Academic literature on the topic 'Détection de Chaos'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Détection de Chaos.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Détection de Chaos":
Pichard, Diane, and Ghita Benchekroun. "L’acromégalie chez le chat : une cause fréquente de diabète sucré ?" Le Nouveau Praticien Vétérinaire canine & féline 20, no. 85 (2023): 18–29. http://dx.doi.org/10.1051/npvcafe/2024004.
GOSSELIN, Marion, Serge CADET, Denis CARTIER, Yann DUMAS, Thierry GAUTROT, Frédéric RITZ, Mirham BLIN, et al. "Évaluation statistique d’un protocole de relevés bryologiques pour inventorier et suivre la biodiversité en forêt." Naturae, no. 18 (August 25, 2021). http://dx.doi.org/10.5852/naturae2021a18.
Dissertations / Theses on the topic "Détection de Chaos":
Després, Philippe. "Contrôle et détection du chaos." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ53937.pdf.
Millet, Nicolas. "Cavité résonnante pour la détection polarimétrique d'objets diélectriques dans le domaine des ondes millimétriques." Paris 6, 2008. http://www.theses.fr/2008PA066635.
Laurent, David. "CHAOS ONDULATOIRE ET DIFFUSION MULTIPLE EN CAVITÉ MICRO-ONDES : Expériences modèles et applications." Phd thesis, Université de Nice Sophia-Antipolis, 2007. http://tel.archives-ouvertes.fr/tel-00460414.
Hamadene, Wassila. "Systèmes chaotiques et méthode des récurrences : application à la détection précoce des crises d'épilepsie." Lille 1, 2005. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2005/50376-2005-194.pdf.
Halimi, Meriem. "Observation et détection de modes pour la synchronisation des systèmes chaotiques : une approche unifiée." Electronic Thesis or Diss., Université de Lorraine, 2013. http://www.theses.fr/2013LORR0182.
The work developed in this manuscript addresses the synchronization of chaotic systems. It is organized around two main axes: the observer synthesis and the mode detection. In a first step, we recall the main architectures of chaotic encryption systems and show how chaotic systems with polynomial nonlinearities or switched affine dynamics can be rewritten in a polytopic LPV form. A review of the main LMI based results for polytopic LPV observers synthesis is made. An extension to polytopic unknown input observers, both in the deterministic case and noisy or uncertain case, is proposed. These observers ensure chaos synchronization and information recovering in the framework of the following encryption systems: "parametric modulation", "chaotic switching", "two channels transmission" and "inclusion encryption". For affine switched systems used as a generator of chaos, the case where the discrete state is not available is considered. A unified presentation of mode detection methods based on parity spaces proposed in the literature for linear and affine switched discrete time systems is proposed. The problem of discernibility is the subject of a complete study. An approach to estimate time varying delays for affine switched discrete time systems, formulated in terms of mode detection, is proposed as a solution for delay injection encryption
Halimi, Meriem. "Observation et détection de modes pour la synchronisation des systèmes chaotiques : une approche unifiée." Phd thesis, Université de Lorraine, 2013. http://tel.archives-ouvertes.fr/tel-00942426.
Mogavero, Federico. "Nouvelles méthodes dans la détection d'exoplanètes par effet de microlentille gravitationnelle et vers une théorie statistique des orbites des planètes du système solaire." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066427.
This thesis deals with exoplanet detection and the statistical properties of planetary systems. In the first part of the dissertation, we present new developments in the technique of gravitational microlensing. We explore the potentialities of geosynchronous and low Earth orbit satellites to discover unusual systems, such as rogue planets and miniature planetary systems around low-mass brown dwarfs. We then propose two new approaches to image reconstruction, which could result in a precious speed-up when interpreting observational data. We first rediscover the not-well-known result of Asada (2002), demonstrating that the two-dimensional lens equation can be rewritten in terms of triangular systems via Labatie’s theorem. That allows to solve basically a single real polynomial equation, instead of the usual complex one. We then propose a technique of image reconstruction based on the resolution of a system of ordinary differential equations. This turns out to have a number of advantages, among them a straightforward application to the general case of N point-mass lenses. In the second part of the thesis, we take a first step towards a statistical theory of planetary architectures. We show that the microcanonical ensemble of secular dynamics in the solar system provides a very good guess of the probability density of the planet orbital elements over Gyr timescales. Since the future dynamics of our planets is essentially analogue to the gravitational excitation undergone by exoplanets during the final, gas-free phase of their formation, such a result constitutes a preliminary but valuable hint of the effectiveness of a statistical approach to planetary architectures
Kaddoum, Georges. "Contributions à l’amélioration des systèmes de communication multi-utilisateur par chaos : synchronisation et analyse des performances." Toulouse, INSA, 2008. http://eprint.insa-toulouse.fr/archive/00000245/.
