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Design and Implementation of Two-Level Metadata Server in Small-Scale Cluster File System
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作者 LIU Yuling YU Hongfen SONG Weiwei 《Wuhan University Journal of Natural Sciences》 CAS 2006年第6期1939-1942,共4页
The reliability and high performance of metadata service is crucial to the store architecture. A novel design of a two-level metadata server file system (TTMFS) is presented, which behaves high reliability and perfo... The reliability and high performance of metadata service is crucial to the store architecture. A novel design of a two-level metadata server file system (TTMFS) is presented, which behaves high reliability and performance. The merits both centralized management and distributed management are considered simultaneously in our design. In this file system, the advanced-metadata server is responsible for manage directory metadata and the whole namespace. The double-metadata server is responsible for maintaining file metadata. And this paper uses the Markov return model to analyze the reliability of the two-level metadata server. The experiment data indicates that the design can provide high throughput. 展开更多
关键词 reliability two-level metadata server Markov return model failover
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Stock Returns, Volatility, and Cointegration among Chinese Stock Markets 被引量:1
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作者 QiZhou ZhongguoZhou 《China & World Economy》 SCIE 2005年第2期106-122,共17页
This paper examines stockreturns, volatility, and cointegration among three Chinese stock marketsbeforeand afterHong Kong’sreturn to China. Theaverage daily returnsaremuch higherduring the first sub-period (from Apri... This paper examines stockreturns, volatility, and cointegration among three Chinese stock marketsbeforeand afterHong Kong’sreturn to China. Theaverage daily returnsaremuch higherduring the first sub-period (from April1991 to June1997)and significantlyloweror even negativeduring the second sub-period (from July1997 to December2002). The mean adjusted changein volatilityis negativelyand significantly correlated with thelagged returns. This negative relation is mainly caused by a contemporaneous and significantly positive correlation between returnsand volatilityinthe firstsub-period. Thissignificant relationship disappears forthe Shanghai and Shenzhen Stock Exchanges and is even negative for the Hong Kong Stock Exchange during the second sub-period. Three Chinese stock markets arecointegrated over the entiresampleperiod and becomemore closelyrelated after Hong Kong’s return to China. Our results have important implications for both policy makers and individual investors. 展开更多
关键词 return and volatility cointegration VAREC model
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