00936na  a2200241   4500001001300000005001500013008004100028024002700069035002700096035001800123100003400141370004800175372005300223372001700276373005600293374005700349375001100406377001400417400002900431670011000460670005400570670007000624KAC2018B363520221124110730180824 b aznnnaabn          fa aaa      7 a000000046835100X2isni  a(KISTI)ADPER0000172571  a(KRI)112014091 a송창헌,g宋昌憲,d1983-  c한국(국명)[韓國]0KSH20000101452nlsh  a기계 공학[機械工學]0KSH19980184142nlsh  a건설기계  a한국생산기술연구원 (선임연구원)s2018  a연구원(연구자)[硏究員]0KSH19980377142nlsh  a남성  l한국어1 aSong, Chang-Heon,d1983-  aOptimal Design Parameters of a Percussive Drilling System for Efficiency Improvement, (HINDAWI LTD), 2018  a한국연구자정보(KRI)uhttps://www.kri.go.kr  a한국과학기술정보연구원(KISTI)uhttps://www.kisti.re.kr