| Author | Title | Year | Journal/Proceedings | Reftype | DOI/URL |
|---|---|---|---|---|---|
| Geihs, K., Evers, C., Reichle, R., Wagner, M. & Khan, M. U. | Development Support for QoS-Aware Service-Adaptation in Ubiquitous Computing Applications [BibTeX] |
2011 | Proceedings of the ACM Symposium on Applied Computing (SAC) | inproceedings | |
BibTeX:
@inproceedings{KGCERRMWMUK10,
author = {Geihs, Kurt and Evers, Christoph and Reichle, Roland and Wagner, Michael and Khan, Mohammad Ullah},
title = {Development Support for QoS-Aware Service-Adaptation in Ubiquitous Computing Applications},
booktitle = {Proceedings of the ACM Symposium on Applied Computing (SAC)},
year = {2011}
}
|
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| Comes, D., Baraki, H., Reichle, R., Zapf, M. & Geihs, K. | Heuristic Approaches for QoS-based Service Selection [BibTeX] |
2010 | 8th International Conference on Service Oriented Computing (ICSOC) | inproceedings | URL |
BibTeX:
@inproceedings{CBRZG10,
author = {Comes, Diana and Baraki, Harun and Reichle, Roland and Zapf, Michael and Geihs, Kurt},
title = {Heuristic Approaches for QoS-based Service Selection},
booktitle = {8th International Conference on Service Oriented Computing (ICSOC)},
publisher = {Springer},
year = {2010},
url = {http://www.vs.uni-kassel.de/publications/2010/CBRZG10}
}
|
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| Comes, D., Zapf, M. & Geihs, K. | QoS-based Self-Management for Business Processes [BibTeX] |
2010 | Proceedings of the SAKS 2010 workshop | inproceedings | URL |
BibTeX:
@inproceedings{CZG10,
author = {Comes, Diana and Zapf, Michael and Geihs, Kurt},
title = {QoS-based Self-Management for Business Processes},
booktitle = {Proceedings of the SAKS 2010 workshop},
publisher = {Electronic Communications of the EASST},
year = {2010},
note = {ISSN 1863-2122},
url = {http://www.vs.uni-kassel.de/publications/2010/CZG10}
}
|
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| Geihs, K., Bleul, S. & Comes, D. | Automatische Dienstvermittlung in dienstorientierten Architekturen in Aktion [BibTeX] |
2010 | techreport | URL | |
BibTeX:
@techreport{GBC10,
author = {Geihs, Kurt and Bleul, Steffen and Comes, Diana},
title = {Automatische Dienstvermittlung in dienstorientierten Architekturen in Aktion},
year = {2010},
note = {http://kobra.bibliothek.uni-kassel.de/bitstream/urn:nbn:de:hebis:34-2010042732714/3/Technicalreport2010_1.pdf},
url = {http://www.vs.uni-kassel.de/publications/2010/GBC10}
}
|
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| Khan, M. U. | Unanticipated Dynamic Adaptation of Mobile Applications | 2010 | School: University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group | phdthesis | URL |
| Abstract: Driven by the emergence of mobile and ubiquitous computing there is a growing demand for context-aware applications that can dynamically adapt to their runtime environment. Middleware support for providing such adaptation to mobile applications has been an attractive research and development issue for several years now. However, one of the major challenges to support adaptation is that they can not be always foreseen during the design time. In a ubiquitous computing environment, a number of mobile devices running adaptive applications supported by the instances of the same middleware may come and go in a particular adaptation domain in an unanticipated manner. Moreover, third party services may also appear and disappear with respect to that particular adaptation domain. In componentbased application architectures, with the enhancement of integrating services, mobile applications may benefit from using the components that are provided by other users as well as using third party services. At runtime the application is composed of the components and the services available within the adaptation domain. This thesis provides an approach, including theoretical background, an adaptation middleware, an MDA-based application development methodology and a tool chain, in order to solve such unanticipated adaptation problems. | |||||
BibTeX:
@phdthesis{Khan2010,
author = {Khan, Mohammad Ullah},
title = {Unanticipated Dynamic Adaptation of Mobile Applications},
school = {University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group},
year = {2010},
url = {http://www.upress.uni-kassel.de/publi/abstract.php?978-3-89958-918-4}
}
|
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| Reichle, R. | Information Exchange and Fusion in Dynamic and Heterogeneous Distributed Environments | 2010 | School: University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group | phdthesis | URL |
