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Distributed, Collaborative Processing System (COBRA Virtual Office). What's the Deal?. COBRA. Distributed, Collaborative Processing Systems –Some Prospects. E-Commerce B2B and B2C -Collaborative Product design -Collaborative Product decision. Group communication -Net meeting

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Distributed, Collaborative

Processing System

(COBRA Virtual Office)



Distributed, Collaborative

Processing Systems –Some Prospects

E-Commerce

B2B and B2C

-Collaborative Product design

-Collaborative Product decision

Group communication

-Net meeting

-PDA, PCS etc

-Virtual class rooms

Software Engineering Environments

-Distributed Collaborative system design space

Personal entertainment

-On-line video games


Different Locations? Not a Problem Anymore!

One Design

Multiple users at different locations can work on one design collaboratively

and simultaneously.

No travel and no delay.

Higher Productivity,

Lower cost,

Better Traceablity.


COBRA= Collaborative behavioral Requirement and Architecture

  • FOR

  • Modeling requirements

  • Designing architecture

  • Evaluating existing architectures/components if

  • they can meet new requirements

  • Monitoring projects



History of COBRA

  • Started in 1994 as a research prototype

  • Initial implementation in c/c++ and tc/tlk

  • Current implementation in Java


  • Main Challenges seen previously

  • Poor documentation of the system

  • Insufficient communication when projects

  • passed from semester to semester.

  • Poor communication among members resulting in integration problem

  • Reinventing the wheel due to poor code

  • comments.


Platform Independency

The system is implemented using Java/JavaBeans so as to enhance platform-independence, interoperability, composability (plug-and-play), and distributability.


System Applications

The system will be used to model the behavior of a variety of system types, including a mobile communication system.

Hence, we will be using a particular scenario for the particular system chosen to be modeled.



Cobra Virtual Office Functionalities

  • Constructing Augmented Petri-Net (FSM) for System Behavior Modeling

  • Constructing PERT Chart for Project Scheduling and management


Constructing Augmented Petri-Net

As a test-bed, we are working on the modeling and analysis of system behavior using Augmented Petri Net (APN), a formalism which is expressively more powerful than Finite State Machines.


More about Augmented Petri-Net

A form of FSMs, first proposed by C. A. Petri in 1962

A notation for defining abstract concurrent processes

Primitives:

Place

Transition

Token

T

When all input places of a transition are enabled (i.e., with a token) and the external stimulus associated with the transition occurs, the tokens move from the input places to output places


T1

T2

Concurrency

T2

T1

T3

Synchronization

T1

T3

Fundamental notions:

Sequencing

T2


ONTARIO

Site

TEXAS Site

NORTH CAROLINA

Site




Collaborative Processing

(view from North Carolina)

Public Window

NC Window


Simulation

The system’s simulation functionality represent the behavior of Petri-net



Another Aspect of the Virtual Office

Monitoring and Scheduling Projects

Using PERT Chart


If you are a project manager,

do you prefer these, or...


This simple solution

Provided by Virtual Office


Why Do We Need PERT Chart

  • Allows users to express time dependencies for project tasks

  • Analyze the project critical path

  • Tracks project progress to ensure that delay is recognized

  • Provides a road map for a project manager


How to represent a pert chart in this system
How to Represent a PERT Chart in This System

  • The COBRAVirtual Office has functionality of constructing Augmented Petri-Net (APN), and allows system behavior simulation

  • Traditional PERT Chart representation lacks dynamic functionality to monitor project progress

  • A mapping from PERT chart to Augmented Perti-Net is proposed for the ease of project progress simulation


Programming

Test Code

Test System

2

4

8

10

Create Schedule

20

20

10

10

Training

User Test

1

7

9

11

Write Man

5

5

10

15

Buy Hardware

15

3

5

5

Installation

Conversion

6

An Example

  • Numbered rectangles are nodes that represent events or milestones

  • Directional arrows represent tasks that must be completed sequentially

  • Diverging arrow directions indicate possibly concurrent tasks

  • Dotted lines indicate dependent tasks that do not require resources

Figure 1: PERT Chart

Representation


@now>=t0+9 ۸ ~done /reminder

@now>=t0+18 ۸ ~done /reminder

@now>=t0+18 ۸ ~done /reminder

@now>=t0+9 ۸ ~done /reminder

1

2

4

8

10

Code test done

Schedule done

Programming done

system test done

@now>=t0+13 ۸ ~done /reminder

@now>=t0+4۸ ~done /reminder

@now>=t0+4 ۸ ~done /reminder

@now>=t0+13 ۸ ~done /reminder

5

7

@now>=t0+9 ۸ ~done /reminder

Hardware bought

man done

Training done

1’

3

9

11

@now>=t0+4 ۸ ~done /reminder

Installation done

User test done

5’

6

conversion done

Figure 2: APN

Representation

An Example (Cont’)

  • Numbered rectangles are nodes that represent states of a project

  • Directional arrows represent moving from one state to another

  • Vertical bars represent transitions from one state to another



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