@inproceedings {INPROC-2017-54,
author = {Michael Hahn and Uwe Breitenb{\"u}cher and Frank Leymann and Andreas Wei{\ss}},
title = {{TraDE - A Transparent Data Exchange Middleware for Service Choreographies}},
booktitle = {On the Move to Meaningful Internet Systems. OTM 2017 Conferences: Confederated International Conferences: CoopIS, C\&TC, and ODBASE 2017, Rhodes, Greece, October 23-27, 2017, Proceedings, Part I},
editor = {Herv{\'e} Panetto and Christophe Debruyne and Walid Gaaloul and Mike Papazoglou and Adrian Paschke and Claudio Agostino Ardagna and Robert Meersman},
publisher = {Springer International Publishing},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science},
volume = {10573},
pages = {252--270},
type = {Conference Paper},
month = {October},
year = {2017},
isbn = {978-3-319-69462-7},
doi = {10.1007/978-3-319-69462-7_16},
keywords = {Service choreographies; Data-awareness; Cross-partner data flow; Transparent data exchange; BPM},
language = {English},
cr-category = {H.4.1 Office Automation,
C.2.4 Distributed Systems},
contact = {Michael Hahn: michael.hahn@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Due to recent advances in data science the importance of data is increasing
also in the domain of business process management. To reflect the paradigm
shift towards data-awareness in service compositions, in previous work, we
introduced the notion of data-aware choreographies through cross-partner data
objects and cross-partner data flows as means to increase run time flexibility
while reducing the complexity of modeling data flows in service choreographies.
In this paper, we focus on the required run time environment to execute such
data-aware choreographies through a new Transparent Data Exchange (TraDE)
Middleware. The contributions of this paper are a choreography
language-independent metamodel and an architecture for such a middleware.
Furthermore, we evaluated our concepts and TraDE Middleware prototype by
conducting a performance evaluation that compares our approach for
cross-partner data flows with the classical exchange of data within service
choreographies through messages. The evaluation results already show some
valuable performance improvements when applying our TraDE concepts.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-54&engl=1}
}
@inproceedings {INPROC-2017-53,
author = {Sebastian Wagner and Uwe Breitenb{\"u}cher and Oliver Kopp and Andreas Wei{\ss} and Frank Leymann},
title = {{Fostering the Reuse of TOSCA-based Applications by Merging BPEL Management Plans}},
booktitle = {Cloud Computing and Services Science: 6th International Conference (CLOSER 2016) - Revised Selected Papers},
publisher = {Springer International Publishing},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Communications in Computer and Information Science},
volume = {740},
pages = {232--254},
type = {Conference Paper},
month = {July},
year = {2017},
isbn = {978-3-319-62594-2},
doi = {10.1007/978-3-319-62594-2_12},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-53&engl=1}
}
@inproceedings {INPROC-2017-27,
author = {C. Timurhan Sungur and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann and Andreas Wei{\ss}},
title = {{Identifying Relevant Resources and Relevant Capabilities of Informal Processes}},
booktitle = {Proceedings of the 19th International Conference on Enterprise Information Systems (ICEIS 2017)},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {295--307},
type = {Conference Paper},
month = {April},
year = {2017},
keywords = {Informal Processes; Unstructured Processes; Resource Discovery; Capability Discovery; Relevant Resources; Relevant Capabilities},
language = {English},
cr-category = {H.4.1 Office Automation,
H.3.3 Information Search and Retrieval,
H.3.4 Information Storage and Retrieval Systems and Software,
H.5.3 Group and Organization Interfaces},
department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;
University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2017-27&engl=1}
}
@inproceedings {INPROC-2016-38,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Santiago G{\'o}mez S{\'a}ez and Michael Hahn and Dimka Karastoyanova},
title = {{ChorSystem: A Message-Based System for the Life Cycle Management of Choreographies}},
booktitle = {On the Move to Meaningful Internet Systems: OTM 2016 Conferences: Confederated International Conferences: CoopIS, C\&TC, and ODBASE 2016, Rhodes, Greece, October 24-28, 2016, Proceedings},
editor = {Christophe Debruyne and Herv{\'e} Panetto and Robert Meersman and Tharam Dillon and Eva K{\"u}hn and Declan O'Sullivan and Claudio Agostino Ardagna},
publisher = {Springer International Publishing},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {503--521},
type = {Conference Paper},
month = {October},
year = {2016},
doi = {10.1007/978-3-319-48472-3_30},
keywords = {Collaborative Dynamic Complex (CDC) Systems; Choreography Life Cycle Management; Flexible Choreographies},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2016-38/INPROC-2016-38.pdf},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service choreographies are commonly used as the means for enabling
inter-organizational collaboration by providing a global view on the message
exchange between involved participants. Choreographies are ideal for a number
of application domains that are classi ed under the Collaborative, Dynamic \&
Complex (CDC) systems area. System users in these application domains require
facilities to control the execution of a choreography instance such as
suspending, resuming or terminating, and thus actively control its life cycle.
