CAJ | 학술논문

互联网环境的开放性、自治性和动态性给基于互联网的资源共享与应用集成带来了新的挑战.在组合服务运行过程中服务质量保证和可靠性等研究方面,服务冗余技术、流程重构技术是非常重要的容错手段,但是目前尚存在着容错开销过大、难以满足实时性要求以及流程重构策略缺乏可行性等问题.服务容错技术是保证组合服务QoS和带来额外开销(代价)的一个权衡.在分析冗余技术、流程重构可能带来的高额容错代价后,提出用于减少容错代价的组合服务拆分原则,遵循该原则有助于组合服务设计者选择合适的组件服务粒度并降低服务间的耦合度.模拟实验表明,提出的方法有助于提高组合服务的可靠性并降低失效容错代价.
호련망배경적개방성、자치성화동태성급기우호련망적자원공향여응용집성대래료신적도전.재조합복무운행과정중복무질량보증화가고성등연구방면,복무용여기술、류정중구기술시비상중요적용착수단,단시목전상존재착용착개소과대、난이만족실시성요구이급류정중구책략결핍가행성등문제.복무용착기술시보증조합복무QoS화대래액외개소(대개)적일개권형.재분석용여기술、류정중구가능대래적고액용착대개후,제출용우감소용착대개적조합복무탁분원칙,준순해원칙유조우조합복무설계자선택합괄적조건복무립도병강저복무간적우합도.모의실험표명,제출적방법유조우제고조합복무적가고성병강저실효용착대개.
The characteristics of Internet such as open,autonomy and dynamic impose new challenges on share and composition over interact resources.Meanwhile,researchs on runtime QoS-guarantee of Web service composition,service redundant technology and replanning are very important fault-tolerant methods.But they are facing severe problems on high-cost,requirement of real-time and infeasibility of replanning strategy.Fault tolerance is a trade-off between QoSguarantee and extra-overhead.In order to reduce the fault-tolerant cost,several decomposed principias were presented based on analyise of high-cost brought by fault-tolerant technology.According to these principias,it is helpful for the designer to select the proper service granularity and reduce the degree of coupling of services.Simulation results indicate that the mechanism is effective to increase the reliability of composite services and reduce the fault-tolerant cost.