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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.
대학생의 MBTI성격 유행에 따른 정서적 경험에 미치는 실태연구
이금비,이태영,이한춘,Lee, Kum-Bee,Lee, Tae-Young,Lee, Han-Chun 한국임상보건과학회 2014 한국임상보건과학회지 Vol.2 No.3
Purpose. The aim of this study was to provide for guidance of life, counsel and check their mental condition and analysis of correlation between MBTI personality type and emotional experience in university students. Methods. Data was analyzed by students whom participated in the research on the diagnose of mind of students from m university men and woman who accomplished to MBTI personality survey. Results. These result emotional experience of male-female that had deserved hospitality(p=0.22) statistically. This result had deserved emotional experience of extraversion personality of MBTI personality type in hospitality(p=0.000),introvert personality type in interpersonal sensitivity(p=0.002). It had deserved thinking extraversion personality type in obsessive-compulsive(p=0.000)emotional personality type in depression(p=0.000)in hostility(p=0.000). It had deserved judgement personality type in interpersonal sensitivity(p=0.043). Conclusions. The results of this study were as follow. Frist as a result of MBTI personality type of emotional experience on extraversion it was found that hospitality was leveled high and personality type of introversion is that Interpersonal sensitivity was leveled high. Thinkful personality type was leveled high on obsessive-compulsive. As a result of this study, personality indexes of MBTI of university student, it was found that there was related to emotional experience.