中文摘要：

依据信任的认知特征，分析了信任2个维度对角色信任的不同贡献，给出了服务信任和推荐信任的定义和量化公式．在信任网络中，分析了信任预测的3种情况及其社会网络特征，以代理的服务信誉为核心，设计了具有直接信任和传递信任的不同信任预测方案．设计方案中综合考虑了交互次数、交互时间、角色信誉、服务信任和推荐信任对信任预测的影响．最后的实验验证了角色信任的量化差异以及信任预测方法的有效性．

英文摘要：

Trust network is a social network and is constructed by trust relationships between agents. Dif- ferent contributions devoted by two dimensions of trust are analyzed, and definitions of service trust and recommendation trust are given. The social characteristics of the trust network is studied and a trust pre- diction method based on agent＇ s role-based trust and reputation is proposed. The influences of interac- tions number, time, reputation, service trust and recommendation trust are comprehensively considered which concord with the cognitive semantics of trust computing and propagation in trust network. The ex- periment verifies the differences of the role-based trust values and the effectiveness of trust prediction.