Affiliation: | Sang Chul Kim,Hwankyung Sung,Hong Soo Park and Eon-Chang SungKorea Astronomy Observatory,Taejon 305-348,Republic of Korea, sckim@kao.re.krDepartment of Astronomy and Space Science,Sejong University,98 Gunja-dong,Gwangjin-gu,Seoul 143-747,Republic of KoreaAstronomy Program,SEES,Seoul National University,Seoul 151-742,Republic of Korea |