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arXiv 1408.0409cs.DS
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顶点容错加法生成器

Vertex Fault Tolerant Additive Spanners

Merav Parter

摘要:

网络的{ \em容错}结构需要在网络的某些边或顶点发生故障后继续运行。在本文中,我们解决的问题,设计一个{ \em容错}的添加剂,即,一个子图$H$的网络$G$,使以下故障的一个单一的顶点,$H$的幸存部分仍然包含一个\emph{additive}的$G$(的幸存部分),满足$dist(s,t,H\setminus \{v\}) \leq dist(s,t,G\setminus \{v\})+β$的每一个$s,t,v \in V$。最近,Braunschvig等人考虑了构造对高达$f$ \emph{edges}的失效有弹性的容错加性空间的问题。处理\emph{vertex}故障的问题在其中没有解决。在本文中,我们提出了新的技术,以建设可加FT-空间克服失败的一个单一的顶点在图中。我们的第一个结果是一个FT-可加性拉伸$2$和$\widetilde{O}(n^{5/3})$边缘。我们的第二个结果是具有附加拉伸$6$和$\widetilde{O}(n^{3/2})$边缘的FT-100。该构造算法由两个主要部分组成:(a)构造FT聚类图和(b)应用适当采用故障倾向设置的修改后的路径购买过程。最后,我们还描述了两个构造{ \em容错多源加性空间},旨在保证一个有界的加性拉伸后的顶点故障,对于每对$S \times V$的源$S\subseteq V$的一个给定的子集的顶点。我们构造的加法拉伸边界是4和8(使用不同数量的边)。

英文摘要:

A {\em fault-tolerant} structure for a network is required to continue functioning following the failure of some of the network's edges or vertices. In this paper, we address the problem of designing a {\em fault-tolerant} additive spanner, namely, a subgraph $H$ of the network $G$ such that subsequent to the failure of a single vertex, the surviving part of $H$ still contains an \emph{additive} spanner for (the surviving part of) $G$, satisfying $dist(s,t,H\setminus \{v\}) \leq dist(s,t,G\setminus \{v\})+β$ for every $s,t,v \in V$. Recently, the problem of constructing fault-tolerant additive spanners resilient to the failure of up to $f$ \emph{edges} has been considered by Braunschvig et. al. The problem of handling \emph{vertex} failures was left open therein. In this paper we develop new techniques for constructing additive FT-spanners overcoming the failure of a single vertex in the graph. Our first result is an FT-spanner with additive stretch $2$ and $\widetilde{O}(n^{5/3})$ edges. Our second result is an FT-spanner with additive stretch $6$ and $\widetilde{O}(n^{3/2})$ edges. The construction algorithm consists of two main components: (a) constructing an FT-clustering graph and (b) applying a modified path-buying procedure suitably adopted to failure prone settings. Finally, we also describe two constructions for {\em fault-tolerant multi-source additive spanners}, aiming to guarantee a bounded additive stretch following a vertex failure, for every pair of vertices in $S \times V$ for a given subset of sources $S\subseteq V$. The additive stretch bounds of our constructions are 4 and 8 (using a different number of edges).

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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