We support this requirement by introducing the ChorSystem, a system capable of
managing the complete life cycle of choreographies from choreography modeling,
through deployment, to execution and monitoring. The performance evaluation of
the life cycle operations shows that the ChorSystem introduces an acceptable
performance overhead compared to purely script-based scenarios, while gaining
the abilities to control the choreography life cycle.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-38&engl=1}
}
@inproceedings {INPROC-2016-28,
author = {C. Timurhan Sungur and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann and Mozi Song and Andreas Wei{\ss} and Christoph Mayr-Dorn and Schahram Dustdar},
title = {{Identifying Relevant Resources and Relevant Capabilities of Collaborations - A Case Study}},
booktitle = {Proceedings of the 2016 IEEE 20th International Enterprise Distributed Object Computing Workshop (EDOCW)},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {352--355},
type = {Demonstration},
month = {September},
year = {2016},
keywords = {Organizational performance; resource discovery; capability discovery; relevant resources; relevant capabilities; informal processes; unstructured processes},
language = {English},
cr-category = {H.4.1 Office Automation,
H.3.3 Information Search and Retrieval,
H.3.4 Information Storage and Retrieval Systems and Software,
H.5.3 Group and Organization Interfaces},
department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;
University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Organizational processes involving collaborating resources, such as development
processes, innovation processes, and decision-making processes, typically
affect the performance of many organizations. Moreover, including required but
missing, resources and capabilities of collaborations can improve the
performance of corresponding processes drastically. In this work, we
demonstrate the extended Informal Process Execution (InProXec) method for
identifying resources and capabilities of collaborations using a case study on
the Apache jclouds project.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-28&engl=1}
}
@inproceedings {INPROC-2016-15,
author = {David Richard Sch{\"a}fer and Andreas Wei{\ss} and Muhammad Adnan Tariq and Vasilios Andrikopoulos and Santiago G{\'o}mez S{\'a}ez and Lukas Krawczyk and Kurt Rothermel},
title = {{HAWKS: A System for Highly Available Executions of Workflows}},
booktitle = {Proceedings of the 13th IEEE International Conference on Services Computing: SCC'16; San Francisco, California, USA, June 27-July 2, 2016},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {130--137},
type = {Conference Paper},
month = {June},
year = {2016},
doi = {10.1109/SCC.2016.24},
keywords = {SOA; workflows; availability; replication; performance},
language = {English},
cr-category = {C.2.4 Distributed Systems,
C.4 Performance of Systems},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2016-15/INPROC-2016-15.pdf,
http://dx.doi.org/10.1109/SCC.2016.24},
department = {University of Stuttgart, Institute of Architecture of Application Systems;
University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems},
abstract = {The workflow technology is the de facto standard for managing business
processes. Today, workflows are even used for automating interactions and
collaborations between business partners, e.g., for enabling just-in-time
production. Every workflow that is part of such a collaboration needs to be
highly available. Otherwise, the business operations, e.g., the production,
might be hindered or even stopped. Since today's business partners are
scattered across the globe, the workflows are executed in a highly distributed
and heterogeneous environment. Those environments are, however, failure-prone
and, thus, providing availability is not trivial. In this work, we improve
availability by replicating workflow executions, while ensuring that the
outcome is the same as in a non-replicated execution. For making workflow
replication easily usable with current workflow technology, we derive the
requirements for modeling a workflow replication system. Then, we propose the
HAWKS system, which adheres to the previously specified requirements and is
compatible with current technology. We implement a proof-of-concept in the
open-source workflow execution engine Apache ODE for demonstrating this
compatibility. Finally, we extensively evaluate the impact of using HAWKS in
terms of performance and availability in the presence of failures.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-15&engl=1}
}
@inproceedings {INPROC-2015-40,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova},
title = {{Rewinding and Repeating Scientific Choreographies}},
booktitle = {On the Move to Meaningful Internet Systems: OTM 2015 Conferences},
editor = {H. Panetto et al. C. Debruyne},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {337--347},
type = {Conference Paper},
month = {October},
year = {2015},
doi = {10.1007/978-3-319-26148-5_22},
keywords = {Ad Hoc changes; Choreography; Workflow; Flexibility},
language = {English},
cr-category = {C.2.4 Distributed Systems,
H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Scientists that use the workflow paradigm for the enactment of scientific
