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The IRI-h Objectives 1

Platform Independent Services: using JAVA technology

Multi-participant Audio/Video: using Java’s JMF framework

Collaboration Engine with Multiple-Platform-Tool-Source:makes available the rich set of applications running on Windows/UNIX environments.

Delivery to the home/office: users can access the session over a regular Internet connection using the latest generation of high speed at home Internet connections.

Recording/Replay: indexed by session events

Support multiple learning modes: lecture, demonstration, collaborative learning, computer-based labs, student team project, study sessions

Virtual Rooms: the class can be divided into groups by assigning each group a virtual meeting room. Students can move from room to room and join in different on-going discussions.


Platform Independent Services: using JAVA technology

Multi-participant Audio/Video: using Java’s JMF framework

Collaboration Engine with Multiple-Platform-Tool-Source:makes available the rich set of applications running on Windows/UNIX environments.


Recording/Replay: indexed by session events

Support multiple learning modes: lecture, demonstration, collaborative learning, computer-based labs, student team project, study sessions


IRI-h Network Layout

G

Multicast disabled site

UDP tunnel

Gateway

High SpeedNetwork (Multicast)

Gateway

High SpeedNetwork(Multicast)

S1 S2

S3P1

Low Bandwidth with multicast

Multicast

P3

High Delay without multicast

UDP tunnel

P2

Low Bandwidth without multicast

UDP tunnel

Intranet

Multicast

P4P5

P6P7 P8P9


G


UDP tunnel

Gateway


Gateway


S1 S2

S3P1


Multicast

P3


UDP tunnel

P2


UDP tunnel

Intranet

Multicast

P4P5

P6P7 P8P9

IRI-h Software Architecture

SMLog Server

Group Communication server

Gateway

Token Managers

Observers

SP

Audio Video

Sharing Tool

Annotation

Pointer

RcvSnd

SndSnd

RcvRcv

Gateway servers

TCP connection

Thread relationship

Service manager

Main Thread

Snd: SenderRcv: ReceiverSP: Session ParticipantSM: Session Manager


SMLog Server


Gateway

Token Managers

Observers

SP

Audio Video

Sharing Tool

Annotation

Pointer

RcvSnd

SndSnd

RcvRcv

Gateway servers

TCP connection

Thread relationship

Service manager

Main Thread


IRI-h Startup Scenarios

E, F: Automated Startup by Java Server B: Manual Join by contacting the Directory Server

H: Session Manager manually invoked G: Manual Join by contacting H directly

SP Startup

B

SPStartup Applet

A

G

SP

E

SPHA

H

SM

F

HA SM

C

Java Server

D

Directory Server

SM: Session ManagerSP: Session ParticipantHA: Host AmbassadorX Y: X initiates protocol with YX Y: X spawn Y

server




SP Startup

B

SPStartup Applet

A

G

SP

E

SPHA

H

SM

F

HA SM

C

Java Server

D

Directory Server


server

Presentation ModePresentation Mode

Collaboration ModeCollaboration Mode

Future Tasks 1

• Gateway– Target bandwidth setup

• uplink (to gateway) 128-512 Kbps

• downlink (from gateway) 256-740Kbps

– Tunneling for lack of multicast

– Format transcoding and/or data rate limiting.

– Bandwidth management

• Inter-Stream Synchronization

• Quality of Session management

Future Tasks 1







• Inter-Stream Synchronization

• Quality of Session management

• Late-Join mechanisms (service state)

• Record/Replay

• Semi-reliable application access protocols

• Multiple Rooms

• Feedback: network monitor, “smiley face”

• Additional Features: classroom video, call on student, survey, PA channel for multiple rooms, exam tool, remote ipv

Future Tasks 2• Late-Join mechanisms (service state)

• Record/Replay

• Semi-reliable application access protocols

• Multiple Rooms

• Feedback: network monitor, “smiley face”


Future Tasks 2Performance

• IRI-h Scalability: scalability tests on 35 machines with no incremental degradation in performance (video/audio/IPV reception).

