The Design And Implementation Of The Distributed Multimedia Distance Education System

This thesis focuses on the design and development of a distributed multimedia distance education system on IP network. Based on analyzing the current distance learning system and the practical teaching and learning pattern, a system applicable to practical teaching and learning needs is established, using CSCW (Computer Supported Cooperative Work) theories and technologies. In this paper, a CWE (Cooperative Work Environment) model of the distance education system is provided. In order to enhance the bandwidth utilization factor, a transfer method based on multi-channel is presented. Both the transmission of real-time media stream and time-stamp technologies are introduced to the system to ensure the requirement of real-time characteristic and synchronism, and a simple protocol based on RTP (Real-time Transfer Protocol) and UDP (User Datagram Protocol) is designed. The method, event simulcast, is also brought forward to reduce the data redundancy and expand the collaboration scale of the system. An experiment on campus net has shown that the design and the implementation of this system are practical and feasible.