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윤경석 한국부식학회 1979 Corrosion Science and Technology Vol.8 No.2
In this special lecture, one aspect of a new research front is reviewed concentrating on the specific electrochemical reaction which involves the photocatalytic decomposition of water. The system employs the abundant resources, water and solor energy, and produces an extremely important and clean fuel, hydrogen. The principles and problems of the system using semiconductor electrodes are discussed.
Nine-Level Inverter Based on Switched-Capacitor Structure with Single Source
윤경석,문은아 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.4
This paper discusses a new configuration of the switched-capacitor multilevel inverter (SCMI). Similar to conventional multilevel inverters, the features of the proposed SCMI are the same with the multilevel inverters but uses less number of active switches than the other multilevel inverters have the same number of levels output voltage. As a result, the cost and size of the system are reduced compared to the previous configurations. In the proposed topology, the capacitor voltage can be self-balance without using any auxiliary circuit. By using the capacitor, the output voltage is stepped up from the input voltage and without employing transformer. To verify the operation principle, PSIM simulation is performed for 9-level configuration. The experimental results are also shown with 9-level inverter configuration.
윤경석,이장용,김태호,유덕만,서동완,홍성권,홍영택 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Densely sulfonated polyketones (sPK-m) based on poly(p-phenylene)s were successfully synthesized through Ni(0)-catalyzed cross coupling reaction for polymer electrolyte membrane fuel cell (PEMFC) application. sPK-m membranes exhibited proton conductivities comparable to or better than that of Nafion 212 in the hydrate state. sPK-12.5 and sPK-15 membranes showed outstanding PEM fuel cell performance at 80 ℃ under 100% RH. In particular, sPK-15 membranes exhibited very high current density (around 1300 mA/cm2 at 0.6 V). Among the synthesized polymers, sPK-12.5 showed reasonable dimensional change and morphological property. Furthermore, proton conductivity and cell performance comparable to those of Nafion 212 membrane were obtained.