experiments need support for trial-and-error modeling, as well as flexibility
mechanisms that enable the ad hoc repetition of workflow logic for the
convergence of results or error handling. Towards this goal, in this paper we
introduce the facilities to repeat partially or completely running
choreographies on demand. Choreographies are interesting for the scientific
workflow community because so-called multi-scale/field (multi-*) experiments
can be modeled and enacted as choreographies of scientific workflows. A
prerequisite for choreography repetition is the rewinding of the involved
participant instances to a previous state. For this purpose, we define a formal
model representing choreography models and their instances as well as a concept
to repeat choreography logic. Furthermore, we provide an algorithm for
determining the rewinding points in each involved participant instance.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-40&engl=1}
}
@inproceedings {INPROC-2015-35,
author = {Santiago G{\'o}mez S{\'a}ez and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova and Andreas Wei{\ss}},
title = {{Enabling Reusable and Adaptive Modeling, Provisioning \& Execution of BPEL Processes}},
booktitle = {Proceedings of the 8th International Conference on Service-Oriented Computing and Applications (SOCA'15)},
address = {Rome, Italy},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {October},
year = {2015},
language = {English},
cr-category = {H.4.1 Office Automation,
C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures},
contact = {Santiago G{\'o}mez S{\'a}ez: gomez-saez@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The Business Process Execution Language (BPEL) is a well established language
for the definition of process models as service orchestrations. Service
orchestrations are used in conjunction with service choreographies in order to
create distributed, complex service-based applications. An important
requirement for such applications is the need for flexibility during both their
modeling and their execution. This work builds on this need by proposing an
extension of BPEL in order to allow the definition of abstract constructs on
the level of executable process models. Such constructs can be refined to
concrete activities at any time, enabling the reuse of existing models and the
dynamic adaptation to changing requirements. The design and implementation of
the language extension, as well as that of the supporting environment required
for the modeling, provisioning, and execution of such process models is further
discussed. A case study on a city-wide public transportation system offers the
means for an evaluation of the proposed approach.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-35&engl=1}
}
@inproceedings {INPROC-2015-18,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova},
title = {{Enabling the Extraction and Insertion of Reusable Choreography Fragments}},
booktitle = {Proceedings of the 22nd IEEE International Conference on Web Services},
address = {New York},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {686--694},
type = {Conference Paper},
month = {June},
year = {2015},
doi = {10.1109/ICWS.2015.96},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Reuse of service orchestrations or service compositions is extensively studied
in the literature of process modeling. Sub-processes, process templates,
process variants, and process reference models are employed as reusable
elements for these purposes. The concept of process fragments has been
previously introduced in order to capture parts of a process model and store
them for later reuse. However, similar efforts on facilitating the reuse of
processes that cross the boundaries of organizations expressed as service
choreographies are not available yet. In this paper, we introduce the concept
of choreography fragments as reusable elements for service choreography
modeling. Choreography fragments can be extracted from choreography models,
adapted, stored, and later inserted into new models. Based on a formal model
for choreography fragments, we define methods and algorithms for the extraction
and insertion of fragments from and into service choreographies. We then
discuss an experimental and proof-of-concept evaluation of our proposal.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-18&engl=1}
}
@inproceedings {INPROC-2015-07,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova},
title = {{Fostering Reuse in Choreography Modeling Through Choreography Fragments}},
booktitle = {Proceedings of the 17th International Conference on Enterprise Information Systems ICEIS 2015},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {28--36},
type = {Conference Paper},
month = {April},
year = {2015},
doi = {10.5220/0005342000280036},
keywords = {Choreography; Choreography Fragment; Choreography Fragment Pattern; Choreography Modeling; Reuse},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The concept of reuse in process models is extensively studied in the
literature. Sub-processes, process templates, process variants, and process
reference models are employed as reusable elements for process modeling.
