이종민 황요하 2024-01-12T21:02:15Z 2024-01-12T21:02:15Z 2003-07-22 https://pubs.kist.re.kr/handle/201004/96504 내연기관의　배기소음　제어장치 Patent 2003-07-22 2001-06-12 6,595,320 09/878,399 US 특허 한국과학기술연구원