The thesis studies the generalized rough set models and proposes a multi-level rough set approximation model CBM-RS based on a covering of the universe.
作者研究了粗糙集扩展理论，提出了一种多层粗糙集模型CBM-RS。 该模型是一种基于覆盖的扩展的多层粗糙集模型。
Here, we suppose that the model structure is unknown. A unified description method of model set of multi-model system, including the identification method of model structure and parameter, is given.
这里不假定模型结构已知，给出了多模型系统模型族的统一描述方法，包括模型结构与参数的辨识方法。
On the basis of the research on the frame structure of the multi-point Forming machine, its finite element model and mathematical model have been set up.
本文在对三梁四柱式多点成形压力机机架结构研究的基础上，建立了压力机机架有限元模型和机架结构优化的数学模型。
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