基于Rough集理论的矿井突水规则获取     

冯利军 《煤田地质与勘探》2003,31(1):38-41

以突水样例的一个子集为例,采用可变精度的Rough集模型,经过对原始决策信息表的数据预处理、属性约简、值约简和规则生成等主要步骤,最终获得了与该样例子集相适应的若干突水规则,这些规则较好地覆盖了该样例子集所包含的突水信息,具有同等的分类决策效果。   相似文献   

A spatial heterogeneity-based rough set extension for spatial data     

Hexiang Bai  Deyu Li  Yong Ge  Jinfeng Wang 《International journal of geographical information science》2019,33(2):240-268

When classical rough set (CRS) theory is used to analyze spatial data, there is an underlying assumption that objects in the universe are completely randomly distributed over space. However, this assumption conflicts with the actual situation of spatial data. Generally, spatial heterogeneity and spatial autocorrelation are two important characteristics of spatial data. These two characteristics are important information sources for improving the modeling accuracy of spatial data. This paper extends CRS theory by introducing spatial heterogeneity and spatial autocorrelation. This new extension adds spatial adjacency information into the information table. Many fundamental concepts in CRS theory, such as the indiscernibility relation, equivalent classes, and lower and upper approximations, are improved by adding spatial adjacency information into these concepts. Based on these fundamental concepts, a new reduct and an improved rule matching method are proposed. The new reduct incorporates spatial heterogeneity in selecting the feature subset which can preserve the local discriminant power of all features, and the new rule matching method uses spatial autocorrelation to improve the classification ability of rough set-based classifiers. Experimental results show that the proposed extension significantly increased classification or segmentation accuracy, and the spatial reduct required much less time than classical reduct.  相似文献   

基于Rough Set理论的油层识别方法   总被引：1，自引：0，他引：1  

陈遵德 《地球物理学进展》1998,13(4):52-59

本文简介了智能信息处理中新出现的Ｒｏｕｇｈ Ｓｅｔ（ＲＳ）理论,讨论了ＲＳ理论进行决策分析的方法,提出了将连续属性离用化的最优化思想,并探讨了ＲＳ理论用于测井数据判别油水层的问题。判别结果表明;本方法具有速度快,易实现,可优选属性等特点,且判别符合油水层的问题,判别结果表明：本方法具有速度快,易实现,可优选属性等特点,且判别符合率优于手工方法与ＢＰ网络方法,具有实用价值。  相似文献   

粗糙表面对雷电水平电场影响的模拟研究   总被引：2，自引：2，他引：0  

高金阁  张其林  李东帅  张源源  樊艳峰 《气象科学》2013,33(6):627-633

利用分形方法模拟了粗糙陆地表面和海陆交接复杂表面,并通过Barrick提出的等效表面阻抗法和Cooray-Rubinstein（C-R）近似算法,计算了不同粗糙表面情况下的雷电水平电场。进而分析了粗糙陆地表面和海陆交接复杂表面对水平电场产生的影响。结果表明：当雷电水平电场沿粗糙陆地表面传播时,陆地表面的粗糙程度对电场影响很大,且随着粗糙度的增加,雷电水平电场的初始峰值会逐渐减小;当水平电场沿海陆交接复杂表面传播时,陆地的粗糙度对水平电场影响较大,而海浪起伏程度对电场影响较小。  相似文献