To obtain knowledge and data from incomplete decision table(IDT), the paper presents a new doubly variable precision limited tolerance rough set theory model(VPLTRST).
为了能够从不完备决策表（IDT）中进行知识发现和数据挖掘，提出一种新的具有对称性的双重可变精度限制容差关系粗集模型（VPLTRST）。
This article applies the generalized covering rough set theory to information retrieval model.
将广义覆盖粗糙集理论及其计算运用到信息检索模型。
This paper introduce the basic concept and character of rough set theory, and attempt to combine seismic damage prediction, then set up a model of congregated seismic damage prediction.
介绍粗糙集理论的基本概念及特点，尝试将其与震害预测工作联系，建立一种群体震害预测模型。
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