CAJ | 학술논문

如何精确地预测云服务的QoS，灵活地处理用户的QoS约束是实现可靠云服务推荐的关键问题。针对上述问题，提出了一种基于事例推理的云服务QoS动态预测方法，用于预测候选云服务的QoS值，提高云服务质量的可靠性；提出了一种基于约束层次（Constraint Hierarchy，CH）的QoS评价模型，该模型依据QoS约束对用户业务的重要程度，将其分为必须满足的硬约束层和允许被偏离的软约束层，该模型能够有效地解决过约束问题。通过实验验证了提出的云服务推荐方法的可行性和有效性。
여하정학지예측운복무적QoS，령활지처리용호적QoS약속시실현가고운복무추천적관건문제。침대상술문제，제출료일충기우사례추리적운복무QoS동태예측방법，용우예측후선운복무적QoS치，제고운복무질량적가고성；제출료일충기우약속층차（Constraint Hierarchy，CH）적QoS평개모형，해모형의거QoS약속대용호업무적중요정도，장기분위필수만족적경약속층화윤허피편리적연약속층，해모형능구유효지해결과약속문제。통과실험험증료제출적운복무추천방법적가행성화유효성。
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.