Existing approaches for trust model often have inadequate support for the change of environment.In order to bridge this gap,a context ontology-based Web service dynamic trust computing model is proposed.This model awares the context of entities which affects the trust relationship, and transform them into different input values.In this model, the method of objective and subjective combination weighting and fuzzy comprehensive evaluation are adopted to evaluate the relationship of trust between the entities.The simulation compared with EigenTrust model,by changing time and the context of entities, result indicates the model is effective and feasible.%针对当前信任模型未能充分考虑环境因素在信任评估中的影响问题,提出了一种基于上下文本体的Web服务动态信任计算模型(CO-WTCM).该模型通过感知服务实体所处上下文信息,对这些动态、分布、异构的信息进行本体建模,在此基础上采用主客观组合赋权法和模糊综合评估算法对服务实体间的信任关系进行综合评估并通过信任度的综合计算实时更新实体间的信任关系,从而最大程度地保证实体行为的安全和可信.通过与EigenTrust模型相对比,仿真实验验证了该模型的可靠性和有效性.
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