【作者】 陈楠；

【导师】 李建华；

【作者基本信息】 中南大学 ， 计算机科学与技术， 2010， 硕士

【摘要】 随着Web服务技术的发展,越来越多的服务提供方以Web服务形式提供服务,当单个简单Web服务无法满足需求时,需要组合多个Web服务来完成,在组合过程中如何高效准确组合现有服务成为了当前研究热点。Web服务组合研究涉及多个问题,Web服务描述、Web服务组合方式和Web服务选择等。本文在现有研究的基础上,结合语义Web服务技术,研究如何根据服务需求动态组合Web服务。本文在传统基于图的服务组合方法中融合语义Web服务技术,提出一种新的语义Web服务组合方法。该组合方法分为三个步骤,利用领域本体技术形式化描述服务需求,结合形式化描述自动生成服务请求输入到请求输出的服务参数依赖图,根据服务参数依赖图推导出服务组合关系图。由于语义信息加入,本方法相比以往类似研究,提高了服务组合正确率,同时本方法能够处理服务请求多输入和多输出情况,提高了服务组合成功率。在语义Web服务组合过程中,针对现有语义参数匹配规则划分等级简单的问题,结合的语义Web领域概念相似度计算的思想,提出一种基于语义相似度计算服务接口匹配度量方法,该方法通过计算服务请求参数和接口参数相似度来解决服务接口选择问题,提高了服务选择的合理性。本文的工作针对目前Web服务组合技术中两个关键问题提出了有效的解决方案,对于推进Web服务组合技术的理论研究和应用具有一定价值。更多还原

【Abstract】 With the development of Web service technology, more and more service providers provide service in the form of Web service. When a single Web service can not meet the requirement, multiple services should be composed to fulfill it. How to realize efficient and accurate service composition is the hotspot now. Web service composition involves many questions, such as Web service description, the method of Web service composition and selection of Web service. Based on former research and semantic Web service technology, research on dynamic Web service composition is carried out.By introducing semantic Web service into traditional graph based service composition, a novel semantic Web service composition method is proposed. It includes three steps. First, describing service requirement in formal language using Ontology. Second, generating parameter dependence diagram from inputs to outputs using the formal discription of service requirement. Third, inducing composition relation graph using the parameter dependence diagram. With the semantic information, our method has a high accuracy and success rate as it can handle multiple inputs and outputs situation. In solution to the problem of inaccurate matching degree of semantic parameters, an interface matching method is proposed based on the idea of conception similarity. Similarity of service request parameters and interface parameters are calculated to solve the service selection problem and improve selection rationality in this method.Effective solutions for two major problems in Web service composition, which have certain meaning for promoting research and utilization on Web service composition are proposed in this paper.更多还原