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홍천수,장길진,김응,김준명,전동운 대한감염학회 1993 감염 Vol.25 No.3
Clinical Observations were made on 46 cases of group A streptococcal bacteremia, admitted in Severance Hospital from January 1900 to June 1992. Following results were obtained. 1) In age and sex distribution, mean age was 31.7 years old and all age groups were affected. The male to female ratio was 1:1. There was seasonal variation in the prevalence with fewer cases occuring in the summer months(July-October). 2) There were 30 cases (65%) of significant bacteremia, 9 cases (20%) of transient bactermia and 7 cases(15%) of nosocomial bacteremia. And there were 35 cases(76%) of monomicrobial bacteremia and 11 cases(24%) of polymicrobial bacteremia. S. aureus was the most commonly concomitant pathogen in polymicrobial bacteremia. 3) In the clinical symtoms and signs, fever and chilling were most common. The gastrointestinal symptoms were frequently noted. There were 4 cases (9%) of cataneous symptoms. 4) All of our patients had concomitant underlying conditions : Malignant disease was most common (14 case-30%). There were 10 cases (21%) of chronic heart disease, 7 cases (15%) of chronic lung disease, 3 cases(7%) of diabetes melitus. 3 cases(7%) of liver cirrhosis, 3 cases (7%) of pregnancy, 2 cases (4%) of puerperium, and 1 case (2%) of steroid immunosuppressive therapy. And among 14 cases of malignant disease, 9 cases(64%) had solid tumors. 5) The lower respiratory tract was the commonest portal of entry (22 case-48%). There were 6 cases (13%) of hepatobiliary-gastrointestinal tract, 5 cases (11%) of female genital tract, 4 cases (9%) of skin and 1 case of infective endocarditis. We observed 7 cases (15%) of primary (cryptogenic) septicemias and the patients with primary septicemia had a lower mean age (22.2 years old) but no sexual predisposition and no difference in mortality rate. Most patients of primary septicemia had concomitant underlying deseases. 6) The mortality rate was 17%(8 cases) and septic shock/hypotension and confusion were associated with higher rates of mortality.
Low GWP 냉매를 적용한 단단 증기 압축식 사이클 성능 특성비교
전동순(Dong-Soon Jeon),고지운(Ji-Woon Ko),문지현(Ji-Hyun Mun),김영률(Young-Lyoul Kim) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
This paper presents the study on a single stage vapor compression cycle using low GWP refrigerants. Also, investigation for the alternative refrigerants was performed. Developed program was used to predict performance of single stage vapor compression cycle according to evaporating and condensing temperatures. This Program included refrigerants(R134a, R410A, R404A, R245fa, R1234yf, R1234ze(E), R1233zd(E), R32). The effects on COP(Coefficient Of Performance) and CR(Compression Ratio) of vapor compression cycle were analyzed according to evaporating and condensing temperature. As a result, it was found that R1233zd(E) refrigerant was a good alternative refrigerant at the evaporating temperature 7.2℃. And R1234yf refrigerant showed good performance when evaporating temperature was –28℃.
수평 평활관의 수직배열에 따른 R1233zd(E)의 막응축 열전달 특성
고지운(Ji-Woon Ko),전동순(Dong-Soon Jeon) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
In this study, experimental investigations on the film condensation heat transfer characteristics of R1233zd(E) was carried out. Also, experimental investigation has been conducted to examine the vertical aligned horizontal smooth Tube. The saturation temperature and the heat flux were 38 ~ 40℃ and 3.42 ~20.74 kW/m² respectively. As a result of performance test it is obtained that film condensation heat transfer coefficients is 1.357 ~ 3.460 kW/m²·K. And film condensation heat transfer coefficients decreases with an increase in row number.
고지운(Ji-Woon Ko),전동순(Dong-Soon Jeon) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
In this paper, an experimental study was conducted on the performance characteristics of a packed-bed type liquid dehumidifier. The object of this study is to find out the characteristics of the dehumidifier analytically according to the variations of relative humidity and velocity of the process air. The liquid desiccant used in the experiment are aqueous lithium chloride(LiCl) solution. As results, dehumidification rate increases with an increase in velocity and relative humidity of process air, but effectiveness of dehumidification decreases. The dehumidification rate was about 12.39 ~ 34.06 g/min and effectiveness of dehumidification was 18.75 ∼ 33.64%.