中文摘要：

文章总结归纳了群体协作的研究现状及所面临的信任问题,分析了现有动态信任模型存在的不足,通过引入数据溯源理念,构建了群体协作环境下的动态信任模型,对模型的形式化定义进行了详细论述。针对动态信任评估参数和标准的差异性问题,设计了一种基于RDF语义的动态信任评估方案,并对实体之间的溯源信任度、行为信任度和推荐信任度进行了算法设计。

英文摘要：

This paper summarizes the research status and trust issues of group collaboration,and analyzes the deficiency of the existing dynamic trust model. By introducing the idea of data provenance,the paper constructs a dynamic trust model under the environment of group collaboration and discusses the formalized definition of the model. Aiming at the problem of the evaluation parameters and standards of dynamic trust evaluation,the paper designs a dynamic trust evaluation scheme based on RDF semantics,and designs the algorithms of the provenance trust degree,behavior trust degree and recommend trust degree between entities as well.