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LiBr계 용액을 사용한 수직관 흡수기의 열 및 물질 전달에 관한 연구
조현철,김종보,정시영,강상우,이춘식,Cho, H.C.,Kim, C.B.,Jeong, S.Y.,Kang, S.W.,Lee, C.S. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.2
Experimental investigations on heat and mass transfer characteristics in a vertical tube absorber have been carried out. Three different copper tubes with a length of 1.5m have been tested using LiBr solution and LiBr-$CaCl_2$ solution. The effects of solution flow rate, cooling water temperature, solution inlet temperature and evaporation temperature have been investigated in detail. It is found that heat transfer coefficient increases gradually with the increase of solution flow rate, but decreases rapidly for the flow rates less than 0.02kg/ms. The grooved tube generally shows better heat transfer performances than the smooth tube. LiBr solution shows almost no absorption capability for the cooling water temperatures over $40^{\circ}C$. LiBr-$CaCl_2$ gives less decreasing rate in absorption capability at these temperatures and the heat transfer coefficient becomes less dependent on the types of tubes in use. Considering heat and mass transfer rates, LiBr-$CaCl_2$ solution is found to be more suitable than LiBr solution for air cooled absorber, which operates at higher temperature than water cooled absorber.
근사 함수를 이용한 Point-Based Simplification
조현철(H. C. Cho),배진석(J. S. Bae),김창헌(C. H. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This paper proposes a new simplification algorithm that simplifies reconstructed polygonal mesh from 3D point set considering an original point set. Previous method computes error using mesh information, but it makes to increase error of difference between an original and a simplified model by reason of implementation of simplification. Proposed method simplifies a reconstructed model using an original point data, we acquire a simplified model similar an original. We show several simplified results to demonstrate the usability of our methods.
12주간 복합운동이 비만 청소년의 체지방 관련 사이토카인에 미치는 영향
김종식 ( J. S. Kim ),조현철 ( H. C. Cho ),강희성 ( H. S. Kang ) 한국운동생리학회(구 한국운동과학회) 2011 운동과학 Vol.20 No.3
김종식, 조현철, 강희성. 12주간 복합운동이 비만 청소년의 체지방 관련 사이토카인에 미치는 영향. 운동과학, 제20권 제3호. 329-338, 2011. 본 연구에서는 12주간의 복합운동 프로그램이 비만 청소년의 체지방 세포와 관련이 있는 leptin, adiponectin, IL-6에 미치는 효과를 규명하고자 하였다. 유산소 걷기운동은 주 4∼5회, 1∼5주까지는 45∼60% HRmax, 6∼12주까지는 61∼70% HRmax의 운동강도로 주기별 점증적으로 증가시켰으며, 저항 운동으로는 웨이트 트레이닝을 최대근력(1RM)의 60∼70%로 반복횟수 10∼12회, 3세트로 20분간 실시하였다. 복합운동집단과 걷기운동집단 모두 체중, 체지방률, BMI에서 유의한 변화를 나타내고 있으나 감소폭은 복합운동집단이 더욱 큰 것으로 나타났다. Leptin의 변화에서는 복합운동집단은 유의하게 감소하였으며(p<.01), 걷기운동집단도 유의한 감소가 나타났다(p<.01). Adiponectin 변화에서는 걷기운동집단은 유의하게 증가하였고(p<.01), 복합운동집단은 걷기운동집단보다 더욱 큰 증가폭을 나타내며 유의하게 증가하였다(p<.01). IL-6의 변화에서는 복합운동집단의 경우 통계적으로 유의하지 않지만 긍정적인 감소의 변화가 나타났으나 반대로 걷기운동집단의 경우는 증가하였다. 이상에서 살펴본 바와 같이, 복합운동 프로그램이 체지방 관련 사이토카인 leptin, adiponectin, IL-6에 긍정적인 변화를 가져왔으며, 특히 leptin과 adiponectin은 운동 전보다 12주 후에 매우 유의하게 변화하는 양상을 보였다. 즉 규칙적인 복합운동 프로그램은 비만 청소년의 비만치료 및 건강개선에 기여할 것으로 생각된다. The purpose of this study was to investigate the effects of twelve weeks combined exercise on body composition and adipocyte in obese adolescents. The walking exercise group performed walking program on a treadmill, 4∼5 times a week (1∼5 week; at the intensity of 45∼60% HRmax, 6∼12 week; at the intensity of 61∼70% HRmax), the resistance exercise group performed weight training in 20 min (intensity; 1RM 60∼70%, repetition; 10∼12 rpt. per set, 3 sets). The body compositions such as body weight, body fat mass and body mass index (BMI) in both the combined exercise group and the walking exercise group were significantly changed in positive, but the drop rate of the combined exercise group was larger than the walking group. The changes of leptin in the combined exercise group was decreased after 12 weeks of exercise (p<.01), the walking exercise group also was decreased (p<.01). The changes of adiponectin in the combined exercise group was increased after twelve weeks of exercise (p<.01), the walking exercise group also was increased (p<.01). But, there was no special change in the control group. The changes of IL-6 in the combined exercise group was decreased after 12 weeks of exercise, the walking exercise group was increased. These results suggest that positive changes can be found in body composition (body weight, body fat mass, BMI) and adipocyte (leptin, adiponectin, IL-6). There were significant changes in leptin, adiponectin after the 12-week exercise compared to that of the beginning. Consequently, regular combined exercise program had a positive effect on body composition and adipocyte throughout the increase of BMR, muscle mass, lipolysis, and the utilization of fat. The combined exercise program will be make a great benefit on health improvement and the treatment of obesity.