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提出基于粗糙集的关联影响的基本概念及其属性约简算法,利用属性之间的相互影响,建立属性的关联影响度矩阵,以属性的关联影响度作为启发条件,有效地删除冗余属性,获得能反映出属性之间相互影响的约简集.在分析和研究电网故障诊断系统属性选择的基础上,通过电工理论计算电网连锁故障诊断预警系统的属性值,求出负荷转移情况下属性之间相互产生的关联影响,建立基于关联影响属性约简算法的电网故障诊断和预警模型. 相似文献
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一种Web服务QoS可信性评价模型 总被引:2,自引:0,他引:2
随着Web服务数量的增加,根据Web服务的非功能属性(QoS)度量Web服务质量成为研究热点之一.目前对Web服务QoS的研究主要集中在QoS信息管理、QoS度量方法及基于QoS驱动的服务选取上,但对于QoS评价的可信性研究较少.本文在目前QoS研究的基础上提出一个Web服务QoS可信性评价模型,并给出了两种Web服务QoS可信性评价方法.最后,描述了可信性评价的实验过程及效率分析. 相似文献
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Circuit Emulation Service (CES) aims to enable packet switched networks to provide guaranteed services with comparable qualities of circuit switched networks. Our paper addresses the key issue of QoS of CES flows over Internet. Enlightened by the time division idea popularly used in circuit switched networks, we propose a time division based control mechanism to provide guaranteed QoS for the constant-rate CES flows. The control mechanism is able to estimate the arrival times of the coming packets in CES flows, and reserve the time slots for them. Accordingly, it enables the packets to consume the reserved time slots of their own, so the CES flows are guaranteed to be processed. Refreshing Bloom Filter (RBF), an efficient data representation structure, is proposed to support the time division control mechanism. It consists of multiple bloom filters, and can efficiently record the arrival time slots of millions of packets. The proposed control system model could be a practical tool to support Circuit Emulation Services over Internet. 相似文献
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With the rapid growth of powerful mobile devices, to improve the speed and quality of customer service, mobilizing their workforce became more and more important to many companies. Consequently, all kinds of enterprise applications, policies and data access are enabled through mobile platforms. However, how to manage such various mobile types and mobile applications and to integrate them with existing enterprise IT infrastructure becomes a great challenge. In this paper, we propose a novel approach to manage the enterprise mobiles through IT service management by using standard ITIL processes. Motivated by real cases of insurance industry mobile solution, firstly, a system architecture named BlueStar is designed which integrated ITIL-compliant mobile management and enterprise IT service management into a uniform platform. Secondly, typical ITIL processes and best practices: Change and configuration workflow are introduced for mobility management. Thirdly, the BlueStar system included device management component is implemented and evaluated by the motivating cases. 相似文献
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从标准看智能电网的发展 总被引:1,自引:0,他引:1
目前世界各国在什么是智能电网、如何推进智能电网的发展等方面并没有达成一致意见。美国设想的未来电力系统是一个完全自动化的电力传输网络,能够保证从电厂到终端用户整个输配电过程中所有节点之间的信息和电能的双向流动。欧洲智能电网技术平台的目标是提高输配电系统的效率、安全性和可靠性,消除大规模集成配网与可再生能源的障碍。日本将主要以大规模开发太阳能等新能源、确保电网系统稳定作为智能电网建设的主要思路。结合中国的实际情况,我国智能电网业务框架应包含发电、输变电、配电、用户、运行、服务提供者、电力市场及统一信息平台等8个领域。现有标准与智能电网之间存在差距,主要体现在需求响应和电力市场、广域状态测量、电力存储、电力传输、AMI系统、配网管理等6个方面。其中,一部分差距已经有了清晰的发展方向和解决思路;而另一部分的具体发展方向和解决思路尚不明确。智能电网相关标准的开发需要以具体项目实施为载体,标准体系是否完备需要通过具体项目检验和修订,同时具体项目的顺利实施也有赖于标准体系的约束和规范。针对中国某省级电网的特殊性和典型性,建议其智能电网的发展,一是应重点关注标准研究方向,二是由此引出的示范工程项目。 相似文献
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Internet上越来越多的应用都具有Web风格,Web本身正逐步成为Internet上各类应用的运行平台,这种现象可称为"Web平台化","Web平台化"为信息技术的发展带来机遇和挑战。文章立足于探讨"Web平台化"所面临的关键技术挑战之一,即Web管理。首先从Web的特征出发,总结其对Web管理的要求;其次提出将"管理服务化"作为Web管理的解决方案,并指出"管理服务化"面临的技术挑战;最后以PKUAS支持的面向服务的管理为例展示"管理服务化"的可行性。 相似文献