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김도영(Do-Young Kim),함정호(Jung-Ho Ham),김내현(Nae-Hyun Kim),박래현(Rae-Hyun Park),황준현(Jun-Hyun Hwang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The effect of inclination angle on the heat transfer and pressure drop characteristics of brazed aluminum heat exchangers is experimentally investigated. Three samples having different fin pitches (1.25, 1.5 and 2.0㎜) were tested. Results show that heat transfer coefficient is not affected by the inclination angle. However, the friction factor increases as the inclination angle increases with negligible difference between the forward and backward inclination. Both the heat transfer coefficient and the friction factor are the smallest at P<SUB>f</SUB>=1.5㎜, followed by P<SUB>r</SUB>=2.0㎜ and 1.25㎜. Possible explanation is provided considering the louver layout Comparison with existing correlations is also made.
김내현(Nae-Hyun Kim),함정호(Jung-Ho Ham),오왕규(Wang-Ku Oh),최용화(Yong-Hwa Choi),하야세(Hayase Gaku) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this study, pressure drop and heat transfer characteristics of plain finned heat exchangers having 5.0 diameter (fin collar 5.3 ㎜) tubes were investigated. Six samples having different fin pitches and tube rows were tested. The fin pitch had a negligible effect on j and f factors. Both j and f factors decreased as the number of tube row increased, although the difference was not significant for the f factor. When compared with the previous 7.3 ㎜ diameter data, both the present j and f factors yielded lower values. However, the j/f ratio was larger at low Reynolds numbers. Possible reasoning is provided from the flow pattern consideration. Comparison with existing correlations were made.
유입 방향에 따른 알루미늄 평행류 열교환기 헤더내 공기-물 2 상류 분지 실험
김내현(Nae-Hyun Kim),함정호(Jung-Ho Ham),박태균(Tae-Kyun Park),김도영(Do-Young Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The air and water flow distribution are experimentally studied for a round header ? ten microchannel tube configuration. Three different inlet orientations (parallel, side, normal) were investigated. Tests were conducted with downward flow configuration for the mass flux from 70 to 130 ㎏/㎡s, quality from 0.2 to 0.6, non-dimensional protrusion depth (h/D) from 0.0 to 0.5. It is shown that, for almost all the test conditions, normal inlet yielded the best flow distribution, followed by side and parallel inlet. Possible reasoning is provided using flow visualization results.
급성 식도 정맥류 출혈시 내시경적 결찰술과 Octreotide 및 Terlipressin 병용요법의 치료효과와 부작용 비교
김세형 ( Se Hyung Kim ),함정호 ( Jung Ho Ham ),박진우 ( Jin Woo Park ),이석호 ( Suck Ho Lee ),김홍주 ( Hong Joo Kim ),김현준 ( Hyun Jun Kim ),정일권 ( Il Kwun Chung ),김홍수 ( Hong Soo Kim ),박상흠 ( Sang Heum Park ),김선주 ( Sun 대한내과학회 2005 대한내과학회지 Vol.68 No.2
Background : In patients with liver cirrhosis, acute esophageal variceal bleeding is a life-threatening event with high mortality and subsequent recurrent bleeding despite of endoscopic therapy. So the effect of vasoactive agents used in combination with
간경변증 환자에서 식도정맥류 출혈의 계절적 변화의 관련 요인 분석
이선해 ( Sun Hae Lee ),김선주 ( Sun Joo Kim ),정승원 ( Seung Won Jung ),김지욱 ( Ji Wook Kim ),김환열 ( Hwan Yeol Kim ),김영훈 ( Young Hoon Kim ),이보영 ( Bo Young Lee ),함정호 ( Jeung Ho Ham ),김인호 ( In Ho Kim ),정일권 ( Il ksu 대한소화기학회 2002 대한소화기학회지 Vol.40 No.6
Background/Aims: The circadian variation of portal blood pressure and diurnal incidence of esophageal variceal bleeding (EVB) is well known, but the seasonal variation of EVB is still controversal. This study was performed retrospectively to evaluate the seasonal variation of EVB in patients with liver cirrhosis. Methods: Three hundred and seventy-five liver cirrhotic patients with EVB were enrolled. We evaluated the seasonal variation of EVB and correlations between bleeding and other clinical factors including recent alcohol intake. Results: The incidence of EVB was highest in April (50% higher than the monthly average), followed by March and lowest in July and August (45.8% lower than the monthly average), which did not reach statistical significance. The pattern of seasonal variation in patients with a history of recent alcohol intake was similar to that in the overall patient population, whereas the incidence of EVB was highest in December and lowest in August in patients without a history of recent alcohol intake. This may indicate that a history of recent alcohol intake is an important factor for EVB. Other factors such as age and Child-Pugh classification did not correlate with the seasonal variation of EVB. Conclusions: There seems to be a seasonal variation of EVB in patients with liver cirrhosis and alcohol intake may affect this seasonal variation. This result could be explained by the fact that the spring is a busy farming season and suitable for drinking in a rural district. (Korean J Gastroenterol 2002;40:386-393)