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검측차(EM120) 측정결과를 이용한 원형틀림 복원 프로그램 개발
정우진(W. J. Chung),구병춘(B. C. Koo) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
All work related to maintenance of track has been impletemented on the basis of the measured result from EM series cars in Korea. However, since these types of cars measure only versine value of the track irregularities instead of the real ones, this method will cause the confusion to maintenance operators if commercial speed should increase. This study was showing and explaining the program developed to get the real irregularities from the versine value. Finally, the reconstruction profiles completed by two different methods were compared with artificial track irregularities to confirm the their practicality.
주기적으로 분극 반전된 MgO:LiNbO<sub>3</sub>를 이용한 리지형 광도파로 파장가변 소자 제작 및 특성
이형만,양우석,김우경,이한영,정우진,권순우,구경환,송명근,Lee, H.M.,Yang, W.S.,Kim, W.K.,Lee, H.Y.,Jeong, W.J.,Kwon, S.W.,Koo, K.H.,Song, M.G. 한국광학회 2008 한국광학회지 Vol.19 No.3
MgO가 첨가된 z-cut $LiNbO_3$를 이용하여 주기적으로 분극반전된 리지광도파로(Ridge-type Waveguide)를 제작하였으며 이를 적용하여 녹색광원 소자를 구현시 리지광도파로 높이 변화량과 분극반전주기비 변화량에 따른 이론적 결과와 실험적 결과를 비교 분석하였다. 이러한 비교분석을 위해 새로운 측정시스템을 구성하였으며, 이를 적용한 소자 측정 결과 중심파장은 1067.45 nm, 파장변환효율은 90.7%/$Wcm^2$ 및 파장변환효율곡선의 반치폭은 0.17 nm임을 확인하였다. 또한, 실험값과 이론값과의 비교결과 분극반전주기와 파장변환효율곡선의 반치폭 계산 오차는 각각 0.016 ${\mu}m$와 0.01 nm로 이론값이 실험값을 잘 예측함을 확인하였다. Wavelength converting devices with a ridge-type waveguide in periodically poled $MgO:LiNbO_3$ are made and characterized. The experimental results are compared with theoretical analysis on the effects of waveguide dimension and duty ratio of the periodically poled structure. To show the relationship of the conversion efficiency to those factors, a new measurement system is configured. That experimental results show that the center wavelength, normalized conversion efficiency and full width half maximum of the conversion efficiency curve are 1067.45 nm, 90.7%/$Wcm^2$ and 0.17 nm, respectively. Also, the estimated results of the duty period and full width half maximum of the conversion efficiency from theoretical calculations agreed well with experimental results with the errors of 0.016 ${\mu}m$ and 0.01 nm.
Fe/Au 이중층의 응집현상을 이용한 FePd 나노 점 형성에 관한 연구
구정우,김재민,류동훈,최범진,김동우,이두헌,김은일,미타니 세이지,가미코 마사오,하재근,Koo, J.K.,Kim, J.M.,Ryua, D.H.,Choi, B.J.,Kim, D.W.,Lee, D.H.,Kim, U.I.,Mitani, S.,J.G., M. Kamiko,Ha, J.G. 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.1
자기조립화된 Fe/Au 이중층 위에 $L1_0$형 구조를 갖는 FePd 나노 점을 성공적으로 제작하였다. AFM를 이용하여 초기에 편평한 Fe/Au 이중층 박막이 온도가 증가함에 따라서 응집되어 나노 점 구조로 변형되는 것을 확인하였다. 또한 형성된 이중층위에 FePd 다층막을 $300^{\circ}C$, $350^{\circ}C$, $400^{\circ}C$, $450^{\circ}C$에서 각각 증착하였다. 초격자 구조를 갖는 FePd 다층막의 표면형상은 응집현상에 의하여 자기조립화된 이중층의 형상과 유사하였다. XRD 측정결과, $350^{\circ}C$ 이상에서 열처리된 FePd 다층막은 $L1_0$형 구조를 갖는다는 것을 확인하였다. 그리고 박막두께에 따른 XPS 측정결과는 전체 박막의 화학적 조성이 증착순서와 일치하는 것을 보여주었다. 결과적으로 추가적인 식각공정 없이 화학적으로 규칙화된 FePd 초격자 나노 점의 제작에 성공하였다. [ $L1_0$ ]phase FePd nano-dot structures were successfully fabricated on self-organized Fe/Au bilayers. With atomic force microscopy, it is determined that surface morphologies of initially flat Fe/Au bilayer films were agglomerated and transformed their shape into nano-dots structures with increasing annealing temperature. With this bilayer as a template, FePd multilayers were deposited at various temperatures, i.e. $300^{\circ}C$, $350^{\circ}C$, $400^{\circ}C$, and $450^{\circ}C$. Surface morphologies of FePd superlattice had a near resemblance to self-organized bilayer. According to X-ray diffraction results, it is confirmed that $L1_0$ superlattice structures of FePd were obtained from samples which were annealed above $350^{\circ}C$. Results of X-ray photoelectron spectroscopy depth-profile analysis showed that chemical composition is identical to deposition sequence. As a result, without additional etching processes, fabrication of chemically ordered FePd superlattice nano-dots was achieved.
강준구(J. G. Kang),정인식(I. S. Chung),구정우(J. W. Koo),고중혁(J. H. Koh),구상모(S. M. Koo),남송민(S. M. Nam),하재근(J. G. Ha) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.5
Epitaxial L1? FePd (001) thin films were successfully manufactured by sputtering deposition method. The structure and magnetic properties of FePd thin films were characterized as a function of Fe compositions. It was found that the long-range ordering parameter had a maximum for the stoichiometric composition, whereas the magnetic anisotropy had a maximum as the Fe content is decreased to slightly above the stoichiometric composition. This indicates that the stoichiometry is directly contributed to the chemical ordering and the magnetic anisotropy. These results imply that nonstoichiometric FePd compositions, with a slight excess of Pd, may in fact be preferred for applications that require high magnetic anisotropy.
함정 탑재장비용 능동 하이브리드 마운트 개발에 대한 연구
문석준(Moon, S.J.),최상민(Choi, S.M.),정종안(Jeong, J.A.),최승복(Choi, S.B.),정우진(Jung, W.J.),구자용(Koo, J.Y.) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.7
A hybrid mount for shipboard machinery installed on naval ships was developed. The mount is combined with a rubber mount and a piezostack actuator. The rubber mount is one of the most popular and effective passive mounts to have been applied to various vibration systems to date. The piezostack actuator is featured by a fast response time, small displacement and low power consumption. Through a series of experimental tests conducted in accordance with MIL-M-17185A(SHIPS), MIL-M-17508F(SH), and MIL-S-901D which are US military specifications related to the performance requirements of the mount, it has been confirmed that the hybrid mount shows more effective performance for use in naval ships.