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arXiv 1004.2839cs.DM
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容量约束控制问题的近似算法

Approximation Algorithms for the Capacitated Domination Problem

Mong-Jen Kao, Han-Lin Chen

摘要:

我们考虑{ \em Capacitated Domination}问题,它模拟了服务需求分配场景,也是著名的{ \em支配集}问题的推广。在这个问题中,给定一个图,每个顶点上定义了三个参数,即成本,容量和需求,我们要找到一个分配的需求最小成本的顶点,使每个顶点的需求得到满足的能力约束的每个顶点提供的服务。在多项式时间近似下,给出了一般图上该问题不同需求分配模型的对数近似算法,并建立了传统{ \em支配集}问题的近似结果.与我们以前的工作一起,这关闭了一般近似最优解的问题。另一方面,从参数化的角度,我们证明了这个问题是{ \it W[1]}-困难时,称为树宽度的图的结构参数。基于这一硬度的结果,我们提出了确切的固定参数听话的算法时,参数树的宽度和最大容量的顶点。将该算法进一步推广,得到平面图的伪多项式时间逼近方案。

英文摘要:

We consider the {\em Capacitated Domination} problem, which models a service-requirement assignment scenario and is also a generalization of the well-known {\em Dominating Set} problem. In this problem, given a graph with three parameters defined on each vertex, namely cost, capacity, and demand, we want to find an assignment of demands to vertices of least cost such that the demand of each vertex is satisfied subject to the capacity constraint of each vertex providing the service. In terms of polynomial time approximations, we present logarithmic approximation algorithms with respect to different demand assignment models for this problem on general graphs, which also establishes the corresponding approximation results to the well-known approximations of the traditional {\em Dominating Set} problem. Together with our previous work, this closes the problem of generally approximating the optimal solution. On the other hand, from the perspective of parameterization, we prove that this problem is {\it W[1]}-hard when parameterized by a structure of the graph called treewidth. Based on this hardness result, we present exact fixed-parameter tractable algorithms when parameterized by treewidth and maximum capacity of the vertices. This algorithm is further extended to obtain pseudo-polynomial time approximation schemes for planar 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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