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中文摘要：
为了实现高效的数据备份，提出一种Linux上数据备份的方法。方法在远程建立灾备中心，支持多用户；仅将用户磁盘的有效数据发送到灾备中心的数据库，节省存储空间；在Linux内核中监视磁盘的I／O操作，获取实时数据；采用差异恢复策略，提高恢复效率。该方法能保证在用户服务器的服务不停止的情况下，实现高效、廉价的多用户数据备份。
英文摘要：
In order to implement the high efficient data backup, a method worked on Linux was presented. The method established a disaster backup center and supported multiple users. It sent the effective data of the users＇ disk to the disaster backup center＇ s database only and saved storage space. It monitored I/O operation of the disk in Linux kernel and obtained real--time data. For the sake of recovery performance, the technology of differential recovery was adopted. This method provides high efficient, cost-effective and multiple users＇ data backup without affecting the service of users＇ server.
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Generalized Multi-Channel Amplitude-and-Phase Coded Modulation for Differential Space-Time Communica
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