2025
Paz-Arbaizar, Leire; Lopez-Castroman, Jorge; Artés-Rodríguez, Antonio; Olmos, Pablo M; Ramírez, David
Emotion Forecasting: A Transformer-Based Approach Artículo de revista
En: J Med Internet Res, vol. 27, pp. e63962, 2025, ISSN: 1438-8871.
Resumen | Enlaces | BibTeX | Etiquetas: affect; emotional valence; machine learning; mental disorder; monitoring; mood; passive data; Patient Health Questionnaire-9; PHQ-9; psychological distress; time-series forecasting
@article{info:doi/10.2196/63962,
title = {Emotion Forecasting: A Transformer-Based Approach},
author = {Leire Paz-Arbaizar and Jorge Lopez-Castroman and Antonio Art\'{e}s-Rodr\'{i}guez and Pablo M Olmos and David Ram\'{i}rez},
url = {https://doi.org/10.2196/63962},
doi = {10.2196/63962},
issn = {1438-8871},
year = {2025},
date = {2025-03-18},
journal = {J Med Internet Res},
volume = {27},
pages = {e63962},
abstract = {Background: Monitoring the emotional states of patients with psychiatric problems has always been challenging due to the noncontinuous nature of clinical assessments, the effect of the health care environment, and the inherent subjectivity of evaluation instruments. However, mental states in psychiatric disorders exhibit substantial variability over time, making real-time monitoring crucial for preventing risky situations and ensuring appropriate treatment. Objective: This study aimed to leverage new technologies and deep learning techniques to enable more objective, real-time monitoring of patients. This was achieved by passively monitoring variables such as step count, patient location, and sleep patterns using mobile devices. We aimed to predict patient self-reports and detect sudden variations in their emotional valence, identifying situations that may require clinical intervention. Methods: Data for this project were collected using the Evidence-Based Behavior (eB2) app, which records both passive and self-reported variables daily. Passive data refer to behavioral information gathered via the eB2 app through sensors embedded in mobile devices and wearables. These data were obtained from studies conducted in collaboration with hospitals and clinics that used eB2. We used hidden Markov models (HMMs) to address missing data and transformer deep neural networks for time-series forecasting. Finally, classification algorithms were applied to predict several variables, including emotional state and responses to the Patient Health Questionnaire-9. Results: Through real-time patient monitoring, we demonstrated the ability to accurately predict patients' emotional states and anticipate changes over time. Specifically, our approach achieved high accuracy (0.93) and a receiver operating characteristic (ROC) area under the curve (AUC) of 0.98 for emotional valence classification. For predicting emotional state changes 1 day in advance, we obtained an ROC AUC of 0.87. Furthermore, we demonstrated the feasibility of forecasting responses to the Patient Health Questionnaire-9, with particularly strong performance for certain questions. For example, in question 9, related to suicidal ideation, our model achieved an accuracy of 0.9 and an ROC AUC of 0.77 for predicting the next day's response. Moreover, we illustrated the enhanced stability of multivariate time-series forecasting when HMM preprocessing was combined with a transformer model, as opposed to other time-series forecasting methods, such as recurrent neural networks or long short-term memory cells. Conclusions: The stability of multivariate time-series forecasting improved when HMM preprocessing was combined with a transformer model, as opposed to other time-series forecasting methods (eg, recurrent neural network and long short-term memory), leveraging the attention mechanisms to capture longer time dependencies and gain interpretability. We showed the potential to assess the emotional state of a patient and the scores of psychiatric questionnaires from passive variables in advance. This allows real-time monitoring of patients and hence better risk detection and treatment adjustment.},
keywords = {affect; emotional valence; machine learning; mental disorder; monitoring; mood; passive data; Patient Health Questionnaire-9; PHQ-9; psychological distress; time-series forecasting},
pubstate = {published},
tppubtype = {article}
}
Background: Monitoring the emotional states of patients with psychiatric problems has always been challenging due to the noncontinuous nature of clinical assessments, the effect of the health care environment, and the inherent subjectivity of evaluation instruments. However, mental states in psychiatric disorders exhibit substantial variability over time, making real-time monitoring crucial for preventing risky situations and ensuring appropriate treatment. Objective: This study aimed to leverage new technologies and deep learning techniques to enable more objective, real-time monitoring of patients. This was achieved by passively monitoring variables such as step count, patient location, and sleep patterns using mobile devices. We aimed to predict patient self-reports and detect sudden variations in their emotional valence, identifying situations that may require clinical intervention. Methods: Data for this project were collected using the Evidence-Based Behavior (eB2) app, which records both passive and self-reported variables daily. Passive data refer to behavioral information gathered via the eB2 app through sensors embedded in mobile devices and wearables. These data were obtained from studies conducted in collaboration with hospitals and clinics that used eB2. We used hidden Markov models (HMMs) to address missing data and transformer deep neural networks for time-series forecasting. Finally, classification algorithms were applied to predict several variables, including emotional state and responses to the Patient Health Questionnaire-9. Results: Through real-time patient monitoring, we demonstrated the ability to accurately predict patients' emotional states and anticipate changes over time. Specifically, our approach achieved high accuracy (0.93) and a receiver operating characteristic (ROC) area under the curve (AUC) of 0.98 for emotional valence classification. For predicting emotional state changes 1 day in advance, we obtained an ROC AUC of 0.87. Furthermore, we demonstrated the feasibility of forecasting responses to the Patient Health Questionnaire-9, with particularly strong performance for certain questions. For example, in question 9, related to suicidal ideation, our model achieved an accuracy of 0.9 and an ROC AUC of 0.77 for predicting the next day's response. Moreover, we illustrated the enhanced stability of multivariate time-series forecasting when HMM preprocessing was combined with a transformer model, as opposed to other time-series forecasting methods, such as recurrent neural networks or long short-term memory cells. Conclusions: The stability of multivariate time-series forecasting improved when HMM preprocessing was combined with a transformer model, as opposed to other time-series forecasting methods (eg, recurrent neural network and long short-term memory), leveraging the attention mechanisms to capture longer time dependencies and gain interpretability. We showed the potential to assess the emotional state of a patient and the scores of psychiatric questionnaires from passive variables in advance. This allows real-time monitoring of patients and hence better risk detection and treatment adjustment.
Conejero, Ismael; Villalba, Miguel Ángel; Matos, Victoria; Jiménez, Oscar; García, Rafael; Albarracín-García, Lucía; Porras-Segovia, Alejandro; Barrigón, María Luisa; Lopez-Castroman, Jorge; Artés-Rodriguez, Antonio; Baca-Garcia, Enrique
Feasibility of digital monitoring in patients receiving ambulatory psychiatric care Artículo de revista
En: Journal of Psychiatric Research, vol. 189, pp. 184-192, 2025, ISSN: 0022-3956.
Resumen | Enlaces | BibTeX | Etiquetas: Ambulatory psychiatric care, Digital monitoring, Feasibility, Naturalistic study
@article{CONEJERO2025184,
title = {Feasibility of digital monitoring in patients receiving ambulatory psychiatric care},
author = {Ismael Conejero and Miguel \'{A}ngel Villalba and Victoria Matos and Oscar Jim\'{e}nez and Rafael Garc\'{i}a and Luc\'{i}a Albarrac\'{i}n-Garc\'{i}a and Alejandro Porras-Segovia and Mar\'{i}a Luisa Barrig\'{o}n and Jorge Lopez-Castroman and Antonio Art\'{e}s-Rodriguez and Enrique Baca-Garcia},
url = {https://www.sciencedirect.com/science/article/pii/S0022395625003723},
doi = {https://doi.org/10.1016/j.jpsychires.2025.05.072},
issn = {0022-3956},
year = {2025},
date = {2025-01-01},
journal = {Journal of Psychiatric Research},
volume = {189},
pages = {184-192},
abstract = {Objective
Monitoring the course of mental disorders in patients receiving ambulatory care may help improve their outcome and reduce complications. For this purpose, smartphone based digital monitoring has been suggested as an effective approach. However, few data exist regarding its feasibility in real-world. In this naturalistic study, we investigated the feasibility of digital monitoring in patients receiving routine ambulatory care and its clinical determinants.
Methods
The clinical characteristics of patients were collected from the electronic clinical records. They included age, gender, diagnosis according to the International Statistical Classification of Diseases and Related Health Problems 10th criteria, and the measurement of severity according to the Clinical Global Impression-Severity scale. Engagement with digital monitoring at baseline was assessed by measuring the installation rate of the eB2 MindCare application on smartphones. The retention time in the digital monitoring (i.e., time until uninstallation and duration of use) was assessed over a 90-day follow-up period.
Results
Among the 212 patients involved in the ambulatory routine clinical follow-up, 148 installed the eB2 MindCare application on their smartphone. Most patients (82.5 %) were retained in the digital monitoring over the 90 days follow-up period. The engagement in the digital monitoring at baseline did not depend upon the clinical characteristics of patients (including age, gender, diagnosis or severity). The overall retention in the digital monitoring was not affected by those clinical characteristics. A diagnosis of impulsive disorder was associated with earlier interruption of the digital monitoring only during the first 90-day period.
Conclusion
Clinical characteristics do not influence engagement in digital monitoring or overall retention. Meanwhile, the diagnosis of impulsive disorders is related with earlier interruption of digital monitoring over the first 3 months. Hence, digital monitoring should be adapted for patients with impulsive disorders to increase their participation and improve their outcome.},
keywords = {Ambulatory psychiatric care, Digital monitoring, Feasibility, Naturalistic study},
pubstate = {published},
tppubtype = {article}
}
Objective
Monitoring the course of mental disorders in patients receiving ambulatory care may help improve their outcome and reduce complications. For this purpose, smartphone based digital monitoring has been suggested as an effective approach. However, few data exist regarding its feasibility in real-world. In this naturalistic study, we investigated the feasibility of digital monitoring in patients receiving routine ambulatory care and its clinical determinants.
Methods
The clinical characteristics of patients were collected from the electronic clinical records. They included age, gender, diagnosis according to the International Statistical Classification of Diseases and Related Health Problems 10th criteria, and the measurement of severity according to the Clinical Global Impression-Severity scale. Engagement with digital monitoring at baseline was assessed by measuring the installation rate of the eB2 MindCare application on smartphones. The retention time in the digital monitoring (i.e., time until uninstallation and duration of use) was assessed over a 90-day follow-up period.
Results
Among the 212 patients involved in the ambulatory routine clinical follow-up, 148 installed the eB2 MindCare application on their smartphone. Most patients (82.5 %) were retained in the digital monitoring over the 90 days follow-up period. The engagement in the digital monitoring at baseline did not depend upon the clinical characteristics of patients (including age, gender, diagnosis or severity). The overall retention in the digital monitoring was not affected by those clinical characteristics. A diagnosis of impulsive disorder was associated with earlier interruption of the digital monitoring only during the first 90-day period.
Conclusion
Clinical characteristics do not influence engagement in digital monitoring or overall retention. Meanwhile, the diagnosis of impulsive disorders is related with earlier interruption of digital monitoring over the first 3 months. Hence, digital monitoring should be adapted for patients with impulsive disorders to increase their participation and improve their outcome.
Monitoring the course of mental disorders in patients receiving ambulatory care may help improve their outcome and reduce complications. For this purpose, smartphone based digital monitoring has been suggested as an effective approach. However, few data exist regarding its feasibility in real-world. In this naturalistic study, we investigated the feasibility of digital monitoring in patients receiving routine ambulatory care and its clinical determinants.
Methods
The clinical characteristics of patients were collected from the electronic clinical records. They included age, gender, diagnosis according to the International Statistical Classification of Diseases and Related Health Problems 10th criteria, and the measurement of severity according to the Clinical Global Impression-Severity scale. Engagement with digital monitoring at baseline was assessed by measuring the installation rate of the eB2 MindCare application on smartphones. The retention time in the digital monitoring (i.e., time until uninstallation and duration of use) was assessed over a 90-day follow-up period.
Results
Among the 212 patients involved in the ambulatory routine clinical follow-up, 148 installed the eB2 MindCare application on their smartphone. Most patients (82.5 %) were retained in the digital monitoring over the 90 days follow-up period. The engagement in the digital monitoring at baseline did not depend upon the clinical characteristics of patients (including age, gender, diagnosis or severity). The overall retention in the digital monitoring was not affected by those clinical characteristics. A diagnosis of impulsive disorder was associated with earlier interruption of the digital monitoring only during the first 90-day period.
Conclusion
Clinical characteristics do not influence engagement in digital monitoring or overall retention. Meanwhile, the diagnosis of impulsive disorders is related with earlier interruption of digital monitoring over the first 3 months. Hence, digital monitoring should be adapted for patients with impulsive disorders to increase their participation and improve their outcome.
Gallego-Viñarás, Lorena; Mira-Tomás, Juan Miguel; Gaeta, Anna Michela; Pinol-Ripoll, Gerard; Barbé, Ferran; Olmos, Pablo M.; Muñoz-Barrutia, Arrate
Alzheimer's Disease Detection in EEG Sleep Signals Artículo de revista
En: IEEE Journal of Biomedical and Health Informatics, vol. 29, no 2, pp. 948-959, 2025.
