A Markov Chain Algorithm for Compression in Self-Organizing Particle Systems

A Markov Chain Algorithm for Compression in Self-Organizing Particle Systems
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自组织粒子系统压缩的马尔可夫链算法

DOI:
10.1145/2933057.2933107
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发表时间:
2016
期刊:
PODC
影响因子:
--
通讯作者:
Richa, Andréa W.
Richa, Andréa W.
中科院分区:
--
文献类型:
--
作者:
Cannon, Sarah;Daymude, Joshua J.;Randall, Dana;Richa, Andréa W.

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我们将可编程物质视为具有有限(恒定大小)内存的简单计算元素(或粒子)的集合,这些元素(或粒子)可以自组织以解决系统范围的运动、配置和协调问题。在这里,我们专注于压缩问题,其中粒子系统尽可能紧密地聚集在一起,就像在一个球体或其等效物中存在一些潜在的几何形状一样。更具体地说,我们寻求完全分布式,本地和异步算法,导致系统收敛到一个配置与小周长。我们提出了一个马尔可夫链为基础的算法,解决了压缩问题下的几何变形虫模型,粒子系统,开始在一个连接的配置没有孔。该算法将偏置参数λ作为输入,其中λ > 1对应于有利于在粒子系统内诱导更多晶格三角形的粒子。我们证明了对于所有λ > 5,存在一个常数α > 1,使得在平稳状态下,除了指数小的概率外,粒子都是α压缩的,这意味着系统配置的周长至多是α pmin,其中pmin是粒子系统的最小可能周长。我们还证明了同样的算法可以用于λ的小值展开,特别是对于all0< λ 2,有一个常数β < 1,使得在平稳性下,除了指数小的概率外,周长至少是β pmax,其中pmax是最大可能周长。
We consider programmable matter as a collection of simple computational elements (or particles) with limited (constant-size) memory that self-organize to solve system-wide problems of movement, configuration, and coordination. Here, we focus on the compression problem, in which the particle system gathers as tightly together as possible, as in a sphere or its equivalent in the presence of some underlying geometry. More specifically, we seek fully distributed, local, and asynchronous algorithms that lead the system to converge to a configuration with small perimeter. We present a Markov chain based algorithm that solves the compression problem under the geometric amoebot model, for particle systems that begin in a connected configuration with no holes. The algorithm takes as input a bias parameter λ, where λ > 1 corresponds to particles favoring inducing more lattice triangles within the particle system. We show that for all λ > 5, there is a constant α > 1 such that at stationarity with all but exponentially small probability the particles areα-compressed, meaning the perimeter of the system configuration is at most α ⋅pmin, wherepminis the minimum possible perimeter of the particle system. We additionally prove that the same algorithm can be used for expansion for small values of λ in particular, for all0< λ < √2, there is a constant β < 1 such that at stationarity, with all but an exponentially small probability, the perimeter will be at least β ⋅pmax, wherepmaxis the maximum possible perimeter.
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