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A human activity recognition method using wearable sensors based on convtransformer model

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Abstract

Deep learning models have recently attracted great interest as an effective solution to the challenging problem of human activity recognition (HAR) and its widespread applications in medical rehabilitation and human–computer interaction. However, it is difficult for many existing models to simultaneously extract global temporal features and local spatial features of activity data. This paper proposes a deep learning model, ConvTransformer, based on convolutional neural network (CNN), Transformer, and attention mechanism. The model first uses the convolutional layer to model the local information of the sensor time series signal, then uses Transformer to obtain the temporal correlation of the feature sequence, adds an attention mechanism to highlight essential features, and finally completes the activity recognition through the fully connected layer (FC). We evaluate the model on four public datasets, and the experimental results show that the model achieves 92%, 99%, 97%, and 86% accuracy on the OPPORTUNITY, PAMAP2, SKODA, and USC-HAD datasets, respectively. Compared with the baseline Transformer and existing state-of-the-art methods, the model has higher recognition accuracy and better robustness. In addition, we explore the strengths and limitations of the method proposed in this paper by tuning hyperparameters and optimization strategies.

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Data availability

This study is an analysis of existing public datasets. The OPPORTUNITY dataset is available from the UCI Machine Learning Repository: http://archiive.ics.uci.edu/ ml/datasets/OPPORTUNITY+Activity+Recognition. The PAMAP2 dataset is available from the UCI Machine Learning Repository: https://archive.ics.uci.edu/ml/datasets/PAMAP2+Physical+Activity+Monitoring. The SKODA dataset is from the Wearable Computing Laboratory at ETH Zurich. This dataset is free to use provided that papers provided by the authors are cited. The USC-HAD dataset is available from the work of Mi Zhang and Alexander A. Sawchuk: https://sipi.usc.edu/had/.

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Acknowledgements

This work was supported by the National Science Foundation of China (61563032, 61963025); Project (18JR3RA133) supported by Gansu Basic Research Innovation Group, China; Open Fund Project of Industrial Process Advanced Control of Gansu Province (2019KFJJ02), China.

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Authors and Affiliations

  1. College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Zhanpeng Zhang, Wenting Wang, Aimin An & Yuwei Qin

  2. Key Laboratory of Gansu Advanced Control for Industrial Processes, Lanzhou, 730050, China

    Aimin An

  3. National Demonstration Center for Experimental Electrical and Control Engineering Education, Lanzhou University of Technology, Lanzhou, 730050, China

    Aimin An

  4. College of Physics and Electrical Engineering, Weinan Normal University, Weinan, 714000, China

    Fazhi Yang

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  1. Zhanpeng Zhang
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Correspondence to Aimin An.

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Zhang, Z., Wang, W., An, A. et al. A human activity recognition method using wearable sensors based on convtransformer model. Evolving Systems 14, 939–955 (2023). https://doi.org/10.1007/s12530-022-09480-y

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