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RISS 인기검색어
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- 저자 : 최기봉(Choi, Ki Bong) (검색결과 314 건)
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IR spectrometer 를 이용한 부유 입자의 IR 차폐능 측정
최기봉,고은미,안경일 ( Ki Bong Choi,Eun Mee Goh,Kyung Il Ahn ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.4
To examine the correlationship between IR attenuation and physical properties of suspended particles, IR spectrometer can be used effectively. Several graphite flakes and metallic powders were suspended in a liquid cell and the IR attenuations were measured. The results were analyzed in terms of their physical properties such as shape, purity and mean particle size. It was found out that the powder which had smaller mean size, higher purity and more developed flake type showed higher IR attenuation. JG02 and BR06 showed the highest mass and volume extinction coefficient, α=1.41 ㎡/g, β=2.7 ㎡/㎤, respectively. This technique was considered as more efficient method than the conventional one using aerosol chamber. It could reduce the error caused by external factors and was even more simple to measure the physical effects of various kinds of suspended powders.
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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.
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최기봉,윤희주,차승희,최정도,Choi, Ki-Bong,Youn, Hee-Ju,Cha, Seung-Hee,Choi, Jung-Do 한국센서학회 1997 센서학회지 Vol.6 No.5
광섬유 소산파 센서(fiber-optic evanescent wave sensor)를 제작하였다. 클래드층을 제거한 광섬유 코아 표면에 anti-mouse immunoglobulin G(IgG)를 결합시키고, 형광이 표지된 mouse IgG와의 반응을 직접적인 방법과 경쟁적인 방법을 통하여 측정하였다. 직접적인 방법과 경쟁적인 방법 모두 $1{\mu}g/m{\ell}$이하의 mouse IgG를 측정할 수 있는 감도를 얻을 수 있었다. Anti-mouse IgG는 단순 흡착 방법에 의하여 광섬유 코아 표면의 93.9%에 고정되었고 비특이적 결합반응을 제거하기 위하여 실시한 소혈청 알부민(bovine serum albumin : BSA)을 이용한 표면 코팅 효과는 없었다. Mouse IgG에 결합된 fluorescein의 비율이 높을수록 형광 발생량이 많았으나 관계는 직선적이지 않았다. 본 연구에서 제작된 광섬유 소산파 센서는 $1{\mu}g/m{\ell}$ 이하의 항원 항체 반응을 소산파 여기에 의한 형광량으로 측정할 수 있어 면역센서로의 응용이 가능할 것으로 판단된다.
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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 $900^{\circ}C{\cdot}h^{0.4}$.
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Min-Max 알고리즘을 이용한 피에조 구동형 스테이지의 최적설계 및 성능평가
최기봉(Kee-Bong Choi),한창수(Chang Soo Han) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.9
This paper presents an optimal design and the performance evaluation of two-axis nano positioning stage with round notched flexure hinges. A flexure hinge mechanism with round notched flexure hinges is to guide the linear motions of a moving plate in the nano positioning stage. A Min-Max algorithm is applied to the design of the flexure hinge mechanism for nano positioning stage. In the design process, the structure of the flexure hinge mechanism is fixed, then the radius of a round hole and the width of two round holes are chosen as design variables, and finally the design variables are calculated by the Min-Max algorithm. The machined flexure hinge mechanism, stack type PZTs for actuation and capacitance type displacement sensors for position measurement are assembled into the nano positioning stage. The experimental results of the manufactured nano positioning stage show the first modal resonance frequency of 197 ㎐, the operating range of 40 ㎛, and the resolution of 3 ㎚.
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간단한 정기구학을 갖는 평면운동용 병렬 매니퓰레이터의 구동영역 및 기구학적 특성
최기봉(Kee-Bong Choi) Korean Society for Precision Engineering 2003 한국정밀공학회지 Vol.20 No.3
This paper proposes a new parallel manipulator for plane motion, and then discusses on the workspace and kinematical characteristics of the manipulator. The conventional planar parallel manipulators have some disadvantages which are complex non-closed type direct kinematics, workspaces containing useless voids, and concave type border lines of workspaces. The proposed planar parallel manipulator overcomes the above disadvantages, that is, the manipulator has simple closed type direct kinematics, a void-free workspace, and a convex type borderline of a workspace. This paper shows the simulation result of the workspace as well as performance indices using a homogeneous inverse Jacobian.
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