关键词: 云计算, 云服务推荐, QoS动态预测, 约束层次

Abstract: How to accurately predict cloud service QoS and flexibly describe and handle QoS constraints are key problems of realizing reliable cloud service recommendation. For these two problems, this paper firstly provides a QoS prediction method based on case-based reasoning, and use this method to predict the QoS values of the candidate cloud services, so as to improve the reliability of cloud services recommendation; A QoS evaluation model based on Constraint Hierarchy is proposed, which divides the QoS constraints into hard constraints that must be met and soft constraining layers that allowed to be deviated according to the importance of QoS constraints for users, this model can effectively solve the over-constrained problem. The experimental results demonstrate that the proposed cloud services recommendation method is feasible and effective.

Key words: colud computing, cloud service recommendation, QoS dynamic prediction, constraint hierarchy