This article proposes a usage of rough collection theory by optimizing the BP nerve network model method, and will apply the optimized network model in the rolling bearing breakdown diagnosis.

提出了使用粗糙集理论优化BP神经网络模型方法，并将优化后的网络模型应用于滚动轴承的故障诊断中。

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In this fact sheet, we attempt to provide a rough state-by-state breakdown for the effects of the entire ARRA. However, it is important to emphasize that these disaggregate estimates are inherently more speculative and uncertain.

WHITEHOUSE: Recovery Act Third Quarterly Report - Supplement | The White House