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arXiv 1312.7243cs.DS
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$\IR^2$中点集的最小支配集

Minimum Dominating Set for a Point Set in $\IR^2$

Ramesh K. Jallu, Prajwal R. Prasad, Gautam K. Das

摘要:

本文考虑了$\IR^2$中$n$点的给定集合$S$的最小支配集的计算问题。这里的目标是找到$S$的最小基数子集$S'$,使得以$S'$中的点为中心的单位半径圆盘的并集覆盖$S$中的所有点。我们首先提出了一个简单的4-因子和3-因子近似算法,分别在$O(n^6 \log n)$和$O(n^{11} \log n)$时间上,将时间复杂度分别提高了$O(n^2)$和$O(n^4)$倍[M. De,G.K. Das,P. Carmi和S.C.张文,{单位圆盘离散穿孔集问题的\it近似算法},国际比较几何与应用学报,出现)。最后,我们提出了一个非常重要的移位引理,这是独立的利益,并使用这个引理,我们提出了一个$\frac{5}{2}$ -因子近似算法和PTAS的最小支配集问题。

英文摘要:

In this article, we consider the problem of computing minimum dominating set for a given set $S$ of $n$ points in $\IR^2$. Here the objective is to find a minimum cardinality subset $S'$ of $S$ such that the union of the unit radius disks centered at the points in $S'$ covers all the points in $S$. We first propose a simple 4-factor and 3-factor approximation algorithms in $O(n^6 \log n)$ and $O(n^{11} \log n)$ time respectively improving time complexities by a factor of $O(n^2)$ and $O(n^4)$ respectively over the best known result available in the literature [M. De, G.K. Das, P. Carmi and S.C. Nandy, {\it Approximation algorithms for a variant of discrete piercing set problem for unit disk}, Int. J. of Comp. Geom. and Appl., to appear]. Finally, we propose a very important shifting lemma, which is of independent interest and using this lemma we propose a $\frac{5}{2}$-factor approximation algorithm and a PTAS for the minimum dominating set problem.

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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