Enlaces | BibTeX | Etiquetas: Sleep;Electroencephalography;Brain modeling;Databases;Data models;Predictive models;Band-pass filters;Alzheimer's disease;Electrodes;Recording;Alzheimer's disease (AD);Deep Learning (DL);Electroencephalogram (EEG);Mild Cognitive Impairment (MCI);polysomnography (PSG);semi-supervised models
@article{10714019,
title = {Alzheimer's Disease Detection in EEG Sleep Signals},
author = {Lorena Gallego-Vi\~{n}ar\'{a}s and Juan Miguel Mira-Tom\'{a}s and Anna Michela Gaeta and Gerard Pinol-Ripoll and Ferran Barb\'{e} and Pablo M. Olmos and Arrate Mu\~{n}oz-Barrutia},
doi = {10.1109/JBHI.2024.3478380},
year = {2025},
date = {2025-01-01},
journal = {IEEE Journal of Biomedical and Health Informatics},
volume = {29},
number = {2},
pages = {948-959},
keywords = {Sleep;Electroencephalography;Brain modeling;Databases;Data models;Predictive models;Band-pass filters;Alzheimer\'s disease;Electrodes;Recording;Alzheimer\'s disease (AD);Deep Learning (DL);Electroencephalogram (EEG);Mild Cognitive Impairment (MCI);polysomnography (PSG);semi-supervised models},
pubstate = {published},
tppubtype = {article}
}
Lancho, Alejandro; Weiss, Amir; Lee, Gary C. F.; Jayashankar, Tejas; Kurien, Binoy G.; Polyanskiy, Yury; Wornell, Gregory W.
RF Challenge: The Data-Driven Radio Frequency Signal Separation Challenge Artículo de revista
En: IEEE Open Journal of the Communications Society, vol. 6, pp. 4083–4100, 2025, ISSN: 2644-125X.
@article{Lancho_2025,
title = {RF Challenge: The Data-Driven Radio Frequency Signal Separation Challenge},
author = {Alejandro Lancho and Amir Weiss and Gary C. F. Lee and Tejas Jayashankar and Binoy G. Kurien and Yury Polyanskiy and Gregory W. Wornell},
url = {http://dx.doi.org/10.1109/OJCOMS.2025.3556319},
doi = {10.1109/ojcoms.2025.3556319},
issn = {2644-125X},
year = {2025},
date = {2025-01-01},
journal = {IEEE Open Journal of the Communications Society},
volume = {6},
pages = {4083\textendash4100},
publisher = {Institute of Electrical and Electronics Engineers (IEEE)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Paz-Arbaizar, L.; López-Castromán, Jorge; Artés-Rodríguez, A.; Olmos, Pablo M; Ramírez, D.
Emotion forecasting: A transformer-based approach Artículo de revista
En: J. Med. Internet Res., vol. 27, pp. e63962, 2025.
@article{Paz-ArbaizarLopez-CastromanArtes-Rodriguez-2025-Emotionforecastingtransformer-basedapproach,
title = {Emotion forecasting: A transformer-based approach},
author = {L. Paz-Arbaizar and Jorge L\'{o}pez-Castrom\'{a}n and A. Art\'{e}s-Rodr\'{i}guez and Pablo M Olmos and D. Ram\'{i}rez},
doi = {10.2196/63962},
year = {2025},
date = {2025-01-01},
urldate = {2025-01-01},
journal = {J. Med. Internet Res.},
volume = {27},
pages = {e63962},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2024
Ramírez, David; Santamaria, Ignacio; Scharf, Louis L
Passive Detection of a Random Signal Common to Multi-Sensor Reference and Surveillance Arrays Artículo de revista
En: IEEE transactions on vehicular technology., vol. 73, no 7, pp. 10106–10117, 2024, ISSN: 0018-9545.
BibTeX | Etiquetas:
@article{Ram\'{i}rezDavid2024PDoa,
title = {Passive Detection of a Random Signal Common to Multi-Sensor Reference and Surveillance Arrays},
author = {David Ram\'{i}rez and Ignacio Santamaria and Louis L Scharf},
issn = {0018-9545},
year = {2024},
date = {2024-01-01},
journal = {IEEE transactions on vehicular technology.},
volume = {73},
number = {7},
pages = {10106\textendash10117},
publisher = {Institute of Electrical and Electronics Engineers},
address = {New York :},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Miguez, Joaquín; Molina-Bulla, Harold; Mariño, Inés P
Master-slave coupling scheme for synchronization and parameter estimation in the generalized Kuramoto-Sivashinsky equation Artículo de revista
En: Physical review special topics. PRST-AB., vol. 110, no 5, pp. 054206, 2024, ISSN: 2470-0045.
BibTeX | Etiquetas:
@article{MiguezJoaqu\'{i}n2024Mcsf,
title = {Master-slave coupling scheme for synchronization and parameter estimation in the generalized Kuramoto-Sivashinsky equation},
author = {Joaqu\'{i}n Miguez and Harold Molina-Bulla and In\'{e}s P Mari\~{n}o},
issn = {2470-0045},
year = {2024},
date = {2024-01-01},
journal = {Physical review special topics. PRST-AB.},
volume = {110},
number = {5},
pages = {054206},
publisher = {American Physical Society,},
address = {Ridge, N.Y. :},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lopez-Castroman, Jorge; Artés-Rodríguez, Antonio; Courtet, Philippe; Hanon, Cecile; Gondek, Tomasz; Baca-García, Enrique; Volpe, Umberto
The growing need to integrate digital mental health into psychiatric and medical education Artículo de revista
En: European Psychiatry, vol. 67, no 1, pp. e90, 2024.
@article{Lopez-Castroman_Art\'{e}s-Rodr\'{i}guez_Courtet_Hanon_Gondek_Baca-Garc\'{i}a_Volpe_2024,
title = {The growing need to integrate digital mental health into psychiatric and medical education},
author = {Jorge Lopez-Castroman and Antonio Art\'{e}s-Rodr\'{i}guez and Philippe Courtet and Cecile Hanon and Tomasz Gondek and Enrique Baca-Garc\'{i}a and Umberto Volpe},
doi = {10.1192/j.eurpsy.2024.1802},
year = {2024},
date = {2024-01-01},
journal = {European Psychiatry},
volume = {67},
number = {1},
pages = {e90},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Muñiz, Paula; Martínez-García, María; Bailén, Rebeca; Chicano, María; Oarbeascoa, Gillen; Triviño, Juan Carlos; Sebastian, Ismael Iglesia-San; de Córdoba, Sara Fernández; Anguita, Javier; Kwon, Mi; Díez-Martín, José Luis; Olmos, Pablo M.; Martínez-Laperche, Carolina; Buño, Ismael
En: Frontiers in Immunology, vol. Volume 15 - 2024, 2024, ISSN: 1664-3224.
Resumen | Enlaces | BibTeX | Etiquetas:
@article{10.3389/fimmu.2024.1396284,
title = {Identification of predictive models including polymorphisms in cytokines genes and clinical variables associated with post-transplant complications after identical HLA-allogeneic stem cell transplantation},
author = {Paula Mu\~{n}iz and Mar\'{i}a Mart\'{i}nez-Garc\'{i}a and Rebeca Bail\'{e}n and Mar\'{i}a Chicano and Gillen Oarbeascoa and Juan Carlos Trivi\~{n}o and Ismael Iglesia-San Sebastian and Sara Fern\'{a}ndez de C\'{o}rdoba and Javier Anguita and Mi Kwon and Jos\'{e} Luis D\'{i}ez-Mart\'{i}n and Pablo M. Olmos and Carolina Mart\'{i}nez-Laperche and Ismael Bu\~{n}o},
url = {https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2024.1396284},
doi = {10.3389/fimmu.2024.1396284},
issn = {1664-3224},
year = {2024},
date = {2024-01-01},
journal = {Frontiers in Immunology},
volume = {Volume 15 - 2024},
abstract = {\<sec\>\<title\>Backgrounds\</title\>\<p\>Although allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a potentially curative therapy for hematological malignancies, it can be associated with relevant post-transplant complications. Several reports have shown that polymorphisms in immune system genes are correlated with the development of post-transplant complications. Within this context, this work focuses on identifying novel polymorphisms in cytokine genes and developing predictive models to anticipate the risk of developing graft-versus-host disease (GVHD), transplantation-related mortality (TRM), relapse and overall survival (OS).\</p\>\</sec\>\<sec\>\<title\>Methods\</title\>\<p\>Our group developed a 132-cytokine gene panel which was tested in 90 patients who underwent an HLA-identical sibling-donor allo-HSCT. Bayesian logistic regression (BLR) models were used to select the most relevant variables. Based on the cut-off points selected for each model, patients were classified as being at high or low-risk for each of the post-transplant complications (aGVHD II-IV, aGVHD III-IV, cGVHD, mod-sev cGVHD, TRM, relapse and OS).\</p\>\</sec\>\<sec\>\<title\>Results\</title\>\<p\>A total of 737 polymorphisms were selected from the custom panel genes. Of these, 41 polymorphisms were included in the predictive models in 30 cytokine genes were selected (17 interleukins and 13 chemokines). Of these polymorphisms, 5 (12.2%) were located in coding regions, and 36 (87.8%) in non-coding regions. All models had a statistical significance of p\<0.0001.\</p\>\</sec\>\<sec\>\<title\>Conclusion\</title\>\<p\>Overall, genomic polymorphisms in cytokine genes make it possible to anticipate the development all complications studied following allo-HSCT and, consequently, to optimize the clinical management of patients.\</p\>\</sec\>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<sec><title>Backgrounds</title><p>Although allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a potentially curative therapy for hematological malignancies, it can be associated with relevant post-transplant complications. Several reports have shown that polymorphisms in immune system genes are correlated with the development of post-transplant complications. Within this context, this work focuses on identifying novel polymorphisms in cytokine genes and developing predictive models to anticipate the risk of developing graft-versus-host disease (GVHD), transplantation-related mortality (TRM), relapse and overall survival (OS).</p></sec><sec><title>Methods</title><p>Our group developed a 132-cytokine gene panel which was tested in 90 patients who underwent an HLA-identical sibling-donor allo-HSCT. Bayesian logistic regression (BLR) models were used to select the most relevant variables. Based on the cut-off points selected for each model, patients were classified as being at high or low-risk for each of the post-transplant complications (aGVHD II-IV, aGVHD III-IV, cGVHD, mod-sev cGVHD, TRM, relapse and OS).</p></sec><sec><title>Results</title><p>A total of 737 polymorphisms were selected from the custom panel genes. Of these, 41 polymorphisms were included in the predictive models in 30 cytokine genes were selected (17 interleukins and 13 chemokines). Of these polymorphisms, 5 (12.2%) were located in coding regions, and 36 (87.8%) in non-coding regions. All models had a statistical significance of p<0.0001.</p></sec><sec><title>Conclusion</title><p>Overall, genomic polymorphisms in cytokine genes make it possible to anticipate the development all complications studied following allo-HSCT and, consequently, to optimize the clinical management of patients.</p></sec>
Stanton, G.; Ramírez, D.; Santamaría, I.; Scharf, L. L.; Wang, H.
Multi-channel factor analysis: Identifiability and asymptotics Artículo de revista
En: IEEE Trans. Signal Process., vol. 72, pp. 3562–3577, 2024, ISSN: 1053-587X.
@article{StantonRamirezSantamaria-2024-Multi-channelfactoranalysisIdentifiabilityand,
title = {Multi-channel factor analysis: Identifiability and asymptotics},
author = {G. Stanton and D. Ram\'{i}rez and I. Santamar\'{i}a and L. L. Scharf and H. Wang},
doi = {10.1109/TSP.2024.3427004},
issn = {1053-587X},
year = {2024},
date = {2024-01-01},
journal = {IEEE Trans. Signal Process.},
volume = {72},
pages = {3562\textendash3577},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Xiao, Y. -H.; Ramírez, D.; Huang, L.; Li, X. -P.; So, H. C.
One-bit target detection in colocated MIMO radar with colored background noise Artículo de revista
En: IEEE Trans. Signal Process., vol. 72, pp. 5274–5290, 2024, ISSN: 1053-587X.
@article{XiaoRamirezHuang-2024-One-bittargetdetectionincolocated,
title = {One-bit target detection in colocated MIMO radar with colored background noise},
author = {Y. -H. Xiao and D. Ram\'{i}rez and L. Huang and X. -P. Li and H. C. So},
doi = {10.1109/TSP.2024.3484582},
issn = {1053-587X},
year = {2024},
date = {2024-01-01},
journal = {IEEE Trans. Signal Process.},
volume = {72},
pages = {5274\textendash5290},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Wu, P. -W.; Huang, L.; Ramírez, David; Xiao, Y. -H.; So, H. C.
One-bit spectrum sensing for cognitive radio Artículo de revista
En: IEEE Trans. Signal Process., vol. 72, pp. 549–564, 2024, ISSN: 1053-587X.
@article{WuHuangRamirez-2024-One-bitspectrumsensingforcognitive,
title = {One-bit spectrum sensing for cognitive radio},
author = {P. -W. Wu and L. Huang and David Ram\'{i}rez and Y. -H. Xiao and H. C. So},
doi = {10.1109/TSP.2023.3343569},
issn = {1053-587X},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
journal = {IEEE Trans. Signal Process.},
volume = {72},
pages = {549\textendash564},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Porras-Segovia, Alejandro; Granda-Beltrán, Ana Maria De; Gallardo, Claudia; Abascal-Peiró, Sofía; Barrigón, María Luisa; Artés-Rodríguez, Antonio; López-Castroman, Jorge; Courtet, Philippe; Baca-García, Enrique
Smartphone-based safety plan for suicidal crisis: The SmartCrisis 2.0 pilot study Artículo de revista
En: Journal of Psychiatric Research, vol. 169, pp. 284-291, 2024, ISSN: 0022-3956.
