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面向SDN数据中心网络的路径资源管理节能机制研究 被引量:7
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作者 张沪寅 汪思思 +1 位作者 钱龙 周天瑛 《小型微型计算机系统》 CSCD 北大核心 2017年第4期755-760,共6页
随着数据中心规模的不断扩大,能耗问题已经成为制约其发展的瓶颈之一.因此,数据中心网络节能成为研究领域的一个重要方向,也产生了很多的研究成果.其中相当一部分方法是从寻找最小能耗路径入手,却往往陷入NPC或NP难问题的窘境.为了避免... 随着数据中心规模的不断扩大,能耗问题已经成为制约其发展的瓶颈之一.因此,数据中心网络节能成为研究领域的一个重要方向,也产生了很多的研究成果.其中相当一部分方法是从寻找最小能耗路径入手,却往往陷入NPC或NP难问题的窘境.为了避免此类情况,从Fat Tree构架的网络拓扑特点入手,提出"独立路径集"的概念,并以路径资源管理的理念对数据中心网络节能机制展开研究.利用软件定义网络对网络节点的监控能力,着眼全局控制,根据实时流量情况动态地调整数据中心网络资源配置.在满足当前流量需求的同时,关闭或休眠闲置的交换机,从而达到节能的目的.通过仿真实验及相关分析,证明该方法具备可行性和可操作性,为进一步拓展研究打下了基础. 展开更多
关键词 网络节能 资源管理 独立路径集 软件定义网络
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Penalty model for delay of bidding section construction period in South-to-North Water Diversion Eastern Route Project from perspective of programs 被引量:2
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作者 Jing-chun FENG Ya-fang REN +2 位作者 Zhong-nan DUAN Zhan-jun LIU Hai-yang LI 《Water Science and Engineering》 EI CAS 2012年第3期350-360,共11页
According to the multi-project and program management theory, this paper analyzes the program generation principle and establishes a program based on progress goals. On the basis of the present situation of calculatio... According to the multi-project and program management theory, this paper analyzes the program generation principle and establishes a program based on progress goals. On the basis of the present situation of calculation of penalty for delay of the bidding section construction period with the critical path method, we studied the effects of contractor-induced delay of the bidding section construction period in detail, including the effects on the construction period of the bidding section itself, the earliest start times of the next bidding section and other subsequent bidding sections, and the construction period of the program, and then constructed a penalty model for delay of the bidding section construction period from the perspective of programs. Using the penalty model, we conducted a practical analysis of penalty for delay of the construction period of the Baoying station program in the South-to-North Water Diversion Project. The model can help determine the amount of penalty for delay of the construction period in bidding sections scientifically and reasonably, 展开更多
关键词 program establishment program management bidding section construction period critical path method (CPM) penaly model South-to-North Water Diversion Project
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