The Research Of Web Service Selection Based On Uncertainty QoS

Web service has been a common concern by expert and scholar at home and abroad,because of its good cross-platform, loose coupling, interoperability, scalability, etc. Withthe deployment of Web service on the network increasing, a lot of services with thesame function appeared inevitably, and how to determine that the services are mostsuited to users’ needs became difficult. Therefore web service selection is a key part ofthe web service application process. This paper main studies the web service selectionbased on QoS.Currently, web service selection based on QoS only provide sevice selection resultsto user without providing any feedback information to service provider to improve theirservice. This paper presents the mechanism of service quality oriented service provider.The value of QoS attributes is relatively simple when calculating the QoS attributes andthe QoS attributes only represented as real type and QoS does not support interval typeand language type. The heterogeneous QoS model to service selection has become oneof the problems in the field of web service selection, and the heterogeneous QoS modelexpression by uncertainty data such as interval type and language type. This paperproposed a web service selection method based on uncertainty oriented mutliple users.The main contents of this paper as follows:(1)This paper introduces the background and significance of web service selection.Next analyzes the status of service selection technology research at home and abroad.Finally, gives the uncertainty QoS compute model of web service.(2)Existing web service selection based on QoS only focus on provide the resultsof service selection, but it could not provide feedback to the service provider. This paperpresents a mechanism of service quality feedback oriented to the service provider. Themechanism not only users can select their satisfaction service but also service providercould master the non-function attributes of their service is good or bad qualitatively.Service provider could improve their service according to this qualitative analsis.(3)In most studies, the non-function attributes QoS of web service is used innumeric types and the type structure relatively simple.This paper forward the method ofWeb service selection based on uncertain QoS, the uncertainty QoS attribute isexpressed as a real number, interval number and language type etc.In this paper,themethod for web service selection based on interval number QoS as possibility degree,completely retained the characteristics of interval number. In web serviceselection based on hybrid QoS, the type of language QoS was converted to triangularfuzzy number to retain its uncertain characteristics.Finally, the correctness andeffectiveness of the method is verified by an example and simulation experiment basedon WS-DREAM.(4)This paper also presents the service selection method based on history data ofmultiple users, respectively using interval-based QoS model and hybrid-based QoSmodel to select Web service. Considering multiple users’ QoS evaluation to select webservice and make the results of service selection more reliable.