Resumen | Enlaces | BibTeX | Etiquetas: Ecological momentary intervention, Experience-sampling method, Suicide, Suicide attempt, Suicide ideation, Time-sampling procedures
@article{PORRASSEGOVIA2024284,
title = {Smartphone-based safety plan for suicidal crisis: The SmartCrisis 2.0 pilot study},
author = {Alejandro Porras-Segovia and Ana Maria De Granda-Beltr\'{a}n and Claudia Gallardo and Sof\'{i}a Abascal-Peir\'{o} and Mar\'{i}a Luisa Barrig\'{o}n and Antonio Art\'{e}s-Rodr\'{i}guez and Jorge L\'{o}pez-Castroman and Philippe Courtet and Enrique Baca-Garc\'{i}a},
url = {https://www.sciencedirect.com/science/article/pii/S0022395623005526},
doi = {https://doi.org/10.1016/j.jpsychires.2023.11.039},
issn = {0022-3956},
year = {2024},
date = {2024-01-01},
journal = {Journal of Psychiatric Research},
volume = {169},
pages = {284-291},
abstract = {Here we present the findings of the pilot phase of the SmartCrisis 2.0 Randomized Clinical Trial. This pilot study aimed to explore the feasibility and acceptability of a safety plan contained in a smartphone app. Our sample consisted patients with a history of recent suicidal behaviour who installed a smartphone-based safety plan. To explore the satisfaction with of the safety plan, two patient satisfaction surveys were conducted: one qualitative and one quantitative. To explore the objective use of the safety plan, we gained access to texts contained in the safety plans completed by the patients. Participation rate was 77%, while 48.9% patients completed both satisfaction surveys at the end of the pilot phase. N = 105 successfully installed the safety plan. In a scale from 1 to 10, users rated the usefulness of the security plan at 7.4, the usability at 8.9, the degree to which they would recommend it to others at 8.6 and the overall satisfaction with the project including evaluations at 9.6. The most widely completed tab was warning signs. Feeling sad or lonely was the warning sign most commonly reported by patients. The second most completed tab was internal coping strategies. Walking or practicing any other exercise was the strategy most commonly resorted to. Our smartphone-based safety plan appears to be a feasible intervention. Data obtained from this pilot study showed high participation rates and high acceptability by patients. This, together with the general satisfaction with the project, supports its implementation in the clinical practice.},
keywords = {Ecological momentary intervention, Experience-sampling method, Suicide, Suicide attempt, Suicide ideation, Time-sampling procedures},
pubstate = {published},
tppubtype = {article}
}
Here we present the findings of the pilot phase of the SmartCrisis 2.0 Randomized Clinical Trial. This pilot study aimed to explore the feasibility and acceptability of a safety plan contained in a smartphone app. Our sample consisted patients with a history of recent suicidal behaviour who installed a smartphone-based safety plan. To explore the satisfaction with of the safety plan, two patient satisfaction surveys were conducted: one qualitative and one quantitative. To explore the objective use of the safety plan, we gained access to texts contained in the safety plans completed by the patients. Participation rate was 77%, while 48.9% patients completed both satisfaction surveys at the end of the pilot phase. N = 105 successfully installed the safety plan. In a scale from 1 to 10, users rated the usefulness of the security plan at 7.4, the usability at 8.9, the degree to which they would recommend it to others at 8.6 and the overall satisfaction with the project including evaluations at 9.6. The most widely completed tab was warning signs. Feeling sad or lonely was the warning sign most commonly reported by patients. The second most completed tab was internal coping strategies. Walking or practicing any other exercise was the strategy most commonly resorted to. Our smartphone-based safety plan appears to be a feasible intervention. Data obtained from this pilot study showed high participation rates and high acceptability by patients. This, together with the general satisfaction with the project, supports its implementation in the clinical practice.
2023
Lancho, Alejandro; Durisi, Giuseppe; Sanguinetti, Luca
Cell-Free Massive MIMO for URLLC: A Finite-Blocklength Analysis Artículo de revista
En: IEEE Transactions on Wireless Communications, vol. 22, no 12, pp. 8723–8735, 2023, ISSN: 1558-2248.
@article{Lancho_2023,
title = {Cell-Free Massive MIMO for URLLC: A Finite-Blocklength Analysis},
author = {Alejandro Lancho and Giuseppe Durisi and Luca Sanguinetti},
url = {http://dx.doi.org/10.1109/TWC.2023.3265303},
doi = {10.1109/twc.2023.3265303},
issn = {1558-2248},
year = {2023},
date = {2023-12-01},
journal = {IEEE Transactions on Wireless Communications},
volume = {22},
number = {12},
pages = {8723\textendash8735},
publisher = {Institute of Electrical and Electronics Engineers (IEEE)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Xiao, Y. -H.; Huang, L.; Ramírez, David; Qian, C.; So, H. C.
Covariance matrix recovery from one-bit data with non-zero quantization thresholds: Algorithm and performance analysis Artículo de revista
En: IEEE Trans. Signal Process., vol. 71, pp. 4060–4076, 2023, ISSN: 1053-587X.
@article{XiaoHuangRamirez-2023-Covariancematrixrecoveryfromone-bit,
title = {Covariance matrix recovery from one-bit data with non-zero quantization thresholds: Algorithm and performance analysis},
author = {Y. -H. Xiao and L. Huang and David Ram\'{i}rez and C. Qian and H. C. So},
doi = {10.1109/TSP.2023.3325664},
issn = {1053-587X},
year = {2023},
date = {2023-11-01},
journal = {IEEE Trans. Signal Process.},
volume = {71},
pages = {4060\textendash4076},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sükei, Emese; Romero-Medrano, Lorena; Leon-Martinez, Santiago; López, Jesús Herrera; Campaña-Montes, Juan José; Olmos, Pablo M; Baca-Garcia, Enrique; Artés, Antonio
Continuous Assessment of Function and Disability via Mobile Sensing: Real-World Data-Driven Feasibility Study Artículo de revista
En: JMIR Form Res, vol. 7, pp. e47167, 2023, ISSN: 2561-326X.
Resumen | Enlaces | BibTeX | Etiquetas: WHODAS; functional limitations; mobile sensing; passive ecological momentary assessment; predictive modeling; interpretable machine learning; machine learning; disability; clinical outcome
@article{info:doi/10.2196/47167b,
title = {Continuous Assessment of Function and Disability via Mobile Sensing: Real-World Data-Driven Feasibility Study},
author = {Emese S\"{u}kei and Lorena Romero-Medrano and Santiago Leon-Martinez and Jes\'{u}s Herrera L\'{o}pez and Juan Jos\'{e} Campa\~{n}a-Montes and Pablo M Olmos and Enrique Baca-Garcia and Antonio Art\'{e}s},
url = {http://www.ncbi.nlm.nih.gov/pubmed/37902823},
doi = {10.2196/47167},
issn = {2561-326X},
year = {2023},
date = {2023-10-30},
journal = {JMIR Form Res},
volume = {7},
pages = {e47167},
abstract = {Background: Functional limitations are associated with poor clinical outcomes, higher mortality, and disability rates, especially in older adults. Continuous assessment of patients' functionality is important for clinical practice; however, traditional questionnaire-based assessment methods are very time-consuming and infrequently used. Mobile sensing offers a great range of sources that can assess function and disability daily. Objective: This work aims to prove the feasibility of an interpretable machine learning pipeline for predicting function and disability based on the World Health Organization Disability Assessment Schedule (WHODAS) 2.0 outcomes of clinical outpatients, using passively collected digital biomarkers. Methods: One-month-long behavioral time-series data consisting of physical and digital activity descriptor variables were summarized using statistical measures (minimum, maximum, mean, median, SD, and IQR), creating 64 features that were used for prediction. We then applied a sequential feature selection to each WHODAS 2.0 domain (cognition, mobility, self-care, getting along, life activities, and participation) in order to find the most descriptive features for each domain. Finally, we predicted the WHODAS 2.0 functional domain scores using linear regression using the best feature subsets. We reported the mean absolute errors and the mean absolute percentage errors over 4 folds as goodness-of-fit statistics to evaluate the model and allow for between-domain performance comparison. Results: Our machine learning\textendashbased models for predicting patients' WHODAS functionality scores per domain achieved an average (across the 6 domains) mean absolute percentage error of 19.5%, varying between 14.86% (self-care domain) and 27.21% (life activities domain). We found that 5-19 features were sufficient for each domain, and the most relevant being the distance traveled, time spent at home, time spent walking, exercise time, and vehicle time. Conclusions: Our findings show the feasibility of using machine learning\textendashbased methods to assess functional health solely from passively sensed mobile data. The feature selection step provides a set of interpretable features for each domain, ensuring better explainability to the models' decisions\textemdashan important aspect in clinical practice.},
keywords = {WHODAS; functional limitations; mobile sensing; passive ecological momentary assessment; predictive modeling; interpretable machine learning; machine learning; disability; clinical outcome},
pubstate = {published},
tppubtype = {article}
}
Background: Functional limitations are associated with poor clinical outcomes, higher mortality, and disability rates, especially in older adults. Continuous assessment of patients' functionality is important for clinical practice; however, traditional questionnaire-based assessment methods are very time-consuming and infrequently used. Mobile sensing offers a great range of sources that can assess function and disability daily. Objective: This work aims to prove the feasibility of an interpretable machine learning pipeline for predicting function and disability based on the World Health Organization Disability Assessment Schedule (WHODAS) 2.0 outcomes of clinical outpatients, using passively collected digital biomarkers. Methods: One-month-long behavioral time-series data consisting of physical and digital activity descriptor variables were summarized using statistical measures (minimum, maximum, mean, median, SD, and IQR), creating 64 features that were used for prediction. We then applied a sequential feature selection to each WHODAS 2.0 domain (cognition, mobility, self-care, getting along, life activities, and participation) in order to find the most descriptive features for each domain. Finally, we predicted the WHODAS 2.0 functional domain scores using linear regression using the best feature subsets. We reported the mean absolute errors and the mean absolute percentage errors over 4 folds as goodness-of-fit statistics to evaluate the model and allow for between-domain performance comparison. Results: Our machine learning–based models for predicting patients' WHODAS functionality scores per domain achieved an average (across the 6 domains) mean absolute percentage error of 19.5%, varying between 14.86% (self-care domain) and 27.21% (life activities domain). We found that 5-19 features were sufficient for each domain, and the most relevant being the distance traveled, time spent at home, time spent walking, exercise time, and vehicle time. Conclusions: Our findings show the feasibility of using machine learning–based methods to assess functional health solely from passively sensed mobile data. The feature selection step provides a set of interpretable features for each domain, ensuring better explainability to the models' decisions—an important aspect in clinical practice.
Sükei, Emese; Romero-Medrano, Lorena; Leon-Martinez, Santiago; López, Jesús Herrera; Campaña-Montes, Juan José; Olmos, Pablo M; Baca-Garcia, Enrique; Artés-Rodríguez, Antonio
Continuous Assessment of Function and Disability via Mobile Sensing: Real-World Data-Driven Feasibility Study Artículo de revista
En: JMIR Form Res, vol. 7, pp. e47167, 2023, ISSN: 2561-326X.
Resumen | Enlaces | BibTeX | Etiquetas: WHODAS; functional limitations; mobile sensing; passive ecological momentary assessment; predictive modeling; interpretable machine learning; machine learning; disability; clinical outcome
@article{info:doi/10.2196/47167,
title = {Continuous Assessment of Function and Disability via Mobile Sensing: Real-World Data-Driven Feasibility Study},
author = {Emese S\"{u}kei and Lorena Romero-Medrano and Santiago Leon-Martinez and Jes\'{u}s Herrera L\'{o}pez and Juan Jos\'{e} Campa\~{n}a-Montes and Pablo M Olmos and Enrique Baca-Garcia and Antonio Art\'{e}s-Rodr\'{i}guez},
url = {http://www.ncbi.nlm.nih.gov/pubmed/37902823},
doi = {10.2196/47167},
issn = {2561-326X},
year = {2023},
date = {2023-10-30},
journal = {JMIR Form Res},
volume = {7},
pages = {e47167},
abstract = {Background: Functional limitations are associated with poor clinical outcomes, higher mortality, and disability rates, especially in older adults. Continuous assessment of patients' functionality is important for clinical practice; however, traditional questionnaire-based assessment methods are very time-consuming and infrequently used. Mobile sensing offers a great range of sources that can assess function and disability daily. Objective: This work aims to prove the feasibility of an interpretable machine learning pipeline for predicting function and disability based on the World Health Organization Disability Assessment Schedule (WHODAS) 2.0 outcomes of clinical outpatients, using passively collected digital biomarkers. Methods: One-month-long behavioral time-series data consisting of physical and digital activity descriptor variables were summarized using statistical measures (minimum, maximum, mean, median, SD, and IQR), creating 64 features that were used for prediction. We then applied a sequential feature selection to each WHODAS 2.0 domain (cognition, mobility, self-care, getting along, life activities, and participation) in order to find the most descriptive features for each domain. Finally, we predicted the WHODAS 2.0 functional domain scores using linear regression using the best feature subsets. We reported the mean absolute errors and the mean absolute percentage errors over 4 folds as goodness-of-fit statistics to evaluate the model and allow for between-domain performance comparison. Results: Our machine learning\textendashbased models for predicting patients' WHODAS functionality scores per domain achieved an average (across the 6 domains) mean absolute percentage error of 19.5%, varying between 14.86% (self-care domain) and 27.21% (life activities domain). We found that 5-19 features were sufficient for each domain, and the most relevant being the distance traveled, time spent at home, time spent walking, exercise time, and vehicle time. Conclusions: Our findings show the feasibility of using machine learning\textendashbased methods to assess functional health solely from passively sensed mobile data. The feature selection step provides a set of interpretable features for each domain, ensuring better explainability to the models' decisions\textemdashan important aspect in clinical practice.},
keywords = {WHODAS; functional limitations; mobile sensing; passive ecological momentary assessment; predictive modeling; interpretable machine learning; machine learning; disability; clinical outcome},
pubstate = {published},
tppubtype = {article}
}
Background: Functional limitations are associated with poor clinical outcomes, higher mortality, and disability rates, especially in older adults. Continuous assessment of patients' functionality is important for clinical practice; however, traditional questionnaire-based assessment methods are very time-consuming and infrequently used. Mobile sensing offers a great range of sources that can assess function and disability daily. Objective: This work aims to prove the feasibility of an interpretable machine learning pipeline for predicting function and disability based on the World Health Organization Disability Assessment Schedule (WHODAS) 2.0 outcomes of clinical outpatients, using passively collected digital biomarkers. Methods: One-month-long behavioral time-series data consisting of physical and digital activity descriptor variables were summarized using statistical measures (minimum, maximum, mean, median, SD, and IQR), creating 64 features that were used for prediction. We then applied a sequential feature selection to each WHODAS 2.0 domain (cognition, mobility, self-care, getting along, life activities, and participation) in order to find the most descriptive features for each domain. Finally, we predicted the WHODAS 2.0 functional domain scores using linear regression using the best feature subsets. We reported the mean absolute errors and the mean absolute percentage errors over 4 folds as goodness-of-fit statistics to evaluate the model and allow for between-domain performance comparison. Results: Our machine learning–based models for predicting patients' WHODAS functionality scores per domain achieved an average (across the 6 domains) mean absolute percentage error of 19.5%, varying between 14.86% (self-care domain) and 27.21% (life activities domain). We found that 5-19 features were sufficient for each domain, and the most relevant being the distance traveled, time spent at home, time spent walking, exercise time, and vehicle time. Conclusions: Our findings show the feasibility of using machine learning–based methods to assess functional health solely from passively sensed mobile data. The feature selection step provides a set of interpretable features for each domain, ensuring better explainability to the models' decisions—an important aspect in clinical practice.
