School of Information Science and Technology Zhejiang Sci-Tech University Hangzhou 310018 China;
School of Information Science and Technology Zhejiang Sci-Tech University Hangzhou 310018 China;
School of Information Science and Technology Zhejiang Sci-Tech University Hangzhou 310018 China;
Time series; PCA dimensionality reduction; dynamic time warping; hierarchical clustering; cophenetic correlation;