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Backup Policies for a Database System with Temporary Large Updates
Syouji Nakamura,Cunhua Qian,Takayoshi Tamura 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11
We apply the cumulative damage model to a database backup schedule, by replacing shock by data update and damage by updated data. When the total rewritten data has exceeded a level K, a full back up is performed. However, the overhead for such a full backup might become sometimes very large in a mass database system. To lessen the overhead for backup actions, we make an independent backup policy, which copies data updated with a large amount in a short time. However, the overhead for independent backups increases in proportion to the total amount of updated data. We obtains optimum full backup intervals with independent backups to minimize the expected cost rates analytically.
Molecular catalysts for water oxidation toward artificial photosynthesis
Yagi, Masayuki,Syouji, Akinori,Yamada, Satoshi,Komi, Manabu,Yamazaki, Hirosato,Tajima, Syouhei Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.2
Artificial photosynthesis is anticipated as one of the promising clean energy-providing systems for the future. The development of an efficient catalyst for water oxidation to evolve $O_2$ is a key task to yield a breakthrough for construction of artificial photosynthetic devices. Recently, significant progress has been reported in the development of the molecular catalysts for water oxidation based on manganese, ruthenium and iridium. The molecular aspects of the catalysts reported in the last decade were reviewed to provide hints to design an efficient catalyst, as well as to gain clues to reveal the mechanism of $O_2$ evolution at photosynthetic oxygen evolving complex in nature.