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An adaptive sliding window for anomaly detection of time series in wireless sensor networks

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Abstract

Recent years, anomaly detection for time series in wireless sensor networks has attracted much research attention. Existing anomaly detection methods based on pattern representation ignore the trend features of an original sequence. This leads to low detection accuracy. This paper aims to solve the above problem with an adaptive sliding window for anomaly detection. The advantage of this method is that the size of the sliding window is changed according to the trend of the time series. Thus, the extracted trend feature points can accurately represent an original time series. The pattern representation is vertically divided into several subspaces with equal-size in the time domain. We employ four features which are extracted from each subspace to obtain a pattern matrix. The similarity among different patterns is measured according to the similarity matrix which is formed by pattern matrices. Finally, anomaly scores obtained from similarity matrices are compared with a threshold to detect anomaly. The proposed method is verified on two synthetic datasets and a real-world dataset. Experimental results showed that our method could improve the accuracy and reduce the specificity compared to three classic models.

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Acknowledgements

This work was partly supported by the Scientific Research Program Funded by Shaanxi Provincial Education Department (No. 21JP115), the International Science and Technology Cooperation Program of the Science and Technology Department of Shaanxi Province, China (Grant No. 2018KW-049), and the Communication Soft Science Program of Ministry of Industry and Information Technology, China (Grant No. 2019-R-29), the Science and Technology Project in Shaanxi Province of China (Program No.2019ZDLGY07-08).

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Authors and Affiliations

  1. School of Computer, Xi’an University of Posts and Telecommunications, Xi’an, 710121, China

    Zhongmin Wang, Yue Wang, Cong Gao & Yanping Chen

  2. Shaanxi Key Laboratory of Network Data Analysis and Intelligent Processing, Xi’an University of Posts and Telecommunications, Xi’ an, 710121, Shaanxi, China

    Cong Gao & Yanping Chen

  3. Xi’an Key Laboratory of Big Data and Intelligent Computing, Xi’an University of Posts and Telecommunications, Xi’an, 710121, Shaanxi, China

    Zhongmin Wang

  4. ZTE Corporation, No. 55, Hi-Tech Road South, Shenzhen, 518057, China

    Fengwei Wang & Tingwu Lin

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  1. Zhongmin Wang
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Correspondence to Yue Wang.

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Wang, Z., Wang, Y., Gao, C. et al. An adaptive sliding window for anomaly detection of time series in wireless sensor networks. Wireless Netw 28, 393–411 (2022). https://doi.org/10.1007/s11276-021-02852-3

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