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研究生:張育凱
論文名稱:基於P2P即時媒體串流技術運用在遠距教學之研究與實現
論文名稱(外文):Research and Implementation of Distance Learning Based on P2P Live Media Stream
指導教授:黃能富黃能富引用關係顏雲生顏雲生引用關係
學位類別:碩士
校院名稱:佛光大學
系所名稱:資訊學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:英文
論文頁數:90
中文關鍵詞:P2P遠距教學系統
外文關鍵詞:P2PDistance learning system
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遠距教學是政府積極在推廣的一種新型教學方式,它是指使用影音多媒體和網際網路等傳播媒體的教學模式,突破了時空界線,有別於傳統需要安坐於教室的教學模式,將人類行為中非常重要的互動關係,經由網路數位化系統的協助,在點對點,或是點對多點之間進行全方位的傳遞,遠距教學在大專院校裡實施的成果相當顯著,但在國中小來說,主要還是以傳統教學為主。近幾年,在政府的政策帶動下,班班有電腦已是教室的標準配備,多數學校正朝向校園多媒體教學方向在前進,希望達到班班有單槍投影機的目標,充實設備,能讓教師多利用多媒體科技,融入教學裡,加速學生學習的能力,獲取更多的知識。遠距教學類型輔以視訊教學和運用高速資訊網路,可以即時群播、虛擬教室或課程隨選等方式,以輔助學校行政以及教師教學,讓國小教學能更多元化,提升學生學習力。
本文實作P2P Live Media Stream,是一套以P2P架構為主的遠距視訊系統,並與國家高速網路與計算機中心開發的Co-life視訊會議系統及Google子公司開發的網路視訊會議系統Marratech兩套軟體做實際比較,從視訊流暢度、穩定性、自我恢復情形及頻寬傳輸狀況上來做比較,證明P2P Live Media Stream運用在校園內,是一套很理想、很實用的系統,而且可以融合各類型的視訊教學方式,供學校做多樣化的教學。
Distance learning is a brand-new pedagogy which the government is energetically popularizing right now. Different from the traditional teaching modes which need students gathering in class, distance learning is a pedagogy using multimedia and network service to eliminate the limitations of time and space. Furthermore, distance learning uses the network digital system to send messages point-to-point or point-to-multipoint. Presently, distance learning has gained remarkable results in universities and colleges. However, traditional teaching modes are still often used in junior and elementary schools. In recent years, the government aims to make computers standard equipments in each and every classroom. Most schools are heading to multimedia teaching, hoping that projectors can also be equipped in every classroom. Teachers are expected to make good use of media technology in teaching nowadays; thus, students’ learning capabilities will be improved and will obtain more knowledge. By the assistant of video teaching and high-speed network, distance learning can set up virtual classrooms, make course on demand (COD) practicable and reach the goal of multicast. Moreover, we expect distance learning can help the schools’ administration and teachers’ instructions to make teachings in elementary schools more variable.
This paper experiments the operation of P2P Live Media Stream, a distance video system based on P2P structure. In addition, we also compare it with Co-Life Video Conferencing System developed by the National Center for High-Performance Computing and Marratech Online Video Conferencing System developed by a subsidiary company of Google. The comparisons focus on the smoothness of video signals, stability, connection recovery and transmission situations. We prove that P2P Live Media Stream is an ideal and feasible system which can be used in campuses. Furthermore, it combines all kinds of video teaching modes and benefits the teaching diversity in campuses.
Contents
摘要………………………………….………………………………………..………II
Abstract………………………………………………………………………..……..III
Contents…………………………………………………………………………….....V
List of Figures…………………………………………………………………….....VII
List of Tables…………………………………………………………………….........X
Chapter 1 Introduction………………………………………………………………...2
1.1 Research Background………………………………………………………...2
1.2 Research Motivation………………………………………………………....3
Chapter 2 Related Works…………….………………………………………………...7
2.1 Discussions of Distance Learning in Taiwan………………………………...7
2.2 The Application of Distance Video on Education……………………………8
2.2.1 Co-Life Video Conferencing System………………………………………9
2.2.2 Marratech Online Video Conferencing System…………………………...12
2.2.3 The Comparison of P2P LMS, Co-Life and Marratech…………………...13
Chapter 3 P2P Live Media Stream….………………………………………………..15
3.1 The Structure of CoolStream………………………………………………..16
3.1.1 Basic Components.………………………………………………..............17
3.1.2 Multiple Substreams.………………………………………………...........18
3.1.3 Buffering…………….………………………………………………........19
3.1.4 Overlay Construction.……………………………………….………........20
3.1.5 Content Delivery…….………………………………………………........21
3.2 System Dynamics…….………………………………………………..........23
3.2.1 Peer Adaptation…….………………………………………………..........24
3.2.2 Peer Dynamics…….………………………………………………............25
3.3 The General Situation of System Operation…………………………...........28
Chapter 4 The Deployment of P2P LMS……………………………………….........31
4.1 The Usage of P2P LMS……………………………………………..............31
4.2 The Structure of Deployment……………………………………….............32
Chapter 5 Experiment Results………………………………………………..............39
5.1 Experiment Scenarios and Measurement Methods…………………............39
5.1.1 Scenarios……………………………………………...…………..............39
5.1.2 Measurement Methods………………………………...………….............39
5.2 Experiment Results……………………………………...………….............41
5.2.1 The Experiment in LAN……………………………...…………...............42
5.2.2 The Experiment in WLAN……………………….....………..…...............51
5.2.3 The Experiment in MAN……………………………...…………..............60
5.2.4 The Experiment in WAN……………………………...…………..............69
5.3 The Situation of Connection Recovery………………...……….…..............78
5.3.1 The Experiment Results of Connection Recovery…...……….…..............78
5.4 Overall Comparison………………...……….…...........................................82
Chapter 6 Conclusion and Future Works…...……….……..........................................86
References………………...……….…........................................................................88
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