R150系统在原油稳定站中的应用

Ｒ１５０是ＨＯＮＥＹＷＥＬＬ公司最新推出的模块式自动化控制系统。本文介绍了Ｒ１５０系统的构成特点及其在原油稳定站中的应用情况。     

ERIPAX的帧中继业务

ＥＲＩＰＡＸ是爱立信的分组交换数据网路系统。第一个系统于１９８３年投入使用，今天３５个国家的１５０个用户在使用ＥＲＩＰＡＸ网路．本文介绍了ＥＲＩＰＡＸ及其应用，讨论该系统目前及将来的发展；改进了的分组交换业务及引入称为帧中继的新通信业务。     

精品展台

●半导体和ＩＣ３２ＫｂＴＩＭＥＫＥＥＰＥＲＭ４８Ｔ３７Ｙ查询号１５０Ｍ４８Ｔ３ＴＹ采用节省空间的ＳＮＡＰＨＡＴ外壳封装，Ｍ４８Ｔ３７Ｙ提供了ＳＴ先进的ＴＩＭＥＫＥＥＰＥＲ（计时器）的所有功能（例如Ｍ４８Ｔ５６Ｙ），并且提供监控定时器、电源开关复位、可...     

NetFRAME公司推出超级网络服务器并获大奖

美国ＮｅｔＦＲＡＭＥ公司发布其ＮＦ８５００系列中的两款新品ＮＦ８５７０和ＮＦ８５９０。它们是基于ＩｎｔｅｌＰｅｎｔｉｕｍ１５０ＭＨｚ多ＣＰＵ技术（４路ＳＭＰ），标准内存、硬盘均为Ｐｅｎｔｉｕｍ１００ＭＨｚ产品的１．５倍。ＮＦ８５９０服务器中的称为“Ｎｏｔｅｓ信息集群服务器”的配置为：ＮｅｔＦＲＡＭＥＰｅｎｔｉｕｍ１５０ＭＨｚＣｌｕｓｔｅｒＳｅｒｖｅｒ８５９０；ＭｉｃｒｏｓｏｆｔＮＴＳｅｒｖｅｒ３．５．１；ＬｏｔｕｓＮｏｔｅｓ４．０。目前，单台ＮｅｔＦＲＡＭＥＮｏｔｅｓＭｅｓｓａｇｅＣｌｕｓｔｅｒ…     

DDR存储器和DDR DIMM

就 像我们越来越熟悉Ｒａｍｂｕｓ和 ＰＣ１３３一样,一个新的名词—一ＤＤＲ出现在我们面前。什么是ＤＤＲ？简单的回答就是“双数据速率同步ＤＲＡＭ。它以两倍的速度传输数据。”那么,它究竟是怎样一种技术呢？ ＤＤＲ的历史 １９９７年,我们在ＪＥＤＥＣ存储器会议上第一次看到了配备ＤＤＲ内存的ＰＣ。那时,ＤＤＲ内存只由Ｓａｍｓｕｎｇ制造和推广。主板上的芯片组是ＤＤＲ可选的ＶＩＡＭ３。其数据传输速率为１５０ＭＨｚ。不幸的是,此主板只工作了两个小时。 虽然第一块带有ＤＤＲ内存的主板工作得并不很好,但是它给了半导体…     

电子部七所特别推介ET—150无线寻呼发射机

电子部七所特别推介ＥＴ—１５０无线寻呼发射机无线寻呼发射机是无线寻呼系统总台的核心设备之一，为满足日益增长的市场需要，广州通信研究所十八室自行开发生产了ＥＴ—１５０无线寻呼发射机，为发展我国的移动通信事业增添了一项国产设备。ＥＴ—１５０发射机与国产其...     

索尼推出DVCAM和DV格式切换摄像机

索尼公司近日推出了面向专业人士的ＤＳＲ－ＰＤ１５０摄像机。ＤＣＲ－ＶＸ２０００是ＣＲ－ＶＸ１０００后续机种,采用ＤＶ格式记录,面向一般消费者。ＤＳＲ－ＰＤ１５０则是在ＤＣＲ－ＶＸ２０００的基础上,面向专业人士而开发的机种,它在摄像时能够进行ＤＶＣＡＭ和ＤＶ格式切换。ＤＳＲ－ＰＤ１５０采用了５８ｍｍ的大口径镜头,搭载了新开发的１／３英寸３ＣＣＤ。因此,其感光性能是ＣＲ－ＶＸ１０００的两倍,图像污点为ＣＲ－ＶＸ１０００的１／３。图像信噪比也很好,水平清晰度达到５３０条。此外,它还有一个特征：和ＤＣＲ…     

NEXUS双向寻呼和定位的实现

１ＴＷＡＧＥＲ始发消息ＴＷＡＧＥＲ发送存储的消息，可以是ＴＷＡＧＥＲ的回应或是ＴＷＡＧＥＲ始发的消息。这些消息可以被系统发送到不同的目的地：电话、Ｅｍａｉｌ、邮箱、单向寻呼机、另一个ＴＷＡＧＥＲ等。１１始发消息的过程从ＴＷＡＧＥＲ始发消息的流程是...     

计算机串行通信综述

本文着重向读者介绍目前流行的几种计算机串行通信规程，它们是ＥＩＡ－ＲＳ－２３２Ｃ、ＥＩＡ－ＲＳ－４２２Ａ、ＥＩＡ－ＲＳ－４２３Ａ、ＥＩＡ－ＲＳ－４４９、ＥＩＡ－ＲＳ－４８５、ＡＲ－ＩＮＣ－４２９等。     

5ESS例测程序的运行设置

本文介绍了ＡＭＲＥＸ，ＣＭＲＥＸ，ＳＭＲＥＸ，三种５ＥＳＳ交换机的例测程序的运行经验。     

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.     

