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Dissertations / Theses on the topic 'Chaos engineering'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Monge, Solano Ignacio, and Enikő Matók. "Developing for Resilience: Introducing a Chaos Engineering tool." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20808.

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Software complexity continues to accelerate, as new tools, frameworks, and technologiesbecome available. This, in turn, increases its fragility and liability. Despite the amount ofinvestment to test and harden their systems, companies still pay the price of failure. Towithstand this fast-paced development environment and ensure software availability, largescalesystems must be built with resilience in mind. Chaos Engineering is a new practicethat aims to assess some of these challenges. In this thesis, the methodology, requirements,and iterations of the system design and architecture for a chao

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2

Knapen, Adriaan. "Chaos Engineering for Containerized Applications with Multi-Version Deployments." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291281.

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It is common practice to use versioning policies to create unique identifiers for applications running in production. Many times the schema used for the versioning identifier also includes information which allows one to infer the impact of the changes bundled in this new version. One well known and frequently used versioning policy is semantic versioning (SemVer), which, if properly adhered to, can be used to determine which different versions can be used interchangeably. However, many systems depending on the semantic versions of their applications do not explore the version compatibility in

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3

Yorke, Rory. "Chaos control using local polynomial approximation." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5075.

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Includes bibliographical references.<br>Chaotic systems may be defined as those whose behaviour is sensitively dependent on initial conditions. Such systems may be made periodic using small input perturbations, as proposed in [OGY90]; this is called Ott-Grebogi-Yorke (OGY) chaos control. The original method used a linear model for controller design; a later development of chaos control was [CCdF99], in which a polynomial model is used. This dissertation proposes using local Taylor polynomial models as a basis for chaos control.

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Simonsson, Jesper. "Observability and Chaos Engineering for System Calls in Containerized Applications." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263093.

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Chaos engineering is about testing the resilience of systems in production to see if they perform as expected during changing conditions. Container usage is becoming more common and as such applying principles of chaos engineering to their usage is important. In this thesis we investigate something that every containerized application uses, system calls and their possible perturbations consisting of the tuple (s, e, d), a system call, error code and delay. The perturbations consist of 9 different system calls, 7 error codes and 3 possible delays. Targets for these perturbations are mainly cont

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Weinstein, Yaakov Shmuel 1974. "The quantum Fourier transform and quantum chaos." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17023.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2003.<br>Includes bibliographical references (p. 127-133).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>In this thesis I study control of quantum systems while implementing complex quantum operations. Through experimental implementations of such operations, I test the accuracy of control and provide methods for identifying the type and strength of experimental errors. The centerpiece of this work is the

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Dingle, Alison A. "Engineering in brain research : Processing electroencephalograms and chaos in neural networks." Thesis, University of Canterbury. Electrical and Electronic Engineering, 1992. http://hdl.handle.net/10092/6757.

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The structure and function of the brain, as it is presently understood, is outlined. The importance of technology in acquiring this knowledge is illustrated by tracing the history of brain research, and the contributions that engineering is currently making to brain research are discussed. The manifestation of epilepsy in recordings of the electrical activity of the brain – electroencephalograms (EEGs) is outlined. A new PC-based system for the automated detection of this epileptiform activity is presented. The system consists of three stages: data collection, feature extraction and event det

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Zubayer, Anton, and Tai Luong. "Simulation of chaos engineering for Internet-scale software with ns-3." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230214.

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AbstractChaos engineering is the practice of volitionally fault injecting in to a built system with the main purpose of finding the eventual bugs existed in the system before the actual system error occurs. One of the pioneers in this practice is the Simian army, a part of Netflix, where they used random fault injection and linage driven fault injection in its own enormous system with the purposes of suggesting either a relevant approach to chaos engineering or to propose methods of how to uncover the hidden weaknesses. With this paper we seek to attain a simplified illustration about these su

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8

Abu-Mahfouz, Issam Abdullah. "Routes to chaos in rotor dynamics." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060787527.

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9

Nixon, Melina S. "Nonlinear dynamics and chaos of tethered satellite systems." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27246.

