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一种基于移动计算环境的因果日志卷回恢复算法   总被引:2,自引:0,他引:2  
由于移动节点的不可靠和无线网络连接的脆弱性,研究移动计算系统容错机制具有重要意义.对可以跨区移动、随时可以与网络断开的自治性很强的移动节点来说,异步的卷回恢复是一种重要的容错手段.现有的移动计算环境下的卷回恢复算法都无法完全实现一致的异步卷回恢复.基于因果消息日志,提出一种新的移动计算环境的卷回恢复算法:通过先行图来记录节点间的消息依赖关系,将异步检查点、基于发送方的暂存消息日志和先行图全部在移动支持站上存储和处理,为移动节点提供一种透明的容错服务,完全消除依赖关系在移动节点之间造成的影响.用形式化的方法证明了系统的一致性.仿真结果表明,在卷回开销达到最低的同时,也显著降低了无错运行时的通信和存储开销.  相似文献
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This paper describes the modelling approach for the sales of gasoline in service stations located in a Portuguese metropolitan area. The models were developed for planning purposes in order to assess potential sales of new sites. The estimates produced are more accurate than those made by previous models and are currently being used to support investment decisions of the largest Portuguese company. Starting from a basic multiplicative regression model, several segmentations of the service stations were obtained. Among these, the submodels for service stations located in urban areas and for service stations located along routes produced a better fit. The models reflect, without exception, the importance of the variables representing the size of service station and the "traffic" passing by, as well as variables which express location and road type. The fast growth experienced by this market explains the lesser impact on sales of the area sales potential and of competition.  相似文献
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胡诚  汪芸  王辉 《软件学报》2016,27(1):72-95
传感器网络作为当代信息获取的重要手段之一,受到各国各界的广泛关注.在传感器网络中,能量问题一直是限制其广泛应用的重要约束和挑战.由于无线充电技术和智能移动节点的发展,使得综合使用这两种技术能够彻底解决传感器网络中的能量问题.这类采用无线充电方案的传感器网络称为无线可充电传感器网络.其中,充电规划影响无线可充电传感器网络在解决能量问题时的成本和效果,因此成为研究的热点.综述了最近几年无线可充电传感器网络研究中充电规划设计,从软、硬件层面的6个不同维度对这些方案进行分类概述和对比分析,总结在不同应用场景下进行充电规划设计的一般性思路,并通过3个实例进行演示,验证该设计思路的易用性和实用性.  相似文献
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This article proposes a procedure to construct membership functions of the system characteristics of a repairable system with one primary machine, one standby machine and an unreliable service station. Failure and repair times of both the operating and standby machines are assumed to follow fuzzified exponential distributions. In addition, the failure and repair times of the service station also follow fuzzified exponential distributions. The α-cut approach is used to extract a family of conventional crisp intervals for the desired system characteristics from the fuzzy repairable system, determined with a set of parametric nonlinear programs using their membership functions. A numerical example successfully illustrates the practicality of the proposed approach. Because system characteristics are governed by the membership functions, more information is provided for use by designers and practitioners. The successful extension of the parameter spaces to fuzzy environments permits the repairable system to have wider practical applications.  相似文献
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针对高海拔景区安全监测与管理问题,提出了基于物联网的旅游安全监测信息服务站架构,建立了信息服务主站和分站,由景区安全信息服务中心主站和游客位置、地质灾害、视频监控等信息服务分站组成。主站将分站现场实时获取的地质灾害信息、游客位置信息和视频图像存储在本地服务器或经由3G传输到指挥中心,实现为应急救援机构、旅行社与计划出行的游客等提供预警信息服务。  相似文献
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