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윤종호,이재종,이응숙,이동주,김영호 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
Electro-rheological fluid is recently used for the micro polishing of 3-dimensional micro-aspherical lens. It's also used for polishing small area defects on the wide flat wafer. Since ER fluid shows a behavior of viscosity changing under certain electric fields, micro polishing efficiency may be enhanced for certain cases. In this paper, a perfluorinated carbonyl fluoride oil based ER fluids was used to improve surface polishing rate and submicron-scale accuracy. As the polishing electrodes, micro size cylindrical tools had been used for maximizing the electric field. An experimental device, which was applied for micro polishing a number of wafers of 4 inches in size and other workpieces, was made on a precision polishing system. It consisted of a steel electrode, a wafer fixture, 10mA current and DC 5kV power supply unit, and a controller unit. From the Experiments, the ER fluid is applicable for micro polishing of small parts.
시각 동기된 다중 양방향 TMDS 데이터 전송기능을 갖는 IED용 TSMB 버스 시스템의 구현 및 성능분석
윤종호,황병창,민병기,김동준 대한전기학회 2023 전기학회논문지 Vol.72 No.1
In this paper, we propose a novel TSMB bus system with multiple bidirectional data transmission and time synchronization capability for IEDs(Intelligent Electronic Devices). Unlike the legacy unidirectional TMDS(Transition Minimized Differential Signaling) used for transfer digital video signals, the proposed bus system employs dual high-speed serial TMDS link for sending trigger signals from the FPGA of main processor module and receiving the sampled data from submodules such as either current or potential transformers. For simultaneous triggering multiple submdoules, we also employ the precision timing protocol processing capability in the main processor, which generates the wall clock pulse per second(PPS) synchronized to GPS. Adopting PLL for the PPS signal, we can provide the reference clock of 98.304MHz for supporting the data rate of 491.52 Mbps over each TMDS link. The data rate can support eight 24 bits ADCs for PTs or CTs in the single link, each of which requires 4800 samplings per second. An implemented TSMB bus system with FPGA consists of a single main processor with clock expander and eight submodules, in which each submodule is connected with the bidirectional TMDS link to the FPGA of main processor module. The jitter of 1 PPS between the two main processor modules was measured to be less than 102nsec at the maximum, and the jitter of the TSMB transmission data line was measured to be less than or equal to 660ps at the TP3 point of the receiving side, confirming that the TMDS specification was satisfied. Finally, the proposed time- synchronized multi-directional bus system can contribute to the improvement of the reliability and performance of the algorithm of the intelligent protection relay system through the optimal transmission of equivalent and simultaneous sampling data without the involvement of the processor.
주택 지붕일체형 PV시스템 후면환기에 따른 발전성능 변화 실험연구
윤종호,한규복,안영섭 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.3
Building integrated photovoltaic(BIPV) system operates as a multi-functional building construction material. They not only produce electricity, but also are building integral components such as facade, roof, window and shading device. As PV modules function like building envelope in BIPV, combined thermal and PV performance should be simultaneously evaluated. This study is to establish basic information for designing effective BIPV by discovering relations between temperature and generation capability through experiment when the PV module is used as roof material for houses. To do so, we established 3kW full scale mock-up model with real size house and attached an PV array by cutting in half. This is to assess temperature influence depending on whether there is a ventilation on the rear side of PV module or not.