1. Creating a Web-based Virtual Laboratory Chen Shihong Feb 27, 1999

2. Content Introduction User authentication Remote access control Conclusion Future work

3. Introduction How to create a Virtual Laboratory implementation of local instrument control using LabVIEW implementation of remote instrument control through Internet

4. Hardware Structure

5. Introduction The problems we met during developing this project 1) User Authentication 2) Remote Access Control

6. User Authentication Protect web pages Allow authorised user to conduct the remote experiments Reject unauthorised requests

7. 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

8. User Authentication Our method A double Client/Server structure Using CGI method to generate dynamic HTML

9. A double client-server structure

10. User authentication model

14. Remote Access Control What is access conflict ? Our approach to solve access conflict

15. Remote Access Control Model

19. Conclusion Two steps to create a Virtual lab We have developed one remote laboratory experiment (Oscilloscope Experiment) http://vlab.ee.nus.edu.sg/vlab

20. Future work Image compression and transmission through Internet Encryption of transmission Integration with Computer Supported Cooperative Work