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Issue No. 03 - May/June (2011 vol. 37)
ISSN: 0098-5589
pp: 387-409
Radu Calinescu , Aston University, Birmingham
Lars Grunske , Swinburne University of Technology, Swinburne
Marta Kwiatkowska , Oxford University Computing Laboratories, Oxford
Raffaela Mirandola , Politecnico di Milano, Milano
Giordano Tamburrelli , Politecnico di Milano, Milano
Service-based systems that are dynamically composed at runtime to provide complex, adaptive functionality are currently one of the main development paradigms in software engineering. However, the Quality of Service (QoS) delivered by these systems remains an important concern, and needs to be managed in an equally adaptive and predictable way. To address this need, we introduce a novel, tool-supported framework for the development of adaptive service-based systems called QoSMOS (QoS Management and Optimization of Service-based systems). QoSMOS can be used to develop service-based systems that achieve their QoS requirements through dynamically adapting to changes in the system state, environment, and workload. QoSMOS service-based systems translate high-level QoS requirements specified by their administrators into probabilistic temporal logic formulae, which are then formally and automatically analyzed to identify and enforce optimal system configurations. The QoSMOS self-adaptation mechanism can handle reliability and performance-related QoS requirements, and can be integrated into newly developed solutions or legacy systems. The effectiveness and scalability of the approach are validated using simulations and a set of experiments based on an implementation of an adaptive service-based system for remote medical assistance.
Service-oriented software engineering, QoS management, QoS optimization, adaptive systems.

L. Grunske, R. Mirandola, G. Tamburrelli, R. Calinescu and M. Kwiatkowska, "Dynamic QoS Management and Optimization in Service-Based Systems," in IEEE Transactions on Software Engineering, vol. 37, no. , pp. 387-409, 2010.
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