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Submitted on: 22 May 2011.
Revised on: 30 August 2011.
Accepted on: 17 September 2011.
___________________JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Submitted on: 23 June 1999.
Revised on: 24 August 1999.
Accepted on: 24 September 1999.
___________________JOURNAL OF THE KOREAN PHYSICAL SOCIETY
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Submitted on: 19 January 2016.
Revised on: 07 April 2016.
Accepted on: 30 April 2016.
___________________JOURNAL OF THE KOREAN PHYSICAL SOCIETY