Portail HAL UHA (Université de Haute-Alsace)
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Establishing a unified evaluation framework for human motion generation: A comparative analysis of metrics
No full textInternational audienceThe development of generative artificial intelligence for human motion generation has expanded rapidly, necessitating a unified evaluation framework. This paper presents a detailed review of eight evaluation metrics for human motion generation, highlighting their unique features and shortcomings. We propose standardized practices through a unified evaluation setup to facilitate consistent model comparisons. Additionally, we introduce a novel metric that assesses diversity in temporal distortion by analyzing warping diversity, thereby enhancing the evaluation of temporal data. We also conduct experimental analyses of three generative models using two publicly available datasets, offering insights into the interpretation of each metric in specific case scenarios. Our goal is to offer a clear, user-friendly evaluation framework for newcomers, complemented by publicly accessible code: https://github.com/MSD-IRIMAS/Evaluating-HMG
Éprouver la cohabitation culturelle, ses enjeux (in)communicationnels et socio-politiques. La voix des ONG en contexte polarisé
No full textInternational audienceThis text is based on the inaugural lecture delivered by the author on May 21, 2025, at the General Assembly of CRÉSAT. Johanne Samè presents the central notion underpinning her research: cultural cohabitation, approached as a social, political, and (in)communicational issue. Drawing on ethnographic fieldwork conducted within la Cimade, a French NGO committed to defending the rights of migrants, she explores how civil society actors attempt to produce alternative narratives in a context marked by growing polarization and the normalization of xenophobic and racist discourse. The analysis highlights the strategies deployed to make their voices heard in public arenas, in the face of stigmatization, rejection, and algorithmic dynamics that constrain their visibility in both traditional and socionumeric media. Ultimately, this lesson offers a critical reading of living together, paying attention to regimes of enunciation, power relations and contemporary mediation dispositifs.Ce texte est issu de la leçon inaugurale prononcée par l’auteure le 21 mai 2025 lors de l’Assemblée générale du CRÉSAT. Johanne Samè y présente la notion centrale qui traverse sa recherche : celle de la cohabitation culturelle, envisagée comme un enjeu à la fois social, politique et (in)communicationnel. À partir d’une enquête ethnographique menée au sein de la Cimade, une ONG française engagée dans la défense des droits des personnes migrantes, elle explore la manière dont les acteurs de la société civile tentent de produire des récits alternatifs dans un contexte de polarisation croissante et de normalisation des discours xénophobes et racistes. L’analyse met en lumière les stratégies mises en œuvre pour faire entendre leur voix dans les espaces publics, face à la stigmatisation, au rejet, ainsi qu’aux logiques algorithmiques qui entravent leur visibilité dans les médias traditionnels et socionumériques. Cette leçon propose in fine une lecture critique du vivre-ensemble, attentive aux régimes d’énonciation, aux rapports de pouvoir et aux dispositifs contemporains de médiation
Influence of finger movement direction on friction-induced vibrations and perception of textured surfaces
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Fast hybrid FNN-GPR modeling for state of health estimation in Lithium-ion cells using early charge data: addressing performance variability
No full textInternational audienceAccurate State of Health (SOH) estimation is essential for optimizing lithium-ion battery performance, especially in second-life applications. This paper introduces a fast SOH estimation method using the first 10 seconds of charge voltage data, followed by polynomial regression to extract features for AI algorithms. A hybrid model combining Feed-Forward Neural Networks (FNN) and Gaussian Process Regression (GPR) is proposed. This model was more accurate in detecting the SOH using just 10 seconds of charge voltage data, compared to other references that use approximately 6000 seconds of data. Using the Oxford Battery Dataset, we show that FNN excels in early-cycle estimations, while GPR performs better over full cycles. After detecting and excluding poorly performing cells, the combined model achieves superior accuracy, highlighting its potential for second-life battery applications and cell balancing strategies
Approximate Adsorption Performance Indicator in Evaluating Sustainable Bamboo-Derived Adsorbents for Biogas Upgrading
No full textInternational audiencePurifying biogas by removing contaminants and carbon dioxide (CO2) to produce biomethane enhances its energy content, making it suitable as fuel and for injection into natural gas grids. Bamboo-derived adsorbents Bamboo-500 (pyrolyzed at 500 °C), Bamboo-700 (pyrolyzed at 700 °C), and Bamboo-A-900 (activated with CO2 at 900 °C) were synthesized and characterized to evaluate their performance for CO2 and CH4 adsorption. Increasing pyrolysis temperature from 500 °C to 700 °C and further CO2 activation at 900 °C enhanced adsorption capacities of CO2 and CH4 due to improved surface area and micropore structure. In this study, the novel Approximate Adsorption Performance Indicator (AAPI) approach is introduced, offering an efficient method for evaluating adsorbent performance, particularly in biogas upgrading. AAPI results suggest Bamboo-500 is suitable for biogas upgrading at very low pressures (<0.12 MPa) with low regeneration energy and acceptable CO2 capacity (1.9 ± 0.2 mol kg−1). However, Bamboo-A-900 excelled at medium and high pressures by its highest CO2 adsorption capacity (8.0 ± 0.3 mol kg−1) promoted by the high surface area (1220 m2g−1) and calcium oxide presence. Finally, Bamboo-A-900 shows promise for enhancing CO2 adsorption and biogas upgrading. Bamboo-derived adsorbents offer a sustainable solution for biogas upgrading, supporting Sustainable Development Goals by promoting clean energy transitions
Vanadium and Iron substituted polyoxotungstate iodonium and tetrabutylammonium salts for visible light Free Radical Polymerization
No full textInternational audienceA series of diphenyliodonium and tetrabutylammonium salts of vanadium (+V) and iron (+III) mono and disubstituted polyoxotungstates was designed and tested as visible light photoinitiators for the free radical polymerization of acrylates or the cationic polymerization of epoxides. Interestingly, these polyoxotungstates could act as efficient photosensitizers for Type I or Type II photoinitiators (TPO-L, ITX), enabling to get excellent monomer conversions upon excitation at 405 nm
Distance-based distributed nonlinear MPC for local leader-follower formation tracking
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Impact of Disorder, Porosity, and Surface Chemistry of Salt Templated Carbons on Capacitance
No full textInternational audienceThe necessity of tailoring the structure/texture of carbons to improve the performance of aqueous-based electrical double-layer capacitors (EDLCs) is emphasized. A green soft-salt templating approach allowed the preparation of a series of porous carbons for this target. The EDLCs operating in 1M Li 2 SO 4 demonstrated a maximum capacitance of 244 F g -1 at 1.6 V (CsCl/KCl-T), long-term cycle life (288 h for LiCl/KCl-T), and a specific energy exceeding 10 Wh kg -1 . The physicochemical properties of carbons have been correlated with capacitance, retention, and stability. The investigation by Raman spectroscopy revealed that carbons with the increased disorder, thus, higher I D /I G ratio, are in accord with enhanced capacitance. Active surface area (ASA) values, related to carbon defects, perfectly supported the Raman findings. Surface functionality, i.e., the phenol/ether and carboxyl groups are found to affect capacitance. The carbons showed a predominance of micropores, with a specific surface area (SSA) ranging from 2640 to 1453 m 2 g -1 . In sum, I D /I G , SSA, ASA, and volume of micropores are in linear proportion with capacitance at various regimes. However, the most ordered and less porous materials provided better lifespan performance. Therefore, a good compromise is required to satisfy both high capacitance and the long cycle life of EDLCs