Letteratura scientifica selezionata sul tema "Systèmes à trois échelles de temps"
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Articoli di riviste sul tema "Systèmes à trois échelles de temps":
PEYRAUD, J. L., e F. PHOCAS. "Dossier " Phénotypage des animaux d'élevage "". INRAE Productions Animales 27, n. 3 (25 agosto 2014): 179–1890. http://dx.doi.org/10.20870/productions-animales.2014.27.3.3065.
FAVERDIN, P. "Dossier : Palatabilité et choix alimentaires - Avant-propos". INRAE Productions Animales 9, n. 5 (20 ottobre 1996): 337–38. http://dx.doi.org/10.20870/productions-animales.1996.9.5.4072.
Dupont, J., J. Smitz, A. N. Rousseau, A. Mailhot e G. Gangbazo. "Utilisation des outils numériques d'aide à la décision pour la gestion de l'eau". Revue des sciences de l'eau 11 (12 aprile 2005): 5–18. http://dx.doi.org/10.7202/705326ar.
Mullon, Christian. "Sur la modélisation de systèmes complexes à différentes échelles d’espace et de temps". Revue d'Écologie (La Terre et La Vie) 50, n. 3 (1995): 251–59. http://dx.doi.org/10.3406/revec.1995.2175.
Kelly, James. "Penser les paysages avec les trois synthèses du temps de Deleuze". Journal of French and Francophone Philosophy 29, n. 1-2 (10 dicembre 2021): 130–47. http://dx.doi.org/10.5195/jffp.2021.965.
Louder, Dean R., Michel Bisson e Pierre La Rochelle. "Analyse centrographique de la population du Québec de 1951 à 1971". Cahiers de géographie du Québec 18, n. 45 (12 aprile 2005): 421–44. http://dx.doi.org/10.7202/021221ar.
Violette, Louis. "Abebe Bikila: Portrait d’un Champion Olympique en Témoin de son Temps". Sport History Review 51, n. 2 (1 novembre 2020): 278–99. http://dx.doi.org/10.1123/shr.2019-0043.
Prunier, Delphine. "Les systèmes de mobilité familiaux dans les campagnes du Nicaragua". Emulations - Revue de sciences sociales, n. 17 (22 dicembre 2016): 97–114. http://dx.doi.org/10.14428/emulations.017.002.
Borderie, Quentin, Rowena Banerjea, Stéphane Bonnet, Yannick Devos, Cristiano Nicosia, Christophe Petit, Ferréol Salomon, Nathalie Schneider, Barbora Wouters e Patrice Wuscher. "Géoarchéologies des contextes urbains : mieux comprendre les modalités de l'artificialisation des géosystèmes". Archimède. Archéologie et histoire ancienne 7 (9 giugno 2020): 141–57. http://dx.doi.org/10.47245/archimede.0007.act.04.
Alary, Véronique, e Denis Gautier. "Évaluer la contribution de l’élevage au développement des régions sèches : indicateurs en vue de politiques publiques adaptées". Perspective, n. 60 (2023): 1–4. http://dx.doi.org/10.19182/perspective/37106.
Tesi sul tema "Systèmes à trois échelles de temps":
Adhikari, Bikash. "Time-scale phenomena in the synchronization of multi-agent systems". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0079.