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The equations of motion of a tethered satellite system are highly nonlinear and should possess many interesting related features; yet its nonlinear dynamics has never been thoroughly investigated in previous works. This thesis analyzes the nonlinear dynamics of two-body tethered satellite systems using numerical tools of analysis such as phase plane plots, power spectral densities (PSD's), Poincare sections and first Lyapunov exponents, as well as approximate analytical methods including the method of Melnikov. Motion in the stationkeeping phase wherein the tethered system is just a gravity gr

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10

Winters, Victoria R. "Deterministic chaos in Alcator C-Mod edge turbulence." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92696.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 30-31).<br>Understanding the underlying dynamics of turbulence in magnetic confinement fusion experiments is extremely important. Turbulence greatly reduces the confinement time of these devices and therefore greater knowledge of turbulent dynamics can help with its mitigation. Experiments from the Alcator C-Mod tokamak [18] provide support for a theory that edge turbulence in tokamak fusion plasmas is t

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Semler, Christian 1966. "Nonlinear dynamics and chaos of a pipe conveying fluid." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60586.

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This thesis examines the planar dynamics of flexible pipes conveying fluid. The nonlinear equations of motion are derived for cantilevered pipes and for simply-supported pipes, using Hamilton's principle and the force balance method. The resulting equations are compared with previous derivations.<br>The linearized system is first studied, to get the critical parameters corresponding to the stability boundaries, i.e. the local bifurcations. Then, the nonlinear equations are investigated, both analytically and numerically. Centre manifold, normal form and bifurcation theories are used to obtain

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Fay, Sarah (Sarah C. ). "The rotor-oscillator flow : searching for coherence amidst chaos." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98955.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 29).<br>Chaotic mixing of highly viscous fluids is common in many biological and industrial processes. This study aims to gain insight about the properties of such common processes by examining one particular case of viscous, chaotic mixing: the rotor-oscillator flow. For some couplings of the rotor motion with its oscillation, this flow has been shown to have coherent islands of fluid parcels surrounded by a sea

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Abashar, Mohd Elbashir E. "Bifurcation, instability and chaos in fluidized bed catalytic reactors." Thesis, University of Salford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386532.

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Galicia, Felicisimo. "Plasma wave induced chaos in a magnetic field." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38863.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.<br>Includes bibliographical references (leaf 125).<br>by Felicisimo Galicia.<br>B.S.<br>M.Eng.

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Whittle, Lisa. "Stochastic Optimal Trajectory Generation via Multivariate Polynomial Chaos." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65746.

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This thesis presents a framework that has been developed in order to compute stochastic optimal trajectories. This is achieved by transforming the initial set of stochastic ordinary differential equations into their deterministic equivalent by application of Multivariate Polynomial Chaos. Via Galerkin projection, it is possible to include stochastic information in the optimal-trajectory generation process, and to solve the corresponding optimal-control problem using pseudospectral methods. The resultant trajectory is therefore less sensitive to the uncertainties included in the analysis, e.g.,

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Bengtsson, Jonas. "Thriving at the Edge of Chaos." Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik och datavetenskap, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5975.

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In this master thesis two different worldviews are compared: a mechanistic, and an organic worldview. The way we think the world and the nature work reflects on how we think organizations work, or how they ought to work. The mechanistic worldview has dominated our way of thinking since the seventeenth century, and it compares the world with a machine. The organic worldview could use a number of different metaphors, but the one addressed in this thesis is complexity theory. Complexity theory is related to chaos theory and is concerned with complex adaptive systems (cas). Complex adaptive system

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17

Sundersingh, Daniel Y. "Frequency Domain Processing Based Chaos Communication for Cognitive Radio." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1278613042.

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18

Gade, Sandeep. "Design and Implementation of Hybrid Hyperchaotic Sequences for Chaos-Based Communication Systems." Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10638629.

