著者

伊東 聰江

出版者

早稲田大学エジプト学会

雑誌

エジプト学研究 (ISSN:09192417)

巻号頁・発行日

no.7, pp.144-146, 1999

著者

鈴木 惣一朗 伊東 聰 酒井 憲一郎 稲田 由江 三吉 郁夫 石川 裕 宮野 悟

雑誌

研究報告ハイパフォーマンスコンピューティング(HPC) (ISSN:21888841)

巻号頁・発行日

vol.2021-HPC-178, no.18, pp.1-9, 2021-03-08

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我々はスーパーコンピュータ「富岳」開発プロジェクトのターゲットアプリケーションのひとつとして,ヒト全ゲノム解析プログラム Genomon の「富岳」向け移植と最適化を行ってきた.本稿では,その最適化内容と「富岳」での性能評価について報告する.Genomon の実行性能はディスク I/O 性能に依存するため,特に「富岳」に実装された LLIO(Lightweight Layered IO-Accelerator)ファイルシステムをどのように活用したかを中心に報告する.また,Genomon のスループット性能向上のために試みた複数パイプライン同時実行についても報告する.

著者

土田 潤 伊東 聰 藤澤 智光 矢川 元基

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.69, no.678, pp.280-285, 2003-02-25

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The sounding mechanism in air-reed instruments is investigated based on the computational fluid dynamics. While previous studies have assumed a sound source based on acoustic theory, the authors attempt in the present study to elucidate exactly the source of sound as an essential factor defining the timbre of musical instruments. To deal with the large computational grids required to capture minute changes in pressure, the Hitachi SR 8000 massively parallel supercomputer is employed for computation. The computational results are consistent with Brown's experimental equation, and new frequency component revealed only in this three-dimensional analysis is identified, attributed to the harmonics of the air jet.

著者

佐味 弘之 高野 孝義 谷沢 清岳 吉富 和宣 伊東 聰智 宮崎 敏

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.69, no.678, pp.512-520, 2003-02-25 (Released:2008-03-28)

参考文献数

14

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The ignition phenomena of diesel fuel spray injected into a constant volume vessel with medium injection pressure were investigated. Results show that ignition occurs at a certain point near the surface of spray liquid column before breakup where activation reaction is advanced one step ahead of others and the impingement plate assists surface ignition. From these results was deduced the following concept that fuel vaporized from the liquid surface begins to be activated when the velocity gradient at the liquid column surface decreases to a certain level, leading to ignition. The blowing-off limited ignition model was proposed from this concept. Based on the functional relation between various factors and the ignition delay derived from this model, the ignition delay date were well arranged into an experimental formula. Next, ignition investigation was carried out using a bottom-viewed single cylinder engine, revealing that the effects of many factors including EGR rate related to O2 concentration can be analyzed comprehensively based on the above model.