Qos-based Service Model And Research

Web services are new forms of Internet software that can be universally deployed and invoked using standard protocol. Services from different providers can be integrated to provide composite services. Competition between service providers is more and more austere along with web services technology change with each passing day. Usually, many different services which belong to the same type can all satisfy the customers' requirement, but these services have different qualities. At the same time, because of the restriction of internet conditions, web services quality are always uncertain, and the description for the services supplied by web services' providers may be different from the reality, what' s more serious is the fraudulence. So we need establish a QoS evaluating mechanism to get the quality. Meanwhile, for a composite service, web service should based on quality of every single service, under a restriction, highest the quality of the composite service.The research background of this paper is IPVita - an intelligent travel platform. There are many services correlate with traveling, including booking airplane tickets, hostel, and renting taxi, etc. Users need an integrated service; single services are useless for them. What' s customers need is an integrated satisfying traveling flow. Under the semantics' supporting, IPVita formalize customer' s requirement, thembuild composite traveling flow and match services automatically. The main work and contribution include:1. Taking the traveling flow for example, analysis the QoS questions of web services, including compositing web services from the QoS point of view and construe the respond time of web service.2. A model of selecting web service is proposed. In order to modeling the web service selecting question, abstract the web service questions...