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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.
MR fluid 폴리싱 공정에서의 요인분석법을 이용한 재료제거율 향상을 위한 공정 인자 도출에 관한 연구
김병찬(B. C. Kim),하석재(S. J. Ha),조용규(Y. K. Cho),송기혁(K. H. Song),조명우(M. W. Cho) 한국소성가공학회 2015 금형가공 심포지엄 Vol.2015 No.8
In these days, micro grinding and ELID(electronic in-process dressing) are used in producing special mirror made of brittle materials. However, micro crack, work hardening of residual stress could be created by high grinding energy in these process. MR fluid polishing is indirect grinding process and used by MR fluid that is changed in magnetic field. It can eliminate micro crack on the surface of material and minimize subsurface damage. In this paper, operating condition for material removal rate of MR fluid polishing is analyzed using factor analysis for aluminum alloy. In the experiments, the factor of experiments are wheel speed, polishing depth, magnetic field, polishing time and concentration of CI power in MR fluid. From the result of experiments using factor analysis, material removal rate of MR fluid polishing depends on magnetic field, polishing depth, polishing time. On the other hand, wheel speed and concentration of CI power cannot affect material removal rate. Through these results, the electromagnetic is new-designed and performed analysis of magnetic flux density.
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.