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发改委联合工信部召开大数据发展和应用工作研讨会 近日，发改委高技术司与工信部软件司共同组织召开促进大数据发展和应用工作研讨会，分别邀请国办、教育部、科技部、公安部、安全部、财政部、人社部、环保部、交通部、卫生计生委、人民银行、审计署、工商总局、质检总局、食药总局、统计局、国务院法制办、银监会、证监会等20部门相关负责同志及郭华东、李国杰、吴曼青等院士专家进行了交流。     

通用测试设备步入崭新时代

通用测试产品主要包括有示波器、频谱分析仪、信号发生器、逻辑分析仪、任意波形发生器、万用表、网络分析仪、测试测量仪器,它们被广泛应用于电子设备行业,其用户也涵盖了包括消费电子、汽车、国防、教育、政府、半岛体制造、通信等诸多行业.     

本刊来稿须知

1．本刊设有专题论坛、专业改革、教学改革、科研报告、通讯动态、电子信息、电子科学、电气工程、自动控制、科技应用、课程改革、教学研究、教材建设、实践教学、教学方法、研究生教学、毕业设计、机辅教学、争鸣论坛、高职教育、教学仪器及电坛人物等栏目。     

中国高等学校电子教育学会第24届年会会议纪要

中国高等学校电子教育学会第24届年会于2009年8月5日-10日在海南琼州学院召开。参加会议的有中南民族大学、青海师范大学、牡丹江师范学院、咸阳师范学院、桂林空军学院、韶关学院、重庆教育学院、四川托普信息职业技术学院、四川理工学院、重庆工程职业技术学院、河北北方学院、绥化学院、湖南人文科技学院、梧州1职业技术学院、陇东学院、延安大学、湖南城市学院、宿州学院、山东大学、南阳师范学院、湖南大学、     

南方电讯为中铁十三局视频会议系统保驾护航

背景概述 中铁十三局集团为中央企业先后参加了多条高速公路、大桥、隧道以及水利水电、工民建、矿山、钢结构、市政等多项工程的施工。集团先后建立了长春、大连、深圳、盘锦、哈尔滨、天津6个分公司和北京、上海、广州、深圳、南京、西安、昆明、兰州等经营办事机构，     

十年一剑，风生水起——2008中国国际工业博览会专题报道

11月4日，中国国际工业博览会（以下简称工博会）迎来了它的十周岁生日。作为工博会的重要组成部分之一——工业自动化展（IAS2008）同期在上海新国际博览中心E1、E2、E3馆拉开全新帷幕。西门子、施耐德、ABB、GEFANUC、富士电机、上银、三垦力达、伦茨、威琅、威图、光洋、中达电通、英威腾、普传、海利普、汇川、罗升、万可、宜科、鹰峰、固安捷、卡固等近500家中外知名企业参加了此次展会，     

本刊来稿须知

1.本刊设有专题论坛、专业改革、教学改革、课程改革、自动控制、教学研究、电子信息、电气工程、教材建设、实践教学、教学方法、机辅教学、争鸣论坛、高职教育、教学仪器及电坛人物等栏目。     

本刊来稿须知

1.本刊设有专题论坛、专业改革、教学改革、课程改革、自动控制、教学研究、电子信息、电气工程、教材建设、实践教学、教学方法、机辅教学、争鸣论坛、高职教育、教学仪器及电坛人物等栏目。2.来稿文题应简明、具体和确切。文章中的英、希文字母的正斜体、黑白体、大小写、上下标等务必正确打印。     

本刊来稿须知

1.本刊设有专题论坛、专业改革、教学改革、课程改革、自动控制、教学研究、电子信息、电气工程、教材建设、实践教学、教学方法、机辅教学、争鸣论坛、高职教育、教学仪器及电坛人物等栏目。2.来稿文题应简明、具体和确切。文章中的英、希文字母的正斜体、黑白体、大小写、上下标等务必正确打印。     

我们为什么要成立全国总编辑俱乐部

10月24日,"全国总编辑俱乐部"在北京希尔顿逸林酒店宣布成立,来自新华社、中新社、中国青年报、南方周末、第一财经日报、精品购物指南、经济观察报、楚天都市报、重庆商报、华西都市报、南方都市报、时代周报、新浪网、搜狐网、IT商业新闻网、人民网等媒体的总编辑和相关负责人出席了成立酒会.     

