| To realize the dynamical composition of VOs on requirements and evolve themselves by autonomic service cooperation is a potential excellent approach for developing assembled service-oriented application software systems in Internet computing environment. However, this approach is encountering the "trust" crisis of cooperation effects which is brought on from individual behavior difficult to predict and control. In order to solve the crisis, this paper proposes the model of norm-governed and policy-driven autonomic service cooperation, called NGPD. On the basis of this model, propose service scheduling and contract implementation of trusted VO. The model of NGPD can break through the limitation brought on from non-autonomic service cooperation, hence makes the self-determination and change-response ability of service cooperation exhibit the dominance of robustness and intelligence which can not be reached by traditional service cooperation techniques. Policy-based service scheduling overcomes the shortcomings of the existing service scheduling. At the same time, it makes service operation work in the form of component; bring plug-and-play of convenience. Though developing contract agreement, which is application-oriented domain, make contract of express become simple and standardized. It overcome the difficulty, existing contrace is not easy to express. Norm, in contract agreement, is actived according to circumstance at that time; it makes contract execution tend towards autonomy and automation, overcome the shortcoming, existing contrace is not easy to execute. |
