一个简单的有界度Yao-Yao生成器
A Simple Yao-Yao-Based Spanner of Bounded Degree
摘要:
判定单位圆盘图的Yao-Yao结构是否是一个长度不相等的图是一个长期悬而未决的问题。这个问题是高度相关的无线ad hoc网络的拓扑控制问题。在本文中,我们对解决这个问题的进展表明,姚姚结构是一个长度的UDG有界的纵横比。基于Li,Wan,Wang和Frieder提出的Yao-Sink方法,我们还提出了一种新的局部算法,称为Yao-Sparse-Sink,该算法对给定的UDG和给定的e > 0计算有界度的(1+e)-ε。Yao稀疏汇方法使得稀疏汇树的有效局部计算成为可能。最后,我们证明了UDG的所有这些结构- Yao,Yao-Yao,Yao-Sink和Yao-Sparse-Sink -具有任意大的权重。
英文摘要:
It is a standing open question to decide whether the Yao-Yao structure for unit disk graphs (UDGs) is a length spanner of not. This question is highly relevant to the topology control problem for wireless ad hoc networks. In this paper we make progress towards resolving this question by showing that the Yao-Yao structure is a length spanner for UDGs of bounded aspect ratio. We also propose a new local algorithm, called Yao-Sparse-Sink, based on the Yao-Sink method introduced by Li, Wan, Wang and Frieder, that computes a (1+e)-spanner of bounded degree for a given UDG and for given e > 0. The Yao-Sparse-Sink method enables an efficient local computation of sparse sink trees. Finally, we show that all these structures for UDGs -- Yao, Yao-Yao, Yao-Sink and Yao-Sparse-Sink -- have arbitrarily large weight.
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