• Delay: Audio/Video 750ms, IPV 1800ms

• Bandwidth: 1.5 Mb/s with three video, audio, ipv, pointer and annotation

• StartUp: initial interface 1 minute, video 25s, audio (10s), ipv (5 s), pointer(30ms), private services (3 s), class creation (10s)

• Refresh rates: Video 15 frames/sec, IPV 5s for full screen

Performance






Platform/environment management including late join/early leave: A student can join an on-going session at any time and fully participate in that class.

Situational awareness: Students, instructors and technical engineers are made aware of the current operating environment and are notified about noteworthy changes or unusual situations.

Class Management: instructor handouts/student notes, call by name, polling, classroom video, attendance, auto session start, class monitoring, enrollment

Shared Common Experience: The position and focus of the windows displayed on the student’s workstation is coordinated with the instructor’s machine.

Scalable: 100 participants

Easy of Use: Ease of installation, Quick class join

The IRI-h Objectives 2 Platform/environment management including late

join/early leave: A student can join an on-going session at any time and fully participate in that class.





Easy of Use: Ease of installation, Quick class join


Login/Discussion ModeToken controlled tools Private panel

Shared view

Room cards

Audio control

Annotation token holder utilitiesVideo control

Private panelLogin box

Class name and semester


Shared view

Room cards

Audio control




Presentation ModePresentation Mode


Platform Independent Services: using JAVA technology Multi-participant Audio/Video: using Java’s JMF framework Collaboration Engine with Multiple-Platform-Tool-Source: makes

available the rich set of applications running on Windows/UNIX environments.


Recording/Replay: indexed by session events Support multiple learning modes: lecture, demonstration, collaborative

learning, computer-based labs, student team project, study sessions Virtual Rooms: the class can be divided into groups by assigning each

group a virtual meeting room. Students can move from room to room and join in different on-going discussions.


Platform Independent Services: using JAVA technology Multi-participant Audio/Video: using Java’s JMF framework Collaboration Engine with Multiple-Platform-Tool-Source: makes

available the rich set of applications running on Windows/UNIX environments.


Recording/Replay: indexed by session events Support multiple learning modes: lecture, demonstration, collaborative

learning, computer-based labs, student team project, study sessions Virtual Rooms: the class can be divided into groups by assigning each

group a virtual meeting room. Students can move from room to room and join in different on-going discussions.


G


UDP tunnel

Gateway


Gateway


S1 S2

S3P1


Multicast

P3


UDP tunnel

P2


UDP tunnel

Intranet

Multicast

P4P5

P6P7 P8P9


G


UDP tunnel

Gateway


Gateway


S1 S2

S3P1


Multicast

P3


UDP tunnel

P2


UDP tunnel

Intranet

Multicast

P4P5

P6P7 P8P9


SMLog Server


Gateway

Token Managers

Observers

SP

Audio Video

Sharing Tool

Annotation

Pointer

RcvSnd

SndSnd

RcvRcv

Gateway servers

TCP connection

Thread relationship

Service manager

Main Thread



SMLog Server


Gateway

Token Managers

Observers

SP

Audio Video

Sharing Tool

Annotation

Pointer

RcvSnd

SndSnd

RcvRcv

Gateway servers

TCP connection

Thread relationship

Service manager

Main Thread





SP Startup

B

SPStartup Applet

A

G

SP

E

SPHA

H

SM

F

HA SM

C

Java Server

D

Directory Server


server




SP Startup

B

SPStartup Applet

A

G

SP

E

SPHA

H

SM

F

HA SM

C

Java Server

D

Directory Server


server

Discussion ModeToken controlled tools Private panel

Shared view

Room cards

Audio control




Discussion ModeToken controlled tools Private panel

Shared view

Room cards

Audio control



Class name and semester Presentation Mode

Token controlled tools Private panel

Shared view

Room cards

Audio control




Presentation ModeToken controlled tools Private panel

Shared view

Room cards

Audio control



Class name and semester Collaboration Mode

Token controlled tools Private panel

Shared view

Room cards

Audio control




Collaboration ModeToken controlled tools Private panel

Shared view

Room cards

Audio control




Performance Results 1• Tool Sharing (IPV)

– The performance of IPV depends on the following activities.• Capture images of the windows in the application being shared,

• Compare these images with previous images to see if the image has changed (for removing temporal redundancy),

• Compress the image,

• Transfer,

• Decompress,

• Display images on client machine.

