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김소룡,하넉산,구남서,배병운,김태흔,고한서,이창섭,Jin, Xiaolong,Ha, Ngocsan,Goo, Namseo,Bae, Byungwoon,Kim, Taeheun,Ko, Hanseo,Lee, Changseop 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.3
Piezoelectric-based hydraulic actuator is a hybrid device consisting of a hydraulic pump driven by piezoelectric stacks that is coupled to a conventional hydraulic cylinder via a set of fast-acting valves. Nowadays, such hybrid actuators are being researched and developed actively in many developed countries by requirement of high performance and compact flight system. In this research, a piezoelectric hybrid actuator has been designed and tested. To achieve bi-directional capabilities in the actuator, solenoid valves were used to control the direction of output fluid. The experimental testing of the actuator in uni-directional and bi-directional modes was performed to examine performance issues related to the solenoid valves. The results showed that the bi-directional performance was slightly lower than uni-directional performance due to air bubble developed in the valve system. A new design to solve the vacuum problem has been proposed to improve the performance of the hybrid actuator.
마이크로 노즐 내부 표면개질을 통한 유동제어의 실험적 연구
변도영(Doyoung Byun),김지훈(Jihoon Kim),엄성환(Seonghwan Eom),한규일(Kyuil Han),고한서(Hanseo Ko) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Recently, the research of microfluidics has been widely studied by many researchers, because the microfluidics system has been used in several fields such as lab-on-a-chip in medicine, colloid thruster in aerospace, microhydrodynamic in engineering, etc. The hydrophobic and hydrophilic internal surfaces are very important property to optimally design the microfluidic system. However, until now, no investigation is performed experimentally and theoretically to understand the flow instability and change of meniscus shape depending on the surface affinity in the microchannel. In this study, we visualized experimentally the flow characteristics in the microchannel whose surface is divided into hydrophilic and hydrophobic regions sequencially. For the hydrophilic and hydrophobic surfaces arrangement, when the meniscus reaches the interface region, the meniscus shape changes from concave to convex and the velocity near the centre increases.
전기장 수치 해석 및 실험을 통한 EHD 잉크젯 전극 설계
김용재(Yong Jae Kim),최재용(Jaeyong Choi),손상욱(Sanguk Son),안기철(Kichul Ahn),고한서(Hanseo Ko),이석한(Sukhan Lee) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
An electrohydrodynamic (EHD) ink-jet head shows advantages to print micro-size patterns because it can generate sub-micron droplets and can use highly viscous inks. Since the basicprinciple of the EHD ink-jet is to form a droplet from an apex of the meniscus at the end of the nozzle, the stable ejection of the droplet is greatly affected by the electric field intensity, which is influenced by shape of the nozzle and electrode. Hence, we tried to do some electric field simulations using various shapes of the electrodes. Some simulation results were quite different from conventional equation of the pin-to-plate model. In this paper, we suggest a guide line for proper design of the electrode for EHD inkjet.
전도성 잉크의 제팅 비교 및 조건 연구를 통한 pulsed jet 토출 특성을 갖는 정전기장 유도 EHD 잉크젯 헤드 시스템
최재용(Jaeyong Choi),김용재(Yong Jae Kim),손상욱(Sang-Uk Son),안기철(Ki-Chul An),고한서(Hanseo Ko),이석한(Sukhan Lee) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
The electrostatic field induced EHD (electro-hydro-dynamic) inkjet printing technology which is based on EHD jet theory is very attractive process for replacing conventional inkjet printing technology. A microdripping mode and pulsed-jet mode are the best characteristic ejection mode for drop-on-demand jetting and high resolution in electrostatic field induced EHD inkjet head system. The electrical conductivity of ink is very important factor to show pulsed-jet mode. Many conductive inks are bad ejection characteristics, but some inks which has specific electrical conductivity region has good ejection characteristics. The electrostatic field induced EHD inkjet head system with pulsed-jet ejection will be good industrial inkjet printing system by manufacturing the conductive ink which has in specific electrical conductivity region.