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주변장치를 포함한 상압형과 가압형 고분자전해질형 연료전지 시스템 성능 비교
이동훈(Donghun Lee),김한상(Hansang Kim),방정환(Junghwan Bang),민경덕(Kyoungdoug Min),김민수(Min Soo Kim),조영만(Yongman Cho) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Two different types of operating fuel cell systems (low-pressure and high-pressure operating fuel cell systems) consisting of proton exchange membrane fuel cell (PEMFC) stack and balance of plant (BOP), which is for vehicle application. was modeled by using MATLAB/Simulink. The effects of humidity and pressure of the supplied gas on the power distribution characteristics of BOP and net system efficiency for two different types of the fuel cell systems were compared. The results of this study demonstrate that the humidity condition of supplied gas strongly affects on the performance of low-pressure operating fuel cell system and there exist optimum cathode air pressure for maximizing fuel cell system efficiency on each system operating conditions. (Through this study, we did a basic fuel cell system optimization.) Along with multi-object variable optimization packages, the approach here presented can be effectively used for establishing an operating strategy of the practical fuel cell system for vehicle application.
이동훈(Donghun Lee),우종우(Chongwoo Woo) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
최근 인공지능의 기법을 도입한 게임에 관한 연구가 활발히 진행되고 있다. 특히 신경망의 역 전파 알고리즘을 적용한 게임은 구현이 용이하고 학습이 완료되면 비교적 실행이 빨라서 많은 연구가 진행되고 있지만, 기본적인 학습시간이 길고 최적화에 관한 문제점이 존재하고 있다. 이러한 문제점을 개선하고자 본 논문에서는 기존의 역 전파 알고리즘과 강화학습의 Q-learning알고리즘을 오델로 게임에 적용하여 비교 분석 하였다. 실험은 단순한 min-max 알고리즘과 각각 대결하여 승수 와 승율을 중심으로 비교하였고 실험의 결과는 강화학습의 알고리즘이 역 전파 알고리즘에 비하여 비교적 우수한 결과를 제시하였다.
주변 장치를 고려한 자동차용 고분자전해질형 연료전지 시스템 성능 시뮬레이션
이동훈(Donghun Lee),김한상(Hansang Kim),방정환(Junghwan Bang),민경덕(Kyoungdoug Min),김민수(Minsoo Kim),조영만(Youngman Cho) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The focus of this study is to investigate the effects of operating conditions (cathode air pressure and humidity) on the power distribution characteristics of balance of plant (BOP) and net total system efficiency of polymer electrolyte<br/> membrane fuel cell (PEMFC) system for automotive applications. To this end, the fuel cell system consisting of<br/> stack and BOP was modeled by using MATLAB/Simulink environment. Results indicate that there exist optimum values in cathode air pressure and humidity for maximizing the net total system efficiency with maximum net power. The basic concept on the component sizing of BOP and its complications can be understood through this work. Along with optimized techniques, the approaches here presented can be effectively used for establishing an operating strategy for practical fuel cell system with improved performance and efficiency.<br/>
사회적 배려계층의 일상생활활동 불편도 분석 및 유니버설 디자인 설계요소 도출
이동훈(Donghun Lee),김희진(Heejin Kim),김충식(Chungsik Kim),정민근(Min K. Chung) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.4
This study investigated perceived discomforts and those reasons of the young and middle-aged, the aged, the disabled and the pregnant in various daily activities, and elicited universal design factors based on human capacities (physical, sensory, cognitive and affective). A total of eighty people (twenty subjects for each user group) participated in one-to-one interviews about thirty six items of daily activities. A degree of discomfort of the daily activities was measured using Borg's CR10 scale. As a result, the disabled and the pregnant complained about almost all of the daily activities, and their degrees of discomforts were significantly higher than those of the youth and middle-aged and the aged. However, the youth and middle-aged and the aged only complained about some specific items. The major reasons of discomforts were related to physical and affective capabilities in general, where the detailed reasons of each user group were comparatively different. Finally, the universal design factors were elicited for each daily activity item based on the results of each user group. This study can be used to understand the discomforts and characteristics of the aged, the disabled and the pregnant in the various daily activities. The universal design factors elicited can also be applied to design related products and facilities universally.
이동훈(Donghun Lee),정민근(Min K. Chung),김정룡(Jung Young Kim) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.3
This study investigated perceived discomfort and reasons related to use three information technology products (personal computer, mobile phone and digital television remote controller), and extracted the universal design factors. 240 people (30 females and 30 males for four age groups) participated in the one-to-one interview type of questionnaire, and replied to degree of discomfort at level of items and the reasons of discomfort at level of detailed elements for each product. As a result, almost all age groups answered that using input buttons of mobile phone and remote controller and watching display of mobile phone caused discomfort. Binary logistic regression of the detailed elements showed that response rate of discomfort mostly increased with age, except for specific elements such as shape of mouse and remote controller, and location of function button of mobile phone. Some of the detailed elements had high response rate of discomfort from all age groups. The age groups also showed similar tendency for the elements to select one alternative for the reason of discomfort, but not for sound volume and size of mobile phone and button sensitivity of remote controller. Finally, the universal design factors were extracted for each product based on the results, and divided into common factors and factors classified by the age group. Through this study, we identified using practices of various age groups and their demands for the products. It is expected that extracted detailed elements can be considered as important design factors to design the products universally.