– Capture time is a function of the image size only (measured around 220 msec for a 700x700 image on a Unix machine).

– Comparison time is between 300-500 msec.

Performance Results 1• Tool Sharing (IPV)

– The performance of IPV depends on the following activities.• Capture images of the windows in the application being shared,

• Compare these images with previous images to see if the image has changed (for removing temporal redundancy),

• Compress the image,

• Transfer,

• Decompress,

• Display images on client machine.

– Capture time is a function of the image size only (measured around 220 msec for a 700x700 image on a Unix machine).

– Comparison time is between 300-500 msec.

• IPV (continued)– Compression time is a function of the compression algorithm and

ranges from 1000 to 3000 msec. since this is performed in software.

– Transmission time depends on image type and ranges from 20msec for text images to 350 msec. for picture images (using PNG).

– On the receiver's side, performance is dominated by the time to decompress which is around 500 msec.

• IRI-h Scalability– scalability tests have been performed by running IRI-h on all

Intranet machines (35) with no degradation in performance (video/audio/IPV reception).

Performance Results 2• IPV (continued)

– Compression time is a function of the compression algorithm and ranges from 1000 to 3000 msec. since this is performed in software.

– Transmission time depends on image type and ranges from 20msec for text images to 350 msec. for picture images (using PNG).

– On the receiver's side, performance is dominated by the time to decompress which is around 500 msec.

• IRI-h Scalability– scalability tests have been performed by running IRI-h on all

Intranet machines (35) with no degradation in performance (video/audio/IPV reception).

Performance Results 2Future Work

• Gateway– target bandwidth setup

• uplink (to gateway) 256Kbps• downlink (from gateway) 1 Mbps.

– Tunneling, and integration within current session/resource management framework.

– format transcoding and/or data rate limiting.

• Inter-Stream Synchronization• Late-Join mechanisms (service state)• Record/Replay• Quality of Session management• Semi-reliable application access protocols

Future Work

• Gateway– target bandwidth setup

• uplink (to gateway) 256Kbps• downlink (from gateway) 1 Mbps.

– Tunneling, and integration within current session/resource management framework.

– format transcoding and/or data rate limiting.

• Inter-Stream Synchronization• Late-Join mechanisms (service state)• Record/Replay• Quality of Session management• Semi-reliable application access protocols



Class Management: instructor handouts/student notes, call by name, polling, classroom video, attendance



The IRI-h Objectives 2 Platform/environment management including late

join/early leave: A student can join an on-going session at any time and fully participate in that class.


Class Management: instructor handouts/student notes, call by name, polling, classroom video, attendance




Poster on4x8 footposterboard

The IRI-h Objectives 1 Platform Independent Services: using JAVA technology Multi-participant Audio/Video: using Java’s JMF framework Collaboration Engine with Multiple-Platform-Tool-Source:

makes available the rich set of applications running on Windows/UNIX environments.


Recording/Replay: indexed by session events Support multiple learning modes: lecture, demonstration,

collaborative learning, computer-based labs, student team project, study sessions






Scalable: 100 participants Easy of Use: Ease of installation, Quick class join



G


UDP tunnel

Gateway


Gateway


S1 S2

S3P1


Multicast

P3


UDP tunnel

P2


UDP tunnel

Intranet

Multicast

P4P5

P6P7 P8P9


SMLog Server


Gateway

Token Managers

Observers

SP

Audio Video

Sharing Tool

Annotation

Pointer

RcvSnd

SndSnd

RcvRcv

Gateway servers

TCP connection

Thread relationship

Service manager

Main Thread





SP Startup

B

SPStartup Applet

A

G

SP

E

SPHA

H

SM

F

HA SM

C

Java Server

D

Directory Server

SM: Session ManagerSP: Session ParticipantHA: Host AmbassadorX Y: X initiates protocol with YX Y: X spawn Y server


Shared view

Room cards

Audio control




Presentation Mode

Collaboration Mode

Future Tasks 1







• Inter-Stream Synchronization• Quality of Session management

Performance






• Late-Join mechanisms (service state)• Record/Replay• Semi-reliable application access protocols• Multiple Rooms• Feedback: network monitor, “smiley face”


Future Tasks 2