IMS实验网的研究与实现

随着各运营单位的重组和3G牌照的发放,各通信网络的融合与完善对IMS网络发展提出了更高的要求。模拟IMS网络,测试IMS网络,完善IMS网络,使得IMS实验网的搭建变得至关重要。本文介绍了IMS网络的基本结构和功能,采用相关研究工具,组建IMS实验网,部署实现包括P-CSCF、I-CSCF、S-CSCF、HSS和AS等功能实体,实现IMS网络的基本的通信,设置AS提供增值服务。经过测试,验证了系统设计的有效性,为用户带来全新体验。     

澳洲插头产品的法规要求及标准解析

介绍了澳大利亚插头产品的法规要求及插头的型式、尺寸、参数和测试要点,分析了插头的电流额定值和配线之间的关系,强调了插销绝缘套的要求。对重要的试验项目,如弯曲试验、插销绝缘套的耐磨试验、温升试验、高温压力试验进行了说明。     

Alternative Schemes for Dynamic Secure VPN Deployment in UMTS

Three alternative schemes for secure Virtual Private Network (VPN) deployment over the Universal Mobile Telecommunication System (UMTS) are proposed and analyzed. The proposed schemes enable a mobile node to voluntarily establish an IPsec-based secure channel to a private network. The alternative schemes differ in the location where the IPsec functionality is placed within the UMTS network architecture (mobile node, access network, and UMTS network border), depending on the employed security model, and whether data in transit are ever in clear-text, or available to be tapped by outsiders. The provided levels of privacy in the deployed VPN schemes, as well as the employed authentication models are examined. An analysis in terms of cost, complexity, and performance overhead that each method imposes to the underlying network architecture, as well as to the mobile devices is presented. The level of system reliability and scalability in granting security services is presented. The VPN management, usability, and trusted relations, as well as their behavior when a mobile user moves are analyzed. The use of special applications that require access to encapsulated data traffic is explored. Finally, an overall comparison of the proposed schemes from the security and operation point of view summarizes their relative performance. Christos Xenakis received his B.Sc. degree in computer science in 1993 and his M.Sc. degree in telecommunication and computer networks in 1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998–2000 was with the Greek telecoms system development firm Teletel S.A., where was involved in the design and development of advanced telecommunications subsystems for ISDN, ATM, GSM, and GPRS. Since 1996 he has been a member of the Communication Networks Laboratory of the University of Athens. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST). His research interests are in the field of mobile/wireless networks, security and distributed network management. He is the author of over 15 papers in the above areas. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of Electrical Engineering and Computer Science at the University of Connecticut, Storrs. From 1986 to 1994 he was on the faculty of the Electrical and Computer Engineering Department at Northeastern University, Boston, MA. During the period 1993–1994 he served as Director of the Communications and Digital Processing Research Center at Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. His research interests are in the design and performance analysis of broadband networks, and wireless/mobile communication systems and services. He has authored more than 150 papers in the above areas. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies & Services (ACTS) and Information Society Technologies (IST) programmes funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE). He is chairman of the board of the Greek Universities Network, the Greek Schools Network, and member of the board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

企业VPN技术应用实施浅析

随着企业规模逐渐扩大,远程用户、分支机构、合作伙伴也在不断增多,关键业务的需求增加,出现了一种通过公共网络（如Internet）来建立自己的专用网络的技术,这种技术就是虚拟专用网（简称VPN）。本文首先介绍了VPN的概念,对VPN的实现技术进行了分类和适用性分析,然后分析了各种类型的企业在信息安全方面的需求和限制,根据不同企业的特点提出了不同的VPN解决方案,最后,对VPN在集成电路企业中的应用做了简单的拓朴展示。     

RFID相关技术专利分析(三)

RFID技术作为一项重要的非接触式识别枝术,近来发展迅猛。本文对RFID天线相关的技术进行了专利战略分析,主要包括:RFID天线相关整体行业分析、RFID标签天线和制造工艺等三个方面,分析了如下主要指标:申请年度发展趋势、主要申请人地区分布、IPC分布、DWPI分布、主要申请人分布、核心专利排名、专利地图。根据分析结果,本文给出了分析结论,对相关企业在专利利用、保护和管理方面给出了建议与对策。     

