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Publication
Featured researches published by Toshiro Hirai.
international telecommunications energy conference | 2000
Toshiro Hirai; Y. Shikano; Kaoru Asakura; Makoto Shimomura; Harumi Hasui; I. Yamada
The authors have developed a nickel-metal hydride (Ni/MH) battery that has a lifetime of eight years at 30/spl deg/C and operates at temperatures from -10/spl deg/C to 55/spl deg/C. This performance was achieved by improving the Ni/MH cells and optimizing their charging. Optimizing the metal-hydride and electrolyte contents of the Ni/MH cells extended cell lifetime from one to two years. Use of an intermittent current-pulse charging method that inhibits cell degradation due to overcharging extended cell lifetime to three times that of cells charged using trickle-charging. Use of an optimum intermittent charging condition allows four batteries to be charged sufficiently at the current needed to fully charge only one battery. This battery has been used as the backup power source in optical network units (ONUs) of Fiber-To-The-Home (FTTH) networks and in the HUB power supplies of Fiber-To-The-Pole (FTTP) networks.
Archive | 2001
Kaoru Asakura; Toshiro Hirai
Archive | 2001
Toshiro Hirai; Akihiko Matsuda; Kazutaka Sakurai; Noboru Suekuni; Hirofumi Takahashi; Tadashi Tamura; Kiyoshi Tsutsui; Tsuneo Uekusa; 敏郎 平井; 明彦 松田; 常雄 植草; 一貴 櫻井; 正 田村; 清志 筒井; 昇 陶国; 弘文 高橋
Archive | 2001
Toshiro Hirai; Tsuneo Uekusa; 敏郎 平井; 常雄 植草
Archive | 2001
Toshiro Hirai; Makoto Shiraha; Tsutomu Takeda; 敏郎 平井; 勉 武田; 真 白羽
Archive | 1999
Kaoru Asakura; Toshiro Hirai; Yukiyasu Kano; Akira Yamashita; 山下 明; 敏郎 平井; 薫 朝倉; 幸泰 鹿野
Archive | 2000
Kaoru Asakura; Toshiro Hirai; 敏郎 平井; 薫 朝倉
Archive | 2000
Kaoru Asakura; Toshiro Hirai; 敏郎 平井; 薫 朝倉
Archive | 2000
Kaoru Asakura; Toshiro Hirai; 敏郎 平井; 薫 朝倉
Archive | 2003
Toshiro Hirai; Katsuhiko Honjo; 敏郎 平井; 克彦 本庄
