根据各时段各主成分的特征向量计算出主成分的指标值。并分析得出各个时间段的耕地变化驱动因子。
Indicators of each principal component were calculated according to the eigenvalues of each of them, and driving forces of cultivated land in each period can acquired.
针对点-时段时序逻辑的不足，提出了一种新的时段时序逻辑——扩展时段时序逻辑，对不确定时间段发生的事件具有较好的描述能力。
A method for modeling imprecise temporal aspects of discrete-event systems, extended interval temporal logic, is proposed, which is an extension of the traditional point-interval temporal logic.
广告时段-电视台可供广告播出的时间，通常以三十秒为一个时间段。
Avails - a network's time slots "available" for ads, usually in 30 second segments.
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