Network Access Architecture Providing High Quality Business Education

Transcription

1 Network Access Architecture Providing High Quality Business Education Sok Hwan Cho (KAIM) Sok Pal Cho (Sungkyul University) 84 th International Conference 2012,Denver, Colorado, USA-29 th July to 3 rd August 2012

2 Network Access Architecture I Terminal Student Network Provider Service Provider Learning Contents Server Teacher Interface Circuit Switching Packet Switching Virtual Circuit Virtual Circuit The component of education on the cyberspace classifies greatly three parts those are network provider, service provider, and terminal.

3 Network Provider Network Provider (Circuit Switching Network, Packet Switching Network, etc.) : Circuit switching network is for traditional telephone network, packet switching is for internet network based on TCP/IP)

4 Network Access Architecture I Application in Internet TCP IP

5 Quality issues of network architecture. Network performance Refer to the service quality of a computer communications products- how well the network is performing under heavy traffic loads. Fast deliver the contents to the user Broadband available, making every website load up much faster Greater throughput for fast connection Throughput is the number of messages successfully delivered per unit time

6 Circuit Switching Network Node Circuit switching network Quality factors of circuit switching are evaluated by a measure of the reject calls - S/N ratio (Signal to Noise ratio) - Echo by impedance mismatching -H/W limitation -etc.

7 Packet Switching(datagram) of Network Node Switching at the network layer in the Internet is done using the datagram approach to packet switching Quality factors of packet switching network node Bit rate QoS, Data throughput, Stability, Connection time, etc.

8 Content server to user(student/teacher)

9 Application Layer

10 MSS: Multiservice Switching System MGC:Media Gateway Controller Enterprise Service Network Signaling Gateway Softswitch (MGC) Trunk Gateway Service Gateway Policy Management Servers Service Controller MSS Packet Network ( IP based network) MSS ATM switch or IP/MPLS Router Service Controller Softswitch Trunk Gateway SS7 based IN STP PSTN Local Exchange Softswitch Access Gateway Internet Wireless Network PBX

11 Home Service Personal based Services Car Service Office Service Video Service Contents IPTV Location Web Integrated Service Framework Broadcast Provider Home Service Home Service Person(students /teacher Home Service ISP Mobile Office Education Contents Provider Education Service Provider

12 Network service quality on network access architecture Problem Reason Availability Network availability Slow start, channel change time Network performance Picture freeze Network performance Video/audio availability & quality Packet loss & jitter Unobserved bandwidth Fast channel change Video/audio synch. System configuration

13 Throughput The effective number of data flow transported within a certain period of time. Specified as bandwidth in some situations. The bigger the throughput of the network, the better the performance of the system is. In order to improve the resource efficiency, the throughput of network should often be maximized.

14 Dependant factors on network quality Speed (Throughput, Download, Data Quantity = Volume) Increase through put Reducing download time Real time process MPEG-1: 1.544Mbps MPEG-2 : 2.048Mbps Moving Image Real time. High definition, High resolution Real time

15 Bit rates Decimal prefixes (SI) Name Symbol Multiple kilobit per second kbit/s to third power megabit per second Mbit/s 10 6 gigabit per second Gbit/s 10 9 terabit per second Tbit/s

16 Jitter between regions Jitter varies with loading RTT: Return To Time, Uses ping facility of TCP/IP 75ms=Good 125ms=Med 225ms=Poor If Africa is connected with East Europe including Jitter, it delays 265ms. 16

17 Phase 3 Contents Provider Learning Objects (Contents) Learning Object Evaluation *1.Contents quality Learning goal alignment Feedback and adaptation Motivation Presentation design *2.Interaction usability Accessibility Standards compliance

18 *1. Contents quality I in Learning Object Evaluation General evaluation standards of content quality Validity: clear, accurate contents, unbiased Potential effectiveness as a teaching-learning tool Ease of use Contents takes places always and everywhere and different context, not only in classroom Contents is informal and non-formal, it could be taken place at home, at workplace.

