her situation. To do so, they need context information about the user’s environment, e.g., about different kinds of real world objects. Many systems and data models are available for the management of context information. An often neglected but important part of context is the state and context of the applications that users are currently executing. This paper presents the benefits of using the context of workflow-based applications in the area of human task management. We show what kind of new task clients for mobile users are enabled by a context model for business process management and present an implementation of the system.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-22&engl=0}
}
@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 = {Artikel in Zeitschrift},
   month = {M{\"a}rz},
   year = {2011},
   isbn = {0306-4379},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {September},
   year = {2009},
   language = {Englisch},
   cr-category = {H.2.1 Database Management Logical Design,     H.2.8 Database Applications},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {Februar},
   year = {2009},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {M{\"a}rz},
   year = {2009},
   doi = {10.1524/itit.2009.0527},
   keywords = {ubiquitous Computing; pervasive Computing; context modeling; mobile applications; Content Analysis and indexing},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {Januar},
   year = {2006},
   doi = {10.1515/PIKO.2006.30},
   keywords = {ortsbezogene Dienste; Anwendungsentwicklung},
   language = {Deutsch},
   cr-category = {D.2.2 Software Engineering Design Tools and Techniques},
   contact = {Torben Weis torben.weis@informatik.uni-stuttgart.de},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {Juni},
   year = {2006},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Industrielle Fertigung und Fabrikbetrieb (IFF);     Universit{\"a}t Stuttgart, Institut f{\"u}r Visualisierung und Interaktive Systeme, Visualisierung und Interaktive Systeme;     Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp);     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme;     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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {Dezember},
   year = {2004},
   keywords = {Augmented World Model; Context-aware applications; Nexus; location-aware; infrastructure; open platform},
   language = {Englisch},
   cr-category = {H.2.1 Database Management Logical Design,     H.2.8 Database Applications},
   contact = {Daniela Nicklas danickla@informatik.uni-stuttgart.de},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {Oktober},
   year = {2002},
   keywords = {Mobile Computing; Augmented World Model; GDF; ATKIS},
   language = {Deutsch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware;     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=0}
}
@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 = {Artikel in Zeitschrift},
   month = {September},
   year = {2001},
   keywords = {Nexus, architecture, data model, location-based, federation, standard class schema, extended class schema},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware;     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=0}
}
@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 = {Beitrag in Buch},
   month = {Juni},
   year = {2005},
   isbn = {3-540-26295-4},
   keywords = {federation; context models; nexus; location-based services},
   language = {Englisch},
   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 = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
   series = {LNI},
   volume = {P265},
   pages = {637},
   type = {Tagungsband},
   month = {M{\"a}rz},
   year = {2017},
   isbn = {978-3-88579-659-6},
   language = {Englisch},
   cr-category = {H.4.1 Office Automation},
   ee = {http://dblp.org/db/conf/btw/btw2017.html},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;     Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme},
   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=0}
}
@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 = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
   pages = {232},
   type = {Tagungsband},
   month = {Mai},
   year = {2007},
   isbn = {1-4244-1240-4},
   keywords = {mobile data management},
   language = {Deutsch},
   cr-category = {E.2 Data Storage Representations,     H.2 Database Management},
   ee = {http://mdm2007.uni-mannheim.de/},
   department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
   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=0}
}