Kazuhiko Masumoto

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Recently, efficiency improvement has been noted with the rapidly increasing consumption of energy. The diode losses is the main cause of efficiency decrease in bridge rectifier of conventional PFC circuit, it can not be neglected. Therefore bridgeless PFC circuit has been focused. In this research, the various bridgeless PFC circuits are analyzed. The(More)
[1] The formation of lava tubes is one of the most significant factors controlling the emplacement of lava flows. However, extents and structures of lava tubes are typically not precisely known due to the difficulty in finding lava tubes in the field. We developed a new stepped-frequency ground penetrating radar (GPR) system with shielded antennas, which(More)
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