Selection Of Semantic Web Services Based On Qos

With the wide application of information technology and the the rapid development of Internet, Web services resources on the network has drastically increased. When the servcice resources are limited, the service selection algorithm based on functional matching can be accurate.However, when there are many services with the same function,the algorithm has been unable to meet the application demand. Because of lack of semantic description and match, the accurate rate and comprehensive rate of the existing algorithm based QoS(Quality of Service) are very low. Most of the selection algorithm can only simply compute the QoS numaric information and can not consider the individual QoS requirement of User,and therefore can not select service the QoS of which matchs the QoS demand of user. Applying the ontology and semantic technology in the QoS information, this article disucsses the QoS semantic matching based on ontology module,numaric matching, service selection and other selection problems.ln the end,this article verify the model and algorithm using simulation and experiments.The main results and achievements are the following four.This paper discusses the strengths and weaknesses of existing QoS model,and then propose the ontology OWL-S-QoS Model which combines the ontology technolgoy with the semantic technology in the QoS information.The model can support single value,fuzzy single value,interregional area value and semantic QoS information.This supporting functions provide the bais for semantic matching,semantic selection and heterogeneous parameters matching.This paper discusses the strengths and weaknesses of the existing algothrim for functional matchmaking and proposes a new ontology model based on OWL-S-QoS. This model can make matching from both semantic and numaric point, the model therefore improves the accuracy of matchmaking.This paper discusses the existing service selection algorithm and proposes a new selection algorithm based on the service matching from OWL-S-QoS model.The algorithm can match the QoS of service with the demand of users,then computing the QoS vaule coming the weight given by user,select the first services which can satisfy the users with the most degree.In the end,this paper verify the model and algorithm with experiment and test,the result shows that the model is possible and the algorithm is advantageous.