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A major limitation of NAND flash memory is erase-before-program characteristics. It incurs write amplification, severely degrading system performance and endurance. Previous works reveal that metadata update substantially contributes to write amplification in object-based NAND flash device (ONFD). To further reduce the overhead of metadata update in ONFD, we propose a hybrid buffer scheme (HBS) by...
Write amplification is a major cause of performance and endurance degradations in NAND flash based storage systems. In an object-based NAND flash device, two causes of write amplification are onode partial update and cascading update. Updating one onode, a kind of small-sized object metadata, invokes partial page update (i.e., onode partial update) that incurs unnecessary migration of the un-updated...
Due to the serious condition of safety production in hydropower construction project on the whole, it is an urgent need to evaluate hydropower engineering construction safety. But the problem of the mapping relationship between evaluation index and accidents, fixed and variable weight, randomness and fuzziness and so on, can't be solved through the traditional safety evaluation method for hydraulic...
A compression algorithm based on partial SPIHT with classified weighted rate-distortion optimization and adaptive coding depth control is proposed. The different significance weights are initially given to every coding passes in each zero tree, according to the category of interferential regions and the significance of coding bitplanes. Then we determine the coding depth of each zero tree by significance...
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