HAL-Université de Bretagne Occidentale
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L'incarcération d'un agent public ne suffit pas en elle-même pour faire échec à sa radiation pour abandon de poste
No full textInternational audienceNote sous CAA Nantes, 24 juin 2025, no 24NT0181
BERT-Inspired HT Localization on FPGA AI Accelerators
No full textInternational audienceOutsourcing accelerates AI hardware development but exposes designs to hardware Trojan (HT) risks. The stealthy nature of HTs and increasing complexity of CNN accelerators limit the effectiveness of traditional detection and localization techniques. This paper presents a segmentation-driven power side-channel framework combined with a customized BERT-inspired model to localize HT-affected regions relative to a trusted baseline. By dividing traces into segments and analyzing them with transformer attention, the method enables targeted auditing and reduces manual inspection. Experiments on real power measurements with physical HTs achieve 92.1% localization accuracy on known HTs and 75.2% on unseen HTs. Contributions include a pre-processing pipeline for segmented trace analysis, a BERT-style architecture optimized for HT localization, and demonstrated generalization across multiple HT instances. The approach supports efficient, focused security audits in outsourced fabrication workflows.</div
Les écrits viatiques de Rose de Freycinet : regard d'une voyageuse hors norme sur son tour du monde à bord de L'Uranie (1817-1820)
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Perspectivas contemporaneas de la Antropologia de Konrad Th. Preuss en Colombia : arqueología agustiniana, etnografía Kágaba de la Sierra Nevada y Murui del Amazonas
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Représentations des handicaps dans la littérature jeunesse francophone : revue de la littérature scientifique
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Les sciences de l’éducation au prisme des acteurs
No full textInternational audienceCe chapitre entend dresser un état des lieux de la discipline au prisme de trois institutions : le CNU, l’association des chercheurs en sciences de l’éducation et l’association transdisciplinaire en histoire de l’éducation. Il nous est apparu, en effet, que prendre le point de vue des acteurs était indispensable. Il faut préciser, à propos du CNU et pour lever toute ambiguïté ou tout reproche que l’on pourrait nous adresser, que nous avions demandé la même analyse aux représentants des trois autres listes syndicales présentes en section 70. Une seule liste a bien voulu répondre par le biais de son représentant : nous le remercions et regrettons que les autres n’aient pas trouvé le temps nécessaire. Le chapitre est organisé ainsi en trois moments : le CNU, l’AECSE et l’ATHRE. Chacun de ces acteurs avait carte blanche et nous les en remercions de nous avoir fait confiance et d’aider ainsi à mieux comprendre le paysage actuel des sciences de l’éducation en France. [...]Le Conseil national des universités (CNU) : principales évolutions de 1993 à 2020 -- Évolution de la structure démographique des enseignants-chercheurs en sciences de l’éducation en France (1993-2020) -- Typologie des enseignants-chercheurs en sciences de l’éducation en France (2020)L’AECSE : de quelques déterminants et caractéristiques des sciences de l’éducation (et de la formation) en France -- Le poids des conditions locales sur la structuration de la discipline -- Une croissance importante des effectifs d’enseignants-chercheurs et leur dissémination -- Une transformation du public des sciences de l’éducation -- Diversité des contenus d’offre de formation en licence -- Le changement de nom de la discipline : révélateur d’enjeux identitaires et professionnels -- Sciences de l’éducation et formation des enseignantsL’Association transdisciplinaire pour les recherches historiques sur l’éducation et les sciences de l’éducation (L’ATHRE)</b
Lectures alternatives de La Queste del saint Graal : version ordinaire et interpolations novatrices dans quelques manuscrits
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Heat-stressed corals and the important role of picoplankton-derived nitrogen
No full textInternational audienceCarbon (C) and nitrogen (N) are essential nutrients for coral–Symbiodiniaceae associations, yet global change can disrupt C and N acquisition by corals, affecting their resilience under stress. We investigated how two octocorals (Sarcophyton glaucum, Lobophytum sp.) and two hexacorals (Stylophora pistillata, Turbinaria reniformis) assimilate nitrogen from three 15N-labelled sources—dissolved free amino acids (DFAAs), Synechococcus (picoplankton), and Artemia salina nauplii (microplankton)—supplied at 1 µM N, under control (26 °C) and heat stress (30 °C) conditions. Corals were also incubated with natural pico-nanoplankton assemblages, with concentrations measured via flow cytometry. In addition, we measured the rates of photosynthesis and respiration, to estimate the relative contribution of autotrophy to the corals’ respiratory needs. Across all species, Synechococcus was the most efficiently assimilated N source, with uptake increasing under heat stress. Estimates of heterotrophic carbon assimilation (using C:N ratio) coupled with respiratory measurements showed that Synechococcus can provide 30–70% of the corals’ daily respiratory carbon demand, especially in the most heterotrophic species. Octocorals exhibited lower C and N assimilation rates than hexacorals, likely due to lower N needs and consistent with their overall lower metabolic requirements. Notably, S. glaucum displayed great flexibility in compensating reduced autotrophy through heterotrophy under heat stress. Incubations with natural plankton assemblages revealed increases in pico-nanoplankton concentrations in the presence of corals, likely stimulated by coral mucus release. These results demonstrate that picoplankton contributes significantly to both carbon and nitrogen budgets during heat stress and highlight species-specific nutritional strategies that may shape coral resilience under future climate conditions