Kislal, A. Oguz; Lancho, Alejandro; Durisi, Giuseppe; Ström, Erik G.
Efficient Evaluation of the Error Probability for Pilot-Assisted URLLC With Massive MIMO Artículo de revista
En: IEEE Journal on Selected Areas in Communications, vol. 41, no 7, pp. 1969–1981, 2023, ISSN: 1558-0008.
@article{Kislal_2023,
title = {Efficient Evaluation of the Error Probability for Pilot-Assisted URLLC With Massive MIMO},
author = {A. Oguz Kislal and Alejandro Lancho and Giuseppe Durisi and Erik G. Str\"{o}m},
url = {http://dx.doi.org/10.1109/JSAC.2023.3280972},
doi = {10.1109/jsac.2023.3280972},
issn = {1558-0008},
year = {2023},
date = {2023-07-01},
journal = {IEEE Journal on Selected Areas in Communications},
volume = {41},
number = {7},
pages = {1969\textendash1981},
publisher = {Institute of Electrical and Electronics Engineers (IEEE)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Barrigon, Maria Luisa; Romero-Medrano, Lorena; Moreno-Muñoz, Pablo; Porras-Segovia, Alejandro; Lopez-Castroman, Jorge; Courtet, Philippe; Artés-Rodríguez, Antonio; Baca-Garcia, Enrique
One-Week Suicide Risk Prediction Using Real-Time Smartphone Monitoring: Prospective Cohort Study Artículo de revista
En: J Med Internet Res, vol. 25, pp. e43719, 2023, ISSN: 1438-8871.
Resumen | Enlaces | BibTeX | Etiquetas: e-health; m-health; Ecological Mometary Asssessment; risk prediction; sensor monitoring; suicidal; suicide attempt; suicide
@article{info:doi/10.2196/43719,
title = {One-Week Suicide Risk Prediction Using Real-Time Smartphone Monitoring: Prospective Cohort Study},
author = {Maria Luisa Barrigon and Lorena Romero-Medrano and Pablo Moreno-Mu\~{n}oz and Alejandro Porras-Segovia and Jorge Lopez-Castroman and Philippe Courtet and Antonio Art\'{e}s-Rodr\'{i}guez and Enrique Baca-Garcia},
url = {http://www.ncbi.nlm.nih.gov/pubmed/37656498},
doi = {10.2196/43719},
issn = {1438-8871},
year = {2023},
date = {2023-05-01},
journal = {J Med Internet Res},
volume = {25},
pages = {e43719},
abstract = {Background: Suicide is a major global public health issue that is becoming increasingly common despite preventive efforts. Though current methods for predicting suicide risk are not sufficiently accurate, technological advances provide invaluable tools with which we may evolve toward a personalized, predictive approach. Objective: We aim to predict the short-term (1-week) risk of suicide by identifying changes in behavioral patterns characterized through real-time smartphone monitoring in a cohort of patients with suicidal ideation. Methods: We recruited 225 patients between February 2018 and March 2020 with a history of suicidal thoughts and behavior as part of the multicenter SmartCrisis study. Throughout 6 months of follow-up, we collected information on the risk of suicide or mental health crises. All participants underwent voluntary passive monitoring using data generated by their own smartphones, including distance walked and steps taken, time spent at home, and app usage. The algorithm constructs daily activity profiles for each patient according to these data and detects changes in the distribution of these profiles over time. Such changes are considered critical periods, and their relationship with suicide-risk events was tested. Results: During follow-up, 18 (8%) participants attempted suicide, and 14 (6.2%) presented to the emergency department for psychiatric care. The behavioral changes identified by the algorithm predicted suicide risk in a time frame of 1 week with an area under the curve of 0.78, indicating good accuracy. Conclusions: We describe an innovative method to identify mental health crises based on passively collected information from patients' smartphones. This technology could be applied to homogeneous groups of patients to identify different types of crises.},
keywords = {e-health; m-health; Ecological Mometary Asssessment; risk prediction; sensor monitoring; suicidal; suicide attempt; suicide},
pubstate = {published},
tppubtype = {article}
}
Background: Suicide is a major global public health issue that is becoming increasingly common despite preventive efforts. Though current methods for predicting suicide risk are not sufficiently accurate, technological advances provide invaluable tools with which we may evolve toward a personalized, predictive approach. Objective: We aim to predict the short-term (1-week) risk of suicide by identifying changes in behavioral patterns characterized through real-time smartphone monitoring in a cohort of patients with suicidal ideation. Methods: We recruited 225 patients between February 2018 and March 2020 with a history of suicidal thoughts and behavior as part of the multicenter SmartCrisis study. Throughout 6 months of follow-up, we collected information on the risk of suicide or mental health crises. All participants underwent voluntary passive monitoring using data generated by their own smartphones, including distance walked and steps taken, time spent at home, and app usage. The algorithm constructs daily activity profiles for each patient according to these data and detects changes in the distribution of these profiles over time. Such changes are considered critical periods, and their relationship with suicide-risk events was tested. Results: During follow-up, 18 (8%) participants attempted suicide, and 14 (6.2%) presented to the emergency department for psychiatric care. The behavioral changes identified by the algorithm predicted suicide risk in a time frame of 1 week with an area under the curve of 0.78, indicating good accuracy. Conclusions: We describe an innovative method to identify mental health crises based on passively collected information from patients' smartphones. This technology could be applied to homogeneous groups of patients to identify different types of crises.
Guerrero-López, Alejandro; Sevilla-Salcedo, Carlos; Candela, Ana; Hernández-García, Marta; Cercenado, Emilia; Olmos, Pablo M.; Cantón, Rafael; Muñoz, Patricia; Gómez-Verdejo, Vanessa; Campo, Rosa; Rodríguez-Sánchez, Belén
Automatic antibiotic resistance prediction in Klebsiella pneumoniae based on MALDI-TOF mass spectra Artículo de revista
En: Engineering Applications of Artificial Intelligence, vol. 118, pp. 105644, 2023, ISSN: 0952-1976.
Resumen | Enlaces | BibTeX | Etiquetas: Antibiotic Resistance, Bayesian model, CP, ESBL, Klebsiella pneumoniae, MALDI-TOF
@article{GUERREROLOPEZ2023105644,
title = {Automatic antibiotic resistance prediction in Klebsiella pneumoniae based on MALDI-TOF mass spectra},
author = {Alejandro Guerrero-L\'{o}pez and Carlos Sevilla-Salcedo and Ana Candela and Marta Hern\'{a}ndez-Garc\'{i}a and Emilia Cercenado and Pablo M. Olmos and Rafael Cant\'{o}n and Patricia Mu\~{n}oz and Vanessa G\'{o}mez-Verdejo and Rosa Campo and Bel\'{e}n Rodr\'{i}guez-S\'{a}nchez},
url = {https://www.sciencedirect.com/science/article/pii/S0952197622006340},
doi = {https://doi.org/10.1016/j.engappai.2022.105644},
issn = {0952-1976},
year = {2023},
date = {2023-01-01},
journal = {Engineering Applications of Artificial Intelligence},
volume = {118},
pages = {105644},
abstract = {Matrix-Assisted Laser Desorption Ionization Time-Of-Flight (MALDI-TOF) Mass Spectrometry (MS) is a reference method for microbial identification and it can be used to predict Antibiotic Resistance (AR) when combined with artificial intelligence methods. However, current solutions need time-costly preprocessing steps, are difficult to reproduce due to hyperparameter tuning, are hardly interpretable, and do not pay attention to epidemiological differences inherent to data coming from different centres, which can be critical. We propose using a multi-view heterogeneous Bayesian model (KSSHIBA) for the prediction of AR using MALDI-TOF MS data together with their epidemiological differences. KSSHIBA is the first model that removes the ad-hoc preprocessing steps that work with raw MALDI-TOF data. In addition, due to its Bayesian probabilistic nature, it does not require hyperparameter tuning, provides interpretable results, and allows exploiting local epidemiological differences between data sources. To test the proposal, we used data from 402 Klebsiella pneumoniae isolates coming from two different domains and 20 different hospitals located in Spain and Portugal. KSSHIBA outperforms current state-of-the-art approaches in antibiotic susceptibility prediction, obtaining a 0.78 AUC score in Wild Type classification and a 0.90 AUC score in Extended-Spectrum Beta-Lactamases (ESBL)+Carbapenemases (CP)-producers. The proposal consistently removes the need for ad-hoc preprocessing by working with raw MALDI-TOF data, which, in turn, reduces the time needed to obtain the results of the resistance mechanism in microbiological laboratories. The proposed model implementation as well as both data domains are publicly available.},
keywords = {Antibiotic Resistance, Bayesian model, CP, ESBL, Klebsiella pneumoniae, MALDI-TOF},
pubstate = {published},
tppubtype = {article}
}
Matrix-Assisted Laser Desorption Ionization Time-Of-Flight (MALDI-TOF) Mass Spectrometry (MS) is a reference method for microbial identification and it can be used to predict Antibiotic Resistance (AR) when combined with artificial intelligence methods. However, current solutions need time-costly preprocessing steps, are difficult to reproduce due to hyperparameter tuning, are hardly interpretable, and do not pay attention to epidemiological differences inherent to data coming from different centres, which can be critical. We propose using a multi-view heterogeneous Bayesian model (KSSHIBA) for the prediction of AR using MALDI-TOF MS data together with their epidemiological differences. KSSHIBA is the first model that removes the ad-hoc preprocessing steps that work with raw MALDI-TOF data. In addition, due to its Bayesian probabilistic nature, it does not require hyperparameter tuning, provides interpretable results, and allows exploiting local epidemiological differences between data sources. To test the proposal, we used data from 402 Klebsiella pneumoniae isolates coming from two different domains and 20 different hospitals located in Spain and Portugal. KSSHIBA outperforms current state-of-the-art approaches in antibiotic susceptibility prediction, obtaining a 0.78 AUC score in Wild Type classification and a 0.90 AUC score in Extended-Spectrum Beta-Lactamases (ESBL)+Carbapenemases (CP)-producers. The proposal consistently removes the need for ad-hoc preprocessing by working with raw MALDI-TOF data, which, in turn, reduces the time needed to obtain the results of the resistance mechanism in microbiological laboratories. The proposed model implementation as well as both data domains are publicly available.
Peis, Ignacio; Olmos, Pablo M; Artés-Rodríguez, Antonio
Unsupervised learning of global factors in deep generative models Artículo de revista
En: Pattern Recognition, vol. 134, pp. 109130, 2023.
BibTeX | Etiquetas:
@article{peis2023unsupervised,
title = {Unsupervised learning of global factors in deep generative models},
author = {Ignacio Peis and Pablo M Olmos and Antonio Art\'{e}s-Rodr\'{i}guez},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Pattern Recognition},
volume = {134},
pages = {109130},
publisher = {Elsevier},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Romero-Medrano, Lorena; Artés-Rodríguez, Antonio
Multi-Source Change-Point Detection over Local Observation Models Artículo de revista
En: Pattern Recognition, vol. 134, pp. 109116, 2023.
BibTeX | Etiquetas:
@article{romero2023multi,
title = {Multi-Source Change-Point Detection over Local Observation Models},
author = {Lorena Romero-Medrano and Antonio Art\'{e}s-Rodr\'{i}guez},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Pattern Recognition},
volume = {134},
pages = {109116},
publisher = {Elsevier},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guerrero-López, Alejandro; Sevilla-Salcedo, Carlos; Candela, Ana; Hernández-García, Marta; Cercenado, Emilia; Olmos, Pablo M; Cantón, Rafael; Muñoz, Patricia; Gómez-Verdejo, Vanessa; Campo, Rosa
Automatic antibiotic resistance prediction in Klebsiella pneumoniae based on MALDI-TOF mass spectra Artículo de revista
En: Engineering Applications of Artificial Intelligence, vol. 118, pp. 105644, 2023.
