为了解决开放、动态网络环境下的服务可信组合问题,特别是组合服务的可信度计算与评估,以及服务可信组合最优方案选择,提出一种服务质量(QoS)可信的按需服务组合方法.该方法根据单个服务的信任度值以及服务组合图的控制结构,构建基于QoS可信的服务组合信任模型,进行服务组合的信任合成与计算；基于该模型设计多约束条件下QoS可信的按需服务组合方案,采用粒子群算法进行优化求解,以此选择出可信度高的服务执行计划.面向物流领域配送管理需求实例进行了实证和实验研究,结果表明所提方法在求解多约束的可信服务组合优化上是有效、适用的,能够提高服务组合的可信性和成功率.%An on-demand service composition method based on reliable service quality is proposed to solve the service credible composition problem in open and dynamic network environment, especially the calculation and evaluation of the composite service credibility, and the optimal selection for credible service composition. The method bases on the trust value of a single service instance and the control structure of service composition diagram to build a service composition trust model based on credible quality of service, and to perform the calculation and synthesization of composition service credibility. Then, the model is used to design on-demand service composition plan with credible QoS under multiple constraints, and the particle swarm algorithm, is used to solve the optimization problem to obtain the service execution plan with the highest credibility. Experiments with an example of distribution management requirement of logistics domain show that the proposed method is effective and applicable to solve the constrained credible service composition optimization problem and can enhance the credibility and success rate of service composition.
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