Creating a Web-based Virtual Laboratory

Chen Shihong

Feb 27, 1999

Content

• Introduction

• User authentication

• Remote access control

• Conclusion

• Future work

Introduction

How to create a Virtual Laboratory

• implementation of local instrument control using LabVIEW

• implementation of remote instrument control through Internet

Hardware Structure

Introduction

• The problems we met during developing this project

1) User Authentication

2) Remote Access Control

User Authentication

• Protect web pages

• Allow authorised user to conduct the remote experiments

• Reject unauthorised requests

User Authentication

• Two methods for implementation of Remote Instrument Control though Internet

- Single client/server structure using CGI

- Double client/server structure using CGI and TCP/IP socket

User Authentication

• Our method

• A double Client/Server structure

• Using CGI method to generate dynamic HTML

A double client-server structure

User authentication model

Remote Access Control

• What is access conflict ?

• Our approach to solve access conflict

Remote Access Control Model

Conclusion

• Two steps to create a Virtual lab

• We have developed one remote laboratory experiment (Oscilloscope Experiment)

http://vlab.ee.nus.edu.sg/vlab

Future work

• Image compression and transmission through Internet

• Encryption of transmission

• Integration with Computer Supported Cooperative Work