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허정기 ( Heo Jeong Gi ),차성일 ( Cha Seong Il ),김준경 ( Kim Jun Gyeong ),장성규 ( Jang Seong Gyu ),문태식 ( Mun Tae Sig ),윤병철 ( Yun Byeong Cheol ),최환주 ( Choe Hwan Ju ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.12
Conjoined twins are rare congenital malformation that occurs one in 50,000-100,000 births. The site and fusion are variable. In recent years, prenatal diagnosis of conjoined twins with ultrasonogram (US), computed tomography (CT), and magnetic resonance i
최인열(In Yul Choi),이경화(Kyong Hwa Lee),허정기(Jung Ki Heo),문태식(Tae Sik Moon),윤병철(Byong Chul Yoon),최환주(Hwan Joo Choi) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.5
Ovarian Pregnacy is a rare form of ectopic pregnacy. Its estimated overall incidence is highly variable, but improved diagnosis of acute hemoperitoneum of ovarian pregnancy may reveal a high incidence than reported earlier. Ovarian pregnancy occurs in the corpus luteum, and is usually accompanied with the rupture of the ovary and massive hemoperitoneum. It presents as a hemorragic ovary and frequently misdiagnosed as a ruptured corpus luteum. Risk facters to ovarian pregnacy include a history of pelvic inflammatory disease(PID), prior pelvic surgery, and use of an intrauterine contraceptive device(IUD). We have experienced two cases of ovarian pregnancy and reviewed it briefly.
강체 운동 해석 및 실험을 통한 엔진 내부 진동 예측에 관한 연구
김병현(Kim, Byung-Hyun),박종호(Park, Jong-Ho),김의열(Kim, Eui-Yeol),이상권(Lee, Sang-Kwon),김태정(Kim, Tae-Jeong),허정기(Heo, Jeong-Ki) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.11
This paper presents practical results for the estimation of vibration level inside a powertrain based on the rigid body theory and measurement. The vibration level of inside powertrain has been used for the calculation of excitation force of an engine indirectly. However it was difficult to estimate or measure the vibration level inside of a powertrain when a powertrain works on the driving condition of a vehicle. To do this work, the rigid body theory is employed. At the first, the vibration on the surface of a powertrain is measured and its results are secondly used for the estimation the vibration level inside of powertrain together with rigid body theory. Also did research on how to decrease the error rate when the rigid body theory is applied. This method is successfully applied to the estimation of the vibration level on arbitrary point of powertrain on the driving condition at the road.