著者

齋藤 一雄 伊東 良 桑森 真介

出版者

日本武道学会

雑誌

武道学研究 (ISSN:02879700)

巻号頁・発行日

vol.45, no.2, pp.109-117, 2012-12-25 (Released:2014-04-04)

参考文献数

23

---

The aim of this study was to clarify the effects of the expansion of the dohyo (the ring in which sumo bouts are performed) on the winning percentage for a lighter wrestler, the number of kimarite (the winning techniques in a sumo bout) and the competitive time. Forty-four pairs of collegiate sumo wrestlers, 21 pairs with a large weight difference (above 10 %) and 23 pairs with a small weight difference (below 10 %), performed 10 bouts of sumo in both a standard dohyo (diameter: 4.55 m) and an expanded dohyo (diameter: 4.85 m). We evaluated the winning number for a lighter wrestler, the number of kimarite and the competitive time in the 10 bouts.The following results were obtained.1) The winning number for a lighter wrestler was 4.67 ± 1.35 (average ± SD) bouts in the standard dohyo and 5.52 ± 1.33 bouts in the expanded dohyo (significant difference, P < 0.01) among the pairs with a large weight difference. On the other hand, the winning number was 4.91 ± 1.70 bouts in the standard dohyo and 5.30 ± 1.72 bouts in the expanded dohyo (NS: no significant difference) among the pairs with a small weight difference.2) The number of kimarite was 4.90 ± 1.14 te in the standard dohyo and 4.95 ± 1.28 te in the expanded dohyo (NS) among the pairs with a large weight difference. The number was 4.00 ± 1.04 te in the standard dohyo and 4.61 ± 1.56 te in the expanded dohyo (NS) among the pairs with a small weight difference.3) The competitive time was 8.67 ± 3.95 s in the standard dohyo and 8.80 ± 3.09 s in the expanded dohyo (NS) among the pairs with a large weight difference. The time was 8.47 ± 3.28 s in the standard dohyo and 8.92 ± 3.06 s in the expanded dohyo (NS) among the pairs with a small weight difference.These results suggest that the expansion of the dohyo (from 4.55 m to 4.85 m of the diameter) increases the winning percentage for a lighter wrestler when the weight difference of a pair is above 10 %, but there is little affect when the weight difference of a pair is below 10 %.

著者

井野 博満 上澤 千尋 伊東 良徳

出版者

日本金属学会

雑誌

日本金屬學會誌 = Journal of the Japan Institute of Metals (ISSN:00214876)

巻号頁・発行日

vol.72, no.4, pp.261-267, 2008-04-01

著者

熊谷 正朗 赤松 和禎 伊藤 賢 伊東 良 今津 拓馬 小形 知正 玉田 薫

出版者

一般社団法人日本機械学会

雑誌

ロボティクス・メカトロニクス講演会講演概要集

巻号頁・発行日

vol.2005, 2005-06-09

被引用文献数

1

著者

井野 博満 上澤 千尋 伊東 良徳

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.72, no.4, pp.261-267, 2008 (Released:2008-04-01)

参考文献数

12

被引用文献数

1 1

---

Surveillance data for pressure vessel steels of the 51 LWR plants in Japan were analyzed to make clear the effect of neutron irradiation on the brittle transition temperature of the steels. The clear difference observed in the rise of the ductile to brittle transition temperature between the normal and accelerated irradiation samples is considered to be due to the effect of neutron flux. The present analysis is discussed in comparison with the result of computer simulation based on the rate equations of the radiation damage process and the recent experiments of APFIM and positron annihilation.

著者

熊谷 孝幸 伊東 良太 竹家 啓 久保 等 吉田 浩之 藤井 彰彦 能勢 敏明 尾崎 雅則 斗内 政吉

出版者

一般社団法人 日本液晶学会

雑誌

日本液晶学会討論会講演予稿集 2009年 日本液晶学会討論会 (ISSN:18803490)

巻号頁・発行日

pp.189, 2009 (Released:2011-04-01)

---

本研究では、テラヘルツ帯にストップバンドを持つような一次元フォトニック結晶にネマティック液晶を導入することでテラヘルツ波スイッチング素子の実現を試みた。無水合成石英と空気からなる一次元フォトニック結晶中に液晶欠陥層を導入した構造を作製し、テラヘルツ帯において液晶欠陥に起因する欠陥モードピークの発現を確認した。更に液晶の配向を制御することで、屈折率異方性を用いて欠陥モードピークが発現する周波数の制御を試みた。