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송명호(MyeongHo Song),김수동(SooDong Kim) Korean Institute of Information Scientists and Eng 2020 정보과학회논문지 Vol.47 No.4
Autonomous computing is one of the essential factors for realizing the fourth industrial revolution and a future technology that provides capabilities of autonomous recognition, autonomous judgement, autonomous planning, and autonomous management with automatic systems. With the advent of various sensors and IoT devices, a rich set of context data can be acquired from the environment, and autonomous system technologies with human-machine interface (HMI) enabling the realization of an eco-system wherein a system itself can maintain its best quality by using the acquired context data. However, because of the highly complicated functional and non-functional requirements for realizing autonomous systems, developing such systems becomes more difficult and development productivity becomes much lower. In the paper, we present a reference architecture which can be commonly applied to autonomous systems. The proposed reference architecture includes architecture design, core components, main algorithm, and so on. The reference architecture forms a structural basis of the target system and can guarantee the overall quality and improve development efficiency by reusing the core structure of the reference architecture. Additionally, we apply the reference architecture to two autonomous systems and verify the applicability and practicability of the reference architecture.
송명호(Myeongho Song),김경연(Kyoungyoun Kim),손영준(Young-Jun Sohn),양태현(Tae-Hyun Yang) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
연료전지 시스템 내의 스택의 냉각은 연료전지 성능에 많은 영향을 미친다. 스택 냉각이 원활히 이루어 지지 않으면, 스택내부의 온도분포의 불균형이 생기거나 과열로 인한 부품 손상 및 성능저하 문제가 발생한다. 본 연구에서는 고고도 무인기 연료전지 시스템 내의 스택 적정 온도를 얻기 위한 송풍기의 조건을 알아보기 위해 전산해석을 수행하였다. 속도의 크기, 냉각채널 단면 종횡비와 분리판의 종횡비에 따른 냉각 효과를 조사하였다. 냉각 채널의 유동 진행 방향을 줄이는 분리판 형상을 채택하고 냉각 채널의 단면 형상비를 증가시키면 냉각효과가 증가함을 확인하였다. Proper cooling of PEM fuel cell stack is essential for high performance operation of fuel cell system. Insufficient cooling of the stack can cause significant damage of components due to overheating and also can decrease cell performance by dehydration of the polymer electrolyte. In the present study, we performed a computational analysis to assess the condition of the cooling system to secure the proper temperature in fuel cell stack system for high altitude long endurance (HALE) unmanned aerial vehicle (UAV). Effects of flow velocity from the cooling fan and the cooling channel cross-sectional aspect ratio on the stack temperature and required power input were examined. The present numerical results showed that the cooling efficiency significantly increase with cooling channel cross-sectional aspect ratio. Futhermore, it was shown that replacement of the square bipolar plates to rectangular ones can also reduce the required input power by the cooling system.