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Reconstruction dentaire 3D haute fidélité par fusion de scans intra-oraux et de données CBCT via des représentations implicites profondes
No full textInternational audienceHigh-fidelity 3D tooth models are essential for digital dentistry, but must capture both the detailed crown and the complete root. Clinical imaging modalities are limited: Cone-Beam Computed Tomography (CBCT) captures the root but has a noisy, low-resolution crown, while Intraoral Scanners (IOS) provide a high-fidelity crown but no root information. A naive fusion of these sources results in unnatural seams and artifacts. We propose a novel, fully-automated pipeline that fuses CBCT and IOS data using a deep implicit representation. Our method first segments and robustly registers the tooth instances, then creates a hybrid proxy mesh combining the IOS crown and the CBCT root. The core of our approach is to use this noisy proxy to guide a class-specific DeepSDF network. This optimization process projects the input onto a learned manifold of ideal tooth shapes, generating a seamless, watertight, and anatomically coherent model. Qualitative and quantitative evaluations show our method uniquely preserves both the high-fidelity crown from IOS and the patient-specific root morphology from CBCT, overcoming the limitations of each modality and naive stitching
Chinese Grafts in urban production: Perspectives from Cambodia and Thailand
No full textInternational audienceAgainst dominant arguments about a distinctive Chinese urbanism taking shape along the corridors of the Belt and Road Initiative, we argue that Chinese transfers in urban production of Southeast Asia depend on the national and local temporalities of urban and infrastructure development and relate to infrastructure-driven strategies for regional integration. Drawing on a comparison between case studies located in Cambodia and Thailand, we show how Chinese actors are not in a position of control over urbanization processes. Rather, ad hoc arrangements are produced that allow for Chinese transfers to be grafted: into the transitioning urban fabric, onto consortia of actors, development strategies, and programs. The metaphor of the graft helps us analyse how a diversity of Chinese transfers are situated and intertwined along a spectrum that goes from the shiny, flagship projects of the BRI to the shadowy, informal and even illegal, investments in the industrial and construction sectors
Problème riche de transport à la demande de personnes à mobilité réduite
No full textInternational audienceProblème riche de transport à la demande de personnes à mobilité réduit
Interplay between cholesterol, Bis(monoacylglycerol)phosphate, and parasitophorous vacuole dynamics in Leishmania infantum infection of macrophages
No full textInternational audienceLeishmania spp., the causative agents of leishmaniasis, are protozoan parasites displaying two life stages: promastigote in the insect vector and amastigote in host macrophages. After inoculation, the promastigote differentiates into the amastigote which multiplies within a parasitophorous vacuole formed by the fusion of the phagosome with the macrophage endolysosome. This compartment is characterized by a specific enrichment in bis(monoacylglycerol)phosphate (BMP), an atypical phospholipid that regulates endosomal dynamics and cholesterol trafficking. Host cell cholesterol is essential for parasite intracellular development. In this study, we examined the relationships between cholesterol, BMP, and the parasitophorous vacuole during the infection of J774 murine macrophages with L. infantum. Our results showed that cholesterol is redistributed in the vicinity of the parasite within infected cells. BMP is redistributed along with the same pattern and colocalizes with markers of the parasitophorous vacuole. Transcriptomic analyses revealed an upregulation of key genes governing cholesterol uptake and synthesis (HMGCR, SREBP2, LDLR) during infection and conversely a downregulation of ABCA1 involved in cholesterol efflux. Noteworthy, the overexpressions of HMGCR, SREBP2, LDLR were significantly attenuated by macrophage BMP enrichment. As for functional impact, BMP enrichment was associated with a significant increase of the parasite infectivity toward macrophages, assessed by infection rate and parasite load. Together, our results confirm the essentiality of macrophage cholesterol and demonstrate the involvement of BMP during Leishmania infection likely by facilitating parasitophorous vacuole remodeling and cholesterol trafficking
Decision-Making Approaches for Deconstruction Operations Optimization: A Literature Review
No full textInternational audienceThe construction industry needs to rethink its current waste management practices. One solution path is applying circular economy (CE) principles to building demolition such as deconstruction practice. Considered as a more-resource-friendly alternative compared to standard demolition, deconstruction involves dismantling a building with the aim of maintaining the highest possible value for its materials and maximizes their recovery potential. This chapter reviews the literature to identify and analyze recent research studies reporting on decision-making approaches developed for deconstruction operations planning (e.g., project scheduling, material transportation planning, and logistics network design). Specifically, the decision-making approaches are presented through the description of the supply chain operations, the planning level, the decisions to be made, as well as the objectives considered in the optimization models proposed. The application of some of these approaches on case studies is also discussed. Finally, this chapter identifies the limitations of current research in the field and suggests future research perspectives