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<p> Chaos-based communication piqued interest of several researchers due to the aperiodic and low cross-correlated waveforms used for modulation at the transmitter. Because of their wideband nature, they were first used as spreading sequences in traditional spread-spectrum communication systems. Later, these techniques were followed by coherent and noncoherent schemes. Noncoherent schemes unlike coherent schemes do not require chaos synchronization. </p><p> Through the years, many methods have been proposed in this category. However, increasing data rates in these schemes posed a challenge.

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19

Johnson, Patrick. "Analysis of 2nd order differential equations : applications to chaos synchronisation and control." Thesis, Northumbria University, 2008. http://nrl.northumbria.ac.uk/1295/.

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In this thesis a number of open problems in the theory of ordinary differential equations (ODEs) and dynamical systems are considered. The intention being to address current problems in the theory of systems control and synchronisation as well as enhance the understanding of the dynamics of those systems treated herein. More specifically, we address three central problems; the determination of exact analytical solutions of (non)linear (in)homogeneous ODEs of order 1 and 2, the determination of upper/lower bounds on solutions of nonlinear ODEs and finally, the synchronisation of dynamical syste

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Deng, Zhi-De. "Stochastic chaos and thermodynamic phase transitions : theory and Bayesian estimation algorithms." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41649.

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Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (p. 177-200).<br>The chaotic behavior of dynamical systems underlies the foundations of statistical mechanics through ergodic theory. This putative connection is made more concrete in Part I of this thesis, where we show how to quantify certain chaotic properties of a system that are of relevance to statistical mechanics and kinetic theory. We consider the motion of a particle trapped in a double-well potential coupled to a noisy e

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Prempraneerach, Pradya 1975. "Uncertainty analysis in a shipboard integrated power system using multi-element polynomial chaos." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40364.

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Thesis (Ph. D. in Ocean Engineering)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Errata, dated Oct. 30, 2007, inserted between pages 3 and 4 of text.<br>Includes bibliographical references (p. 301-307).<br>The integrated power system has become increasingly important in electric ships due to the integrated capability of high-power equipment, for example, electromagnetic rail guns, advance radar system, etc. Several parameters of the shipboard power system are uncertain, caused by a measurement difficulty, a temperature dependency, and random fluctuation of

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Fisher, James Robert. "Stability analysis and control of stochastic dynamic systems using polynomial chaos." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2853.

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Медведєв, В. І. "Контейнеризований python додаток в кластері Kubernetes". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82325.

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Al-saedi, Mohammed Abdullah. "Examination of Acousto-Optic Chaos and Application to RF Signal Encryption and Recovery." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1337808954.

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Alkhateeb, Osama. "DATA-DRIVEN UNCERTAINTY QUANTIFICATION IN APPLICATIONS OF ELECTROMAGNETICS AND WIRELESS COMMUNICATION VIA ARBITRARY POLYNOMIAL CHAOS." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1509988525627307.

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Arzeno, Natalia M. (Natalia María Arzeno Soltero). "Discriminating noise from chaos in heart rate variability : application to prognosis in heart failure." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41252.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (p. 103-109).<br>This thesis examines two challenging problems in chaos analysis: distinguishing deterministic chaos and stochastic (noise-induced) chaos, and applying chaotic heart rate variability (HRV) analysis to the prognosis of mortality in congestive heart failure (CHF). Distinguishing noise from chaos poses a major challenge in nonlinear dynamics theory since the addition of dynamic noise can make a non-chaotic nonlinear system exhi

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Bryden, Michelle D. (Michelle Denise). "Transport in Lagrangian-unsteady flows : dipersion in diverging or converging ducts, and transport rate enhancement accompanying laminar chaos." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/46053.

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Langewisch, Dustin R. "Application of the polynomial chaos expansion to multiphase CFD : a study of rising bubbles and slug flow." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92097.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 157-167).<br>Part I of this thesis considers subcooled nucleate boiling on the microscale, focusing on the analysis of heat transfer near the Three-Phase (solid, liquid, and vapor) contact Line (TPL) region. A detailed derivation of one representative TPL model is presented. From this work, it was ultimately concluded that heat transfer in the vicinity of the TPL is rather unimportant in the overall qu

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Pallavisini, A. "Système d'interférences radiofréquences pour la cryptographie par chaos appliquée aux transmissions hertziennes." Phd thesis, Université de Franche-Comté, 2007. http://tel.archives-ouvertes.fr/tel-00373707.

