HAL Portal UPHF (Université Polytechnique Hauts-de-France)
Not a member yet
28473 research outputs found
Sort by
Bridging Surface Science and van der Waals Engineering: Growth Mechanisms and Assembly of Functional Nanostructures
No full textProf. LOPPACHER Christian, IM2NP - Université Aix-Marseille (rapporteur) Prof. RICHTER Christine, DICO - CY Cergy Paris Université (rapportrice) DR CNRS BORISSOV Andrey, ISMO - Université Paris Saclay (rapporteur) Prof. MASSON Laurence, CINAM - Université Aix-Marseille (examinatrice) DR CEA FIORINI Céline , SPEC – IRAMIS - CEA Saclay (examinatrice) DR CNRS CLAIR Sylvain, IM2NP - Université Aix-Marseille (examinateur) DR CNR DELERUE Christophe, IEMN - Université de Lille (garant)This HDR memoir presents a concise overview of my research activity, from postgraduate studies to my current academic position, with a focus on nanoscience, surface science, and materials science. It begins with the scientific motivations behind the choice of these fields, followed by a summary of the work carried out during successive postdoctoral appointments. These studies primarily address the controlled growth of two-dimensional (2D) organic and inorganic films, as well as one-dimensional (1D) and zero-dimensional (0D) nanostructures, investigated using a broad range of advanced surface-sensitive techniques.These projects laid the conceptual and methodological foundation for my current research and directly inspired its development. My ongoing work builds on the expertise acquired and aims to address long-term goals in the design of adaptive polymers and nanostructured graphenes as versatile platforms for engineering robust 2D layers with tunable, integrated functionalities. The approach involves designing specific functional units at the molecular level and scaling them up through integration into extended 1D and 2D polymeric or graphenic architectures. A central aim of my current projects is to establish precise control over the shape, dimensionality, chirality, and functionality of the resulting nanostructures, and to enable their effective transfer onto targeted substrates for further integration into van der Waals heterostructures and prototypal devices. With this objective, four main research directions have been initiated and are currently in progress: (i) investigating the role of triphenylamine functionalization on the formation of surface-confined organic frameworks (SCOFs); (ii) engineering and probing the physical properties of novel nanoporous graphene structures; (iii) fabricating and studying nanostructured carbon nitrides; and (iv) examining the influence of substrate type on the growth of molecular switch films, with the goal of achieving controllable tuning of properties in the resulting 2D materials.This HDR memoir presents a concise overview of my research activity, from postgraduate studies to my current academic position, with a focus on nanoscience, surface science, and materials science. It begins with the scientific motivations behind the choice of these fields, followed by a summary of the work carried out during successive postdoctoral appointments. These studies primarily address the controlled growth of two-dimensional (2D) organic and inorganic films, as well as one-dimensional (1D) and zero-dimensional (0D) nanostructures, investigated using a broad range of advanced surface-sensitive techniques.These projects laid the conceptual and methodological foundation for my current research and directly inspired its development. My ongoing work builds on the expertise acquired and aims to address long-term goals in the design of adaptive polymers and nanostructured graphenes as versatile platforms for engineering robust 2D layers with tunable, integrated functionalities. The approach involves designing specific functional units at the molecular level and scaling them up through integration into extended 1D and 2D polymeric or graphenic architectures. A central aim of my current projects is to establish precise control over the shape, dimensionality, chirality, and functionality of the resulting nanostructures, and to enable their effective transfer onto targeted substrates for further integration into van der Waals heterostructures and prototypal devices. With this objective, four main research directions have been initiated and are currently in progress: (i) investigating the role of triphenylamine functionalization on the formation of surface-confined organic frameworks (SCOFs); (ii) engineering and probing the physical properties of novel nanoporous graphene structures; (iii) fabricating and studying nanostructured carbon nitrides; and (iv) examining the influence of substrate type on the growth of molecular switch films, with the goal of achieving controllable tuning of properties in the resulting 2D materials
L’État de droit et la souveraineté numérique chinoise : une analyse de la stratégie de contrôle et d’extension de réseau numérique
No full textInternational audienceCet article propose une mise en perspective du modèle chinois de souveraineté numérique au regard des principes classiques de l’État de droit. À partir de l’étude des législations chinoises en matière de cybersécurité et de protection des données personnelles, ainsi que de l’initiative géopolitique de la « Digital Silk Road », il met en lumière un modèle normatif fondé sur deux dynamiques complémentaires : le renforcement du contrôle étatique sur les infrastructures et les flux numériques internes, et l’exportation de ce modèle à l’international par le biais de partenariats stratégiques. L’article propose également une conceptualisation des rapports contractuels noués par la Chine avec ses partenaires numériques, en analysant la manière dont une forme d’acquiescement — implicite ou structurel — peut émerger à travers l’acceptation de normes techniques, d’exigences réglementaires ou de logiques d’interdépendance
Integrated proteomics and metabolomics to evaluate the combined effect of propyl gallate and fumonisin B1 on colon inflammation in vitro and in vivo
No full textInternational audienc
MPC-based Anesthesiologists Imitating Control of Propofol and Remifentanil during Anesthesia Maintenance
No full textThis paper suggests a new formulation of a Model Predictive Control (MPC) strategy, allowing to design propofol and remifentanil infusion profiles in order to control the Bispectal Index (BIS). This new formulation, based on a range cost, allows to reduce the sensitivity of the control profiles with respect to the BIS measurement noise. Furthermore, it allows to better represent the anesthesiologists behavior in practice, who usually do not over-react to small changes in the measured health indicators. The paper assesses numerically this formulation, by comparing its performance, in an uncertain setting, to standard set-point tracking based MPC strategies.</div
