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김영수(Y.S Kim),김영동(Y.D Kim),전형석(H.S Jeon),신석두(S.D Shin),오금곤(G.G Oh) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
In this paper, We are inclined to design automated mushroom-cultivation system technology grafting communication technology as CAN(Control Area Network). Mushroom cultivation automated system have a goal to construct stable crop cultivation system ,as we construct embedded-system that can make into one to advance current system. Its sensor part is composed of temperature , humidity and CO2 concentration sensor and of chilling , heating and unit humidity-controlling unit, ventilation fan. In particular, having saved analized temperature, humidity, CO2 concentration data in each sensor ,CAN which can control realtime communication is used to analyze the next mushroomcultivation.
김동옥(D.O.Kim),정국영(G.Y.Jung),오금곤(G.K.Oh),김영동(Y.D. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
To control the position, velocity and torque of the ultrasonic motor, a great variety of method are proposed such as the amplitude, phase difference, frequency and so on In the case of phase difference method, it has some advantages, it can control the direction and velocity of rotation only adjusting the phase difference and It has wide control-band During the USM driving on adjusting phase difference, Its characteristic was transformed by the change of resonance-frequency of stator, which means that the resonance frequency is different according to the phase difference Consequently, we need to set up the most suitable driving frequency according to each phase difference
김영수(Y.S.Kim),김아현(A.H.Kim),배철(C.Bae),강원찬(W.C.Kang),김영동(Y.D.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In this paper, the virtual-reality system is tried to developed, which controls not only the sense of sight and hearing but also the sense of touch, In order to develope the sense of touch in This study, the stable tactual transaction-system, based on summing up the basic algorithm and theory, is embodied The hardware of This system consists of the 6DOF haptic interface, a controller and a driver In the case of the software, the proxy algorithm is applied for the force-transaction and the mopping algorithm is used for graphic transaction In addition to This, the imaginary-device driver is utilized for controlling the system and manager-class is also included m This system to manage the position-change and the like<br/> Consequently, the proxy algorithm is applied, which makes the system possible to be more stable and prompt with and imaginary object Moreover, the Impulse-algorithm is applied to work out a problem which the tactual transaction-period is different from the graphic transaction -period
Vacuum Ultra Violet Spectroscopic Ellipsometry 를 이용한 BaSm₂Ti₄O<SUB>12</SUB> 의 광 특성 연구
황순용(S. Y. Hwanga),윤재진(J. J. Yoon),정용우(Y. W. Jung),변준석(J. S. Byun),김영동(Y. D. Kim),정영훈(Y. H. Jeong),남산(S. Nahm) 한국진공학회(ASCT) 2009 Applied Science and Convergence Technology Vol.18 No.1
본 연구에서는 분광타원분석법을 이용하여 최근 주목 받고 있는 microwave dielectric materials 인 BaSm₂Ti₄O12 박막의 광특성을 0.92 ~ 8.6 eV 에너지 영역에서 분석하였다. 광역 에너지영역에서 측정이 가능한 Vacuum Ultra Violet spectroscopic ellipsometer 를 사용하여 시료의 광 스펙트럼을 측정 하였으며, 측정된 스펙트럼으로부터 BaSm₂Ti₄O12 박막의 광 특성을 얻기 위하여 Tauc-Lorentz 분산 함수를 이용하였고, 고 에너지 영역대의 새로운 피크구조 (structure) 를 최초로 발견하였다. We performed a study on optical properties of BaSm₂Ti₄O12 thin films by vacuum ultra violet spectroscopic ellipsometry in the 0.92~8.6 eV energy range. For the analysis of the measured ellipsometric spectra, a 5-layer model was applied where optical property of the BaSm₂Ti₄O12 layer was well represented by a Tauc-Lorentz dispersion function. Our analysis clearly showed new structure in high energy region at about 7.5 eV. Consistent changes of refractive index & extinction coefficient of the BaSm₂Ti₄O12 thin film by the growth and annealing temperatures were also confirmed.
김아현(A.H.Kim),김영수(Y.S.Kim),배철(C.Bae),강원찬(W.C.Kang),김영동(Y.D.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
Accurate acquisition of surface geometries such as machined surfaces, biological surfaces, and deformed parts have been very Important technique in scientific study and engineering, expecially for system design, manufacturing and inspection. Two camera method keeps accuracy more than double than mechanical method<br/> In tins paper, we describe the processes surface data of teeth for automatic processing, transformation that changes to coping data of possible numeric data form. and processed inlay teeth.<br/> As the result of the Inlay manufacture, which can process with high resolution, therefore we construct the automatic processing system that depends on manual
윤재진,공태호,김영동,Yoon, J.J.,Ghong, T.H.,Kim, Y.D. 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.6
타원편광분석법은 반도체 물질의 광 특성과 전이점 연구에 유용하게 쓰이는 기술이다. 측정된 유전율 함수로부터 전이점을 구하기 위해서 전통적으로 이차 미분스펙트럼을 이용하여 분석하는데, 이 방법은 high frequency 의 잡음을 크게 증폭시키는 단점이 있다. 본 연구에서는 역 공간 푸리에 변환 (Fourier transform)을 이용하여 low-, medium-, high-index 의 푸리에 계수로부터 baseline, 정보, high frequency 잡음을 분리하는 방법을 소개하고자 한다. 이 방법을 이용하여 광전자소자에 폭넓게 사용되는 ZnCdSe 화합물 반도체의 $E_1,\;E_1+{\Delta}_1$ 전이점에 대한 연구를 하여 전통적인 이차 미분법과 비교해 보았다. Spectroscopic ellipsometry is an excellent technique for determining dielectric function. To obtain critical point energy, standard analytic critical point expression is used conventionally for second derivatives of dielectric function which might increase high frequency noise than signal. However, reciprocal-space analysis offers several advantages for determining critical point parameters in optical and other spectra, for example the separation of baseline, information, and high frequency noise in low-, medium-, high-index Fourier coefficient, respectively. We used reciprocal Fourier analysis for removing noise and determining critical point of ZnCdSe alloy.
