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arXiv physics/0609150physics.soc-phphysics.bio-ph
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具有相同传染性的异质网络上的传染病传播

Epidemic spreading on heterogeneous networks with identical infectivity

Rui Yang, Bing-Hong Wang, Jie Ren, Wen-Jie Bai, Zhi-Wen Shi, Wen-Xu Wang, Tao Zhou

摘要:

在本文中,我们提出了一个修改的易感染-感染-恢复(SIR)模型,其中每个节点被分配一个相同的能力,积极接触,$A$,在每个时间步。与以往的研究相比,我们发现在无标度网络上,本模型中恢复个体的密度表现出阈值行为。我们利用平均场论得到了分析结果,发现阈值等于1/A,表明阈值与底层网络的拓扑结构无关。仿真结果与理论分析结果吻合较好。此外,我们研究了传染病传播的时间行为,发现了一个具有三个平台的分层动力学。一旦到达高度连接的枢纽,感染几乎遍及整个网络,在较小的程度类别中逐步级联。然后,在先前被感染的枢纽恢复之后,疾病只能传播到最小程度的类,直到被感染的个体全部恢复。本文的研究结果对动态控制策略的制定具有实际意义。

英文摘要:

In this paper, we propose a modified susceptible-infected-recovered (SIR) model, in which each node is assigned with an identical capability of active contacts, $A$, at each time step. In contrast to the previous studies, we find that on scale-free networks, the density of the recovered individuals in the present model shows a threshold behavior. We obtain the analytical results using the mean-field theory and find that the threshold value equals 1/A, indicating that the threshold value is independent of the topology of the underlying network. The simulations agree well with the analytic results. Furthermore, we study the time behavior of the epidemic propagation and find a hierarchical dynamics with three plateaus. Once the highly connected hubs are reached, the infection pervades almost the whole network in a progressive cascade across smaller degree classes. Then, after the previously infected hubs are recovered, the disease can only propagate to the class of smallest degree till the infected individuals are all recovered. The present results could be of practical importance in the setup of dynamic control strategies.

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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