The Research Of Web Services Combined System Based On User Demand

As an effective way of business provides. Web services have attracted industrial and academic attention. However, a single Web service can provide limited functionality, people want to be able to customize, build the business to meet their needs. This can only obtain from the Web service combination. Web services as a kind of brand-new distributed computing model。Is an effective mechanism that Web services can be integrated. With the Web service technology solutions used in more and more widely applicable, making dynamic Web service composition as the core of service-oriented computing technology. Currently, many domestic and international academic and research institutions around the dynamic Web service composition to start research work, and achieved some results. However, Web service composition and many issues need further study. Mainly in the following areas:ⅰ) efficiency and rationality of the combination is not enough.The main reason is the previous service composition main basis for the service interface information, through information matching to form a service package. In a large number of existing Web services, when using such a combination, The service match's computation load is big, the efficiency is low. Only through the interface information to determine the combined scheme, will result in the absence of semantic information, and a combination of reasonable is not enough.ii) Diversity of user requirements. With the different areas of the different users, there is a diversity of the needs of users。Typically, the service composition system, the more concerned about the service composition mechanism。From the user point of view, the expression means there is a lack of user demand,and expressed problem is Widespread. Service instance is in accordance with pre-established template for the corresponding search which Lack of flexibility. In this mode, the business relies heavily on the development and maintenance professionals. This method of business development can not adapt to rapidly changes in demand。Therefore, for deployment in the Internet environment, the Web service, we need to construct the user demands, user needs as the main basis for service composition, Can be generated directly from the business or user needs to adapt to changing business needs of users develop ways to meet the diversity of user requirements and the distributed nature of Web service itself. ⅲ) QoS properties of service composition evaluation system is not perfect. How to choose the right service from the service candidate portfolio which corresponding to function nodes existence b the problem of service evaluation. Evaluation of service need to consider the service QoS information, Those which reflect characteristics of the field attribute lack of expression and evaluation mechanisms.Aiming at solving the above problems, This article has done the key research to the above question。Use of ontology, graph theory, fuzzy mathematics and other disciplines related to knowledge and methods to seek solutions to these problems. The main work and achievements are as follows:①full access to the needs of users and enhance the rational combinationFirstly,the paper puts forward establishment of a domain service ontology. Then, the different Web service instance corresponding to the appropriate service concept. This course of service options, narrowing the scope of search services。According to the service ontology semantic relations existing between the concept of using semantic reasoning mechanism to obtain the user's needs and the corresponding user needs thinning, Make Web serve combination being able to take consumer need as centre, Make service combination can have one kind of much better mechanism in the field of satisfied consumer need; Analysis of the Semantic Web services in the service properties of semantic associations, Based on the attribute semantic associations puts forward services selection algorithm, This feasible Web service the combination scheme in validity, correctness aspect has had much better guarantee。In addition.have proposed Web Services Composition Method Based On Functionalattributes Semantics.through the establishment of Data links graph, behavior graph, to achieve automatic composition of services. Thus narrowing the scope of participation in services compostion and improve the efficiency and effectiveness.②QoS semantic modeling and evaluation of Web servicesProposed that expands the QoS attribute in for the conventional attribute and the domain attribute, According to the service concept attribute value gaining,consumer's need will get fairly good reporting, will takes this as the scheme calculating a basis, reaching the service combination example satisfying the consumer need and in serving choice ultimately。Proposed QoS attribute evaluation value calculation need to consider the credibility of the property value issue and how to credit the value of property included in the final evaluation value of QoS attributes are discussed, Improve the score by malicious, false assessment of service evaluation caused distortion③Prototype system framework designDesign a Prototype system named UDSWSCS, This system take the user's needs as a core, Considering the acquiring requirement and refinement,Ontology Reasoning,Semantic Annotation,QoS attribute evaluation value calculation,Ontology Management Ontology evolution and other factors, Has a high degree of automation and good extensibility features。...