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서용범(Yong-beom Seo),강현일(Hyun-il Kang) 대한전기학회 2016 전기학회논문지 P Vol.65 No.1
EMC (Electro Magnetic Compatibility) of the electrical railway must be ensured for safety of passenger. Maglev trains has not friction between the wheels and the rails because levitation by an permanent magnets, electromagnets and superconducting magnets etc. So, it is advantageous to maintain a high speed without noise and vibrations. In this paper, we investigated that the magnetic field of the before and after installation electromagnetic waves absorber in order to analyze the effects of electromagnetic waves. The theoretical analysis of the electromagnetic wave absorber was simulated using finite element method. The magnetic field properties of electromagnetic waves absorber were measured by EMI (Electro Magnetic Interference) test receiver.
와전류탐상에 의한 미세혈관 문합용 마이크로링-핀시스템(AnaFix<SUP>®</SUP>)의 자기장민감성 및 전기전도도 평가
박천웅(Cheon-Woong Park),서용범(Yong-Beom Seo),지대원(Dae-Won Jee),양영규(Young-Gyu Yang),김철웅(Cheol-Woong Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Automated devices for microvascular anastomoses are more frequently used lately and the Microvascular Anastomotic Coupler (MAC) System is widely known for its clinically proven ring-pin system. In this study, we also developed a new anastomotic coupler system, AnaFix<SUP>®</SUP>, for secure end-to-end anastomoses. The coupler system consists of two rings and six pins inserted for each ring. Titanium Ti-6Al-4V and HDPE (High Density Polyethylene) are commonly used for micro-sized rings and pins, respectively, due to its bio-compatibility as well as accurate and consistent anastomoses. However, the pins produced by Ti-6Al-4V, which would be permanently implemented, can cause non-uniformity in MRI images by interfering them as artifacts. Therefore, it is necessary to evaluate electric current density, magnetic field sensitivity and electrical conductivity of the Ti-6Al-4V pins in human body to prevent the image distortions created by them. For the study, we performed the following simulations. 1) Calculation of electric current density from the pins in a 1T~4T(Telsa) magnetic field. 2) Evaluation of electrical conductivity of the electric current density. 3) Verification of magnetic susceptibility with comparative displacement of the pins.
Cheon-Woong Park(박천웅),Yong-Beom Seo(서용범),Un-Shob Shim(심은섭),Cheol-Woong Kim(김철웅) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The possibilities and limitations of eddy current methods for the inspection of carbon fiber-reinforced plastics have been investigated. The present investigation was undertaken to gain a better understanding of the possibilities and the limitations of eddy current methods for the inspection of CFRP tube. The main objective of this study is to evaluate the investigation of ECT for the inspection of defects containing saw-cut and circular hole in CFRP tube using the LeSATA<SUP>TM</SUP>. This research was carried out to characterize the ECT effect on the defect-shapes such as the saw-cut and the hole ones of CFRP tube and on the ratio of the defect-depth (20%, 40%, 60%, 80%, and 100% depth to the thickness of CFRP tube) and conclusions were obtained. 1) For the self-manufactured CFRP tube, the inspection of the defect between 100Hz and 1kHz was not possible and it had nothing to do with the defect-shape. The high frequency such as 100kHz~500 kHz made the inspection of defects possible. 2) The different 3-D pictures was obtained by the direction of axial and circumferential saw-cuts that have the same shape. The fact that both the sum of magnetic vector potential and the interference components were considered for the circumferential one, made them exaggerated. 3) While the depth of the defect was increasing, the phase angle was lowering and the amplitude of EC was gradually increasing. Therefore, while the lower amplitude of EC made the permeable depth of the signal deeper, it made the sensitivity of the defect lower.