其次，我们对差别矩阵差别函数的方法进行了研究。
Secondly, we investigate the method of discernibility matrix and function.
论文的改进算法以属性的频率作为选择属性的启发信息，由过滤差别矩阵得到属性的频率。
In the improved algorithm in this paper, using frequency as the heuristic information of attributes selection, getting frequency of attributes from the filtered discernibility matrix.
在不完备信息系统基于差别矩阵的属性约简算法中，相容类和最大相容类中的对象具有不确定性。
In incomplete information system, objects of the tolerance class and maximal consistent block in the attribute reduction algorithm based on discernibility matrix are uncertain.
分析了目前常用求属性核方法，大都建立在内存中，需要构造差别矩阵，存在时空复杂度较大的不足。
Methods used now almost stay in memory, and need to create discernibility matrix, so that it may lead to some demerits as time and space complex.
给出了相似粗糙集的基本定义，以及利用该方法基于差别矩阵进行特征权值计算 的两个定理。
The definitions of SRS and two theorems of computing the feature weights based on discernibility matrix are presented.
在此基础上提出一种基于改进差别矩阵的核增量式更新算法，主要考虑对象动态增加情况下核的更新问题。
The authors introduced an incremental updating algorithm for computing core based on improved discernibility matrix, which mainly considered core updating when objects dynamically increased.
提出了一种适于相容和不相容两种形式信息系统差别矩阵的统一构造方法，证明了用该差别矩阵求核的正确性。
In this paper, a construction method of discernibility matrix for both consistent information systems and inconsistent information systems is presented.
针对差别矩阵求约简过程中合取范式向析取范式等价转换的难题，提出一种基于差别矩阵构造约简树的有效方法。
Aiming at the problem of equivalent conversion from conjunctive normal form to disjunctive normal form, an effective algorithm was proposed to construct reduction tree based on discernibility matrix.
在此基础上给出一个求核算法，通过实例证明，由于减少了差别矩阵中的元素，因此算法的求核效率得到较大提高。
An algorithm of compute core is provided. An example illustrates that the elements of discernibility matrix in this algorithm reduce and the efficiency of computing core is improved.
介绍了粗糙集数据约简概念，包括相对约简和绝对约简，并将它们统一为差别列表上的集合操作，其中差别列表是从差别矩阵引伸而来的。
The problems of data reduction, including relative reduction and absolute reduction are introduced and unified as the set operation on difference list that is come from the difference matrix.
以米勒矩阵理论为基础，推导出了各向异性表面近正入射反射米勒矩阵，并以此为依据给出反射差别系统的优化设计。
Mueller matrix of anisotropy surface in the near-normal incident is derived in this paper, and a new type of reflectance difference spectrometer has been designed based on the matrix.
以米勒矩阵理论为基础，推导出了各向异性表面近正入射反射米勒矩阵，并以此为依据给出反射差别系统的优化设计。
Mueller matrix of anisotropy surface in the near-normal incident is derived in this paper, and a new type of reflectance difference spectrometer has been designed based on the matrix.
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