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La sécurisation des systèmes de transmission de données est un enjeu majeur de la société de l'information. Ce travail aborde une solution potentielle originale, dédiée aux transmissions radio-fréquences en espace libre, et en utilisant un mode de sécurisation à base de comportements chaotiques. La porteuse chaotique est générée par un oscillateur non linéaire à retard, qui permet d'appliquer la méthode de sécurisation par porteuse chaotique en modulation de fréquence directement au niveau de la couche physique du système de transmission. L'étude et la réalisation expérimentale du principe de

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Dagys, Gediminas. "Modemo projektavimas ir tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050525_094223-55883.

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In this paper a modification of the DCSK (Direct chaos shift keying) is considered. This modification, instead of using the reference signal part as in DCSK, transmits the information bit without it. The receiver then uses a unique key, known only to it and the sender, to decode the bit. The effectiveness of the system and two ways of its realization are tried, with this paper describing the experiments that are held. The effectiveness is defined by systems capability to transmit data. The theoretical experiments include testing five different keys and testing noise resistibility. The practica

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Engler, Joseph John. "Characterization of normality of chaotic systems including prediction and detection of anomalies." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/961.

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Accurate prediction and control pervades domains such as engineering, physics, chemistry, and biology. Often, it is discovered that the systems under consideration cannot be well represented by linear, periodic nor random data. It has been shown that these systems exhibit deterministic chaos behavior. Deterministic chaos describes systems which are governed by deterministic rules but whose data appear to be random or quasi-periodic distributions. Deterministically chaotic systems characteristically exhibit sensitive dependence upon initial conditions manifested through rapid divergence of stat

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Blatman, Géraud. "Chaos polynomial creux et adaptatif pour la propagation d'incertitudes et l'analyse de sensibilité." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2009. http://tel.archives-ouvertes.fr/tel-00440197.

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Cette thèse s'insère dans le contexte général de la propagation d'incertitudes et de l'analyse de sensibilité de modèles de simulation numérique, en vue d'applications industrielles. Son objectif est d'effectuer de telles études en minimisant le nombre d'évaluations du modèle, potentiellement coûteuses. Le présent travail repose sur une approximation de la réponse du modèle sur la base du chaos polynomial(CP), qui permet de réaliser des post-traitements à un coût de calcul négligeable. Toutefois, l'ajustement du CP peut nécessiter un nombre conséquent d'appels au modèle si ce dernier dépend d'

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Cheema, Prasad. "Machine Learning for Inverse Structural-Dynamical Problems: From Bayesian Non-Parametrics, to Variational Inference, and Chaos Surrogates." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/24139.

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To ensure that the design of a structure is both robust and eﬃcient, engineers often investigate inverse dynamical modeling problems. In particular, there are three archetypal inverse modeling problems which arise in the context of structural engineering. These are respectively: (i) The eigenvalue assignment problem, (ii) Bayesian model updating, and (iii) Operational modal analysis. It is the intent of this dissertation to investigate all three aforementioned inverse dynamical problems within the broader context of modern machine learning advancements. Firstly, the inverse eigenvalue assi

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Rontani, Damien. "Nonlinear dynamics of photonic components. Chaos cryptography and multiplexing." Phd thesis, Supélec, 2011. http://tel.archives-ouvertes.fr/tel-00783267.

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With the rapid development of optical communications and the increasing amount of data exchanged, it has become utterly important to provide effective architectures to protect sensitive data. The use of chaotic optoelectronic devices has already demonstrated great potential in terms of additional computational security at the physical layer of the optical network. However, the determination of the security level and the lack of a multi-user framework are two hurdles which have prevented their deployment on a large scale. In this thesis, we propose to address these two issues. First, we investi

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Haider, Rizwan. "Modified and Efficient Image Encryption Algorithm Based on Chaos Theory, DNA Complementary Rules and SHA-256." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-29916.

