大中型光立方体及驱动组件建模与仿真

针对大中型光立方体系统硬件设计的繁杂性和显示控制效果因缺少模型难以验证的问题,基于平行投影原理和Proteus软件的建模技术,提出并设计了光立方体虚拟仿真模型及其通用驱动组件模型。以3D8光立方体为例进行建模,并对驱动时序和字符图案显示进行了系统仿真验证。同时,根据该建模方法设计了3D16、3D32和3D64光立方体及驱动组件,仿真验证了汉字、点云模型的显示效果。结果证明:该建模方法能较好地反映光立方体系统的软硬件工作原理,为光立方系统设计验证提供了准三维虚拟可视化方法,为大中型光立方体的多样化显示、扩展以及三维立体显示器的研究和工程应用设计等提供了模型参考。     

高度综合化航电系统对象管理模型设计与应用

针对航空电子信息系统对象建模过程存在效率低下的问题,结合高度综合化航电系统特点,采用面向对象设计思想及建模方法,分析了航电系统对象组成及相互关系,研究了系统基类设计构型,并在此基础上提出了基于虚拟表单的高度综合化航电系统对象管理模型。该模型的应用为航电系统设计研制提供了灵活、动态的管理手段,在辅助开发设计人员对系统进行面向对象建模的同时,显著提高了系统研发管理效率。     

基于输入输出数据的一体化多模型建模与控制

针对复杂非线性系统,提出了一种完全基于输入输出数据的一体化多模型建模与预测控制设计方法.首先,利用模糊空间划分对输入数据进行在线聚类;然后,采用最小二乘法在每一个聚类点处建立一个局部模型,并将模糊空间划分与多模型建模相结合,利用即时输入输出数据对局部模型的数量以及每一个局部模型的参数进行在线更新,从而实现对复杂非线性系统的在线建模;最后,在此基础上进行预测控制器的设计,将系统建模与控制器的设计包含在一个控制系统设计框架以内,对模型不确定性具有更好的鲁棒性.仿真实验的结果表明了该方法的有效性.     

舰载雷达仿真试验用态势与环境建模实施方法

针对舰载雷达仿真设计研制中仿真试验对舰载雷达目标态势和电磁环境建模的需求，提出一种舰载雷达态势环境仿真模型设计方法。通过研究舰载雷达态势环境建模的系统架构，分析了系统模型与功能、系统模型设计等基本实施要求，实际应用效果验证了该方法的有效性，可为舰载雷达态势环境建模提供实施方法技术支撑。     

基于本体和工作流的网络工程实训管理系统研究

首先分析了当前管理系统开发过程中存在的重复规划问题,然后对管理系统开发所采用的本体和工作流进行了研究。对本体建模常用的IDEF-5方法和工作流建模常用的Petri网方法进行了修改,针对网络工程实训管理系统的实际应用需要进行了本体建模和工作流建模,并在此基础上设计开发了网络工程实训管理系统。该系统开发过程中所建立的本体库在教务管理系统、学生学籍管理系统等的建立过程中具有实用价值。该系统的开发过程对管理系统建立过程中存在的重复规划问题的解决具有参考意义。     

基于Matlab/Simulink的交流异步电机矢量控制系统

着眼于讨论交流异步电机的矢量控制方法,在了解以及分析了交流异步电机的数学模型和调频控制原理的基础上,设计了一种电机的矢量控制方法以及建立模型并进行仿真。利用Matlab/Simulink的强大建模仿真功能,设计了各个功能模块,如：ACR模块、ASR模块,PI调节模块、坐标转换模块、磁通计算模块等。并且整合这些独立的模块成为一个矢量控制调速系统。仿真实验结果证明了该模型设计的合理性有效性。实验图表数据表明该建模方法能达到准确控制调速系统的要求。     

峰值电流型PWM调制buck DC-DC的建模与仿真分析

针对目前直流转直流(DC-DC)变换器系统建模方法受限于实际电路的局限性,提出了一种新型的Cadence系统建模方法。利用Cadence工具及其理想元器件,建立脉宽调制(PWM)峰值电流型buck DC-DC的系统模型。为验证模型的性能,在旺宏0.5 μm BCD工艺条件下,用电路结构替换理想模型,得到电路系统,并将其与系统模型的仿真结果进行对比。仿真结果表明,以该系统模型为指导设计的buck DC-DC芯片在340 kHz工作频率下具有宽输出电压范围,并能提供2 A的大负载电流,从而验证了该设计方法的可行性。     

基于System Generator的数字下变频设计

Xilinx公司推出的DSP设计开发工具System Generator是在Matlab环境中进行建模,是DSP高层系统设计与Xilinx FPGA之间实现的"桥梁"。在分析了FPGA传统级设计方法的基础上,提出了基于System Generator的系统级设计新方法,并应用新方法设计验证了一套数字下变频系统,通过仿真和实验结果验证了该方法的有效性和准确性。     

基于三维建模的室内景观设计系统设计

针对传统室内景观设计系统立体图像设计水平较低的问题,设计一种基于三维建模的室内景观设计系统。硬件部分通过插补器、感知器、传感器的设计实现了室内景观设计系统的动画与交互功能;通过三维视觉图像重建模块、VRLM浏览器模块的设计实现室内景观的三维重构,完成软件部分的设计。将硬件部分与软件部分结合建立基于三维建模的室内景观设计系统。为了验证该室内景观设计系统的设计水平,将该室内景观设计系统与基于ArcGIS Engine的室内景观设计系统、基于Unity3D的室内景观设计系统进行对比实验。实验结果表明,三种室内景观设计系统的立体图像设计水平分别为86.97%,46.72%,62.34%。通过比较可知,基于三维建模的室内景观设计系统的立体图像设计水平最高,证明了该系统的优越性。     

通用雷达杂波仿真系统的设计与实现

以雷达电子战系统仿真与评估为应用背景,基于信号级建模仿真方法和通用化、模块化设计思想,构建了适用于多种雷达电子战系统仿真应用的通用雷达杂波仿真系统,介绍了系统的设计与实现方法,给出了其中的关键仿真模型。该系统能够对固定平台和运动平台下雷达所接收的地/海杂波以及气象杂波进行信号级模拟。最后给出了仿真结果,验证了该系统的有效性。     

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.