Scientific Publications of the University of Toulouse II Le Mirail
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Un pays, trois systèmes (Broadway, théâtres régionaux, universités). Singularités de la scène américaine par rapport au modèle français
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Plongez dans l'univers des doctorants DIGISPORT
No full textVideo interview popularizing my work on EUR DIGISPORT’s social mediaIn this second episode, meet Tivizio Pavic, a third-year PhD student who completed the initial modules of the DIGISPORT training program.His research, supervised by Florence Terrade (CERPPS, Université Toulouse - Jean Jaurès) and Geneviève CABAGNO (Laboratoire VIPS2, Université Rennes 2), aims to assess the acceptability and acceptance of a digital system for physical activity compared to in-person care, as well as its effectiveness in improving the quality of life of patients with endometriosis and promoting long-term physical activity.Laboratoire VIPS2 @LP3C Université Rennes 2 Région Bretagne DIGISPOR
Expérience d’atelier de traduction de "Eureka Day" de Jonathan Spector : peut-on traduire l’humour ou faut-il l’adapter?
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Algorithm unrolling for solving inverse problems in signal and image processing
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Childhood trauma and depressive symptoms among orphaned children in Rwanda: parallel mediation by perceived social support and loneliness
No full textInternational audienceBackground Childhood trauma experiences are widely linked with depressive symptoms, especially among orphaned children in low-resource settings like Rwanda. These children often face multiple adversities, increasing their vulnerability to mental health issues. However, the mechanism underlying this relationship remains unclear. Objectives The purpose of this study was to identify the mediating role of perceived social support and loneliness in the relationship between childhood trauma and depressive symptoms. Method A cross-sectional study was conducted on 417 orphaned children aged between 10 and 18 years (M: 13.6, SD: 2.65), conveniently selected from the Gasabo district. Data were collected using standardized instruments to assess loneliness, perceived social support, depression symptoms, and childhood trauma. The data were analyzed using SPSS (Version 29.2); with mediation analyses performed using the PROCESS macro (Version 4.0). Results Individual mediation analysis revealed that perceived social support and loneliness partially mediated the relationship between childhood trauma experiences and depressive symptoms. In the parallel mediation model, both perceived social support and loneliness fully mediated the relationship between childhood trauma experiences and depressive symptoms. Conclusion The findings highlight the significant roles of perceived social support and loneliness as mediators in the relationship between childhood trauma experiences and depressive symptoms. The findings contribute to evidence-based interventions, informing mental health policies, therapeutic strategies, and social support programs tailored to orphaned children
CABLE SOLAR : A Tethered Airborne Platform Dedicated To Solar Cell Characterization
No full textInternational audienceA Tethered Airborne Platform Dedicated To Solar Cell Characterization is presented that could be used ultimately as an Aerostat for Solar Power GenerationPV prototype, electronics for data acquisition and intregration on aerostat were tested with success. The first results are promising and could be associated witha simulation part (LAAS collaboration :https://hal.science/hal-04730979
Identificación de Parámetros de Baterías de Ión-Litio: Un Estudio Comparativo de Diversos Modelos y Técnicas de Optimización para el Modelado de Baterías
No full textInternational audienceThis work presents a comparative study of optimization techniques for parameter identification in equivalent electrical models of lithium-ion batteries. The 2RC model is applied to a set of twelve batteries using four publicly available datasets obtained from well-established research institutions. The methodology is structured in four stages: first, the 2RC model is selected due to its balance between physical interpretability and computational simplicity; second, experimental charge-discharge cycle data are collected; third, various optimization techniques are applied with the aim of minimizing the error between the experimental data and the response estimated by the model; and finally, accuracy is evaluated using the mean squared error, while computational efficiency is assessed through execution time. Traditional, metaheuristic, and bio-inspired optimization methods are considered, including least squares optimization, particle swarm optimization, simulated annealing, and several nature-inspired variants. It is demonstrated that bio-inspired techniques achieve greater accuracy than traditional methods, without a significant increase in computational cost. In particular, particle swarm optimization shows superior performance in terms of precision and robustness against local minima. It is concluded that the integration of advanced optimization strategies significantly enhances the fidelity of equivalent electrical models, which is essential for accurate estimation of internal states such as state of charge, aging, and service life in lithium-ion batteries used in electric vehicles and aerospace systems.En este trabajo se lleva a cabo un estudio comparativo de técnicas de optimización para la identificación de parámetros en modelos eléctricos equivalentes de baterías de