CECNET—I型中华学习机辅助教学网络系统

本文介绍了以中华学习机为主机,并以 IBM PC/XT 为服务器的一种新型辅助教学网络系统。详述了其通道访问原理、体系结构、网络协议及实现技术。     

网络电话技术及应用

网络电话技术完全不同于传统的通信技术,是新的、纯粹的网络技术的应用,与IP电话也有本质的区别.概述当前的网络电话技术及相关的技术协议、标准,介绍3种网络电话应用软件特点及使用方法,并对网络电话的未来发展进行展望.     

IP ADDRESS AUTOCONFIGURATION FOR WIRELESS AD HOC NETWORKS

IntroductionWireless ad hoc networks are gaining increas-ing popularity in recent years because of their easeof deployment. No wired base station or infras-tructure is supported,and each hostcommunicatesone anothervia packetradios. In ad hoc networks,routing protocols are challenged with establishingand maintaining multihop routes in the face of mo-bility,bandwidth limitation and power con-straints. In ad hoc networks,each node( host)acts as a router since routes are mostly multihop.Nodes in …     

基于开放协议的城市轨道交通视频监控系统

引用"分而治之,扁平化管理,分权管理"的思想,设计了视频监控新系统的框架;并采用先进的H.264视频压缩算法,融合了GB/T 28181的要求和ONVIF(开放型网络视频接口论坛)等标准协议,设计了一个满足城市轨道交通需求、兼容旧系统的,以及具有开放性、维护简单、扩展性良好的先进视频监控系统。     

A Secure Multi-Routing Platform for Ad Hoc Network

In an ad hoc network, it is usually difficult to optimize the assignment of network routing resources using a single type of routing protocol due to the differences in network scale, node moving mode and node distribution. Therefore, it is desirable to have nodes run multiple routing protocols simultaneously so that more than one protocols can be chosen to work jointly. For this purpose,a multiple routing platform for Ad hoc networks is proposed on a higher level of current routing protocols. In order to ensure the security of the platform, a security mechanism and its formal analysis by BAN logic is given. The simulation results of the network performance demonstrate that the proposed multi-routing platform is practicable in some complex applications.     

Web-based survey design for unravelling semi-compensatory choice in transport and urban planning

The estimation of semi-compensatory models is gaining momentum in transport planning in recent years. However, traditional survey methodologies focus on collecting solely compensatory choice data, which leads to information loss when semi-compensatory models are estimated. The present study proposes a novel web-based survey that enables collecting data about the entire semi-compensatory choice process. The web-based environment allows seamless tracking of semi-compensatory choice protocols without interfering with the natural choice process and without introducing problems related to comprehension bias, narrative inconsistency and misinterpretation of the choice protocols. The procedure is applied to rental apartment choice by students and results shed light on semi-compensatory choice by: (1) demonstrating the importance of choice set formation; (2) unravelling the distribution of threshold selection across the population; (3) revealing the linkage between the viable choice-set and the choice.     

Ad Hoc移动自组网路由算法分析

移动Ad Hoc网络(MANET)是由移动节点组成的一个多跳的临时自治性网络,没有预先部署的网络基础设施,主要应用于需要临时、快速组网的场合.在Ad Hoc网络中,节点的随机移动性给网络协议的化设计带来了一定挑战.Ad Hoc网络的吞吐量很大程度上取决于路由协议算法.由于Ad Hoc网络的特殊性,其路由协议的设计与传统的具有固定基础设施的网络有很大不同.首先介绍了Ad hoc网络的特点,重点分析了几种常用的Ad Hoc网络路由协议,并对一些典型的路由协议进行了性能比较,最后得出结论.     

主从式串行通信在汽车装备生产线的应用

介绍了在WINDOWS环境下．采用了Visual C＋＋语言实现PC机与多台MCS-51单片机进行主从式串行通讯方法：同时对设计中硬件、软件设计思想及通信协议工作状态进行了分析和论述。     

网络安全协议比较研究

网络安全协议是以密码学为基础的协议,在网络环境中提供各种各样的安全服务,在网络安全中占据重要的位置。文章介绍了四种常用网络安全协议（包括SSH协议、SSL协议、SET协议和IPSec协议）的组成、服务、安全体系结构、加密方式和易遭受的攻击等,并从四个方面分析比较了它们的特点,对于促进网络安全协议机制的研究和开发具有一定的现实意义。     

某型地空导弹作战模拟训练器的系统设计

某型地空导弹作战模拟训练器采用多微机分布式体系结构,由中央主控单元、搜索指挥单元、发射制导单元构成,通过网络交换设备,以UDP协议实现网络互连。该模拟训练器通过模拟实装面板上的按键和开关,采集学员的操作动作,实现训练评估,故障模拟,目标仿真,雷达仿真,并向学员提供智能操作指导模式,向教员提供航迹与航队编辑模式和故障设置模式,从而全方位模拟实装设备的操作。此外,文章还提出了较为新颖的三维视景的产生与处理方法,航迹与航队编辑方法,以及训练评估算法,对模拟训练器的性能有很大的提升。