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극저온 환경의 10 kW급 마이크로채널 열교환기에 대한 단상 열전달특성에 대한 연구
임재현(Jae Hyun Im),오동욱(Dong Wook Oh),김영(Young Kim),최준석(Jun Seok Choi),윤석호(Seok Ho Yoon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Micro channel heat exchanger has superior performance compared with other existing commercial heat exchangers because of its large heat transfer area per unit volume. Micro channel heat exchanger has an advantage of compactness and high efficiency due to its high thermal performance. In this study, pilot-scale micro channel heat exchanger which has pilot-scale capacity was designed and fabricated. The thermal performance test was conducted with counter-flow condition. The nitrogen was used as a working fluid for both of hot and cold stream. The inlet temperature of nitrogen was controlled by vaporizers and heaters. The pressure drop and heat transfer coefficient with regard to various mass flow rates has been measured. The pressure drop and heat transfer rate has a tendency to increase according to mass flow rate increase.
재활승마가 뇌병변 장애아동들의 대동작 운동기능과 균형성에 미치는 효과
임재현(Im, Jae-Hyun),허정훈(Huh, Jung-Hoon) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.3
The purpose of this study was to investigate the effects of rehabilitation horse riding on the gross motor function and muscle balance of mentally disabled children. Six mentally disable children (boys and girls) were selected for this study. Each of the subjects participated in 12 sessions of rehabilitation horse riding over a period of 3 months. Before and after measurements were taken using the gross motor function evaluation, pediatric balance scale and observation techniques. The gross motor function evaluation score was higher after the training for the subject A lying down more and flipping over, for B standing on all fours and kneeling, for E and F sitting down, and for C and D standing. There was a slight difference in the improvement of muscle balance while the subjects were walking. From observation the training affected all of subjects’ psychological state. In conclusion, this study provides evidence that rehabilitation horse riding have positive effects on gross motor function skills of mentally disabled children.
임재현(Jae-hyun Im),김대희(Dae-hee Kim),최종호(Jong-ho Choi),백준기(Joon-ki Paik) 한국컴퓨터정보학회 2007 한국컴퓨터정보학회지 Vol.15 No.1
다시점에서의 다중 객체 추적은 여러 분야에서 연구되고 있다. 다시점 영상 추적은 두 객체가 서로 근접하면 하나로 인식하는 문제점을 가지고 있다. 이러한 문제를 해결하기 위한 하나의 방법으로 능동형태모델(active shape mode: ASM)을 들 수 있다. ASM은 훈련집합을 이용하여 다른 객체에 가려진 목표 객체를 추적할 수 있다. 본 논문에서는 겹쳐진 객체를 추적하기 위해 ASM 기반의 다시점 추적 알고리듬(Multi-view tracking using ASM: MVTA)에 대해서 제안한다. 제안된 추적 방법은 (ⅰ) 영상 획득, (ⅱ) 객체 추출, (ⅲ) 객체 추적, 그리고 (ⅳ) 현재 형태의 업데이트, 4가지 단계로 나눌 수 있다. 첫 번째 단계에서는 여러 대의 카메라를 사용해서 다시점 영상을 획득하며, 두 번째 단계에서는 객체를 배경으로부터 분리하며, 겹쳐진 객체로부터 목표 객체를 분리해낸다. 세 번째 단계에서는 추적을 위해 ASM을 사용하며, 마지막 단계인 네 번째 단계는 현재 입력 영상의 업데이트이다. 실험결과 제안한 MVTA는 겹쳐진 객체를 추적 시에 생기는 문제에 대해서 향상 된 결과를 보여준다.
자성발생성 2 배체 메기 Silurus asotus 의 생산
임재현(Jae Hyun Im),조효종(Hyo Jong Cho),남윤권(Yoon Kwon Nam),김동수(Dong Soo Kim),박인석(In Seok Park) 한국유전학회 2001 Genes & Genomics Vol.23 No.1
N/A Meiotic gynogenesis was optimized in the far eastern catfish, Silurus asotus, using both UV-irradiated heterospecific sperm and thermal shock treatment. Eggs were activated with the sperm of mud loach (Misgurnus mizolepis) which had been irradiated with UV at dose levels ranged from 1,020 to 15,000 ergs/mm2. By examining haploidy incidence and survival of the embryos, the optimal dose for genetic inactivation of the sperm was proven to be 7,020 ergs/mm2. Combination of the initial treatment timing (5 min post fertilization) and duration of cold shock (40 mins at 4℃) yielded 92.4% of matching success. Restoration of diploid states was verified using karyoloical analysis. The sex ratios of offsprings from control crosses and gynogenetic groups were different : control group showed no deviation from 1:1 ratio (P>0.05), while gynogenetic groups displayed all femaleness (P<0.05). This results indicates that genetic sex determination of far eastern catfish is based on the XX-XY system (female homogamety), and this advance also has implication on the production of genetically improved all-female far eastern catfish stock.