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.     

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.     

Towards Mobile Ubiquitous Service Environment

In this article we present a perspective on future vision of mobile communications and services which is referred to as Mobile Ubiquitous Service Environment (MUSE). Based on analysis of wireless communications and services, we exploit a conceptual model for MUSE via a top-down approach. The conceptual model consists of three major elements: Terminal Service Environment (TSE), Network Service Environment (NSE) and User Identity (UID). The concept of Always the Best Experience (ABE) is addressed as the hinge in design and development such that the user-centric services could be provided automatically and intelligently in the future diverse wireless world Based on these, we further discuss the issues on design and implementation of architecture of future wireless communication system. Requirements for architecture brought by the new features of MUSE are listed. Moreover, we also address several tradeoffs that should be taken into consideration in design. Finally, the deployment challenges for MUSE, such as reflectiveness of system, security and privacy, as well as peer-to-peer AAA are predicted.Ji Yang received PhD degree on Circuit and System, Bachelor degree on Telecommunication Engineering from Beijing University of Posts and Telecommunications (BUPT) in 2002 and 1993 respectively. Currently, he is an associate professor of BUPT, chief technical supervisor of Wireless Technology Innovation Institute, and vice manager of MTlab of Sino-Germany Software Institute. He leads the research on service and application in Future Forum in China. He also made much contribution to the China Communication Standardization Association (CCSA), including the vision of future Mobile Ubiquitous Service Environment, architecture of future B3G mobile terminal, etc. His research interests include architecture design for mobile ubiquitous networks, theory of self-organization, etc.Zhang Ping is now the professor of Beijing University of Posts and Telecommunications and director of Wireless Technology Innovation (WTI) Institute, BUPT. He has also served on the senior member of C3G Group, China MOST 863 future mobile communication FuTURE project, vice-chairman of China FuTURE Forum, and member of Vision Committee of World Wireless Research Forum(WWRF), he was vice chair of WWRF in 2005. He is also invited as the consultants for many domestic and oversea communication companies. He is very active on the international research activity on Beyond 3G area. He also participated in several European projects such as E2R and MOCCA. Until now, he has published 6 books, around 400 publications in journals and conferences in the area of telecommunications. His main research interests are theory and applications in wireless communication area. He was awarded by government, city of Beijing and Ministry of Information Industry several times for his great contribution to the industry and research activity in China.Hu Zheng is a PH.D candidate in mobile communications engineering in Wireless Technology Innovation Institute (WTI) at Beijing University of Posts and Telecommunications (BUPT). He received B.S degree from Nanjing University of Posts and Telecommunications in 2002, majoring in computer communications engineering. He currently works on serivce aspects of mobile ubiquitous communication system with focus on design and performance evaluation of interaction protocols and services in self-organized service environment.Wang Xu received the B.Tech. degree in electronic engineering from Beijing Polytechnic University (now named as Beijing University of Technology), Beijing, China, in 2002. Now he is working for his Ph.D. degree in Wireless Technology Innovation (WTI) Institute, Beijing University of Posts and Telecommunications (BUPT). His current interests include wireless communications in personal area, ad hoc networks and peer-to-peer system.Li Yinong received the BS degree major in Telecommunication Engineering in 1993 from Beijing University of Posts and Telecommunications, the MS degree and PhD degree major in Telecommunication and Electronic System in 1995 and 2003 from the Beijing University of Posts and Telecommunications. He is currently a lecture of STE (School of Telecommunication Engineering) of BUPT. His main research interests include service modeling, service composition approach, and intelligent service. In BUPT, he has given several lectures to both graduate and undergraduate students such as Information Theory, Speech Recognition, Pattern Recognition and Artificial Intelligence.     

High Speed Curve Interpolating D/A Converter

This paper presents a design of high speed curve interpolating D/A converter. We improve 8-bit data to 12-bit data, so the data resolution increases 16 times than that of original 8-bit data. The curve interpolator is developed from the linear interpolator. The simulation speed curve interpolator is about 500 MHz. The chip is fabricated by 0.8 m double-metal single poly CMOS technology. The active interpolation size of chip is 1 × 1 mm². The power dissipation is 200 mWatts at 5volt and 500 MHz for simulation result and 80 mWatts at 5 volt and 50 MHz for measurement result. The errors of interpolating result of curve interpolators are about 20 times less than that of original signal.     

Modulation instability of dispersion-shifted fiber couplers

The nonlinear coupled-mode equations are rewritten by even and odd modes. We study modulation instability (MI) of dispersion-shifted fiber couplers when either even or odd mode is launched alone by using zero-dispersion waveleng threlatively long (quasi-cw) pulses. The result shows that there are new types of MI in both the normal-dispersion and the anomalous-dispersion regimes. MI is concerned with forth-order dispersion and has no relation with third-order dispersion.Quasi-cw can be changed into pulses array under certain conditions. We can extract super short pulse from this. Furthermore,the bandwidth of gain spectra widens and its strength accretes as the input power increases.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

Experimental study of interband and intraband crosstalk in WDM networks

The impacts of interband and intraband erosstalk are studied and compared experimentally. Results show that interband crosstalk can be removed with narrow-band filters and has no influence on signal. Intraband crosstalk will result in signal eye diagram close and BER increasing. When the polarization states of signal and crosstalk align, intraband crosstalk seriously decreases signal quality. But when they misalign, it has little influence. Coherent and incoherent crosstalk are studied experimentally. Results show that coherent crosstalk is less harmful to system performance than incoherent crosstalk.