BibTeX | Etiquetas:
@article{guerrero2023automatic,
title = {Automatic antibiotic resistance prediction in Klebsiella pneumoniae based on MALDI-TOF mass spectra},
author = {Alejandro Guerrero-L\'{o}pez and Carlos Sevilla-Salcedo and Ana Candela and Marta Hern\'{a}ndez-Garc\'{i}a and Emilia Cercenado and Pablo M Olmos and Rafael Cant\'{o}n and Patricia Mu\~{n}oz and Vanessa G\'{o}mez-Verdejo and Rosa Campo},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Engineering Applications of Artificial Intelligence},
volume = {118},
pages = {105644},
publisher = {Elsevier},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Aguilera, Aurora Cobo; Olmos, Pablo M; Artés-Rodríguez, Antonio; Pérez-Cruz, Fernando
Regularizing transformers with deep probabilistic layers Artículo de revista
En: Neural Networks, 2023, ISSN: 0893-6080.
Resumen | Enlaces | BibTeX | Etiquetas: Deep learning, Missing data, Natural language processing, Regularization, Transformers, Variational auto-encoder
@article{AGUILERA2023,
title = {Regularizing transformers with deep probabilistic layers},
author = {Aurora Cobo Aguilera and Pablo M Olmos and Antonio Art\'{e}s-Rodr\'{i}guez and Fernando P\'{e}rez-Cruz},
url = {https://www.sciencedirect.com/science/article/pii/S0893608023000448},
doi = {https://doi.org/10.1016/j.neunet.2023.01.032},
issn = {0893-6080},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Neural Networks},
abstract = {Language models (LM) have grown non-stop in the last decade, from sequence-to-sequence architectures to attention-based Transformers. However, regularization is not deeply studied in those structures. In this work, we use a Gaussian Mixture Variational Autoencoder (GMVAE) as a regularizer layer. We study its advantages regarding the depth where it is placed and prove its effectiveness in several scenarios. Experimental result demonstrates that the inclusion of deep generative models within Transformer-based architectures such as BERT, RoBERTa, or XLM-R can bring more versatile models, able to generalize better and achieve improved imputation score in tasks such as SST-2 and TREC or even impute missing/noisy words with richer text.},
keywords = {Deep learning, Missing data, Natural language processing, Regularization, Transformers, Variational auto-encoder},
pubstate = {published},
tppubtype = {article}
}
Language models (LM) have grown non-stop in the last decade, from sequence-to-sequence architectures to attention-based Transformers. However, regularization is not deeply studied in those structures. In this work, we use a Gaussian Mixture Variational Autoencoder (GMVAE) as a regularizer layer. We study its advantages regarding the depth where it is placed and prove its effectiveness in several scenarios. Experimental result demonstrates that the inclusion of deep generative models within Transformer-based architectures such as BERT, RoBERTa, or XLM-R can bring more versatile models, able to generalize better and achieve improved imputation score in tasks such as SST-2 and TREC or even impute missing/noisy words with richer text.
Sedano-Capdevila, Alba; Toledo-Acosta, Mauricio; Barrigon, María Luisa; Morales-González, Eliseo; Torres-Moreno, David; Martínez-Zaldivar, Bolívar; Hermosillo-Valadez, Jorge; Baca-García, Enrique; Aroca, Fuensanta; Artes-Rodriguez, Antonio; Baca-García, Enrique; Berrouiguet, Sofian; Billot, Romain; Carballo-Belloso, Juan Jose; Courtet, Philippe; Gomez, David Delgado; Lopez-Castroman, Jorge; Rodriguez, Mercedes Perez; Aznar-Carbone, Julia; Cegla, Fanny; Gutiérrez-Recacha, Pedro; Izaguirre-Gamir, Leire; Herrera-Sanchez, Javier; Borja, Marta Migoya; Palomar-Ciria, Nora; Martínez, Adela Sánchez-Escribano; Vasquez, Manuel; Vallejo-Oñate, Silvia; Vera-Varela, Constanza; Amodeo-Escribano, Susana; Arrua, Elsa; Bautista, Olga; Barrigón, Maria Luisa; Carmona, Rodrigo; Caro-Cañizares, Irene; Carollo-Vivian, Sonia; Chamorro, Jaime; González-Granado, Marta; Iza, Miren; Jiménez-Giménez, Mónica; López-Gómez, Ana; Mata-Iturralde, Laura; Miguelez, Carolina; Muñoz-Lorenzo, Laura; Navarro-Jiménez, Rocío; Ovejero, Santiago; Palacios, María Luz; Pérez-Fominaya, Margarita; Peñuelas-Calvo, Inmaculada; Pérez-Colmenero, Sonia; Rico-Romano, Ana; Rodriguez-Jover, Alba; SánchezAlonso, Sergio; Sevilla-Vicente, Juncal; Vigil-López, Carolina; Villoria-Borrego, Lucía; Martin-Calvo, Marisa; Alcón-Durán, Ana; Stasio, Ezequiel Di; García-Vega, Juan Manuel; Martín-Calvo, Pedro; Ortega, Ana José; Segura-Valverde, Marta; Bañón-González, Sara María; Crespo-Llanos, Edurne; Codesal-Julián, Rosana; Frade-Ciudad, Ainara; Merino, Elena Hernando; Álvarez-García, Raquel; Coll-Font, Jose Marcos; Antonio, Pablo Portillo-de; Puras-Rico, Pablo; Sedano-Capdevila, Alba; Serrano-Marugán, Leticia
Text mining methods for the characterisation of suicidal thoughts and behaviour Artículo de revista
En: Psychiatry Research, vol. 322, pp. 115090, 2023, ISSN: 0165-1781.
Resumen | Enlaces | BibTeX | Etiquetas: Machine learning, Mobile health, Natural language processing, Suicidal ideation, Suicide, Suicide attempt
@article{SEDANOCAPDEVILA2023115090,
title = {Text mining methods for the characterisation of suicidal thoughts and behaviour},
author = {Alba Sedano-Capdevila and Mauricio Toledo-Acosta and Mar\'{i}a Luisa Barrigon and Eliseo Morales-Gonz\'{a}lez and David Torres-Moreno and Bol\'{i}var Mart\'{i}nez-Zaldivar and Jorge Hermosillo-Valadez and Enrique Baca-Garc\'{i}a and Fuensanta Aroca and Antonio Artes-Rodriguez and Enrique Baca-Garc\'{i}a and Sofian Berrouiguet and Romain Billot and Juan Jose Carballo-Belloso and Philippe Courtet and David Delgado Gomez and Jorge Lopez-Castroman and Mercedes Perez Rodriguez and Julia Aznar-Carbone and Fanny Cegla and Pedro Guti\'{e}rrez-Recacha and Leire Izaguirre-Gamir and Javier Herrera-Sanchez and Marta Migoya Borja and Nora Palomar-Ciria and Adela S\'{a}nchez-Escribano Mart\'{i}nez and Manuel Vasquez and Silvia Vallejo-O\~{n}ate and Constanza Vera-Varela and Susana Amodeo-Escribano and Elsa Arrua and Olga Bautista and Maria Luisa Barrig\'{o}n and Rodrigo Carmona and Irene Caro-Ca\~{n}izares and Sonia Carollo-Vivian and Jaime Chamorro and Marta Gonz\'{a}lez-Granado and Miren Iza and M\'{o}nica Jim\'{e}nez-Gim\'{e}nez and Ana L\'{o}pez-G\'{o}mez and Laura Mata-Iturralde and Carolina Miguelez and Laura Mu\~{n}oz-Lorenzo and Roc\'{i}o Navarro-Jim\'{e}nez and Santiago Ovejero and Mar\'{i}a Luz Palacios and Margarita P\'{e}rez-Fominaya and Inmaculada Pe\~{n}uelas-Calvo and Sonia P\'{e}rez-Colmenero and Ana Rico-Romano and Alba Rodriguez-Jover and Sergio S\'{a}nchezAlonso and Juncal Sevilla-Vicente and Carolina Vigil-L\'{o}pez and Luc\'{i}a Villoria-Borrego and Marisa Martin-Calvo and Ana Alc\'{o}n-Dur\'{a}n and Ezequiel Di Stasio and Juan Manuel Garc\'{i}a-Vega and Pedro Mart\'{i}n-Calvo and Ana Jos\'{e} Ortega and Marta Segura-Valverde and Sara Mar\'{i}a Ba\~{n}\'{o}n-Gonz\'{a}lez and Edurne Crespo-Llanos and Rosana Codesal-Juli\'{a}n and Ainara Frade-Ciudad and Elena Hernando Merino and Raquel \'{A}lvarez-Garc\'{i}a and Jose Marcos Coll-Font and Pablo Portillo-de Antonio and Pablo Puras-Rico and Alba Sedano-Capdevila and Leticia Serrano-Marug\'{a}n},
url = {https://www.sciencedirect.com/science/article/pii/S0165178123000434},
doi = {https://doi.org/10.1016/j.psychres.2023.115090},
issn = {0165-1781},
year = {2023},
date = {2023-01-01},
journal = {Psychiatry Research},
volume = {322},
pages = {115090},
abstract = {Traditional research methods have shown low predictive value for suicidal risk assessments and limitations to be applied in clinical practice. The authors sought to evaluate natural language processing as a new tool for assessing self-injurious thoughts and behaviors and emotions related. We used MEmind project to assess 2838 psychiatric outpatients. Anonymous unstructured responses to the open-ended question “how are you feeling today?” were collected according to their emotional state. Natural language processing was used to process the patients' writings. The texts were automatically represented (corpus) and analyzed to determine their emotional content and degree of suicidal risk. Authors compared the patients' texts with a question used to assess lack of desire to live, as a suicidal risk assessment tool. Corpus consists of 5,489 short free-text documents containing 12,256 tokenized or unique words. The natural language processing showed an ROC-AUC score of 0.9638 when compared with the responses to lack of a desire to live question. Natural language processing shows encouraging results for classifying subjects according to their desire not to live as a measure of suicidal risk using patients’ free texts. It is also easily applicable to clinical practice and facilitates real-time communication with patients, allowing better intervention strategies to be designed.},
keywords = {Machine learning, Mobile health, Natural language processing, Suicidal ideation, Suicide, Suicide attempt},
pubstate = {published},
tppubtype = {article}
}
Traditional research methods have shown low predictive value for suicidal risk assessments and limitations to be applied in clinical practice. The authors sought to evaluate natural language processing as a new tool for assessing self-injurious thoughts and behaviors and emotions related. We used MEmind project to assess 2838 psychiatric outpatients. Anonymous unstructured responses to the open-ended question “how are you feeling today?” were collected according to their emotional state. Natural language processing was used to process the patients' writings. The texts were automatically represented (corpus) and analyzed to determine their emotional content and degree of suicidal risk. Authors compared the patients' texts with a question used to assess lack of desire to live, as a suicidal risk assessment tool. Corpus consists of 5,489 short free-text documents containing 12,256 tokenized or unique words. The natural language processing showed an ROC-AUC score of 0.9638 when compared with the responses to lack of a desire to live question. Natural language processing shows encouraging results for classifying subjects according to their desire not to live as a measure of suicidal risk using patients’ free texts. It is also easily applicable to clinical practice and facilitates real-time communication with patients, allowing better intervention strategies to be designed.
Moreno-Pino, Fernando; Olmos, Pablo M; Artés-Rodríguez, Antonio
Deep Autoregressive Models with Spectral Attention Artículo de revista
En: Pattern Recognition, pp. 109014, 2023, ISSN: 0031-3203.
Resumen | Enlaces | BibTeX | Etiquetas: Attention models, Deep learning, Filtering, global-local contexts, Signal processing, spectral domain attention, time series forecasting
@article{MORENOPINO2022109014,
title = {Deep Autoregressive Models with Spectral Attention},
author = {Fernando Moreno-Pino and Pablo M Olmos and Antonio Art\'{e}s-Rodr\'{i}guez},
url = {https://www.sciencedirect.com/science/article/pii/S0031320322004940},
doi = {https://doi.org/10.1016/j.patcog.2022.109014},
issn = {0031-3203},
year = {2023},
date = {2023-01-01},
urldate = {2022-01-01},
journal = {Pattern Recognition},
pages = {109014},
abstract = {Time series forecasting is an important problem across many domains, playing a crucial role in multiple real-world applications. In this paper, we propose a forecasting architecture that combines deep autoregressive models with a Spectral Attention (SA) module, which merges global and local frequency domain information in the model’s embedded space. By characterizing in the spectral domain the embedding of the time series as occurrences of a random process, our method can identify global trends and seasonality patterns. Two spectral attention models, global and local to the time series, integrate this information within the forecast and perform spectral filtering to remove time series’s noise. The proposed architecture has a number of useful properties: it can be effectively incorporated into well-known forecast architectures, requiring a low number of parameters and producing explainable results that improve forecasting accuracy. We test the Spectral Attention Autoregressive Model (SAAM) on several well-known forecast datasets, consistently demonstrating that our model compares favorably to state-of-the-art approaches.},
keywords = {Attention models, Deep learning, Filtering, global-local contexts, Signal processing, spectral domain attention, time series forecasting},
pubstate = {published},
tppubtype = {article}
}
Time series forecasting is an important problem across many domains, playing a crucial role in multiple real-world applications. In this paper, we propose a forecasting architecture that combines deep autoregressive models with a Spectral Attention (SA) module, which merges global and local frequency domain information in the model’s embedded space. By characterizing in the spectral domain the embedding of the time series as occurrences of a random process, our method can identify global trends and seasonality patterns. Two spectral attention models, global and local to the time series, integrate this information within the forecast and perform spectral filtering to remove time series’s noise. The proposed architecture has a number of useful properties: it can be effectively incorporated into well-known forecast architectures, requiring a low number of parameters and producing explainable results that improve forecasting accuracy. We test the Spectral Attention Autoregressive Model (SAAM) on several well-known forecast datasets, consistently demonstrating that our model compares favorably to state-of-the-art approaches.
Bonilla-Escribano, Pablo; Ramírez, David; Baca-García, Enrique; Courtet, Philippe; Artés-Rodríguez, Antonio; López-Castromán, Jorge
Multidimensional variability in ecological assessments predicts two clusters of suicidal patients Artículo de revista
En: Scientific reports, vol. 13, no 1, pp. 3546, 2023.