Additionally, the notion of process fragments has been introduced to capture
parts of a process model and store them for later reuse. In contrast, concepts
for reuse of processes that cross the boundaries of organizations, i.e.,
choreographies, have not yet been studied in the appropriate level of detail.
In this paper, we introduce the concept of choreography fragments as reusable
elements for choreography modeling. Choreography fragments can be extracted
from choreography models, adapted, stored, and inserted into new models. We
provide a formal model for choreography fragments and identify a set of
patterns constituting frequently occurring meaningful choreography fragments.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-07&engl=1}
}
@inproceedings {INPROC-2014-60,
author = {Andreas Wei{\ss} and Santiago G{\'o}mez S{\'a}ez and Michael Hahn and Dimka Karastoyanova},
title = {{Approach and Refinement Strategies for Flexible Choreography Enactment}},
booktitle = {22nd International Conference on Cooperative Information Systems (CoopIS 2014)},
editor = {H. Panetto et al. R. Meersman},
publisher = {Springer Berlin Heidelberg},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {93--111},
type = {Conference Paper},
month = {October},
year = {2014},
doi = {10.1007/978-3-662-45563-0_6},
keywords = {Process Flexibility, Choreography Flexibility, Refinement Strategies, Late Modeling, Late Selection, Process Fragments},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Collaborative, Dynamic \& Complex (CDC) systems such as adaptive pervasive
systems, eScience applications, and complex business systems inherently require
modeling and run time exibility. Since domain problems in CDC systems are
expressed as service choreographies and enacted by service orchestrations, we
propose an approach introducing placeholder modeling constructs usable both on
the level of choreographies and orchestrations, and a classi cation of
strategies for their re nement to executable work ows. These abstract modeling
constructs allow deferring the modeling decisions to later points in the life
cycle of choreographies. This supports run time scenarios such as incorporating
new participants into a choreography after its enactment has started or
enhancing the process logic of some of the participants. We provide a
prototypical implementation of the approach and evaluate it by means of a case
study.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-60&engl=1}
}
@inproceedings {INPROC-2014-40,
author = {Andreas Wei{\ss} and Dimka Karastoyanova and David Molnar and Siegfried Schmauder},
title = {{Coupling of Existing Simulations using Bottom-up Modeling of Choreographies}},
booktitle = {Workshop on Simulation Technology: Systems for Data Intensive Simulations (SimTech\&\#64;GI) in Conjunction with INFORMATIK 2014},
publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {101--112},
type = {Workshop Paper},
month = {September},
year = {2014},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {As a contribution for eScience, we discuss the bottom-up derivation of
scientific choreography models from existing simulation workflows
interconnected as a multi-scale and multi-field simulation. Starting from a
motivating scenario of only implicitly coupled simulation workflows for the
studying of thermal aging of iron-copper alloys, we present a choreography life
cycle supporting the bottom-up derivation of choreography models and the
propagation of changes to the underlying simulation workflows in a round-trip
manner. Furthermore, we discuss several distinct starting points for the
derivation, namely explicitly and implicitly connected simulation workflow
models and already running simulation workflow instances.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-40&engl=1}
}
@inproceedings {INPROC-2014-39,
author = {Andreas Wei{\ss} and Dimka Karastoyanova},
title = {{A Life Cycle for Coupled Multi-Scale, Multi-Field Experiments Realized through Choreographies}},
booktitle = {Proceedings of the 18th IEEE International EDOC Conference (EDOC 2014)},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {234--241},
type = {Conference Paper},
month = {September},
year = {2014},
doi = {10.1109/EDOC.2014.39},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Current systems for enacting scientific experiments, and in particular
simulation workflows, do not support multi-scale and multi-field problems if
they are not coupled on the level of the mathematical model. We present a life
cycle that utilizes the notion of choreographies to enable the trial-and-error
modeling and execution of multi-scale and/or multi-field simulations. The life
cycle exhibits two views reflecting the characteristics of modeling and
