为了合理、高效、动态地评估Web服务组合的可靠性,为服务请求者提供高质量的组合服务,提出了一个Web服务组合的可靠性动态评估模型.该模型对服务提供者发布至UDDI注册中心的Web服务进行语义预先处理,根据语义Web服务间的逻辑组合关系,基于预推理技术构造Web服务的自动组合框架,提出了Web服务的自动组合算法,建立Web服务组合方案的路径结构；利用随机Petri网对满足服务请求者需求的服务组合路径结构进行可靠性建模,结合在线获取的Web服务可靠性信息,对Web服务组合的可靠性进行动态评估.实验示例结果分析表明,提出的模型能确保Web服务组合方案的有效性和提高服务组合的效率,对Web服务组合的可靠性评估具有较强动态性和灵活适应性.%To evaluate the reliability of Web service composition logically, efficiently and dynamically, and afford a high quality composite service for service applicant, this paper proposed a reliability dynamic evaluation model of Web services composition. The model foreclosed the semantic to the Web services of UDDI(universal description, discovery and integration) register center which issued by the services providers. According to the logic of the combination between semantic Web services relationship, basing on the reasoning technology to construct an automatic combination frame, this paper put forward an automatic combination algorithm, and set up the path structures of Web service composite schemes. And it then established the reliability models for the service composite path structures which satisfied the requirement of services applicants by stochastic Petri net, evaluated the reliability of Web services composition dynamically combining the online reliability information of Web services. The experiment results indicate that the model can insure the validity of the Web service composite schemes and enhance the efficiency of services composition, and evaluate the reliability of Web services composition with strong dynamic and flexible adaptability.
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