Synchronization of multi-agent systems has received significant attention in the literature due to applications in different domains such as physics, biology, economics, medicine, telecommunication, etc. These multi-agent systems can be homogeneous (identical dynamics) or heterogeneous (non-identical dynamics). The major difficulties that arise in the control and analysis of the multi-agent systems are due to the heterogeneity and the network size. Heterogeneous networked systems have more complex dynamic behavior, and asymptotic synchronization may not be guaranteed. At the same time, the large network size increases the computational effort required to study the asymptotic behavior of the network. Also, the communication structure between the agents, which is important for synchronization, can be time-varying, adding more complexity to the problem. In this manuscript, we address these problems utilizing the time-scale phenomena in the synchronization of the multi-agent system. We propose a reduced-order model that approximates the synchronized behavior of the network with both fixed and time-varying topologies and provides a computationally efficient control design strategy based on the time-scale behavior of the networks. The first result presents the emergent dynamic based approximation of the heterogeneous linear multi-agent systems connected over time-varying topology. Using a coordinate transformation, the closed-loop network dynamics is reformulated into mean-field and error dynamics. Then by choosing a sufficiently large coupling gain, we represent the dynamics in new coordinates in standard singular perturbation form. This allows decoupling into reduced-order slow and fast dynamics using time-scale separation. Moreover, due to high gain, the network is practically synchronized, and its synchronized behavior can be approximated by reduced-orderslow dynamics independent of the control gains. The results are ensured for strongly connected networks under fairly mild assumptions by introducing a minimum dwell time between two consecutive switches.The second result proposes a novel three time-scale modeling of the clustered networks. Using a two-stage coordinate transformation, the network dynamics is reformulated into new coordinates, namely, mean-field, intra-cluster error, and inter-cluster error dynamics. Then with a suitable choice of parameters, we show that the network dynamics can be represented in a two-parameter standard singular perturbation form in the new coordinate system. The mean-field dynamics, which is the network's long-term behavior, evolve on the slowest time- scale. The intra-cluster error dynamics, which characterize the synchronization inside clusters, evolve on the fastest time scale. Finally, the inter-cluster error dynamics, which characterizes the synchronization between clusters, is fast with respect to the mean-field one and slow with respect to the intra-cluster one.In the final result, we present a computationally efficient control design strategy for the clustered network. We design a composite synchronizing controller with two terms: one responsible for the intra-cluster synchronization (internal) and the other achieving the synchronization between clusters (external). The internal controller does not require much computational effort since an analytic expression describes it. The external controller, however, is designed through a satisfaction equilibrium approach. In other words, the internal and external controllers are independently designed, and they ensure a guaranteed satisfactory cost for each cluster
Mehidi, Noureddine. "Perturbations singulières dans des systèmes différentiels à plusieurs échelles de temps". Pau, 1995. http://www.theses.fr/1994PAUUA004.
El, Moudni Abdellah. "Contribution à la modélisation et à l'analyse des systèmes discrets à échelles de temps multiples : application à la commande optimale". Lille 1, 1985. http://www.theses.fr/1985LIL10035.
Petit, Gérard. "Observations VLBI des pulsars millisecondes pour le raccordement des systèmes de référence célestes et la stabilité des échelles de temps". Observatoire de Paris, 1994. https://hal.science/tel-02095454.
Bouayad, Abdelali. "Étude comparative de méthodes d'analyse de systèmes à échelles de temps multiples : contribution à l'élaboration d'un processus d'aide à la simplification de modèles". Lille 1, 1990. http://www.theses.fr/1990LIL10058.
Guesbaoui, Habib. "Contribution a la mise sous forme standard des systèmes à multi-échelles de temps : application a la modélisation des machines alternatives". Vandoeuvre-les-Nancy, INPL, 1992. http://www.theses.fr/1992INPL015N.
Taousser, Fatima Zohra. "Analyse de stabilité des systèmes à commutations sur un domaine de temps non-uniforme". Thesis, Valenciennes, 2015. http://www.theses.fr/2015VALE0038/document.
This thesis deals with the stability analysis of switched systems that evolve on non uniform time domain by introducing the time scale theory. We are interested mainly in dynamical linear switched systems defined on particular time scale T = P{tσk ,tk+1} = ∪∞k=0[tσk, tk+1]. The studied system switches between a continuous-time dynamical subsystem on the intervals ∪∞k=0[tσk, tk+1[ and a discrete-time dynamical subsystem on instants ∪∞k=0{tk+1} (a discrete time) with a time-varying discrete step. In a first part, sufficient conditions are given to guarantee the exponential stability of this class of switched systems. Then necessary and sufficient conditions for stability are given by determining a region of exponential stability. In the second part, the stability of this class of switched systems with nonlinear uncertainties, is treated using majoration of the solution, and after that by introducing the approach of a common Lyapunov function. The third part is devoted to the consensus problem under intermittent information transmissions where the closed-loop multi-agent system can be represented as a switched system using a combination of linear continuous-time and linear discrete-time systems
Malloci, Ivan. "Sur les systèmes à commutation à deux échelles de temps : une application au contrôle de guidage de bande dans un laminoir à chaud". Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2009. http://tel.archives-ouvertes.fr/tel-00439457.
Malloci, Ivan. "Sur les systèmes à commutation à deux échelles de temps : une application au contrôle de guidage de bande dans un laminoir à chaud". Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL080N.
