建设跨城域高速宽带校园网络——浙大新校园网络介绍

本文提出一种跨城区的高速宽带校园网络的结构方案,并且结合在浙江大学校园中的实际应用,讨论了建设高速宽带校园网络的一些经验和体会。     

TCP-Rab: a receiver advertisement based TCP protocol

INTRODUCTION The Transport Control Protocol (TCP) pro-vides end-to-end reliable connection-oriented ser-vice over heterogeneous networks. After the fa-mous 1986 network collapse due to network con-gestion, TCP congestion control mechanisms wereintroduced in TCP protocol. The congestion controlmechanisms in early TCP, known as TCP-Tahoe,are discussed in Congestion Avoidance and Control(Jacobson, 1988). Tahoe introduces two basicmechanisms: slow start and congestion avoidance…     

TCP-Rab: a receiver advertisement based TCP protocol

With the evolution of network technologies,the deficiencies of TCP protocol are becoming more and more distinct. The new TCP implementation,called Receiver Advertisement Based TCP(TCP-Rab)proposed here to eliminate these deficiencies,adopts two basic mechanisms:(1)Bandwidth Estimation and(2)Immediate Recovery. Bandwidth estimation is carried out at the receiver,and the result is sent back to the sender via the acknowledgments. Immediate Recovery guarantees high performance even in lossy link. Rab can distinguish the reason for packet loss,and thus adopt appropriate recovery strategy. For loss by network congestion,it will back off its congestion window,and for loss by link errors,it will recover the congestion window immediately. Simulations indicated that Rah has superiority over other TCP implementations.     

基于窗口分割的远程实时授课模型

目前大多远程实时授课系统都通过视频会议技术实现,本文就视频会议系统在进行应用程序共享时,产生屏幕显示黑区的原因进行分析,通过运用窗口分割技术可以有效的解决此类问题,并以此为基础提出相应远程实时授课模型。     

Self-organized architecture for outdoor mobile robot navigation

INTRODUCTION Autonomous mobile robot is a machine able to extract information from its environment and use knowledge about its world to move safely in a meaningful and purposive manner, it can operate on its own without a human directly controlling it (Ehlert,1999). The primary task of a mobile robot is envi-ronmental navigation as basis for more useful tasks. In contrast to indoor mobile robots and industrial manipulation robots both working in relatively static and structured environme…     

建设跨城域高速宽带校园网络——浙大新校园网络介绍

本文提出一种跨城区的高速宽带校园网络的结构方案,并且结合在浙江大学校园中的实际应用,讨论了建设高速宽带校园网络的一些经验和体会。     

一体化课件服务系统的研究与开发

章在分析国内外基于WWW的多媒体远程教学系统的基础上提出了一体化课件服务系统的开发策略，并在一体化分布教学环境IDLE平台开发上进行了有益的尝试，所开发的一体化课件服务系统能够较好地完成远程教育中的教学活动任务。