引体向上测试系统的设计与实现

引体向上作为人体臂力和耐力素质的体现,对其进行测量,可改变传统的人工计数,并通过引体向上测试系统直接对其进行记录和分析,从而实现运动的信息化、自动化。本文以LPC2132作为主控,以RS485作为通信接口,通过设计,同时搭载外设的光学传感器,实现了引体向上测试系统。     

基于A567进行运算放大器DC参数测试技术研究

运算放大器作为一种通用器件，其测试技术比较成熟。为快速解决在测试过程中出现的问题，需对测试系统内部参数测试实现方式做深入了解。本文将以teradyne公司的混合信号测试系统A567为例，对运算放大器的测试理论及技术进行了分析，并提出了一种新的测试实现方式。     

基于虚拟仪器的程控信号源远程控制

为了实现对GPIB程控信号源远程控制的目的,组建一个虚拟测试系统。该测试系统,采用虚拟仪器技术,以LabWindows/CVI作为软件开发平台,以GPIB标准总线仪器与计算机作为硬件平台,使用装有GPIB接口卡计算机,将计算机与程控信号源通过总线连接起来,组成程控信号源为主的虚拟仪器模块,仪器模块的硬件功能通过软件开发实现;采用VISA方式编程,直接用VISA语句编写程控仪器指令,脱离仪器驱动程序,对GPIB总线设备可以相互兼容使用。该测试系统实现了对程控信号源的数据远程收发和功能设置。     

一种基于C8051F350的无线同步数据采集方法

设计了一种以C8051F350作为核心控制器,并配以无线通信模块的数据采集系统。介绍了系统无线数据传输中软件同步的设计及相关的处理,提出了一种通过多次测试、计算,获得数据在无线传输过程中产生的时间差,进行时间补偿后实现系统同步数据采集的方法。通过对同一信号进行多次测试,证明了该方法实现了数据的同步采集,为歼击机操纵杆／舵操纵力一位移性能检测评估系统提供了准确的测量数据。     

CAN总线在家庭智能化控制系统中的应用研究

家庭智能控制系统主要是实现对家庭智能终端设备进行的远程控制。对CAN总线在家庭智能化控制系统中的应用进行了探讨性研究,以GEFANUC系列90PLC为例,用单片机AT89C52微处理器作为中间桥梁,与用SJA1000作为CAN微控制器一起共同构建控制性局域网,并通过仿真系统的测试,实现对家庭智能设备的实时控制。     

基于NIOSⅡ的CPU调试系统设计技术研究

对基于FPGA的CPU设计,研究了其调试系统的设计和实现.运用TestBench测试理念和设计思想,采用IP软核和自定义Avalon外设技术,以NIOS Ⅱ软核作为控制核心,实现了对基于FPGA的CPU设计进行调试的功能.     

基于ARM的大容量并行通信数据采集处理系统

针对大规模芯片测试中对数据采集高精度、高速率、大容量的要求,文中提出了一种基于ARM的大容量并行通信数据处理系统设计方案。该系统以STM32F767作为主控芯片,六通道的AD7656芯片作为模拟数字(A/D)转换芯片,芯片间采用并行通信,实现了多个通道并行模数转换,通过扩展SDRAM,实现了大容量数据存储。文中介绍了硬件设计、工作原理以及软件编程的实现方法,最后以安捷伦B1500A半导体分析仪为参照,通过直流测试和交流测试验证了系统的测试精度和可靠性。结果证明,该系统可实现32MB的数据存储,经过校准后电压测试精度可以小于0.5mV,电流测试精度可以达到1μA。     

基于Web的网盘系统的设计与实现

为了实现文件的网络存储和管理,本文提出了一种基于Web的网盘系统并进行实现.该系统采用JSP开发用户操作界面并采用MySQl作为数据库.普通用户通过浏览器可以访问该系统并对文件进行管理,管理员则对用户信息进行管理,并对其数据进行审计.系统还采取了必要的安全措施,保证了用户的数据安全.经过测试,该系统能在提供可靠性的安全环境下有效的实现用户数据的远程管理.     

基于FPGA多路机载冗余图像处理系统的设计与实现

采用以FPGA作为核心处理器,实现了对多路DVISL频冗余信号的解码、编码、实时处理以及输出显示,并且信号通道增加冗余设计,因而加强了系统的稳定性和可靠性。电路设计简洁,具有较强的灵活性和扩展性。通过实际测试结果表明,系统能够流畅地对1600×1200分辨率,60Hz．gq新率,24位真彩色的高清视频进行实时处理,其系统可靠、稳定,实用性强。     

虚拟仪器在位移测试系统中的应用

随着位移测试系统日益复杂的发展和虚拟仪器的应用扩大化,文中以虚拟仪器作为技术平台,利用Lab-VIEW软件编写程序,设计液压系统位移测试系统。介绍测试系统的硬件组成及设计过程,给出其编写的程序框图和直观的前面板图,系统具有很强的可扩展性,该测试系统可以实现位移信号的数据采集、传送、存储、调用、分析和显示。并且通过现场试验表明此系统具有较强的实用性、可靠性和操作方便。能够满足教学、工业的需要。     

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.     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks