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사이클론 선회류 약화기 구조에 따른 미세먼지 집진효율 연구
정동균(Dong Gyun Jeong),김범석(Beom Seok Kim),홍민선(Min Sun Hong) 大韓環境工學會 2017 대한환경공학회지 Vol.39 No.6
선회류 약화기(vortex finder)의 구조와 치수를 변형한 7종류의 cyclone을 제작해 PM-10 집진효율 자료를 도출하였고 CFD 분석을 통한 사이클론 입구 속도를 계산하였다. 입구속도는 normal, P, A type 사이클론의 경우 15.48 m/sec, 16.03 m/sec 그리고 15.90 m/sec로 계산되었고 PM-10 집진효율 실험결과는 P tpye과 A type의 사이클론의 경우 normal 사이클론에 비해 4%와 7%의 집진효율이 증가하였다. 또한 평행부의 길이가 증가함에 따라 PM-10의 집진효율은 증가하다 감소하여 집진효율을 최대화 할 수 있는 길이가 존재함을 보여주었다. The effect of vortex finder confiqurations on the PM-10 collection efficiencies has been investigated using 7 different types of cyclones. Cyclone inlet velocities were calculated by computational fluid dynamics analysis and PM-10 collection efficiencies were measured from experimental apparatus. The inlet velocities of normal, P and A type cyclones were calculated 15.48 m/sec, 16.03 m/sec and 15.9 m/sec, respectively while experimental results show that PM-10 collection efficiencies were increased 4% for P type and 7% for A type cyclones compared to normal cyclone. Also it was found that there exist optimum parallel head lengths for both P and A type cyclones to maximize the PM-10 collection efficiencies.
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김성근(Sung Keun Kim),이종영(Jong Young Lee),정덕자(Duk Ja Jeong),정동균(Dong Gyun Jeong),최조영(Cho Young Choi),최일균(Il Gyun Choi),이상용(Sang Young Lee) 대한내과학회 1990 대한내과학회지 Vol.39 No.3
N/A In has been recently suggested that left ventricular hypertrophy (LVH) in patients with hypertension is a very useful predictor of increased cardiovascular morbidity and mortality. So the therapeutic goals of antihypertensive therapy in hypertensive patients with LVH are in the reduction of LVH. In these days angiotensin converting enzyme (ACE) inhibitor has been chosen as a first line drugs of anti-hypertensive therapy. In order to evaluate the efficacy of antihypertensive drugs in reduction of LVH (as a result of administrated captopril and / or diuretics or prazosin and / or diuretics treatment), we examined 75 cases who had antihypertensive drugs with follow-up periods of over 6 months. They were groups into two, group 1 and 11, The group 1 (37 cases: 14 males, 21 females, mean 57.0±8.7 years) had been administrated prazosin and / or diuretics and group II (38 cases: 17 males, 23 females, mean 54.8±10.5 years) had been administrated captopril and/or diuretics. We observed the effect of BP control, reduction in cardiothoracic ratio with chest roentgenogram, symptoms and laboratory abnormalities between pretreatment and 6 months after treatment in two groups. And echocardiographic measurements were observed between pretreatment and after treatment in 13 cases of group II. The results were as followings: 1) Age, sex, duration of hypertension and class of hypertension were not different significantly in two groups. 2) The blood pressure was reduced significantly from 2 weeks after treatment in two groups. But the difference of BP reduction in two groups was not stastically significant. 3) The cardiothoracic ratio in chest roentgenogram was reduced after 6 months therapy than pretreatment in two groups and the difference of cardiothoracic ratio reduction was significant in group II than the group 1. 4) Severity of symptoms were reduced after treatment than pretreatment in both groups but the difference of reduction degree was not significant in two groups. 5) The abnormal laboratory findings were reduced after treatment than pretreatment. But no significance was found in the laboratory parameters except cardiothoracic ratio. 6) Interventricular septal wall thickness, posterior wall thickness and left ventricular mass were measured by echocardiogram. They were more reduced significantly after 6 months treatment than pretreatment in 13 cases of group II.
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