Academic literature on the topic 'Sous-espace de réseau de neurones'
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Journal articles on the topic "Sous-espace de réseau de neurones":
Soudani, Azeddine, Saadi Bougoul, and Jean-Luc Harion. "Réduction des étalonnages multiples en mesures simultanées dans une couche limite turbulente d'un mélange air - hélium." Journal of Renewable Energies 6, no. 2 (December 31, 2003): 77–94. http://dx.doi.org/10.54966/jreen.v6i2.963.
Ancori, Bernard. "Espace-temps d’un réseau sociocognitif complexe. II : Temporalités historiques et entropie sociocognitive." Nouvelles perspectives en sciences sociales 4, no. 1 (January 13, 2009): 9–76. http://dx.doi.org/10.7202/019639ar.
Bernier-Renaud, Laurence, Jean-Pierre Couture1, and Jean-Charles St-Louis. "Le réseau des revues d’idées au Québec : esquisse d’une recherche en cours." Globe 14, no. 2 (April 10, 2012): 59–83. http://dx.doi.org/10.7202/1008782ar.
Thiong-Kay, Laurent. "Facebook comme appui médiatique de l’action collective : fabrique des groupements et intégration du mouvement contre le barrage de Sivens." Les Enjeux de l'information et de la communication N° 23/4, no. 1 (October 2, 2023): 91–108. http://dx.doi.org/10.3917/enic.034.0091.
Métayer, Christine. "Un espace de vie : les charniers du cimetière des SS. Innocents à Paris, sous l’Ancien Régime." Journal of the Canadian Historical Association 4, no. 1 (February 9, 2006): 183–206. http://dx.doi.org/10.7202/031062ar.
Laïdi, Maamar, and Salah Hanini. "Approche neuronale pour l’estimation des transferts thermiques dans un fluide frigoporteur diphasique." Journal of Renewable Energies 15, no. 3 (October 23, 2023): 513–20. http://dx.doi.org/10.54966/jreen.v15i3.340.
Croteau, Jean-Philippe. "Les écoles privées juives à Montréal (1874-1939) : des instances de reproduction identitaire et de production sociale ?" Articles 78, no. 2 (November 19, 2012): 81–101. http://dx.doi.org/10.7202/1013045ar.
Bray, Bernard. "Espaces épistolaires." Études littéraires 34, no. 1-2 (February 23, 2004): 133–51. http://dx.doi.org/10.7202/007558ar.
Cortezzi, Francisco. "CIRCULATION COMMERCIALE DE L'AÇAI BRESILIEN (1999-2016) : LE RESEAU GEOGRAPHIQUE INTERNATIONAL, SES NŒUDS, SES FLUX ET SES NOUVELLES FORMES DE PRODUCTION ET DE REPRODUCTION DANS L’ESPACE." Revista GeoUECE 9, no. 16 (September 23, 2020): 33–62. http://dx.doi.org/10.59040/geouece.2317-028x.v9.n16.33-62.
Djeriri, Youcef, and Zinelaabidine Boudjema. "Commande robuste par la logique floue et les réseaux de neurones artificiels de la GADA : étude comparative." Journal of Renewable Energies 20, no. 1 (October 12, 2023): 147–60. http://dx.doi.org/10.54966/jreen.v20i1.616.
Dissertations / Theses on the topic "Sous-espace de réseau de neurones":
Gaya, Jean-Baptiste. "Subspaces of Policies for Deep Reinforcement Learning." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS075.
