[1] [1] CHENG P. Research on the identification method of laser printer toner［D］. Beijing: School of International Relations, 2012:2(in Chinese).

[2] [2] YU J, WANG X F, ZHANG A L, et al. Micro laser Raman spectroscopy inspection of printed files of laser printers［J］. Journal of Light Scattering, 2003, 15(2):92-94(in Chinese).

[3] [3] CLAYBOURN M, ANSELL M. Using Raman spectroscopy to solve crime:Inks, questioned documents and fraud［J］. Science & Justice: Journal of the Forensic Science Society,2000,40(4): 261-271.

[4] [4] LIANG L N, YANG A D, LIN L X. Laser Raman spectroscopy to recognize printed files from laser printers of different manufacturers［J］.Journal of Light Scattering,2003,15(2):92-94(in Chinese)

[5] [5] SAGAR J T, BURGESS S R, McCARTHY C,et al.Elemental characterisation of sub 20nm structures in devices using new SEM-EDS technology［J］. Microelectronics Reliability,2016,64(7): 367-369.

[6] [6] LIU M, SHEN S, WANG N. Visible-near infrared hyperspectral image technology for rapid identification of laser printing toner［J］.Chinese Journal of Luminescence,2017,38(5):662-668(in Chinese).

[7] [7] YANG R Q, JIANG H, WANG Y Q, et al. Pyrolysis gas chromatography/mass spectrometry to check copy toner［J］. Chinese Journal of Chromatography, 2003,21(3):277-280(in Chinese)

[8] [8] HOU S H,BI M J.Analysis of heavy metal content in toner by EDXRF［J］.Office Informatization,2012, 11(6):51-52(in Chinese).

[9] [9] JASON X, KENNETH L.Power k-means clustering［C］//Proceedings of the 36th International Conference on Machine Learning. Long Beach, California,USA: Journal of Machine Learning Research, 2019:6921-6931.

[10] [10] ZHANG L L, GENG L G, SUN J, et al. Correlation and cluster analysis of agronomic traits of flax germplasm resources based on R language［J］.Acta Agronomica Sinica,2020,10(1):7-12(in Chinese).

[11] [11] WU G J, ZHANG J L, YUAN D. Research on k-means-based elbow method for automatically obtaining k value［J］.Software,2019,40(5):167-170(in Chinese).

[12] [12] TANG W B, LI T, ZOU P J, et al. Research on summer air conditioning load forecasting based on Pearson correlation coefficient［J］.Power Demand Side Management,2017,19(6):7-13(in Chinese)

[13] [13] TANG W J, YIN X D, YAN Q Z, et al. Application of cluster analysis in distributed optical fiber vibration sensing system［J］. Laser Technology, 2015,39(6):854-857(in Chinese).

[14] [14] WANG Q L, QIAO F, JIANG Y H. Improved k-means algorithm based on aggregation distance parameters［J］.Computer Applications,2019,39(9):2586-2590(in Chinese).

[15] [15] LIU Y F, HUANG X X, SONG H, et al. Research on the fault prediction of wind turbine gearbox in wind power generation system［J］.Computer Simulation,2019,36(3):124-127(in Chinese).