| Abstract: Context awareness, dynamic reconfiguration at runtime and heterogeneity are key characteristics of future distributed systems, particularly in ubiquitous and mobile computing scenarios. The main contributions of this dissertation are theoretical as well as architectural concepts facilitating information exchange and fusion in heterogeneous and dynamic distributed environments. Our main focus is on bridging the heterogeneity issues and, at the same time, considering uncertain, imprecise and unreliable sensor information in information fusion and reasoning approaches. A domain ontology is used to establish a common vocabulary for the exchanged information. We thereby explicitly support different representations for the same kind of information and provide Inter-Representation Operations that convert between them. Special account is taken of the conversion of associated meta-data that express uncertainty and impreciseness. The Unscented Transformation, for example, is applied to propagate Gaussian normal distributions across highly non-linear Inter-Representation Operations. Uncertain sensor information is fused using the Dempster-Shafer Theory of Evidence as it allows explicit modelling of partial and complete ignorance. We also show how to incorporate the Dempster-Shafer Theory of Evidence into probabilistic reasoning schemes such as Hidden Markov Models in order to be able to consider the uncertainty of sensor information when deriving high-level information from low-level data. For all these concepts we provide architectural support as a guideline for developers of innovative information exchange and fusion infrastructures that are particularly targeted at heterogeneous dynamic environments. Two case studies serve as proof of concept. The first case study focuses on heterogeneous autonomous robots that have to spontaneously form a cooperative team in order to achieve a common goal. The second case study is concerned with an approach for user activity recognition which serves as baseline for a context-aware adaptive application. Both case studies demonstrate the viability and strengths of the proposed solution and emphasize that the Dempster-Shafer Theory of Evidence should be preferred to pure probability theory in applications involving non-linear Inter-Representation Operations. | |||||
BibTeX:
@phdthesis{Reichle2010,
author = {Reichle, Roland},
title = {Information Exchange and Fusion in Dynamic and Heterogeneous Distributed Environments},
school = {University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group},
year = {2010},
url = {http://kobra.bibliothek.uni-kassel.de/handle/urn:nbn:de:hebis:34-2010121035166}
}
|
|||||
| Skubch, H., Wagner, M., Reichle, R., Triller, S. & Geihs, K. | Towards a Comprehensive Teamwork Model for Highly Dynamic Domains [BibTeX] |
2010 | Proceedings of the 2nd International Conference on Agents and Artificial Intelligence | inproceedings | |
BibTeX:
@inproceedings{Skubch2010Alica,
author = {Skubch, Hendrik and Wagner, Michael and Reichle, Roland and Triller, Stefan and Geihs, Kurt},
title = {Towards a Comprehensive Teamwork Model for Highly Dynamic Domains},
booktitle = {Proceedings of the 2nd International Conference on Agents and Artificial Intelligence},
year = {2010}
}
|
|||||
| Comes, D., Bleul, S., Weise, T. & Geihs, K. | A Flexible Approach for Business Processes Monitoring | 2009 | Proceedings of the International Symposium (on) Distributed Computing Techniques (DisCoTec), 9th IFIP international conference on Distributed Applications and Interoperable Systems, DAIS 2009 | inproceedings | DOIURL |
| Abstract: Business processes and their implementation as Web Service Compositions
are not only dependent on Web Services and partners all over the Internet, but also on their failsafe execution. Service providers have to obligate their services to perform according to negotiated Quality of Service (QoS) parameters. For example, response time and throughput are important parameters to achieve fast and efficient services. Overloaded or failing services may compromise the reliability and execution of whole enterprise processes.\ \ In this paper we introduce a flexible monitoring approach for the measurement of QoS in BPEL (Business Process Execution Language) processes. We propose a generic algorithm for QoS aggregation in BPEL processes. The novel generic aggregation algorithm applies customized aggregation functions for QoS dimensions. Furthermore, we present a BPEL monitoring system which supports ad-hoc sensor deployment and efficient runtime and offline data aggregation not only for whole process descriptions but also sections inside service processes. |
|||||
BibTeX:
@inproceedings{CBTG2009AFAFBPM,
author = {Comes, Diana and Bleul, Steffen and Weise, Thomas and Geihs, Kurt},
title = {A Flexible Approach for Business Processes Monitoring},
booktitle = {Proceedings of the International Symposium (on) Distributed Computing Techniques (DisCoTec), 9th IFIP international conference on Distributed Applications and Interoperable Systems, DAIS 2009},
publisher = {Springer Verlag},
year = {2009},
volume = {5523/2009},
pages = {116--128},
url = {http://www.it-weise.de/documents/files/CBTG2009AFAFBPM.pdf},
doi = {http://dx.doi.org/10.1007/978-3-642-02164-0}
}
|
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| Schmid, M. | Autonomes Performance-Management in dienstorientierten Architekturen | 2009 | School: University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group | phdthesis | URL |
