程控交换软件设计的一种新方法

介绍程控交换软件面向对象设计方法的原理、特点、关键技术和原型实现、重点阐述了并发对象的概念以及如何构造实时系统的并发对象模型，同时讨论对象划分、软件工程设计方法和ＣＡＳＥ工具选择等问题。     

高阶多智能体系统的一致性分析

 移动多智能体系统的一致性问题是复杂动力学系统中非常有现实意义的问题.在网络通信拓扑固定时,本文基于矩阵分解理论,提出了高阶多智能体系统中的信息流一致性收敛判据,给出了渐近收敛的充分必要条件;在通信拓扑具有最小生成树的前提下,通过构建多输入多输出系统的闭环传递函数,得到了各个阶次的状态量权重系数对收敛稳定性的影响效果,指出只要状态量权重满足Hurwitz稳定条件,即可实现一致性收敛.最后给出数值算例,仿真结果验证了结论的正确性.     

一种新的多层交换技术——标签交换

本文介绍了多层交换技术的主要代表－－标签交换技术,阐述了其基本概念、体系结构和网络构成,并概括了标签交换技术的优良特性,对将来的发展作出了分析与展望。     

基于智能体状态的虚假信息注入攻击下多智能体系统一致性跟踪

本文针对基于智能体状态的虚假信息注入攻击,本文设计了自适应容错控制协议以使得多智能体系统能在虚假信息注入攻击下实现一致性。本文首先采用径向基神经网络来近似多智能体系统中未知的非线性部分,并设计了相应的自适应律来调整神经网络的参数。然后类似这些自适应律设计了新的自适应律来近似虚假信息注入攻击的参数,并基于这些近似值设计了容错控制协议控制协议。最后利用Lyapunov稳定性定理验证了此容错控制协议的收敛性并利用Matlab数值仿真案例验证了此容错控制协议的有效性。     

一种改进的基于GMPLS多粒度光网络恢复机制

多粒度光网络(MGON)的生存性问题中增加了波带失效的故障类型,需要考虑和制定基于波带通道进行故障恢复的生存性策略.针对MGON中的节点失效提出了一种改进的基于GMPLS的共享备份恢复策略(GSR),采用故障链路源节点进行差异化恢复和共享备份恢复策略,可以减少因预留资源导致的成本.     

一种基于多QoS约束的T-MPLS恢复算法

文章在分析传统算法存在的问题的基础上,提出一种基于多服务质量(QoS)约束的传送多协议标签交换(T-MPLS)恢复算法(MQCTR);为提高恢复路径建立的成功率,结合约束路由思想,提出了基于多QoS门限约束的路由机制;以网状网为例,对算法性能进行了仿真分析.该算法不仅支持多种恢复模式,而且具备多业务区分功能,对提高运营级T-MPLS网络的生存性和健壮性具有重要意义.     

一种可靠高效的回卷恢复实现方法

本文针对现有用户级进程检查点实现中的线程挂起点不确定性问题提出一种基于线程自挂的解决方案.另外,为了降低分布式回卷恢复开销,本文提出一个多线程化的回卷恢复实现基架.基于所提回卷恢复策略,开发了一个回卷恢复试验床WINDAR.试验结果表明,多线程化实现策略能够显著提高悲观消息日志协议性能.     

一种MPLS网络的故障恢复方案

在备份路径预建立的前提下,提出了一种MPLS的故障恢复方案P(Proposal)。该方案结合了段保护和路径保护的思想,在段保护域中引入了现有的HM模型以减小Haskin和Makam的恢复时间。与此同时,减小了Lo-calreverse方案的平均时延。此外,文中扩展了现有的故障恢复的评估方案,并对建议方案进行了评估分析。实验证明,P方案具有更优的QoSP性能。     

Resonant gate driver with efficient gate energy recovery and switching loss reduction

This article describes a novel resonant gate driver for charging the gate capacitor of power metal-oxide semiconductor field-effect-transistors (MOSFETs) that operate at a high switching frequency in power converters. The proposed resonant gate driver is designed with three small MOSFETs to build up the inductor current in addition to an inductor for temporary energy storage. The proposed resonant gate driver recovers the CV² gate loss, which is the largest loss dissipated in the gate resistance in conventional gate drivers. In addition, the switching loss is reduced at the instants of turn on and turn off in the power MOSFETs of power converters by using the proposed gate driver. Mathematical analyses of the total loss appearing in the gate driver circuit and the switching loss reduction in the power switch of power converters are discussed. Finally, the proposed resonant gate driver is verified with experimental results at a switching frequency of 1 MHz.     

