为增强服务网格中的用户QoS水平,文中针对由大量可用性不高的资源组成的网格环境,提出了可用性增强的作业执行服务（AJES）的概念及确定方法,基于该概念提出了可用性增强的作业执行模型（Availability-enhanced Model for Job Execution,AMJE）,通过将AJES中多个网格节点的资源分配给作业冗余执行,以增强其可用性.在AMJE中,不同参与方根据各自利益进行博弈,求得了折中的AJES可用性阈值.实验结果表明,文中提出的作业服务模型能显著提高资源收益,增强用户QoS的保障水平,且对于可用性动态变化的网格环境具有更好的适应性.

In order to improve the quality of service（QoS） in service grid environment,the concept of Availability-Enhanced Job Execution Service（AJES） and its constructing method are proposed for the grid environment consisting of a large amount of low-availability resources.Then,an availability-enhanced model for job execution（AMJE） is derived from AJES,which redundantly schedules the resources to one or more grid sites within AJES,thus enhancing the availability required for job execution.In AMJE,different participants on behalf of their profits are described as a game,and a balance threshold of AJES availability is obtained.Experimental results show that AMJE increases the revenue of resource providers,improves the QoS level for end users,and exhibits good adaptability to dynamic grid environment.