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김주완(Juwan Kim),장인성(Insung Jang) 대한공간정보학회 2021 한국공간정보학회 학술대회 Vol.2021 No.11
스마트시티, 디지털트윈 등 실감형 3D 도시모델에 대한 수요가 증가하면서, UAV 기반 고품질 항공 영상에 대한 요구가 커지고 있다. 그러나, 도심지 영상에 포함된 건물 그림자는 영상 처리, 시뮬레이션 등의 활용 과정에서 장애 요소로 작용하고 있다. 본 연구는 UAV로 촬영한 도심지 항공 영상에 있는 그림자를 딥러닝으로 제거하여 화질을 개선하는 방법을 제안한다. 제안 방법은 개선된 이중 계층적 그림자 제거 인공신경망을 기반으로 다양한 실세계 환경에 강건한 그림자 제거 성능을 확보하기 위하여 물리적 조명 모델을 활용한 도메인 랜덤화 기법을 적용하였다. 공개된 학습 데이타를 이용하여 성능 평가를 실시하였으며, 실제 드론 촬영 영상에 적용하여 그림자 영역의 화질이 개선된 결과를 제시한다.
MR fluid jet polishing system의 비구면 렌즈 금형 코어 연마를 위한 경로
김기범(K. B. Kim),조명우(M. W. Cho),하석재(S. J. Ha),조용규(Y. K. Cho),이정원(J. W. Lee) 한국소성가공학회 2015 금형가공 심포지엄 Vol.2015 No.8
MR fluid can be changed viscosity through magnetic flied and that characteristic reduce scattering of jetting fluid. From this reason MR fluid jet polishing system can carry out ultra-precision polishing. In this paper we calculate path considering aspherical lens profile equation and experimental conditions of MR fluid jet polishing system. And then we polished aspherical lens mold core using MR fluid jet polishing system through path control and compare results before and after polishing process.
MR polishing 적용을 위한 CI particle 크기에 따른 MR fluids의 유변학적 특성 분석
홍광표(K. P. Hong),이정원(J. W. Lee),하석재(S. J. Ha),조용규(Y. K. Cho),조명우(M. W. Cho),제태진(T. J. Je) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
MR (magnetorheological) fluids have been used to ultra-precision polishing optical glass and/or mold metal materials MR fluids were composed with CI particles (magnetic particle), DI water (carrier fluid), Na₂CO₃, Glycerin (stabilizer). In this study, the rheological properties of MR fluids which nano CI particles are dispersed were considered to compare the effects of micro sized CI particles, and MR polishing experiments were performed to evaluate the polishing properties of two types MR fluids. MR fluids based on two types of CI particle with different average size, 3.5㎛, 300㎚, were prepared. SEM, particle analyzer, and rheometer were utilized to investigate their rheological properties Sedimentations of MR fluids were measured to investigate the effects of dispersion stability. Finally, it was obtained the rheological properties (viscosity, shear stress, sedimentation) of MR fluid with larger particle size.
알루미늄 표면 전처리에 따른 양극 산화 효과에 관한 연구
김기범(K. B. Kim),하석재(S. J. Ha),조명우(M. W. Cho),조용규(Y. K. Cho),김병찬(B. C. Kim) 한국소성가공학회 2015 금형가공 심포지엄 Vol.2015 No.8
In industry field, anodizing process of aluminum is used for not only coloring but also increase hardness of surface. Anodized aluminum is mostly used for cover of personal electronic device like mobile phone, portable battery. It is because of aesthetic and weight lightening of products. Through anodizing process, nano scale pore is formed on aluminum surface. These pores are used for fabrication diffused reflective film of display panel and CNT(Carbon Nano Tube). Anodizing pores are influenced by purity, surface roughness of aluminum and experimental conditions. In this study, use film polishing system and MR polishing system for pre-process of aluminum. Film polishing system use abrasive film that similar to sandpaper. During polishing process abrasive film is exchanged sequentially through motorized roller. So can maintain uniform condition of abrasive that involved in polishing process. Also, film polishing system have vibration module that increase polishing efficiency. MR polishing system use MR fluid that is made of CI powder. Cl powder is magnetic particle, so MR fluid can be changed viscosity through magnetic field. To increase material removal ratio, we add abrasive particle during polishing process. Both film polishing and MR polishing is improve surface roughness, but MR polishing is better than film polishing in terms of surface roughness. After polishing process, we conduct anodizing process to both case. In case of anodizing pore, MR polishing aluminum is better than film polishing aluminum. As a result of anodizing process, we confirm pre-process conditions can effect on anodizing process and pore formation.