Dissertations / Theses on the topic 'Partial synchronization'

Published Article
A reference carrier signal should be regenerated from a received partial response (PR) signal in order to facilitate optimal demodulation of the received signal. This paper describes the development and evaluation of such a carrier recovery system using DSP techniques. The relative phase of a free-running local oscillator at the receiver is synchronized with the carrier signal of a received 49 quadrature partial response signal (49QPRS). Synchronization is achieved and maintained by means of a process of cross-correlation.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
Includes bibliographical references (p. 121-128).
This thesis focuses on the study of collective dynamic behaviors, especially the spontaneous synchronization behavior, of nonlinear networked systems. We derives a body of new results, based on contraction and partial contraction analysis. Contraction is a property regarding the convergence between two arbitrary system trajectories. A nonlinear dynamic system is called contracting if initial conditions or temporary disturbances are forgotten exponentially fast. Partial contraction, introduced in this thesis, is a straightforward but more general application of contraction. It extends contraction analysis to include convergence to behaviors or to specific properties (such as equality of state components, or convergence to a manifold). Contraction and partial contraction provide powerful analysis tools to investigate the stability of large-scale complex systems. For diffusively coupled nonlinear systems, for instance, a general synchronization condition can be derived which connects synchronization rate to net- work structure explicitly. The results are applied to construct flocking or schooling models by extending to coupled networks with switching topology. We further study the networked systems with different kinds of group leaders, one specifying global orientation (power leader), another holding target dynamics (knowledge leader). In a knowledge-based leader-followers network, the followers obtain dynamics information from the leader through adaptive learning. We also study distributed networks with non-negligible time-delays by using simplified wave variables and other contraction-oriented analysis. Conditions for contraction to be preserved regardless of the explicit values of the time-delays are derived.
(cont.) Synchronization behavior is shown to be robust if the protocol is linear. Finally, we study the construction of spike-based neural network models, and the development of simple mechanisms for fast inhibition and de-synchronization.
by Wei Wang.
Ph.D.

Assisted partial timing support is a method to enhance the synchronization of communication networks based on the Precision Timing Protocol. One of the main benefits of the Precision Timing Protocol is that it can utilize a method called holdover through which synchronization in communication networks can be maintained, however, holdover is easily impacted by network load which may cause it to deviate from a microsecond accuracy that is required. In this project, neural networks are investigated as an aid to assisted partial timing support with the intention to combat the effects of network load. This hypothesis is to achieve this through a neural network being able to predict the offset due to time delay in the communication networks and thus being able to cancel out this effect from previous offset. Feed-forward and recurrent neural networks are tested on four different types of load patterns that commonly occur on communication networks. The results show that although some level of prediction is possible, the accuracy with which the tested neural networks provide prediction is not high enough to allow it to be used for compensation of the offset caused by the load. This with the best result reaching a mean squared error of ten microseconds squared and the requirement looked for was for where the maximum was one microsecond. This project only looked at short periods of the load patterns and future areas to investigate could be looking at longer periods of the load patterns.