BibTeX | Etiquetas:
@article{bonilla2023multidimensional,
title = {Multidimensional variability in ecological assessments predicts two clusters of suicidal patients},
author = {Pablo Bonilla-Escribano and David Ram\'{i}rez and Enrique Baca-Garc\'{i}a and Philippe Courtet and Antonio Art\'{e}s-Rodr\'{i}guez and Jorge L\'{o}pez-Castrom\'{a}n},
year = {2023},
date = {2023-01-01},
journal = {Scientific reports},
volume = {13},
number = {1},
pages = {3546},
publisher = {Nature Publishing Group UK London},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sükei, Emese; Leon-Martinez, Santiago; Olmos, Pablo M; Artés-Rodríguez, Antonio
Automatic patient functionality assessment from multimodal data using deep learning techniques – Development and feasibility evaluation Artículo de revista
En: Internet Interventions, vol. 33, pp. 100657, 2023, ISSN: 2214-7829.
Resumen | Enlaces | BibTeX | Etiquetas: Attention models, Digital phenotyping, Ecological momentary assessment, In-situ patient monitoring, Time-series modelling, Transfer learning
@article{SUKEI2023100657,
title = {Automatic patient functionality assessment from multimodal data using deep learning techniques \textendash Development and feasibility evaluation},
author = {Emese S\"{u}kei and Santiago Leon-Martinez and Pablo M Olmos and Antonio Art\'{e}s-Rodr\'{i}guez},
url = {https://www.sciencedirect.com/science/article/pii/S221478292300057X},
doi = {https://doi.org/10.1016/j.invent.2023.100657},
issn = {2214-7829},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Internet Interventions},
volume = {33},
pages = {100657},
abstract = {Wearable devices and mobile sensors enable the real-time collection of an abundant source of physiological and behavioural data unobtrusively. Unlike traditional in-person evaluation or ecological momentary assessment (EMA) questionnaire-based approaches, these data sources open many possibilities in remote patient monitoring. However, defining robust models is challenging due to the data's noisy and frequently missing observations. This work proposes an attention-based Long Short-Term Memory (LSTM) neural network-based pipeline for predicting mobility impairment based on WHODAS 2.0 evaluation from such digital biomarkers. Furthermore, we addressed the missing observation problem by utilising hidden Markov models and the possibility of including information from unlabelled samples via transfer learning. We validated our approach using two wearable/mobile sensor data sets collected in the wild and socio-demographic information about the patients. Our results showed that in the WHODAS 2.0 mobility impairment prediction task, the proposed pipeline outperformed a prior baseline while additionally providing interpretability with attention heatmaps. Moreover, using a much smaller cohort via task transfer learning, the same model could learn to predict generalised anxiety severity accurately based on GAD-7 scores.},
keywords = {Attention models, Digital phenotyping, Ecological momentary assessment, In-situ patient monitoring, Time-series modelling, Transfer learning},
pubstate = {published},
tppubtype = {article}
}
Wearable devices and mobile sensors enable the real-time collection of an abundant source of physiological and behavioural data unobtrusively. Unlike traditional in-person evaluation or ecological momentary assessment (EMA) questionnaire-based approaches, these data sources open many possibilities in remote patient monitoring. However, defining robust models is challenging due to the data's noisy and frequently missing observations. This work proposes an attention-based Long Short-Term Memory (LSTM) neural network-based pipeline for predicting mobility impairment based on WHODAS 2.0 evaluation from such digital biomarkers. Furthermore, we addressed the missing observation problem by utilising hidden Markov models and the possibility of including information from unlabelled samples via transfer learning. We validated our approach using two wearable/mobile sensor data sets collected in the wild and socio-demographic information about the patients. Our results showed that in the WHODAS 2.0 mobility impairment prediction task, the proposed pipeline outperformed a prior baseline while additionally providing interpretability with attention heatmaps. Moreover, using a much smaller cohort via task transfer learning, the same model could learn to predict generalised anxiety severity accurately based on GAD-7 scores.
Yela, Alberto López; Míguez, Joaquín
Polynomial Propagation of Moments in Stochastic Differential Equations Artículo de revista
En: SIAM Journal on Applied Dynamical Systems, vol. 22, no 2, pp. 1153-1181, 2023.
Resumen | Enlaces | BibTeX | Etiquetas:
@article{doi:10.1137/21M1431497,
title = {Polynomial Propagation of Moments in Stochastic Differential Equations},
author = {Alberto L\'{o}pez Yela and Joaqu\'{i}n M\'{i}guez},
url = {https://doi.org/10.1137/21M1431497},
doi = {10.1137/21M1431497},
year = {2023},
date = {2023-01-01},
journal = {SIAM Journal on Applied Dynamical Systems},
volume = {22},
number = {2},
pages = {1153-1181},
abstract = {Abstract. We address the problem of approximating the moments of the solution, (boldsymbolX(t)) , of an It\^{o} stochastic differential equation (SDE) with drift and diffusion terms over a time grid (t_0, t_1, …, t_n) . In particular, we assume an explicit numerical scheme for the generation of sample paths (hatboldsymbolX(t_0), hatboldsymbolX(t_1), …, hatboldsymbolX(t_n), …) and then obtain recursive equations that yield any desired noncentral moment of (hatboldsymbolX(t_n)) as a function of the initial condition (hatboldsymbolX(t_0) = boldsymbolX_0) . The core of the methodology is the decomposition of the numerical solution (hatboldsymbolX(t_n)) into a “central part” and an “effective noise” term. The central term is computed deterministically from the ordinary differential equation (ODE) that results from eliminating the diffusion term in the SDE, while the effective noise accounts for the stochastic deviation from the numerical solution of the ODE. For simplicity, we describe the proposed methodology based on an Euler\textendashMaruyama integrator, but other explicit numerical schemes can be exploited in the same way. We also apply the moment approximations to construct estimates of the 1-dimensional marginal probability density functions of (hatboldsymbolX(t_n)) based on a Gram\textendashCharlier expansion. Both for the approximation of moments and 1-dimensional densities, we describe how to handle the cases in which the initial condition is fixed (i.e., (boldsymbolX_0 = boldsymbolx_0) for some deterministic and known (boldsymbolx_0) ) or random. In the latter case, we resort to polynomial chaos expansion (PCE) schemes in order to approximate the target moments. The methodology has been inspired by the PCE and differential algebra methods used for uncertainty propagation in astrodynamics problems. Hence, we illustrate its application for the quantification of uncertainty in a 2-dimensional Keplerian orbit perturbed by a Wiener noise process.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract. We address the problem of approximating the moments of the solution, (boldsymbolX(t)) , of an Itô stochastic differential equation (SDE) with drift and diffusion terms over a time grid (t_0, t_1, …, t_n) . In particular, we assume an explicit numerical scheme for the generation of sample paths (hatboldsymbolX(t_0), hatboldsymbolX(t_1), …, hatboldsymbolX(t_n), …) and then obtain recursive equations that yield any desired noncentral moment of (hatboldsymbolX(t_n)) as a function of the initial condition (hatboldsymbolX(t_0) = boldsymbolX_0) . The core of the methodology is the decomposition of the numerical solution (hatboldsymbolX(t_n)) into a “central part” and an “effective noise” term. The central term is computed deterministically from the ordinary differential equation (ODE) that results from eliminating the diffusion term in the SDE, while the effective noise accounts for the stochastic deviation from the numerical solution of the ODE. For simplicity, we describe the proposed methodology based on an Euler–Maruyama integrator, but other explicit numerical schemes can be exploited in the same way. We also apply the moment approximations to construct estimates of the 1-dimensional marginal probability density functions of (hatboldsymbolX(t_n)) based on a Gram–Charlier expansion. Both for the approximation of moments and 1-dimensional densities, we describe how to handle the cases in which the initial condition is fixed (i.e., (boldsymbolX_0 = boldsymbolx_0) for some deterministic and known (boldsymbolx_0) ) or random. In the latter case, we resort to polynomial chaos expansion (PCE) schemes in order to approximate the target moments. The methodology has been inspired by the PCE and differential algebra methods used for uncertainty propagation in astrodynamics problems. Hence, we illustrate its application for the quantification of uncertainty in a 2-dimensional Keplerian orbit perturbed by a Wiener noise process.
Cano, Alejandro; Pastor, Alejandro; Míguez, Joaquín; Sanjurjo-Rivo, Manuel; Escobar, Diego
Catalog-based atmosphere uncertainty quantification Artículo de revista
En: The Journal of the Astronautical Sciences, vol. 70, no 5, pp. 42, 2023.
BibTeX | Etiquetas:
@article{cano2023catalog,
title = {Catalog-based atmosphere uncertainty quantification},
author = {Alejandro Cano and Alejandro Pastor and Joaqu\'{i}n M\'{i}guez and Manuel Sanjurjo-Rivo and Diego Escobar},
year = {2023},
date = {2023-01-01},
journal = {The Journal of the Astronautical Sciences},
volume = {70},
number = {5},
pages = {42},
publisher = {Springer},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Cano, Alejandro; Pastor, Alejandro; Escobar, Diego; Míguez, Joaquín; Sanjurjo-Rivo, Manuel
Covariance determination for improving uncertainty realism in orbit determination and propagation Artículo de revista
En: Advances in Space Research, vol. 72, no 7, pp. 2759–2777, 2023.
BibTeX | Etiquetas:
@article{cano2023covariance,
title = {Covariance determination for improving uncertainty realism in orbit determination and propagation},
author = {Alejandro Cano and Alejandro Pastor and Diego Escobar and Joaqu\'{i}n M\'{i}guez and Manuel Sanjurjo-Rivo},
year = {2023},
date = {2023-01-01},
journal = {Advances in Space Research},
volume = {72},
number = {7},
pages = {2759\textendash2777},
publisher = {Elsevier},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Galdo, Antía López; Guerrero-López, Alejandro; Olmos, Pablo M; García, María Jesús Gómez
Detecting train driveshaft damages using accelerometer signals and Differential Convolutional Neural Networks Artículo de revista
En: Engineering Applications of Artificial Intelligence, vol. 126, pp. 106840, 2023, ISSN: 0952-1976.
Resumen | Enlaces | BibTeX | Etiquetas: Condition monitoring, Convolutional Neural Networks, Crack detection, Deep learning, Railway axles, Vibration signal
@article{LOPEZGALDO2023106840,
title = {Detecting train driveshaft damages using accelerometer signals and Differential Convolutional Neural Networks},
author = {Ant\'{i}a L\'{o}pez Galdo and Alejandro Guerrero-L\'{o}pez and Pablo M Olmos and Mar\'{i}a Jes\'{u}s G\'{o}mez Garc\'{i}a},
url = {https://www.sciencedirect.com/science/article/pii/S0952197623010242},
doi = {https://doi.org/10.1016/j.engappai.2023.106840},
issn = {0952-1976},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Engineering Applications of Artificial Intelligence},
volume = {126},
pages = {106840},
abstract = {Maintaining railway axles is crucial to prevent catastrophic failures and enormous human and economic costs. In recent years, there has been a growing interest in the railway industry to adopt condition monitoring techniques to enhance the safety and efficiency of the rail transport system, which maintenance is currently based on periodic inspections. In this context, this work presents a technique for real-time crack diagnosis on railway axles, based on advanced 2D-Convolutional Neural Network (CNN) architectures applied to time\textendashfrequency representations of vibration signals. One of the critical novelties is introducing a differential CNN structure that captures the system’s statistical properties, enabling generalisation between different mechanical sets and conditions. The proposed system has been trained with data corresponding to a unique wheelset assembly, showing that the model is able to diagnose cracks on the three different wheelset tested in operation under 32 different combinations of conditions, such as load, speed, sense of rotation and vibration direction. Four different crack levels have been introduced, representing the maximum one a 0.08% of the axle diameter, and the method proposed achieved Area Under the Curve (AUC) score of 0.85, significantly outperforming results obtained with other architectures proposed in the state-of-the-art, the score of the next below is 0.76. The results demonstrate the effectiveness and practicality of this approach to accurately classify the four crack levels tested within a condition monitoring system for non-stationary conditions, that would enable reliable real-time diagnosis, thus paving the way towards a more robust and efficient railway axle maintenance system.},
keywords = {Condition monitoring, Convolutional Neural Networks, Crack detection, Deep learning, Railway axles, Vibration signal},
pubstate = {published},
tppubtype = {article}
}
Maintaining railway axles is crucial to prevent catastrophic failures and enormous human and economic costs. In recent years, there has been a growing interest in the railway industry to adopt condition monitoring techniques to enhance the safety and efficiency of the rail transport system, which maintenance is currently based on periodic inspections. In this context, this work presents a technique for real-time crack diagnosis on railway axles, based on advanced 2D-Convolutional Neural Network (CNN) architectures applied to time–frequency representations of vibration signals. One of the critical novelties is introducing a differential CNN structure that captures the system’s statistical properties, enabling generalisation between different mechanical sets and conditions. The proposed system has been trained with data corresponding to a unique wheelset assembly, showing that the model is able to diagnose cracks on the three different wheelset tested in operation under 32 different combinations of conditions, such as load, speed, sense of rotation and vibration direction. Four different crack levels have been introduced, representing the maximum one a 0.08% of the axle diameter, and the method proposed achieved Area Under the Curve (AUC) score of 0.85, significantly outperforming results obtained with other architectures proposed in the state-of-the-art, the score of the next below is 0.76. The results demonstrate the effectiveness and practicality of this approach to accurately classify the four crack levels tested within a condition monitoring system for non-stationary conditions, that would enable reliable real-time diagnosis, thus paving the way towards a more robust and efficient railway axle maintenance system.
