Research, And Sharing Of Technology Based On P2p Architecture, Network Courseware On Demand

P2P(Peer-to-Peer) network is an important innovation of the development of the Internet in recent years. Through utilizing this technology, People in Internet can connect directly to each other without any intermediary. After these years of continuous development, P2P network is used more and more widely, and this concept has been deeply in people's mind.Nowadays, Information Technology is entering education field. Many schools and universities are actively carrying out E-learning projects. In E-learning systems, course resources and services are main teaching and learning style. But centre-server-based course resource providing can not meet the increasing learning requests from students. At the same time, CDN is very expensive to extend its cache servers and network bandwidth.The second part of the thesis summarizes the basic concepts and main features of P2P network, including some important areas of application and its mainstream structures. The third part of the thesis emphasizes on P2P based Courseware on Demand technology. Through reviewing the general course-on-demand technology and P2P-based content transferring technology, we propose the novel method of P2P overlay network construction technology for course-on-demand, especially the construction algorithm design based on Chord network. On this basis, we design the segment-based P2P course-on-demand system, including segment-design strategy and overlay network nodes optimized selection and maintenance strategy.The forth part of the thesis emphasizes on P2P-Instant-Messaging-architecture-based courseware sharing technology. Firstly, this thesis summarizes P2P IM communication system and key technology, and describes the P2P IM development status and trends, especially elaborating on research and development of Courseware File sharing technology oriented to P2P IM. We firstly design the one to one courseware-sharing module. And then we design and implement the multiple to multiple courseware-sharing module. We firstly analyze the main mechanism and implementation principle of one to multiple Courseware File-sharing module, including sharing program design, receiving program design and experiment results. Furthermore, from the analysis of some defects on one to multiple courseware-sharing module, multiple to multiple courseware-sharing module are introduced and implemented in this paper.Finally, from our research experiences and related survey, we analyze the prospective research direction and challenges in this field.