Ecole Nationale de l'Aviation Civile
Toutes les publications de l'ENAC en direct.
All ENAC publications.
We propose the concept of “transface” that defines interaction as a traversal for both surface-bound and surface-free interfaces. The transface concept considers an “inter-face” not as an object but as a relation, a medium, that defines interaction. A transface has five dimensions: alterity (1) because, as a medium, the transface establishes a relation with something other than itself, and the operations (2) it enables. Being a relation, a transface is perceived only by these three effects: as a traversable (3) with flows (4) that traverse it, providing a traversal experience (5). We present an exploration of the transface concept with concrete examples from the...
We propose the concept of “transface” that defines interaction as a traversal for both surface-bound and surface-free interfaces. The transface concept considers an “inter-face” not as an object but as a relation, a medium, that defines interaction. A transface has five dimensions: alterity (1) because, as a medium, the transface establishes a relation with something other than itself, and the operations (2) it enables. Being a relation, a transface is perceived only by these three effects: as a traversable (3) with flows (4) that traverse it, providing a traversal experience (5). We present an exploration of the transface concept with concrete examples from the...
La régression statistique appliquée à des données appartenant à des espaces non euclidiens suscite un grand intérêt depuis de nombreuses années. La structure géométrique particulière de ces espaces implique l'adaptation des outils statistiques habituels. L'approche géométrique permet de prendre en compte de façon intrinsèque, c'est à dire indépendamment de tout choix de coordonnées ou d'immersion, les caractéristiques des données en évitant les distorsions induites par des représentations extrinsèques. Les applications en sont multiples : traitement du signal, détection radar, imagerie médicale, météorologie, trajectographie, vision par ordinateur par exemple. Dans ce...
We study Innovative Air Mobility (IAM) as a dedicated hub feeder and dispersal service for Bologna Guglielmo Marconi Airport (BLQ), addressing short-range airport-to-airport connectivity where scheduled fixed-wing services are inefficient and surface access is time-consuming. Demand is generated directly from BLQ's flight timetable via a staggered rolling-window model: arriving passengers become IAM-eligible after a 20-minute buffer (a baseline 70% "staying" share is considered and distributed across nearby airports using a gravity model), while feeder demand for departures is timestamped backward by IAM travel time plus a 2-hour pre-flight buffer. We build an IAM-only...
Next-generation liquid rocket engines are being designed to recover launcher boosters. Achieving this capability requires deep throttling. Low-throttle operation can bring chamber pressures below the critical pressures of the propellants, entering subcritical regimes. Engine behavior under subcritical conditions remains poorly understood: the coexistence of liquid and vapor phases can alter injection, vaporization, and combustion delays, potentially affecting overall flame dynamics and thermoacoustic stability. The current paper represents the first attempt at studying the flame dynamics of thermoacoustically stable and unstable liquid rocket engines at both supercritical...
Ce document de prospective, finalisé fin 2025, propose un état des lieux de la recherche en France en Recherche Opérationnelle et Décision (ROD), les tendances observées et de grands enjeux. Il considère les évolutions des outils et techniques au sein de la ROD, puis son positionnement dans l'informatique et son environnement technique, puis plus largement dans le système socio-technique et environnemental dans lequel elle s'inscrit. Ce document s'adresse d'abord aux chercheuses et aux chercheurs de la communauté ROD (dont les jeunes chercheurs et les entreprises) afin de lister les grands enjeux qui nous rassemblent, des verrous scientifiques communs et/ou des enjeux...
<div><p>Some of the challenges faced by emerging LEO-PNT systems are the increase of the received signal dynamics due to the LEO satellite orbits, as well as the degradation of the received signal carrier phase stability. This is caused in part due to the lower quality of the satellite clocks, and due to the potential increase of the signals carrier frequency. First, this paper tackles the challenge of observing higher signal dynamics by analyzing the necessity to update the model of the Numerically Controlled Oscillator. Indeed, the received signal dynamics may evolve too fast to be approximated as a linear model inside a Delay Locked Loop or Phase Locked Loop update...
Abstract In turbomachinery axial compressor development, detailed multi-stage 3D blade optimizations enable better designs than their common single-stage counterparts. However, this design problem entails a prohibitive computational effort for industrial application. It is very high-dimensional and highly constrained and involves expensive aerodynamic and structural design evaluations. Bayesian optimization (BO) is well suited for the two latter characteristics but suffers from the curse of dimensionality. In contrast to previous approaches, we exploit the problem’s multi-component structure to overcome this challenge. We propose to decompose the overall optimization task...