| Abstract: Die Bedeutung des Dienstgüte-Managements (SLM) im Bereich von Unternehmensanwendungen steigt mit der zunehmenden Kritikalität von IT-gestützten Prozessen für den Erfolg einzelner Unternehmen. Traditionell werden zur Implementierung eines wirksamen SLMs Monitoringprozesse in hierarchischen Managementumgebungen etabliert, die einen Administrator bei der notwendigen Rekonfiguration von Systemen unterstützen. Auf aktuelle, hochdynamische Softwarearchitekturen sind diese hierarchischen Ansätze jedoch nur sehr eingeschränkt anwendbar. Ein Beispiel dafür sind dienstorientierte Architekturen (SOA), bei denen die Geschäftsfunktionalität durch das Zusammenspiel einzelner, voneinander unabhängiger Dienste auf Basis deskriptiver Workflow-Beschreibungen modelliert wird. Dadurch ergibt sich eine hohe Laufzeitdynamik der gesamten Architektur. Für das SLM ist insbesondere die dezentrale Struktur einer SOA mit unterschiedlichen administrativen Zuständigkeiten für einzelne Teilsysteme problematisch, da regelnde Eingriffe zum einen durch die Kapselung der Implementierung einzelner Dienste und zum anderen durch das Fehlen einer zentralen Kontrollinstanz nur sehr eingeschränkt möglich sind. Die vorliegende Arbeit definiert die Architektur eines SLM-Systems für SOA-Umgebungen, in dem autonome Management-Komponenten kooperieren, um übergeordnete Dienstgüteziele zu erfüllen: Mithilfe von Selbst-Management-Technologien wird zunächst eine Automatisierung des Dienstgüte-Managements auf Ebene einzelner Dienste erreicht. Die autonomen Management-Komponenten dieser Dienste können dann mithilfe von Selbstorganisationsmechanismen übergreifende Ziele zur Optimierung von Dienstgüteverhalten und Ressourcennutzung verfolgen. Für das SLM auf Ebene von SOA Workflows müssen temporär dienstübergreifende Kooperationen zur Erfüllung von Dienstgüteanforderungen etabliert werden, die sich damit auch über mehrere administrative Domänen erstrecken können. Eine solche zeitlich begrenzte Kooperation autonomer Teilsysteme kann sinnvoll nur dezentral erfolgen, da die jeweiligen Kooperationspartner im Vorfeld nicht bekannt sind und – je nach Lebensdauer einzelner Workflows – zur Laufzeit beteiligte Komponenten ausgetauscht werden können. In der Arbeit wird ein Verfahren zur Koordination autonomer Management-Komponenten mit dem Ziel der Optimierung von Antwortzeiten auf Workflow-Ebene entwickelt: Management-Komponenten können durch Übertragung von Antwortzeitanteilen untereinander ihre individuellen Ziele straffen oder lockern, ohne dass das Gesamtantwortzeitziel dadurch verändert wird. Die Übertragung von Antwortzeitanteilen wird mithilfe eines Auktionsverfahrens realisiert. Technische Grundlage der Kooperation bildet ein Gruppenkommunikationsmechanismus. Weiterhin werden in Bezug auf die Nutzung geteilter, virtualisierter Ressourcen konkurrierende Dienste entsprechend geschäftlicher Ziele priorisiert. Im Rahmen der praktischen Umsetzung wird die Realisierung zentraler Architekturelemente und der entwickelten Verfahren zur Selbstorganisation beispielhaft für das SLM konkreter Komponenten vorgestellt. Zur Untersuchung der Management-Kooperation in größeren Szenarien wird ein hybrider Simulationsansatz verwendet. Im Rahmen der Evaluation werden Untersuchungen zur Skalierbarkeit des Ansatzes durchgeführt. Schwerpunkt ist hierbei die Betrachtung eines Systems aus kooperierenden Management-Komponenten, insbesondere im Hinblick auf den Kommunikationsaufwand. Die Evaluation zeigt, dass ein dienstübergreifendes, autonomes Performance-Management in SOA-Umgebungen möglich ist. Die Ergebnisse legen nahe, dass der entwickelte Ansatz auch in großen Umgebungen erfolgreich angewendet werden kann. | |||||
BibTeX:
@phdthesis{Schmid2009,
author = {Schmid, Markus},
title = {Autonomes Performance-Management in dienstorientierten Architekturen},
school = {University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group},
year = {2009},
url = {https://kobra.bibliothek.uni-kassel.de/handle/urn:nbn:de:hebis:34-2009122131562}
}
|
|||||
| Skubch, H., Wagner, M. & Reichle, R. | A Language for Interactive Cooperative Agents | 2009 | techreport | URL | |
| Abstract: Cooperative behaviour of agents within highly dynamic and nondeterministic domains is an active field of research. In particular establishing highly responsive teamwork, where agents are able to react on dynamic changes in the environment while facing unreliable communication and sensory noise, is an open problem. Moreover, modelling such responsive, cooperative behaviour is difficult. In this work, we specify a novel model for cooperative behaviour geared towards highly dynamic domains. In our approach, agents estimate each other’s decision and correct these estimations once they receive contradictory information. We aim at a comprehensive approach for agent teamwork featuring intuitive modelling capabilities for multi-agent activities, abstractions over activities and agents, and a clear operational semantic for the new model. This work encompasses a complete specification of the new language, ALICA. | |||||
BibTeX:
@techreport{Skubch2009,
author = {Skubch, Hendrik and Wagner, Michael and Reichle, Roland},
title = {A Language for Interactive Cooperative Agents},
year = {2009},
url = {http://kobra.bibliothek.uni-kassel.de/handle/urn:nbn:de:hebis:34-2009032026745}
}
|
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