Adaptive adjustion method of component service based on trust evaluation

To keep up with the dynamic open and isomerous environment of pervasive computing, a method which applies the trust evaluation and adaption technologies into the dynamic adjustment of component services is raised. In this method and to combine with the pervasive computing features firstly, the service credibility can be measured by reliability, availability, timeliness and integrity. The calculation methods are given for both direct and recommended credibility. The model of integrating trust evaluation is built for component services. Secondly an adaptive control logic based on the policy library is adopted to realize the adaptive control mechanism for the component service adjustment under the constraint of limited resources. The adaptive mechanism ensures the QoS. Besides, the system architecture of the control logic is also designed. Finally through the simulation study, it´s shown that the adaptive adjustment method of component services based on the trust evaluation is valid.