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캠퍼스 위험물질 특성을 고려한 합리적 관리방안 도출에 관한 연구
최서호(Seo Ho Choi),이인복(In-Bok Lee),이익모(Ik-Mo Lee) 한국위험물학회 2018 한국위험물학회지 Vol.6 No.1
Recent progress in research in science and technology has been carried out in various combinatory and diverse ways, and the potential dangers associated with research activities are increasing along with research progress. The actual response to these dangers is not managed by laboratory safety law applied to laboratories with high current risk but it is actually managed by other laws and regulations. By doing so, it is urgently necessary to prepare an environment in which safe research activities can be conducted and to prepare rational management strategies for the prevention of safety hazards in laboratories of hazardous substances. Therefore, in this research, we selected two buildings that use the most harmful factors for two universities, 131 Analyzing the current situation and issues through on-site inspection surveys of harmful factors used in laboratories, Based on the situation of general safety management of domestic and foreign campuses, we suggested suggestions through discussion about the chemical substance management system of laboratories on campus in korea. In addition, the laboratory management system based on individual laws and regulations applied to campus laboratories has reached its limits, and laboratory workers who are applying this will have substantial institutional, administrative and conscious aspects We will try to explore 3P (People, Process, Property) capacity building measures to establish solutions. We intend to establish the standard of the site-centric management system to rationally lower the risk in handling harmful factors at university by incorporating the derived final conclusion into the actual research site.
유성필(Seong-Pil Ryu),최서호(Seo-Ho Choi),유기호(Ki-Ho Yoo),안병기(Byung-Ki Ahn),황인철(In-Chul Hwang),임태원(Tae-Won Lim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Kia Motor Company(KMC) has developed the fuel cell hybrid electric vehicle named Mohave FCEV powered by 115㎾ Kia fuel cell stack and hybridized with super-capacitors. The previous version is the Sportage FCEV, which was powered by 80㎾ Kia fuel cell stack and hybridized with Lithium-ion polymer battery. For the traction motor, a PMSM(Permanent Magnet Synchronous Motor) is developed to replace the induction motor in order to increase the vehicle efficiency and the performance. The power of developed motor is 110㎾ in maximum and 55㎾ in continuous, it was 80㎾ in maximum and 40㎾ in continuous in the induction motor which was used in Sportage FCEV. With the increased fuel cell stack and the motor power, it reached 100㎞/h in 12.8 seconds from standstill. Total 633㎞ driving range was verified with the SF → LA road test on a single charge thanks to the increased efficiency of the fuel cell stack and electric power train and to the 700bar hydrogen tank system.
연료전지 자동차용 LDC를 위한 고전력 밑도 양방향 DC-DC 컨버터
김형준(Kim, Hyung-Joon),최세완(Choi, Se-Wan),강호성(Kang, Ho-Sung),최서호(Choi, Seo-Ho) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
본 논문에서는 연료전지자동차의 저전압 배터리 충{cdot}방전을 위한 3상 양방향 DC-DC 컨버터를 제안한다. 제안한 3상 컨버터는 기존의 단상 컨버터에 비해 인터리빙 효과의 증대로 인한 입{cdot}출력 필터 사이즈 감소와 변압기의 이용률 증가로 인한 VA정격의 감소가 가능하며, 기존의 위상제어 방식의 3상 컨버터와 달리 입{cdot}출력전압이나 부하변동에 따른 무효 전류의 중가 문제가 없다. 또한 MOSFET 스위치를 사용하여 고전압 측에서는 비대칭 소프트 스위칭을 성취할 수 있고, 저전압 측에서는 동기정류 방식을 적용하여 도통손실을 감소시킬 수 있어 효율과 전력밀도를 더욱 향상 시킬 수 있다. 본 논문에서는 제안하는 3상 양방향 DC-DC 컨버터의 동작원리와 기존방식과의 비교분석을 수행하였으며 시뮬레이션을 통해 검증하였다.
회생 제동 에너지 회수율 최대화 및 차량 안전성 보장을 위한 하이브리드 연료 전지 자동차의 회생 제동 협조 제어
한지훈(Jihun Han),박영진(Youngjin Park),박윤식(Youn-sik Park),유성필(Seongpil Ryu),최서호(Seo-ho Choi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
One of the most important control problems to improve fuel economy in fuel cell hybrid electric vehicle is cooperative regenerative braking control strategy because the electric motor can convert the kinetic or potential energy into electric energy that can be stored in super-capacitor and reused. In this study, an electric motor for regenerative braking is directly connected to the front drive axle only because front-wheel drive vehicle is common for passenger vehicle. Vehicle stability can be lost in case regenerative braking torque is applied only to front wheels for maximum braking energy recovery, i.e., FCHEV might get into an unstable motion called lock-up and understeer. Therefore, we propose systematic controller guaranteeing the vehicle stability while guaranteeing maximum regenerative braking energy recovery. Upper controller generates the desired yaw moment calculated by using LQR method for following the desired the yaw rate and side slip angle. And lower controller applies optimal regenerative braking torque and mechanical braking torque independently within equality constraints (the required total longitudinal force and yaw moment) and inequality constraints (friction circle) for optimal regenerative braking energy recovery. Carsim™ computer simulation is used to verify the effectiveness of the proposed controller.