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평판형 AWG 기술을 이용한 광대역 파장다중화/역다중화 소자의 제작 및 특성
문형명,곽승찬,홍진영,이길현,김동훈,김종진,최상열,이정길,이지훈,임기건,김진봉,Moon, H.M.,Kwak, S.C.,Hong, J.Y.,Lee, K.H.,Kim, D.H.,Kim, J.J.,Choi, S.Y.,Lee, J.G.,Lee, J.H.,Lim, K.G.,Kim, J.B. 한국광학회 2007 한국광학회지 Vol.18 No.3
평판형 AWG(Arrayed Waveguide Grating) 기술을 이용한 새로운 CWDM(Coarse Wavelength Division Multiplexer) 소자의 제작기술을 제안한다. 슬랩 도파로 입력단에 나팔형태를 갖는 도파로에 대하여 광전파방법(BPM)에 의한 전산모사 결과와 투과대역이 평탄화된 20 nm 간격의 CWDM 소자의 제작 결과를 보고한다. $0.75{\triangle}%$의 박막을 사용하였으며, 소자의 삽입손실은 가우시안 형태에 대하여 3.5 dB와 평탄화된 형태에 대하여 4.8 dB를 각각 얻었으며, 3 dB 대역폭은 각각 10 nm 및 13 nm 이상의 결과를 얻었다. A novel technology for CWDM (Coarse Wavelength Division Multiplexer) utilizing a PLC (Planar Lightwave Circuit)-AWG (Arrayed Waveguide Grating) fabrication process is proposed. BPM (Beam Propagation Method) Simulation results on the employed parabolic-horn-type input slab waveguide of AWG and the performance of the 20 nm-channel spacing CWDM with flattened passband are presented. Waveguides of $0.75{\triangle}%$ have been used in this experiment and the insertion loss at the peak wavelength is 3.5 dB for a Gaussian spectrum and is 4.8 dB for a flat-top spectrum. The bandwidth at 3 dB is better than 10 nm and 13 nm for Gaussian and flat-top spectra, respectively.
문정주(J. J. Moon),서성진(S. J. Seo),김광용(K. Y. Kim) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
Three-dimensional flow through a tubular centrifugal fan with airfoil type blades are analyzed using CFX-TASCflow. Standard k - ε model and k - ω model are used as turbulence closures. The numerical schemes for convetion terms, i.e., Upwind Differencing Scheme(UDS), Mass Weighted Skewed Upstream Differencing Scheme(MWS), Linear Profile Skewed Upstream Differencing Scheme(LPS), and Modified Linear Profile Skewed Upstream Differencing Scheme(MLPS) are also tested. And, the performance of these schemes coupled with two turbulence models are evaluated. Computational static pressure distributions are compared with experimental data obtained in this work.
공기스프링과 압전작동기를 결합한 복합형 미진동 방진마운트 시스템 개발
문석준(Moon, S.J.),정형조(Jung, H.J.),신윤호(Shin, Y.H.),장동두(Jang, D.D.),정종안(Jeong, J.A.),문영종(Moon, Y.J.) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.1
A new hybrid mount system is proposed for microvibration control in a high-tech factory. The mount consists of an airspring as a passive device and a piezostack actuator as an active device. The two devices are connected in series. Some numerical simulations and experimental tests are carried out to evaluate isolation performance of the mount system comprising of four proposed hybrid mounts. As a control logic, the specific algorithm is adopted for considering multiple target frequencies of excitation based on a Filtered-X LMS algorithm. The results are compared with isolation performance of the passive airspring mount system. It is confirmed that the proposed hybrid mount system has great performance on microvibration.