Submitted on: 08 November 2012.
Revised on: 16 February 2013.
Accepted on: 07 March 2013.
___________________JOURNAL OF THE KOREAN PHYSICAL SOCIETY
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Submitted on: 14 July 2004.
Revised on: 24 September 2004.
Accepted on: 07 November 2004.
___________________JOURNAL OF THE KOREAN PHYSICAL SOCIETY