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자기력을 이용한 비접촉 6자유도 미소위치결정 기구의 개발-설계, 모델링 및 제어-
최기봉,박기환,김수현,곽윤근,Choi, Kee-Bong,Park, Kyi-Hwan,Kim, Soo-Hyun,Kwak, Yoon-Keun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
A magnetically levitated micro-positioner is implemented to avoid mechanical friction and increase precision. Since magnetic levitation system is inherently unstable, most concern is focused on a magnetic circuit design to increase the system dynamic stability. For this, the proposed levitation system is constructed by using an antagonistic structure which permits a simple design and robust stability. From the dynamic equations of motion, it is verified that the proposed magnetically levitated system is decoupled in 6 degree-of-freedom motion. Experimental results are presented in terms of time response and accuracy.
성숙도 방법을 이용한 불포화 폴리에스터 수지 폴리머 콘크리트의 압축강도 예측
최기봉,김남길,이윤수,연규석,Choi, Ki-Bong,Jin, Nan Ji,Lee, Youn-Su,Yeon, Kyu-Seok 한국농공학회 2017 한국농공학회논문집 Vol.59 No.6
This study investigated to predict the compressive strength of unsaturated polyester resin based polymer concrete using the maturity method. The test results show that the development of the compressive strength increased exponentially until an age of 24 hours. After 24 hours, the development of the compressive strength just increased gradually. This test result shows that the strength of unsaturated polyester resin based polymer concrete was developed mainly at the early age. Estimated datum temperature of unsaturated polyester resin based polymer concrete was $-20.67^{\circ}C$ which was much lower than of datum temperature ($-10^{\circ}C$) of Portland cement concrete. Also, this study result shows that the existing maturity index associated with Portland cement concrete was not applicable for polymer concrete because curing time of Portland cement concrete is different clearly with curing time of polymer concrete. The cause of different curing time was that there were different curing mechanisms between Portland cement concrete and polymer concrete. In order to best apply the experimental data to a model, CurveExpert Professional, the commercial software, was used to determine the predictive model regarding the compressive strength of unsaturated polyester resin based polymer concrete. As a result, Gompertz Relation or Weibull Model was an appropriate model as a predictive model. The proposed model can be used to predict the compressive strength, especially, it is more useful when the maturity is in the range between $40^{\circ}C{\cdot}h^{0.4}$ and $900^{\circ}C{\cdot}h^{0.4}$.
최기봉,윤희주,차승희,최정도 ( Ki Bong Choi,Hee Ju Youn,Seung Hee Cha,Jung Do Choi ) 한국센서학회 1997 센서학회지 Vol.6 No.5
Fiber-optic evanescent wave sensor was designed and fabricated to detect mouse immunoglobulin G(IgG) with decladed optical fiber on which anti-mouse IgG was immobilized. A sensitivity obtained by any direct or competitive method was lower than 1 ㎍/㎖. Anti-mouse IgG was immobilized on 93.9% of core surface of optical fiber by simple adsoption method. The effect of postcoating using bovine serum albumin to remove non-specific binding was not observed. As the ratio of fluorescein to mouse IgG increased, the fluorescence signal increased, but that increase showed no linear relationship. Our fiber--optic sensor system could be used as immunosensor by measuring evanescent fluorescence in antigen-antibody reaction with good sensitivity below lug/mP level.
최기봉(Kee-Bong Choi),이재종(Jae Jong Lee),김기홍(Gee Hong Kim),임형준(Hyung Jun Lim),정대성,신은주(Eun Joo Shin) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This paper proposed an alignment stage for contact-type lithography process such as nano-imprint lithography process. The alignment stage is of a compliant mechanism driven by stack-type piezo actuators. Six piezo actuators are employed for 3-DOF planar motion. This stage accomplishing a high stiffness due to an antagonistic arrangement of the piezo actuators is actuated by differential forces of the antagonistic arrangement of the piezo actuators. The stage is designed and then proposed a new operational principle to generate the planar motion of the stage.
최기봉 ( Ki Bong Choi ),이동곤 ( Dong Gon Lee ),노현구 ( Hyun Gu Roh ),이창식 ( Chang Sik Lee ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
The aim of this work is to investigate the effect of ambient conditions in the constant volume spray chamber on the mixture formation of diesel-ethanol blended fuels. In order to analyze the air and fuel mixture formation, spray behaviors were obtained from the visualization system, and the effects of ethanol blending fuels on the spray characteristics were compared to that of neat diesel fuel. In addition, the spray characteristics such as spray tip penetration, spray cone angle, and spray area of ethanol blended fuel were analyzed by using the visualization images obtained from visualization system. In order to visualize diesel-ethanol sprays, a visualization system composed of a blending fuel supply system, a high-speed CCD camera, a high-pressure spray chamber, and an image data acquisition system. This experimental results showed that the spray penetration of diesel and ethanol blended fuel was slightly longer than that of a neat diesel fuel. The spray cone angle of ethanol blends showed wider angle than that of diesel fuel by increased amount of the ethanol blending ratio. The spray tip penetration of diesel-ethanol blends decreased with the increase of fuel injection pressure, and spray cone angle increased in accordance with the increase of ambient pressure. In this work, the effect of ambient pressure on the spray macroscopic characteristics was conducted under the various ethanol blending ratios.
최기봉(Kee-Bong Choi),이재종(Jae Jong Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The nano imprint process is one of the next generation lithography has been mentioned as one of major nanoreplication<br/> techniques because it is simple process, low cost, high replication fidelity and relatively high throughput. This process<br/> requires a surface contact between a template with patterns and a wafer on a stage. After contact, the vertical moving<br/> the template to the wafer causes some directional motions of the stage. Thus the stage must move according to the<br/> motions of the template to avoid the damage of the transferred patterns on the wafer. This study is to develop the wafer<br/> stage with a passive compliance to overcome the damage. This stage is designed with the concept like that it has a<br/> monolithic, symmetry and planar 6-DOF mechanism.