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arXiv 1509.04557physics.soc-ph
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连锁过载故障的时空传播

Spatio-temporal propagation of cascading overload failures

Jichang Zhao, Daqing Li, Hillel Sanhedrai, Reuven Cohen, Shlomo Havlin

摘要:

与流行病传播中的直接接触不同,过载故障通过隐藏的函数依赖传播。许多研究集中在连锁故障的临界条件和灾难性后果。然而,为了理解网络脆弱性和减轻级联过载故障,故障如何在时间和空间上传播的知识是必不可少的,但仍然缺乏。在这里,我们研究的时空传播行为的连锁过载故障的解析和数值。连锁过载故障被发现从初始故障的中心以近似恒定的速度径向传播。传播速度随着容差的增加而降低,并且可以通过我们的理论框架很好地预测,对所有容差值进行一次校正。这种传播速度在各种模型网络和真实网络结构中是相似的。我们的研究结果可能有助于预测和减轻级联过载故障在现实系统中的动态。

英文摘要:

Different from the direct contact in epidemics spread, overload failures propagate through hidden functional dependencies. Many studies focused on the critical conditions and catastrophic consequences of cascading failures. However, to understand the network vulnerability and mitigate the cascading overload failures, the knowledge of how the failures propagate in time and space is essential but still missing. Here we study the spatio-temporal propagation behavior of cascading overload failures analytically and numerically. The cascading overload failures are found to spread radially from the center of the initial failure with an approximately constant velocity. The propagation velocity decreases with increasing tolerance, and can be well predicted by our theoretical framework with one single correction for all the tolerance values. This propagation velocity is found similar in various model networks and real network structures. Our findings may help to predict and mitigate the dynamics of cascading overload failures in realistic systems.

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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