【作者】 陈伟；

【导师】 杨鼎才；

【作者基本信息】 燕山大学 ， 电路与系统， 2006， 硕士

【摘要】 随着人们对网络的需求和依赖的日益增强,网络故障不仅是不方便的问题,而且可能造成巨大的社会影响和经济损失,因此对网络生存性的研究具有深远的意义。目前各种生存性定义的不同提出者都按照各自对生存性的理解和研究思路进行分析设计,缺乏固定的分析方法和判定标准。本文的研究工作主要包括以下几个方面:(1)针对人们对生存性认识不一致的现状,通过对生存性问题的深入研究,对生存性相关概念和理论做了全面而系统的分析和界定。(2)针对目前生存性定义中存在的问题,为了给生存性的分析、设计提供规范的、具有工程指导意义的定义,提出了反映生存性本质的具有过程特性的网络生存性的定义,并给出了数学描述和模型。(3)针对生存性的计算和分析还很不正式,缺乏统一的标准和固定的方法的研究现状,为了给网络生存性评估、优化和生存性网络的设计提供一个简单而有效的方法,提出了能够反映网络整个破坏过程和方式的生存性测度框架。(4)把该测度框架应用于网络生存性的分析、网络拓扑的优化和冗余设计中,设计、实现了相应的算法。(5)针对人们通常只依据单个生存性测度指标或只依据网络层次中某一层或某一部分来评价系统的生存性的现状,提出了生存性综合评估的概念,并给出了生存性综合评估的方法和模型。更多还原

【Abstract】 With the increasing requirement and dependency on networks, networkfailure is not only inconvenient but aslo may bring great social influence andtremendous economic loss. So research on survivability for networks has signif-icant meaning.Currently, researchers who have brought forward various definitions ofsurvivability do analysis and design only according to their own understandingon survivability and researching method. Hence it lacks fixed analysis methodand determinant criterion. Work of this thesis mainly includes following aspects:(1)In the light of the inconsistent understanding of survivability, this papercompletely and systemically analyzes survivability-related concepts and basicthoery.(2)Considering the problems of current definitions of survivability, in orderto provide a normal, engineering meaningful definition for the analysis anddesign of survivability, we introduce a new definition that has features ofprocess and embodies the essence of survivability, and propose the mathematicaldescription and model.(3)Currently, the computation and analysis of survivability is muchinformal and lacks uniform standards and fixed method. In order to provide asimple and effective method for the evaluation, optimization and design ofsurvivability for networks, this paper brings forward a survivability measure-ment framework that can reflect the whole network destroyed process andmanner.(4)We not only apply the framework to network survivability analysis butalso to network topology optimization and redundancy design and have design-ed and implemented the corresponding algorithms.(5)Because it is uncompletely that system’s survivability is often evaluatedaccording to single survivability measure factor or one layer or a part in thewhole network hierarchy, so we introduce the concept of survivability synth-etical evaluation and bring forward a method and model to synthetically evalu-ate the network survivability.更多还原