广义不完备信息系统的知识约简 *

以同时具有丢失型和遗漏型未知属性值的广义不完备信息系统为研究对象，提出了一种新的二元关 系，并基于此关系讨论了其中的知识约简问题。在广义不完备信息系统中，引入了约简、广义区分矩阵等概念， 并给出了约简的判定定理和知识约简算法。最后，通过一个具体的例子，说明了约简算法在广义不完备信息系 统中处理模糊和不确定性知识是可行、有效的，为从复杂的不完备信息系统中获取知识提供了新的理论基础与 技术手段。

Knowledge reductions in generalized incomplete information systems

This paper investigated the generalized incomplete information systems in which lost and "do not care" unknown values were coexisting.Based on a new dual relation,studied approach to knowledge reduction in the generalized incomplete information systems.From the view point of the dual relation based rough set model,introduced the knowledge reductions and discernibility matrixes into the generalized incomplete information systems.Also obtained the judgment theorems and algorithm associated with these knowledg...