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arXiv 0704.1952physics.soc-phphysics.class-ph
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动态效应增加网络对级联故障的脆弱性

Dynamic Effects Increasing Network Vulnerability to Cascading Failures

Ingve Simonsen, Lubos Buzna, Karsten Peters, Stefan Bornholdt, Dirk Helbing

摘要:

我们研究网络中的级联故障,使用一个动态流模型的基础上简单的守恒和分布规律,调查的影响,瞬态动态的负载重新平衡后,初始网络故障(触发事件)。据发现,考虑流动态可能意味着降低网络的鲁棒性相比,以前的静态过载故障模型。这是由于当流量动态调整到新的(剩余的)网络结构时,负载中的瞬态振荡或过冲。我们得到{ \em上限}和{ \em下限}限制网络的鲁棒性,它表明,{ \it两}时间尺度$τ$和$τ_0$,定义的网络动态,是重要的考虑之前,准确地解决网络的鲁棒性或脆弱性。显示级联故障的网络的鲁棒性通常由网络拓扑和流动态之间的复杂相互作用确定,其中比率$χ=τ/τ_0$确定它们两者的相对作用。

英文摘要:

We study cascading failures in networks using a dynamical flow model based on simple conservation and distribution laws to investigate the impact of transient dynamics caused by the rebalancing of loads after an initial network failure (triggering event). It is found that considering the flow dynamics may imply reduced network robustness compared to previous static overload failure models. This is due to the transient oscillations or overshooting in the loads, when the flow dynamics adjusts to the new (remaining) network structure. We obtain {\em upper} and {\em lower} limits to network robustness, and it is shown that {\it two} time scales $τ$ and $τ_0$, defined by the network dynamics, are important to consider prior to accurately addressing network robustness or vulnerability. The robustness of networks showing cascading failures is generally determined by a complex interplay between the network topology and flow dynamics, where the ratio $χ=τ/τ_0$ determines the relative role of the two of them.

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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