Korea Institute of Science and Technology Information (KISTI) 245 Daehak-ro Yuseong-gu Daejeon (305-806) South Korea;
Korea Institute of Science and Technology Information (KISTI) 245 Daehak-ro Yuseong-gu Daejeon (305-806) South Korea Korean University of Science and Technology (UST) 217 Gajung-ro Yuseong-gu Daejeon (305-350) South Korea;
core technology; technology ontology; elementary technology; scientific document;