arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1201.0946cs.DMcs.GTcs.ROmath.COmath.PR
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警察与隐形强盗:醉酒的代价

Cops and Invisible Robbers: the Cost of Drunkenness

Athanasios Kehagias, Dieter Mitsche, Pawel Pralat

摘要:

我们研究了一个版本的警察和强盗(CR)游戏,其中强盗是不可见的,即,警察在抓到他之前不知道他的位置显然,这个游戏(CiR)在CR文献中很少受到关注。我们检查两个变体:在第一种情况下,抢劫者是敌对的(他积极地试图避免被捕);在第二种情况下,他喝醉了(他进行随机行走)。我们在本文中的目标是研究无形的醉酒成本(iCOD),它被定义为ct_i(G)/dct_i(G)的比率,ct_i(G)和dct_i(G)分别是对抗和醉酒CiR变体的预期捕获时间。我们表明,这些捕获时间是很好的定义,使用博弈论的对抗情况下,部分可观察马尔可夫决策过程(POMDP)的醉酒的情况下。我们给出了几个特殊图族如$d$ -正则树的iCOD的精确渐近值,给出了网格的一些界,并给出了一般图类的一般上界和下界.我们还给出了一个无限图族,证明了iCOD可以任意地接近于[2,infinty]中的任意值.最后,我们简要地研究了一个更CiR的变体,其中强盗是无形的,“无限快”,我们认为,这种变体是显着不同的图形搜索游戏,尽管两个游戏之间的一些相似之处。

英文摘要:

We examine a version of the Cops and Robber (CR) game in which the robber is invisible, i.e., the cops do not know his location until they capture him. Apparently this game (CiR) has received little attention in the CR literature. We examine two variants: in the first the robber is adversarial (he actively tries to avoid capture); in the second he is drunk (he performs a random walk). Our goal in this paper is to study the invisible Cost of Drunkenness (iCOD), which is defined as the ratio ct_i(G)/dct_i(G), with ct_i(G) and dct_i(G) being the expected capture times in the adversarial and drunk CiR variants, respectively. We show that these capture times are well defined, using game theory for the adversarial case and partially observable Markov decision processes (POMDP) for the drunk case. We give exact asymptotic values of iCOD for several special graph families such as $d$-regular trees, give some bounds for grids, and provide general upper and lower bounds for general classes of graphs. We also give an infinite family of graphs showing that iCOD can be arbitrarily close to any value in [2,infinty). Finally, we briefly examine one more CiR variant, in which the robber is invisible and "infinitely fast"; we argue that this variant is significantly different from the Graph Search game, despite several similarities between the two games.

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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