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Hongki Yoo,Seungwoo Lee,Dongkyun Kang,Taejoong Kim,Daegab Gweon,Sukwon Lee,Kwangsoo Kim 한국정밀공학회 2006 International Journal of Precision Engineering and Vol.7 No.4
Confocal scanning microscopy is a measurement technique used to observe micrometer and sub-micrometer features due to its high resolution, nondestructive properties, and 3D surface profiling capabilities. The design, implementation, and performance test of a confocal scanning microscopy system are presented in this paper. A short-wavelength laser (405 ㎚) and an objective lens with a high numerical aperture (0.95) were used to achieve the desired high resolution, while the x-and y-axis scans were implemented using an acousto-optic deflector and galvanomirror, respectively. An objective lens with a piezo-actuator was used to scan the z-axis. A spatial resolution of less than 138 ㎚ was achieved, along with successful 3D surface reconstructions.
유재석(JaeSuk Yoo),김광수(KwangSoo Kim) 항공우주시스템공학회 2018 항공우주시스템공학회 학술대회 발표집 Vol.2018 No.11
구조설계 검증과 무게 감량을 위하여 SUS630 기존 소재와 AL7075-T651 신규 소재로 제작된 75톤 터보펌프 지지대에 대한 구조시험을 수행하였다. 변위와 변형률 게이지를 부착하여 지지대 특성과 안전성을 파악하였다. 터보펌프 지지대의 라드엔드 베어링 한계하중 (100 kN)까지 정적시험을 수행하였고, 75톤 엔진 지상연소 시험에서 측정한 반복하중에 안전계수를 감안하여 반복하중 크기를 설정하였다. 알루미늄과 SUS630 소재의 터보펌프 지지대 모두 구조 안전성을 시험으로 검증하였다. 기존 SUS630 소재의 터보펌프 지지대를 알루미늄 소재로 대체하여 약 3.4 kg을 감량하였다.
유동열(Dongyeol Yoo),김재완(Jaewan Kim),조광수(Kwangsoo Cho),범현균(Hyenkyun Beom),권오성(Osung Kwon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study describes a numerical simulation technique using finite element method for improvement of US NCAP side impact performance. The side impact analyses were conducted to reduce the injury value of occupant using LS-DYNA. In order to improve side impact performance, the base model was correlated with test results and a many of cases design study were carried out. These were modified front and rear door structure and door trim pad that were affected to dummy injury by direct contact under side impact. In this study, by changing of door structure and door trim pad shape, optimal design for reducing dummy injury value was obtained.
후륜조향 시스템 “RWS”적용을 통한 차량 조종 안정성 개선
유승범(Sungbem Yoo),백훈열(Hoonyeol Baek),최광수(Kwangsoo Choi) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
The front steering system is a main trend of vehicle steering systems. This system is only upon the lateral force which is generated by front tires and then the force makes yaw moment that achieved driver’s intend. This is convenient and effective steering system at normal speed but, at high speed, this system reaches the limit especially sudden steering and braking ; under, over steering, fish tail phenomenon. VDC and etc. auxiliary brake systems make up for this limit. But once the vehicle was lost its control, these auxiliary systems didn’t fulfill its function. Therefore, for improving stability of vehicle behavior and reducing fundamental steering error, developing rear wheel steering system is necessary. In this paper, we has conduct a design from each part to the system and verify its performance.
Lee, Jieun,Yoo, Jin,Kim, Joonwon,Jang, Yeongseon,Shin, Kwangsoo,Ha, Eunsu,Ryu, Sangryeol,Kim, Byung-Gee,Wooh, Sanghyuk,Char, Kookheon American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.6
<P>Anti-biofouling has been improved by passive or active ways. Passive antifouling strategies aim to prevent the initial adsorption of foulants, while active strategies aim to eliminate proliferative fouling by destruction of the chemical structure and inactivation of the cells. However, neither passive antifouling strategies nor active antifouling strategies can solely resist biofouling due to their inherent limitations. Herein, we successfully developed multimodal antibacterial surfaces for waterborne and airborne bacteria with the benefit of a combination of antiadhesion (passive) and bactericidal (active) properties of the surfaces. We elaborated multifunctionalizable porous amine-reactive (PAR) polymer films from poly(pentafluorophenyl acrylate) (PPFPA). Pentafluorophenyl ester groups in the PAR films facilitate creation of multiple functionalities through a simple postmodification under mild condition, based on their high reactivity toward various primary amines. We introduced amine-containing poly(dimethylsiloxane) (amine-PDMS) and dopamine into the PAR films, resulting in infusion of antifouling silicone oil lubricants and formation of bactericidal silver nanoparticles (AgNPs), respectively. As a result, the PAR film-based lubricant-infused AgNPs-incorporated surfaces demonstrate outstanding antibacterial effects toward both waterborne and airborne <I>Escherichia coli</I>, suggesting a new door for development of an effective multimodal anti-biofouling surface.</P> [FIG OMISSION]</BR>