KPCA was introduced into customer churn prediction, and the corresponding feature abstraction method was presented.

将核主成分分析(KPCA)引入到客户流失预测中, 提出了相应的特征提取算法.

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Vibration Testing and analysis are the chief means for fault feature abstraction and fault diagnosis.

振动信号的测试分析是识别旋转机械的故障性质、寻找故障源的主要方法和手段.

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