Provisioning Resilient, Adaptive Web Services-based Workflow: A Semantic Modeling Approach
ICWS '04 Proceedings of the IEEE International Conference on Web Services
QoS computation and policing in dynamic web service selection
Proceedings of the 13th international World Wide Web conference on Alternate track papers & posters
QoS Aggregation for Web Service Composition using Workflow Patterns
EDOC '04 Proceedings of the Enterprise Distributed Object Computing Conference, Eighth IEEE International
An approach for quality of service adaptation in service-oriented Grids: Research Articles
Concurrency and Computation: Practice & Experience - Middleware for Grid Computing
Asynchronous aggregation and consistency in distributed constraint satisfaction
Artificial Intelligence - Special issue: Distributed constraint satisfaction
Service-Oriented Computing ICSOC 2005: Third International Conference, Amsterdam, The Netherlands, December 12-15, 2005, Proceedings (Lecture Notes in Computer Science)
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Web services technology is prevailing for business-to- business integration due to its well defined infrastructure enabling interoperability among heterogeneous applications. However, this interoperability promise also poses a difficulty in building a Web service management framework which can work across organizational boundaries. In this paper, we argue that existing Web service management systems are inflexible in the way they handle QoS violations of a composite service.We suggest to use an intermediate step, called QoS conflict mediation, to make existing Web service management systems more flexible. Our mediation approach is based on a combination of two new ideas. Firstly, we propose to use techniques from the AI field of Distributed Constraint Satisfaction to intelligently mediate any QoS conflicts between services in compositions involving multiple service providers. Secondly, we propose a novel monitoring system, based on cryptography, to verify the conformance of service providers to the specification of a selected DisCSP algorithm - the Asysnchronous Aggregate Search (AAS). This enables our DisCSP based QoS mediation to be used in the real Web services environment where full collaboration between providers may not always be guaranteed.