19 Contents quality II Physical factors of contents quality Quality factors Content availability Content quality Channel change time Contents Availability of channel Related factors: content provider, multicast core, video source, access network, campus & home network Quality of audio & video Related factors: multicast core, video source, access network, campus & home network Student and teacher wait time while changing channels Related factors: middleware, multicast core, UDP performance

20 Ratings of contents quality evaluation[by LORI] Rating 1; serious inaccuracies, biases, omissions Rating 3: deemphasizing some key points in a way that could mislead learners. Rating 5: emphasizing key points with sensitivity using an appropriate level of detail.

21 *2. Interaction usability in Learning Object Evaluation Interaction usability Describes how easy or difficult it is for learners to move around in a learning. Describes the ease of navigation, predictability of the user interface, and the quality of the interface help features.

22 Interaction on the network Student to student Student to content Faculty to student Faculty to content Interaction tools Discussion boards, Chat rooms, Mass s to class members Streaming audio and/or video Instant messaging, Blogs, Wikis

23 Categories of Web documents

24 Static document Delivered document to document, it caused data traffic heavy load on the network channel. If you use markup language such as static document like html for education web contents, it cause heavy load traffic.

25 Active document If education web contents use active language like Java, delivering time is fast and network channel traffic is too low. This is very fast speed.

26 Education Service Architecture Satellite Channel Learner Channel monitoring Learners

27 Major issues to meet end-to-end QoS Service Oriented Architecture QoS Aware Communication Protocols Resource Self-management Supporting Tools

28 delivery

29 Browser architecture

30 Classification of media use in multimedia systems Type of media Hybrid System Time-dependent and time- independent Time- dependent Time-independent Integrated, Digital System Audio/Video Applications Desktop Publishing n Media 1 Media Number of media Video server Text Editors Full Media Integration Integration of media No Media Integration

31 Security Quality Security quality should meet fully data protection compliant I&A procedure should meet the below security quality Authentication quality Authorization quality Accounting quality

32 Structural Frameworks Key theme of NSP Control Plane: Identity Processing User ID Customer ID Service ID Comm. ID Require AAA Mobile Phone Nr Content Owner ID Provider ID student 1 Fixed Phone Nr Media ID Session ID User Id: Earth-Korea- Man:LeeChaesub -19yy-mm-dd - Certified by UN - student 2 student 3 WiFi WiBro Id Cable/ IPTV Id TCP/UDP Port ID IP Address ATM/Ether net ID MAC ID E.164 ID student 4 Internet Id Line ID

33 I&A must satisfy the quality of service. I&A is to recognize an individual and validate the individual s identity. Procedure I&A I & A Physical I&A Password Biometrics PKI H/W token Face recognition I&A Finger Image I&A iras Scan I&A Magnetic card I&A Smart card I&A Keying token I&A

34 Symmetric-key cryptography

35 User (Learner/ Teacher) Interface Learning System Call Operation 1 Operation 1 Check AAA OK Call Operation 2 Operation 2 Error message Error message Check AAA Error Create Error message

36 Conclusion

37 Network Architecture providing total quality Application Service Servers Windows/Linux Learner Profile Client Web Browser Execution Engine Execution Engine Loader PMP/PDA/Android/2G /3G/4G Hand Set Learner Profile Client Terminal Device GUI Client Execution Engine Execution Engine Loader Cross-Domain Networking AAA Platform glue Camera Service Service Control Server Semantic Transform Learner Profile Server Device DB VoD Service Contents Transform Syndicator Service Manager Execution Engine Loader Service DB User DB Video Phone Service Service Ensembler Session DB Intelligent converged MM terminal Network High speed & Broadband network Good contents

38 Enhanced network architecture Competitive network: High speed/broadband network improved efficiency and cost effectiveness) for business learning practices. Learner oriented contents (to establish between teaching staff and students, better understanding and greater learner satisfaction) High quality web-based learning for students to create screencasts directly from their browser and make the video available online so that the viewers can stream video directly.

39 Integrated business education service/providing motivation to learner Converged intelligent MM terminal Cost-effectiveness (in realization, process and quality, etc.) Continuous improvement