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이한춘,방광현,김무환 대한설비공학회 1998 설비공학 논문집 Vol.10 No.1
The thermal performance of cooling towers is affected mainly by the velocity, temperature and humidity of the entering air, In this paper, the effects of these variables are experimentally investigated for both counter-flow and cross-flow cooling towers. The cooling performance is reduced by up to 50% as the relative humidity of the entering air is increased from 40% to 80%. The higher air velocity and lower coolant flow show better cooling performance. The coolant loss rates in the present experimental conditions are in the range of 0.4 to 1.7%
카이로프락틱 골반 교정이 경추증후군의 신체균형에 미치는 영향
이한춘,오평일,홍승희,이태영,장부규,Lee, Han-Chun,Oh, Pyung-Il,Hong, Seung-Hui,Lee, Tae-Young,Jang, Bu-Kyeu 한국임상보건과학회 2013 한국임상보건과학회지 Vol.1 No.2
Purpose. This study was to investigate that the adjustment of Chiropractic pelvis method have effect on body balance and improvement people who has some problem in their daily life. Methods. With 20 students of experiment group and 20 students of compare group who has cervical syndrome, experiment group has adjustment of chiropractic pelvis 2 times a week for 4 weeks, the other group who didn't take any action. Results. As a result, center of body of experiment group wasn't improved relations between left and right statistically. But the relations between front and back of center of body increased statistically, cross analysis relations between short leg and center of body increased statistically. Conclusions. As a conclusion, experiment group with the front of center of body was improved 12.88% average of center of body. Experiment group with back of center of body was improved 13.84% average of center of body. This result come to the conclusion that chiropractic pelvis adjustment help the front and back of body balance.
FeN / Co / Cu / Co계 spin - valve형 다층막의 자기저항 특성
이한춘(Han-choon Lee),송민석(Min-seok Song),윤성호(Seong-ho Youn),김택기(Taik-kee Kim) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.5
The magnetoresistance characteristics of FeN/Co/Cu/Co and FeN/Co/Cu/Co/Cu/Co/FeN multilayers using ferromagnetic iron-nitrides (FeN) has been studied. The microstructure of FeN film is the mixed α-Fe and ε-Fe₃N phase on the condition that the flow rate of N₂ gas is over 0.4 sccm. The magnetoresistance effect is observed because of shape magnetic anisotropy induced by needle-shaped ε-Fe₃N phase. This magnetoresistance effect changes, because the degree that the shape magnetic anisotropy adheres to the adjacent Co pinned layer is varied according to the flow rate of N₂ gas and the thickness of FeN film. The best magnetoresistance effect is obtained on the condition that the thickness of Co free layer is 70 Å and the maximum MR ratio(%) value of 3.2 % shows in the FeN(250 Å)/Co(70 Å)/Cu(25 Å)/Co(70 Å)/Cu(25 Å)/ Co(70 Å)/ FeN(250 Å) mutilayer film which is fabricated at the N₂ gas flow rate of 0.5 sccm and the FeN film thickness of 250 Å. Four steps are observed in the magnetoresistance curve owing to this difference of coercive force, because respective magnetic layers in the multilayer possess different coercive forces. These effects observed in these mutilayer films can be expected to application to the memory device the same MRAM as can carry out simultaneously four signals.
일정 벽면 온도 조건에서 이성분 혼합물의 핵비등시 벽면 열유속 거동
배성원,이한춘,김무환,Bae, Sung-Won,Lee, Han-Choon,Kim, Moo-Hwan 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9
The objective of this work is to measure space and time resolved wall heat fluxes during nucleate pool boiling of R113/R11 mixtures using a microscale heater array in conjunction with a high speed CCD. The microscale heater array is constructed using VLSI techniques, and consists of 96 serpentine platinum resistance heaters on a transparent quartz substrate. Electronic feedback circuits are used to keep the temperature of each heater at a specified temperature and the variation in heating power required to keep the temperature constant is measured. Heat flux data around an isolated bubble are obtained with triggered CCD images. CCD images are obtained at a rate of 1000frames/second. The heat transfer variation vs. time on the heaters directly around the nucleation site is plotted and correlated with images of the bubble obtainedby using the high speed CCD. For both of the mixture(R11/R113) and pure system(pure R11, pure R113), the wall heat fluxes are presented and compared to find out the qualitative difference between pure and binary mixture nucleate boiling.
홍승희,오평일,이한춘,이미자,Hong, Seung-Hui,Oh, Pyung-Il,Lee, Han-Chun,Lee, Mi-Ja 한국전자통신학회 2013 한국전자통신학회 논문지 Vol.8 No.7
기치유가 자율신경계의 조절 능력에 미치는 영향을 알아보기 위하여 19명을 대상으로 '생활이완 시행'과 '기치유 시술' 전 후의 체감 변화와 심박변이도의 신체저항도, 평균심박수, 주파수 영역분석의 차이를 조사 및 측정하였다. 대상자들은 '생활이완 시행'과 '기치유 시술' 전 후의 체감 변화 설문에서 각각 약 8.5%와 약 23.3%의 스트레스 감소 변화율을 나타내어 '기치유 시술'이 스트레스 완화 및 감소에 긍정적인 영향을 미친 것으로 판단되었다. 심박 변이도의 신체저항도, 평균심박수, 주파수 영역 분석을 조사한 결과에서 '생활이완 시행'은 유의한 차이가 없었으나 '기치유 시술'에서는 6개 항목에서 유의한 차이를 나타내어 '기치유 시술'이 자율신경계의 조절 능력에 영향을 미쳐 스트레스 저항도를 향상시키고 스트레스 감소 및 완화에 조력할 수 있음이 입증되어 보완 대체 요법으로서 가치가 있다고 판단된다. This paper demonstrates that 'Qi Energy Healing' effects on elevation of capabilities in regards with the autonomic nervous system which prevents from the stress. Nineteen participants were assigned into 'Qi Energy Healing' and the 'Ordinary Relaxation' condition. Participants were examined to see the difference of frequency domain analysis, heart rate tachogram, physical resistance through the heart rate variability. The 'Qi Energy Healing' is significantly more likely to influence on reducing and diminishing the stress. 'Qi Energy Healing' treatment showed clear distinction on 6 fact. Our findings established the link between effectiveness of 'Qi Energy Healing' and the autonomic nervous system.