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中文摘要：
目的是探讨精度与程度的复合，建立并研究新的粗糙集拓展模型．基于程度与精度的逻辑差需求，提出了程度下近似算子与变精度上近似算子的差运算模型，得到了程度下近似算子与变精度上近似算子的差运算的宏观本质、精确描述与基本性质．并用一个医疗实例说明了模型的意义和应用．程度下近似算子与变精度上近似算子的差运算模型，部分的拓展了程度粗糙集模型和经典粗糙集模型．
英文摘要：
This paper aims to study combination between precision and grade, construct and study new extended rough set model. Based on logical difference requirement of grade and precision, difference operation model of grade lower approximation operator and vari- able precision upper approximation operator is proposed, and its macroscopic essence, precise description, basic properties are all.obtained. A medical example is given to explain the sig- nificance and application of the new model. The new model has partially extended the graded rough set model and classical rough set model.
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