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Submitted on: 06 January 2000.
Revised on: 10 February 2000.
Accepted on: 09 March 2000.
___________________IEEE INDUSTRY APPLICATIONS MAGAZINE
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http://reply.papertrans.cn/2/118/11784/11784-34.png
Submitted on: 19 September 2014.
Revised on: 10 January 2015.
Accepted on: 27 February 2015.
___________________IEEE INDUSTRY APPLICATIONS MAGAZINE
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