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167 results on '"Mengarelli, Alessandro"'

3. Intelligent Human–Computer Interaction: Combined Wrist and Forearm Myoelectric Signals for Handwriting Recognition.

Author

Tigrini, Andrea, Ranaldi, Simone, Verdini, Federica, Mobarak, Rami, Scattolini, Mara, Conforto, Silvia, Schmid, Maurizio, Burattini, Laura, Gambi, Ennio, Fioretti, Sandro, and Mengarelli, Alessandro

Subjects
WRIST, PATTERN recognition systems, FISHER discriminant analysis, HUMAN-computer interaction, HANDWRITING, FOREARM, MYOELECTRIC prosthesis, MACHINE learning
Abstract

Recent studies have highlighted the possibility of using surface electromyographic (EMG) signals to develop human–computer interfaces that are also able to recognize complex motor tasks involving the hand as the handwriting of digits. However, the automatic recognition of words from EMG information has not yet been studied. The aim of this study is to investigate the feasibility of using combined forearm and wrist EMG probes for solving the handwriting recognition problem of 30 words with consolidated machine-learning techniques and aggregating state-of-the-art features extracted in the time and frequency domains. Six healthy subjects, three females and three males aged between 25 and 40 years, were recruited for the study. Two tests in pattern recognition were conducted to assess the possibility of classifying fine hand movements through EMG signals. The first test was designed to assess the feasibility of using consolidated myoelectric control technology with shallow machine-learning methods in the field of handwriting detection. The second test was implemented to assess if specific feature extraction schemes can guarantee high performances with limited complexity of the processing pipeline. Among support vector machine, linear discriminant analysis, and K-nearest neighbours (KNN), the last one showed the best classification performances in the 30-word classification problem, with a mean accuracy of 95% and 85% when using all the features and a specific feature set known as TDAR, respectively. The obtained results confirmed the validity of using combined wrist and forearm EMG data for intelligent handwriting recognition through pattern recognition approaches in real scenarios. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Muscular Co-contraction Detection: A Wavelet Coherence Approach

Author

Strazza, Annachiara, Verdini, Federica, Tigrini, Andrea, Cardarelli, Stefano, Mengarelli, Alessandro, Fioretti, Sandro, Di Nardo, Francesco, Magjarevic, Ratko, Series Editor, Ładyżyński, Piotr, Associate Editor, Ibrahim, Fatimah, Associate Editor, Lackovic, Igor, Associate Editor, Rock, Emilio Sacristan, Associate Editor, Henriques, Jorge, editor, Neves, Nuno, editor, and de Carvalho, Paulo, editor

Published
2020
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7. Wavelet Analysis-Based Reconstruction for sEMG Signal Denoising

Author

Strazza, Annachiara, Verdini, Federica, Mengarelli, Alessandro, Cardarelli, Stefano, Tigrini, Andrea, Fioretti, Sandro, Di Nardo, Francesco, Magjarevic, Ratko, Series Editor, Ładyżyński, Piotr, Associate Editor, Ibrahim, Fatimah, Associate Editor, Lackovic, Igor, Associate Editor, Rock, Emilio Sacristan, Associate Editor, Henriques, Jorge, editor, Neves, Nuno, editor, and de Carvalho, Paulo, editor

Published
2020
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8. Co-activation of Knee Muscles in Female vs. Male Adults

Author

Di Nardo, Francesco, Strazza, Annachiara, Tigrini, Andrea, Mascia, Guido, Cardarelli, Stefano, Mengarelli, Alessandro, Verdini, Federica, Fioretti, Sandro, Magjarevic, Ratko, Series Editor, Ładyżyński, Piotr, Associate Editor, Ibrahim, Fatimah, Associate Editor, Lackovic, Igor, Associate Editor, Rock, Emilio Sacristan, Associate Editor, Henriques, Jorge, editor, Neves, Nuno, editor, and de Carvalho, Paulo, editor

Published
2020
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10. Gait Asymmetry in Winters Group I Hemiplegic Children: Role of Tibialis Anterior