A complete answer to the strong density problem in Sobolev spaces with values into compact manifolds
No full textLe développement des réseaux de chauffage urbains et la valorisation de chaleur fatale en France
No full textInternational audienc
Analysis of Corona and Surface Discharge Signals from Different Non-Intrusive Sensors under HVDC
No full textInternational audienceThe use of high voltage direct current (HVDC) transmission technology has increased significantly in recent years due to its numerous advantages over traditional alternating current (AC) transmission. The aim of the present work is to investigate the efficiency of different non-intrusive sensors for partial discharge measurement in medium or high voltage direct current equipment such as air or gas insulated switchgear. In HVAC systems, partial discharge detection and quantification are well understood. However, under HVDC, it is a necessary to evaluate the efficiency of classic techniques and commercial non-intrusive sensors. This work presents a study of three different sensors for partial discharge measurement under HVDC: high frequency current transformer (HFCT), ultra-high frequency antenna (UHF), and transient earth voltage (TEV). The signals of the different sensors for corona and surface discharge detection are presented and compared in both temporal and frequency domains. The Pulse Sequence Analysis (PSA) technique is used for apparent charge and repetition rate study and the effect of the discharge type on the PSA patterns is investigated. The results show that the PSA patterns are sensitive to the discharge type and conditions. The increase of the applied voltage of corona leads to the increase of the apparent charge differences and the time duration between successive pulses. The spectrums of the discharge pulses of the three sensors are different and the maxima of the TEV and UHF PD signals are dependent on the apparent charge
: Déchets, énergie, CO2 : enquête sur le bouclage des flux résiduels
No full textInternational audienceLes systèmes urbains contemporains génèrent de manière excessive différentes formes de résidus que l’on cherche à valoriser dans une perspective d’économie circulaire. L’enquête porte sur trois « flux résiduels » – les déchets, l’énergie fatale et le CO2 – en s’attachant à comprendre les multiples niveaux de gouvernance et de cadrage dont ils relèvent et les interdépendances qui les lient. A l’examen des normes, instruments et politiques qui gouvernent ces flux en Europe et en France s’ajoute une analyse territoriale dans quatre métropoles où sont menés des projets et des politiques qui tendent à leur bouclage. Tout en apportant un éclairage sur les évolutions et contradictions de l’action publique environnementale contemporaine, l’ouvrage souligne les limites d’une économie circulaire porteuse de promesses mais aussi de profonds dilemmes
Habiter Babel: Un manifeste pour une Ingénierie du Sens responsable
No full textInternational audienceThis book deconstructs the illusions of semantic automation, AI "understanding," and universal ontologies. Core thesis: meaning is neither computable, nor storable, nor transferable.For data architects, AI practitioners, enterprise architects, and systems engineers confronting the failure of "well-designed" solutions.Topics: Semantic interoperability, knowledge graphs, ontology engineering, AI language models, meaning governance, federated systems, enterprise architecture, complex systems.Format: PDF ebook, 65 pages, EnglishAuthor: Dr. Nicolas Figay - Expert in interoperability and enterprise architectures (Airbus Defence and Space) - LIRIS UMR 5205 CNRS / INSA Lyon / Université Claude Bernard Lyon 1Not a manual. A manifesto. No turnkey solutions—only conceptual lucidity for those who refuse to let technology decide meaning in their place.Ce livre n’est ni un guide pratique, ni un manuel sur l’IA, les ontologies ou les knowledge graphs.Habiter Babel est un essai-manifeste sur les confusions conceptuelles qui traversent aujourd’hui les discours sur :la sémantique,l’interopérabilité,l’intelligence artificielle,et les systèmes dits « intelligents ».La thèse est simple, mais exigeante :Le sens n’est ni calculable, ni stockable, ni transférable.À partir de cette affirmation, le livre déconstruit :les promesses d’unification sémantique,les fantasmes d’automatisation du sens,la naturalisation abusive des modèles et des ontologies.Il propose une autre posture :non pas résoudre Babel, mais l’habiter —en assumant la pluralité des mondes, la nécessité de la traduction, et la responsabilité humaine dans les systèmes socio-techniques.À qui s’adresse ce livreCe texte s’adresse à des lecteurs déjà confrontés à la complexité :architectes data / SI,responsables IA,chercheurs,décideurs techniques,ingénieurs confrontés à l’échec de solutions pourtant « bien conçues ».Il n’est pas destiné :aux débutants,aux amateurs de recettes,ni aux discours de solutionnisme technologique.FormatPDF – lecture individuelleAucune promesse d’outillage ou de méthode clé en main.AuteurDr Nicolas FigayArchitecte du sens et médiateur conceptuel des systèmes complexes