arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.12894cs.GTcs.AIcs.DS
收藏

线上设施再分配

Facility Reallocation on the Line

King’s College London(伦敦国王学院);University of Liverpool(利物浦大学)

Bart de Keijzer, Dominik Wojtczak

摘要:

我们考虑一个多阶段的设施重新分配问题的实际生产线上,一个设施被移动的时间阶段之间的位置报告的基础上,由$n$代理。重新分配算法的目的是使社会成本最小化,即,设施与所有阶段的所有代理之间的总距离之和,加上移动设施所产生的成本。我们在离线和在线环境下研究这个问题。在离线情况下,算法完全知道所有未来阶段中的代理位置,而在在线设置中,算法不知道这些未来位置,必须在逐阶段的基础上决定设施的位置。我们推导出这两种情况下的最优算法。对于在线设置,我们证明了它的竞争比是$(n+2)/(n+1)$。由于这些算法都没有产生一个防策略机制,我们提出了另一种防策略机制,它具有竞争比$(n+3)/(n+1)$为奇数$n$和$(n+4)/n$为偶数$n$,我们推测是最好的可能。我们还考虑了多个设施和加权代理的推广,我们表明,最佳可以计算在多项式时间为固定数量的设施。

英文摘要:

We consider a multi-stage facility reallocation problems on the real line, where a facility is being moved between time stages based on the locations reported by $n$ agents. The aim of the reallocation algorithm is to minimise the social cost, i.e., the sum over the total distance between the facility and all agents at all stages, plus the cost incurred for moving the facility. We study this problem both in the offline setting and online setting. In the offline case the algorithm has full knowledge of the agent locations in all future stages, and in the online setting the algorithm does not know these future locations and must decide the location of the facility on a stage-per-stage basis. We derive the optimal algorithm in both cases. For the online setting we show that its competitive ratio is $(n+2)/(n+1)$. As neither of these algorithms turns out to yield a strategy-proof mechanism, we propose another strategy-proof mechanism which has a competitive ratio of $(n+3)/(n+1)$ for odd $n$ and $(n+4)/n$ for even $n$, which we conjecture to be the best possible. We also consider a generalisation with multiple facilities and weighted agents, for which we show that the optimum can be computed in polynomial time for a fixed number of facilities.

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。

↑