网络相变的非线性成因与分布式代理对策  

Nonlinear phase transitions in networks and distributed proxy approach

作　　者：李一鹏[1] 任勇[1] 袁坚[1] 王磊[1] 樊华[1] 山秀明[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第8期1131-1134,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(60672142;60772053;60674048)

摘　　要：为改善计算机网络非线性影响,以及用户行为带来的网络性能波动,分析了网络性能相变的非线性机制,在改进的二维耦合网络模型中对规则网络、具有访问群聚特性的网络和引入分布式代理的网络进行仿真对比。研究表明:在路由器非线性的作用下,网络存在相变特性;与目的节点随机选取的规则网络相比,超文本链接网络中访问行为的大规模群聚特性使网络相变点明显左移,网络性能相对恶化;针对这种情况采用分布式代理对策,使网络相变点右移,网络性能得到明显改善。The network performance fluctuations caused by user behaviors were analyzed to reduce the effect of nonlinear phase transition in the computer network. A modified two-dimensional coupling network model was used to analyze the regular networks and the clustering characteristic with a distributed proxy used to improve the performance. The results show that the nonlinear network router characteristics cause the network performance to have phase transitions. Compared with regular networks, the extreme clustering of the access behavior in http networks gives rise to a left-shift of the phase transition point, which degrades the network performance. A distributed proxy approach is used to increase the resource node proxies and right-shift the phase transition point with obvious improvement of the network performance.

关 键 词：网络相变 非线性 元胞自动机 分布式代理 

分 类 号：TN393.01[电子电信—物理电子学]