Creating a Webbased Virtual Laboratory

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Creating a Web-based Virtual Laboratory

• Chen Shihong
• Feb 27, 1999

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Content

• Introduction
• User authentication
• Remote access control
• Conclusion
• Future work

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Introduction

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

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Hardware Structure
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Introduction

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

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User Authentication

• Protect web pages
• Allow authorised user to conduct the remote
  experiments
• Reject unauthorised requests

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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

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User Authentication

• Our method
• A double Client/Server structure
• Using CGI method to generate dynamic HTML

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A double client-server structure
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User authentication model
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Remote Access Control

• What is access conflict ?
• Our approach to solve access conflict

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Remote Access Control Model
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Conclusion

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

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Future work

• Image compression and transmission through
  Internet
• Encryption of transmission
• Integration with Computer Supported Cooperative
  Work