arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.02567physics.soc-phcs.SI
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有向网络中由PageRank节点影响驱动的意见形成

Opinion formation driven by PageRank node influence on directed networks

Young-Ho Eom, Dima L. Shepelyansky

摘要:

我们研究了两个国家的意见形成模型驱动的PageRank节点的影响,并报告了一个广泛的数值研究如何PageRank影响集体意见的形成在大规模的经验有向网络。在我们的模型中,一个节点的意见可以更新的总和,其邻居节点的意见加权的节点影响力的邻居节点在每一步。我们考虑PageRank概率和它的次线性功率作为节点影响力的措施,并调查在各种条件下的意见的演变。首先,我们观察到所有的网络在一定的松弛时间后达到稳定状态的意见。这个时间尺度随着网络中节点影响的异质性而减小。其次,我们发现我们的模型在稳态下表现出共识和非共识行为,这取决于网络的类型:Web图,物理学文章的引用网络和LiveJournal社交网络表现出非共识行为,而维基百科文章网络表现出共识行为。第三,我们发现,一个更异质的影响力分布导致一个更统一的意见状态的情况下,Web图,维基百科和Livejournal。然而,在引文网络中观察到相反的行为。最后,我们确定,少数有影响力的节点可以施加自己的意见,在所有考虑的网络中的其他节点的显着部分。我们的研究表明,节点影响力的异质性对意见形成的影响可能是显着的,并建议进一步研究网络中节点影响力和集体意见之间的相互作用。

英文摘要:

We study a two states opinion formation model driven by PageRank node influence and report an extensive numerical study on how PageRank affects collective opinion formations in large-scale empirical directed networks. In our model the opinion of a node can be updated by the sum of its neighbor nodes' opinions weighted by the node influence of the neighbor nodes at each step. We consider PageRank probability and its sublinear power as node influence measures and investigate evolution of opinion under various conditions. First, we observe that all networks reach steady state opinion after a certain relaxation time. This time scale is decreasing with the heterogeneity of node influence in the networks. Second, we find that our model shows consensus and non-consensus behavior in steady state depending on types of networks: Web graph, citation network of physics articles, and LiveJournal social network show non-consensus behavior while Wikipedia article network shows consensus behavior. Third, we find that a more heterogeneous influence distribution leads to a more uniform opinion state in the cases of Web graph, Wikipedia, and Livejournal. However, the opposite behavior is observed in the citation network. Finally we identify that a small number of influential nodes can impose their own opinion on significant fraction of other nodes in all considered networks. Our study shows that the effects of heterogeneity of node influence on opinion formation can be significant and suggests further investigations on the interplay between node influence and collective opinion in networks.

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