November 2002 university of tsukuba kddi cooperating organizations cdi ucla sun micro systems
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Interactive Multimedia Education at Distance on the Wideband InterNetworking using Internet Satellite eLearning in Asia based on Instruction Design technology ---University of Tsukuba, MMU, and AIT ---- November 2002 University of Tsukuba KDDI

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November 2002 university of tsukuba kddi cooperating organizations cdi ucla sun micro systems l.jpg

Interactive Multimedia Education at Distance on the Wideband InterNetworking using Internet SatelliteeLearning in Asia based on Instruction Design technology---University of Tsukuba, MMU, and AIT ----

November 2002

University of Tsukuba


Cooperating organizations: CDI, UCLA, Sun-Micro Systems

Slide2 l.jpg

Preceding work InterNetworking using Internet Satellite

E-learning alliance

University of Aizu

University of Tsukuba

Multimedia University

Beijing University

Asian Institute of Technology


Shizuoka Industrial University

Role of instructional designer l.jpg
Role of Instructional Designer InterNetworking using Internet Satellite

Based on results of analysis of

information acquired,

scenario of contents construction is developed and handed to Contents Creator


Instructional Designer

Contents Creator

End User

Educational psychology

Educational cognitive science

Educational technology

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Goal of eLearning Project InterNetworking using Internet Satellite

Web Creator




eLearning Contents


Maintenance Manager

Goal: Obtain the experiences of Instructional/Maintenance Manegements

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Outline of Pilot Experiment / Contribution to Society InterNetworking using Internet Satellite

  • Outline of experiment

    • Implementation of multi-site experiment system to simulate WINDS

      • Dynamic bandwidth sharing with MF-TDMA

      • Mesh topology network

    • Development of e-learning platform and interactive multimedia contents

    • e-learning experiment among universities in Asia

  • Contribution to Society

    • severe shortage of teachers and digital divide in Asia

    • demand for economical education environment

    • enhancement of high grade human resources in Asia

High expectations to WINDS

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Framework of Cooperation InterNetworking using Internet Satellite

  • To Develop of ID based e-learning contents

  • To carry out distance learning

  • To evaluate user demand on WINDS

  • University of Tsukuba, University of

  • Aizu, UCLA, AIT, MMU, and other universities in Japan

  • To implement e-learning platform for distance education.

  • To evaluate application technologies on WINDS

  • KDDI

  • To evaluate basic communication technologies to be implemented on WINDS


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Schedule InterNetworking using Internet Satellite





Experiment system

Launching of WINDS

Implementation of pilot experiment system

Development of utilization experiment system / applications

Development of

pilot experiment applications

Consideration for the development of applications for utilization experiment

Contents of distance learning

Development of e-learning platform and contents

Experiment of distance learning

Experiment by on the pilot experiment platform

Experiment on WINDS

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R&D factors in the area of experiment InterNetworking using Internet Satellite

Development of the Experiment system

  • demand from advanced distance learning to the system

    • difference between education materials in the multi-site environment

    • fluctuation of required communication resources

    • various demands of QoS (delay, discarded rate etc.)

    • multi-point simultaneous participating distance education at laboratory working/practical working

    • dispersion of lectures/education materials

  • construction of economically high efficient system (bandwidth sharing)

    Difficult to implement on the conventional point-to-point and/or star-type network

    Experiment of distance education: promotion in Asia

  • establishment of the instructional design technology in mesh-type topology / satellite network with bandwidth sharing

  • efficient distribution of contents independent of particular model

  • enrichment of software in the educational environment in Asia

    Verification and valuation of trend of the demand with WINDS

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Feature of the experiment system (1) InterNetworking using Internet Satellite

  • Satellite network system

    Experiment in the environment simulating WINDS network is necessary for the early launch of applications suitable for WINDS

  • Implementation of mesh-type topology network

    • capability of flexible configuration in accordance with type of application

  • Dynamic resource management with MF-TDMA

    • incrementation of transmission rate in need of broadband communication

    • efficient use of resources due to bandwidth sharing

  • Implementation of QOS guaranty

First-ever simultaneous practice in Japan

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SKYCAST Lesson InterNetworking using Internet Satellite

Feature of the experimental system (2)

  • e-learning platform

    • pilot experiment system

      • Skycast-Lesson: Video conference software on Windows PC equipped with MPED4 soft encoder

