网格计算资源管理中的强约束信任评估模型

信任关系是实现网格资源共享的基础。文中提出了针对网格资源、资源提供者和资源消费者的信誉度评估模型，对信任进行了定义；并结合声誉评估方法，建立了信任评估流程，实现了一个具有强约束的信任评估模型。仿真实验表明，该模型达到了选择信任度更高的实体建立调用关系的目的，同时可促进资源交易量和系统的吞吐量。

Proposing a Stringent Trust Model to Replace Reputation Model for Resource Management in Grid Computing System

In the full paper we analyze the two principal shortcomings of reputation model:(1) reputation value is dependent on Grid Services Consumers's(GSC's) subjective judgment;(2) such judgment is obviously far from changing continuously with new developments.We aim to overcome these two shortcomings with our stringent trust model.Trust is the base of accessing,utilizing,and managing a variety of heterogeneous resources in virtual organizations across multiple domains and institutions.GSC's broker relies on reputation model or our stringent trust model to perform the following complex and difficult task: selecting the capability,the trustable resource and the Grid Service Provider(GSP) within a distributed Grid environment to satisfy service requirements.In the full paper,we describe in much detail the stringent trust model we propose;here we give only a briefing.We present a stringent trust model which includes the credit and reputation of resource,GSP and GSC.In the model,we bring forward the algorithm of credit and then integrate credit and reputation for the sake of trust,and define the process of evaluating.Finally we performed simulations to compare the performances of reputation model and our stringent trust model.We selected two levels of resource scheduling: 2000 tasks and 4000 tasks.Here we give only results for 2000 tasks;they were:(1) average time required for performing one task was(753.30 ms) for our model and 877.04 ms for reputation model respectively;(2) resource utilization was(88.21%) for our model and 83.36% for reputation model respectively.