不确定数据流多维建模方法*

由于不确定数据流应用的出现,给传统的精确、静态数据环境下的多维建模带来了巨大挑战。针对不确定数据流动态、无限和不确定等特征,提出了一种不确定数据流多维模型。该模型中引入了不确定对象来描述不确定事实元组,并且通过定义时间维度的层次时间窗口,很好地反映了数据流的动态性和无限性,最后还对此多维不确定数据流模型的基本代数操作和分析代数操作进行了形式化定义,为不确定数据流多维查询与分析提供了理论依据。

Multi-Dimensional modeling method of uncertain data stream

Because of the emergence of uncertain data stream applications, the traditional multi-dimensional model based on precise and static data is confronted with some new challenges. A multi-dimensional uncertain data stream model based on characters of uncertain data stream was presented, such as dynamic, infinite, uncertainty and so on. This model introduced uncertain object to depict uncertain facts, and defined the time dimension with multi-level time windows to reflect the dynamic and infinity of data stream.The basic algebraic operations and analytic algebraic operations of the multi-dimensional uncertain data stream was defined formally, which gives theoretical support to multidimensional query and analysis of uncertain data stream were provided.