      • star-type application upgrading to mesh-type in future

        Verification and evaluation of application technology toward WINDS

    • utilization experiment system

      • mesh-type topology : both network and applications

      • multi-site multimedia distance education system

        capability of dispersing lecture contents and lecturers

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Construction of Pilot Experimental System InterNetworking using Internet Satellite


Capable of multi-site e-learning / TV conference with

applications on PCs

Efficient use of bandwidth resources due to the management by MF-TDMA

Committed Information Rate (CIR)

= 1Mbps

Maximum Burst Rate (MBR)

= 2Mbps

MBR = 1 Mbps

1.8m VSAT



5.5m Hub station










RF equipment

Access line

Satellite modem

student server / student client

student server / student client

Network Control

Center (NCC) (KDDI)


E-learning devices

Satellite hub station



transfer server

Management server



management/lecturer client

University of Tsukuba

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Mesh-Type Topology InterNetworking using Internet Satellite

Star-type topology

Mesh-type topology






  • Concentrated allocation of lecturers/materials

  • Unsymmetrical network in usual

  • Multicast goes via hub station

  • Easily to distribute lecturers/materials

  • Indifference between hub station and branches

  • Easily to multicast from all the stations

  • ⇒enabling joint development of materials

  • and being a lecturer from both Japan and

  • overseas

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MF-TDMA Method InterNetworking using Internet Satellite







  • Efficient use by bandwidth sharing

  • Necessary band to secure CIR=512kbps with VSAT 10 stations, and MBR= 1 Mbps

  • Point-to-point type

  • 1.024Mbps×10stations≒10Mbps

  • Bandwidth sharing type (minimum )

  • 512kbps X 10stations+512kbps  5.5Mbps






CIR for Station A

CIR for Station C

Bandwidth on Demand

CIR for Station B

Efficient use of bandwidth with above function is mandatory when the number of stations increases as to practical use




Image if bandwidth guarantee

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Linkage to the satellite development InterNetworking using Internet Satellite

  • Future e-learning

  • use of various materials simultaneously

  • various QoS requirement

  • flexible allocation of materials and lecturers

  • Low cost implementation

  • easy system development,

  • however, not to meet requirements of e-learning

  • rapid increment of cost along with

  • increment of stations after practical use

To satisfy requirements of e-learning


  • partly satisfy requirements of e-learning

  • convenient for application development of full system

  • easily to respond to the increment of hub station due to practical use

  • Conventional satellite communication system

  • point-to-point communication (or combination of them)

  • Or

  • star-type topology

  • Or

  • frequent use of double hop communication

  • Utilization experiment system on WINDS

  • full mesh-type system

  • distinction of double hop communication

  • by on-board switch → reduce the time delay

  • broadband communication

  • Pilot experiment system

  • bandwidth sharing by multi-site connection

  • mesh-type topology

  • however recycle of applications

  • developed for star-type network

  • synchronization technology for the simultaneous transmission from multiple sites

  • bandwidth allocation technology for the simultaneous transmission of various media from multiple media

Practical use would be delayed in case of development commenced after the launch of WINDS


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Multi-point e-learning distance education experiment on satellite network

  • A) Effect of “on-site training” in combination with lecture learning and e-learning (Web Based Training)

    • Due to (simulative) ”on-site training” by web technology, the ratio of “remaining in one’s memory” increases from 5% to 70%.

  • B) Application to distance education

    • provide valuable lectures for many student at distance and grasp their understanding at the same time

    • international class, distance education for under-populated area where lecturers are deficient, etc.

  • C) Efficiency of satellite network as a practical environment

    • Implementation of international multipoint lecture/meeting/exchange in high efficiency

    • multi-cast distribution of e-learning contents

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Experimental system satellite network (distance learning and learning management with WebCT)

Actual scene of distance learning

Screen of materials

Automatic marking system

Progress of learning

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Java Campus Program satellite network

Purpose of the class: to learn JAVA Programming language

To acquire the license provided by Sun through passing the examination in the class

Enhancement of Marketability of students at employment market

Due to higher license necessity of working experience

Attempt of acquiring educational finance by tying-up with software companies to organize a framework

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Class Room satellite network



Class Room Images

Actual scene of distance learning







Class Room





On Demand Server

Client for Lecturer

Relay Server

On Demand Server

Client for Lecturer

Relay Server

Servers for Distant Education

Servers for Distant Education


LMS Server system

LMS Server system



U. Tsukuba