中文摘要：

针对服务计算模型中对应用的可信特性支持不足问题,提出面向QoS保障的虚拟可信服务VTS,并依据VTS设计了一种基于反馈控制的自适应QoS保障机制。首先将VTS的QoS保障转换为反馈控制问题,给出一种自适应QoS保障框架,再在此框架下对VTS的QoS维护过程和策略进行建模,设计和实现了相应的动态组建、调节算法和实时评估策略。最后通过仿真实验的结果分析表明,该保障机制能够有效地增强VTS对服务实体运行时的QoS保障能力。

英文摘要：

Currently, service computing paradigm lacks the support of Trustworthiness. This paper proposed a new methodology virtual trustworthy service （VTS） to guarantee the QoS of service. Firstly, presented an adaptive feedback control framework based on VTS to guarantee the QoS of service. Secondly, under this VTS based QoS guarantee framework, made several QoS maintain schemes： dynamic establishment algorithm, real-time assessment algorithm and dynamic adjustment algorithm. Finally through analysis of the simulation experiment, the results demonstrate that the VTS based adaptive QoS guarantee Framework can effectively guarantee the QoS of service, and provide run-time QoS guarantee support.