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In global Web services selection, it involves to multi-objectives optimization and tradeoffs of diversified QoS criteria, therefore a suitable genetic algorithm is proposed to tackle the service selection problem. Since the QoS criteria are not always explicit and usually containing of fuzzy element, So this paper focuses on the relation between constraint(More)
The evaluation for Web Services is essential to select Web services from many candidates, but current evaluation models evaluate Web services only by common service attributes, which can not meet the requirements of end users. We propose an evaluation model for Web Services, which customizes reasonable attributes in different domains as evaluation factors,(More)
Web service substitutability refers to identify a suitable service to replace the failed service in Web service composition (WSC) and make sure the new WSC can still run correctly. Because of lack of data types, pi-calculus canpsilat verify the consistency of data types during the substitution processes. In this paper, we extend pi-calculus with a type(More)
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