中文摘要：

现实网络的有向性使得有向网络更能够准确地模拟显示网络,而当前研究的热点是怎么样用最小的代价对网络进行免疫。基于节点连接的不均匀性,提出的目标免疫被认为是最好的免疫策略。针对更符合实际的有向无标度网络,提出了基于双向链接的核心免疫策略。与目标免疫相比,该策略可以是网络获得较好的免疫效果,并且能更好地保持网络的连通性。采用SI病毒传播模型研究病毒爆发初期的情况,在双向网络分别测试了该免疫的性能和网络效率,证明了该免疫的高效性。

英文摘要：

There is much interest in the question of how to immunize a directed network with a minimal number of network doses. It is widely accepted that the targeted strategy, based on uniform connections of nodes, is the most efficient immunization strategy. We present core immunization strategy for directed power law networks, which requires fewer immunization doses compared with the targeted strategy and gets the same dense of infected nodes. The strategy can keep better network efficiency than the targeted strategy. Using the susceptible-infectious SI epidemic spreading model, we explicitly demonstrate the effectiveness of our proposed strategy on directed network.