同时又参照SQL语句的形式提出了一种类SQL语句来对基于关系的文件接入模型进行操作。
A new SQL which is similar to the SQL used in relational database is used to operate file.
研究了授权频段的两种频谱利用方法：动态频谱接入和基于动态频谱接入模型之一的机会频谱接入。
In this paper, dynamic spectrum access and opportunistic spectrum access have been studied, which are the two methods of spectrum usage in the authorized spectrum band.
首先，通过对系统性能以及STATCOM数学模型的分析，对原有数学模型进行了数学推导引入了STATCOM接入点的电压偏差作为控制变量。
At first, through analysis of the system performance and the mathematics matrix of STATCOM, we introduced the voltage of the point where STATCOM jointed in the system as state variable.
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