新一代移动通信测试技术探讨

新一代移动通信系统包括目前的3G移动通信系统、下一代B3G/4G移动通信系统,以及无线宽带通信系统。论述了新一代移动通信测试技术在系统和终端设备研制生产中的需求,给出了3G通信系统测试、3GPP数据增强系统测试、CDMA2000-1X高速数据传输测试、3GPP LTE通信系统测试、WiMAX通信系统测试、B3G/4G通信系统测试和UWB无线通信测试技术的方向与重点。     

用于智能电网的新一代宽带无线移动通信技术

随着ICT技术的迅猛发展和电力通信网络的发展,新一代宽带无线移动通信技术应用于电力通信网络已成为人们关注的热点,智能电网的配电、用电需求对宽带无线移动通信业提出了更高的要求。文章简要介绍了移动通信系统的发展演进和新一代宽带无线移动通信系统．并对其在我国电力通信网络中的应用作了展望。     

山西电网部署下一代网络的探讨

基于数据网的下一代网络是可以提供包括语音、数据和多媒体等各种业务的开放的网络构架,是信息通信网络发展的必然趋势.文章结合山西电力通信网络及办公自动化系统的情况,分析了山西电网建设下一代网络的必要性和可行性,提出了基于软交换的有关组网方案和网络配置,介绍了软交换解决方案的特点,最后从先进性、运行管理及网络安全可靠方面说明了软交换技术的优越性.     

Hibernia: the next generation of offshore platform control systems

CIE-computer-integrated enterprise-technically best describes the Hibernia's new Grand Banks, Newfoundland, offshore drilling and production platform. Designed and constructed in an era of oil company belt-tightening, Hibernia takes advantage of modern technology to achieve the goal of a safe, cost-effective control system design. Some of the design criteria used in the control system design are discussed: system operability, training, safety, maintainability, constructability, expandability and integration, engineering/management information, and cost effectiveness. The main features of the control system are then described including: the process control system, fire and gas detection system, emergency control system, ECS/PCS process shutdown, electrical power management system, HVAC control system, drilling data acquisition system, and the engineering/management information system     

软交换平台在下一代电力通信网络中的应用

软交换平台是下一代网络的核心功能实体之一,为下一代网络提供具有实时性要求的业务呼叫控制和连接控制功能。文章介绍了下一代网络的基本概念,重点论述了软交换平台的体系结构、以软交换技术为基础的下一代交换网络的电力发展策略,以及在下一代电力通信网络中的重要应用,强调了下一代网络将成为未来几年电力通信发展和建设的重要方向。     

Development of a thyristor valve for next generation 500 kV HVDCtransmission systems

A high voltage thyristor valve is the basic component of an HVDC transmission system. Development of a 500 kV valve for next generation HVDC transmission systems is described. First, the power loss of the valve is analyzed to decide a reasonable wafer size for the light-triggered thyristor. From these results, a six inch diameter wafer size is selected. A light-triggered thyristor, with ratings of 8 kV and 3.5 kA, is developed using the six inch wafer. The design of the valve employing the thyristor and test results with a prototype valve prove that a 500 kV valve can be realized by this design method     

第3代移动通信主流接入选择CDMA方式的理由

结合3G当前的研究成果和未来发展的需要，主要从功率利用率和频谱利用率两方面分析比较了CDMA和GSM两类不同移动通信体制的差异，印证了CDMA更胜一筹的原因。文章从对移动信道多径传播能量的利用、发信持续时间内的发信功率和功率谱密度3方面阐述了CDMA为何能保持功率利用率居高不下，而瞬时发射功率小(可减少电磁干扰对人体的危害)的缘由；从CDMA使用扩频通信方式和使相邻小区可复用相同频点等方面的技术，分析了导致CDMA频谱利用率高的直接原因。     

search: the next generation

The more we come to rely on search engines, the more we find their shortcomings. With public searchers like Google lurching toward more commercial business models, should organizations consider building their own search engines? By Chris Edwards. "Everyone thinks search is typing keywords into a box," says Mike Lynch, the head of search specialist Autonomy. "But that is going to change." The science of Web searching has reached a crucial stage in its development: for proof just Google 'Web search future'. Lynch reckons that, as the mechanics of search head into the deepest recesses of the IT system, it will steadily reduce our dependence on Google as a primary Web inquisitor, and make that box fade from our memories.     