ion-litio. Se emplea el modelo 2RC sobre un conjunto de doce baterías, utilizando cuatro bases de datos públicas provenientes de centros de investigación reconocidos. La metodología se estructura en cuatro etapas: en primer lugar, se selecciona el modelo 2RC por su equilibrio entre precisión y simplicidad computacional; en segundo lugar, se recopilan datos experimentales de ciclos de carga y descarga; en tercer lugar, se aplican diversos métodos de optimización con el objetivo de minimizar el error entre los datos experimentales y los resultados estimados por el modelo; y finalmente, se evalúan la precisión, mediante el error cuadrático medio, y la eficiencia computacional, mediante el tiempo de ejecución. Se consideran métodos tradicionales, metaheurísticos y bioinspirados, entre ellos la optimización por mínimos cuadrados, el algoritmo de enjambre de partículas, el recocido simulado y diversas variantes inspiradas en procesos naturales. Se evidencia que las técnicas bioinspiradas permiten alcanzar una mayor precisión que los métodos tradicionales, sin un aumento significativo en el costo computacional. En particular, la optimización por enjambre de partículas muestra un desempeño superior en cuanto a exactitud y robustez frente a mínimos locales. Se concluye que la incorporación de estrategias de optimización avanzadas mejora significativamente la fidelidad de los modelos eléctricos equivalentes, lo que resulta fundamental para una estimación más precisa del estado de carga, el envejecimiento y la vida útil de baterías en aplicaciones críticas, tales como vehículos eléctricos y sistemas aeroespaciales
Movement sonification during haptic exploration shifts emotional outcome without altering texture perception
No full textInternational audienceBackground: Adding movement sonification to haptic exploration can change the perceptual outcome of a textured surface through multisensory processing. We hypothesized that auditory-evoked emotions influence the appraisal of textured surfaces, with corresponding changes reflected in cortical excitability.Methods: Twelve participants actively rubbed two different textured surfaces (slippery and rough) either without movement sonification, or with pleasant or disagreeable movement sonification.Results and discussion: We found that sounds, whether agreeable or disagreeable, did not change the texture appraisal. However, the less pleasant surface was associated with a stronger negative hedonic valence, particularly when paired with disagreeable movement sonification. Time frequency analyses of electroencephalography (EEG) activities revealed a significant reduction in beta-band power [15-25 Hz] within the source-estimated sensorimotor and superior posterior parietal cortices when contrasting both pleasant and unpleasant sounds with the silent touch. This suggests that the primary somatosensory cortices together with the superior parietal regions participated in the audio-tactile binding, with both pleasant and unpleasant sounds. In addition, we observed a significant increase in beta-band power in medial visual areas, specifically when disagreeable movement sonification was paired with tactile exploration. This may reflect a disengagement of visual cortical processing, potentially amplifying auditory-driven emotional responses and intensifying the perceived unpleasantness of the explored surfaces.Conclusion: Our results offer new insights into the neural mechanisms by which hedonic valence of auditory signals modulates emotional processing, without disrupting the perceptual analysis of texture properties
Variation of Dynamic ON-Resistance in SiC and p-GaN HEMTs During DHTOL Operation
No full textInternational audienceWide-bandgap devices offer higher efficiency, faster switching, and better thermal performance than traditional silicon transistors. Their ability to operate at high voltages with lower losses enables compact and efficient power electronics. Since these devices are expected to find application in high/speed and high/performance power converters, their reliability is subject of intense investigation. Particular focus is on the stability of the main parameters, such as ON-resistance (Rds, on), during switching operation. To assess Rds, on stability, this paper discusses the development of a dynamic high-temperature operating life (DHTOL) setup, designed to mimic actual application conditions. The setup utilizes a boost converter to achieve higher stress voltage with a lower input power supply. It consists of two detachable boards: a daughterboard, which contains only the device under test (DUT), and a main board, which contains all the essential components of the converter and clamping circuit. The detachable design facilitates further degradation analysis of the DUTs without disordering the DUT. A thermocouple is mounted close to the thermal pad of the DUT to monitor temperature, which can be used for thermally activated degradation analysis; this is particularly useful, since we did not employ a external heat sink, but just an active cooling (fan). Furthermore, the setup is used to analyze the stability of two different 650 V commercial technologies with similar parameters: trench-based Silicon Carbide (SiC) and p-Gallium Nitride (p-GaN) High Electron Mobility Transistors (HEMTs). The results indicate that the Rds, on of the trench-based SiC device remains stable, whereas the p-GaN HEMT device exhibits a substantial increase in Rds, on after approximately 8 hours at ~50°C
Introduction
No full textInternational audienceIntroduction du 56e congrès de la Société des Historiens Médiévistes de l'Enseignement Supérieur Public, "Chantiers Médiévaux", Albi, mai 2025