船用嵌入式软件可靠性及其参数研究

对船用嵌入式软件可靠性进行了研究，结合其总体特点，分析了不同研制阶段嵌入式软件的特点，进而指出了其可靠性的特点；提出了其可靠性参数选取与确定的原则和依据，并对其可靠性参数进行了定义与计算，注意到各参数的相关性和一致性，获得了船用嵌入式软件可靠性参数体系。     

基于LPC分析的语音特征参数研究及其在说话人识别中的应用

对LPC（线性预测系数）参数及其派生参数进行了研究，重点讨论了各参数的计算方法，在此基础上提出了一种由LPC参数和语音帧能量构成的组合参数。利用GMM对20个说话人进行了闭集文本无关说话人识别实验。结果表明，与LPC参数的派生参数相比，该组合参数可以以较少的运算量取得与LPC派生参数相当的识别效果；与直接使用LPC参数相比，该组合参数能够在运算量增加不明显的情况下改进系统的性能，特别是在测试音长度较短的情况下，对性能的改进尤为明显。     

石油管材内涂层膜厚检测系统的参数辨识

针对如何提高石油管材内涂层膜厚检测系统精度，基于直射式激光三角法原理建立了光学系统模型，并运用Matlab对其参数进行优化，设计加工了一种新型小口径管材的检测系统。通过对传感器进行标定试验，应用二值化进行数据处理，确定了参数b对光学系统灵敏度影响最大，基于参数辨识进行校正确定了参数b的实际值为33.88 mm。经过试验验证，辨识出的参数b可以使测试系统的精度满足±002 mm的要求，相对于传统标定方法测量精度可提高1个数量级     

光镊光阱力计算方法的研究

介绍了一种光镊光阱力的计算方法，并对微粒在已知参数条件下所受的光阱力进行了仿真，深入分析了光阱力和与之相关的光束束腰半径、相对折射率、激光功率等系统参数的关系，对不同参数条件下的光阱力进行了讨论，从而验证了系统参数对光阱力的重要影响，此外还对电磁学模型的光阱力计算进行了阐述。     

扫描镜电机的电磁设计

为了设计以加速度最大化为目标的优化电机，分析扫描镜电机的结构特点，利用FEMM软件对扫描镜电机进行了电磁场计算与参数优化设计，根据磁场计算结果对扫描镜电机电磁参数与结构参数之间的相互关系进行分析，提出扫描镜电机设计的一般规律，通过实测数据验证了电机模型和电磁参数优化的正确性，并说明了电磁场计算模型的正确性。     

a-Si TFT OLED有源驱动阵列参数的优化与布图设计

主要介绍了用于有源驱动有机发光二极管显示屏的非晶硅薄膜晶体管阵列中各种电子器件参数的设计依据，通过理论计算，确定了单元像素中的各种器件参数；利用Aim-spice进行模拟仿真，对器件的参数进行了优化；利用L-Edit进行布图设计，完成了阵列像素的版图。该设计对小尺寸非晶硅有源驱动OLED的研究开发有一定的意义。     

低频集总参数环行器的设计分析

本文对低频集总参数环行器的等效电路进行了分析，给出其结阻抗的表达式，计算了结电感和匹配电容，对集总参数环行器的设计过程进行了阐述。     

基于非相干变极化测量技术的散射源参数估算研究

针对复杂电磁环境中独立散射源参数的估算问题，提出了一种非相干变极化接收方案，有效地获取了反映散射源信息的４个参数．研究了非相干变极化技术对散射源参数的估算能力，针对具体应用背景，构建了几种典型的散射源参数估算模型，并利用一系列数值实测对这些模型进行了验证．     

利用小波对信号进行去噪及参数估计

在以往的小波软阈值去噪的基础上对阈值进行了一定的改进，利用小波系数对信号进行了参数的估计，与其它方法相比较，该估计参数的方法能在较低的信噪比，下比较准确的计算出信号的到达时间等重要参数，满足准确性和实时性的要求。     

显示器进入工厂模式的方法

目前，显示器大多采用OSD菜单方式对各种参数进行调节，用户对参数进行调节时的操作模式称为“用户模式”。显示器出厂时，微处理器内已经存储了“用户模式”的最佳调节参数，并将一些特殊参数隐藏了起来。特殊参数只有通过特殊的方法才能调出．人们把这种只能用特殊方法才能调出参数的模式称为“工厂模式”。有时用户会在偶然情况下     

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.     

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.     

