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24 results on '"Inagaki, Ryoichi"'

15. Automated Cache Hint Annotation Method on Itanium2 Processor

Author

Inagaki, Ryoichi, 上田, 和紀, and 上田研究室

Subjects
キャッシュ, Cache, コンパイラ, Itanium, Cache hint, Compiler, Optimizatioin, 最適化, キャッシュヒント, Computer science
Abstract

本研究では，Itanium2 プロセッサにおいてキャッシュヒントを自動的に付加することでソフトウェアの性能を向上させることを目的としている． キャッシュヒントはデータが配置されるキャッシュ階層を各メモリアクセス命令単位で制御する機能であり，適切に使用することでキャッシュの利用効率を向上させることができる．しかし，既存のコンパイラはキャッシュヒントを使用したオブジェクトコードを生成しないため，現状では直接利用することができない．本研究では既存のコンパイラを使用しながらも，キャッシュヒントをプログラムに対して自動的に付加する手法を提案する．提案する手法を FFT ライブラリ FFTE および数値計算ライブラリ ATLAS のコンパイルに適用した．その結果，キャッシュヒントを付加しない場合に比べて最高 15% の性能向上を達成した．また，プロセッサイベントの計測結果からキャッシュヒントの付加により L3 キャッシュのヒット率が向上したことも確認できた．, 修士論文

Published
2005

23. Influence of a new denture cleaning technique based on photolysis of H2O2 on the mechanical properties and color change of acrylic denture base resin.

Author

NAKAHARA, Tatsuro, HARADA, Akio, YAMADA, Yasutomo, ODASHIMA, Yu, NAKAMURA, Keisuke, INAGAKI, Ryoichi, KANNO, Taro, SASAKI, Keiichi, and NIWANO, Yoshimi

Subjects
DENTURES, PHOTOLYSIS (Chemistry), LIGHT emitting diodes, HYDROXYL group, ACRYLIC resins
Abstract

The purpose of this study was to evaluate the influence of a disinfection technique based on photolysis of H2O2 on the mechanical properties and color change of acrylic denture base resin. Resin specimens were immersed in 1 M H2O2 irradiated with light-emitting diode (LED) light at 400 nm for 1 week. The immersion duration of 1 week (168 h) corresponded to performing approximately 500 times of 20-mm cleaning. Hydroxyl radicals are potent oxidants and they were generated via the photolysis of H2O2. Oxidative damage caused by these radicals included reduced flexural strength and altered color for the acrylic resin. Nonetheless, the degraded flexural strength and altered color of acrylic resin after 500 times of cleaning in the disinfection system would be within clinically acceptable levels. [ABSTRACT FROM AUTHOR]

Published
2013
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24. Corrosive effect of disinfection solution containing hydroxyl radicals generated by photolysis of H202 on dental metals.

Author

NAKAMURA, Keisuke, YAMADA, Yasutomo, TAKADA, Yukyo, MOKUDAI, Takayuki, IKAI, Hiroyo, INAGAKI, Ryoichi, KANNO, Taro, SASAKI, Keiichi, KOHNO, Masahiro, and NIWANO, Yoshimi

Subjects
CORROSION & anti-corrosives, DISINFECTION & disinfectants, HYDROXYL group, PHOTOLYSIS (Chemistry), HYDROGEN peroxide, DENTAL metallurgy, SOLUTION (Chemistry), COMMUNICABLE diseases
Abstract

The purpose of the present study was to evaluate the corrosive effect of disinfection solution containing hydroxyl radicals generated by photolysis of H202 on dental metals. Static immersion test was performed on four different dental metals: Ti, Type 316L stainless steel, Ag-Pd-Cu-Au alloy, and Co-Cr alloy. Metal specimens were immersed in 1 M H202 (=3.4%) with or without light-emitting diode (LED) light irradiation (wavelength: 400 nm) for 1 week, and then the amounts of released ions were analyzed. Corrosive effect of the disinfection solution containing hydroxyl radicals on any dental metals tested in the present study never exceeded that of H202 alone. Therefore, disinfection systems based on the photolysis of H202 for the cleaning of dentures and treatment of oral infectious diseases would not cause problematic metal corrosion whenever the concentration of H202 does not exceed 3%, which is a concentration used as an oral disinfectant. [ABSTRACT FROM AUTHOR]

Published
2012
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