00591na  a2200181   4500001001300000005001500013008004100028024002700069100002600096370004800122372004000170372001700210373004800227374004600275374002600321377001400347670004800361KAC20151822720190611163518150904 b aznnnaabn           a aaa      7 a00000004789425752isni1 a홍원식,g洪元植  c한국(국명)[韓國]0KSH20000101452nlsh  a철도[鐵道]0KSH19980045772nlsh  a전차공학  a한국철도공사 철도교통관제센터  a기술자[技術者]0KSH19980102032nlsh  a철도신호기술사  l한국어  a철도신호공학, (동일출판사), 2015