基于约束的语义服务组合研究
发布时间：2019-01-06 06:08
【摘要】：随着Web服务的大量涌现，自动的Web服务组合成为使Web增值的研究热点。同时随着语义技术的不断发展，基于语义的Web服务组合成为主流研究方向。其中，基于服务网络的Web服务组合取得了显著成果，但是，基于服务网络的Web服务组合还存在着效率和准确率低的问题。 本文首先分析服务网络语义模型的三层结构：参数级语义关系、接口级语义关系、服务级语义关系。然后举例分析了基于服务网络的组合算法的准确率，发现Web服务参数语义关系缺乏上下文信息，导致基于服务网络的Web服务组合算法的准确率低。针对该问题，本文对Web服务参数进行扩展，，添加了4种参数约束，并定义了参数约束之间的匹配关系。在扩展服务网络的同时，本文还分析了组合需求模型的不足，并根据已扩展的服务网络，对组合需求模型进行了扩展，为原有的需求输入输出参数添加了上下文约束信息，约束种类对应于扩展后的服务网络。最后本文实现了基于扩展后的服务参数约束信息，利用扩展后的组合需求约束对服务网络语义边进行过滤的Web服务自动组合算法。实验表明，本文提出的基于约束的Web服务组合算法能够有效提高服务组合的效率和准确率。本文还使用HTML5、JS技术实现了组合结果的图形化展示。 综上所述，本文对服务网络、组合需求模型进行扩展，利用扩展后的约束信息，设计了一种基于约束的Web服务自动组合，提高了原有基于Web服务语义关系图的算法的效率和准确率。
[Abstract]:With the emergence of Web services, automatic Web service composition has become the research focus of Web value-added. At the same time, with the development of semantic technology, semantic-based Web service composition becomes the mainstream research direction. Among them, the Web service composition based on the service network has achieved remarkable results, but the Web service composition based on the service network still has the problem of low efficiency and accuracy. In this paper, we first analyze the three-layer structure of the semantic model of service network: parametric semantic relationship, interface semantic relationship and service-level semantic relationship. Then, an example is given to analyze the accuracy of the composition algorithm based on service network. It is found that the semantic relationship of Web service parameters lacks context information, which leads to the low accuracy of Web service composition algorithm based on service network. To solve this problem, this paper extends the parameters of Web service, adds four kinds of parameter constraints, and defines the matching relationship between them. At the same time of extending the service network, this paper also analyzes the shortcomings of the composition requirement model, and according to the extended service network, extends the composition requirement model, and adds the context constraint information for the original requirement input and output parameters. The types of constraints correspond to the extended service network. Finally, an automatic Web service composition algorithm is implemented based on the extended service parameter constraint information and the extended composition requirement constraint to filter the semantic edge of the service network. Experiments show that the constrained Web service composition algorithm can effectively improve the efficiency and accuracy of service composition. This paper also uses HTML5,JS technology to realize the graphical display of the combined results. To sum up, this paper extends the model of service network and composition requirements, and designs an automatic composition of Web services based on constraints by using the extended constraint information. The efficiency and accuracy of the original algorithm based on Web service semantic diagram are improved.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.09
本文编号：2402441
[Abstract]:With the emergence of Web services, automatic Web service composition has become the research focus of Web value-added. At the same time, with the development of semantic technology, semantic-based Web service composition becomes the mainstream research direction. Among them, the Web service composition based on the service network has achieved remarkable results, but the Web service composition based on the service network still has the problem of low efficiency and accuracy. In this paper, we first analyze the three-layer structure of the semantic model of service network: parametric semantic relationship, interface semantic relationship and service-level semantic relationship. Then, an example is given to analyze the accuracy of the composition algorithm based on service network. It is found that the semantic relationship of Web service parameters lacks context information, which leads to the low accuracy of Web service composition algorithm based on service network. To solve this problem, this paper extends the parameters of Web service, adds four kinds of parameter constraints, and defines the matching relationship between them. At the same time of extending the service network, this paper also analyzes the shortcomings of the composition requirement model, and according to the extended service network, extends the composition requirement model, and adds the context constraint information for the original requirement input and output parameters. The types of constraints correspond to the extended service network. Finally, an automatic Web service composition algorithm is implemented based on the extended service parameter constraint information and the extended composition requirement constraint to filter the semantic edge of the service network. Experiments show that the constrained Web service composition algorithm can effectively improve the efficiency and accuracy of service composition. This paper also uses HTML5,JS technology to realize the graphical display of the combined results. To sum up, this paper extends the model of service network and composition requirements, and designs an automatic composition of Web services based on constraints by using the extended constraint information. The efficiency and accuracy of the original algorithm based on Web service semantic diagram are improved.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.09
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本文编号：2402441
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