| 2024 | IECON | Actual Circuit Verification of LC Series Resonant Converter with Power Factor Control for Effective Power in Load regulation. | Akito Nakagaki, Eiji Hiraki, Kazuhiro Umetani, Masataka Ishihara, Yuto Yoshimura |
| 2021 | IECON | Parasitic Inductance Design for Preventing Oscillatory False Triggering of Parallel-Connected GaN-FETs. | Yusuke Hatakenaka, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki, Hiroshi Tadano |
| 2021 | IECON | Tiny Approaches to the Interactive Online Lectures Under the COVID-19 Pandemic. | Eiji Hiraki, Masataka Ishihara, Kazuhiro Umetani |
| 2021 | IECON | Cooperation between Theoretical and Practical Education through Power Electronics Circuits. | Taichi Kawakami, Kazuhiro Umetani, Shigeo Morimoto |
| 2020 | IECON | Competition-Based Learning of Power Converter Design Emulating Product Development Activity. | Kazuhiro Umetani, Eiji Hiraki |
| 2018 | IECON | Soft-Switching Control Circuit Based on Traveling and Reflected Waves for High-Frequency Resonant Inverter Applicable to Capacitive Load Impedance. | Aoi Oyane, Koji Itakura, Kazuhiro Umetani, Eiji Hiraki, Tatsuya Ikenari, Shingo Kawano |
| 2018 | IECON | Improved Thin Heating Coil Structure of Copper Foil Feasible for Induction Cookers. | Kazuhiro Umetani, Tomohiro Mishima, Eiji Hiraki, Takayuki Hirokawa, Makoto Imai, Hideki Sadakata |
| 2017 | IECON | Soft-switching technique applicable to capacitive load for resonant inverter of plasma generator. | Koji Itakura, Hiroaki Kakemizu, Hiroki Nakaido, Kazuhiro Umetani, Eiji Hiraki, Tatsuya Ikenari, Shingo Kawano |
| 2017 | IECON | Compact three-phase AC inductor network for PFC converter using magnetic coupled technique. | Takuya Ozaki, Hiroki Nakaido, Kazuhiro Umetani, Eiji Hiraki, Tatsuya Ikenari, Shingo Kawano |
| 2016 | IECON | Simple control technique to eliminate source current ripple and torque ripple of switched reluctance motors for electric vehicle propulsion. | Takayuki Kusumi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki |
| 2016 | IECON | Copper loss analysis based on extremum co-energy principle for high frequency forward transformers with parallel-connected windings. | Tomohide Shirakawa, Genki Yamasaki, Kazuhiro Umetani, Eiji Hiraki |