智能交通系统网格资源的服务质量评价技术

QoS evaluation of distributed resources in ITSGrid

为了提高智能交通系统网格(ITSGrid)中的各类分布式资源的服务质量(quality of service,QoS),为ITSGrid使用者进行分布式资源选取与服务组合提供参考依据,结合ITSGrid的特点,对ITSGrid的分布式资源QoS参数进行分类整理,定义适用于ITSGrid的分布式资源QoS评价模型。该模型支持不同ITS应用类别QoS评价因子的动态定制,满足ITSGrid使用者对分布式资源QoS的个性化要求。基于该模型,构造ITSGrid中的分布式资源QoS评价的系统框架,在评价过程中引入信息过滤机制,依据经验知识对ITSGrid的作业运行时间进行自适应过滤。研究结果表明:所提出的模型及框架具有较高的资源选择准确率以及稳定性,可以为ITSGrid中的分布式资源选择高可信度提供参考,提高ITSGrid中的资源利用率和服务效率,从而促进ITSGrid整体性能的提高。

In order to improve the quality of service （QoS） of various distributed resources in intelligent transportation system grid （ITSGrid）, and to provide reference for distributed resource selection and service combination in ITSGrid, a distributed resources QoS evaluation model for ITSGrid was defined after the ITSGrid characteristics-oriented classification of QoS parameters. This model supports the dynamic customization of QoS evaluation factors for different types applications of ITS, and can satisfy users＇ personalized requirements on distributed resource QoS in ITSGrid. Based on this model, the system framework of this evaluation model was designed. In this framework, an adaptive filtering mechanism was introduced to filter information according to the experience and knowledge of ITS job runtime. The results show that the model and framework can reduce the overhead of distributed resources QoS evaluation time, curb the phenomenon of false or malicious evaluation in distributed resources QoS evaluation process, and increase resource utilization and service efficiency in ITSGrid, thereby improve overall performance of ITSGrid.