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Approximating the k-splittable capacitated network design problem

机译:逼近k可分裂的电容网络设计问题

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We consider the k-Splittable Capacitated Network Design Problem (kSCND) in a graph G = (V, E) with edge weight w(e) >= 0, e E E. We are given a vertex t E V designated as a sink, a cable capacity lambda > 0, and a source set S subset of V with demand d(v) >= 0, v E S. For any edge e E E, we are allowed to install an integer number x(e) of copies of e. The kSCND asks to simultaneously send demand d(v) from each source v E S along at most k paths to the sink t. A set of such paths can pass through an edge in G as long as the total demand along the paths does not exceed the capacity x(e)lambda. The objective is to find a set P of paths of G that minimize the installing cost Sigma(e is an element of E) x(e)w(e).In this paper, we propose a ((k + 1)/k + P-ST)-approximation algorithm to the kSCND, where P-ST is any approximation ratio achievable for the Steiner tree problem. (C) 2016 Elsevier B.V. All rights reserved.
机译:我们在图G =(V,E)且边权重w(e)> = 0,e E E的图中考虑k可分裂电容网络设计问题(kSCND)。给定一个顶点t EV,指定为汇点,电缆容量lambda> 0,并且V的源集S子集的需求d(v)> = 0,v ES。对于任何边e EE,我们都可以安装整数x(e)的副本e。 kSCND要求同时沿着最多k条路径将每个源v E S的需求d(v)同时发送到宿t。只要沿着这些路径的总需求不超过容量x(e)lambda,一组这样的路径就可以通过G中的一条边。目的是找到一组G的路径P,以使安装成本最小化Sigma(e是E的元素)x(e)w(e)。在本文中,我们提出((k + 1)/ k kSCND的近似算法),其中P-ST是Steiner树问题可达到的任何近似比率。 (C)2016 Elsevier B.V.保留所有权利。

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