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최승주,이재현,이찬규,김근수,이종훈 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
Hot corrosion behavior of the CMSX-2, CMSX-4, Rene 77, Rene 80 Ni-base superalloys was investigated at 900℃ by two different corrosion methods, immersing the samples in Na2SO4-NaCl mixture(immersion test)and coating the salt mixture on the surface of the samples(modified coating test). The effects of corrosion times and salt compositions from 0 to 100 percent in Na2SO4-NaCl mixtures were examined. Experimental results showed that the corrosion depths in the alloys increased with increasing time, and the depths of the modified coating test were shotter than those of the immersion test in the mixed salt. It was found that the depths of CMSX series alloys increasing NaCl contents in the mixtures up to 50% NaCl. Corrosion products of the alloys were composed of Cr, Al, Ti oxides. The oxide scale, such as Cr₂O₃, Al₂O₃, TiO₂, were shown to improve hot corrosion resistance in the fused Na₂SO₄-NaCl mixtures.
최동훈,이중림,민승기,박종환,김해영,조재선 慶熙大學校 1998 論文集 Vol.27 No.-
Strain type of lactic acid bacteria was analysed by PCR and SDS-PAGE. PCR allows the rapid and specific detection of lactic acid bacteria using primers based on 16S rRNA gene-sequences. The analysis of protein pattern on SDS-PAGE can be used to determine the differences among the same or similar species of lactic acid bacteria. Therefore, the complementary use of PCR and SDS-PAGE method is one of simple way to classify the lactic acid bacteria and to compare with genetic analysis.
최시완,정진옥,강승식,성인환,박종훈 충남대학교 의과대학 지역사회의학연구소 1995 충남의대잡지 Vol.22 No.1
Background : Noninvasive attemps to identify left ventricular relaxation have been hampered because relaxation rate, left atrial filling pressure, and chamber compliance are the major determinants of peak early velocity and filling rate. This study was perfomed to evaluate the relation between the velocity of flow propagation and left ventricular relaxation by using pulsed doppler echocardiography to analize flow propagation in the left ventricle. Method : By using pulsed Doppler echocardiography, the velocity of left ventricular flow propagation was measured from the distance and time difference of flow wave along the long axis propagation of left ventricular inflow during early filling in normal subjects (n=30), and M-mode echocardiographic data were obtained to evaluate mitral annulus long axis movement (mitral annulus relaxation rate) which represents left ventricular relaxation. Results : the peak early velocity was not related to mitral annulus relaxation rate, but, the velocity of flow propagation was related to mitral annulus relaxarate (P<0.005) in normal subjects. Conclusion : the velocity of flow propagation during early filling seems to be highly dependent on the mitral annulus relaxation rate and could be an important noninvasive tool in studying diastolic function.
최관용,전승훈,정현택 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.3
The purpose of this study is to investigate how elite judokas have their own point of views for selecting their universities and is also to analyze coach's decision-making factors for selecting elite judokas, For the study, we give questionnaires to 176 judokas (male: 121; female 55) who were in promoted judo teams located in seoul and kyunggi-do. The results of this study were as followed: First, Decision-making factors for choosing universities by elite judokas include external factors such as recommendation in the others, the given benevolence of athletes, exercise or training facilities, university's faculty, recognition, location, and also include internal factors such as future courses, self-hopes, self-capacities, Second, Considering primary factors for selecting universities in judokas include recommendation from their own coaches and parents, and exercise or training facilities, university's recognition and future courses, colleagues, self-hopes. Third, for selecting universities by gender, there is no significantly difference between male and female judokas. Fourth, for selecting universities by grade. Fifth, according to district area, there is no significantly difference between seoul and kyunggi-do district.
디젤기관에서 매연과 NOx의 동시저감을 위한 모노에테르계 함산소연료와 EGR 방법의 조합에 관한 연구
최승훈,황윤택,김우상,오영택 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
In this paper, the effect of oxygen component in fuel on the exhaust emissions has been investigated for a direct injection diesel engine. It was tested to estimate change of engine performance and exhaust emission characteristics for the commercial diesel fuel and oxygenated blended fuel which has seven kinds of mixed ratio. And, the effects of exhaust gas recirculation(EGR) on the characteristics of NO_x emission have been investigated. Ethylene glycol mono-n-butyl ether(EGBE) contains oxygen component 27% in itself, and it is a kind of effective oxygenated fuel of mono-ether group that the smoke emission of EGBE is reduced remarkably compared with commercial diesel fuel, that is, it can supply oxygen component sufficiently at higher loads and speeds in a diesel engine. It was found that simultaneous reduction of smoke and NO_x was achieved with oxygenated fuel and cooled EGR method.
박헌휘,이춘수,최승우,함승주 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
저압 기상 영역에서 Anhydrous HF 가스와 Methanol vapor를 사용하는 산화막 식각공정을 수행하기 위하여 (1) 반응기 부피의 최소화, (2) 공정압력의 최소화, (3) 고순도 알루미나 Reactor 적용, (4) Cluster화의 개념을 적용한 VPC 장치를 제작하였다.Wafer의 온도, HF의 분압 및 Working Pressure 등의 공정변수에 따른 Oxide Wafer의 식각특성의 변화를 확인하였다 또한 Etch Uniformity를 향상시키기 위하여 Shower Head의 구조를 변경시켜서 실험하였으며, CFD Simulation을 이용하여 Reactor 내에서의 HF gas 및 Methanol vapor의 분율을 예측하였다.
백승희,오윤정,최영화,신승수,박광주,황성철,박주헌 대한감염학회 2006 감염과 화학요법 Vol.38 No.4
폐렴구균 균혈증에 합병된 심내막염은 드문 경우로 페니실린이 사용된 1940년대 이후로 전체의 1% 이하로 감소하였고, 주로 알코올 중독자에게 잘 발생한다. 저자들은 부비동염과 폐렴구균에 의한 균혈증으로 내원하여 항생제 치료 중 폐렴 및 대동맥 판막에 세균성 심내막염이 발생하여 대동막 판막 치환술 및 승모판 성형술 시행을경험하였기에 문헌 고찰과 함께 보고하는 바이다. Streptococcus pneumoniae has been a rare cause of endocarditis in the postantibiotic era. The incidence of pneumococcal endocarditis now accounts for less than 3% of all cases and most often occur in patients with risk factors, especially alcoholism. We report the case of a 68-year-old male with acute infective endocarditis due to Streptococcus pneumoniae. We stressed the low frequency of this agent as a cause of endocarditis and the atypical evolution of this case.