摘要
针对目前网格环境下信任评估模型普遍存在未充分考虑信任关系的模糊性、信任信息的描述不完整等问题,提出了信任云的概念及其模型。该模型可从网格实体间相互协作满意度中提取信任信息,能精确描述信任期望值。通过熵和超熵刻画信任的不确定性,使评估过程更贴近于信任的语意特点。还提出了一种信任云的相似性度量方法和信任决策算法,实验表明了由信任云表述的信任关系可以作为网格环境下安全决策的依据。
In general, present trust evaluation models in grid environment fail to adequately consider the fuzzy characteristic of trust relation efficiency, and the description of trust by these models lacks comprehensiveness. To solve these problems, trust cloud concept and a trust evaluation model based on it were proposed. In this model, trust information was picked up through entities ＂satisfaction degree of collaboration in the grid, so it could accurately describe trust expectation value. The uncertainty was portrayed through entropy and hyper entropy in this model, which made the evaluation process more consistent with trust semantic meaning. Algorithms of cloud similarity measurement and decision-making method through trust cloud were proposed Experiment proves that the trust relation described by trust cloud can be used as foundation for decision-making on security in grid environment.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2009年第2期421-426,共6页
Journal of System Simulation
基金
江苏省自然科学基金(BK200656)
关键词
网格
信任关系
信任评估
云模型
grid
trust relation
trust evaluation
cloud model
