基于图的可信Web服务组合方法研究

发布时间：2018-04-17 11:09

本文选题：QoS + 声誉　；参考：《南京邮电大学》2014年硕士论文

【摘要】：电子商务应用的不断拓展，使跨物理空间、跨软硬件系统平台，实现在Internet环境下企业级应用间的协同共享与集成的需求日益凸显。正是因为具有松耦合、良好的封装性和跨平台特性， Web服务成为企业应用集成的有效解决方案。相应的，研究能够满足用户功能且可信的服务组合技术成为当前热点。服务组合问题首先要面临的就是对海量服务的选择，因此对候选服务的信任评价特别重要。如果响应时间较长会影响用户体验，，服务组合技术需要同时考虑组合结果的可信性及组合效率。本文运用语义Web、本体论、图论等相关领域的知识进行Web服务组合及其可信性的研究，相比较以往研究工作，本文的创新在于：首先，提出基于服务质量(QoS)和声誉的信任度评估模型，综合考虑服务提供商提供的QoS、用户对服务的历史评价、用户通过与服务交互和服务推荐获得的声誉以及服务提供商的可信性等方面进行建模，从整体及准确程度上对服务信任评估予以提升；其次，对模型的每个模块分别设计获取数据的方式及计算方法，进行组合服务的信任评估，以保证单个服务及组合服务的可信性；再次，基于图进行可信服务组合方法的设计，将语义信息引入服务描述文档WSDL，添加服务综合信任度，将WSDL转换为携带质量信息的OWL-S文档进行服务匹配，采用以服务信任为启发的双向图搜索算法获得最终组合路径，从而缩短了响应时间，保障了组合服务的可信性。最后，开发仿真平台，对本文提出的服务信任度评估模型、基于图的服务组合算法进行仿真，验证了模型及算法的可信性、高效性。
[Abstract]:With the continuous development of electronic commerce applications, the need of cross-physical space, cross-hardware and software system platform, and the realization of collaborative sharing and integration among enterprise applications in Internet environment is becoming increasingly prominent.Because of its loose coupling, good encapsulation and cross-platform characteristics, Web services become an effective solution for enterprise application integration.Accordingly, service composition technology, which can satisfy user's function and be trusted, has become a hot topic.The first problem of service composition is the choice of mass services, so it is very important to evaluate the trust of candidate services.If the response time is long enough to affect the user experience, the service composition technology needs to consider both the credibility of the composition results and the composition efficiency.This paper uses the knowledge of semantic Web, Ontology, Graph Theory and other related fields to study the composition of Web services and its credibility. Compared with the previous research work, the innovation of this paper is as follows: first of all,A trust evaluation model based on QoS (QoS) and reputation is proposed. Considering the QoS provided by the service provider, users' historical evaluation of the service is proposed.By modeling the reputation of service interaction and service recommendation and the credibility of service provider, users can improve the evaluation of service trust in terms of overall and accuracy. Secondly,Each module of the model is designed to obtain the data and the calculation method to evaluate the trust of the composite service to ensure the credibility of the single service and composite service. Thirdly, the trusted service composition method is designed based on the graph.The semantic information is introduced into the service description document (WSDL), the service synthesis trust is added, the WSDL is transformed into the OWL-S document with quality information for service matching, and the bidirectional graph search algorithm inspired by service trust is used to obtain the final composition path.Thus, the response time is shortened and the credibility of composite services is guaranteed.Finally, the simulation platform is developed to simulate the service trust evaluation model proposed in this paper and the graph-based service composition algorithm to verify the credibility and efficiency of the model and algorithm.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.09;O157.5

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