著者

吉田 和人 山田 耕司 玉城 将 内藤 久士 加賀 勝

出版者

Japan Society of Physical Education, Health and Sport Sciences

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.59, no.1, pp.227-236, 2014

被引用文献数

4

---

The rotation speed of the ball spin has been considered a key factor in winning table tennis matches. This study quantified the rotation speed (rotations per second: rps) of service balls delivered by quarter-finalists in the 2009 World Table Tennis Championships. Ball services were recorded during the quarter-finals of both the men's and women's singles, involving 4 matches and 8 players per gender, using a high-speed video camera (1000 fps) for calculation of the rotation speed, and a standard video camera (30 fps) for distinguishing players and aces (including those touched by the receiver). Eventually, the rotation speeds of 329 services were calculated, and these ranged from 13.7 to 62.5 rps. For men, 50-60 rps was the most frequent (40.0%) range of the rotation speeds, while for women, the corresponding range was 40-50 rps (43.8%); the average (±SD) rotation speed was significantly greater for men than for women (46.0±9.0 vs. 39.2±9.3 rps, p<0.001). The fastest rotation speed was 62.5 rps for both genders. Chinese men produced a slower rotation speed than did other men (43.5±8.9 vs. 51.0±6.8 rps, p<0.001). For women, however, the rotation speed was similar between Chinese players and the others (39.9±10.2 vs. 38.5±8.2 rps). The rotation speeds of aces were scattered over a wide range of 37.0-58.8 rps for men and 27.8-62.5 rps for women, implying a weak association between aces and fast rotation. These pioneering data may help clarify some of the technical and tactical aspects of table tennis, and can be used to develop training and game strategies for successful performance.<br>

著者

吉田 和人 山田 耕司 玉城 将 内藤 久士 加賀 勝

出版者

日本コーチング学会

雑誌

コーチング学研究 (ISSN:21851646)

巻号頁・発行日

vol.28, no.1, pp.65-74, 2014-11-20 (Released:2019-09-02)

参考文献数

16

被引用文献数

1

---

A notational analysis of 12,428 rallies in 149 singles matches at the London Olympic Games was conducted to clarify the characteristics of world-class rallies in table tennis. The number of shots played per rally, which was the sum of a correct service and correct returns, was measured. And the winning ratios of server and receiver were determined by the number of shots played per rally (Odd numbers indicate the server won the point, even numbers indicate the receiver won the point). The playing styles of the players were classified into all-round types and defensive types (chopper type), and the types of matches were classified into 3 by the combination of playing styles as: all-rounder vs. all-rounder (AA type), all-rounder vs. defensive (AD type) and defensive vs. defensive (DD type). The numbers of shots and the two ratios, and relations to both gender and type of match were considered. The DD type was excluded from this analysis because there were too few measured data. As a result, the mode of the number of shots for men and women was 3 each. The maximums for men and women were 38 and 60, respectively. The minimum for men and women were 0 each. The mean number of shots for women was significantly larger than that for men for AD type (p<0.01), and that for AD type was significantly larger than that for AA type for both men (p<0.01) and women (p<0.001). The mean winning ratios for servers for both men and women for AA type and AD type were all at the same level at about 55%, which were significantly higher than those for receivers of about 45% (p<0.01). Additionally, the evaluation criteria for the mean number of shots in a match, and those for the winning ratios of a server and a receiver were proposed. It was suggested that these results could be valuable for table tennis coaching.

著者

中川 敬 羽間 鋭雄 三野 耕 後藤 幸弘 井関 敏之 山田 耕司 佐々木 美雄

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会号 第22回(1971) (ISSN:24330183)

巻号頁・発行日

pp.284, 1971-10-15 (Released:2017-08-25)

著者

小田 俊郎 井関 敏之 丹羽 健市 羽間 鋭雄 佐々木 美雄 近藤 達雄 藤田 一誠 山田 耕司 大谷 遷

出版者

日本体力医学会

雑誌

体力科學 (ISSN:0039906X)