Author

Di Nardo, Francesco, Mengarelli, Alessandro, Strazza, Annachiara, Malavolta, Marta, Verdini, Federica, Cardarelli, Stefano, Burattini, Laura, Nascimbeni, Alberto, Fioretti, Sandro, Magjarevic, Ratko, Editor-in-Chief, Ładyżyński, Piotr, Series Editor, Ibrahim, Fatimah, Series Editor, Lacković, Igor, Series Editor, Rock, Emilio Sacristan, Series Editor, Lhotska, Lenka, editor, Sukupova, Lucie, editor, and Ibbott, Geoffrey S., editor

Published
2019
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11. A Sliding Mode Control Model for Perturbed Upright Stance in Healthy Subjects

Author

Mengarelli, Alessandro, Fioretti, Sandro, Orlando, Giuseppe, Cardarelli, Stefano, Fioretti, Ismaele, Paci, Gian Marco, Burattini, Laura, Di Nardo, Francesco, Strazza, Annachiara, Verdini, Federica, Magjarevic, Ratko, Editor-in-Chief, Ładyżyński, Piotr, Series Editor, Ibrahim, Fatimah, Series Editor, Lacković, Igor, Series Editor, Rock, Emilio Sacristan, Series Editor, Lhotska, Lenka, editor, Sukupova, Lucie, editor, and Ibbott, Geoffrey S., editor

Published
2019
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12. Role of the Visual Feedback on Balance Responses to Upright Stance Perturbations

Author

Mengarelli, Alessandro, Cardarelli, Stefano, Fioretti, Sandro, Strazza, Annachiara, Tigrini, Andrea, Di Nardo, Francesco, Burattini, Laura, Verdini, Federica, Magjarevic, Ratko, Editor-in-Chief, Ładyżyński, Piotr, Series Editor, Ibrahim, Fatimah, Series Editor, Lacković, Igor, Series Editor, Rock, Emilio Sacristan, Series Editor, Lhotska, Lenka, editor, Sukupova, Lucie, editor, and Ibbott, Geoffrey S., editor

Published
2019
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13. Position Estimation of an IMU Placed on Pelvis Through Meta-heuristically Optimised WFLC

Author

Cardarelli, Stefano, Verdini, Federica, Mengarelli, Alessandro, Strazza, Annachiara, Di Nardo, Francesco, Burattini, Laura, Fioretti, Sandro, Magjarevic, Ratko, Editor-in-Chief, Ładyżyński, Piotr, Series Editor, Ibrahim, Fatimah, Series Editor, Lacković, Igor, Series Editor, Rock, Emilio Sacristan, Series Editor, Lhotska, Lenka, editor, Sukupova, Lucie, editor, and Ibbott, Geoffrey S., editor

Published
2019
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14. A Time-Frequency Approach for the Assessment of Dynamic Muscle Co-contractions

Author

Strazza, Annachiara, Verdini, Federica, Mengarelli, Alessandro, Cardarelli, Stefano, Burattini, Laura, Fioretti, Sandro, Di Nardo, Francesco, Magjarevic, Ratko, Editor-in-Chief, Ładyżyński, Piotr, Series Editor, Ibrahim, Fatimah, Series Editor, Lacković, Igor, Series Editor, Rock, Emilio Sacristan, Series Editor, Lhotska, Lenka, editor, Sukupova, Lucie, editor, and Ibbott, Geoffrey S., editor

Published
2019
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15. Are Extensor Digitorum Brevis and Gastrocnemius Working Together? Surface EMG Analysis in Healthy Children

Author

Di Nardo, Francesco, Strazza, Annachiara, Palmieri, Michela Sara, Mengarelli, Alessandro, Cardarelli, Stefano, Burattini, Laura, Orsini, Ornella, Verdini, Federica, Bortone, Antonio, Fioretti, Sandro, Magjarevic, Ratko, Editor-in-Chief, Ładyżyński, Piotr, Series Editor, Ibrahim, Fatimah, Series Editor, Lacković, Igor, Series Editor, Rock, Emilio Sacristan, Series Editor, Lhotska, Lenka, editor, Sukupova, Lucie, editor, and Ibbott, Geoffrey S., editor