Orthostatic intolerance (OI), i.e., the inability to maintain stable arterial pressure during upright posture, is a major problem for astronauts after spaceflight. Therefore, one important goal of spaceflight-related research is the development of countermeasures to prevent post flight OI. Given the rarity and expense of spaceflight, countermeasure development requires ground-based simulations of partial gravity to induce appropriate orthostatic effects on the human body, and to test the efficacy of potential countermeasures. To test the efficacy of upright lower body positive pressure (LBPP) as a model for simulating cardiovascular responses to lunar and Martian gravities on Earth, cardiovascular responses to upright LBPP were compared with those of head-up tilt (HUT), a well-accepted simulation of partial gravity, in both ambulatory and cardiovascularly deconditioned subjects. Results indicate that upright LBPP and HUT induced similar changes in cardiovascular regulation, supporting the use of upright LBPP as a potential model for simulating cardiovascular responses to standing and moving in lunar and Martian gravities. To test the efficacy of a short exposure to artificial gravity (AG) as a countermeasure to spaceflight-induced OI, orthostatic tolerance limits (OTL) and cardiovascular responses to orthostatic stress were tested in cardiovascularly deconditioned subjects, using combined 70º head-up tilt and progressively increased lower body negative pressure, once following 90 minutes AG exposure and once following 90 minutes of -6º head-down bed rest (HDBR). Results indicate that a short AG exposure increased OTL of cardiovascularly deconditioned subjects, with increased baroreflex and sympathetic responsiveness, compared to those measured after HDBR exposure. To gain more insight into mechanisms of causal connectivity in cardiovascular and cardiorespiratory oscillations during orthostatic challenge in both ambulatory and cardiovascularly deconditioned subjects, couplings among R-R intervals (RRI), systolic blood pressure (SBP) and respiratory oscillations in response to graded HUT and dehydration were studied using a phase synchronization approach. Results indicate that increasing orthostatic stress disassociated interactions among RRI, SBP and respiration, and that dehydration exacerbated the disconnection. The loss of causality from SBP to RRI following dehydration suggests that dehydration also reduced involvement of baroreflex regulation, which may contribute to the increased occurrence of OI.

De nombreux systèmes de transport peuvent être modélisées par des synchronisations ordinaires (pour tout k>=l, l'occurrence k de l'événement B se produit au moins t unités de temps après l'occurrence k-l de l'événement A). Ces systèmes sont linéaires dans l'algèbre (max,+). Pour certaines applications, il est primordial de modéliser la simultanéité entre événements. Comme la synchronisation ordinaire ne suffit pas à exprimer ce phénomène, nous introduisons la synchronisation partielle (l'événement B ne peut se produire que quand l'événement A se produit). Dans ce mémoire, des méthodes développées pour la modélisation et le contrôle de systèmes linéaires dans l'algèbre (max,+) sont étendues à des systèmes régis par des synchronisations ordinaires et partielles. Nous considérons uniquement des systèmes divisés en un système principal et un système secondaire et gouvernés par des synchronisations ordinaires entre événements dans le même système et des synchronisations partielles d'événements dans le système secondaire par des événements dans le système principal. Nous introduisons une commande optimale et une commande prédictive pour cette classe de systèmes par analogie avec les résultats disponibles pour les systèmes linéaires dans l'algèbre (max,+). En considérant un comportement donné pour le système principal, il est aussi possible de représenter le système secondaire par une fonction de transfert et de modifier sa dynamique pour suivre un modèle de référence
Many transportation networks can be modeled by (max,+)-linear systems, i.e., discrete event systems ruled by standard synchronizations (conditions of the form: "for all k>=l, occurrence k of event B is at least t units of time after occurrence k-l of event A"). In some applications, it is also necessary to model simultaneity between events (e.g., for a road equipped with traffic lights, a vehicle can cross an intersection only when the associated traffic light is green). Such conditions cannot be expressed using standard synchronizations. Hence, we introduce the partial synchronization (condition of the form: "event B can only occur when event A occurs"). In this thesis, we consider a class of discrete event systems ruled by