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arXiv 1602.04881cs.DCcs.DMmath.CO
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不经意移动机器人通用系统

Universal Systems of Oblivious Mobile Robots

Paola Flocchini, Nicola Santoro, Giovanni Viglietta, Masafumi Yamashita

摘要:

遗忘移动机器人是一个位于空间宇宙中的无状态计算实体,能够在该宇宙中移动。当被激活时,机器人观察宇宙和其他机器人的位置,选择一个目的地,并移动到那里。目的地的计算是通过执行一个算法来完成的,这个算法对所有机器人都是一样的,它的唯一输入是当前的观察结果。所有这些动作的记忆在移动后都不会保留。当宇宙是一个图时,由不经意的移动机器人进行的分布式计算已经被深入研究,重点是基本问题的可行性条件(例如,收集、探索)在不同的分类器下的特定类别的图中。在本文中,我们开始一个不同的,更一般的,类型的调查。随着机器人从顶点到相邻顶点的运动,系统从一种配置过渡到另一种配置。将这种转变看作是对抽象函数的计算,我们要问哪些函数是由哪些系统计算的。我们的主要兴趣是确定系统的“通用”,在这个意义上,他们可以共同计算所有有限的功能。我们能够确定几个这样的类的完全同步系统。特别是,在其他结果中,我们证明了一组至少有一个机器人的所有图的普遍性,任何一组图至少有两个机器人,其商图包含任意长的路径,和任何一组图至少有三个机器人和任意大的有限围长。然后,我们专注于网络必须具有的最小尺寸,以便机器人能够计算给定有限集上的所有函数。我们能够将这种网络的最小尺寸近似为当$n$趋于无穷大时趋于2的因子。

英文摘要:

An oblivious mobile robot is a stateless computational entity located in a spatial universe, capable of moving in that universe. When activated, the robot observes the universe and the location of the other robots, chooses a destination, and moves there. The computation of the destination is made by executing an algorithm, the same for all robots, whose sole input is the current observation. No memory of all these actions is retained after the move. When the universe is a graph, distributed computations by oblivious mobile robots have been intensively studied focusing on the conditions for feasibility of basic problems (e.g., gathering, exploration) in specific classes of graphs under different schedulers. In this paper, we embark on a different, more general, type of investigation. With their movements from vertices to neighboring vertices, the robots make the system transition from one configuration to another. Viewing this transition as the computation of an abstract function, we ask which functions are computed by which systems. Our main interest is on identifying sets of systems that are "universal", in the sense that they can collectively compute all finite functions. We are able to identify several such classes of fully synchronous systems. In particular, among other results, we prove the universality of the set of all graphs with at least one robot, of any set of graphs with at least two robots whose quotient graphs contain arbitrarily long paths, and of any set of graphs with at least three robots and arbitrarily large finite girths. We then focus on the minimum size that a network must have for the robots to be able to compute all functions on a given finite set. We are able to approximate the minimum size of such a network up to a factor that tends to 2 as $n$ goes to infinity.

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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