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나노유체를 적용한 태양열집열시스템 열전달 성능향상 연구
손지훈(J. H. Son),정정열(J. Y. Jung),이호생(H. S. Lee),김현주(H. J. Kim) 한국해양환경·에너지학회 2013 한국해양환경·에너지학회 학술대회논문집 Vol.2013 No.11
해양온도차발전의 경우 적도 및 아열대 해역에서는 1년 내내 효율이 유지가 되지만, 고위도에서는 하절기와 달리 동절기에는 표층수의 온도가 떨어져 심층수와의 적정온도차를 만족하지 못해 효율이 하락하는 등의 문제점이 발생함으로 인해 동절기에 해양온도차발전 운전시 해양표층수를 대체할 온열원의 공급이 필요하다. 동절기에 해양온도차발전의 온열원 확보를 위해 같은 전력으로도 좀 더 높은 온도의 온열원 공급을 위해 산화알루미늄 나노유체를 태양열집열시스템에 적용하였다. 이에 본 연구에서는 평판형 태양열집열기를 기반으로 하는 태양열집열시스템의 큰 관을 적용하여 실험장치 2개 set를 제작하였고, 실제 태양열의 평균일사량 대비 평판형 태양열집열기의 평균 집열열량을 기준으로 가동을 하여 순수물과 산화알루미늄 나노유체의 비율별 가동실험을 수행하여 열전달 성능을 비교하였다. In case of OTEC, its efficiency is maintained all through the year in tropical and subtropical regions. However in high latitude region, the efficiency of OTEC decreases due to less temperature difference between surface and deep waters in winter while the temperature difference is enough for OTEC in summer. Because the temperature of surface water goes down in winter, an additional heat source is necessary to compensate the energy of surface water to operate OTEC. In this study, solar energy is considered as the additional heat source because it is the most abundant energy resource on earth. Also nanofluid, a colloid with suspended nanoparticles, is used to enhance the heat transfer rate of solar collecting system. Al2O3/water nanofluids were prepared to used as an working fluid for solar collecting system. We installed same two sets of solar collecting system with flat-plate solar collectors and carried out experiments to compare heat transfer performances of pure water and Al2O3/water nanofluids.
적층형 4-BAR 메커니즘을 이용한 평면형 메니퓰레이터
이호열(Hoyul Lee),최영진(Youngjin Choi) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.5
This paper proposes a new planar robotic manipulator using stackable 4-BAR mechanisms for various applications. The proposed manipulator has an advantage that we can separate the driving actuators from a robotic manipulator. By separating actuators from the manipulator, we are able to separate the electrical component such as electrical wiring from the mechanical linkage/joint components in the robotic manipulator. Also, we suggest the kinematic analysis of the proposed manipulator which is composed of input mechanisms, multiple 4-BAR mechanisms and output mechanisms. Finally, we suggest numerical simulations to show the effectiveness of the proposed manipulator.
이호열(Hoyeol Lee),정영균(YoungKyun Jung),정진택(Jintaek Jung),박상훈(Sanghoon Park),오병수(Byeongsoo Oh) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
In order to solve the air pollution caused by internal combustion engine and the energy exhaustion problem. There are many researching to overcome this problem. Fuel cell is a device to convert the chemical energy of fuel into electric energy. Hence. Fuel cell can obtain higher efficiencies than combustion engine. The low emission of pollutants and high electric conversion efficiency make this one of the most promising candidates for a very wide range of energy sources, to electric vehicles. In this paper hybrid system which is consist of PEM fuel cell and battery was tested. When this system need drive torque. battery did that work, and PEM fuel cell power was used to drive the car with constant speed.<br/> <br/>
디젤엔진 질소산화물 저감을 위한 Solid SCR의 반응률에 관한 연구
이호열(Hoyeol Lee),윤천석(Cheon Seog Yoon),김홍석(Hongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Liquid urea based SCR has been used in the market to reduce NOx in the diesel exhaust emission of the vehicle. This system has several problems at low temperature, which are freezing below ?12 ℃, solid deposit formation in the exhaust, and difficulties in dosing system at exhaust temperature below 200 ℃. Also, it is required complicated exhaust packaging equipment and mixer due to supply uniform ammonia concentration. In order to solve these issue, solid urea, ammonium carbonate, and ammonium carbamate are selected as ammonia sources for the application of solid SCR. In this paper, basic research on reaction rate of three ammonia-transporting materials was performed. TGA(Thermogravimetric Analysis) and DTA(Differential Thermal Analysis) tests for these materials are carried out for various heating conditions. From the results, chemical kinetic parameters such as activation energy and frequency factor are obtained from the Arrhenius plot. Additionally, from test results of DSC(Differential Scanning Calorimeter) for these materials, chemical kinetic parameters using the Kissinger method are calculated. Activation energies of solid SCR from this experiment are compared with proper data of literature study, then obtained data of this experiment are used for the design of reactor and dosing system for candidate vehicle.