standard and partial synchronizations, called (max,+)-systems with partial synchronization. Such systems are split into a main system and a secondary system such that there exist only standard synchronizations between events in the same system and partial synchronizations of events in the secondary system by events in the main system. We adapt some modeling and control approaches developed for (max,+)-linear systems to (max,+)-systems with partial synchronization. Optimal feedforward control and model predictive control for (max,+)-linear systems are extended to (max,+)-systems with partial synchronization. Furthermore, transfer relation and model reference control are provided for the secondary system under a predefined behavior of the main system

Dissertação de Mestrado Integrado em Medicina Veterinária
Para uma empresa agrícola é importante avaliar o impacto económico de uma nova tecnologia antes de ser implementada, nomeadamente a sincronização de partos. Neste contexto foi avaliado o custo-benefício de um protocolo de sincronização utilizando 0,175 mg cloprostenol e 40 UI de oxitocina por animal, tendo sido adotados como parâmetros de avaliação de eficiência reprodutiva a proporção de partos que decorreram durante o horário laboral, o peso dos leitões ao nascimento, o número de nados vivos, o número de nados mortos, a mortalidade acumulada às 48h, o número de leitões desmamados e o peso dos leitões ao desmame. A amostra foi constituida por 100 porcas F1, com mais de um parto, divididas em dois grupos. No grupo de tratamento o parto foi induzido, enquanto que no grupo controlo a parição foi espontânea. Dos parâmetros em estudo, o único que resultou numa diferença estatisticamente significativa entre os grupos em estudo foi o peso ao nascimento. A média do peso do grupo de controlo foi de 1252,96 +/- 330,04g, enquanto que a média do peso no grupo de tratamento foi de 1227,90 +/- 378,58g. A proporção de partos que ocorreram durante o horário laboral no grupo de tratamento foi de 81%, enquanto que o no grupo de tratamento 35% dos partos ocorreram durante o horário laboral. Utilizou-se a metodologia dos orçamentos parciais de substituição para analisar a viabilidade económica da sincronização de partos em porcas face a uma situação de partos não induzidos. Esta sincronização tem viabilidade económica (2. 545,4 EUR/ano para a exploração) se após indução, os partos ocorrerem em apenas um dia, mas não terá viabilidade se estes ocorrerem num período de dois dias (-58,8 EUR/ano para a exploração).
ABSTRACT - For an agricultural business, it is important to evaluate the economic impact of a new technology before its implementation, namely parturition synchronization. In this context, it was evaluated the benefit of a synchronization protocol using 0,175 mg of cloprostenol and 40 UI of oxytocin per animal, having as efficiency parameters the percentage of births occurring during work hours, piglet birth weight, number of stillbirths, number of born alive, cumulative mortality at 48h, number of weaned piglets and their weight. The sample was composed of 100 F1 sows, all with more than one parturition, and wasdivided into two groups: the treatment group, where birth was induced, and a control group where the sows were left to birth spontaneously. The only parameter in the study that resulted in a significantly statistical difference was the piglet birth weight, where the control group weight 1252,96 +/- 330,04g, and the treatment group 1227,90 +/- 378,58g. The percentage of births occurring during work hours in the treatment group was 81% whereas in the control group that percentage was 35%. Partial budgeting analysis was used to assess the economic benefit of a parturition synchronization protocol in sows. If delivers occurs in two days after induction, the net result is expected to be -58,8 EUR/year for the farm whereas if delivers occurs in only one day after induction, the net result is expected to be 2. 545,4 EUR/year for the farm.
info:eu-repo/semantics/publishedVersion

Le fonctionnement d'un neurone, unité fondamentale du système nerveux, intéresse de nombreuses disciplines scientifiques. Il existe ainsi des modèles mathématiques qui décrivent leur comportement par des systèmes d'EDO ou d'EDP. Plusieurs de ces modèles peuvent ensuite être couplés afin de pouvoir étudier le comportement de réseaux, systèmes complexes au sein desquels émergent des propriétés. Ce travail présente, dans un premier temps, les principaux mécanismes régissant ce fonctionnement pour en comprendre la modélisation. Plusieurs modèles sont alors présentés, jusqu'à celui de FitzHugh-Nagumo (FHN), qui présente une dynamique très intéressante.C'est sur l'étude théorique mais également numérique de la dynamique