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中文摘要：
区间值信息系统是单值信息系统的一种扩充。首先在区间值信息系统中引入了四种优势关系，分析了四种优势关系的重要性质及相互联系，并针对四种优势关系的局限性，提出了一种新的优势关系——α-优势关系，进而定义了基于α-优势关系的扩充粗糙集模型。最后，通过教师评估实例比较分析了区间值信息系统中基于优势关系的扩充粗糙集模型之间的性能。
英文摘要：
The interval-valued information system is a generalized model of a single-valued information system. Four dominance relations are introduced to the interval-valued information system, and some important properties and relationships among four dominance relations are analyzed. Furthermore, based on limitations of the four dominance relations, a novel dominance relation α-dominance relation is proposed. And then, an extended Rough set model based on a-dominance relation is defined. Finally, through a teacher evaluation issue, performances of these extended rough set models based on dominance relation are also compared.
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