Adaptive Neural-Network-Based Fault Tolerant Control for Autonomous Vehicles With Dynamic Output Constraints
No full textInternational audienceVehicle reliability and safety are critical to the development and application of autonomous driving technologies. This paper presents an adaptive neural network (NN) fault-tolerant controller design for autonomous vehicles, where dynamic output constraints are specifically considered to keep the vehicle within safety boundaries. First, considering the actuator faults, a vehicle dynamics model that incorporates system uncertainties and external disturbances is established. The fault-tolerant controller is then designed by integrating a radial-basis-function NN and a nonlinear disturbance observer to simultaneously address faults, uncertainties, and disturbances. Second, a barrier function is constructed to handle the vehicle output constraints, and a novel distance-based trigger function is introduced to activate the barrier function, enabling automatic smooth switching between constrained and unconstrained areas during path tracking. The direct Lyapunov method is subsequently employed to verify the boundedness of the closed-loop vehicle system as well as the parameter updating law. Finally, the effectiveness of the proposed control method is validated through both Co-simulation and experimental tests
: Explorer la médiation éthique d’Ubuntu face aux algorithmes organisationnels du point de vue info-communicationnel
No full textInternational audienceCyber Management et Bien-être au TravailCette recherche explore comment la philosophie Ubuntu peut servir de médiation éthique face aux effets des algorithmes sur le bien-être, la solidarité et la dignité au travail.Analyse qualitative, audit algorithmique, visualisations 2D/3D.Prix Communication – Doctoriales 2025Pour la clarté et l’impact de la présentation
Optimizing Reverse Logistics: A Multi-Objective Approach for Sustainable Inventory Routing problem
No full textInternational audienceThis study addresses the optimization of reverse logistics within the framework of the circular economy by focusing on the Inventory Routing Problem with Pickup and Delivery and Time Windows (IRP-PD-TW). While forward logistics systems have been extensively explored, the reverse flow of goods—central to sustainable and circular supply chains—remains underdeveloped. This research proposes a bi-objective mathematical model that integrates both economic and social dimensions by simultaneously minimizing total logistics costs (including transport and inventory holding) and improving driver well-being through reduced fatigue and scheduled rest periods.Two solution methodologies are applied: lexicographic optimization, which prioritizes objectives based on predefined hierarchies, and the Non-dominated Sorting Genetic Algorithm II (NSGA-II), used to generate Pareto-efficient solutions. Numerical experiments conducted on benchmark instances show that the proposed exact method outperforms metaheuristic approaches in both cost efficiency and driver well-being. The results validate the model's ability to support sustainable decision-making in closed-loop logistics systems.This work contributes to the development of holistic reverse logistics strategies, offering a practical and socially responsible framework for supply chain optimization. Future research directions include extending the model to dynamic and large-scale networks and integrating emerging technologies such as blockchain and IoT to enhance traceability, efficiency, and compliance with sustainability objectives
From active materials to microsystems: development, integration, and applications
No full textInternational audienceThis work explores the continuum from bio-inspired concepts to functional microsystems, highlighting the potential of active materials for soft and adaptive technologies. Drawing inspiration from biological systems, particularly muscle based actuation (Conducting polymer-based transducers), we investigate soft actuators capable of producing smooth and controllable motion. Various gripping prototypes are presented, demonstrating their relevance for manipulation tasks in confined or delicate environments. The talk further addresses the development of implantable and minimally invasive medical tools, outlining the full process from conceptual design to microfabrication. In parallel, the integration of soft sensors and surgical robotic components illustrates the transition toward multifunctional, intelligent devices. Finally, a bio-inspired artificial insect demonstrator exemplifies how biological principles can be translated into robotic systems at small scale. The presentation concludes with future perspectives and contributions toward the next generation of adaptive, integrated, and life-inspired microsystems
Phase-field simulations for RF switches: highlighting the benefits of GeTe over GST
No full textInternational audienceTo better understand the crystallization mechanism of phase change material, the phase field method is used for the first time in simulations of the switching dynamics of RF switches. This method allows reproducing the nucleation and growth of the crystalline phase during amorphization and crystallization of the PCM. In this work, the quenching behavior of GeTe is compared with that of GST. The presented observations are consistent with the expected crystallization behavior and kinetics of each material. This work demonstrates the interest of the phase field model in PCM RF Switches simulation and highlights the interest of using GeTe rather than GST to obtain better amorphization quality in phase change materials
Adaptive neural sliding controller for coaxial-rotor aircraft system with input saturation: a model-free control approach
No full textInternational audienceThis paper presents the design of a model-free controller using radial basis function neural networks (RBFNNs) and sliding mode (SM) estimators for a coaxial-rotor aircraft system in the presence of unknown dynamics and input saturation. The proposed control approach decomposes the overall dynamic of the aircraft system into a set of interconnected subsystems, employing a nonlinear feedback control approach. The SM estimator is introduced for each subsystem to approximate the unknown dynamic functions with the saturation error provided, while an adaptive RBFNN is incorporated to compensate the estimation error. The global asymptotical stability of the closed-loop control system is established using Lyapunov theory. Numerical simulations conducted on a coaxial-rotor system template demonstrate the robustness and effectiveness of the proposed control strategy.</div