血压计中仪表放大器的设计与制作

为了检测血压测量系统中的微弱信号,采用由分立元件构成仪表放大器作为压力传感器前置放大器。运用Multsim对仪表放大器进行设计仿真,并对硬件电路安装调试。当输入信号带宽控制在10 Hz～2 kHz内,调节电位器RP可以使仪表放大器的增益可达90 dB。测试表明仪表放大器指标符合血压测量系统要求。     

Development of a piezopolymer pressure sensor for a portable fetalheart rate monitor

A piezopolymer pressure sensor has been developed for service in a portable fetal heart rate monitor, which will permit an expectant mother to perform the fetal nonstress test, a standard predelivery test, in her home. Several sensors are mounted in an array on a belt worn by the mother. The sensor design conforms to the distinctive features of the fetal heart tone, namely, the acoustic signature, frequency spectrum, signal amplitude, and localization. The components of a sensor serve to fulfill five functions: signal detection, acceleration cancellation, acoustical isolation, electrical shielding, and electrical isolation of the mother. A theoretical analysis of the sensor response yields a numerical value for the sensor sensitivity, which is compared to experiment in an in vitro sensor calibration. Finally, an in vivo test on patients within the last six weeks of term reveals that nonstress test recordings from the acoustic monitor compare well with those obtained from conventional ultrasound     

BOC Edwards @ Semicon China 2007

ATLAS为所有使用电离NF，为腔体清洗方式的CVD工艺（如，大多数的PECVD，HDPCVD，WCVD，等）提供最省钱的尾气处理管理。     

F2上安全的Edwards曲线

Edwards曲线提供了大量的可以抵挡旁道攻击的椭圆曲线,因此引起了人们特别的关注。最近Bernstein、Lange和Farashahi将一般的Edwards曲线推广到了特征为2的域上,并认为这类椭圆曲线必将会有广泛的应用。但是这类曲线的安全性却仍然是一个值得商榷的问题。文中通过双有理等价映射讨论了F2上的Edwards曲线与Koblitz曲线之间的关系,并由此推出这类Edwards曲线会在一些扩域上具有安全性。     

基于FPGA的Edwards曲线标量乘法实现方法

点加和倍点是标量乘法的基本运算。首先对原始的Edwards曲线计算公式进行了研究,再结合FPGA并行计算的特点,提出了一种适合FPGA快速实现的点加和倍点计算方法;其次给出了并行和串行两种标量乘法算法。最后在ALTERA的EP2AGX260 FPGA中分别对两种标量乘法进行了实现和测试。结果表明,该实现方法能达到较理想的效果。     

High-sensitivity miniature-sized microwave-power monitor

A light-weight pocket-sized microwave monitor for the indication of dangerous power levels received by microwave operators has been developed with considerable sensitivity by using suitable BaSrTiO3 to monitor small temperature changes of a frequency-independent Ge-film absorber.     

Respiration-movement-based sleep apnea monitor

An electronics hardware-based monitor is presented for the detection and differentiation of all forms of sleep apnea solely by the information from abdominal and thoracic excursion signals. The working of the developed monitor has been successfully tested by generating the conditions of various forms of apnea artificially.     

Ion beam co-ordinate monitor

It is shown that the co-ordinate of a continuous low-energy ion beam can be determined by measuring the angle of inclination of an elliptical pattern observed on an oscilloscope whose deflecting plates are driven directly by two noise-like signals induced by the beam on two electrostatic induction electrodes.     

基于Edwards曲线的移动RFID安全认证协议

针对传统的RFID认证协议通常难以适应移动RFID系统的问题,提出了基于Edwards曲线的适用于移动RFID系统的安全认证协议,协议采用Edwards曲线提高了其防侧信道攻击的能力,并应用椭圆曲线离散对数问题实现安全认证。进一步采用可证明安全方法给出了标签和阅读器不可跟踪隐私的安全性证明,通过安全性分析指出协议能更有效抵抗已有各种攻击。与现有的结构类似RFID认证协议相比,该协议扩展性更好,安全性和性能优于其他方案。     

高精度数字式光学膜厚监控系统

通过对光学膜厚监控系统中光路部分、电路部分以及信号处理部分的噪声分析,设计出频率稳定性良好的斩光器、低噪声光接收电路和具有较强抗噪声性能的数字式锁相放大器,从而显著地提高了系统的精度和稳定性,为提高镀膜成功率和薄膜性能创造了有利的条件。将该系统应用于镀膜系统中,实验结果证实了该系统具有较高的精度和稳定性。     

直流电机监控闭环转速系统的实现

直流电动机闭环转速系统的突出优点是在很宽的范围内通过改变PWM的占空比实现调速、快速起停、正反转控制及制动等.其组成的控制系统简单、廉价、可靠,在众多领域有着极其广泛的应用,研制一种性能稳定的直流电机驱动器具有重要的意义.介绍了RS232及SPI串行总线的通讯原理,在此基础上开发了上位机监视平台和下位机直流电机控制电路.为了便于使用,还增设人机界面.实验证明,该监控系统具有较高的数据传输速率、良好的实时性、较高的稳定性和友好的人机对话功能.     

数字温度监测器MAX6622在温度测控中的应用

介绍了精密多通道温度监测器MAX6622的特点、典型应用电路,及其软件设计.MAX6622是一款精密多通道温度监测器,可作为独立的温度监测器使用,降低了电脑内部功耗.可通过SMBus直接与电脑内部微处理器连接,由微处理器对其进行控制.采用MAX6622集成温度监测器进行温度控制设计,比传统的热敏电阻性能稳定,可靠性高.     

Edwards曲线安全快速标量乘法运算算法——EDSM

对Edwards曲线上标量乘法的安全及快速算法进行研究,首先提出新的倍点及点加公式,分析表明,其运算效率优于Edwards曲线上的已有公式;其次给出一种新的安全快速的标量乘法运算算法--EDSM算法;最后将EDSM算法与改进的Montgomery算法以及已有的安全快速算法在安全性和效率上进行比较,结果表明,EDSM算法在运算效率方面和安全性方面均有显著的提高.     

A microcomputer-based heart-rate variability monitor

A cost-effective method of on-line measurement of beat-to-beat heart-rate variability is presented. Based on a commercial microcomputer, the data is formatted as a histogram covering up to 500 past events in the form of a moving time window. Analysis of the QRS peak detector used in the instrumentation shows the conditions necessary for 1 ms resolution. The system permits the on-line calculation of statistical parameters, which are presented when a hard copy of the histogram is requested.     

性能监视与报警--提高网络的可靠性和快速响应能力

引言随着网络服务的越来越丰富,我们如何监控各服务器主机的性能是否在合理的范围内?服务器提供的服务是否在正常工作?一台计算机打开了哪些侦听端口?这些都是管理员判断内网是否安全,是否遭受攻击的重要参考依据。我们希望自己使用的网络可信可靠,并具有快速响应能力,其实这在很大程度上取决于服务器的性能与安全。