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김병찬,박상택,강경옥,Kim, B.C.,Park, S.T.,Kang, K.O. 한국전자통신연구원 2017 전자통신동향분석 Vol.32 No.6
The frequency range of a radio wave is from 3kHz to 300GHz, and radio technologies use this range to improve the quality of human lives. Radio technologies have entered a new phase of communication. The core infrastructure used as the basis for technologies leading the fourth industrial evolution, such as artificial intelligence, the Internet of Things, autonomous cars/drones, augmented reality, robots, and remote medical diagnoses, is the 5G network. The 5G network enables transmitting and receiving large amounts of data at very high speed. In particular, application technologies with artificial intelligence have been studied, including radar, wireless charging, electromagnetic devices and their effects on humans, EMI/EMC, and microwave imaging. In this study, we present a future radio technology that is needed to prepare for the upcoming industrial revolution and digital transformation.
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.
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.