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arXiv 1407.1664physics.soc-phcs.SI
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三元闭包作为复杂网络社区生成的基本机制

Triadic closure as a basic generating mechanism of communities in complex networks

Ginestra Bianconi, Richard K. Darst, Jacopo Iacovacci, Santo Fortunato

摘要:

大多数复杂的社会、技术和生物网络都具有重要的社区结构。因此,复杂网络的社区结构必须被认为是一个普遍的属性,以及这些网络的小世界和无标度属性。尽管在描述真实网络的社区结构方面有很大的兴趣,但没有足够的注意力用于检测能够自发生成社区网络的通用机制。三元闭合是建立新联系的自然机制,特别是在社交网络中。在这里,我们表明,基于简单的三元封闭的网络增长模型自然会导致社区结构的出现,以及节点度的厚尾分布,高聚类系数。社区从最初的随机异质性的链接集中出现,随后是一个周期的增长和分裂。社区是更明显的,稀疏的图,并在连接过程中的链接密度和随机性的高值消失。通过引入一个基于适应度的链接吸引的节点,我们发现了一个新的相变,社区消失的适应度分布的高度异质性,但一个新的介观组织的节点出现,与几个超级枢纽之间共享的节点组,吸引了系统的大部分链接。

英文摘要:

Most of the complex social, technological and biological networks have a significant community structure. Therefore the community structure of complex networks has to be considered as a universal property, together with the much explored small-world and scale-free properties of these networks. Despite the large interest in characterizing the community structures of real networks, not enough attention has been devoted to the detection of universal mechanisms able to spontaneously generate networks with communities. Triadic closure is a natural mechanism to make new connections, especially in social networks. Here we show that models of network growth based on simple triadic closure naturally lead to the emergence of community structure, together with fat-tailed distributions of node degree, high clustering coefficients. Communities emerge from the initial stochastic heterogeneity in the concentration of links, followed by a cycle of growth and fragmentation. Communities are the more pronounced, the sparser the graph, and disappear for high values of link density and randomness in the attachment procedure. By introducing a fitness-based link attractivity for the nodes, we find a novel phase transition, where communities disappear for high heterogeneity of the fitness distribution, but a new mesoscopic organization of the nodes emerges, with groups of nodes being shared between just a few superhubs, which attract most of the links of the system.

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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