This Ph.D. thesis deals with a certain number of problems arising in practical implementation of control systems: multi time scale phenomena, sudden modifications on the system dynamics, discontinuities on the control signal due to controller switchings, the need of design a limited number of controllers in spite of a wide variation on the physical parameters. In order to illustrate the validity of the obtained results, we resort to a real problem concerning the steel production framework, the robust steering control of a hot strip finishing mill. First, a convex solution of the linear quadratic control design for discrete two time scale systems is proposed. Hence, we address the stability problem of two time scale switched systems. We show that stability of the slow and fast switched subsystems under arbitrary switching rules does not imply the stability of the corresponding two time scale switched system in the singular perturbation form. An additional constraint, independent of the value of the singular parameter and of the switching rule, is provided in terms of linear matrix inequalities. We also introduce a bumpless transfer method for switched systems aiming at reducing the discontinuities on the control signal. Dwell time conditions assessing the asymptotic stability of the closed loop switched system are established. The practical contribution of this thesis, the robust steering control design, exploits most of previous results. The objective is to guarantee the stability of the hot strip mill system and improve the quality of the rolled products
Köksal, Ersöz Elif. "A mathematical study on coupled multiple timescale systems, synchronization of populations of endocrine neurons". Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066516/document.
This dissertation investigates synchronization properties of slow-fast oscillators inspired from neuroendocrinology and neuronal dynamics, focusing on the effects of canard phenomena and dynamic bifurcations on the collective behavior. We start from a 4-dimensional system which accounts for the qualitative and quantitative dynamical features of the secretion pattern of the neurohormone GnRH (gonadotropin releasing hormone) along a whole ovarian cycle. This model involves 2 FitzHugh-Nagumo oscillators with different timescales. Unidirectional coupling from the slow oscillator (representing the mean-field activity of a population of regulating neurons) to the fast oscillator (representing the mean-field activity of a population of the secreting neurons) gives a three timescale structure. The behavior of the fast oscillator is characterized by an alternation between a relaxation cycle and a quasi-stationary state which introduces canard-mediated transitions in the model; these transitions have a strong impact on the secretion pattern of the 4-dimensional system. We make a first step forward in multiscale modeling (in space) of the GnRH system, namely, we extend the original system to 6 dimensions by considering two distinct subpopulations of secreting neurons receiving the same signal from the regulating neurons. This step allows us to enrich further the GnRH secretion pattern while keeping a compact dynamic framework and preserving the sequence of neurosecretory events captured by the 4-dimensional model, both qualitatively and quantitatively. An initial analysis of the extended 6-dimensional GnRH model is presented in Chapter 2, where we prove using a 5D minimal model the existence of canard trajectories in coupled systems with folded singularities. Coupling causes separation of trajectories corresponding to each secretor by driving them to different sides of the maximal canard (associated with either a folded-node or a folded-saddle singularity). We explore the impact of the relationship between canard structures and coupling on the collective secretion pattern of the 6-dimensional model. We identify two different sources of canard-mediated (de)synchronization in the secretory events, which depend on the type of underlying folded singularity. In Chapter 3, we attempt to model complex behaviors of the GnRH secretion not captured by the 4-dimensional model, namely, a surge with 2 bumps and partial desynchronization before the surge, by using the 6-dimensional model previously constructed. Regulatory-dependent asymmetric coupling functions and heterogeneity in the secretor subpopulations are essential for obtaining such a 2-bump surge. During the pulsatile regime, we find that the slowly varying regulatory signal causes a dynamic bifurcation, which is responsible for loss of synchrony in asymmetrically coupled nonidentical secretors. We introduce analytic and numerical tools to shape and quantify the additional features embedded within the whole secretion pattern
Libri sul tema "Systèmes à trois échelles de temps":
Maurer, Bruno, e Christian PUREN. CECR : par ici la sortie ! Editions des archives contemporaines, 2019. http://dx.doi.org/10.17184/eac.9782813003522.
Capitoli di libri sul tema "Systèmes à trois échelles de temps":
Gin, Stéphane, Delphine Neff, Philippe Dillmann e Aurélie Verney-Caron. "Les analogues naturels et archéologiques, outils privilégiés pour la prédiction du comportement à long terme des matériaux". In Regards croisés: quand les sciences archéologiques rencontrent l'innovation, 73–98. Editions des archives contemporaines, 2017. http://dx.doi.org/10.17184/eac.3791.
N’Da, Konan Éric, e Sidiky Diarassouba. "Cours intensifs d’anglais en Côte d’Ivoire : quelle légitimité pour la didactique et l’apprenant ?" In L’enseignement-apprentissage en/des langues européennes dans les systèmes éducatifs africains : place, fonctions, défis et perspectives, 109–26. Observatoire européen du plurilinguisme, 2020. http://dx.doi.org/10.3917/oep.kouam.2020.01.0109.
BARRERE, Christian. "Covid-19 : le retour du collectif". In Les épidémies au prisme des SHS, 155–66. Editions des archives contemporaines, 2022. http://dx.doi.org/10.17184/eac.6001.