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arXiv 0907.0900physics.soc-ph
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层次模块结构对有向网络中单个节点排序的影响

Impact of hierarchical modular structure on ranking of individual nodes in directed networks

Naoki Masuda, Yoji Kawamura, Hiroshi Kori

摘要:

许多系统,从生物和工程系统到社会系统,都可以建模为有向网络,其中链接表示两个节点之间的有向交互。为了评估节点在有向网络中的重要性,已经提出了基于不同标准的各种中心性度量。然而,计算一个节点的中心度往往是困难的,因为网络的规模过大或有关网络的信息不完整。因此,需要开发一种近似方法来估计中心性措施。在这项研究中,我们专注于模块化网络;许多现实世界的网络是由模块组成的,其中连接在一个模块内是密集的,在不同的模块之间是稀疏的。我们表明,排名类型的中心性措施,包括PageRank可以有效地估计一旦网络的模块化结构被提取。我们开发了一种分析方法来评估节点的中心性,通过结合本地属性(即,节点的入度和出度)和全局属性(即,模块的中心性)。所提出的方法与实际数据相印证。我们的研究结果提供了一个链接之间的排名类型的中心性值的模块和个人节点。它们还揭示了网络的层次结构,即不同相对重要性的模块之间的连接所形成的从属关系(而不是嵌套关系)。本研究提出了一个新的动机,确定模块的网络。

英文摘要:

Many systems, ranging from biological and engineering systems to social systems, can be modeled as directed networks, with links representing directed interaction between two nodes. To assess the importance of a node in a directed network, various centrality measures based on different criteria have been proposed. However, calculating the centrality of a node is often difficult because of the overwhelming size of the network or the incomplete information about the network. Thus, developing an approximation method for estimating centrality measures is needed. In this study, we focus on modular networks; many real-world networks are composed of modules, where connection is dense within a module and sparse across different modules. We show that ranking-type centrality measures including the PageRank can be efficiently estimated once the modular structure of a network is extracted. We develop an analytical method to evaluate the centrality of nodes by combining the local property (i.e., indegree and outdegree of nodes) and the global property (i.e., centrality of modules). The proposed method is corroborated with real data. Our results provide a linkage between the ranking-type centrality values of modules and those of individual nodes. They also reveal the hierarchical structure of networks in the sense of subordination (not nestedness) laid out by connectivity among modules of different relative importance. The present study raises a novel motive of identifying modules in networks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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