云模型是定性概念与其定量表示之间进行不确定性转换的有效工具。目前对正态云模型已有较多研究,但对梯形云模型方面的研究很少。相对于正态云模型而言,梯形云模型在生活中更具一般性,用梯形云表示数值型语言概念有其特有的优势。给出了梯形云的一些相关定义,并且在分析了云理论中现有的基于正态云的概念划分和概念提升方法的基础上,提出了引入梯形云模型后新的云变换和软或操作方法,这些方法为解决数据发掘中许多关键问题提供了基础。
Cloud model is an effective tool in uncertain transforming between qualitative concepts and their quantitative expressions. The normal-cloud model is extensively studied presently and the research on trapezium cloud-model is less. Compared to the normal- cloud model, trapezium-cloud model has extensive exist in everyday life and own merits to represent numerical concept; Some related definitions of trapezium-cloud are given, and the new methods of cloud transform and soft-or operation that has combine with trapezium- cloud model are proposed, based on the analyse of the existing method of conception division and conception exaltation in cloud theory. These methods provide the base to solve some key problems in data mining.