Radiocommunications field is currently in full development. In recent years, many researchers have explored the possibility of using chaotic signals to transmit data, especially in a multi-user case. Among the various multiple access techniques, the CDMA (Code Division Multiple Access) allows different users to transmit simultaneously on the same frequency band. The sequences currently used for classical spread spectrum are the sequences known as pseudo-random binary sequences with low cross-correlation generated on the basis of a shift linear register (Gold sequences) or binary orthogonal sequences (Walsh codes). This thesis has focused on the study of a communication system with multi-user spread spectrum using chaotic generators as spreading sequences. The chaotic signals can be generated by iterative discrete systems modelled by discrete transformations. In a first step, we have studied various chaotic signals from different dynamical systems, / a priori / defined by traditional functions continuous or piece wise linear functions. Relying on the correlation properties and the energy distribution of chaotic signals, a comparative study between different chaotic sequences was made in the framework of chaos-based DS-CDMA systems. The purpose of this comparison is to provide necessary elements to choose the best sequence for a spread spectrum system under an Additive White Gaussian Noise (AWGN) channel. A simple method to rapidly and accurately predict the bit error rate for chaos-based DS-CDMA was proposed in single and multi-user cases. Further study on the energy distribution has resulted in an analytical expression of the bit error rate. These performances have been also been studied and extended to the multi-user case. In a second part, we have explored the synchronization process of chaotic dynamical systems. After reviewing the existing approaches in the literature, we have focused our attention on the study of different methods of digital integration in order to determine an appropriate method to achieve synchronization using coupling with a low a low computing charge. Finally, we have studied the synchronization process for chaos-based DS-CDMA system. We have proposed receivers incorporating synchronization units similar to the synchronization units (/ acquisition and tracking /) used in conventional spread spectrum systems. These synchronization units are using simultaneously a classical binary pseudo-random sequence together with a chaotic sequence in order to achieve and maintain synchronization. These techniques were compared to a similar existing method recently proposed in literature. We have demonstrate the improvement in performance brought by our proposed system, including the fact that this system is also operational in the asynchronous case
Ismail, Ali Rida. "Commensurable and Chaotic Nano-Contact Vortex Oscillator (NCVO) study for information processing." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0003.
The amount of data used in information technology is increasing dramatically. This comes with the proliferation of highly advanced electronic technologies. The thermal issues, rising as an effect of such large data processes, impose the usage of novel technologies and paradigms in place of CMOS circuits. Spintronic devices are one of many alternatives proposed so far in the literature. In this work, we consider a spintronic device called nano-contact vortex oscillator (NCVO), which has recently begun to gain attention due to its rich and variable dynamics. This oscillators is operated by an bias DC current and subjected in a magnetic field, that determines it output dynamics. The practical use of the NCVO requires the existence of an accurate model that imitates its output magnetization and the vortex's trajectory rotating around the center in the upper layer of the device. These two variables are needed for the calculation of the equivalent resistance of the NCVO. For that, we build in this PhD work a model for the NCVO producing these two variables using a reservoir computing approach called conceptor-driven network. The network is trained on NCVO data gained by micromagnetic simulation. The built model successfully captures the NCVO dynamics in its different regimes (chaotic, periodic, and quasi- periodic) with an easy shift between regimes. The same network is used then for the detection of chaos in the input-times series. The proposed chaos-detection method has shown to be efficient and more robust compared to existing methods. Finally, the NCVO model is exploited for truly random number generation (TRNG) where a hardware design, fed by a chaotic signal generated by the model, is proposed. This design has shown the ability to compete existing RNG techniques in terms of speed, cost, and quality
Xu, Yanjun. "Modulation and detection schemes based on chaotic attractors properties : application to wideband transmissions." Toulouse, INSA, 2009. http://eprint.insa-toulouse.fr/archive/00000278/.
In the past twenty years, chaos-based communication systems have been studied, considering the possibility of generating wideband signals by simple electronic circuits, hence low complexity in transceiver. The aim of this thesis is to study the chaos-based wideband transmission systems relying on the properties of chaotic attractors. Firstly, a dynamical system is selected and studied, allowing to generate the chaotic signals with a periodic component. The analysis of such chaotic cyclic attractors (CCA) shows the specific properties. Then, two CCA-based modulation schemes are proposed, with the simple noncoherent detections realized by observing the specific properties of the received signals. The performance evaluation of CCA-based systems in the additive white Gaussian noise (AWGN) channel shows a better noise performance with long symbol duration, compared to the one of differentially chaos shift keying (DCSK). In addition, they have a comparable multipath performance in the 2. 4 GHz ISM environment