本文通过引进“概率元”，把连续型和离散型两类求概率分布的方法统一起来，建立起“概率元法”的理论及其计算方法。

Introduced is this paper are the probability differential method and the unify way of calculating the probability distribution of the continuous type and that of the discrete type.

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依据粗集理论研究离散化数据的特点，考虑类分布信息，采用信息熵理论进行连续条件属性的离散化。

Data discrimination is the character of RS, considering distributed information of class, and continual condition attributes are described according to information entropy theory.

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将艇体看作回转体，在轴线上分布离散的点源模拟艇体，用升力面理论的涡环栅格法模拟附体；

The hull is defined as a revolution body. The hull volume effects are represented by a series of point source and sinks distributed on the hull axis.

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将艇体看作回转体，在轴线上分布离散的点源模拟艇体，用升力面理论的涡环栅格法模拟附体；

The hull is defined as a revolution body. The hull volume effects are represented by a series of point source and sinks distributed on the hull axis.

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