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- W1967736226 abstract "The spread of a cascading failure through a network is an issue that comes up in many domains - in the contagious failures that spread among financial institutions during a financial crisis, through nodes of a power grid or communication network during a widespread outage, or through a human population during the outbreak of an epidemic disease. Here we study a natural model of threshold contagion: each node v is assigned a numerical threshold ℓ(v) drawn independently from an underlying distribution μ, and v will fail as soon as ℓ(v) of its neighbors fail. Despite the simplicity of the formulation, it has been very challenging to analyze the failure processes that arise from arbitrary threshold distributions; even qualitative questions concerning which graphs are the most resilient to cascading failures in these models have been difficult to resolve. Here we develop a set of new techniques for analyzing the failure probabilities of nodes in arbitrary graphs under this model, and we compare different graphs G according to their μ-risk, defined as the maximum failure probability of any node in G when thresholds are drawn from μ. We find that the space of threshold distributions has a surprisingly rich structure when we consider the risk that these thresholds induce on different graphs: small shifts in the distribution of the thresholds can favor graphs with a maximally clustered structure (i.e., cliques), those with a maximally branching structure (trees), or even intermediate hybrids." @default.
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- W1967736226 date "2011-10-01" @default.
- W1967736226 modified "2023-09-23" @default.
- W1967736226 title "Which Networks are Least Susceptible to Cascading Failures?" @default.
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- W1967736226 doi "https://doi.org/10.1109/focs.2011.38" @default.
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