一种基于网格服务的可靠性度量模型

A reliability measurement model for grid service

在网格中,服务资源通常是动态变化的.因此,如何度量服务的可靠性是网格中服务质量的一个关键问题.根据网格中服务动态变化的特点,从可靠性的角度对网格中的服务质量进行分析并给出相应的计算方法,从而提出一种基于网格服务的可靠性度量模型.该模型将动态变化的服务划分为一系列相对静态的时段,根据网格中服务的主动特性,对网格结点上所提供的服务进行可靠性分析,从服务的可靠性、可靠性的数学期望、可靠性的均方差3个方面综合度量网格中服务的可靠性.

A reliability measurement model for the service in grid is proposed based on the dynamic characteristic of service resource. In this model, the dynamic stage of service is divided into a series of relative stillness stages, and the difference of each relative stillness stage denotes a change of the service resource in the species or the number. The reliability of service, the mathematical expectation of reliability and the mean square deviation of reliability can be worked out by analyzing the service that are provided by the grid nodes. So the reliability quality of service can be determined in grid by using the reliability of service, the mathematical expectation of reliability and the mean square deviation of reliability.