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Submitted on: 27 February 2000.
Revised on: 31 March 2000.
Accepted on: 07 May 2000.
___________________ELECTRICAL ENGINEERING IN JAPAN
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Submitted on: 02 April 2012.
Revised on: 15 June 2012.
Accepted on: 13 August 2012.
___________________ELECTRICAL ENGINEERING IN JAPAN
Submitted on: 19 April 2014.
Revised on: 10 May 2014.
Accepted on: 30 June 2014.
___________________ELECTRICAL ENGINEERING IN JAPAN