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Animations sur Drone pour la Lutte Contre les Incendies
No full textInternational audienceDrones provide valuable support in firefighting missions by offering a novel aerial perspective, enabling mission commanders to make more informed decisions. However, their potential to directly deliver information to firefighters on the ground remains underutilized. We present a prototype drone capable of transmitting real-time information to firefighters via a low-resolution display. Using an iterative design process (N=11+7), we created a set of animations aimed at conveying critical information, based on firefighting tasks identified in the literature. These animations were evaluated in a user study conducted with the drone (N=12).Results show that the animations are readable and recognizable, even when the drone is not directly facing participants, with higher recognition rates than scrolling text or single-character displays. This work contributes a set of low-resolution animations evaluated for field communication and opens new possibilities for using low-resolution visual feedback in extreme environments.Les drones offrent un soutien précieux lors des missions de lutte contre les incendies en fournissant un point de vue inédit, permettant aux chefs de mission de prendre des décisions avec une plus grande connaissance de la situation. Cependant, leur potentiel pour fournir directement des informations aux pompiers sur le terrain reste sous-exploité. Nous proposons un prototype de drone capable de transmettre des informations en temps réel aux pompiers via un écran à basse résolution sur le drone. Nous avons conçu des animations en utilisant un processus itératif (N=11+7) pour communiquer des informations cruciales aux pompiers, basées sur des tâches identifiées dans la littérature. Les animations ont été évaluées sur le drone lors d'une étude utilisateur (N=12).Les résultats montrent que ces animations sont lisibles et reconnaissables, même lorsque le drone n'est pas directement orienté vers les participants, avec un taux de reconnaissance plus élevé que celui des textes défilants ou des lettres simples. Ce travail contribue à la création d’un ensemble d’animations basse résolution, évaluées pour leur capacité à transmettre des informations sur le terrain. Il ouvre le chemin à l'utilisation d'informations basse résolution dans des environnements extrêmes
Proposition for the EUSIPCO 2025 Phased Array Signal Processing Student Challenge
No full textInternational audienceGlobal Navigation Satellite Systems rely on estimating the signal propagation delay and Doppler shift to a set of visible satellites, which in turn allows to determine the receiver position, velocity and timing. However, the presence of interfering signals degrades the estimation of such synchronization parameters, reason why robust solutions must be accounted for. One specific kind of interference are jamming, where a powerful signal is emitted in the same bandwidth as the signal of interest. One possible way to mitigate jamming is to resort to an antenna array. Doing so, spatial diversity can help to estimate the most powerful signal, allegedly the interference, and perform detection, localization and mitigation. In our solution, we propose two methods: the first one is an offline one, which uses snapshots where the interference is the most powerful to allow for precise detection and localization of the interferer. The other one is an online one, allowing to perform detection, localization and mitigation in real time of the interfering signal
Adaptive Gaussian process-based strategies for solving the NASA-DNV UQ challenge 2025
No full textInternational audienceThis paper describes a dedicated approach to solve the 2025 NASA-DNV UQ challenge problem using adaptive Gaussian process strategies. The uncertainty model is determined through a calibration problem using an optimization approach to identify the aleatory variable joint distribution and the epistemic variable uncertainties. The estimation of the prediction interval for the model output components consists of a quantile estimation problem based on an adaptive Gaussian process strategy. Eventually, the design optimization problems are solved using Bayesian optimization controlling the noise level involved in the estimation of the objective and constraint functions
Passivity-Enforcing Multipole-Based Approach for Time-Domain Wave Propagation in Single and Double Porosity Media
No full textThis work investigates the time-domain propagation of waves in rigid frame porous media, which can be modelled as an equivalent fluid. Using a multipole approximation, frequency-domain representations of single and double porosity media are translated into the time domain while ensuring system passivity through a constrained nonlinear least squares approach. The proposed method is validated with time domain simulations using an example of double porosity media in an impedance tube
Key Recovery from Side-Channel Power Analysis Attacks on Non-SIMD HQC Decryption
No full textInternational audienceHQC is a code-based cryptosystem that has recently been announced for standardization after the fourth round of the NIST post-quantum cryptography standardization process. During this process, the NIST specifically required submitters to provide two kinds of implementation: a reference one, meant to serve lisibility and compliance with the specifications; and an optimized one, aimed at showing the performance of the scheme alongside other desirable properties such as resilience against implementation misuse or side-channel analysis. While most side-channel attacks regarding PQC candidates running in this process were mounted over reference implementations, very few consider the optimized, allegedly side-channel resistant (at least, constant-time), implementations. Unfortunately, HQC optimized version only targets x86-64 with Single Instruction Multiple Data (SIMD) support, which reduces the code portability, especially for non-generalist computers. In this work, we present two power side-channel attacks on the optimized HQC implementation with just the SIMD support deactivated. We show that the power leaks enough information to recover the private key, assuming the adversary can ask the target to replay a legitimate decryption with the same inputs. Under this assumption, we first present a key-recovery attack targeting standard Instruction Set Architectures (ARM T32, RISC-V, x86-64) and compiler optimization levels. It is based on the well known Hamming Distance model of power consumption leakage, and exposes the key from a single oracle call. During execution on a real target, we show that a different leakage, stemming from to the micro-architecture, simplifies the recovery of the private key. This more direct second attack, succeeds with a 99% chance from 83 executions of the same legitimate decryption. While the weakness leveraged in this work seems quite devastating, we discuss simple yet effective and efficient countermeasures to prevent such a key-recovery
