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A Multicast Middleware for the Remote Educational Systems  

Byun, Sang-Seon (고려대학교 컴퓨터학과)
Jin, Hyun-Wook (고려대학교 컴퓨터학과)
Yoo, Hyuck (고려대학교 컴퓨터학과)
Publication Information
Journal of KIISE:Computing Practices and Letters / v.9, no.1, 2003 , pp. 100-108 More about this Journal
Abstract
By choosing Multicast for transmission of educational contents in the Remote Educational System, we can reduce the server load and increase network bandwidth utilization. We design and implement Multicast Middleware for the Remote Educational System in this paper. There are three characteristics in this Multicast Middleware: 1) Through Centralized Multicast Group Management for passive members, it allows a host to make multicast group, which is composed of receivers, called Group Member and who are chosen by the host, called group Maker. Because, all groups are created by the Group Maker in Centralized Group Management, Group Member's join action will be passive 2) Maintenance and recovery of multicast group information in order to restore from exception and crash; the maintenance and recovery mechanism of Group Maker is distinct from that of Group Member. 3) The mechanism which enables to transmit large size multimedia data through multicasting and remove additional copy operation through shared buffer. Fragmentation/de-fragmentation for large data delivery results in additional copy operation in user level. But by using user level shared buffer, it can be done without user Bevel copy operation. By applying to Remote Educational environment which consists of 30 PCs and Fast Ethernet, we can examine the efficiency of this middleware, which can transmit 18frames/sec movie which resolution 320 $\times$ 120 pixels, 128Kbps encoded sound data and some text data.
Keywords
Multicast; Centralized Group Management; Passive Member;
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