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로봇을 이용한 원격탐사를 위한 3차원 센서 시스템 개발
윤재식(J. S. Yoon),박재한(J. H. Park),백문홍(M. H. Baeg),신용득(Y. D. Shin),장가람(G. R. Jang),배지훈(J. H. Bae) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
원격탐사 시 3차원 센서 시스템의 개발은 로봇이 임무를 수행하는 데 있어 중요하다. 3차원 센서 시스템을 통한 원격 탐사는 2차원 카메라를 이용한 원격탐사와는 달리 거리 값을 시각화활 수 있기 때문에 로봇의 모델을 추가하여 시뮬레이션을 할 수 있으며, 더욱 정밀한 임무를 수행할 수 있다. 3차원 공간정보를 획득하기 위해서 Sick社의 LMS111과 같은 레이저 스캐너 또는 Microsoft社의 KINECT와 같은 깊이 감지 센서를 이용할 수 있지만, KINECT와 같은 센서는 실외에서 사용할 수 없으므로 본 논문에서는 2차원 LRF(Laser Range Finder)를 이용하여 실외에 대한 최대 30m 거리의 3차원 공간 정보를 획득하였다. 원격로봇에 장착된 LRF와 KINECT로부터 획득한 3차원 공간 정보는 UDP통신을 통하여 원격작업지에 있는 PC로 전송이 되며, 이러한 공간정보를 사용하여 원격탐사를 수행한다. 본 논문에서는 로봇을 이용한 원격 탐사를 위하여 LRF와 KINECT센서를 이용한 3차원 센서 시스템 개발 방법을 제안한다.
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.
MCFC 양극측에서 Al-Cr피복 스테인레스강 분리판의 내식성평가
이민호,윤재식,배인성,윤동주,김병일,박형호,Lee, M.H.,Yoon, J.S.,Bae, I.S.,Yoon, D.J.,Kim, B.I.,Park, H.H. 한국재료학회 2003 한국재료학회지 Vol.13 No.2
In order to evaluate the corrosion resistance at the anode side separator for molten carbonate fuel cell, STS316 and SACC-STS316 (chromium and aluminum were simultaneously deposited by diffusion into STS316 authentic stainless steel substrate by pack-cementation process) were applied as the separator material. In case of STS316, corrosion proceeded via three steps ; a formation step of corrosion product until stable corrosion product, a protection step against corrosion until breakaway occurs, a advance step of corrosion after breakaway. Especially, STS316 would be impossible to use the separator without suitable surface modification because of rapid corrosion rate after formation of corrosion product, occurs the severe problem on stability of cell during long-time operation. Whereas, SACC-STS316 was showed more effective corrosion resistance than the present separator, STS316 due to the intermetallic compound layer such as NiAl, Ni3Al formed on the surface of STS316 specimen. And it is anticipated that, in order to use SACC-STS316 alternative separator at the anode side, coating process, which can lead to dense coating layer, has to be developed, and by suitable pre-treatment before using it, very effective corrosion resistance will be achieved.
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.
박상언,윤재복,유상신,Park, S.A.,Yoon, J.B.,Yoo, S.S. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.4
An experimental investigation of the stenosis effects on the pressure drop and flow change in the internal flow is presented. Stainless steel tubes of small diameter(3.175mm, 3.4mm) are used for the test section of the flow loop. Percent contraction ranges from 35% to 83% and the stenosis length ratio (L/d) is varied from 2.8 to 8. Water and aqueous glycerol solutions are used for Newtonian fluids and polymer solutions of Separan AP-273 (500 wppm, 1000 wppm) for non-Newtonian fluids. Pressure loss coefficients of non-Newtonian fluids decrease just as those of Newtonian fluids. The loss coefficients of Newtonian and non-Newtonian fluids increase as the percent contraction increases and the loss coefficients of non-Newtonian fluids are larger than those of Newtonian fluids for the same stenosed tube. The loss coefficient increases as the stenosis length ratio increases.
티타늄 산화물과 유화물의 전지 전압을 결정하는 요소에 대한 제일원리계산
김희진(H. J. Kim),문원진(W. J. Moon),김영민(Y. M. Kim),배경서(K. S. Bae),윤재식(J. S. Yoon),이영미(Y. M. Lee),국진선(J. S. Gook),김양수(Y. S. Kim) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.1
Electronic structures and chemical bonding of Li-intercalated LiTiS2 and LiTiO₂ were investigated by using discrete variational Xα method as a first-principles molecular-orbital method. α-NaFeO₂ structure is the equilibrium structure for LiCoO₂, which is widely used as a commercial cathode material for lithium secondary battery. The study especially focused on the charge state of Li ions and the magnitude of covalency around Li ions. The average voltage of lithium intercalation was calculated using pseudopotential method and the average intercalation voltage of LiTiO₂ was higher than that of LiTiS2. It can be explained by the differences in Mulliken charge of lithium and the bond overlap population between the intercalated Li ions and anions in LiTiO₂ as well as LiTiS₂. The Mulliken charge, which means the ionicity of Li atom, was approximately 0.12 in LiTiS₂ and the bond overlap population (BOP) indicating the covalency between Ti and S was about 0.339. One the other hands, the Mulliken charge of lithium was about 0.79, which means that Li is fully ionized. The BOP, the covalency between Ti and O, was 0.181 in LiTiO₂. Because of high ionicity of Li and the weak covalency between Ti and the nearest anion, LiTiO₂ has a higher intercalation voltage than that of LiTiS₂.
돈사료의 영양가에 관한 연구 1 . 돈 ( 豚 )의 대맥처리별 가소화양분 및 질소축적량 비교연구
김강식 ( K S Kim ),윤재인 ( J I Yoon ),이종원 ( J W Lee ),이창영 ( C Y Lee ) 한국축산학회 1973 한국축산학회지 Vol.15 No.1
This experiment was conducted with four heads of castrated Landrace swine to compare the effects of ground, steamed and soaked barley on digestibility, nitrogen retention and rate of gain for 65 days. The results obtained in this study are as follows. 1. When the ground barley was fed, the digestibilities of crude protein and crude fiber were 58.35% and 39.72%. DCP and TDN calculated on this base were 8.40% and 58.35% These figures were statistically significant when compared to other treatments. However, there was no significant difference between the treatments when a Nretention was compared. 2. The average weight gains of pigs, during the test period, fed ground barley, steamed barley, soaked barley were 3.0, 2.8, 2.9 ㎏ respectively. They seemed to be paralleling with digestibility.