| 不完备信息系统的下近似分布约简与规则 |
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| 引用本文： | 许伟,张国华,张文修.不完备信息系统的下近似分布约简与规则[J].西安工业学院学报,2004,24(4):386-390. |
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| 作者姓名： | 许伟 张国华 张文修 |
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| 作者单位： | [1]西安交通大学理学院，西安710049 [2]西安工业学院 |
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| 摘 要： | 研究了不完备信息系统的知识发现问题．将带有未知数据的不完备信息系统看作集值信息系统，提出了一种新的约简方法一下近似分布约简，给出了判定定理，并根据约简方法给出了下近似分布规则的定义、辩识函数以及对象x所支持的所有下近似分布规则的方法．证明了完备信息系统协调时，x-下近似分布规则是x-确定规则，说明了下近似分布规则是确定规则的推广。
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| 关 键 词： | 不完备信息系统 集值信息系统 粗糙集 约简 目标规则 |
| 文章编号： | 1000-5714(2004)04-0386-05 |
| 修稿时间： | 2004年6月18日 |
Lower-approximation distribution reduct and rules in incomplete information system |
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| XU Wei,ZHANG Guo_hua,ZHANG Wen_xiu.Lower-approximation distribution reduct and rules in incomplete information system[J].Journal of Xi'an Institute of Technology,2004,24(4):386-390. |
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| Authors: | XU Wei ZHANG Guo_hua ZHANG Wen_xiu |
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| Affiliation: | XU Wei~1,ZHANG Guo_hua~2,ZHANG Wen_xiu~1 |
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| Abstract: | This paper deals with knowledge discovering in incomplete information systems.An incomplete information system with unknown date can be regarded as set_valued system.A new method of reduct called lower_approximation distribution reduct from incomplete information system is presented.The judgement theorem of reduct is proposed.The definition of the lower_approximation distribution rules,the discernibility function,and the method of all the lower_approximation distribution rules for object x are presented.It is proved that x_lower_approximation distisbution rules are x_certain rules when a complete infrmation system is consistent.It is illustrated that lower_approximation distribution rules in inlomplete information system is extension of certain rules. |
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| Keywords: | incomplete information system set_value system rough set reduct decision rule |
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