联想KD7—A主板

这款产品是由华硕公司所推出的Pentium 4主板,型号为“P4B”。主板所采用的系统芯片组为英特尔的“Intel 845”,可支持SDRAM内存、UltraATA/100的硬盘传输模式以及AC97声卡。为了提供多种用途的电源,因此在这块主板上配置了两组电源插槽。很多Pentium4的风扇固定脚座必须锁在机箱上,或者用另外的金属底板来固     

基于HL7 V3.0的医疗数据交互研究

在新医改的推动下,建立数字化"医疗联合体"和"区域医疗平台"成为医疗信息化发展的必然趋势。由于各个医疗部门的软硬件条件各异,系统开发商不同,导致多种关系数据库共存的局面。 HL7 V3.0相对于之前版本做了大量优化,本文在分析了HL7 V3.0原理的基础上,设计一个基于XML的异构医疗信息交互策略。该策略能在对已有HIS不做改动的前提下,采用外挂中间件的模式,在系统间高效、安全的处理、传输基于XML格式的HL7消息,解决异构医疗系统间数据交互的问题。     

用USB电源对超级电容器充电至7V的电路

初看来,用5V USB端口为超级电容器充电似乎是简单的事,但是要将三只超级电容充电至7V,并将输入电流限制在USB端口的最大极限500mA内,就比较困难了.     

Design and Implementation of HL7 V3 Gateway

Although the health data exchange standard of Health Level 7(HL7) V2.x (Version 2.0-2.5) has been widely used in hospital and has served well in these few years, the process that hospitals apply the standard of data transfer is very difficult. Because there is no explicit methodology in the HL7 V2.x development process, the gateway design is very complex. However, V3 strives to improve the V2 process and its outcomes. In this paper, the authors present an HL7 V3 gateway design based on the Web Services which can solve the problems of the HL7 V2.x. Web Services is an information exchange protocol regardless of the implementation pla(form, and is currently the main technology in enterprise application integration (EA1). We firstly introduce how to build HL7 V3 gateway with Web Services, then focus on the design of ilL7 gateway, finally realize the parsing and transmission of ilL7 V3 message.     

BVCBO为23V且fT为7GHz 30叉指微波功率SiGe HBT

在125mm标准CMOS工艺线上,对标准CMOS工艺经过一些必要的改动后,研制出了多叉指功率SiGe HBT.该器件的BVCBO为23V.在较大IC范围内,电流增益均非常稳定.在直流工作点IC=40mA ,VCE=8V测得fT为7GHz,表现出较大的电流处理能力.在B类连续波条件下,工作频率为3GHz时,测得输出功率为31dBm,Gp为10dB,且PAE为33.3%.测试结果表明,单片成品率达到了85%,意味着该研究结果已达到产业化水平.     

BV_(CBO)为23V且f_T为7GHz30叉指微波功率SiGe HBT

在12 5 m m标准CMOS工艺线上,对标准CMOS工艺经过一些必要的改动后,研制出了多叉指功率Si GeHBT.该器件的BVCBO为2 3V .在较大IC范围内,电流增益均非常稳定.在直流工作点IC=4 0 m A ,VCE=8V测得f T为7GHz,表现出较大的电流处理能力.在B类连续波条件下,工作频率为3GHz时,测得输出功率为31d Bm,Gp 为10 d B,且PAE为33.3% .测试结果表明,单片成品率达到了85 % ,意味着该研究结果已达到产业化水平.     

A 1 V 2.2 mW 7 GHz CMOS Quadrature VCO Using Current-Reuse and Cross-Coupled Transformer-Feedback Technology

A current-reused quadrature voltage-controlled oscillator (CR-QVCO) is proposed with the cross-coupled transformer-feedback technology for the quadrature signal generation. This CR-QVCO has the advantages of low-voltage/low-power operation with an adequate phase noise performance. A compact differential three-port transformer, in which two half-circle secondary coils are carefully designed to optimize the effective turn ratio and the coupling factor, is newly constructed to satisfy the need of signal coupling and to save the area consumption simultaneously. The quadrature oscillator providing a center frequency of 7.128 GHz for the ultrawideband (UWB) frequency synthesizer use is demonstrated in a 0.18 mum RF CMOS technology. The oscillator core dissipates 2.2 mW from a 1 V supply and occupies an area of 0.48 mm². A tuning range of 330 MHz (with a maximum control voltage of 1.8 V) can be achieved to stand the frequency shift caused by the process variation. The measured phase noise is -111.2 dBc/Hz at 1 MHz offset from the center frequency. The IQ phase error shown is less than 2deg. The calculated figure-of-merit (FOM) is 184.8 dB.     

关注商业版PGP7.O的新功能

继PGP6.*版本之后美国网络联盟公司(NAI)又推出了PGP7.0版.除了在操作界面和加密算法上做了改进外,新版PGP的突出特点是新增了Gauntlet自适应网关代理防火墙、Cyber-cop入侵检测、PGP VPN和电子商务服务器.新版PGP使该网络密码软件的功能由传统的数据信息保密上升到数据信息保密和网络系统安全两大方面,使PGP这朵绚丽的网络密码之花又添异彩.     

40 GHz electro-optic modulator with 7·5 V drive voltage

A wideband, low drive voltage LiNbO₃ electro-optic modulator is demonstrated utilising electrodes patterned according to a 13-bit Barker sequence. It exhibits a 3·5 dB optical insertion loss and a 7·5 V switching voltage. The modulation frequency response remains ⩾-5 dB (optical) to beyond 40 GHz     

一种基于车载LED的V2V通信方案

针对基于传统无线技术的V2V通信系统易产生广 播风暴、电磁干扰以及电磁辐射等问题,设计 并实现了一种基于车载LED的V2V通信方案。采用单片机为主要控制器,利用按键 电路单元将交 通信息简单快捷地编码成电信号,以车载LED发出的高速调制可见光作为信息载体,利用LED 接收 光载波信号,并通过指示灯、蜂鸣器和LCD显示电路单元完成声光报警以及文字信息显示, 实现了交通信 息的实时无线传输。实验结果表明,本文方案系统结构简单、操作方便、安全性好和抗电磁 干扰能力强,在 传输速率为0.2Mbit/s和通信距离为30m时, 误码率(BER)小于10－5,有效地克 服了传统无线通信技术的不足,是短距离无线通信技术很好的补充,具有很好的应用前景。