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Submitted on: 05 June 2002.
Revised on: 08 August 2002.
Accepted on: 27 September 2002.
___________________IEEE Canadian Journal of Electrical and Computer Engineering
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Submitted on: 16 March 2002.
Revised on: 31 May 2002.
Accepted on: 17 July 2002.
___________________IEEE Canadian Journal of Electrical and Computer Engineering