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이의현(Ui-hyun Lee),이철희(Chul-hee lee),홍창봉(Chang-bong Hong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In order to protect passengers in the vehicle collision, several applications are installed in vehicle for safety. Airbag is one of the applications installed in vehicles and its performance is evaluated by the distance between passengers and airbag itself. In this study, the distance between passengers and airbag is controlled by moving passenger seats with BLDC(Brushless DC) motor. The experimental result shows that the velocity of the seat meets the minimum requirement for this case. To validate its feasibility, the simulation of intergrated system of airbag and controlled passenger seat is conducted through LS-Dyna. In the simulation result, the impact on the passenger’s head is decreased. The actual dummy test will be conducted to validate this system.
이의현(Lee Ui-Hyun),이동근(Lee Dong-Guen),박용구(Park Yong-Koo),김민균(Kim Min-Gyun) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Since vibration problems in high-rise structures are increased, a sky-bridge is used not only for emergency services but also as a vibration control device. The purpose of this study is to investigate the possibility of vibration control of structures using the sky-bridge connecting two high-rise buildings and to propose the optimum conditions for the sky-bridge. Time history analyses of example structures, 40-story and 50-story structures connected by sky-bridge were performed to investigate the dynamic response of structures with various locations of the sky-bridge and the natural frequency ratio of two structures.
이의현(Ui-Hyun Lee),이철희(Chul-Hee Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In-wheel motor electric vehicle which does not need power train such as constant velocity joint and propeller shaft is being used to drive in urban area. However it can be used only in urban area. However its maximum velocity is limited under 60㎞/h in the area. Because when velocity of vehicle is high, the performance becomes low. So it is needed to develop a method that improves performance of vehicle. In this paper In-wheel motor electric vehicle model is made by using AFPM(Axial Flux Permanent Magnet) and planetary gear is used to change gear ratio to improve the performance of regenerative braking. If the velocity is high, small gear ratio is used to improve fuel efficiency, and if vehicle is braking, large gear ratio is used to improve the performance of regenerative braking. In this paper AVL Cruise is used to confirm the improvement of performance.
스카이브릿지 설치위치에 따른 고층건물의 진동제어 성능평가
김현수,박용구,고현,이의현,이동근,Kim, Hyun-Su,Park, Yong-Koo,Ko, Hyun,Lee, Ui-Hyun,Lee, Dong-Guen 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.3
In this study, the vibration control effect according to the installation location of the sky-bridge and the difference of natural periods of the connected buildings has been investigated. To this end, 40-story and 50-story building structures connected by a sky-bridge were used as example structures and the equivalent modeling method was used. Boundary nonlinear time history analyses were performed using El Centro and Taft earthquakes to investigate the dynamic behavior of the example structures and vibration control effect of the sky-bridge. Based on numerical results, it has been shown that displacement responses can be effectively controlled as the installation floor of the sky-bridge increases and acceleration responses can be effectively reduced when the sky-bridge is installed on the mid-stories of the example building. 본 연구에서는 스카이브릿지 설치위치 및 연결된 구조물의 고유진동주기 차이에 따른 전체 구조물의 진동제어 효과를 분석하였다. 이를 위하여 스카이브릿지로 연결된 40층과 50층 구조물을 예제 구조물로 사용하였고, 등가모형화기법을 이용하여 예제 모델을 구성하였다. El Centro 및 Taft 지진을 사용하여 경계비선형 시간이력해석을 수행하였고 구조물의 동적거동과 진동제어 효과를 분석하였다. 해석결과 변위응답은 스카이브릿지를 상부층에 설치할수록 더 효과적으로 제어할 수 있었고 가속도응답은 구조물의 중간층부근에 설치할 때 더 효과적으로 저감시킬 수 있었다.
김민균(Kim Min-Gyun),이동근(Lee Dong-Guen),박용구(Park Yong-Goo),이의현(Lee Ui-Hyun) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Serviceability problems may be induced in a high-rise building due to lateral loads such as earthquakes or winds. Shear walls in building structures are coupled shear wall systems because of openings. In this study, the application of LRBs for the vibration control of coupled shear wall systems was investigated. Seismic analyses of 10- and 20-story 2D coupled shear wall systems were performed using El Centro(1940) and Taft(1952) earthquake records. According to the analysis results, the seismic response of coupled shear wall systems with LRBs installed at the coupling beams could be effectively reduced.