execution in a top-down and bottom-up manner. It defines techniques for
composing data-intensive, scientific workflows in more complex simulations in a
generic, domain-independent way, and thus provides scientists with means for
collaborative and integrated data management based on the workflow paradigm.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-39&engl=1}
}
@inproceedings {INPROC-2014-08,
author = {Vasilios Andrikopoulos and Santiago G{\'o}mez S{\'a}ez and Dimka Karastoyanova and Andreas Wei{\ss}},
title = {{Collaborative, Dynamic \& Complex Systems: Modeling, Provision \& Execution}},
booktitle = {Proceedings of the Fourth International Conference on Cloud Computing and Service Science (CLOSER'14)},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {276--286},
type = {Conference Paper},
month = {April},
year = {2014},
language = {English},
cr-category = {D.2.0 Software Engineering General,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability},
contact = {Vasilios Andrikopoulos: andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service orientation has significantly facilitated the development of complex
distributed systems spanning multiple organizations. However, different
application areas approach such systems in domain-specific ways, focusing only
on particular aspects relevant for their application types. As a result, we
observe a very fragmented landscape of service-oriented systems, which does not
enable collaboration across organizations. To address this concern, in this
work we introduce the notion of Collaborative, Dynamic and Complex (CDC)
systems and position them with respect to existing technologies. In addition,
we present how CDC systems are modeled and the steps to provision and execute
them. Furthermore, we contribute an architecture and prototypical
implementation, which we evaluate by means of a case study in a Cloud-enabled
context-aware pervasive application.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-08&engl=1}
}
@inproceedings {INPROC-2013-55,
author = {Vasilios Andrikopoulos and Santiago G{\'o}mez S{\'a}ez and Dimka Karastoyanova and Andreas Wei{\ss}},
title = {{Towards Collaborative, Dynamic \& Complex Systems}},
booktitle = {Proceedings of the 6th International Conference on Service-Oriented Computing and Applications (SOCA'13)},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {IEEE Computer Society},
pages = {1--5},
type = {Conference Paper},
month = {December},
year = {2013},
keywords = {collaborative, dynamic \& complex systems; service orchestration \& choreography; pervasive computing; service networks; context-awareness},
language = {English},
cr-category = {D.2.0 Software Engineering General,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability},
contact = {vasilios.andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service orientation has significantly facilitated the development of complex
distributed systems spanning multiple organizations. However, different
application areas approach such systems in domain-specific ways, focusing on
particular aspects relevant only for their application types. As a result, we
observe a very fragmented landscape of service-oriented systems, which does not
enable collaboration across organizations. To address this concern, in this
work we introduce the notion of Collaborative, Dynamic and Complex (CDC)
systems and position them with respect to existing technologies. In addition,
we present how CDC systems are modeled and the steps to provision and execute
them. We also contribute an architecture enabling CDC Systems with full life
cycle coverage that allows for leveraging service-oriented and Cloud-related
technologies.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-55&engl=1}
}
@inproceedings {INPROC-2013-07,
author = {Tobias Binz and Uwe Breitenb{\"u}cher and Oliver Kopp and Frank Leymann and Andreas Wei{\ss}},
title = {{Improve Resource-Sharing through Functionality-Preserving Merge of Cloud Application Topologies}},
booktitle = {Proceedings of the 3rd International Conference on Cloud Computing and Service Science, CLOSER 2013, 8-10 May 2013, Aachen, Germany},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {May},
year = {2013},
keywords = {Application Topology; Merge; Resource Sharing; Multi-tenancy; Cloud Computing; TOSCA},
language = {English},
cr-category = {K.6 Management of Computing and Information Systems},
contact = {a href=``http://www.iaas.uni-stuttgart.de/institut/mitarbeiter/binz''Tobias Binz/ a},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Resource sharing is an important aspect how cost savings in cloud computing are
realized. This is especially important in multi-tenancy settings, where
different tenants share the same resource. This paper presents an approach to