asymptotique et transitoire du modèle de FHN en EDO, que se concentre la seconde partie de cette thèse. A partir de cette étude, des réseaux d'interactions d'EDO sont construits en couplant les systèmes dynamiques précédemment étudiés. L'étude du phénomène de synchronisation identique au sein de ces réseaux montre l'existence de propriétés émergentes pouvant être caractérisées par exemple par des lois de puissance. Dans une troisième partie, on se concentre sur l'étude du système de FHN dans sa version EDP. Comme la partie précédente, des réseaux d'interactions d'EDP sont étudiés. On entreprend dans cette partie une étude théorique et numérique. Dans la partie théorique, on montre l'existence de l'attracteur global dans l'espace L2(Ω)nd et on donne des conditions suffisantes de synchronisation. Dans la partie numérique, on illustre le phénomène de synchronisation ainsi que l'émergence de lois générales telles que les lois puissances ou encore la formation de patterns, et on étudie l'effet de l'ajout de la dimension spatiale sur la synchronisation
The neuron, a fundamental unit in the nervous system, is a point of interest in many scientific disciplines. Thus, there are some mathematical models that describe their behavior by ODE or PDE systems. Many of these models can then be coupled in order to study the behavior of networks, complex systems in which the properties emerge. Firstly, this work presents the main mechanisms governing the neuron behaviour in order to understand the different models. Several models are then presented, including the FitzHugh-Nagumo one, which has a interesting dynamic. The theoretical and numerical study of the asymptotic and transitory dynamics of the aforementioned model is then proposed in the second part of this thesis. From this study, the interaction networks of ODE are built by coupling previously dynamic systems. The study of identical synchronization phenomenon in these networks shows the existence of emergent properties that can be characterized by power laws. In the third part, we focus on the study of the PDE system of FHN. As the previous part, the interaction networks of PDE are studied. We have in this section a theoretical and numerical study. In the theoretical part, we show the existence of the global attractor on the space L2(Ω)nd and give the sufficient conditions for identical synchronization. In the numerical part, we illustrate the synchronization phenomenon, also the general laws of emergence such as the power laws or the patterns formation. The diffusion effect on the synchronization is studied

In this Ph.D. thesis, a new methodology for the fault tolerant system state synchronization design and its recovery from faults is presented. A state synchronization method designed by means of the proposed methodology allows to repair the state of sequential logic elements implemented in the FPGA application logic, which cannot be repaired by the partial dynamic reconfiguration. The proposed methodology describes possible state synchronization design methods with respect to TMR granularity, dependence of the system function on its previous states and the system architecture. The methodology focuses on coarse-grained TMR architectures and state synchronization in the systems controlled by means of finite state machines or a processor. The use of the methodology is demonstrated on the CAN bus control system and the microcontroller NEO430, for which specific synchronization methods were designed. The systems reliability and new ability of the systems for recovery from faults were verified in the presence of simulated SEU faults. The experimental results and the contribution of this thesis are discussed in the conclusion.

In Particle Accelerators, the Low-Level RF (LLRF) is the control system of the RF, and in the end, of the purpose of the machine, that is the energy transfer and acceleration of particles. It implements algorithms synchronizing the RF conveying the energy to the beam and tailoring its longitudinal parameters. For this, the LLRF uses beam-related signals whose spectral content changes during the acceleration. The increase in energy results in an increase of the beam velocity, and for circular accelerators (Synchrotrons) a decrease in revolution period. This is especially relevant for Hadron machines whose injection energy is low resulting in a significant increase of their velocity before reaching relativistic speeds. Hence, the LLRF needs to continuously tune its processing to the beam; we call this technique Beam Synchronous Processing. One important task of the LLRF is the compensation of the beam-induced voltage in the accelerating cavities (Beam Loading). In the CERN SPS the regulation bandwidth must cover 5 MHz on