基于风险的云计算环境用户效用分析

通过分析云计算环境中资源分配和用户任务请求的过程，提出了云计算环境中的用户效用函数，并引入风险对云计算服务和资源由于被非授权访问造成的损失进行量化，得出了基于风险的用户期望效用函数.最后，通过仿真实验论证了任务执行数与用户需求，时间，费用和用户效用之间的关系.从仿真实验可以看出，用户的一次提交的任务数存在一个理想值，在这个理想值附近，其用户效用最好.

Analysis of User Utility in Cloud Computing Environment Based on Risk

Through the process of resource distribution and user request, this paper proposed a user utility function for tasks in the cloud computing environment. In this model, the risk is invoked to quantize the loss of the services and resources in the un- authorization access. Based on risk, this paper proposed a user expected utility function. Finally, the simulation experiment demonstrates the relation among the tasks quantity and the users'' request, time, and cost. Through the experiment, a perfect value exists for the task quantity, and near this perfect value, the users'' utility can be optimized.