行业资讯

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.     

空间互联网技术发展现状及趋势

空间互联网技术是人类进行航天测控、导航定位、远洋航行等空间应用的基础支撑,是实现全球互联互通的关键手段。首先介绍了空间互联网的概念及内涵、组成及结构、特点及优势等相关基础知识,接着总结了空间互联网的关键技术,然后阐述了空间互联网的发展现状和面临的问题,最后结合互联网技术发展趋势和航天应用的发展要求,对空间互联网技术的发展趋势进行了展望和预测。     

高速光纤综合通信网络平台研究

现代通信网络应能满足各种通信业务和通信容量日益发展的需求,实现话音、数据、视频、IP等业务的一体化综合交换和传输。在比较TDM、IP和ATM三种协议的基础上,提出"采用内置RPR和MPLS功能的MSTP平台"建设光纤综合通信网络平台的实现方法。MSTP采用SDH的数据帧结构,保持了SDH标准光接口、灵活分插低速信号、自愈环保护和功能强大的网管等优点,可对TDM、IP和ATM协议进行优化传输。     

带SIR结构新型多枝节加载双频滤波器

本文在传统λ/4阶梯阻抗谐振器的基础上,提出了一种新型的宽带双频滤波器改进设计方案。改进的滤波器增加了传输零点,此传输零点能有效的改进通带的选择性和阻带特性,且上阻带带宽很宽。结构简单,在传统类似滤波器同谐振频率基础上有效缩小了尺寸,并且设计的滤波器通带的中心频率和带宽是完全独立可控,方便我们应用到实际。工作在4.1 GHz和6 GHz两个频段,3 dB相对带宽分别为7.2%和2.2%,实测和仿真吻合良好。     

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.     

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.     

TD-LTE符号间干扰和载波间干扰分析

ISI和ICI是TD-LTE系统机制固有的干扰现象,也是TD-LTE系统必须消除和抑制的问题。通过对ISI和ICI产生机制及消除方法的定性分析与理论推导,可使广大工程技术人员对TD-LTE系统有全新的认识,为其管理、维护和优化TD-LTE系统提供帮助。     

Cospas–Sarsat LEO and GEO: Satellite distress and safety systems (SDSS)

Cospas–Sarsat Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO) networks must provide enhanced service of Satellite Distress and Safety Systems (SDSS); to improve Search and Rescue (SAR) operations in all environments; and to increase safety and security at low cost for numbers of mobiles at sea, on land and in the air. This paper describes the concepts of integrated LEO and GEO space configurations in function of Cospas (space system for search of distress vessels and airplanes) and Sarsat SDSS, and SAR infrastructures. The paper also reviews satellite repeaters providing SDSS service for satellite beacons known as an Emergency Position Indicating Radio Beacons for Maritime, Personal Locator Beacons for land (road and rail), and Emergency Locator Transmitter (ELT) for aeronautical applications. Copyright © 2007 John Wiley & Sons, Ltd.     

Rural broadband: Gaps,maps and challenges

This paper examines challenges to evidence-based decision-making in the design and implementation of rural broadband investment programs. Our focus is on Canada, and the apparent need for further intra-rural broadband research and better data and mapping for informing public investment decisions, but similar challenges are evident in the international literature. Based on proprietary telecommunication provider datasets, the Canadian Radio-television and Telecommunication Commission (CRTC) estimates that broadband services with advertised speeds that meet its basic universal service targets (50 Mbps download and 10 Mbps upload) are available to 87.4 percent of households in Canada. In rural areas however, services that meet CRTC’s speed targets are available to 45.6 percent of households. Moreover, effective speeds and service quality levels that suppliers deliver and users experience tend to fall well below the government’s aspirational targets. In response to demand for better broadband, a variety of initiatives are directing public investment to the deployment of regional and rural broadband networks, which are typically owned and operated by private companies. There remains a serious lack of relevant data and its effective use in creating rural broadband strategies and managing public investment projects. Evidence from the literature suggest that this affects the degree and quality of geo-spatial and econometric analysis that results in a limited empirical basis to allocate scarce public investments, aggregate demand of consumers/communities, and assess the outcomes of rural broadband initiatives ex post. This paper provides a historical overview of rural broadband development in Canada and questions if the body of knowledge to inform public investment initiatives has grown sufficiently to ensure their effectiveness and sustainability. With a regional case from southwestern Ontario, Canada, we discuss the findings of the literature review, characterize the broadband data challenge, and discuss the importance of proprietary provider data cross-referenced with Internet user experience data.     

1xEV-DO与HSPA无线接入技术对比

HSPA与1xEV-DO具有相同的目的和基本相同的技术实现手段,本文主要对1xEV-DO与HSDPA从标准演进、关键技术、网络结构与性能、商用情况等方面进行了全面的对比分析。     

Graphene‐Based Nanomaterials: Synthesis,Properties, and Optical and Optoelectronic Applications

Graphene, a two‐dimensional, single‐atom‐thick carbon crystal arranged in a honeycomb lattice, shows extraordinary electronic, mechanical, thermal, optical, and optoelectronic properties, and has great potential in next‐generation electronics, optics, and optoelectronics. Graphene and graphene‐based nanomaterials have witnessed a very fast development of both fundamental and practical aspects in optics and optoelectronics since 2008. In this Feature Article, the synthesis techniques and main electronic and optical properties of graphene‐based nanomaterials are introduced with a comprehensive view. Recent progress of graphene‐based nanomaterials in optical and optoelectronic applications is then reviewed, including transparent conductive electrodes, photodetectors and phototransistors, photovoltaics and light emitting devices, saturable absorbers for ultrafast lasers, and biological and photocatalytic applications. In the final section, perspectives are given and future challenges in optical and optoelectronic applications of graphene‐based nanomaterials are addressed.