摘要
网格环境下如何为应用程序选择可靠的服务是一个关键问题.借鉴人类社会建立推荐信任模型的方法,提出以服务提供的服务质量属性为参考元素,引入基于服务质量的偏序关系建立基本可信度函数,考虑不同网格结点之间的历史交互信息中的不确定性,将历史交互信息转化为结点之间的推荐偏好意见,并采用衰减算子和融合算子综合来自不同网格结点的推荐信息.针对服务选择时产生的负载不均衡的现象,采用轮盘赌的方法进行服务选择.最后分析和仿真实验证明该模型的有效性.
In grid environment, grid nodes provide services with QoS guarantee, so how to choose a credible service is a critical problem. It is proposed that basic probability assignment be constructed based on the QoS constraints that the services provide, and that in the process of building the basic probability assignment, a partial relation is inducted in order to remove the worthless history information. And referring to the behavior of human society the reputation model of the grid nodes is established. Moreover, based on the discounting operator and the consensus cooperator, the reputation options from different grid nodes can be integrated. In order to avoid the overload in some nodes, a balancing scheme implemented with a biased roulette wheel is adopted. Simulation tests prove that the model can tackle the trust problem in a simple and efficient way.
出处
《计算机研究与发展》
EI
CSCD
北大核心
2007年第8期1365-1370,共6页
Journal of Computer Research and Development
