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김좌선(Jwasun Kim),변의현(Euihyeon Byeon),한윤아(Yun-ah Han),김석민(Seok-min Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
A method to fabricate bilayer wire grid polarizer (B-WGP) by nanoreplication and metal vapor deposition was proposed for a simpler and a less costlier fabrication method for the reflective polarizer. We fabricated B-WGP composed of UV-replicated 80nm pitch nanograting structure and E-beam evaporated 50㎚ thick aluminium layer. To examine the performance of the fabricated B-WGP structure, the transmission spectra of TE- and TM- polarized light, and the extinction ratio spectra were measured and compared with the simulated spectra.
서석민(Seok Min Seo),김명태(Myeong Tae Kim) 한국가구학회 2012 한국가구학회지 Vol.23 No.3
Geomancy accepts with a pre-requisite that human beings adapt themselves to nature as an organism, because people and environment, bodies and space have the homogeneity which can not be divided by a dichotomy. The homogeneity as a structure alive implies a deep relationship with biorhythm and the change of space, and is regarded as a concept and role significant on the coordination. In other words, applying the element in the geomancy could be interpreted as a work giving a new meaning and spirit on a creation of space and furniture coordination. Harmony and balance shown in design concepts have a relationship with the meaning on Yin-Yang and the Five Elements theory. In addition, the characteristic in each element is suggested as an example applying the concept of geomancy through furniture coordination for each space in the chapter 4.
Cascaded 멀티레벨 인버터의 고장 허용 제어를 위한 Level-Shifted PWM 기반의 새로운 변조 기법
김석민(Seok-Min Kim),이준석(June-Seok Lee),이교범(Kyo-Beum Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.5
This paper proposes a novel level-shifted PWM (LS-PWM) strategy for fault tolerant cascaded multilevel inverter. Most proposed fault-tolerant operation methods in many of studies are based on a phase-shifted PWM (PS-PWM) method. To apply these methods to multilevel inverter systems using LS-PWM, two additional steps will be implemented. During the occurrence of a single-inverter-cell fault, the carrier bands scheme is reconfigured and modulation levels of inverter cells are reassigned in this proposed fault-tolerant operation. The proposed strategy performs balanced three-phase line-to-line voltages and line currents when a switching device fault occurs in a cascaded multilevel inverter using LS-PWM. Simulation and experimental results are included in the paper to verify the proposed method.
배열회수보일러 케이싱 파손방지를 위한 열응력 저감 Heat Sink 설치 효과
최석민(Seok Min Choi),김선호(Seon Ho Kim),김풍일(Poongil Kim),고석재(Seok Jae Ko),정희봉(Hee Bong Chung),한봉기(Bong Gi Han),조형희(Hyung Hee Cho) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This study investigate thermal stress on the HRSG casing adopting heat sink by experimental data and numerical simulation. Heat sink is adopted on the HRSG casing to reduce the thermal stress. Thermocouples are installed on the operating HRSG casing to measure the temperature. Measured data shows that temperature gradient is rapid on the middle section of the HRSG casing. On the middle section, the temperature gradient is average 100℃ and it will cause extreme thermal stress. By numerical simulation we found out the local temperature data and measeared the thermal stress on the HRSG casing. Thermal stress on the middle section of HRSG casing is the highest and we can easily assume that the breakages are frequently happens on that position. So, we installed the heat sink on the vulnerable position on the HRSG casing to reduce the thermal stress. By installing the heat sink, we can reduce the peak thermal stress by 10% on the vulnerable position. As a result, heat sink can reduce the thermal stress on the HRSG casing.