巻号頁・発行日

vol.15, no.4, 1966-12-01

著者

三野 耕 井関 敏之 中川 敏 羽間 鋭雄 後藤 幸弘 山田 耕司 本間 聖康 脇田 正道

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会号 第28回(1977) (ISSN:24330183)

巻号頁・発行日

pp.309, 1977-10-12 (Released:2017-08-25)

著者

山田 耕司

出版者

九州教育学会

雑誌

九州教育学会研究紀要 (ISSN:02870622)

巻号頁・発行日

vol.34, pp.91-98, 2006

著者

今 純一 矢本 智之 山田 耕司

出版者

青森県農林総合研究センター林業試験場

雑誌

林業試験場報告 (ISSN:1349242X)

巻号頁・発行日

vol.2004, pp.7-23, 2004

---

昆虫多様性調査に適したトラップの選択と、その調査方法を明らかにするために、平成16年度は山地広葉樹林に黒色と白色の衝突板式トラップとマレーズトラップを設置して、捕獲された甲虫目及びカミキリムシ科の科や種及び個体数を調査した。その結果、カミキリムシでは、14・15年度に行った里山広葉樹林の調査でほとんど捕獲出来なかった山地を表徴する種が得られた。また、マレーズトラップを1林分に2基ずつ設定したところ、各トラップで捕獲できた甲虫の種数や個体数に非常に差があったことから、今後は林分内に複数基のマレーズトラップを設置して調査・検討することが望ましいものと思われた。トラップの使用方法について、カミキリムシ科のハナカミキリ亜科では、白色の衝突板トラップやマレーズトラップを使用し、5月中・下旬から梅雨入り前までの短期間調査することにより、林分ごとの種構成を把握することが可能と思われた。また、カミキリ亜科のトラカミキリ族も表徴的なグループであり、白色と黒色の衝突板トラップの併用が適しているものと思われたが、種構成を把握するためには、春期から夏期までの長期間の調査が必要である。

著者

吉田 和人 山田 耕司 玉城 将 池袋 晴彦 加賀 勝

出版者

日本スポーツ教育学会

雑誌

スポーツ教育学研究 (ISSN:09118845)

巻号頁・発行日

vol.34, no.1, pp.33-44, 2014-05-31 (Released:2014-09-29)

参考文献数

21

被引用文献数

1 1

---

The purpose of this study was to clarify practical knowledge of improving service skills to increase competitiveness level of table tennis players using sport sciences. The practice of sport science support has been ongoing for three years, focusing on players from 13 years to 18 years who belonged to the Japanese Olympic Committee elite academy team. Two experiments per year were conducted. A high-speed camera (1000Hz) was used to measure the rotation speed of the service ball and two normal speed cameras (30Hz) were used to measure players’ movements. A meeting was held on the day after each experiment to discuss the results, during which each player, his/her coach, and staff who analyzed the experimental data clarified the technical challenges for the player. 9 male players and 7 female players participated at least once in both the experiments and the meetings during the 3-year period. The main results were as follows. 1) Range of rotation speed for the male players’ services was from 35.7rps to 83.3rps, and that of the female players’ services was from 16.4rps to 66.7rps. No-spin services were not included in these

著者

山田 耕司 森本 茂雄 真田 雅之 武田 洋次

出版者

パワーエレクトロニクス学会

雑誌

パワーエレクトロニクス学会誌 (ISSN:13488538)

巻号頁・発行日

vol.31, pp.187-187, 2006-03-31 (Released:2010-03-12)

参考文献数

2

著者

吉田 和人 山田 耕司 玉城 将 内藤 久士 加賀 勝

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.13068, (Released:2014-04-21)

