中文摘要：

在基于SOA（Service-Oriented Architecture）的软件中,为了适应用户对软件QoS（Quality of Service）值要求的改变或是组成软件的Web服务本身QoS值的不稳定,需要对软件进行重配置,使其QoS值达到用户要求。提出一个QoS驱动的动态替换算法,通过对软件的QoS的监测结果或用户所提出的QoS需求,确定动态替换目标。通过目标的替换,使配置后的软件满足用户需求。理论分析和实验结果都说明了算法的可行性和有效性。

英文摘要：

In SOA-based software,for such reasons as either coping with user requirement changes on software QoS value or instability of the QoS value of the web service itself that composes the software,it is necessary to reconfigure the software to enable its QoS value to satisfy user demands.The paper presents a QoS driven dynamic substitution algorithm.This algorithm bases on software QoS monitoring results or user suggested QoS requirements to determine dynamic substitution targets.By target substitution the reconfigured software tend to satisfy user requirements.Both theoretical analysis and experiment results have proven the feasibility and effectiveness of the algorithm.