| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 104 === There are many language learning tools in market, but most of them do not allow users to revise their database. To make version control easier, the tools are like dictionaries. They do not need to concern change of database, but their usefulness is limited. If a language learning tool allows users to change database, it needs to back up the database to keep database when users change the device. In addition, it needs to concern the control of database version and synchronization between multiple devices. The above functions need users’ devices be connected to the Internet. This theorem mainly investigate how to do database backup with the Internet, allow user to change the database without the Internet, and support multiple devices to synchronize with the database stored in cloud.
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