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The Development of a Power System of the Combination of Diesel Generator and UPS
Dawei Qiu,Satoshi Uda,Hironori Kashihara,Yuki Fukuda,Naoya Okazaki,Shoji Nishimura,Yoshinori Kawasaki 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper shows the development of a power supply system to solve the anomalous voltage sag, power failure and peak cut demand. This power supply system includes an UPS (Uninterruptible Power Supply), a standby generator and a Hybrid Switch, which is the integration of mechanical switches and IGBTs with good performance of low conducting loss and fast opening time. The results of a real-time simulation demonstrate its voltage compensation can perform within 2 ms response time when power failure occurs and transfer without voltage down between micro grid operation and gird-connected operation. Also, they are successfully validated by using a prototype system.
Melvin John F. Empizo,Kohei Yamanoi,Kazuhito Fukuda,Ren Arita,Yuki Minami,Toshihiko Shimizu,Nobuhiko Sarukura,Tsuguo Fukuda,Alexandra B. Santos-Putungan,Ray M. Vargas,Arnel A. Salvador,Roland V. Sarma 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Photoluminescence properties of bulk and microstructured ZnO crystals are investigated for potential scintillator applications. A bulk crystal is prepared by hydrothermal method, while hexagonal micron-sized crystals are prepared by aqueous chemical growth and carbothermal reduction methods. The bulk sample exhibits UV emission only, while the microstructured samples exhibit both UV and visible emissions. The ZnO microstructures have faster near-band edge emission lifetimes of 100 to 800 ps compared to 440 ps and 2 ns of bulk ZnO. No direct correlation between the defect-related emissions and the near-band edge emission has been observed. ZnO microstructures with fast luminescence lifetimes have promising applications as EUV lithography and XFELs scintillators.