数字无线本地环路

简要介绍了无线本地环路的基本概念，采用的数字技术，ＴＤＭＡ和ＣＤＭＡ无线本地环路系统的结构，并指出无线本地环路在减少成本，灵活入网，扩展网络等许多方面的优势，对几种无线本地环路的容量作了比较，对无线本地环路的前景作了展望。     

无线接入网

本文描述了接入网概念、无线接入技术和无线接入网－无线本地环路及其种类，并详细介绍了先进的ＱＣＴｅｌＴＭ（ＣＤＭＡ）无线本地环路系统。     

关于无线本地环路系统的现状和发展建议

本文主要对无线本地环路的基本概念，市场和产品的现状作了介绍，并提出了无线本地环路系统下一下发展的思路和协议。     

关于无线本地环路未来发展和应用态热的分析

本文详细讨论了无线本地环路的发展态势，指出固定无线接入将是无线本地环路的主要应用方式，而移动接入模式用于企业内部。     

关于无线本地环路未来发展和应用态势的分析

本文详细讨论了无线本地环路的发展态势,指出固定无线接入将是无线本地环路的主要应用方式,而移动接入模式可用于企业内部。     

SRT的无线本地环路系统

本文主要介绍了ＳＲＴｅｌｅｃｏｍＩｎｃ．的无线本地环路系列产品，并对无线本地环路的应用情况进行了分析。     

SRT的无线本地环路系统

本文主要介绍了ＳＲ Ｔｅｌｅｃｏｍ Ｉｎｃ的无线本地环路系列产品，并对无线本地环路的应用情况进行了分析。     

应用扩频技术传送多媒体信息的无线本地环路系统研究

文章介绍无线本地环路的概念，对现存的无线本地环中技术中做了比较，在此基础上提出一种采用扩频技术传输多媒体信息的无线本地环路，并对系统做了原理上的说明。     

利用DECT技术构成的新型无线本地环路

无线本地环路系统是近年来兴起的接入系统之一，它具许多有线系统所没有的优点，本文提出了一种新型的无线本地环路系统，它将一点多址技术和ＤＥＣＴ无绳电话技术有机地结合在一起，以全无线方式数字化地实现了整个用户环路。它针对本地环路的特点，有效地降低系统成本，在我国有很好的应用前景。     

数字无线本地环路和系统

本文对数字无线本地环路进行系统的介绍，着重研究和讲话了ＤＷＬＬ的体系结构及关键技术，为开发和利用数字无线本地环路提供一种借鉴和参考。     

最新网络三层分组交换技术及其应用

分析了局域网中网段划分所带来的网段中子网路由必须依赖传统路由器所造成的网络”瓶颈”问题 ,详细介绍了网络三层分组交换技术的基本原理和拓扑结构 ,给出了其软硬件实现的原理图 ,并指出了它的特点。最后 ,简要讨论了三层分组交换技术在各类网络中的应用及其发展前景     

三网融合产业发展探析

介绍了三网融合的基本概念和发展历程,简析了三网融合的行业实践特点,探讨了其发展的意义和产业前景,最后概述了三网融合试点方案的核心内容,指出三网融合的发展方向。     

后整转时代中小城市数字电视的发展

提出后整转时代中小城市广电网络公司如何继续发展数字电视并保持竞争力问题,同时指出"巩固整转率,提高定购率,提升满意率,增强竞争力"是当前切实可行的举措。     

数字HDTV地面广播传输方法──第六讲 正交频分复用技术的应用

正交频分复用（ＯＦＤＭ：ＯｒｔｈｏｇｏｎａｌＦｒｅｑｕｅｎｃｙＤｉｖｉｓｉｏｎＭｕｌｔｉｐｌｅｘｉｎｇ）因其在抗多径衰落方面的优越性能，并且实现起来比较简单、频谱利用率高，得到了广泛的应用。本文介绍了ＯＦＤＭ的原理及其利用ＦＦＴ技术实现的方法，然后介绍了ＯＦＤＭ在数字化ＨＤＴＶ４面广播中的应用。     

Distributed and cooperative fuzzy controllers for trafficintersections group

This paper presents a fuzzy traffic controller for a set of intersections and its simulation results. The controller of an intersection controls its own traffic and cooperates with its neighbors. It gets information from its traffic detectors and its neighbors. Using this information, the fuzzy rule base system gives optimal signals. It manages phase sequences and phase lengths adaptively to its neighbors' as well as its own traffic conditions. To carry out the performance evaluation of the controller, a simulator for intersection groups has been developed. The proposed method is compared with the vehicle actuated method which is one of the typical conventional methods. The average delay time of a vehicle is used as a performance index. The simulation results show good performance in the case of time-varying traffic patterns and heavy traffic conditions     

电子货币的关键技术及其研究进展

电子货币由于具有匿名等特性,一直是电子支付工具研究的热点之一。本文描述了这一研究热点的基本概念,归纳其主要特性和研究中应用的关键技术,最后介绍它的研究进展。     

利用可编程技术实现交流自动卸载

叙述通信机房的交流供电系统负荷过载引起的问题及其原因，提出利用可编程控制技术实现交流供电自动卸载的方法，并且论述了实现该方法的工作原理和电路设计及其应用意义。     

Community, democracy, and neighborhood news

This ethnographic study examines the interplay between communication, democracy, and community at an inner-city neighborhood newspaper, and explores whether this neighborhood newspaper - through its editor and staff - views itself acting as an agent of strong democracy. The study concludes that, through its focus on neighborhood culture, its acknowledgment of conflict, and its attempts to provide a forum for the neighborhood's self-definition, the newspaper tries to create and maintain participation in its community.     

Design of a 16 way radial microwave power divider/combiner with rectangular waveguide output and coaxial inputs

In this paper, design of a radial power combiner at microwave frequencies has been presented. This structure combines 16 coaxial inputs together and creates one rectangular waveguide output of type WR-187. Although complexity of the proposed combiner compared to combiners with coaxial output has increased, its return loss and VSWR have been improved. In order to achieve a good matching in its high frequency response, a fast tune technique has been applied to design procedure. In its design, a rectangular waveguide has been used together with its radial structure but symmetry among its ports and its phase and amplitude deviations have remained at standard values. Also, in its design, in order to avoid corona breakdown strength of electric field has been controlled and reduced.     

Fault-tolerance: The survival attribute of digital systems

Fault-tolerance is the architectural attribute of a digital system that keeps the logic machine doing its specified tasks when its host, the physical system, suffers various kinds of failures of its components. A more general concept of fault-tolerance also includes human mistakes committed during software and hardware implementation and during man/machine interaction among the causes of faults that are to be tolerated by the logic machine. This paper discusses the concept of faulttolerance, the reasons for its inclusion in digital system architecture, and the methods of its implementation. A chronological view of the evolution of fault-tolerant systems and an outline of some goals for its further development conclude the presentation.