This work explores "Subspaces of Policies for Deep Reinforcement Learning," introducing an innovative approach to address adaptability and generalization challenges in deep reinforcement learning (RL). Situated within the broader context of the AI revolution, this research emphasizes the shift toward scalable and generalizable models in RL, inspired by advancements in deep learning architectures and methodologies. It identifies the limitations of current RL applications, particularly in achieving generalization across varied tasks and domains, proposing a paradigm shift towards adaptive methods.The research initially tackles zero-shot generalization, assessing deep RL's maturity in generalizing across unseen tasks without additional training. Through investigations into morphological generalization and multi-objective reinforcement learning (MORL), critical limitations in current methods are identified, and novel approaches to improve generalization capabilities are introduced. Notably, work on weight averaging in MORL presents a straightforward method for optimizing multiple objectives, showing promise for future exploration.The core contribution lies in developing a "Subspace of Policies" framework. This novel approach advocates for maintaining a dynamic landscape of solutions within a smaller parametric space, taking profit of neural network weight averaging. Functional diversity is achieved with minimal computational overhead through weight interpolation between neural network parameters. This methodology is explored through various experiments and settings, including few-shot adaptation and continual reinforcement learning, demonstrating its efficacy and potential for scalability and adaptability in complex RL tasks.The conclusion reflects on the research journey, emphasizing the implications of the "Subspaces of Policies" framework for future AI research. Several future directions are outlined, including enhancing the scalability of subspace methods, exploring their potential in decentralized settings, and addressing challenges in efficiency and interpretability. This foundational contribution to the field of RL paves the way for innovative solutions to long-standing challenges in adaptability and generalization, marking a significant step forward in the development of autonomous agents capable of navigating a wide array of tasks seamlessly
Kirchhofer, Simon. "Conception d'une prothèse bio-inspirée commandée par réseaux de neurones exploitant les signaux électromyographiques." Thesis, Université Clermont Auvergne (2017-2020), 2020. http://www.theses.fr/2020CLFAC058.
Research on upper-body prosthetic device is commonly divided in two categories: The prosthesis mechatronic conception and the human-machine interface dedicated to the control. This PhD thesis aims to bring together these two fields of research. The first step deals with control signals. Thus, a database containing electromyographic sequences and vision based joint coordinate measurements was created. Then, an artificial neural network achieves the motion estimation from electromyographic sequences. Accordingly, an under-actuated bio-inspired hand architecture is proposed to copy an organic hand motion while ensuring a grasping force distribution. This innovative approach allows to optimize the synergies imitation and proposes a control more intuitive for active prosthesis users
Tzvetanov, Tzvetomir. "Etude psychophysique et modélisation des traitements de bas niveau sous-tendant la vision des contours des objets." Phd thesis, Université Louis Pasteur - Strasbourg I, 2003. http://tel.archives-ouvertes.fr/tel-00004179.
Ouss, Etienne. "Caractérisation des décharges partielles et identification des défauts dans les PSEM sous haute tension continue." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC024.
The framework of this thesis is the monitoring of High-Voltage, Direct Current (HVDC) Gas-Insulated Substations (GIS). The availability of these equipment is crucial for electrical networks operators. That is why they need a preventive diagnosis tool. The solution must be able to detect and identify the insulation defects, so that an appropriate maintenance can be planned. The last 40 years have seen Partial Discharges (PD) measurement become a classic monitoring tool for AC GIS. Unfortunately, there is a lack of scientific information about PD in HVDC GIS, and the known defect identification techniques are very specific to the AC environment. New techniques are thus needed in DC.This thesis aimed to characterize partial discharges in DC gas-insulated substations, and to develop an automatic defect identification tool. The first step of this work was the development of a partial discharge measuring bench. The complete study has been performed in a GIS section, so that the results can be directly applied to industrial equipment. Two kinds of defect have been investigated: protrusions on the high-voltage conductor, and free metallic particles. The influence of parameters such as gas nature and pressure, voltage level and polarity has been evaluated. First, PD have been measured in conformity with the IEC 60270 standard, and the relevance of this method in a DC environment has been evaluated. Then, other measuring chains have been used to improve the characterization of partial discharges: a steady-state current measurement, a high-frequency current measurement, a light measurement and a measurement of Ultra-High Frequency (UHF) waves. Finally, a relevant signature for defect identification has been designed and extracted from DP recordings. A database has been constituted, and an automated recognition algorithm has been implemented.The results show that the conventional PD measurement technique is not fully adapted to partial discharges detection in DC, corona discharges being the most problematic situation. Nevertheless, this method has brought enough information to start the characterization of PD. The limitations of the conventional method have been explained thanks to the results of the other measurements. These other experimental results have led to an actual improvement of the characterization of protrusion and particle-generated partial discharges. An effective automated defect classification solution has been implemented. The signature is derived from the q(Δt) diagram that has been extracted from the data obtained with the partial discharge conventional measurement. The identification algorithm has a neural network structure
Dariouchy, Abdelilah. "Utilisation des réseaux de neurones artificiels en diffusion acoustique et en agriculture sous serres." Le Havre, 2008. http://www.theses.fr/2008LEHA0002.