each side of the 200 MHz RF. With a beam revolution period around 23 µs more than a hundred revolution frequency harmonics, present in the beam signal, fall in the RF sidebands. The variation in beam velocity changes the position and spacing of the harmonics in the spectrum. The large number of harmonics and their varying positions make the algorithm reconfiguration an undesirable option. To cope with this, the early digital implementations used a system clock derived from the sweeping RF. This locks the sampling and the processing to the beam, by design. This historical solution, that is still in use in several machines, is now a limiting factor for the use of modern technologies. The Thesis presents a novel Beam Synchronous Processing Architecture, using a fixed frequency clocking, and capable of treating periodic signals with known and varying fundamental frequency. The Architecture is an alternative to the burden of reconfiguration in processing algorithms; it tunes the spectrum to the processing by resampling the input data. Two Resamplers are combined in the so-called resampling sandwich. The application algorithm requiring synchronism with the input signal is placed in the middle. The key element is a novel All-Digital Farrow-based Resampler, that accepts arbitrary resampling ratios that can be modified in real-time. The hardware uses a single fixed frequency system clock, making its implementation feasible in State-Of-the-Art FPGAs, ASICs and systems such as the new uTCA platform currently being deployed in the CERN SPS LLRF system. The input and output ports of the Resampler, and all the processing within the Architecture, are synchronous to this fixed frequency clock and accept data streams whose sampling rate can be variable and modified in real time. The Architecture has been commissioned in a LLRF uTCA crate hosting the One Turn FeedBack algorithm to control a real SPS cavity. The algorithm compensates the Beam Loading. The Architecture has demonstrated its capability to track in real-time an energy ramp with an RF frequency following a linear sawtooth pattern ramped at 2.4 MHz per second. The complete uTCA implementation has successfully passed all the functional validation and qualitative tests. The Architecture suits seamless the two technological paradigm changes adopted for the new CERN SPS LLRF system; first, the instantaneous value of the RF frequency is transmitted as a numerical word (used to set the resampling ratio), via a deterministic network, the White Rabbit. And second, the reference signal is now the fixed frequency clock recovered from this network. Both paradigms benefit from the all-digital Resampler and the Beam Synchronous Architecture that fulfil the techniques and technological needs for its implementation enabling novel LLRF algorithms and solutions.
En un Acelerador de Partículas, el Low Level RF (LLRF) es el sistema de control de la RF, e implícitamente, de la transferencia de energía y aceleración de partículas, objetivo último de la máquina. El LLRF implementa algoritmos que sincronizan la transferencia de energía de RF hacia el haz, y controla sus parámetros longitudinales. Usa señales del haz, cuyo contenido espectral se modifica con la aceleración. El incremento en energía implica un incremento en velocidad del haz que, para aceleradores circulares (Sincrotrones), resulta en un decremento del periodo de revolución. Esto es relevante en aceleradores de Hadrones, en los cuales la baja energía de inyección favorece grandes incrementos de velocidad antes de alcanzar valores relativistas. El LLRF necesita por tanto sintonizar continuamente el procesado y el haz (Beam Synchronous Processing). Una misión del LLRF es la compensación de la tensión inducida por el haz en cavidades aceleradoras (Beam Loading). En el sincrotrón SPS del CERN, el ancho de banda de regulación cubre 5 MHz a cada lado de la RF (200 MHz). Con un periodo de revolución de aproximadamente 23 µs, más de cien harmónicos de la frecuencia de revolución, presentes en la señal del haz, aparecen en las bandas alrededor de la RF. La variación en velocidad del haz cambia la posición y espaciado de estos harmónicos en el espectro. Su número y posición cambiante hacen una opción poco deseable la reconfiguración en algoritmos de control. La solución histórica es un reloj de sistema derivado de la RF, por tanto variable, que liga por diseño el muestreo y procesado al haz. Aún en uso en varias máquinas, este reloj es ahora un factor limitante para el uso de nuevas tecnologías. Esta Tesis presenta una nueva Arquitectura para Tratamiento Síncrono de Señales derivadas del Haz, mediante un reloj de sistema con frecuencia fija, que posibilita el tratamiento de señales periódicas en las que el