A crucial problem that needs to be solved for normalization of temporal databases is to compute the membership problem for sets of TFDs.
类似于传统的函数依赖(FDs),TFD集的成员籍问题是时态模式规范化所要解决的一个关键问题。
In order to organize effectually the time-varying data, temporal functional dependencies ( TFDs) can be used to design effectively temporal databases.
为了有效地组织这些时间变化数据,可以使用时态函数依赖(TFDs)对时态数据库进行有效地设计。
Also , we have undertaken some statistical researches of galaxy sample based on SDSS and 2 MASS databases.
以SDSS和2MASS巡天数据为基础,开展了大样本星系统计性质的研究.
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