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模糊集下QoS感知的网格服务优选算法


□ 王 璿 孔令富

  摘 要:在面向服务的网格应用中,支持服务质量(QoS)的服务选择成为确保用户QoS需求的有效方法,QoS感知的服务选择以多个QoS参数为评价指标。考虑到服务需求描述中QoS参数的约束条件往往具有模糊性,定义了模糊目标的隶属函数,将服务选择问题转换为模糊集下的多目标规划问题,通过求解QoS参数之间的重要关系来缓解QoS需求间存在的矛盾性问题。最后提出了QoS感知的服务优选算法,对每个候选服务的整体服务质量进行排序,为用户选择合适的服务提供依据。

  关键词:网格; 服务选择; 服务质量; 模糊集; 多目标规划

  中图分类号:TP393.07 文献标志码:A

   文章编号:1001-3695(2008)07-2007-03

  

  QoSaware selection algorithm of grid services on fuzzy set

  WANG Xuana,KONG Lingfua,b

  (a.School of Information Science & Engineering,b.Office of President, Yanshan University, Qinhuangdao Hebei 066004, China)

  Abstract:The QoSaware service selection is an available method to ensure quality of service for users in serviceoriented grid application. It adopts several QoS parameters to evaluate the performance of service. During the process of service selection, the restrictive conditions of QoS usually are fuzzy. A subjection function of fuzzy targets was defined to solute this problem. The problem of service selection was translated into the multitargets programming problem on the fuzzy set. In order to release the contradictory between several QoS parameters, the weight relationship of them were calculated. According to the above parameters, a QoSaware service selection algorithm was proposed that took response time, cost, service global capability and service credit as performance metrics, and chosen the best service as target. 

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