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The emerging topic, symmetric encryption technique for digital imagesusing chaotic function and DNA bases has recently drawn a lot ofattentions from the research community. The use of voice and visualmaterial as an addition to textual data has become more widespread.Multimedia content, the core of which is the digital image, has becomean earth-shaking element in prospective information transmission. Thismeans that multimedia contents such as audio, video and images haveto be transmitted over communication channels securely using newencryption techniques.Chaos theory is a widely studied topic i

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Kundur, Abhinay. "Digital and Analog Signal Encryption and Decryption in Mid RF Range Using Hybrid Acousto-Optic Chaos." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1336100009.

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Abraham, Isaac P. "Logistic Function based Nonlinear Modeling and Circuit Analysis of the Bipolar Vacancy Migration Memristor." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1587033379577733.

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Ilebode, Terry, and Annwesh Mukherjee. "FROM CHAOS TO ORDER: A study on how data-driven development can help improve decision-making." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20070.

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AbstractThe increasing amount of data available from software systems has given a unique opportunity for software development organizations to make use of it in decision-making. There are several types of data such as bug reports, website interaction information, product usage extent or test results coming into software-intensive companies and there is a perceived lack of structure associated with the data. The data is mostly scattered and not in an organized form to be utilized further. The data, if analyzed in an effective way, can be useful for many purposes, especially in decision-making.

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Mohamed, Ali. "Investigation of Anisoplanatic Chaos-based Signal and Image Transmission and Retrieval Through Atmospheric Phase Turbulence." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1583406088398142.

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Mohamed, Fathi Husain Alhadi. "Mitigation of Amplitude and Phase Distortion of Signals Under Modified Von Karman Turbulence Using Encrypted Chaos Waves." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1467943201.

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Luca, Mihai Bogdan. "Apports du chaos et des estimateurs d'états pour la transmission sécurisée de l'information." Phd thesis, Université de Bretagne occidentale - Brest, 2006. http://tel.archives-ouvertes.fr/tel-00488267.

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L'emploi de systèmes chaotiques pour la sécurisation de transmissions numériques est l'objectif principal de cette thèse. L'étude de la synchronisation chaotique a tout d'abord été réalisée par des méthodes d'estimation d'état avec un accent important sur la mise en place d'une nouvelle méthode de filtrage de Kalman polynomiale Exacte. Les performances sont ensuite évaluées, en considérant plusieurs critères (EQM, stabilité, consistence), par rapport à d'autres solutions de filtrage de Kalman (EKF, UKF). Une deuxième partie de l'étude concerne les structures de récepteurs adaptés aux systèmes

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Ruiz, Mora Africa. "Bounded Surfatron Acceleration in the Presence of Random Fluctuations." Master's thesis, Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/345317.

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Mechanical Engineering<br>M.S.M.E.<br>The mechanisms of acceleration and transport of collisionless plasma in the presence of electromagnetic turbulence (EMT) still remains not fully understood. The particle-EMT interaction can be modelled as the interaction of the particle with a particular wave in the presence of random noise. It has been shown that in such a model the acceleration of the charged particles can be almost free. This effect is known as resonance, which can be explained by the so-called “surfatron” mechanism. We have conducted several numerical simulations for the models with an

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Quemard, Céline. "Analyse et optimisation d'une classe de systèmes dynamiques hybrides à commutations autonomes." Phd thesis, Université d'Angers, 2007. http://tel.archives-ouvertes.fr/tel-00464057.

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Les travaux de recherche de ce mémoire porte sur l'étude d'une classe particulière de systèmes dynamiques hybrides (s.d.h.) à commutations autonomes, ces dernières étant engendrées par un phénomène d'hystérésis. Plus particulièrement, après avoir introduit le système mathématique étudié, une analyse de cette classe de s.d.h. est réalisée avec notamment une étude des cycles limites (équations qui les déterminent, stabilité) et des phénomènes de bifurcations (noeud-selle, doublement de période). L'existence de propriétés caractéristiques des systèmes chaotiques comme la sensibilité aux condition

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Karsaklian, dal Bosco Andreas. "Chaos and high-frequency self-pulsations in a laser diode with phase-conjugate feedback." Phd thesis, Supélec, 2013. http://tel.archives-ouvertes.fr/tel-00963630.