Physical Processes Driving Carbon Subduction in the Southern Ocean in an Eddy‐Permitting Model
No full textInternational audienceThe Southern Ocean south of 35°S represents a small source of natural inorganic carbon for the atmosphere but a major sink of anthropogenic carbon. The magnitude of the inorganic carbon sink, and the sequestration of inorganic and organic carbon strongly depend on the rate at which they are subducted below the mixed layer. We use a global ocean model at 0.25°resolution to quantify the drivers of the pathways of total and anthropogenic dissolved inorganic carbon (DIC) and organic carbon (OC) across and within the time-varying mixed layer of five physically consistent regions of the Southern Ocean over the period 1995-2014. Total DIC is brought into the mixed layer through obduction south of the Antarctic Circumpolar Current (ACC) and subducted north of the ACC, resulting in a net obduction of 11.2 PgC/year, with advective processes being responsible for about two-thirds of the total transfer. Anthropogenic carbon is brought to the mixed layer through the ocean surface in all regions but mainly subducted north of the ACC, with the subduction (1.05 PgC/ year) being achieved through both advection and diffusion, each dominating respectively north and south of the Subantarctic Front. Two thirds of the organic carbon are subducted through the gravitational pump (1.9 PgC/ year) and one-third through physical transfer (0.9 PgC/year), with an equivalent contribution from advection and diffusion. At the local scale, advective fluxes largely dominate other physical processes in transferring carbon across the base of the mixed layer, and are found to be increased near topographic features and boundary currents
High-resolution evolution of sediment yields in the Valencia and Menorca basins during the Neogene: Relation with climate, tectonics and Ebro Basin opening
No full textInternational audienceBasin-wide stratigraphic correlation along the Valencia and Menorca basins enabled to provide a high-resolution quantitative sedimentary history for the last 23 Ma. The identified seismic markers were dated, thanks to well calibration, thickness maps of successive units were built, and associated sediment fluxes were calculated. This allowed to highlight the evolution of sediment routing through space and time over the Neogene and to discuss the local vs global triggers impacting this sediment yield, such as tectonics and climate, in particular in relation with the Ebro Basin opening to the Mediterranean Sea. Results of this study point to the successive trends: (i) a three-fold increase in sedimentary yields at the Burdigalian-Langhian transition in the Valencia Basin; (ii) an almost steady state during the Serravallian-Tortonian intervals; (iii) a nine-fold increase in sediment -flux during the Messinian Crisis, especially after the main intra-Messinian sea-level fall; (iv) a 2.5-fold sediment flux increase between the Miocene and the Pliocene and, finally, (v) a sedimentary flux increase by 1.5 at 0.45 Ma. The Mid-Miocene trend is likely linked to enhanced erosional processes during the ultimate phase of the Balearic orogeny and initiation of the subsidence in the adjacent area. The Climatic optimum at that time led also to the development of in-situ carbonate systems along the Ebro platform. The nine-fold increase in sediment flux during the Messinian Salinity Crisis reflect the huge erosional processes and sediment transfer from upstream into the basins; the fact that no increase is observed before the Late Messinian favours the hypothesis that the Ebro basin remains as an endorheic system until its catastrophic breaching that seems to occur during the crisis (with the uncertainty about the delay of the answer within the system). The 2.5-fold sediment increase between the Miocene and the Pliocene is in accordance with the observed increase on the Gulf of Lion margin, and on a worldwide scale. This increase is likely linked to the intense erosion of the Ebro Basin after the complete establishment of the modern Ebro River at the end of the Messinian Salinity Crisis and/or to the establishment of a more humid climate. The final increase, associated with an increase in sedimentary transfers from the Valencia Basin to the Menorca Basin through the Valencia channel system, mainly reflects the effects of the longer and larger eustatic cycles over the last 500 ka. These findings demonstrate that sediment yields are exceptional recorders of multi-timescale geomorphologic processes, even if they cannot always serve as precise chronometer. They also support a three-phases interpretation for the Ebro system: (1) a Mid-Miocene interval characterized by enhanced erosion in the Balearic orogen and subsidence initiation in the adjacent basins, without evidence of connection between the Ebro basin and the Mediterranean (even if Ebro tributaries are testified); (2) a catastrophic breaching during the Messinian Salinity Crisis, and (3) Pliocene and Quaternary intervals testifying of a fully Ebro River system connected to the Mediterranean