Optical burst switching for the next generation Internet

Demands for network bandwidth increase daily. In order to meet our ever-increasing network bandwidth needs, one solution is to design and build the next generation Internet with an optical core infrastructure, with last connection provisioning time and unprecedented high data rates of 100 terabits per second and higher. An optical network is built by interconnecting various optical switches with wavelength-division multiplexing (WDM) fibers, i.e., fibers that can simultaneously transmit data over different wavelengths. Many of today's commercial optical networks, however, do not utilize the WDM technology efficiently. With respect to the current state of the technology, an Optical Burst Switched (OBS) Network is one of the most promising all-optical architectures for the next generation Internet. It efficiently supports the transmission of bursty traffic over an all-optical infrastructure. OBS is still being developed and it has not been standardized yet. This article describes the main features of an OBS network, its benefits as well as its challenges.     

基于公用移动网的配网通信系统

分析了目前配网通信面临的难题,提出了基于公用移动网的无线配网通信系统的解决方案,并且分析了这个解决方案的优点和存在的问题.在此基础上,文章给出了一个完整的、高可靠性的基于双移动网络的无线配网通信系统,并具体地说明了这个系统的功能、通信能力、通信方式等技术指标,对组成系统的中心站、终端站和网管设备做了详细的说明.     

上海电力应急抢修移动指挥系统通信平台建设的关键要素分析

上海电力应急抢修移动指挥系统是集无线通信技术、数据传输技术、信息技术于一体的多功能综合化指挥平台,项目的成功建设,充分体现了以信息化为主体的现代技术应用是上海城市电网发展的重要组成部分.主要阐述了上海电力应急抢修移动指挥系统通信平台建设整个过程中各个环节所需考虑的关键要素及分析,以及与建设要求相匹配的措施和成功经验,其中分析了在各关键环节的注意事项,以及对应于建设原则、建设需求所采取的手段和方法.     

Vipersat卫星通信系统在电力应急抢修移动指挥系统中的应用

VSAT通信系统以其设备简单、建设速度快、建站及通信费用低、组网灵活、多址接入、数据传输速率高、系统稳定可靠、综合通信能力强等特点获得迅速发展.移动指挥系统是功能综合的信息化平台,具有数据传输量大、实时性要求高、事件响应快速等特点,为此通信系统构建是关键.阐述了利用现有的卫星通信技术和Vipersat卫星通信系统来实现上海电力应急抢修移动指挥系统的解决方案,分析了使用Vipersat卫星通信系统的优势和它的功能及性能,以及该系统的组成和应急通信应用情况.     

A vision of an electric power architecture for the next generation

Since the present hierarchical power grid structure and AC interface are mature and rigid, a new electric power system architecture is proposed here to save the earth by making use of renewable energy sources. The architecture consists of a new concept and a historical technology, that is, a network of many “electric clusters” with a DC interface. The cluster includes dispersed electric power generators, electric appliances, electric storage, and “electric power routers.” The router is equipment to resourcefully route electrical energy between neighboring clusters and to manage electrical energy in the cluster. The transfers of electrical energy (between clusters and within clusters) and the generation of electricity from renewal energy sources (such as sunlight, wind, tides, and biogas) are intermittent and have very wide dynamic ranges, so that the interface must make use of DC. When we achieve an energy society with this architecture, we will be able to reduce energy consumption, greenhouse gas emissions, and materials use. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(1): 18–25, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20039     

The next landmark in vision - [automation vision systems]

The emergence of highspeed 3D image processing technologies is a major milestone for the vision industry as it represents the most significant step change in processing capabilities since the development of the 2D pattern recognition algorithms.     

新一代网络互联协议安全性分析

当前网络应用层存在许多安全问题并缺少有效的安全认证机制,文中介绍了IPng的特色、以IPSec为基础的安全概念与功能,以及在IPv6新体系下在其应用领域中采用的安全策略。     

WCDMA移动通信系统中速率匹配的研究与设计

速率匹配单元是WCDMA系统相对于其他2G到3G的移动通信系统比较独特的基带信号处理单元。论文从算法、思想、执行流程上分析了速率匹配的目的、原理与意义，并简略介绍了一种硬件设计实现的方案。     

移动氢源用铝水反应制氢技术研究

铝水反应可作为一种快捷有效的制氢技术为燃料电池提供氢源。考察了几种改善铝水反应制氢的途径,比较了铝水反应制氢成本,设计了氢气生产利用与残渣回收工艺。结果表明:提高碱液浓度、提高温度、增加铝粉的比表面积等都能有效地提高产氢速率;NaOH和KOH对铝水反应有明显的促进作用,二者的最大产氢速率基本相同;Ca(OH)2的促进作用明显弱于前两者;在相同的实验条件下,Mg(OH)2和Al(OH)3对铝水反应几乎无促进作用;沉淀的存在有助于铝水反应。     

新一代通信卫星电源控制器

对新一代大容量通信卫星电源系统的组成结构和工作原理进行了介绍,论述了母线动态控制方式,介绍了模块组成、功能模块设计,并给出了21.6 kW样机测试情况,对新一代大容量通信卫星的电源系统设计具有较强的指导意义。