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arXiv 0811.3176cs.DC
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自稳定数值迭代计算

Self-stabilizing Numerical Iterative Computation

Ezra N. Hoch, Danny Bickson, Danny Dolev

摘要:

传感器网络中的许多挑战性任务,包括传感器校准、节点排序、监测、事件区域检测、协同过滤、协同信号处理、{ \em等},可以用公式表示为求解线性方程组的问题。最近的几项工作提出了不同的分布式算法来解决这些问题,通常使用线性迭代数值方法。在这项工作中,我们扩展了上述方法的设置,通过添加另一个维度的问题。具体来说,我们感兴趣的{ \em自稳定}算法,连续运行,并收敛到任何初始状态的解决方案。由于网络的动态特性和测量环境的频繁变化,这方面的问题非常重要。在本文中,我们链接在一起的算法从两个不同的领域。一方面,我们使用丰富的线性代数文献的线性迭代法求解线性方程组,这是自然分布的快速收敛性能。另一方面,我们对自稳定算法感兴趣,其中计算的输入不断变化,我们希望算法从任何初始状态收敛。我们提出了一个简单的新方法称为\syncAlg作为自稳定的线性迭代法的变种。我们证明了在温和的条件下,自稳定算法收敛到一个理想的结果。我们进一步扩展这些结果来处理异步的情况。作为一个案例研究,我们讨论了传感器校准问题,并提供仿真结果来支持我们的方法的适用性。

英文摘要:

Many challenging tasks in sensor networks, including sensor calibration, ranking of nodes, monitoring, event region detection, collaborative filtering, collaborative signal processing, {\em etc.}, can be formulated as a problem of solving a linear system of equations. Several recent works propose different distributed algorithms for solving these problems, usually by using linear iterative numerical methods. In this work, we extend the settings of the above approaches, by adding another dimension to the problem. Specifically, we are interested in {\em self-stabilizing} algorithms, that continuously run and converge to a solution from any initial state. This aspect of the problem is highly important due to the dynamic nature of the network and the frequent changes in the measured environment. In this paper, we link together algorithms from two different domains. On the one hand, we use the rich linear algebra literature of linear iterative methods for solving systems of linear equations, which are naturally distributed with rapid convergence properties. On the other hand, we are interested in self-stabilizing algorithms, where the input to the computation is constantly changing, and we would like the algorithms to converge from any initial state. We propose a simple novel method called \syncAlg as a self-stabilizing variant of the linear iterative methods. We prove that under mild conditions the self-stabilizing algorithm converges to a desired result. We further extend these results to handle the asynchronous case. As a case study, we discuss the sensor calibration problem and provide simulation results to support the applicability of our approach.

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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