| 摘要: |
| 不同于以往的介数模型,分析了Internet级联动力学特点,提出了节点拥塞函数,相当于给每个节点赋予一个动态权值,以表征该节点的拥塞程度.引入延迟时间的概念,在永久删除策略和不删除策略之间建立关联,以增强模型的灵活性.基于拥塞作用建立新的网络效率评估函数,并以此衡量级联故障的严重性.基于同质Statnet和异质Webgraph两种拓扑,研究不同的拓扑结构、规模、延迟时间、节点处理能力和包产生速率对拥塞传播的影响,揭示出级联故障传播分为3个阶段以及影响传播的部分主要因素. |
| 关键词: 互联网 复杂网络 级联故障 拥塞作用 传播模型 |
| DOI： |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.60973136 (国家自然科学基金); the China-British Columbia Innovation and Commercialization Strategic Development under Grant No.2008DFA12140 (国际科技合作与交流专项); the Graduate Innovation Fund of Jilin University of China under Grant 20101029 (吉林大学研究生创新基金); the Europe Cooperation Project under Grant No.155776-EM-1-2009-1-IT-ERAMUNDUS-ECW-L12 (欧盟合作计划) |
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| Analyzing and Modeling Cascading Dynamics of Internet |
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WANG Jian,LIU Yan-Heng,ZHANG Cheng,LI Cheng-Yue
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| Abstract: |
| The characteristics of cascading dynamics of Internet are analyzed. Different from betweenness centrality, a congestion function to represent the congested extent of node is proposed to assign a dynamic weight to every node. By introducing the concept of “delay time”, the intergradation between permanent removal and nonremoval is built in order to improve the flexibility of the model. A new evaluation function of network efficiency, based on congestion effects, is given in order to measure the damage caused by cascading failures. Finally, based on Statnet and Webgraph topologies the effects of network structure and size, delay time, processing ability and traffic generation speed on congestion propagation are investigated. The congestion propagation process composed of three phases and some factors affecting transition phenomenon are also uncovered. |
| Key words: Internet complex network cascading failure congestion effect propagation model |
