基于HBF神经网络的自适应观测器

传统的RBF(Radial Basis Function)神经元基函数通常把高斯类型与单一宽度作为每个神经元的激活函数,这些特性限制了网络神经元的性能,特别是在处理复杂的非线性建模问题上.为了克服这个限制,本文应用了具有类似RBF网络,但激活函数不同-超基函数HBF(Hyper Basis Function)的网络.结合RBF网络,分析了HBF网络的结构、基函数形式及基函数对网络的影响,利用决策树算法计算了网络中心.在此基础上,提出了一种基于HBF神经网络的自适应观测器设计方法,并通过引入Lyapunov函数,证明了这种观测器设计方法的稳定性;最后通过仿真验证了这种HBF神经网络观测器能很好地观测系统的状态值.     

基于双Sigmoid小波混沌神经网络的盲检测算法*1

接要:针对在盲检测环境中暂态混沌神经网络的缺陷,提出了基于双Sigmoid小波混沌神经网络的盲检测算法,构建了新网络的模型和能量函数,并分别在同步和异步更新模式下证明了该网络的稳定性.新网络的设计思想体现在:采用墨西哥帽小波函数和Sigmoid函数的组合作为网络的激励函数,再为每个神经元加一个激活函数构成双Sigmoid.仿真表明:由于小波函数较强的逼近能力以及双Sigmoid快速收敛的特性,提出的算法显著地提高了网络的全局寻优能力和寻优精度.     

基于小波神经网络的惯性导航系统故障检测原理

本文首先介绍了小波神经网络原理,它是将规范正交的小波函数作为基函数网络中的基函数,得到了所谓的小波神经网络。然后介绍了惯性导航系统的故障分析及分类,最后提出了一种基于小波神经网络的非线性观测器的故障检测方法,它是将小波神经网络离线学习和在线学习相结合,获取惯性导航系统输入输出的非线性动力学特性,进而从实际输出与小波神经网络的估计输出中得到预报误差,把它作为残差进行逻辑判决。     

模糊小波神经网络控制器在隧进殉爆控制系统中的应用

采用模糊小波神经网络控制器对隧进殉爆系统进行控制,快速、准确、安全地排除机场未爆弹.模糊小波神经网络控制器采用小波函数作为模糊隶属函数,将模糊控制与神经网络相结合进行模糊推理.利用遗传算法全局搜索的特点,对神经网络参数进行离线优化;然后利用参数自调整的自主适应环境变化能力,对网络参数进行在线调整.实验结果表明:设计的控制器具有良好的鲁棒性,可以保证隧进殉爆系统在未爆弹弹道中顺利前行.完成未爆弹排除任务.     

基于神经网络和维纳滤波的半盲离焦图像复原

本文提出了一种基于小波神经网络和维纳(Wiener)滤波的半盲离焦图像复原算法,首先提取训练图像的小波域特点参数向量,将该参数用来训练小波神经网络,利用训练好的网络估计图像离焦模糊参数.由离焦模糊参数获得点扩展函数,然后用Wiener滤波完成图像的复原.实验结果表明:该方法能有效地估计离焦模糊参数和复原模糊图像.     

无人机模糊小波神经网络轨迹线性化控制

针对系统存在不确定和有界干扰的情况,提出了一种基于模糊小波神经网络的轨迹线性化控制方法。利用模糊小波神经网络对非线性函数的逼近能力,减小不确定干扰对系统的影响,并与轨迹线性化方法结合设计了无人机飞控系统控制器。采用Lyapunov稳定性理论,证明了在所设计的控制器下,闭环系统所有信号一致最终有界。最后对系统存在不确定的情况下进行了仿真,并与没有加模糊小波神经网络的轨迹线性化控制器进行了对比,仿真结果证明了所提方法的有效性和鲁棒性。     

一种模糊小波神经网络辨识器的设计与应用

针对现有模糊神经网络的语言变量层隶属函数的不足,借鉴小波变换良好的尺度变换和伸缩平移特性,提出了一种新的模糊小波神经网络模型,并研究了其结构和相应的优化算法.将该模糊小波神经网络作为系统辩识器进行计算机仿真,仿真结果表明所研究的模糊小波神经网络结构及其学习算法简单有效,系统辩识准确.     

模糊神经网络控制的混合小波神经网络盲均衡算法

针对传统恒模算法(CMA)收敛速度与均方误差之间的矛盾,提出了模糊神经网络控制的混合小波神经网络(FHWNN)盲均衡算法.该算法在小波神经网络输入层之前级联一个横向滤波器,将横向滤波器的节点输出分为实部和虚部两路经过小波神经网络后再合成为一路复数信号;利用模糊神经网络(FNN)设计的模糊规则控制小波函数的尺度因子和平移...     

小波神经网络训练研究及在织物预测中的应用

针对小波神经网络训练不便的问题,构造了一种基于MATLAB神经网络工具箱的训练方法。首先通过公式推导简化了小波神经网络的学习参数,将伸缩因子和平移因子变换到了权重和阈值中。然后根据神经网络工具箱对激活函数的要求,采用MATLAB编制了适用于神经网络工具箱的小波基激活函数,简单描述了编写自定义激活函数的方法。最后将该小波神经网络应用于织物的热阻和湿阻预测中,采用贝叶斯正则化训练算法,取得了较好的效果。     

一类非线性系统的单尺度小波框架 网络自适应观测器

本文提出了一类MIMO非线性系统的小波网络自适应观测器设计方法,可对一类非线性未知或具有不确定性的非仿射系统进行状态估计.文中给出了小波网络参数的在线自适应调节律,从理论上分析了观测器增益矩阵的选择对状态估计误差的影响.根据Lyapunov理论证明了整个自适应观测器的稳定性,仿真试验表明了该方法的有效性.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.