Molecular dynamics study on compressive strength of monocrystalline, nanocrystalline and amorphous Si mold for nanoimprint lithography

Molecular dynamics studies are carried out to investigate the compressive strengths and the failure mechanisms of monocrystalline, nanocrystalline and amorphous Si molds for nanoimprint lithography. The stress-strain characteristics and the stress distributions are analyzed for the three types of Si molds. The stress-strain characteristics show that the strength of the monocrystalline Si mold is the greatest among the three types of Si molds. The strength of the nanocrystalline Si mold decreases as the grain size decreases. This shows the Hall-Petch effect does not hold true in the grain size of nanometer order. The visualization of the stress distribution shows that the monocrystalline, nanocrystalline and amorphous Si mold fail due to the slipping of the specific atomic plane, the sliding in the grain boundaries and the nonlocal plastic deformation, respectively. As a result, the monocrystalline Si mold is the most suitable for nanoimprint lithography among the three types of Si molds in the nanoscale regime.     

Win 2000中USB设备客户驱动程序的开发

介绍了USB(通用串行总线)总线的特点和USB接口的数据采集系统结构组成,分析了USB协议的层次关系、每个层次的功能、协议中使用的数据格式,从W indows操作系统入手分析了WDM驱动程序的结构、W indows系统的两种工作模式(用户模式和内核模式)及其通信,举例说明USB客户驱动程序的工作流程,并介绍了应用程序如何调用驱动程序以及实测的传输速度。     

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.     

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.     

简述UPS的集成化发展趋势

随着信息技术的发展,UPS(不间断电源)系统的应用越来越广泛,系统的发展趋势是提高可用性和可靠性,实现集成化。数字化的语言、文字、图像等信息产品迅速普及,网络传输中数字接口的接入网技术的成熟,将电信网、计算机网和广播电视网融合为一的“三合一”工程已进入实质性运作阶段。在这个变化中,电源保护也经历了由点到面的转变,以及从对硬件和数据的保护扩展到对整个网络可用性的保护。为了适应这种变化的需要,UPS系统变得越来越复杂。使用者在设计和构建UPS系统过程中,以及在长期使用维护中发现,UPS设备仅仅是整个系统的一个核心环节,供电系统设计的合理性以及系统中其他环节和设备的质量,不仅会直接影响系统的可用性和供电质量,同时还直接或间接地影响了UPS设备运行的可靠性。     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Design and FPGA Implementation of Self-Tuned Wave-Pipelined Filters with Distributed Arithmetic Algorithm

Wave-pipelining enables a digital circuit to be operated at a higher frequency. In the literature, only trial-and-error and manual procedures are adopted for the choice of the optimum value of clock frequency and clock skew between the input and output registers of wave-pipelined circuits. One of the major contributions of this paper is the proposal for automating the above procedure. A second contribution is the study of how logic depths determine the superiority of wave-pipelining over pipelining with regard to power dissipation. For the study and implementation of wave-pipelined circuits, filters using the distributed arithmetic algorithm are considered. In this paper, two automation schemes are proposed for the implementation of the wave-pipelined filters on both Xilinx and Altera field programmable gate arrays (FPGAs). In the first scheme, a self-tuning finite state machine (FSM) is used to choose the clock skew and clock period for I/O registers between the wave-pipelined blocks. In the second approach, an on-chip soft-core processor is used to choose the clock skew and clock period. To test the efficacy of the schemes proposed, filters with different taps are implemented using three schemes: synchronous pipelining, sub-optimal wave-pipelining and no pipelining (i.e. using neither synchronous pipelining nor wave-pipelining). From the implementation results, it is observed that wave-pipelined distributed arithmetic (DA) filters are faster by a factor of 1.31–1.61 compared to non-pipelined DA filters. The synchronous pipelined DA filters are in turn faster by a factor of 1.73–3.27 compared to the wave-pipelined DA filters. The increased speeds are achieved in the pipelined filters at the cost of an increase in the number of slices by 15–33% and in the number of registers by 350–530%. To compare the power dissipation, both pipelined and wave-pipelined DA filters are tested by operating them at the same frequency. For medium logic depths, the wave-pipelined DA filters dissipate less power than pipelined filters. This work is carried out with the funding received from the Department of Information Technology, Ministry of information and Telecommunication, New Delhi, India.     

一种新型的代理签名方案

可识别性是一般代理签名方案的一个特点,即验证者能够从代理签名中确定代理者的身份.在一些特殊的应用中,原始签名者希望在代理签名中隐藏代理签名者身份,验证者无法从代理签名中识别代理者身份,在出现争议时,验证者能通过原始签名者揭示代理者的身份,该文提出的方案能满足这种需求.