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One of the most interesting challenges introduced by web services is the dynamic composability. In this paper, An A-G algorithm(a modified Genetic Algorithm)is proposed to solve QoS-aware service composition problem, which is based on Ant Colony Optimization(ACO)and Genetic Algorithm. Our approach aims at learning advantages of both algorithms and overcoming their shortcomings. Experimental results...
Web service composition is an important problem in web service based systems. It is about how to build a new value-added web service using existing web services. A web service may have many implementations, all of which have the same functionality, but may have different QoS values. Thus, a significant research problem in web service composition is how to select a web service implementation for each...
Based on service oriented infrastructures, there are many services that provide the same functionality but differ in quality parameters. An important issue for web services composition is how to select appreciates services from a set of alternatives with QoS features being considered. We define a Petri net model - WS_QPN to computer the QoS values of composite services. Since finding a solution for...
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