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Submitted on: 12 July 2000.
Revised on: 07 October 2000.
Accepted on: 29 November 2000.
___________________ELECTRICAL ENGINEERING IN JAPAN
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Submitted on: 01 February 2024.
Revised on: 28 March 2024.
Accepted on: 17 May 2024.
___________________ELECTRICAL ENGINEERING IN JAPAN