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  • 學位論文

在大型網路圖上計算完全子圖之最遠距離

Computing the Maximum Clique Distance on a Large-Scale Network

指導教授 : 趙坤茂
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摘要


我們研究完全子圖之最遠距離(clique diameter)問題。給定一個無向、無權重圖,並同時給定一個集合,集合包含圖上所有給定的完全子圖,該問題問其中任兩組完全子圖間之最遠距離為何?由於完全子圖可以代表一個理想的社群,其中每一成員均關聯於其它成員,本問題即是詢問圖上各社群之距離,以及距離最遠的一組社群。假設圖上有n個點與m個邊,同時給定r個完全子圖,我們設計一個O(r(n+m))時間且最多誤差為1的近似演算法,並提供一個轉換方式,讓我們得以運用全點最短路徑演算法來解決我們的研究問題。

並列摘要


We study the clique diameter problem. Given an undirected, unweighted graph containing a set of cliques, we are interested in finding the maximum distance among all pairs of cliques. In the context of social network analysis, a clique represents an ideal community, a clique distance represents the sparsity between the two communities, and a clique diameter indicates the farthest distance among the social network. Let n denote the number of nodes, m denote the number of edges and r denote the number of given cliques. We provide an O(r(n + m)) time algorithm to compute approximate clique distances with additive error of one. Another contribution is a reduction which transforms any instance of the clique distance problem into an instance of the all-pairs shortest paths problem.

參考文獻


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