This study is devoted to the models development able to predict the reduced cut-off frequencies and the forms functions for submerged tubes in water and to predict the acoustic spectrum retrodiffused by two welded plates on the one hand, and on the other hand, to predict the time series of the internal temperature and the internal moisture of the tomato greenhouse in a semi-arid area. To validate our results, the representation time-frequency of Wigner-Ville is used to compare the form function calculated by the traditional analytical method and that predicted by ANN. The control of the ANN models allows us now to consider other applications according to the requests
Demartines, Pierre. "Analyse de données par réseaux de neurones auto-organisés." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0129.
Incerti, Sébastien. "Mesure de la fonction de structure polarisée g1n du neutron par l'expérience E154 au SLAC." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 1998. http://tel.archives-ouvertes.fr/tel-00002876.
Jouini, Manel. "Reconstruction des images couleur de l'eau sous les nuages : recours à des méthodes neuronales." Paris 6, 2011. http://www.theses.fr/2011PA066508.
Giovannini, Francesco. "Modélisation mathématique pour l'étude des oscillations neuronales dans des réseaux de mémoire hippocampiques pendant l'éveil et sous anesthésie générale." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0182/document.
Memory is commonly defined as the ability to encode, store, and recall information we perceived. As we experience the world, we sense stimuli, we witness events, we ascertain facts, we study concepts, and we acquire skills. Although memory is an innate and familiar human behaviour, the interior workings of the brain which provide us with such faculties are far from being fully unravelled. Experimental studies have shown that during memory tasks, certain brain structures exhibit synchronous activity which is thought to be correlated with the short-term maintenance of salient stimuli. The objective of this thesis is to use biologically-inspired mathematical modelling and simulations of neural activity to shed some light on the mechanisms enabling the emergence of these memory-related synchronous oscillations. We focus in particular on hippocampal mnemonic activity during the awake state, and the amnesia and paradoxical memory consolidation occurring under general anaesthesia. We begin by introducing a detailed model of a type of persistent-firing pyramidal neuron commonly found in the CA3 and CA1 areas of the hippocampus. Stimulated with a brief transient current pulse, the neuron displays persistent activity maintained solely by cholinergic calcium-activated non-specific (CAN) receptors, and outlasting the stimulus for long delay periods (> 30s). Our model neuron and its parameters are derived from experimental in-vitro recordings of persistent firing hippocampal neurons carried out by our collaborators Beate Knauer and Motoharu Yoshida at the Ruhr University in Bochum, Germany. Subsequently, we turn our attention to the dynamics of a population of such interconnected pyramidal-CAN neurons. We hypothesise that networks of persistent firing neurons could provide the neural mechanism for the maintenance of memory-related hippocampal oscillations. The firing patterns elicited by this network are in accord with both experimental recordings and modelling studies. In addition, the network displays self-sustained oscillatory activity in the theta frequency. When connecting the pyramidal-CAN network to fast-spiking inhibitory interneurons, the dynamics of the model reveal that feedback inhibition improves the robustness of fast theta oscillations, by tightening the synchronisation of the pyramidal CAN neurons. We demonstrate that, in the model, the frequency and spectral power of the oscillations are modulated solely by the cholinergic mechanisms mediating the intrinsic persistent firing, allowing for a wide range of oscillation rates within the theta band. This is a biologically plausible mechanism for the maintenance of synchronous theta oscillations in the hippocampus which aims at extending the traditional models of septum-driven hippocampal rhythmic activity. In addition, we study the disruptive effects of general anaesthesia on hippocampal gamma-frequency oscillations. We present an in-depth study of the action of anaesthesia on neural oscillations by introducing a new computational model which takes into account the four main effects of the anaesthetic agent propofol GABAergic hippocampal interneurons. Our results indicate that propofol-mediated tonic inhibition contributes to enhancing network synchronisation in a network of hippocampal interneurons. This enhanced synchronisation could provide a possible mechanism supporting the occurrence of intraoperative awareness, explicit memory formation, and even paradoxical excitation under general anaesthesia, by facilitating the communication between brain structures which should supposedly be not allowed to do so when anaesthetised. In conclusion, the findings described within this thesis provide new insights into the mechanisms underlying mnemonic neural activity, both during wake and anaesthesia, opening compelling avenues for future work on clinical applications tackling neurodegenerative memory diseases, and anaesthesia monitoring
Giovannini, Francesco. "Modélisation mathématique pour l'étude des oscillations neuronales dans des réseaux de mémoire hippocampiques pendant l'éveil et sous anesthésie générale." Electronic Thesis or Diss., Université de Lorraine, 2017. http://www.theses.fr/2017LORR0182.
