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arXiv 1402.5783cs.DMcs.CG
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基于第二Hamilton圈的对偶功率分配

Dual Power Assignment via Second Hamiltonian Cycle

Karim Abu-Affash, Paz Carmi, Anat Parush Tzur

摘要:

功率分配是将传输功率分配给无线网络的每个无线节点,以便诱导图满足某些期望的属性。功率分配的成本是分配的功率的总和。在本文中,我们考虑的双功率分配问题,其中每个无线节点被分配一个高或低的功率水平,使诱导图是强连通的,分配的成本最小化。我们将已知的最佳逼近比从$\frac{π^2}{6}-\frac{1}{36}+ε\thickapprox 1.617$提高到$\frac{11}{7}\thickapprox 1.571$。此外,我们证明了Khuller等人对于强连通生成子图问题的算法是对称有向图的$1.522$ -近似算法,该算法达到了$1.61$的近似比.本文的创新之处在于通过利用第二个哈密顿循环存在的有趣性质来实现这些结果。

英文摘要:

A power assignment is an assignment of transmission power to each of the wireless nodes of a wireless network, so that the induced graph satisfies some desired properties. The cost of a power assignment is the sum of the assigned powers. In this paper, we consider the dual power assignment problem, in which each wireless node is assigned a high- or low-power level, so that the induced graph is strongly connected and the cost of the assignment is minimized. We improve the best known approximation ratio from $\frac{π^2}{6}-\frac{1}{36}+ε\thickapprox 1.617$ to $\frac{11}{7}\thickapprox 1.571$. Moreover, we show that the algorithm of Khuller et al. for the strongly connected spanning subgraph problem, which achieves an approximation ratio of $1.61$, is $1.522$-approximation algorithm for symmetric directed graphs. The innovation of this paper is in achieving these results via utilizing interesting properties for the existence of a second Hamiltonian cycle.

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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