Submitted on: 12 May 2005.
Revised on: 11 July 2005.
Accepted on: 03 September 2005.
___________________International Journal of Automation and Control
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Submitted on: 26 June 2015.
Revised on: 08 September 2015.
Accepted on: 29 October 2015.
___________________International Journal of Automation and Control
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