Martínez-García, María; Olmos, Pablo M
Handling Ill-Conditioned Omics Data With Deep Probabilistic Models Artículo de revista
En: IEEE Journal of Biomedical and Health Informatics, vol. 27, no 9, pp. 4601-4610, 2023.
Enlaces | BibTeX | Etiquetas: Data models;Biological system modeling;Probabilistic logic;Bayes methods;Bioinformatics;Mars;Feature extraction;Bayesian;classification;deep generative model;dimensionality reduction;latent space model;missing data;semi-supervised;VAE
@article{10132455,
title = {Handling Ill-Conditioned Omics Data With Deep Probabilistic Models},
author = {Mar\'{i}a Mart\'{i}nez-Garc\'{i}a and Pablo M Olmos},
doi = {10.1109/JBHI.2023.3279493},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {IEEE Journal of Biomedical and Health Informatics},
volume = {27},
number = {9},
pages = {4601-4610},
keywords = {Data models;Biological system modeling;Probabilistic logic;Bayes methods;Bioinformatics;Mars;Feature extraction;Bayesian;classification;deep generative model;dimensionality reduction;latent space model;missing data;semi-supervised;VAE},
pubstate = {published},
tppubtype = {article}
}
Sánchez-Martín, Pablo; Olmos, Pablo M; Perez-Cruz, Fernando
Enhancing diversity in GANs via non-uniform sampling Artículo de revista
En: Information Sciences, vol. 637, pp. 118928, 2023, ISSN: 0020-0255.
Resumen | Enlaces | BibTeX | Etiquetas: Deep generative models, Generative adversarial networks, Mode-collapse
@article{SANCHEZMARTIN2023118928,
title = {Enhancing diversity in GANs via non-uniform sampling},
author = {Pablo S\'{a}nchez-Mart\'{i}n and Pablo M Olmos and Fernando Perez-Cruz},
url = {https://www.sciencedirect.com/science/article/pii/S002002552300498X},
doi = {https://doi.org/10.1016/j.ins.2023.04.007},
issn = {0020-0255},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
journal = {Information Sciences},
volume = {637},
pages = {118928},
abstract = {Recent advances in Generative Adversarial Networks (GANs) have led to impressive results in generating realistic data. However, GANs training is still challenging, often leading to mode-collapse, where a certain type of samples dominates the generated output. To address this issue, we propose a novel training algorithm based on bidirectional GANs (BiGANs) that can be generalized to any implicit generative model. Our algorithm relies on a non-uniform sampling scheme, where data points in a minibatch are sampled with probability inversely proportional to their log-evidence. However, estimating log-evidence is computationally expensive. Instead, we propose to use the reconstruction error, which directly correlates with the log-evidence and only requires a BiGAN network evaluation. Additionally, we combine the aforementioned method with a regularization in the empirical distribution of the encoder that further boosts the performance. Our empirical results show that the proposed methods improve both the quality and diversity of the generated samples.},
keywords = {Deep generative models, Generative adversarial networks, Mode-collapse},
pubstate = {published},
tppubtype = {article}
}
Recent advances in Generative Adversarial Networks (GANs) have led to impressive results in generating realistic data. However, GANs training is still challenging, often leading to mode-collapse, where a certain type of samples dominates the generated output. To address this issue, we propose a novel training algorithm based on bidirectional GANs (BiGANs) that can be generalized to any implicit generative model. Our algorithm relies on a non-uniform sampling scheme, where data points in a minibatch are sampled with probability inversely proportional to their log-evidence. However, estimating log-evidence is computationally expensive. Instead, we propose to use the reconstruction error, which directly correlates with the log-evidence and only requires a BiGAN network evaluation. Additionally, we combine the aforementioned method with a regularization in the empirical distribution of the encoder that further boosts the performance. Our empirical results show that the proposed methods improve both the quality and diversity of the generated samples.
Sükei, Emese; Leon-Martinez, Santiago; Olmos, Pablo; Rodríguez, Antonio Artés
Automatic patient functionality assessment from multimodal data using deep learning techniques – Development and feasibility evaluation Artículo de revista
En: Internet Interventions, vol. 33, pp. 100657, 2023.
@article{articlee,
title = {Automatic patient functionality assessment from multimodal data using deep learning techniques \textendash Development and feasibility evaluation},
author = {Emese S\"{u}kei and Santiago Leon-Martinez and Pablo Olmos and Antonio Art\'{e}s Rodr\'{i}guez},
doi = {10.1016/j.invent.2023.100657},
year = {2023},
date = {2023-01-01},
journal = {Internet Interventions},
volume = {33},
pages = {100657},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2022
Pillitteri, I.; Micela, G; Maggio, A.; Sciortino, S; López-Santiago, J
X-ray variability of HD 189733 across eight years of XMM-Newton observations Artículo de revista
En: Astronomy and Astrophysics, vol. 660, pp. A75, 2022.
Enlaces | BibTeX | Etiquetas: Astrophysics - Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, planetary systems, stars: activity, stars: flare, stars: individual: HD 189733, X-rays: stars
@article{2022A\&A...660A..75P,
title = {X-ray variability of HD 189733 across eight years of XMM-Newton observations},
author = {I. Pillitteri and G Micela and A. Maggio and S Sciortino and J L\'{o}pez-Santiago},
doi = {10.1051/0004-6361/202142232},
year = {2022},
date = {2022-04-01},
urldate = {2022-04-01},
journal = {Astronomy and Astrophysics},
volume = {660},
pages = {A75},
keywords = {Astrophysics - Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, planetary systems, stars: activity, stars: flare, stars: individual: HD 189733, X-rays: stars},
pubstate = {published},
tppubtype = {article}
}
Escudero-Vilaplana, Vicente; Romero-Medrano, Lorena; Villanueva-Bueno, Cristina; de Diago, Marta Rodríguez; Yánez-Montesdeoca, Alberto; Collado-Borrell, Roberto; Campaña-Montes, Juan José; Marzal-Alfaro, Belén; Revuelta-Herrero, José Luis; Calles, Antonio; Galera, Mar; Álvarez, Rosa; Herranz, Ana; Sanjurjo, María; Artés-Rodríguez, Antonio
En: Frontiers in oncology, vol. 12, pp. 880430, 2022, ISSN: 2234-943X.
Resumen | Enlaces | BibTeX | Etiquetas:
@article{PMID:35936756,
title = {Smartphone-Based Ecological Momentary Assessment for the Measurement of the Performance Status and Health-Related Quality of Life in Cancer Patients Under Systemic Anticancer Therapies: Development and Acceptability of a Mobile App},
author = {Vicente Escudero-Vilaplana and Lorena Romero-Medrano and Cristina Villanueva-Bueno and Marta Rodr\'{i}guez de Diago and Alberto Y\'{a}nez-Montesdeoca and Roberto Collado-Borrell and Juan Jos\'{e} Campa\~{n}a-Montes and Bel\'{e}n Marzal-Alfaro and Jos\'{e} Luis Revuelta-Herrero and Antonio Calles and Mar Galera and Rosa \'{A}lvarez and Ana Herranz and Mar\'{i}a Sanjurjo and Antonio Art\'{e}s-Rodr\'{i}guez},
url = {https://europepmc.org/articles/PMC9351705},
doi = {10.3389/fonc.2022.880430},
issn = {2234-943X},
year = {2022},
date = {2022-01-01},
journal = {Frontiers in oncology},
volume = {12},
pages = {880430},
abstract = {\<h4\>Background\</h4\>We have defined a project to develop a mobile app that continually records smartphone parameters which may help define the Eastern Cooperative Oncology Group performance status (ECOG-PS) and the health-related quality of life (HRQoL), without interaction with patients or professionals. This project is divided into 3 phases. Here we describe phase 1. The objective of this phase was to develop the app and assess its usability concerning patient characteristics, acceptability, and satisfaction.\<h4\>Methods\</h4\>The app eB2-ECOG was developed and installed in the smartphone of cancer patients who will be followed for six months. Criteria inclusion were: age over 18-year-old; diagnosed with unresectable or metastatic lung cancer, gastrointestinal stromal tumor, sarcoma, or head and neck cancer; under systemic anticancer therapies; and possession of a Smartphone. The app will collect passive and active data from the patients while healthcare professionals will evaluate the ECOG-PS and HRQoL through conventional tools. Acceptability was assessed during the follow-up. Patients answered a satisfaction survey in the app between 3-6 months from their inclusion.\<h4\>Results\</h4\>The app developed provides a system for continuously collecting, merging, and processing data related to patient's health and physical activity. It provides a transparent capture service based on all the available data of a patient. Currently, 106 patients have been recruited. A total of 36 patients were excluded, most of them (21/36) due to technological reasons. We assessed 69 patients (53 lung cancer, 8 gastrointestinal stromal tumors, 5 sarcomas, and 3 head and neck cancer). Concerning app satisfaction, 70.4% (20/27) of patients found the app intuitive and easy to use, and 51.9% (17/27) of them said that the app helped them to improve and handle their problems better. Overall, 17 out of 27 patients [62.9%] were satisfied with the app, and 14 of them [51.8%] would recommend the app to other patients.\<h4\>Conclusions\</h4\>We observed that the app's acceptability and satisfaction were good, which is essential for the continuity of the project. In the subsequent phases, we will develop predictive models based on the collected information during this phase. We will validate the method and analyze the sensitivity of the automated results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<h4>Background</h4>We have defined a project to develop a mobile app that continually records smartphone parameters which may help define the Eastern Cooperative Oncology Group performance status (ECOG-PS) and the health-related quality of life (HRQoL), without interaction with patients or professionals. This project is divided into 3 phases. Here we describe phase 1. The objective of this phase was to develop the app and assess its usability concerning patient characteristics, acceptability, and satisfaction.<h4>Methods</h4>The app eB2-ECOG was developed and installed in the smartphone of cancer patients who will be followed for six months. Criteria inclusion were: age over 18-year-old; diagnosed with unresectable or metastatic lung cancer, gastrointestinal stromal tumor, sarcoma, or head and neck cancer; under systemic anticancer therapies; and possession of a Smartphone. The app will collect passive and active data from the patients while healthcare professionals will evaluate the ECOG-PS and HRQoL through conventional tools. Acceptability was assessed during the follow-up. Patients answered a satisfaction survey in the app between 3-6 months from their inclusion.<h4>Results</h4>The app developed provides a system for continuously collecting, merging, and processing data related to patient's health and physical activity. It provides a transparent capture service based on all the available data of a patient. Currently, 106 patients have been recruited. A total of 36 patients were excluded, most of them (21/36) due to technological reasons. We assessed 69 patients (53 lung cancer, 8 gastrointestinal stromal tumors, 5 sarcomas, and 3 head and neck cancer). Concerning app satisfaction, 70.4% (20/27) of patients found the app intuitive and easy to use, and 51.9% (17/27) of them said that the app helped them to improve and handle their problems better. Overall, 17 out of 27 patients [62.9%] were satisfied with the app, and 14 of them [51.8%] would recommend the app to other patients.<h4>Conclusions</h4>We observed that the app's acceptability and satisfaction were good, which is essential for the continuity of the project. In the subsequent phases, we will develop predictive models based on the collected information during this phase. We will validate the method and analyze the sensitivity of the automated results.
Porras-Segovia, Alejandro; Moreno, Manon; Barrigón, María Luisa; Castroman, Jorge López; Courtet, Philippe; Berrouiguet, Sofian; Artés-Rodríguez, Antonio; Baca-García, Enrique
Six-month clinical and ecological momentary assessment follow-up of patients at high risk of suicide: a survival analysis Artículo de revista
En: The Journal of Clinical Psychiatry, vol. 84, no 1, pp. 44594, 2022.
BibTeX | Etiquetas:
@article{porras2022six,
title = {Six-month clinical and ecological momentary assessment follow-up of patients at high risk of suicide: a survival analysis},
author = {Alejandro Porras-Segovia and Manon Moreno and Mar\'{i}a Luisa Barrig\'{o}n and Jorge L\'{o}pez Castroman and Philippe Courtet and Sofian Berrouiguet and Antonio Art\'{e}s-Rodr\'{i}guez and Enrique Baca-Garc\'{i}a},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {The Journal of Clinical Psychiatry},
volume = {84},
number = {1},
pages = {44594},
publisher = {Physicians Postgraduate Press, Inc.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Barrigon, Maria Luisa; Porras-Segovia, Alejandro; Courtet, Philippe; Lopez-Castroman, Jorge; Berrouiguet, Sofian; Pérez-Rodríguez, María-Mercedes; Artés-Rodríguez, Antonio; Baca-Garcia, Enrique
Smartphone-based Ecological Momentary Intervention for secondary prevention of suicidal thoughts and behaviour: protocol for the SmartCrisis V. 2.0 randomised clinical trial Artículo de revista
En: BMJ open, vol. 12, no 9, pp. e051807, 2022.
BibTeX | Etiquetas:
@article{barrigon2022smartphone,
title = {Smartphone-based Ecological Momentary Intervention for secondary prevention of suicidal thoughts and behaviour: protocol for the SmartCrisis V. 2.0 randomised clinical trial},
author = {Maria Luisa Barrigon and Alejandro Porras-Segovia and Philippe Courtet and Jorge Lopez-Castroman and Sofian Berrouiguet and Mar\'{i}a-Mercedes P\'{e}rez-Rodr\'{i}guez and Antonio Art\'{e}s-Rodr\'{i}guez and Enrique Baca-Garcia},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {BMJ open},
volume = {12},
number = {9},
pages = {e051807},
publisher = {British Medical Journal Publishing Group},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Cano, Alejandro; Pastor, Alejandro; Fernández, Sergio; Míguez, Joaquín; Sanjurjo-Rivo, Manuel; Escobar, Diego
Improving Orbital Uncertainty Realism Through Covariance Determination in GEO Artículo de revista
En: The Journal of the Astronautical Sciences, vol. 69, no 5, pp. 1394–1420, 2022.
