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압전 액츄에이터의 메니스커스 제어를 통한 온 디멘드(On-demand) 전기 수력학 프린팅
김영재(Y. J. Kim),김도형(D. H. Kim),황정호(J. H. Hwang),김용준(Y. J. Kim) 한국정밀공학회 2009 한국정밀공학회 학술발표대회 논문집 Vol.2009 No.6월
On-demand ejection of ultra-fine droplets that uses both electrohydrodynamic (EHD) force and mechanical actuation is presented. The liquid meniscus was controlled by a piezoelectric actuator and droplets were ejected by EHD force. Through these effects, it was possible to obtain a high operational jetting frequency of 5㎑ with a short delay-time (about 50 us) when compared with existing on-demand EHD jetting methods, such as the pulsating jet mode (3-10 msec) and the pulsed-voltage cone-jet mode(3.6 msec). Also, we obtained ultra-fine droplets at a volume that was at the femto-liter level simultaneously. The jetting characteristics were examined for both hydrophobicity and hydrophilicity of the surface of a capillary.
2000cc 세단 트렁크용 휠체어 리프트 시스템 구축을 위한 기구학 및 제어 연구개발
김영재(Y. J. Kim),나선준(S. J. Na),김태운(T. U. Kim),김용석(Y. S. Kim),양순용(S. Y. Yang) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
When wheelchair users use a car, a situation occurs in which the wheelchair must be loaded on the vehicle trunk. Wheelchair users are assisted by others for loading wheelchair on the car"s trunk. However, due to the weight of the wheelchair and the inconvenient structure of the wheelchair, the normal person also have difficulty in loading and unloading. Therefore, it is necessary to provide an auxiliary system to help the disabled to load the wheelchair in the trunk when boarding the vehicle. This system design studies the wheelchair lift system in the narrow trunk space of the 2000cc class sedan. Mechanisms are constructed to load and unload 15kg wheelchair within 80sec, and controlled by the Arduino-based control system. Future research will develop the system that automatically transports wheelchair from the driver"s seat to the wheelchair cage and will complete the automatic wheelchair transport-lift system by connecting with the lift system.