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中文摘要：
以同时具有遗漏型和缺席型未知属性值的不完备信息系统为研究对象，提出了一种使用参数进行控制的自反二元关系以及相应的粗糙集模型，将这种拓展粗集模型与不完备信息系统中现有的几种拓展粗集模型进行了对比研究。对一不完备信息系统进行了实例分析，以说明新提出的二元关系的有效性。
英文摘要：
In this paper, the incomplete information system in which lost and absent unknown values are coexisting is deeply investigated. In such information systems, a reflective relation is proposed which is based on the controlling of two parameters. The rough set model based on this reflective relation is compared with some other existing rough set models which have been used to deal with incomplete information system. An illustrative example is analyzed to indicate the validity of the new - defined binary relation.
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