SNC保护在故障测试定位中的应用

通过实例详细介绍了如何利用SNC保护测试来定位故障。文章首先介绍了具体实例的故障现象,接着介绍了测试方案和实施方法,然后着重介绍了测试过程。     

工资邮件程序-为ERP提供完美支撑

本文主要对工资邮件程序的开发进行了分析介绍。首先介绍了本项目开发的背景,其次介绍了本项目的开发环境,最后详细介绍了ESMTP协议和EXCEL类库。     

基于M600的便携终端显示界面设计

文章首先介绍了便携终端的组成和功能,然后介绍了北京迪文科技有限公司的M600人机界面驱动模组,接着介绍了便携终端显示模块的硬件构成,最后介绍了便携终端的显示界面设计。     

美国三大核武器实验室IT进展

简要介绍了美国三大核武器实验室近期IT基础设施的建设情况。首先对ESNet的主干网和涉密网SecureNet的建设和升级进行了介绍,并以LANL为例介绍了内部局域网的安全域划分;其次是对IT基础服务的介绍,并以SNL为例,介绍了其近年来的主要工作进展。     

MMT技术概述和基于MMT的混合媒体传输

本文介绍了MPEG近期推出了一项新的标准,MPEG Media Transport (MMT),介绍了它所包含的关键要素,同时介绍了MMT功能区、接口以及端到端构架.并对混合媒体在异构网络中的传输做了案例分析,对于时钟同步方式做了介绍.     

数字集群越区切换的研究(上)

本文介绍了数字集群中越区切换的相关知识和实现方法.首先,介绍了越区切换的产生原因.然后,介绍了越区切换的典型实现方法.接着,以TETRA系统为例着重介绍了数字集群中越区切换的实现过程.包括切换前的测量、切换的策略和如何切换处理.最后介绍了越区切换的考核方法.     

TD-SCDMA/GSM/GRPS双模终端发展分析

首先介绍了双模终端的分类,然后介绍了双模终端的发展策略,最后重点介绍了双模终端在3G网络建设中的作用.     

ZigBee技术简介

首先介绍了ZigBee技术的由来．接着介绍了ZigBee协议栈的组成、网络拓扑、特点以及ZigBee技术的优点．最后介绍了ZigBee技术的应用。     

基于现网的HSPA＋网络部署探讨

介绍了HSPA＋的演进,并结合珠海外场测试介绍了系统如何升级HSPA＋网络,同时简要介绍了测试结果,最终提出64QAM部署建议     

Java虚拟机在机顶盒中的研究和移植

本文介绍了基于数字电视机顶盒的Java虚拟机的移植方法。首先简要介绍了Java语言,其次介绍了适用于数字电视机顶盒的Java虚拟机——CVM,并给出了CVM移植到数字电视机顶盒的方案和实现过程,其中重点介绍了多线程的实现方法,包括多线程的同步和协作等。最后介绍了测试平台的搭建。在这些工作的基础上,成功地完成了Java虚拟机的移植。     

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.     

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.     

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.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.