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응답표면법에 의한 알루미늄합금의 가공면 거칠기에 관한 연구
구자성 ( Ja-sung Gu ),김원일 ( Won-il Kim ),이윤경 ( Yun-kyung Lee ),왕덕현 ( Duk-hyun Wang ),박지호 ( Ji-ho Park ) 한국산업융합학회 2005 한국산업융합학회 논문집 Vol.8 No.1
The purpose of this experimental study is to gain equations for the prediction of surface roughness depending on the three major parameters(the cutting speed, the feed rate and the nose radius). It is the merit of Response Surface Methodology that the test time is reduced to minimum size and accurate analysis can be done. On this study, first, made specimen, A1 5052 BE material which is widely used in school and cut the specimen with coated tungsten carbide tools, by varying the cutting conditions, such as the cutting speed, the feed rate and the nose radius. In conclusion, the surface roughness was most greatly influenced by the feed rate. And Surface Roughness equation gained by experiment is as followed R=58.2 υ<sup>-0.22</sup> f<sup>1.7</sup> r<sup>-0.66</sup>
Sigma-Delta 변조기법을 이용한 Boost Converter의 전도 노이즈 저감
이성희(Sung-Hee Lee),최태영(Tae-Young Choi),구자성(Ja-sung Gu),원충연(Chung-Yuen Won),김규식(Gyu-Sik Kim),최세완(Se-Wan Choi) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Conducted electromagnetic interference (EMI) from switch mode power supplies (SMPS) has become a major problem due to the proliferation<br/> of these devices employing dc-dc converters using standard pulse width modulation (PWM),<br/> In this paper, we proposed the sigma-delta mo(∑△M) as an alternative switching technique to reduce the conducted EMI In SMPS,<br/> A comparative Investigation on conducted EMI<br/> generated by PWM and ∑△M techniques are experimentally performed on a 300W Boost converter,
선택적 자궁 동맥 색전술 시행과 Methotrexate로 보존적 치료를 시행한 유착태반
조시현 ( Jo Si Hyeon ),배상욱 ( Bae Sang Ug ),권자영 ( Kwon Ja Yeong ),구자성 ( Gu Ja Seong ),김세광 ( Kim Se Gwang ),박기현 ( Park Gi Hyeon ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.4
Placenta accreta is a rare but potentially lethal obstetric emergency due to massive hemorrhage, uterine perforation, and infection. Traditionally, hysterectomy was performed in the occurrence of serious hemorrhage. Currently, several conservative treatme