merge two application topologies into one, while on the one hand preserving the
functionality of both applications and on the other hand enabling sharing of
similar components. Previous work has not addressed this due to the lack of
ways to describe topologies of composite applications in a decomposed, formal,
and machine-readable way. New standardization initiatives, such as TOSCA,
provide a way to describe application topologies, which are also portable and
manageable. We propose an approach, realization, and architecture enabling a
functionality-preserving merge of application topologies. To validate our
approach we prototypically implemented and applied it to merge a set of test
cases. All in all, the functional-preserving merge is a method to support the
optimization and migration of existing applications to the cloud, because it
increases resource sharing in the processed application topologies.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-07&engl=1}
}
@article {ART-2017-12,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova},
title = {{Model-as-you-go for Choreographies: Rewinding and Repeating Scientific Choreographies}},
journal = {IEEE Transactions on Services Computing},
publisher = {IEEE},
volume = {PP},
number = {99},
pages = {1--1},
type = {Article in Journal},
month = {July},
year = {2017},
doi = {10.1109/TSC.2017.2732988},
keywords = {Ad Hoc Changes; Choreography Re-execution and Iteration; Choreography Rewinding; Flexible Choreography; Multi-* Experiment; Workflow},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-2017-12/ART-2017-12.pdf},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Scientists are increasingly using the workflow technology as a means for
modeling and execution of scientific experiments. Despite being a very powerful
paradigm workflows still lack support for trial-and-error modeling, as well as
flexibility mechanisms that enable the ad hoc repetition of experiment logic to
enable, for example, the convergence of results or to handle errors. In this
respect, in our work on enabling multi-scale/field (multi-*) experiments using
choreographies of scientific workflows, we contribute a method comprising all
necessary steps to conduct the repetition of choreography logic across all
workflow instances participating in a multi-* experiment. To realize the
method, we contribute i) a formal model representing choreography models and
instances, including the re-execute and iterate operations for choreographies,
and based on it ii) algorithms for determining the rewinding points, i.e. the
activity instances where the rewinding has to stop and iii) enable the actual
rewinding to a previous execution state and repetition of the choreography. We
present the implementation of our approach in a message-based, service-oriented
system that allows scientists to model, control, and execute scientific
choreographies as well as perform the rewinding and repeating of choreography
logic. We also provide an evaluation of the performance of our approach.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2017-12&engl=1}
}
@article {ART-2014-10,
author = {Andreas Wei{\ss} and Dimka Karastoyanova},
title = {{Enabling coupled multi-scale, multi-field experiments through choreographies of data-driven scientific simulations}},
journal = {Computing},
publisher = {Springer Wien},
pages = {0--29},
type = {Article in Journal},
month = {October},
year = {2014},
doi = {10.1007/s00607-014-0432-7},
keywords = {Simulation workflow; Scientific workflow; Choreography; Multi-scale, Multi-field experiment; Data-driven scientific simulation},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Current systems for enacting scientific experiments, and simulation workflows
in particular, do not support multi-scale and multi-field problems if they are
not coupled on the level of the mathematical model. To address this deficiency,
we present an approach enabling the trial-and-error modeling and execution of
multi-scale and/or multi-field simulations in a top-down and bottom-up manner
which is based on the notion of choreographies. The approach defines techniques
for composing data-intensive, scientific workflows in more complex simulations
in a generic, domain-independent way and thus provides means for collaborative
and integrated data management using the workflow/process-based paradigm. We
contribute a life cycle definition of such simulations and present in detail
concepts and techniques that support all life cycle phases. Furthermore,
requirements on a respective software system and choreography language
supporting multi-scale and/or multi-field simulations are identified, and an
architecture and its realization are presented.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2014-10&engl=1}
}