论文部分内容阅读
针对传统信任模型存在权重设置主观性强、易受恶意推荐攻击、无法有效保障Web服务稳定性等缺陷,结合Web服务的网络环境特征,将服务质量的概念嵌入信任计算过程中,利用模糊认知图方法、DS证据理论,构建了面向Web服务的FCMDS信任模型.首先基于模糊认知图,提出了直接信任、间接信任度量方法,设计了信任路径局部搜索算法,推导了推荐信任路径合并过程;然后利用DS证据规则,提出了基于DS的综合信任计算方法.最后的仿真实验表明模型有效、可行,克服了恶意推荐、摇摆节点的影响,提升了信任计算效率,提高了Web服务质量.
Aiming at the defects that the traditional trust model has such disadvantages as subjectivity of weight setting, vulnerability to malicious recommendation attacks and failure to effectively guarantee the stability of Web services, the concept of service quality is embedded in the process of trust calculation based on the network environment characteristics of Web services. Graph method and DS evidence theory, a trust model of FCMDS for Web services is constructed.Firstly, based on fuzzy cognitive graph, a direct trust and indirect trust measurement method is proposed, and a local search algorithm of trust path is designed, and the process of merging recommended trust paths is deduced. Then, based on the DS evidence rules, a comprehensive trust computing method based on DS is proposed.Finally, the simulation results show that the model is effective and feasible, overcomes the influence of malicious recommendation and swing nodes, improves the trust computing efficiency and improves the quality of Web services.