南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (2): 361367.
戴志聪,吴伟志*
Dai Zhicong, Wu Weizhi*
摘要: 粒计算是知识表示和数据挖掘的一个重要方法. 它模拟人类思考模式,以粒为基本计算单位,以处理大规模复杂数据和信息等建立有效的计算模型为目标. 针对具有多粒度标记的不完备序信息系统的知识获取问题,首先,介绍了不完备多粒度序信息系统的概念,并在不完备多粒度序信息系统中定义了优势关系,同时给出了由优势关系导出的优势类,并进一步定义了基于优势关系的集合的序下近似与序上近似的概念,并讨论了它们性质.
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