网格环境中动态信任模型研究  

Research on dynamic trust model in grid environment

作　　者：张景安[1] 

机构地区：[1]山西大同大学数学与计算机科学学院,山西大同037009

出　　处：《计算机工程与设计》2009年第20期4606-4609,4613,共5页Computer Engineering and Design

基　　金：山西省教育厅高科技开发基金项目(20051256)

摘　　要：为了提高网格交互的安全性,客观地反映信任的主观性、模糊性及主体间信任关系的动态性,提出了基于模糊理论的动态信任管理方法。通过特征向量和隶属度等概念,实现了信任的动态描述。针对不同的上下文环境,结合推荐节点的直接交互经验,建立了信任的模糊综合评判模型并通过反模糊化,得出量化评估结果。基于时间衰减和模糊贴近度两因素,给出了信任更新模型。仿真实验分析表明,该方法对网格环境中的信任评估是可靠的、有效的。To improve security of grid interaction and reflect subjective and fuzzy nature of trust and dynamic character of trust relation, a method of dynamic trust management based on fuzzy theory is put forward. The membership degree and eigenvector of the fuzzy theory are firstly introduced to descript trust dynamically. On different context settings and direct interaction information of the recommendation node, the fuzzy synthesis evaluation model of trust is presented. By defuzzification of the trust degree, the quantitative results of evaluation are obtained. Based on two factors of time-attenuation and fuzzy approach degree, a new model of trust renewal is provided. Results of simulation showed that the proposed method of trust evaluation for grid is reliable and effective.

关 键 词：网格 信任模型 模糊理论 信任评估 信任更新 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]