Dielectric functions and interband transitions of InxAl1 xP alloys
김태중,S.Y. Hwang,J.S. Byun,D.E. Aspnes,E.H. Lee,송진동,C.-T. Liang,Y.-C. Chang,H.G. Park,J. Choi,J.Y. Kim,Y.R. Kang,J.C. Park,김영동 한국물리학회 2014 Current Applied Physics Vol.14 No.9
We report pseudodielectric functions <ε> from 1.5 to 6.0 eV of InxAl1 xP ternary alloy films. Data were obtained by spectroscopic ellipsometry on 1.2 mm thick films grown on (001) GaAs substrates by molecular beam epitaxy. Artifacts were minimized by real-time assessment of overlayer removal, leading to accurate representations of the bulk dielectric responses of these materials. Critical-point (CP) energies were obtained from numerically calculated second energy derivatives, and their Brillouin-zone origins identified by band-structure calculations using the linear augmented Slater-type orbital method.
황순용,윤재진,정용우,변준석,김영동,정영훈,남산,Hwang, S.Y.,Yoon, J.J.,Jung, Y.W.,Byun, J.S.,Kim, Y.D.,Jeong, Y.H.,Nahm, S. 한국진공학회 2009 Applied Science and Convergence Technology Vol.18 No.1
본 연구에서는 분광타원분석법을 이용하여 최근 주목 받고 있는 microwave dielectric materials 인 $BaSm_2Ti_4O_{12}$ 박막의 광 특성을 $0.92{\sim}8.6\;eV$ 에너지 영역에서 분석하였다. 광역 에너지영역에서 측정이 가능한 Vacuum Ultra Violet spectroscopic ellipsometer를 사용하여 시료의 광 스펙트럼을 측정 하였으며, 측정된 스펙트럼으로부터 $BaSm_2Ti_4O_{12}$ 박막의 광 특성을 얻기 위하여 Tauc-Lorentz 분산 함수를 이용하였고, 고 에너지 영역대의 새로운 피크구조 (structure) 를 최초로 발견하였다. We performed a study on optical properties of $BaSm_2Ti_4O_{12}$ thin films by vacuum ultra violet spectroscopic ellipsometry in the $0.92{\sim}8.6\;eV$ energy range. For the analysis of the measured ellipsometric spectra, a 5-layer model was applied where optical property of the $BaSm_2Ti_4O_{12}$ layer was well represented by a Tauc-Lorentz dispersion function. Our analysis clearly showed new structure in high energy region at about 7.5 eV Consistent changes of refractive index & extinction coefficient of the $BaSm_2Ti_4O_{12}$ thin film by the growth and annealing temperatures were also confirmed.
변수화 반도체 모델을 이용한 Cubic Zinc-blonde CdSe의 유전함수 분석
정용우,공태호,이선영,김영동,Jung, Y.W.,Ghong, T.H.,Lee, S.Y.,Kim, Y.D. 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.1
본 연구에서는 광전자 소자에 폭넓게 사용되는 ZnCdSe 화합물 반도체의 end-point인 CdSe의 유전함수 spectrum을 Vacuum Ultra Violet spectroscopic ellipsometry(타원편광분석법) 측정하여 분석하였다. 측정 결과는 변수화 모델을 이용하여 분석하였으며 그 결과 6 eV 이상에 존재하는 전자전이점들을 확인할 수 있었고 CdSe의 Critical Point(CP) 구조를 수치화 함으로써 온도나 화합물 함량에 따른 광특성 의존성 연구 등에 활용될 수 있는 database를 확보하였다. ZnCdSe alloy semiconductor was widely used for the optoelectronic device. And CdSe is the end-point in this material. In this work, we measured the dielectric function spectrum of cubic CdSe with Vacuum Ultra Violet spectroscopic ellipsometry and analysed this data with parametric model. As a result, we observed some of transition energy point over 6 eV and obtained the database for dielectric function spectrum, which could be used for temperature or alloy composition dependence study on optical property of CdSe.