基于邻居节点平均度的级联故障袭击策略研究

An Attack Strategy of Cascading Failures Based on Neighbor-Nodes Average Degree

袭击策略是复杂网络抵制级联故障的鲁棒性问题中一个重要的研究内容。根据节点局域信息的初始负荷,考虑邻居节点的平均度,提出了一种新的级联故障袭击策略——邻居节点平均度(NAD)策略。理论分析了关键阈值CT与可调参数?之间的关系,并通过数值模拟对比两种经典的袭击策略,研究发现针对单层网络结构,提出的NAD袭击策略对BA无标度网络攻击最有效。此外,基于BA-BA网络构成的多层耦合网络级联故障模型,最大平均度袭击策略数值模拟得出的结果较好地验证了已有理论解析结果。通过建立突发事件关联耦合网络模型,以上研究能够揭示系统发生级联故障的条件,从而提出预防耦合网络崩溃的保护策略。

Recently the attack strategy has become a hot topic to study the robustness against cascading failures in complex networks. Considering a node’s initial load and the average degree of the neighboring nodes, we propose a new attack strategy, neighbor-nodes average degree （NAD）, and analyze the correlation between the critical threshold T C and tunable parameterα. By comparing the two attack strategies on the nodes with the highest load and the lowest load, we find that the proposed attack strategy is an efficient way to destruct the BA scale-free networks in the range ofα. In addition, on the base of the model of BA-BA coupled networks, the preliminary numerical simulation on the proposed attack strategy verifies the mathematic analysis of the targeted-attack to random-attack. By creating a model of the correlated coupled networks for the emergency, we can investigate the condition on cascading failure for the model and propose a protective strategy for preventing avalanche of coupled networks.