Auditory–tactile presentation accelerates target detection in a multitasking situation
No full textInternational audienceAbstract There is ample evidence from cognitive sciences and neurosciences studies that multisensory stimuli are detected better and faster than their unisensory counterparts. Yet, most of this work has been conducted in settings and with protocols within which participants had the sole detection task to perform. In realistic and complex environments, such as military ones, detection of critical information has to be performed while the operator is concurrently managing several others tasks and processing a vast amount of sensory inputs. To date, it remains to determine whether multisensory benefits for detection hold true in complex multitasking situations. In the present study, we compared the detection performance of healthy participants when the target was only auditory, only tactile, or both auditory and tactile. Detection performance was measured in a simple detection task condition and in a multitasking condition. In the latter, participants had to detect the targets while concurrently performing the subtasks of the MATB-II environment, designed in the 90s by NASA to simulate piloting tasks. Multisensory acceleration of reaction times was larger during multitasking compared to single-task conditions. Crucially, participants detected auditory–tactile targets faster than their unisensory counterparts. While previous studies have reported such facilitation effects in single-task contexts, our results show that multisensory facilitation of detection speed does occur in a realistic multitasking environment and is larger than in simple task conditions. Auditory-tactile displays seem to have the potential to enhance information presentation and could be used in applied settings like military aviation
Le compagnonnage dans un écosystème pédagogique inter-universitaire : une opportunité de formation des acteurs ?
No full textInternational audienceLes accompagnateurs pédagogiques ont un rôle crucial dans les écosystèmes de formation et en particulier dans les établissements d’enseignement supérieur, sujets à de nombreuses réformes et évolutions. Le développement professionnel de ces acteurs est donc un sujet majeur qui passe beaucoup par les interactions, souvent informelles, entre pairs via les réseaux organisés localement ou nationalement et les associations internationales. Dans la région Occitanie, une expérimentation de formation pour des ingénieurs et conseillers pédagogiques de plusieurs établissements a été mise en place en intégrant la modalité du compagnonnage. Après 2 ans de fonctionnement du dispositif, tant les formés que les formateurs font état d’une expérience enrichissante et effective, tenant compte des réalités et des contraintes institutionnelles de chacun. La méthodologie de compagnonnage libre proposée pourrait être revue afin d’intégrer des entretiens réflexifs dans le cadre d’un modèle plus structuré comme celui de Clutterbuck
Pourquoi Les Images Seulement ? Exploration de Recherche de Contenu Audio-visuelle dans Les Vidéos Égocentriques
No full textInternational audienceSound modality carries information that image does not. In order to exploit this information in the best way when navigating egocentric videos, this work explores how users query and interact with sound-based content in egocentric videos. We propose a zero-shot audiovisual retrieval method. Then, we design two user studies, (1) we ask users how they query sound in a mass web-based questionnaire and (2) we compare vision-only retrieval with audio-visual retrieval in egocentric, or first person, videos.Le son contient des informations que l'image ne contient pas. Afin d'exploiter au mieux ces informations lors de la navigation dans des vidéos égocentriques, ce travail explore la manière dont les utilisateurs interrogent et interagissent avec le contenu sonore de ces vidéos. Nous proposons une méthode de récupération de contenu audiovisuelle sans entrainement. Ensuite, nous concevons deux études utilisateurs : (1) nous interrogeons les utilisateurs sur leur façon d'interroger le son dans un questionnaire en ligne de masse et (2) nous comparons la récupération visuelle seule à la récupération audiovisuelle dans les vidéos égocentriques
Optimizing multimodal alarms to mitigate inattentional blindness in air traffic control
No full textInternational audienceThis study evaluates the effectiveness of multimodal alarms in reducing inattentional blindness (i.e., the inability to detect unexpected visual stimuli), a critical safety concern in air traffic control (ATC). Two experiments were conducted: the first assessed the attention-capturing ability of multimodal alarms with visual, vibrotactile, and auditory alerting components in a simulated ATC task with 29 student controllers, using electroencephalography (EEG), questionnaires, and performance metrics. The second assessed the effectiveness of visual ambient alarms with reduced opacity and duration with 28 students. Results indicated that multimodal alarms significantly reduced missed alarms compared to the standard ATC alarm, but were perceived as more urgent and annoying. Notably, even low-opacity (5%) and brief (17 ms) visual ambient alarms were effective. These findings provide insights for optimizing alarm designs in safety-critical environments such as aviation, healthcare, and nuclear power.</div