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김범욱,전호석,박철현 한국자원공학회 2020 한국자원공학회지 Vol.57 No.1
Magnetic separation, which has been widely used in various industries (e.g., mineral and waste treatment) is an important part of mineral processing. In this study, the simulations of particle trajectories and the relationships between the main parameters in a dry belt-type magnetic separation system are presented. The magnetic field strength simulated by finite element analysis depended upon the vertical distance; the maximum strength was formed at a 0.31 m along the x-axis from a permanent magnet. Simulations of particle trajectories were conducted on ferromagnetic (magnetite), paramagnetic (ilmenite), and diamagnetic (quartz) materials, with variable parameters such as magnetic field strength, particle size, and degree of liberation. The simulation results showed that the key factors of magnetic susceptibility and field strength considerably affected the particle trajectory, as compared with particle size and specific gravity. Hence, the minimum magnetic field strength needed to separate magnetite and ilmenite could be obtained by the regression equation 자력선별법은 광물 및 폐기물 등 다양한 산업에서 활용되고 있는 광물처리의 중요한 분야이다. 본 논문에서는 건식벨트형 자력선별시스템에서 입자궤적을 모사하고 자력선별 주요변수간의 관계를 도출하고자 하였다. 자기장 모사는 유한요소해석 프로그램에 의해 수행되었고 주요 영향 변수는 수직이격 거리이었다. 최대 자기장세기는 영구자석로부터 X축의 0.31 m 지점에서 형성되었다. 입자궤적모사는 강자성(자철석), 상자성(티탄철석) 및 반자성(석영) 물질에 대해 자기장세기, 입자크기 및 단체분리도의 조건변화에 따라 수행되었다. 모사결과, 입자크기와 비중에비해 자화율과 자기장세기가 입자궤적에 영향을 미치는 주요 변수임을 확인하였다. 이로부터 자철석과 티탄철석을선별하기 위한 최소 자기장의 세기가 회귀식에 의해 도출되었다.
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김범욱,박철현,Kim, Beom-uk,Park, Chul-hyun 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.6
Automobile shredder residue (ASR) is the final waste produced when end-of-life vehicles (ELVs) are shredded. ASR can be separated using mineral-processing operations such as comminution, air classification, magnetic separation, and/or electrostatic separation. In this work, trajectory analyses of conductors (copper) and non-conductors (glass) in the ASR have been carried out using induction electrostatic separator for predicting or improving the ASR-separation efficiency. From results of trajectory analysis for conductors, the trajectories of copper wire by observation versus simulation for coarse particles of 0.5 and 0.25 mm showed consistent congruity. The observed 0.06 mm fine-particles trajectory was deflected toward the (-) attractive electrode owing to the charge-density effects due to the particle characteristics and relative humidity. In the case of non-conductors, the actual trajectory of dielectric glass deflected toward the (-) electrode, showing characteristics similar to those of conductive particles. The analyses of stereoscopic microscope and SEM & EDS found heterologous materials (fine ferrous particles and conductive organics) on the glass surface. This demonstrates the glass decreasing separation efficiency for non-ferrous metals during electrostatic separation for the recycling of ASR. Future work will require a pretreatment process for eliminating impurities from the glass and advanced trajectory-simulation processes.
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SEAMLESS HANDOVER between HETEROGENEOUS NETWORK (Comparison MIH, UMA)
BumWook Kim(김범욱),JooSeok Song(송주석) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.2
A lots of different networks are developed in these days such as cellular networks (2G, 3G, 3G+), WiBRo, WiMax, Bluetooth, HSDPA and so on. And now we are prepare to the next generation, 4G. As heterogeneous networks are appeared, we have to prepare the general handover protocol. There are many handover protocols developed for between two specific network, but it is not insufficient to combine each network. Handover for heterogeneous network is developed nowadays. We can say that main handover protocols for heterogeneous network are MIH and UMA. In this paper, MIH and UMA will be covered. Each handover protocols are discussed. In detail, structures, handover working architecture, and preparation for each network protocols. Second, comparation of each handover protocols and which protocol is more efficient in specific situations will be discussed. Third, the direction of the MIH will be shown.
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