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《Journal of Zhejiang University(Engineering Science)》 2012-01
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Quality optimizing real-time scheduling for incremental context services

YANG Zhao-hui1,LI Shan-ping1,LIN Xin1,2(1.College of Computer Science and Technology,Zhejiang University,Hangzhou 310027,China;2.Department of Computer Science and Technology,East China Normal University,Shanghai 200241,China)  
A two phase task model was proposed in order to achieve optimal user experience for an incremental context service under resource constraints and with context timeliness requirements.The model divides each job of an incremental service into a primary part that provide the initial service and a optional part that provide the improvements.A corresponding two level scheduling theme was designed to utilize the model.Several scheduling algorithms were designed to execute the primary parts in a timely manner and the optional parts in a value maximizing manner by analyzing the schedulability of the primary parts and the value generation pattern of the optional parts.Simulation results show that all the three primary part scheduling algorithms can meet context timeliness requirements under resource constraints.The performances of the optional part scheduling algorithm were compared when using different value prediction methods.Results show that the simpler delta value method can achieve performance close to that of the fit curve method,and is more suitable for practical use.
【Fund】: 国家自然科学基金资助项目(60773180 60903169);; 上海市信息安全综合管理技术研究重点实验室开放课题资助项目(AGK2008004)
【CateGory Index】: TP393.09
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Chinese Journal Full-text Database 1 Hits
1 Lin Xin Li Shan-ping Yang Zhao-hui(College of computer science,Zhejiang University,Hangzhou 310027,China);Freshness-Aware Real-Time Scheduling Algorithm for Context Reasoning[J];Journal of Electronics & Information Technology;2009-05
【Secondary Citations】
Chinese Journal Full-text Database 1 Hits
1 Li Rui and Li Renfa(School of Computers & Communications, Hunan University, Changsha 410082);A Survey of Context-Aware Computing and Its System Infrastructure[J];Journal of Computer Research and Development;2007-02
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