参考文献数

19

被引用文献数

6 4

---

The rotation speed of the ball spin has been considered a key factor in winning table tennis matches. This study quantified the rotation speed (rotations per second, rps) of service balls delivered by quarter-finalists in the 2009 World Table Tennis Championships. Ball services were recorded during the quarter-finals of both the men's and women's singles, involving 4 matches and 8 players per gender, using a high-speed video camera (1000 fps) for calculation of the rotation speed, and a standard video camera (30 fps) for distinguishing players and aces (including those touched by the receiver). Eventually, the rotation speeds of 329 services were calculated, and these ranged from 13.7 to 62.5 rps. For men, 50-60 rps was the most frequent (40.0%) range of the rotation speeds, while for women, the corresponding range was 40-50 rps (43.8%); the average (±SD) rotation speed was significantly greater for men than for women (46.0±9.0 vs. 39.2±9.3 rps, p<0.001). The fastest rotation speed was 62.5 rps for both genders. Chinese men produced a slower rotation speed than did other men (43.5±8.9 vs. 51.0±6.8 rps, p<0.001). For women, however, the rotation speed was similar between Chinese players and the others (39.9±10.2 vs. 38.5±8.2 rps). The rotation speeds of aces were scattered over a wide range of 37.0-58.8 rps for men and 27.8-62.5 rps for women, implying a weak association between aces and fast rotation. These pioneering data may help clarify some of the technical and tactical aspects of table tennis, and can be used to develop training and game strategies for successful performance.

著者

千田 二郎 山田 耕司 藤本 元 三木 英雄

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.53, no.485, pp.176-182, 1987-01-25 (Released:2008-03-28)

参考文献数

19

被引用文献数

1 2

---

The purpose of this paper is to obtain fundamental information concerning the heat transfer process and breakup behavior characteristics of individual small droplets impinging upon a hot surface. A uniform sized water droplet array at room temperature under atmospheric pressure was produced by the vibratory method to impinge upon a heated flat copper surface. And then, heat transfer from a surface to the droplets is assessed by a transient technique. Further, the deformation and the breakup behavior owing to the impingement of the droplet is observed by means of a drum camera recording high-speed microscopic photographs. Heat transfer effectiveness in a low temperature range of less than 125°C decreases as droplet impingement frequency increases because of interference between the impinging droplet and the remaining liquid film on a surface. It is possible that heat transfer per droplet is transfermed into a heat transfer coefficient by use of droplet residence time and film contact area on a surface. And Variations in the heat transfor coefficient for a droplet array with surface temperature are measured by difference calculus of the one dimensional unsteady heat conduction equation.

著者

吉田 和人 玉城 将 山田 耕司

出版者

社団法人日本体育学会

雑誌

日本体育学会大会予稿集

巻号頁・発行日

no.62, 2011-09-25

著者

鈴木 祥之 小松 幸平 下川 雄一 中尾 方人 北守 顕久 秦 正徳 中治 弘行 森 拓郎 須田 達 松本 慎也 向坊 恭介 向井 洋一 山田 耕司 後藤 正美 斎藤 幸雄 斎藤 幸雄 棚橋 秀光

出版者

立命館大学

雑誌

基盤研究(S)

巻号頁・発行日

2007

---

伝統構法木造建築物では、仕口・接合部や耐力壁など構造ディテールの性能評価を含めた総合的かつ合理的な構造設計法は、いまだ確立されていない。本研究では、木材のめり込みなどによる仕口・接合部の耐力発現のメカニズムおよび土塗り壁や木造軸組の力学特性や破壊性状を実験的かつ解析的に解明するとともに、構造ディテールに基づく伝統木造建築物の設計法に適用するための評価手法を開発した。

著者

山田 耕司 小林 正

出版者

豊田工業高等専門学校

雑誌

豊田工業高等専門学校研究紀要 (ISSN:02862603)

巻号頁・発行日

vol.39, pp.135-138, 2006-11-24

---

Architects want the free shape for their architecture from the ordinary structural design. Free shape design needs the structural design agent system for their probability of structural limit. This report deals with the both the scanning of a free shape and the creation of its structural analysis data. As results, the smooth surface needs the scanning accuracy of 1/50-length for the short span of scanning object. The complicated surface needs the scanning accuracy of 1/4-wavelength of its surface. The useful file format is 3DMF. The smooth surface decreases the total number of nodal points into 10% of original scan data, and it can be analyzed with shell elements. The complicated surface needs 3Ds olid analysis with hexahedral solid elements.

著者

山田 耕司

出版者

一般社団法人日本建築学会

雑誌

東海支部研究報告集 (ISSN:13438360)

巻号頁・発行日

no.43, pp.201-204, 2005-02