000  $anz n  2
000  $a주제어
001  $aKSH1998001185
005  $a19980429124939
008  $a980429 n azknnaabn          |a a|a    | 
150  $aPSN
450  $wr$i영어$apacket switch node
550  $aX.25
550  $a패킷[packet]