SSL协议分析及其在Web服务应用中的改进

本文介绍了SSL提出的背景、作用和原理。描述了SSL协议栈及其组成部分的作用。分析了SSL的安全机制，阐明了SSL2．0存在的安全缺陷及在SSL3．0中的改进措施。分析了SSL在Web服务应用中的通信原理，结合实例说明了SSL通信的实现。针对SSL在Web服务应用中的缺陷，提出了相应的改进措施。     

光纤传输系统中四波混频效应的数值研究

搭建光纤系统中四波混频效应的仿真平台,数值计算色散系数、极化角、泵浦功率、光纤衰减系数、光纤纤芯有效面积等因素对FWM的影响。数值结果表明:较小的色散系数、合适的极化角、高的泵浦功率、小的损耗系数、纤芯面积与泵浦光波长间隔都能有效地促进四波混频效应的产生。     

A survey of issues in computer network security

Computer networks are proliferating rapidly for a number of reasons discussed in this paper. During this boom, relatively little attention has been paid to computer network security. This paper describes problems posed by network security and presents a survey of methods and technologies available today to enhance network security. Current methods are discussed, including information security strategy, computer security and its relation to network security, data communications security, and data encryption. Ideas from promising areas of research close the paper.     

The development of telecommunications: The outcome of an ecology of games

Since the AT&T divestiture, the telecommunications industry has been undergoing dramatic change. A great deal has been written about the nature of the forces driving this change and about various trends in telecommunication infrastructures and services. However, this literature seldom describes how new communication infrastructures and services are planned and developed within the post-divestiture context. This paper focuses on this decision-making process and offers a theoretical perspective, called an “ecology of games,” which is suggested by a case study of one company's entry into the microwave communications business.     

与高压输电系统临近的通信局（站）地电位的分布

论述了中性点直接接地高压输电系统发生接地故障时,其附近的通信局（站）地网上的地电位分布,根据不同的接地故障位置选择相应的模型推导出相应的地电位升公式,同时给出了案例分析。     

基于LTCC技术的C频段星载接收机混频器

利用低温共烧陶瓷(LowTemperature Co-fired Ceramic,简称LTCC)技术,设计制作了一种可应用于C频段星载接收机的双平衡混频器。该混频器将射频和本振巴伦等无源器件集成在多层LTCC基板内,实现了电路的小型化、高集成度和高可靠性。测试表明,当射频输入为5.925～6.425GHz、本振频率为2.225GHz、中频输出频率为3.7～4.2GHz时,混频器的变频损耗≤9.3dB,P1dB为5.7dBm,本振到射频和本振到中频的隔离度分别为39.44dB和35.58dB。混频器的尺寸为40×22×1.92mm3。     

云计算在手机通信中的应用研究

云计算作为一种新兴的信息技术模型,已经在IT界引来了越来越多的关注.伴随手机的普及,手机用户对手机功能需求的增加,现有的手机功能已无法满足用户的要求.将云计算思想应用于在手机通信中,就可以很好地满足用户日益增长的需求,云计算在手机通信中有着良好的优势,将云计算应用在手机通信中会是一个理想的选择.     

采用模拟网络编码的认知中继网络双向通信的最优功率分配

Cognitive radio and cooperative communication can greatly improve the spectrum efficiency in wireless communications. We study a cognitive radio network where two secondary source terminals exchange their information with the assistance of a relay node under interference power constraints. In order to enhance the transmit rate and maintain fairness between two source terminals, a practical 2-phase analog network coding protocol is adopted and its optimal power allocation algorithm is proposed. Numerical results verify the superiority of the proposed algorithm over the conventional direct transmission protocol and 4-phase amplify-and-forward relay protocol.     

MODBUS无线通讯技术在叶轮给煤机上的应用

论述了叶轮给煤机远程监控的常见问题,采用当前最新的2.4G通讯技术,借助PLC强大的数据通讯处理功能,通过MODBUS通讯协议,实现了叶轮给煤机的远程监控,阐述了整个系统的设计思路、基本原理及程序设计要点。     

Power Line Communications: State of the art in research,development and application

Power Line Communications (PLC) is currently well-known technology. In the last 10–15 years its development and improvements became considerable so that the mass deployment takes place. In this paper we describe the main trends of PLC development.