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  1. Article ; Online: Res-SE-ConvNet

    Talha Ibn Mahmud / Sheikh Asif Imran / Celia Shahnaz

    IEEE Journal of Translational Engineering in Health and Medicine, Vol 10, Pp 1-

    A Deep Neural Network for Hypoxemia Severity Prediction for Hospital In-Patients Using Photoplethysmograph Signal

    2022  Volume 9

    Abstract: Determining the severity level of hypoxemia, the scarcity of saturated oxygen (SpO2) in the human body, is very important for the patients, a matter which has become even more significant during the outbreak of Covid-19 variants. Although the widespread ... ...

    Abstract Determining the severity level of hypoxemia, the scarcity of saturated oxygen (SpO2) in the human body, is very important for the patients, a matter which has become even more significant during the outbreak of Covid-19 variants. Although the widespread usage of Pulse Oximeter has helped the doctors aware of the current level of SpO2 and thereby determine the hypoxemia severity of a particular patient, the high sensitivity of the device can lead to the desensitization of the care-givers, resulting in slower response to actual hypoxemia event. There has been research conducted for the detection of severity level using various parameters and bio-signals and feeding them in a machine learning algorithm. However, in this paper, we have proposed a new residual-squeeze-excitation-attention based convolutional network (Res-SE-ConvNet) using only Photoplethysmography (PPG) signal for the comfortability of the patient. Unlike the other methods, the proposed method has outperformed the standard state-of-art methods as the result shows 96.5% accuracy in determining 3 class severity problems with 0.79 Cohen Kappa score. This method has the potential to aid the patients in receiving the benefit of an automatic and faster clinical decision support system, thus handling the severity of hypoxemia.
    Keywords Saturated oxygen ; attention ; feature map ; excitation ; deep learning ; Computer applications to medicine. Medical informatics ; R858-859.7 ; Medical technology ; R855-855.5
    Subject code 006
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher IEEE
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Application of Electrical Network Frequency of Digital Recordings for Location-Stamp Verification

    Mrinmoy Sarkar / Dhiman Chowdhury / Celia Shahnaz / Shaikh Anowarul Fattah

    Applied Sciences, Vol 9, Iss 15, p

    2019  Volume 3135

    Abstract: Electrical network frequency (ENF) is a signature of a power distribution grid. It represents the deviation from the nominal frequency (50 or 60 Hz) of a power system network. The variations in ENF sequences within a grid are subject to load fluctuations ...

    Abstract Electrical network frequency (ENF) is a signature of a power distribution grid. It represents the deviation from the nominal frequency (50 or 60 Hz) of a power system network. The variations in ENF sequences within a grid are subject to load fluctuations within that particular grid. These ENF variations are inherently located in a multimedia signal, which is recorded close to the grid or directly from the mains power line. Thus, the specific location of a recording can be identified by analyzing the ENF sequences of the multimedia signal in absence of the concurrent power signal. In this article, a novel approach to location-stamp authentication based on ENF sequences of digital recordings is presented. ENF patterns are extracted from a number of power and audio signals recorded in different grid locations across the world. The extracted ENF signals are decomposed into low outliers and high outliers frequency segments and potential feature vectors are determined for these ENF segments by statistical and signal processing analysis. Then, a multi-class support vector machine (SVM) classification model is developed to verify the location-stamp information of the recordings. The performance evaluations corroborate the efficacy of the proposed framework.
    Keywords digital recordings ; electrical network frequency (ENF) ; feature vectors ; location-stamp ; root MUSIC ; SVM classifier ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 621
    Language English
    Publishing date 2019-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Teager Energy Operation on Wavelet Packet Coefficients for Enhancing Noisy Speech Using a Hard Thresholding Function

    Tahsina Farah Sanam / Celia Shahnaz

    Signal Processing : An International Journal , Vol 6, Iss 2, Pp 22-

    2012  Volume 43

    Abstract: In this paper a new thresholding based speech enhancement approach is presented, where the threshold is statistically determined by employing the Teager energy operation on the Wavelet Packet (WP) coefficients of noisy speech. The threshold thus obtained ...

    Abstract In this paper a new thresholding based speech enhancement approach is presented, where the threshold is statistically determined by employing the Teager energy operation on the Wavelet Packet (WP) coefficients of noisy speech. The threshold thus obtained is applied on the WP coefficients of the noisy speech by using a hard thresholding function in order to obtain an enhanced speech. Detailed simulations are carried out in the presence of white, car, pink, and babble noises to evaluate the performance of the proposed method. Standard objective measures, spectrogram representations and subjective listening tests show that the proposed method outperforms the existing state-of-the-art thresholding based speech enhancement approaches for noisy speech from high to low levels of SNR.
    Keywords Teager Energy Operator ; Statistical Modeling ; Thrsholding Function ; Wavelet Packet Transform ; Science ; Q ; Mathematics ; QA1-939 ; Instruments and machines ; QA71-90 ; Electronic computers. Computer science ; QA75.5-76.95
    Subject code 006
    Publishing date 2012-04-01T00:00:00Z
    Publisher Computer Science Journals
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Teager Energy Operation on Wavelet Packet Coefficients for Enhancing Noisy Speech Using a Hard Thresholding Function

    Tahsina Farah Sanam / Celia Shahnaz

    Signal Processing : An International Journal , Vol 6, Iss 2, Pp 22-

    2012  Volume 43

    Abstract: In this paper a new thresholding based speech enhancement approach is presented, where thethreshold is statistically determined by employing the Teager energy operation on the Wavelet Packet(WP) coefficients of noisy speech. The threshold thus obtained ... ...

    Abstract In this paper a new thresholding based speech enhancement approach is presented, where thethreshold is statistically determined by employing the Teager energy operation on the Wavelet Packet(WP) coefficients of noisy speech. The threshold thus obtained is applied on the WP coefficients ofthe noisy speech by using a hard thresholding function in order to obtain an enhanced speech.Detailed simulations are carried out in the presence of white, car, pink, and babble noises to evaluatethe performance of the proposed method. Standard objective measures, spectrogram representationsand subjective listening tests show that the proposed method outperforms the existing state-of-the-artthresholding based speech enhancement approaches for noisy speech from high to low levels ofSNR.
    Keywords Teager Energy Operator ; Wavelet Packet Transform ; Statistical Modeling ; Thrsholding Function ; Electronic computers. Computer science ; QA75.5-76.95 ; Instruments and machines ; QA71-90 ; Mathematics ; QA1-939 ; Science ; Q ; DOAJ:Computer Science ; DOAJ:Technology and Engineering
    Language English
    Publishing date 2012-04-01T00:00:00Z
    Publisher Computer Science Journals
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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