The water quality of the Beitang Drainage River during these seasons was evaluated by the improved principal component analysis method and Nemerow index method.

运用内梅罗指数法验证了改进的主成分分析法的结论，并得出了三个水期的相对污染程度。

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This paper proposes a method based on Principal Component Analysis (PCA) combined with improved K-means for action potential classification.

基于此，提出基于主元分析(pca)和改进K均值相结合的动作电位分类方法。

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