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arXiv 1502.05599cs.SIcs.DSmath.CO
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时间和预算约束下加权网络中的影响扩散

Spread of Influence in Weighted Networks under Time and Budget Constraints

Ferdinando Cicalese, Gennaro Cordasco, Luisa Gargano, Martin Milanic, Joseph Peters, Ugo Vaccaro

摘要:

给定一个由加权有向图G表示的网络,我们考虑找到一个有界成本的节点集S,使得在给定的时间范围内,从S传播到G的影响力尽可能大的问题。控制影响力扩散的动态如下:最初只有S中的元素受到影响;随后在每一轮中,受影响元素的集合被网络中具有足够多的已受影响邻居的所有节点所增加。我们证明了这个问题是NP难的,即使在简单的网络,如完全图和树。我们也得到了一系列积极的结果。我们提出了精确的伪多项式时间算法一般的树,成为多项式时间的情况下,树是unweighted。最后一个结果改进了以前发表的结果。我们还设计了一般的加权路和圈的多项式时间算法,并为非加权完全图。

英文摘要:

Given a network represented by a weighted directed graph G, we consider the problem of finding a bounded cost set of nodes S such that the influence spreading from S in G, within a given time bound, is as large as possible. The dynamic that governs the spread of influence is the following: initially only elements in S are influenced; subsequently at each round, the set of influenced elements is augmented by all nodes in the network that have a sufficiently large number of already influenced neighbors. We prove that the problem is NP-hard, even in simple networks like complete graphs and trees. We also derive a series of positive results. We present exact pseudo-polynomial time algorithms for general trees, that become polynomial time in case the trees are unweighted. This last result improves on previously published results. We also design polynomial time algorithms for general weighted paths and cycles, and for unweighted complete graphs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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