载波通信模块在远程抄表系统中的应用

介绍一种用KQ-100E模块实现的智能抄表系统该模块可以直接利用电力网通信，采用FSK载波通信方式，通信的成功率高。微机通过RS232串行通信口与KQ-100E模块连接进行通信，不仅可以完成抄表系统数据的采集，还可以对采集得到的数据进行存储和运算，并对用户的三表进行控制，为用户提供方便、高效的服务。     

基于电力线载波的抄表系统设计

电力线载波是一种利用现有的电力线路进行信号传输的通信技术.该文提出了一种基于电力线载波的抄表系统方案,主要包括载波电表、数据集中器、计算机管理中心三部分,文章重点介绍了载波模块的设计,其载波芯片采用KQ-330.该抄表系统采用FSK调制解调技术,具有很高的接收灵敏度和很强的抗干扰能力,实现了远程集中抄表的目的.     

基于KQ—100K的电力线载波通信系统的优化设计

给出了以KQ-100K载波芯片为核心制作低压电力线载波通信系统,以提高系统抗衰减和抗干扰性能的设计方法．同时介绍了载波芯片KQ-100K的工作原理以及载波发送和接收单元的接口电路．最后给出了对基于KQ-100K的载波通信系统进行优化设计的具体方法。     

基于电力线载波的智能小区自动抄表系统设计

对传统抄表系统进行了研究，对高性能自动抄表系统所需技术进行了分析，提出了一套基于电力线载波技术的新型智能小区抄表系统的设计方案，并通过分析和实际应用证明了抄表系统的高性能和高可靠。     

无线与电力载波双信道用电信息采集设备的研究

电能计量集抄系统是一种将电能计量数据自动采集、传输和处理的系统,它克服了传统的人工抄表模式效率低,容易出错的缺点,不仅提高了工作效率,更推进了智能电表的信息化的发展。当前用电采集系统集中器和智能电表之间主要是采用窄带电力线载波和微功率无线两种通信方式,用电采集系统对信道通讯可靠性要求越来越高,因此我们研发了基于窄带电力线载波和微功率无线的双信道通信方案--无线载波通信模块。无线载波通信模块具有窄带电力线载波和微功率无线两个信道的通信能力,兼具了窄带电力线载波和微功率无线两种通信方式各自的优点,信道之间互相独立并行工作,同时又相互协作,互相补充,发挥出各自信道的优势,有效地保证了系统通讯的畅通,实现高实抄率和高准确率。     

基于电力线载波的远程自动智能抄表系统

通过对现有各种抄表方式的对比,设计出的成本低、高效率的自动远程智能抄表系统。介绍了系统的内部结构,各组成部分的原理及工作过程。系统利用目前的低压电力线载波技术,利用现有的电力线网络,不需重新布线,接入成本低。实验证明,该系统能实现远程自动抄表功能,而且扩展性强、维护方便、经济实用,节省了大量抄表人力,而且抄表准确性强,具有很大的发展空间。     

低压电力线载波通讯技术在中国智能电网中的应用现状及发展方向

随着低压电力线载波通讯技术在中国智能电网建设中的逐步应用,载波抄表已成为低压集抄系统采用的主要方案。本文在介绍各主要载波厂商技术方案的基础上审视了各厂家低压电力载波技术的发展历程,并根据目前掌握的最新情况,探讨低压电力线载波通讯技术的未来发展方向。     

基于低电压载波通信的智能小区设计

智能小区的普及化发展要求智能小区面向低成本、高性能的目标设计。无论从技术方面或者经济方面考虑,采用电力线载波通信是实现小区智能化的最佳方式。文中结合电力线载波扩频通信技术的优点设计了一个新的智能家庭系统。在电力线为通信介质的前提下,探讨了家庭智能网络的一部分应用——小区自动抄表系统。本设计主要的研究对象的侧重点是整个通信系统中的最基本单元。基于扩频载波芯片IntellonSSCP300的小区自动抄表系统是一个相对经济的解决方案。     

基于GSM的无线抄表系统终端机的设计

本文介绍了GSM模块SIM100-E的硬件接口特性、功能,以及该模块在无线抄表系统终端机中的作用以及使用方法。并详细介绍了短消息模式下的PDU格式、数据编码方式和AT命令,给出了该模块在系统中的硬件连接图和部分关键代码。该模块可发送和接收抄表系统中所有的抄表信息,增加系统的灵活性,降低系统成本及功耗。     

基于DPSK直序扩频的电力线载波远程抄表系统

介绍了扩频通信原理及远程抄表系统的结构．针对低压电力线背景噪声大、信号衰减大的缺点．提出了将DPSK直序扩频应用于电力载波远程抄表系统的思想并完成了总体方案的设计，之后介绍了调制解调芯片PL2101的结构及其在本系统中的工作原理。最后简要介绍了系统抄表计费模块的软件设计方案。本系统有着很高的实用价值和广阔的应用前景。     

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.     

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.     

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.     

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