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）。
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).
系统级的凝聚特征将设计知识、几何形状以及联接关系等封装起来，克服了传统特征在功能语义表达上的不完备性。
Encapsulating design knowledge, geometry form and conjunction relationship, the agglomerated feature in system-level is generated to maintain the whole semantic elements of a function.
系统级的凝聚特征将设计知识、几何形状以及联接关系等封装起来，克服了传统特征在功能语义表达上的不完备性。
Encapsulating design knowledge, geometry form and conjunction relationship, the agglomerated feature in system-level is generated to maintain the whole semantic elements of a function.
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