Memory is commonly defined as the ability to encode, store, and recall information we perceived. As we experience the world, we sense stimuli, we witness events, we ascertain facts, we study concepts, and we acquire skills. Although memory is an innate and familiar human behaviour, the interior workings of the brain which provide us with such faculties are far from being fully unravelled. Experimental studies have shown that during memory tasks, certain brain structures exhibit synchronous activity which is thought to be correlated with the short-term maintenance of salient stimuli. The objective of this thesis is to use biologically-inspired mathematical modelling and simulations of neural activity to shed some light on the mechanisms enabling the emergence of these memory-related synchronous oscillations. We focus in particular on hippocampal mnemonic activity during the awake state, and the amnesia and paradoxical memory consolidation occurring under general anaesthesia. We begin by introducing a detailed model of a type of persistent-firing pyramidal neuron commonly found in the CA3 and CA1 areas of the hippocampus. Stimulated with a brief transient current pulse, the neuron displays persistent activity maintained solely by cholinergic calcium-activated non-specific (CAN) receptors, and outlasting the stimulus for long delay periods (> 30s). Our model neuron and its parameters are derived from experimental in-vitro recordings of persistent firing hippocampal neurons carried out by our collaborators Beate Knauer and Motoharu Yoshida at the Ruhr University in Bochum, Germany. Subsequently, we turn our attention to the dynamics of a population of such interconnected pyramidal-CAN neurons. We hypothesise that networks of persistent firing neurons could provide the neural mechanism for the maintenance of memory-related hippocampal oscillations. The firing patterns elicited by this network are in accord with both experimental recordings and modelling studies. In addition, the network displays self-sustained oscillatory activity in the theta frequency. When connecting the pyramidal-CAN network to fast-spiking inhibitory interneurons, the dynamics of the model reveal that feedback inhibition improves the robustness of fast theta oscillations, by tightening the synchronisation of the pyramidal CAN neurons. We demonstrate that, in the model, the frequency and spectral power of the oscillations are modulated solely by the cholinergic mechanisms mediating the intrinsic persistent firing, allowing for a wide range of oscillation rates within the theta band. This is a biologically plausible mechanism for the maintenance of synchronous theta oscillations in the hippocampus which aims at extending the traditional models of septum-driven hippocampal rhythmic activity. In addition, we study the disruptive effects of general anaesthesia on hippocampal gamma-frequency oscillations. We present an in-depth study of the action of anaesthesia on neural oscillations by introducing a new computational model which takes into account the four main effects of the anaesthetic agent propofol GABAergic hippocampal interneurons. Our results indicate that propofol-mediated tonic inhibition contributes to enhancing network synchronisation in a network of hippocampal interneurons. This enhanced synchronisation could provide a possible mechanism supporting the occurrence of intraoperative awareness, explicit memory formation, and even paradoxical excitation under general anaesthesia, by facilitating the communication between brain structures which should supposedly be not allowed to do so when anaesthetised. In conclusion, the findings described within this thesis provide new insights into the mechanisms underlying mnemonic neural activity, both during wake and anaesthesia, opening compelling avenues for future work on clinical applications tackling neurodegenerative memory diseases, and anaesthesia monitoring