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arXiv 0907.3068cs.GT
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一种确定性的可信PTAS调度算法

A deterministic truthful PTAS for scheduling related machines

George Christodoulou, Annamaria Kovacs

摘要:

相关机排序问题($Q||C_{\max}$)是机械机制设计领域的重要问题之一。每台机器都由一个自私的代理人控制,她的价值可以通过一个参数来表达,她的{ \em速度}。与其他类似的问题相比,Archer和Tardos \cite{AT01}证明了一个最小化完工时间的算法可以真实地实现,尽管是在指数时间内。另一方面,如果我们忽略了博弈论问题,问题的复杂性已经完全解决了-该问题是强NP-困难的,而存在PTAS \cite{HS88,ES04}。该问题是单参数算法机制设计中研究得最多的问题。它为探索真实性和有效计算之间的边界提供了一个很好的基础。自从Archer和Tardos的工作以来,已经提出了很多确定性和随机性机制。最近,一个突破性的结果\cite{DDDR08}表明,一个随机的真实PTAS存在。另一方面,对于确定性的情况,已知的最佳近似因子是2.8 \cite{Kov05,Kov07}。是否存在确定性的真PTAS,或者真性是否对问题的计算复杂性有本质的负面影响,这一直是一个主要的开放问题。在本文中,我们给出了一个明确的答案,这个重要的问题,通过提供一个真实的{ \em确定性} PTAS。

英文摘要:

Scheduling on related machines ($Q||C_{\max}$) is one of the most important problems in the field of Algorithmic Mechanism Design. Each machine is controlled by a selfish agent and her valuation can be expressed via a single parameter, her {\em speed}. In contrast to other similar problems, Archer and Tardos \cite{AT01} showed that an algorithm that minimizes the makespan can be truthfully implemented, although in exponential time. On the other hand, if we leave out the game-theoretic issues, the complexity of the problem has been completely settled -- the problem is strongly NP-hard, while there exists a PTAS \cite{HS88,ES04}. This problem is the most well studied in single-parameter algorithmic mechanism design. It gives an excellent ground to explore the boundary between truthfulness and efficient computation. Since the work of Archer and Tardos, quite a lot of deterministic and randomized mechanisms have been suggested. Recently, a breakthrough result \cite{DDDR08} showed that a randomized truthful PTAS exists. On the other hand, for the deterministic case, the best known approximation factor is 2.8 \cite{Kov05,Kov07}. It has been a major open question whether there exists a deterministic truthful PTAS, or whether truthfulness has an essential, negative impact on the computational complexity of the problem. In this paper we give a definitive answer to this important question by providing a truthful {\em deterministic} PTAS.

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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