平面锥形光波导模斑转换器的研究

基于三维有限差分束传输法（FD－BPM）对平面光波导器件中的关键元件之一－平面锥形模斑转换器作了深入的研究，对线性和数种非线性侧面边界的模斑转换器进行了数值仿真和对比，分析了平面锥形模斑转换器侧面边界函数对耦合损耗的影响，以及模斑转换器中模场分布随传输距离的变化，确定了不同长度的平面锥形模斑转换器的最佳侧面边界，指出长度在200－1000μm范围内具有余弦边界的平面锥形模斑转换器性能最佳，并且发现，光纤中的出射光进入模斑转换器以后，光波模式会逐渐发生变化，并最终转化为单模。     

基于DSP的心电监护仪的设计

介绍了一个以DSP芯片为核心的心电监护系统。该系统实现了DSP代替PC，系统体积小，并具有较大容量的存储能力，而且采用了混沌的分析方法——分数维值(FD)对信号进行了分析。     

Ho∞-based fault detection for nonlinear networked systems with random packet dropout and probabilistic interval delay

The fault detection problem for the nonlinear networked control system (NCS) with packet dropout and delay is investigated.A nonlinear stochastic system model is proposed to account for the NCS with random packet dropout and networkinduced non-uniformly distributed time-varying delay in both from sensor to controller (S/C) and from controller to actuator (C/A).Based on the obtained NCS model,employing an observer-based fault detection filter as the residual generator,the addressed fault detection problem is converted into an auxiliary nonlinear H∞ control problem.Then,with the help of Lyapunov functional approach,a sufficient condition for the desired fault detection filter is constructed in terms of certain linear matrix inequalities,which depend on not only the delay interval but also the delay interval occurrence rate and successful packet communication rate.Especially,a trade-off phenomenon between the maximum allowable delay bound and successful data packet transmission rate is found,which is typically resulted from the limited bandwidth of communication networks.The effectiveness of the proposed method is demonstrated by a simulation example.     

H_∞-based fault detection for nonlinear networked systems with random packet dropout and probabilistic interval delay

The fault detection problem for the nonlinear networked control system(NCS) with packet dropout and delay is investigated.A nonlinear stochastic system model is proposed to account for the NCS with random packet dropout and networkinduced non-uniformly distributed time-varying delay in both from sensor to controller(S/C) and from controller to actuator(C/A).Based on the obtained NCS model,employing an observer-based fault detection filter as the residual generator,the addressed fault detection problem is converted into an auxiliary nonlinear H∞ control problem.Then,with the help of Lyapunov functional approach,a sufficient condition for the desired fault detection filter is constructed in terms of certain linear matrix inequalities,which depend on not only the delay interval but also the delay interval occurrence rate and successful packet communication rate.Especially,a trade-off phenomenon between the maximum allowable delay bound and successful data packet transmission rate is found,which is typically resulted from the limited bandwidth of communication networks.The effectiveness of the proposed method is demonstrated by a simulation example.     

fuzzy计算机的设计思想（Ⅰ）

论述ｆｕｚｚｙ计算机的设计思想；介绍ｆｕｚｚｙ计算机的总体结构，依次讨论组成ｆｕｚｚｙ计算机的几大关键部件，诸如ＦＤ转换器、知识包、思维处理器等等。特别提出基于ｆｕｚｚｙ集理论的数值计算问题，有希望开辟出数值计算的一个新领域──ｆｕｚｚｙ计算。     

融合子带方差和FD变换的长记忆过程仿真

根据长记忆过程小波变换的频带分割及其去相关性，提出了“子带方差”的概念，并给出了在长记忆条件下的估算公式。在此基础上，构造了一种具有扩展记忆功能的FD变换，该变换可以将一个无记忆的、独立同分布的随机序列转化为具有指定长记忆特性的随机序列，由此实现对长记忆过程的仿真。对仿真序列进行模型比较和参数估计证实，基于子带方差的FD变换可以有效地扩展和控制随机序列的记忆性。     

关系数据模式中属性集闭包和FD集闭包的性质

本文主要给出了关系模式中两个重要概念——属性集闭包及ＦＤ集闭包的若干性质及其相互关系．     

FD-TD Analysis of Electromagnetic Wave Scattering by Infinite Periodic Structure

ＦＤＴＤＡｎａｌｙｓｉｓｏｆＥｌｅｃｔｒｏｍａｇｎｅｔｉｃＷａｖｅＳｃａｔｅｒｉｎｇｂｙＩｎｆｉｎｉｔｅＰｅｒｉｏｄｉｃＳｔｒｕｃｔｕｒｅＣｈｅｎＢｉｎ，ＦａｎｇＤａｇａｎｇ＆ＹａｏＰｉｎｇＮａｉｊｉｎｇＵｎｉｖｅｒｓｉｔｏｆＳｃｉｅｎｃｅａｎｄ...     

分数布朗运动的子波变换及其对H参数的估计

本文将子波变换应用于分数布朗运动的分析,证明了分数布朗运动的子波变换是一个平稳过程的结论,提出了利用子波变换估计分数布朗运动的H参数的两种方法,这些方法与分析子波无关,可利用快速子波变换来实现.     

等离子体覆盖单极子天线的FDTD分析

该文运用频依时域有限差分（（FD）2TD）方法对附有介质隔离层的等离子体覆盖的单极子天线进行分析.借助一般色散媒质的时域有限差分（FDTD）公式,推导出适用于等离子体的差分公式.通过添加介质隔离层,并引入适当的校正,避免等离子体频率远高于信号频率时短路情况的发生,并略为减小了等离子体对天线谐振频率造成的偏移.不同频率的等离子体对有/无介质隔离层的单极子天线回波损耗的计算结果表明：等离子体频率越大,对单极子天线的反射电压波形的影响、造成的谐振频率的偏移就越大.