Abstract
Aiming at the effectiveness of global importance index of nodes in directed network, according to complex network theory, using degree index, intermediate centrality index, proximity centrality index and PageRank algorithm, the importance ranking of nodes is obtained,The global efficiency of the network and the number of nodes in the maximum connected subgraph are used as the criterion to attack the directed network with priority of node importance, analyzing the effectiveness of four indexes to evaluate the global importance of nodes.The global importance of nodes is studied by using the index with high effectiveness. By protecting the nodes with high global importance, the survivability and the overall efficiency of the directed network can be improved.
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