Published
2019
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16. Center of Pressure based Assessment of Balance Responses to Repeated Perturbations of Upright Stance

Author

Mengarelli, Alessandro, Cardarelli, Stefano, Fioretti, Sandro, Burattini, Laura, Di Nardo, Francesco, Verdini, Federica, Magjarevic, Ratko, Editor-in-chief, Ładyżyński, Piotr, Series editor, Ibrahim, Fatimah, Series editor, Lacković, Igor, Series editor, Rock, Emilio Sacristan, Series editor, Eskola, Hannu, editor, Väisänen, Outi, editor, Viik, Jari, editor, and Hyttinen, Jari, editor

Published
2018
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17. Ankle Muscles Co-Activation Patterns During Normal Gait: An Amplitude Evaluation

Author

Cardarelli, Stefano, Gentili, Andrea, Mengarelli, Alessandro, Verdini, Federica, Fioretti, Sandro, Burattini, Laura, Di Nardo, Francesco, Magjarevic, Ratko, Editor-in-chief, Ładyżyński, Piotr, Series editor, Ibrahim, Fatimah, Series editor, Lacković, Igor, Series editor, Rock, Emilio Sacristan, Series editor, Eskola, Hannu, editor, Väisänen, Outi, editor, Viik, Jari, editor, and Hyttinen, Jari, editor

Published
2018
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20. Co-activation of Knee Muscles in Female vs. Male Adults

Author

Di Nardo, Francesco, primary, Strazza, Annachiara, additional, Tigrini, Andrea, additional, Mascia, Guido, additional, Cardarelli, Stefano, additional, Mengarelli, Alessandro, additional, Verdini, Federica, additional, and Fioretti, Sandro, additional

Published
2019
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23. Are the Rectus Femoris and the Vastus Lateralis Concurrently Recruited During Walking?

Author

Di Nardo, Francesco, Mengarelli, Alessandro, Strazza, Annachiara, Maranesi, Elvira, Burattini, Laura, Fioretti, Sandro, Magjarevic, Ratko, Editor-in-chief, Ładyżyński, Piotr, Series editor, Ibrahim, Fatimah, Series editor, Lacković, Igor, Series editor, Rock, Emilio Sacristan, Series editor, Kyriacou, Efthyvoulos, editor, Christofides, Stelios, editor, and Pattichis, Constantinos S., editor

Published
2016
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42. Neuromuscular Control Modelling of Human Perturbed Posture Through Piecewise Affine Autoregressive With Exogenous Input Models

Author

Tigrini, Andrea, Verdini, Federica, Maiolatesi, Marco, Monteriù, Andrea, Ferracuti, Francesco, Fioretti, Sandro, Longhi, Sauro, and Mengarelli, Alessandro

Subjects
Histology, neuromuscular control, cognitive load, Biomedical Engineering, Bioengineering and Biotechnology, Bioengineering, perturbed posture, piecewise affine autoregressive with exogenous inputs, TP248.13-248.65, Original Research, system identification, Biotechnology
Abstract

In this study, the neuromuscular control modeling of the perturbed human upright stance is assessed through piecewise affine autoregressive with exogenous input (PWARX) models. Ten healthy subjects underwent an experimental protocol where visual deprivation and cognitive load are applied to evaluate whether PWARX can be used for modeling the role of the central nervous system (CNS) in balance maintenance in different conditions. Balance maintenance is modeled as a single-link inverted pendulum; and kinematic, dynamic, and electromyography (EMG) data are used to fit the PWARX models of the CNS activity. Models are trained on 70% and tested on the 30% of unseen data belonging to the remaining dataset. The models are able to capture which factors the CNS is subjected to, showing a fitting accuracy higher than 90% for each experimental condition. The models present a switch between two different control dynamics, coherent with the physiological response to a sudden balance perturbation and mirrored by the data-driven lag selection for data time series. The outcomes of this study indicate that hybrid postural control policies, yet investigated for unperturbed stance, could be an appropriate motor control paradigm when balance maintenance undergoes external disruption.

Published
2022

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