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This thesis is a theoretical and experimental study of the dynamics of an edge-emitting laser diode (850 nm) with phase-conjugate feedback. The experimental device is designed to see the dynamical range of the laser through the temporal and spectral properties while the feedback rate varies. Phase-conjugate feedback is performed through four-wave mixing in a photorefractive crystal. The propagation time of the laser beam in the external cavity is termed external time delay. Under the effect of the feedback, the system shows a wide dynamical range including chaos and self-pulsing states which c

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Nechak, Lyes. "Approches robustes du comportement dynamique des systèmes non linéaires : Application aux systèmes frottants." Phd thesis, Université de Haute Alsace - Mulhouse, 2011. http://tel.archives-ouvertes.fr/tel-00708215.

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Cette thèse traite de l'analyse robuste du comportement dynamique des systèmes frottants. Ces derniers constituent une classe particulière des systèmes non linéaires et sont caractérisés par des comportements dynamiques très sensibles aux variations des paramètres de conception en particulier aux dispersions des lois de frottement. Cette sensibilité se traduit par des variations qualitatives importantes du comportement dynamique (stabilité, niveaux vibratoire) qui peuvent alors affecter négativement les performances des systèmes frottants. Il est ainsi important, voire indispensable, de pouvoi

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Andriyas, Tushar. "Particle Dynamics and Resistivity Characteristics in Bifurcated Current Sheets." DigitalCommons@USU, 2013. http://digitalcommons.usu.edu/etd/1513.

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Charged particle chaos and its collective effects in different magnetic geometries are investigated in a sequence of various numerical experiments. The fields generated by the particles as a result of interaction with the background electric and magnetic fields is not accounted for in the simulation. An X-line is first used to describe the geometry of the magnetotail prior to magnetic reconnection and a study of the behavior of charged particles is done from a microscopic viewpoint. Another important geometry in the magnetotail prior to substorm onset is Bifurcated Current Sheet. The same anal

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Yadav, Vaibhav. "Novel Computational Methods for Solving High-Dimensional Random Eigenvalue Problems." Diss., University of Iowa, 2013. https://ir.uiowa.edu/etd/4927.

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The primary objective of this study is to develop new computational methods for solving a general random eigenvalue problem (REP) commonly encountered in modeling and simulation of high-dimensional, complex dynamic systems. Four major research directions, all anchored in polynomial dimensional decomposition (PDD), have been defined to meet the objective. They involve: (1) a rigorous comparison of accuracy, efficiency, and convergence properties of the polynomial chaos expansion (PCE) and PDD methods; (2) development of two novel multi

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Kumeno, Hironori. "Bifurcation et synchronisation dans un système à paramétrisation forcée." Phd thesis, INSA de Toulouse, 2012. http://tel.archives-ouvertes.fr/tel-00749690.

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Dans cette thèse, nous étudions un système à temps discret de dimension N, dont les paramètres varient périodiquement. Le système de dimension N est construit à partir de n sous-systèmes de dimension un couplés symétriquement. Dans un premier temps, nous donnons les propriétés générales du système de dimension N. Dans un second temps, nous étudions le cas particulier où le sous-système de dimension un est défini à l'aide d'une transformation logistique. Nous nous intéressons plus particulièrement à la structure des bifurcations lorsque N=1 ou 2. Des zones échangeurs centrées sur des points cus

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Bryson, Dean Edward. "A Unified, Multifidelity Quasi-Newton Optimization Method with Application to Aero-Structural Design." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1510146591195367.

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Chaparala, Suman Krishna. "Secure Encryption and Decryption by Aperture Variations of a Photodetector in an Acousto-Optic Bragg Cell." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1468527741.

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