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2016 ; 6
(ä): 26346
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Strength of weak layers in cascading failures on multiplex networks: case of the
international trade network
#MMPMID27211291
Lee KM
; Goh KI
Sci Rep
2016[May]; 6
(ä): 26346
PMID27211291
show ga
Many real-world complex systems across natural, social, and economical domains
consist of manifold layers to form multiplex networks. The multiple network
layers give rise to nonlinear effect for the emergent dynamics of systems.
Especially, weak layers that can potentially play significant role in amplifying
the vulnerability of multiplex networks might be shadowed in the aggregated
single-layer network framework which indiscriminately accumulates all layers.
Here we present a simple model of cascading failure on multiplex networks of
weight-heterogeneous layers. By simulating the model on the multiplex network of
international trades, we found that the multiplex model produces more
catastrophic cascading failures which are the result of emergent collective
effect of coupling layers, rather than the simple sum thereof. Therefore risks
can be systematically underestimated in single-layer network analyses because the
impact of weak layers can be overlooked. We anticipate that our simple
theoretical study can contribute to further investigation and design of optimal
risk-averse real-world complex systems.