BibTeX | Etiquetas:
@article{cano2022improving,
title = {Improving Orbital Uncertainty Realism Through Covariance Determination in GEO},
author = {Alejandro Cano and Alejandro Pastor and Sergio Fern\'{a}ndez and Joaqu\'{i}n M\'{i}guez and Manuel Sanjurjo-Rivo and Diego Escobar},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {The Journal of the Astronautical Sciences},
volume = {69},
number = {5},
pages = {1394--1420},
publisher = {Springer},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Coll, Andreu Blasco; Vazquez-Vilar, Gonzalo; Fonollosa, Javier Rodríguez
Generalized Perfect Codes for Symmetric Classical-Quantum Channels Artículo de revista
En: IEEE Transactions on Information Theory, vol. 68, no 9, pp. 5923-5936, 2022.
@article{9764678,
title = {Generalized Perfect Codes for Symmetric Classical-Quantum Channels},
author = {Andreu Blasco Coll and Gonzalo Vazquez-Vilar and Javier Rodr\'{i}guez Fonollosa},
doi = {10.1109/TIT.2022.3170868},
year = {2022},
date = {2022-01-01},
journal = {IEEE Transactions on Information Theory},
volume = {68},
number = {9},
pages = {5923-5936},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sevilla-Salcedo, Carlos; Guerrero-López, Alejandro; Olmos, Pablo M; Gómez-Verdejo, Vanessa
Bayesian sparse factor analysis with kernelized observations Artículo de revista
En: Neurocomputing, vol. 490, pp. 66–78, 2022.
BibTeX | Etiquetas:
@article{sevilla2022bayesian,
title = {Bayesian sparse factor analysis with kernelized observations},
author = {Carlos Sevilla-Salcedo and Alejandro Guerrero-L\'{o}pez and Pablo M Olmos and Vanessa G\'{o}mez-Verdejo},
year = {2022},
date = {2022-01-01},
journal = {Neurocomputing},
volume = {490},
pages = {66--78},
publisher = {Elsevier},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sevilla, Paula Muñiz; Martínez-García, María; Kwon, Mi; Bailén, Rebeca; Oarbeascoa, Gillen; Carbonell, Diego; González, Julia Suárez; Lavilla, María Chicano; Andres, Cristina; Triviño, Juan Carlos; Anguita, Javier; Díez-Martín, José Luis; Olmos, Pablo M; Martinez-Laperche, Carolina; Buño, Ismael
En: Blood, vol. 140, no Supplement 1, pp. 4795-4796, 2022, ISSN: 0006-4971.
@article{10.1182/blood-2022-168461,
title = {Identification of Predictive Models Including Polymorphisms in Cytokines Genes Associated with Post-Transplant Complications after Identical HLA-Allogeneic Stem Cell Transplantation},
author = {Paula Mu\~{n}iz Sevilla and Mar\'{i}a Mart\'{i}nez-Garc\'{i}a and Mi Kwon and Rebeca Bail\'{e}n and Gillen Oarbeascoa and Diego Carbonell and Julia Su\'{a}rez Gonz\'{a}lez and Mar\'{i}a Chicano Lavilla and Cristina Andres and Juan Carlos Trivi\~{n}o and Javier Anguita and Jos\'{e} Luis D\'{i}ez-Mart\'{i}n and Pablo M Olmos and Carolina Martinez-Laperche and Ismael Bu\~{n}o},
url = {https://doi.org/10.1182/blood-2022-168461},
doi = {10.1182/blood-2022-168461},
issn = {0006-4971},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Blood},
volume = {140},
number = {Supplement 1},
pages = {4795-4796},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Zhang, Michael Minyi; Williamson, Sinead A.; Perez-Cruz, Fernando
Accelerated parallel non-conjugate sampling for Bayesian non-parametric models Artículo de revista
En: Stat. Comput., vol. 32, no 3, pp. 50, 2022.
BibTeX | Etiquetas:
@article{DBLP:journals/sac/ZhangWP22,
title = {Accelerated parallel non-conjugate sampling for Bayesian non-parametric models},
author = {Michael Minyi Zhang and Sinead A. Williamson and Fernando Perez-Cruz},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Stat. Comput.},
volume = {32},
number = {3},
pages = {50},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pérez-Guillén, C.; Techel, Frank; Hendrick, M.; Volpi, Michele; Herwijnen, A.; Olevski, T.; Obozinski, G.; Perez-Cruz, Fernando; Schweizer, J.
Data-driven automated predictions of the avalanche danger level for dry-snow conditions in Switzerland Artículo de revista
En: Natural Hazards and Earth System Sciences, vol. 22, no 6, pp. 2031–2056, 2022.
@article{nhess-22-2031-2022,
title = {Data-driven automated predictions of the avalanche danger level for dry-snow conditions in Switzerland},
author = {C. P\'{e}rez-Guill\'{e}n and Frank Techel and M. Hendrick and Michele Volpi and A. Herwijnen and T. Olevski and G. Obozinski and Fernando Perez-Cruz and J. Schweizer},
url = {https://nhess.copernicus.org/articles/22/2031/2022/},
doi = {10.5194/nhess-22-2031-2022},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Natural Hazards and Earth System Sciences},
volume = {22},
number = {6},
pages = {2031--2056},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pantoja-Rosero, B. G.; Oner, D.; Kozinski, M.; Achanta, R.; Fua, P.; Perez-Cruz, Fernando; Beyer, K.
TOPO-Loss for continuity-preserving crack detection using deep learning Artículo de revista
En: Construction and Building Materials, vol. 344, pp. 128264, 2022, ISSN: 0950-0618.
Resumen | Enlaces | BibTeX | Etiquetas: Crack detection, Deep learning, Masonry buildings, Post-earthquake assessment
@article{PANTOJAROSERO2022128264,
title = {TOPO-Loss for continuity-preserving crack detection using deep learning},
author = {B. G. Pantoja-Rosero and D. Oner and M. Kozinski and R. Achanta and P. Fua and Fernando Perez-Cruz and K. Beyer},
url = {https://www.sciencedirect.com/science/article/pii/S0950061822019250},
doi = {https://doi.org/10.1016/j.conbuildmat.2022.128264},
issn = {0950-0618},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Construction and Building Materials},
volume = {344},
pages = {128264},
abstract = {We present a method for segmenting cracks in images of masonry buildings damaged by earthquakes. Existing methods of crack detection fail to preserve the continuity of cracks, and their performance deteriorates with imprecise training labels. We address these problems by adapting an approach previously proposed for reconstructing roads in aerial images, in which a Convolutional Neural Network is trained with a loss function specifically designed to encourage the continuity of thin structures and to accommodate imprecise annotations. We evaluate combinations of three loss functions (the Mean Squared Error, the Dice loss and the new connectivity-oriented loss) on two datasets using TernausNet, a deep network shown to attain state-of-the-art accuracy in crack detection. We herein show that combining these three losses significantly improves the topology of the predictions quantitatively and qualitatively. We also propose a new continuity metric, named Cracks Per Patch (CPP), and share a new dataset of images of earthquake-affected urban scenes accompanied by crack annotations. The dataset and implementations are publicly available for future studies and benchmarking (https://github.com/eesd-epfl/topo_crack_detection and https://doi.org/10.5281/zenodo.6769028).},
keywords = {Crack detection, Deep learning, Masonry buildings, Post-earthquake assessment},
pubstate = {published},
tppubtype = {article}
}
We present a method for segmenting cracks in images of masonry buildings damaged by earthquakes. Existing methods of crack detection fail to preserve the continuity of cracks, and their performance deteriorates with imprecise training labels. We address these problems by adapting an approach previously proposed for reconstructing roads in aerial images, in which a Convolutional Neural Network is trained with a loss function specifically designed to encourage the continuity of thin structures and to accommodate imprecise annotations. We evaluate combinations of three loss functions (the Mean Squared Error, the Dice loss and the new connectivity-oriented loss) on two datasets using TernausNet, a deep network shown to attain state-of-the-art accuracy in crack detection. We herein show that combining these three losses significantly improves the topology of the predictions quantitatively and qualitatively. We also propose a new continuity metric, named Cracks Per Patch (CPP), and share a new dataset of images of earthquake-affected urban scenes accompanied by crack annotations. The dataset and implementations are publicly available for future studies and benchmarking (https://github.com/eesd-epfl/topo_crack_detection and https://doi.org/10.5281/zenodo.6769028).
Pantoja-Rosero, B. G.; Achanta, R.; Kozinski, M.; Fua, P.; Perez-Cruz, Fernando; Beyer, K.
Generating LOD3 building models from structure-from-motion and semantic segmentation Artículo de revista
En: Automation in Construction, vol. 141, pp. 104430, 2022, ISSN: 0926-5805.
Resumen | Enlaces | BibTeX | Etiquetas: 3D building models, Deep learning, Digital twin, LOD models, Masonry buildings, Structure from motion
@article{PANTOJAROSERO2022104430,
title = {Generating LOD3 building models from structure-from-motion and semantic segmentation},
author = {B. G. Pantoja-Rosero and R. Achanta and M. Kozinski and P. Fua and Fernando Perez-Cruz and K. Beyer},
url = {https://www.sciencedirect.com/science/article/pii/S092658052200303X},
doi = {https://doi.org/10.1016/j.autcon.2022.104430},
issn = {0926-5805},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Automation in Construction},
volume = {141},
pages = {104430},
abstract = {This paper describes a pipeline for automatically generating level of detail (LOD) models (digital twins), specifically LOD2 and LOD3, from free-standing buildings. Our approach combines structure from motion (SfM) with deep-learning-based segmentation techniques. Given multiple-view images of a building, we compute a three-dimensional (3D) planar abstraction (LOD2 model) of its point cloud using SfM techniques. To obtain LOD3 models, we use deep learning to perform semantic segmentation of the openings in the two-dimensional (2D) images. Unlike existing approaches, we do not rely on complex input, pre-defined 3D shapes or manual intervention. To demonstrate the robustness of our method, we show that it can generate 3D building shapes from a collection of building images with no further input. For evaluating reconstructions, we also propose two novel metrics. The first is a Euclidean\textendashdistance-based correlation of the 3D building model with the point cloud. The second involves re-projecting 3D model facades onto source photos to determine dice scores with respect to the ground-truth masks. Finally, we make the code, the image datasets, SfM outputs, and digital twins reported in this work publicly available in github.com/eesd-epfl/LOD3_buildings and doi.org/10.5281/zenodo.6651663. With this work we aim to contribute research in applications such as construction management, city planning, and mechanical analysis, among others.},
keywords = {3D building models, Deep learning, Digital twin, LOD models, Masonry buildings, Structure from motion},
pubstate = {published},
tppubtype = {article}
}
This paper describes a pipeline for automatically generating level of detail (LOD) models (digital twins), specifically LOD2 and LOD3, from free-standing buildings. Our approach combines structure from motion (SfM) with deep-learning-based segmentation techniques. Given multiple-view images of a building, we compute a three-dimensional (3D) planar abstraction (LOD2 model) of its point cloud using SfM techniques. To obtain LOD3 models, we use deep learning to perform semantic segmentation of the openings in the two-dimensional (2D) images. Unlike existing approaches, we do not rely on complex input, pre-defined 3D shapes or manual intervention. To demonstrate the robustness of our method, we show that it can generate 3D building shapes from a collection of building images with no further input. For evaluating reconstructions, we also propose two novel metrics. The first is a Euclidean–distance-based correlation of the 3D building model with the point cloud. The second involves re-projecting 3D model facades onto source photos to determine dice scores with respect to the ground-truth masks. Finally, we make the code, the image datasets, SfM outputs, and digital twins reported in this work publicly available in github.com/eesd-epfl/LOD3_buildings and doi.org/10.5281/zenodo.6651663. With this work we aim to contribute research in applications such as construction management, city planning, and mechanical analysis, among others.
Chang, Chih-Hua; Peleato, Borja; Wang, Chih-Chun
Coded Caching with Full Heterogeneity: Exact Capacity of The Two-User/Two-File Case Artículo de revista
En: IEEE Transactions on Information Theory, pp. 1-1, 2022.
@article{9791424,
title = {Coded Caching with Full Heterogeneity: Exact Capacity of The Two-User/Two-File Case},
author = {Chih-Hua Chang and Borja Peleato and Chih-Chun Wang},
doi = {10.1109/TIT.2022.3181411},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {IEEE Transactions on Information Theory},
pages = {1-1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Zhang, Ciyuan; Wang, Su; Aggarwal, Vaneet; Peleato, Borja
Coded Caching with Heterogeneous User Profiles Artículo de revista
En: IEEE Transactions on Information Theory, pp. 1-1, 2022.
@article{9805755,
title = {Coded Caching with Heterogeneous User Profiles},
author = {Ciyuan Zhang and Su Wang and Vaneet Aggarwal and Borja Peleato},
doi = {10.1109/TIT.2022.3186210},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {IEEE Transactions on Information Theory},
pages = {1-1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Barrejón, Daniel; Olmos, Pablo M; Artés-Rodríguez, Antonio
Medical Data Wrangling With Sequential Variational Autoencoders Artículo de revista
En: IEEE Journal of Biomedical and Health Informatics, vol. 26, no 6, pp. 2737-2745, 2022.
@article{9594658b,
title = {Medical Data Wrangling With Sequential Variational Autoencoders},
author = {Daniel Barrej\'{o}n and Pablo M Olmos and Antonio Art\'{e}s-Rodr\'{i}guez},
doi = {10.1109/JBHI.2021.3123839},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {IEEE Journal of Biomedical and Health Informatics},
volume = {26},
number = {6},
pages = {2737-2745},
keywords = {},
pubstate = {published},
tppubtype = {article}
}