Reducing average delay after link failure in single-link recovery trees using distributed switching mechanism

Based on the modified MFBG algorithm, the distributed switching mechanism (DSM) is proposed to reduce the average delay after link failure in the preplanned single-link recovery trees. The main principle of the DSM is to use as many links in the blue tree as possible to keep connected, and the key feature is that all the active links comprise a new spanning tree after distributed switching. Simulation results demonstrate the effectiveness of the DSM in reducing the average delay.     

泵浦探测法测量染料分子基态恢复时间的研究

本文对泵浦探测法测量染料分子基态恢复时间进行了分析,对以往的结论作了修正。提出用锁模脉冲串激发获得单个脉冲测量结果的方法。测量了BDN染料在不同溶剂中的基态恢复时间。     

Distributed object‐oriented switching system software platform design

Key technologies are presented and evaluated for establishing a distributed object‐oriented switching system platform. This platform is based on CORBA, which can enhance software productivity and system scalability and is thus widely used in the information technology field. Conditions and requirements specific to switching systems, such as very high‐performance and non‐stop operation, are analysed and mapped to the main elements of CORBA. How to deploy and bind objects so as to minimize the processing load is clarified. Mechanisms that guarantee system reliability (saving calls in service when a system failure occurs and avoiding the spread of faults) are also presented. Evaluation of the number of dynamic program steps for systems using fully compliant CORBA, improved CORBA, and a proprietary high‐speed object‐request broker (ORB) shows that constructing a communication switching system by using the high‐speed ORB approach is sufficient, but CORBA‐compliant approaches should be used to provide an interoperable interface for communicating with external compliant systems. Copyright © 2001 John Wiley & Sons, Ltd.     

BDN染料的锁模特性和基态恢复时间

本文报道了国产BDN染料的碘乙烷溶液、吡啶溶液和二甲亚砜溶液的锁模特性和基态恢复时间。     

Extended selection of switching target faults in CONT algorithm for test generation

We describe an extended selection of switching target faults in the CONT algorithm. The main difficulty in test generation is the conflict that arises in the process of determining the signal values due to reconvergent fanouts. Conventional approaches for test generation change a signal value, which causes conflicts to another possible choice for backtracking. In the CONT algorithm, a strategy of switching target fault was proposed as a new backtracking mechanism. In this method, the target fault is switched to a new target fault instead of making an alternative assignment on the primary input value when a conflict occurs. A disadvantage of the CONT algorithm is that unjustified lines exist in the process of test generation. These unjustified lines make the procedure of switching targets complicated and restrict the possible choice in selecting the new target fault. In the new version of CONT, called CONT-2, we have removed the unjustified lines in the process of test generation and have extended to two target-fault types for switching targets. Implementing CONT-2 by a Fortran program, ISCAS85 benchmark circuits are examined. Experiments on a combined system with fault simulation followed by CONT-2 are also presented.     

Search strategy switching: A cost model and an analysis of backtracking

Test generation algorithms contain search strategies which are used to control decision making when the algorithm encounters a choice of signal value, or what action to perform next. Our study of traditional search strategies used in automatic test pattern generation has led us to the observation that no single strategy is superior for all faults in a circuit and all circuits. Further experimentation led to the conclusion that a combination of search strategies provides better fault coverage and/or faster ATPG for a given backtrack limit. Instead of using just one strategy up to the backtrack limit, a primary strategy is used for the first half of the backtrack limit, then a secondary strategy is used for the second half of the backtrack limit. This article presents a qualitative ATPG cost model based on the number of test generation events, uses this model to explain why search strategy switching is faster, and shows experimental evidence to verify both the cost model and search strategy switching theory. The experiments were performed with the ISCAS circuits and our implementation of the FAN algorithm.     

APON系统保护倒换策略的探讨

由于用户对宽带业务的需求逐步增长,传统的模拟接入网正在向数字化的高速宽带网络过渡,其中基于ＡＴＭ的无源光网络（ＡＰＯＮ）又是接入网研究中的热点。本文先介绍ＡＰＯＮ的基本概念和特点,然后在此基础上对ＡＰＯＮ系统应采取的保护倒换方式进行分析,并给出了几种保护倒换结构的配置形式。     

光突发交换网络中新型减小竞争冲突方案

光突发交换是下一代光网络中的有效核心交换技术之一,在光突发交换网络中数据突发的调度是影响交换性能的重要因素,如何有效地对数据突发进行合理调度,以减小丢包率正是关键问题所在.采用在波长域业务整形与边缘节点延迟调度相结合的方法对数据突发进行调度,与LAUC-VF算法进行仿真对比分析,该方法能有效地降低突发包丢失率.