Abstract
Electronic noses (e-noses) are devices that mimic the biological sense of olfaction to recognize gaseous samples in a very fast and accurate manner, being applicable in a multitude of scenarios. E-noses are composed of an array of gas sensors, a signal acquisition unit and a pattern recognition unit including automatic classifiers based on machine learning. In a previous work, a text-based approach was developed to classify volatile organic compounds (VOCs) using as input signals from an in-house developed e-nose. This text-based algorithm was compared with a 1-nearest neighbor classifier with euclidean distance (1-NN ED). In this work we studied other text-based approaches that relied in the Bag of Words model and compared it with the previous approach that relied in the term frequency-inverse document frequency (TF-IDF) model and other traditional text-mining classifiers, namely the naive bayes and linear Support Vector Machines (SVM). The results show that the TF-IDF model is more robust overall when compared with the Bag of Words (BoW) model. An average F1-score of 0.84 and 0.70 was achieved for the TF-IDF model with a linear SVM for two distinct gas sensor formulations (5CB and 8CB, respectively), while an F1-score of 0.66 and 0.71 was achieved for the BoW model for the same formulations. The text-based approaches appeared to be less reliable than the traditional 1-NN ED method.
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References
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Acknowledgements
This project has received funding from the European Research Council (ERC) under the EU Horizon 2020 research and innovation programme [grant reference SCENT-ERC-2014-STG-639123, (2015-2022)] and by national funds from FCT - Fundação para a Ciência e a Tecnologia, I.P., in the scope of the project UIDP/04378/2020 and UIDB/04378/2020 of the Research Unit on Applied Molecular Biosciences - UCIBIO and the project LA/P/0140/2020 of the Associate Laboratory Institute for Health and Bioeconomy - i4HB, which is financed by national funds from financed by FCT/MEC (UID/Multi/04378/2019). This work was also partly supported by Fundação para a Ciência e Tecnologia, under PhD grant PD/BDE/142816/2018.
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Alves, R., Rodrigues, J., Ramou, E., Palma, S.I.C.J., Roque, A.C.A., Gamboa, H. (2023). Comparing Different Dictionary-Based Classifiers for the Classification of Volatile Compounds Measured with an E-nose. In: Roque, A.C.A., et al. Biomedical Engineering Systems and Technologies. BIOSTEC 2022. Communications in Computer and Information Science, vol 1814. Springer, Cham. https://doi.org/10.1007/978-3-031-38854-5_7
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