RFID相关技术专利分析(二)

RFID技术作为一项重要的非接触式识别技术,近来发展迅猛。本文对RFID天线相关的技术进行了专利战略分析,主要包括:RFID天线相关整体行业分析、RFID标签天线和制造工艺等三个方面,分析了如下主要指标:申请年度发展趋势、主要申请人地区分布、IPC分布、DWPI分布、主要申请人分布、核心专利排名、专利地图。根据分析结果,本文给出了分析结论,对相关企业在专利利用、保护和管理方面给出了建议与对策。     

LFM雷达对高超声速目标的数据关联研究

基于统计判决的关联决策是当前多雷达数据关联的一个有效途径.然而,在采用该方法对高超声速目标数据关联的问题进行研究时,却会出现随着雷达测量精度的提高,不同雷达数据关联的正确关联概率反而下降这一现象.针对这一情况,首先,利用线性调频（linear frequency modulated,LFM）雷达合理构建了基于统计判决的高超声速目标数据关联模型;接着,在现有的统计判决机制下,进一步分析了目标高超声速运动对多LFM雷达数据关联的影响,并得出了其关联判决函数（服从非中心卡方分布）与现有的关联判决门限（服从卡方分布）相矛盾的结论;最后,结合统计学的原理,通过对目标非中心统计参量的有效求解,合理解释了上述奇怪现象的出现.仿真结果表明,在目标高超声速运动的条件下,上述奇怪现象的出现是合理的.     

接入控制器安全网络管理系统的设计与实现

在讨论了接入控制器(AC)网络管理系统安全重要性的基础上,分析了SNMP协议的应用,包括对其3个版本SNMPv1、SNMPv2及SNMPv3的优缺点的对比,并解释了该设备网络管理系统采用SNMPv3版本的原因.详细介绍了AC所实现的管理信息库的内容,包括RFC1213协议、IEEE 802.1x协议、RMON协议、Web DHCP、EAP_OTP、EAP_MD5、EAP_TLS、EAP_SIM等多种认证协议以及网络管理系统的五大功能.最后阐述了AC安全网络管理系统结构的设计与实现.     

雷达探鸟技术发展与应用综述

探鸟雷达已成为机场鸟击防范、风力发电场鸟击风险评估、鸟类自然保护区鸟情观测与科学研究的重要工具。文中首先论述了探鸟雷达的主要组成部分。然后,分析了地面杂波、空域杂波和其他无关目标对探鸟雷达探测效果的影响,进而介绍了传统的杂波抑制方法和相参雷达杂波抑制技术,以及先进的探鸟雷达采用的目标检测、目标跟踪、目标显示、数据记录和雷达组网等数据处理技术。接着,给出了当前的探鸟雷达能够获取的目标轨迹、回波大小、回波强度、信号波动、飞行速度、飞行高度等反映飞鸟目标特性的主要指标。最后,描述了国内外四种典型雷达探鸟系统,并针对雷达探鸟技术的未来发展提出了一些思考及可行性建议。     

SOI Technologies Overview for Low-Power Low-Voltage Radio-Frequency Applications

Thanks to their structure, the SOI technologies present several intrinsic advantages for analog and RF applications. Indeed, as it is well established now, these technologies allow the reduction of the power consumption at a given operating frequency. Moreover, the high-insulating properties of SOI substrates, in particular when high resistivity substrate is used, make that these technologies are perfect candidates for mixed-signal applications. In the present paper, we will discuss the performances of the SOI technologies in radio-frequency range. First of all, the high-frequency behavior of SOI substrates, thanks to the characterization of transmission lines, will be shown. The impact of the SOI substrate resistivity on the performances of passive components will also be analyzed. Then, an overview of RF performances of SOI MOSFETs for two different architectures, fully- and partially-depleted, will be achieved and compared to the bulk ones. Finally, the influence of some specific parasitic effects, such as the kink effect, the self-heating effect and the kink-related excess noise, on the RF performances of SOI devices will be studied, thanks to a specific high-frequency characterization.