김경용 윤상옥 Inaguma Itoh Nakamura 2024-01-12T18:33:49Z 2024-01-12T18:33:49Z 1997-12-31 https://pubs.kist.re.kr/handle/201004/93824 고주파용　유전체　재료 Patent 1997-12-31 1994-07-27 134554 94-18289 KO 특허 한국과학기술연구원