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황동현(Dong Hyeon Hwang),이창식(Chang Sik Lee),이기형(Ki Hyung Lee),최서원(Seo Won Choi) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
The purpose of this paper is to show the performance charateristics of Roots type supercharger with two lobe rotor. The performance test were conducted to obtain the drive power, volumetric efficiency, and the influence performance factors of supercharger. With the flow characteristics of supercharger, the effect of the operating conditions on supercharger performance was investigated. The results show that the increase of supercharger speed and pressure ratio bring about the increase of drive power.<br/>
Self-seed layer를 이용하여 증착한 SBT박막의 특성
김형섭,황동현,윤지언,손영국,Kim, Hyung-Sub,Hwang, Dong-Hyun,Yoon, Ji-Un,Son, Young-Gook 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.3
[ $Pt/SBT/Seed/Pt/Ti/SiO_2/Si$ ]의 구조로 $SBT(SrBi_2Ta_2O_9)$ 박막을 Self-seed layer를 사용하여 R.F. Magnetron sputter를 이용하여 증착을 하였다. Self-seed layer는 기판온도 RT(room temperature)와 $600^{\circ}C$에서 두께 30 nm으로 증착하였다. Self-seed layer의 결정화 온도를 알아보기 위해 열처리온도를 변화시켰고 이를 XRD를 통하여 결정화 유무를 확인하였다. Self-seed layer 위에 증착한 SBT를 XRD와 전기적 측정을 통해 특성을 관찰하였다. Thin films of $SBT(SrBi_2Ta_2O_9)$ having $Pt/SBT/Seed/Pt/Ti/SiO_2/Si$ structure were fabricated using self-seed layer method by R.F. Magnetron sputter. Self-seed layers were deposited at room temperature and $600^{\circ}C$, which had 30 nm thickness. To investigate crystallization of self-seed layer we characterized by XRD after various heat treatment. And we characterized the crystallinity and electrical properties of SBT on self-seed layer after various heat treatment.
이창식(Chang Sik Lee),이기형(Ki Hyung Lee),최서원(Seo Won Choi),황동현(Dong Hyeon Hwang) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
This paper presents the performance characteristics of gasoline engine with Roots type supercharger. The performance investigation were conducted to obtain the effect of operation condition on the brake horsepower. and fuel consumption rate of the engine with supercharger. The results of this investigation show that the output performance characteristics of engine were affected on the change of the pulley ratio and pressure ratio. In this study, the influence parameters on the performance characteristics were discussed.
고현경 ( Hyun-gyeong Ko ),김택선 ( Taek-sun Kim ),황동현 ( Dong-hyun Hwang ),김형훈 ( Hyung-hoon Kim ),심현민 ( Hyeon-min Shim ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.2
로봇청소기를 사용한 고객들은 로봇청소기에 대한 만족도가 매우 높은 편이다. 이러한 이유는 인간이 신경 쓰지 못하는 지역까지 꼼꼼하게 청소하고, 단시간에 끝나는 인간에 비해 느리더라도 꾸준히 한, 두 시간 동안 지속적으로 움직이기 때문이다. 욕조에 물때를 제거할 수 있는 로봇을 생각해냈고, 사용자 없이 스스로 청소하는 자율 동작 기능과 모터를 이용한 솔질, 사용자가 청소가 깨끗하게 되었는지를 사진으로 모니터링 할 수 있다. 본 기술은 욕조 이외에 세면대, 싱크대 등에서도 활용될 수 있어, 개인 여가시간 확보 및 가사에 대한 스트레스 감소에 기여할 수 있을 것으로 예상된다.
김성국(Seong Guk Kim),조영근(Young Kuen Cho),고창용(Chang-Yong Ko),류제청(Jeicheong Ryu),김동현(Donghyung Kim),황동현(Dong Hyung Hwang),송예은(Ye Eun Song),김한성(Han Sung Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
Measuring shear force is important for investigating the pathology and prevention of pressure ulcers. In this study, we introduced a bi-axial shear transducer as a new shear sensor. The sensor is consisted of aluminum and polyvinyl chloride plates placed between quadrangular aluminum plates. The shear force on the interface between the human body and a stand-up wheelchair was measured during sitting or standing movements. Shear forces on the sacrum and ischium were almost five times higher than those on other sites during experiments periods. In conclusion, the proposed shear sensor may be reliable and useful for measuring the shear force on human?machine interfaces.