태권도 지도자의 거래적·변혁적 리더십이 자아존중감과 성취목표지향성에 미치는 영향
이호열(Lee, Ho-Youl),남행웅(Nam, Haeng-Woong),김만근(Kim, Man-Keun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.5
The purpose of this study was to analyze transaction and transformational leadership of Taekwondo Instructors on self-esteem and achievement goal orientation. For the purpose, questionnaires were distributed to and collected from 422 high school Taekwondo players in South Korea and their answers were analyzed by using such statistical test methods as correlation and multiple regression analysis. The following conclusions have been drawn from the analyses. First, it is found that the qualities of Taekwondo instructors had positive effects on personal self-esteem of Taekwondo players in the order of individual consideration, charisma, and exceptional management; and individual consideration leadership had a positive effect on physical ability. Furthermore, exceptional management and individual consideration leadership had a positive effect on the intellectual ability factors of self-esteem; and individual consideration leadership had a positive effect on friendship while conditional reward leadership had a negative effect on friendship. Second, individual consideration and charisma leadership of Taekwondo instructors had positive effects on task orientation of Taekwondo players, and exceptional management had a negative effect on task orientation. Task orientation was relatively more affected by exceptional management, by individual consideration and then charisma leadership. However, transactional and transformational leadership did not affect ego orientation.
이호열 ( Ho Yeol Lee ),김홍석 ( Hong Suk Kim ),우세종 ( Se Jong Woo ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
Urea injection nozzles affect the performance of NOx conversion in urea SCR systems because of their different spray characteristics.This study shows the spray characteristics of an air assisted internal mixing nozzle.The effects of pressure of compressed air and orifice diameter of nozzle on thermal decomposition to ammonia were investigated. In addition, the effect of static mixer on urea decomposition was studied.
이호열(Lee Ho-Youl),오경희(Oh Kyoung-Hee),이병관(Lee Byung Kwan) 한국체육과학회 2009 한국체육과학회지 Vol.18 No.2
This research is aimed at analyzing the primary reason why girl archers begin archery at first, researching their lifestyle since they are involved in, and finding out closely their attitude toward the process that they’re making their own unique culture through players’ lives. To meet the goal of this research, 7 girl’s players were invited, and the information materials collected by close-interview and book reference were used to prove the fact in an inductive way. In the process of collecting and analyzing the materials the research’s credibility, propriety, and morals was measured carefully. The followings are some summaries of analyzing the research, and of the result found out. First, Addicted to Archery. That is because they feel like in a fantasy world when allows are in the middle of the target being aimed at. The players fight with themselves and are deeply indulged in this sports. They find Archery is one of the gentle sports which can be gained as great as they make an effort. Second, the players, therefore, act differently to have relationship with specific other groups to adjust themselves into low class culture through the changing process. Because every player has to pay their whole attention on every single allow which they are pulling out, they get severe stress and even out of the competition. The answer to solving those psychological stressors can be achieved only by themselves. So, there is no training involved in. Third, Players in universities decide to concentrateon studying like other students rather than continuing as a professional athletic player does. But they still have a passion for archery. So they say they will play archery continuously as their hobby, not to be one of the professional elite players.