Rough set theory, as an effective tool to deal with vagueness and uncertainty, is effective to the time series data mining.
粗糙集理论作为一种处理模糊和不确定性问题的有效工具，对时间序列的数据挖掘是有效的。
Since urban travel times are stochastic and uncertain, a model for addressing urban travel time prediction by using transport information granular computing theory based on rough set was proposed.
由于城市道路交通问题具有不确定性和不精确性，故采用基于粗糙集的交通信息提取计算理论建立城市道路行程时间预测模型。
Countermeasures: to do a rough time estimate the daily homework assigned by the teacher, children will need to complete the task (including parents set tasks) for a time expected.
对策：把每天老师布置的作业做一个大概的时候估计，将孩子需要完成的任务(包括家长布置的任务)进行一个时间预计。
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