本文对粗糙集理论作了进一步的扩充，提出了众数粗糙集模型，并将该模型应用到医用物理学习动机因素与效果关联性分析中，取得了很多有意义的结果。

The modal of mode rough set is raised and the modal is applied to motive factor on medical physics learning and on the analysis of effect relativity, and many significant results are obtained.

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最后进一步运用序号总和理论和众数理论，检验了基于PPCA的评价结果与现有方法评价结果之间的精度差异。

Then further applying Sequence-number Summation Theory and Mode Theory, to check up the appraisal precision difference between appraisal results based on PPCA method and exiting methods.

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