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arXiv 0906.0409cs.DScs.DM
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二维在线装箱问题的一个新上界

A New Upper Bound on 2D Online Bin Packing

Xin Han, Francis Y. L. Chin, Hing-Fung Ting, Guochuan Zhang

摘要:

二维在线装箱问题是计算机科学中的一个基本问题,其渐近竞争比的确定一直是研究的热点。在一系列的论文中,这个比率的下限已经从1.808,1.856提高到1.907,其上限从3.25,3.0625,2.8596,2.7834降低到2.66013。在本文中,我们将上限记录重写为2.5545。我们的改进意见如下。在SODA 2002 \cite{SS03}中,Seiden和van Stee提出了一种称为$H \otimes B$的优雅算法,该算法由{ \em Harmonic算法} $H$和{ \em Improved Harmonic算法} $B$组成,用于二维在线装箱问题,并证明了该算法的渐近竞争比至多为2.66013。由于一维装箱的最著名的在线算法是{ \em Super Harmonic algorithm} \cite{S02},因此自然会问:使用Super Harmonic算法而不是Improved Harmonic算法是否可以获得更好的上界?但是,正如\cite{SS03}中所提到的,前面的分析框架不起作用。本文对上述问题给予了肯定的回答。得到了二维在线装箱的一个新的上界为2.5545。其主要思想是开发新的加权函数的超级谐波算法,并提出新的技术,以限制在一个矩形箱的总重量。

英文摘要:

The 2D Online Bin Packing is a fundamental problem in Computer Science and the determination of its asymptotic competitive ratio has attracted great research attention. In a long series of papers, the lower bound of this ratio has been improved from 1.808, 1.856 to 1.907 and its upper bound reduced from 3.25, 3.0625, 2.8596, 2.7834 to 2.66013. In this paper, we rewrite the upper bound record to 2.5545. Our idea for the improvement is as follows. In SODA 2002 \cite{SS03}, Seiden and van Stee proposed an elegant algorithm called $H \otimes B$, comprised of the {\em Harmonic algorithm} $H$ and the {\em Improved Harmonic algorithm} $B$, for the two-dimensional online bin packing problem and proved that the algorithm has an asymptotic competitive ratio of at most 2.66013. Since the best known online algorithm for one-dimensional bin packing is the {\em Super Harmonic algorithm} \cite{S02}, a natural question to ask is: could a better upper bound be achieved by using the Super Harmonic algorithm instead of the Improved Harmonic algorithm? However, as mentioned in \cite{SS03}, the previous analysis framework does not work. In this paper, we give a positive answer for the above question. A new upper bound of 2.5545 is obtained for 2-dimensional online bin packing. The main idea is to develop new weighting functions for the Super Harmonic algorithm and propose new techniques to bound the total weight in a rectangular bin.

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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