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Submitted on: 13 August 2006.
Revised on: 05 December 2006.
Accepted on: 18 January 2007.
___________________Jordan Journal of Electrical Engineering
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Submitted on: 21 November 2006.
Revised on: 22 January 2007.
Accepted on: 18 March 2007.
___________________Jordan Journal of Electrical Engineering
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