harmónico fundamental tiene una frecuencia variable y conocida. La Arquitectura es una alternativa válida al problema de reconfiguración de algoritmos de procesado; sintoniza el espectro al procesado mediante el re-muestreo de los datos. Dos Re-muestreadores (Resamplers) son combinados en el denominada sándwich de re-muestreo. El algoritmo requiriendo sincronismo con el haz, se sitúa en medio de este sándwich. El elemento clave es un novedoso Resampler digital que acepta relaciones de re-muestreo arbitrarias y modificables en tiempo real. El hardware usa un único reloj de sistema de frecuencia fija, facilitando la implementación en FPGAs, ASICs y sistemas de última generación, como los controladores uTCA en los sistemas LLRF del SPS en el CERN. Los puertos de entrada y salida del Resampler, y todo el procesado en la Arquitectura, son síncronos a este reloj, y aceptan señales con una frecuencia de muestreo variable en tiempo real.La Arquitectura ha sido implementada en un controlador uTCA de una cavidad del SPS albergando el algoritmo One Turn FeedBack. El algoritmo compensa el Beam Loading. La Arquitectura demuestra ser viable operando sintonizada a una rampa de aceleración del haz, con una RF cuya frecuencia varia linealmente a 2.4 MHz por segundo siguiendo un patrón en diente de sierra. La implementación de la Arquitectura ha pasado toda la validación funcional y test cualitativos. La Arquitectura se adapta de manera sin igual a dos cambios de paradigma tecnológico adoptados por el LLRF del SPS; primero, la distribución del valor instantáneo de la frecuencia de RF es ahora hecho mediante una palabra digital con una red determinista, White Rabbit. Y segundo, la señal de referencia es ahora un reloj con frecuencia fija extraído de esta red. La adopción de ambos paradigmas se ve beneficiada por el uso de la Arquitectura y Resampler, que satisfacen los requerimientos técnicos y tecnológicos para la implementación de nuevos algoritmos y soluciones LLRF.
Dans le monde des Accélérateurs de Particules, le Low-Level RF (LLRF) est le système de contrôle de la RF et, in-fine, du transfert d'énergie et de l'accélération des particules. Il met en oeuvre des algorithmes synchronisant la RF transférant l'énergie au faisceau et adaptant ses paramètres longitudinaux. Pour cela, le LLRF utilise des signaux liés au faisceau dont le contenu spectral est modifié par l'accélération. L'augmentation d'énergie se traduit par une augmentation de la vitesse du faisceau, et pour les accélérateurs circulaires (Synchrotrons), une diminution de la période de révolution. Cela est particulièrement pertinent pour les machines à Hadrons dont l’énergie d’injection est faible, avec la conséquence d’une augmentation significative de leur vitesse durant l’accélération. Le LLRF doit donc ajuster en permanence son traitement au faisceau ; nous appelons cette exigence Beam Synchronous Processing. Une tâche importante du LLRF est la compensation de la tension induite par le faisceau (Beam Loading). Dans le SPS au CERN, la régulation couvre 5 MHz de chaque côté de la RF (200 MHz). Avec une période de révolution autour de 23 μs, plus d'une centaine d’harmoniques de fréquence de révolution, présentes dans le spectre du faisceau, tombent dans la bande +- 5 MHz. La variation de vitesse du faisceau modifie la position et l'espacement des harmoniques dans le spectre. Le grand nombre de raies spectrales et leur position variable font de la reconfiguration de l'algorithme une option indésirable. Les solutions digitales existantes ont donc préféré changer l’horloge d’échantillonnage : Celle-ci est verrouillée sur la RF, ce qui synchronise par conception l'échantillonnage et le traitement du faisceau. Cette solution historique, toujours en usage dans plusieurs machines, est aujourd'hui un facteur limitant pour les technologies modernes. La Thèse présente une nouvelle Architecture de traitement synchrone de faisceau, utilisant une horloge fixe, et capable de traiter des signaux périodiques de fréquence fondamentale connue et possiblement variable. L'Architecture apporte une alternative au fardeau de la reconfiguration dans les algorithmes ; il ajuste le spectre au traitement en rééchantillonnant les données d'entrée. Deux Rééchantillonneurs ont été combinés dans le sandwich de rééchantillonnage. L'algorithme d'application nécessitant un synchronisme avec le signal d'entrée est placé au milieu. L'élément clé est un nouveau Ré-échantillonneur entièrement numérique basé sur une architecture Farrow, qui accepte des taux de rééchantillonnage arbitraires pouvant également être modifiés en temps réel. L’implémentation utilise une seule horloge système à fréquence fixe, ce qui rend sa mise en œuvre possible dans les FPGA, ASIC et systèmes de pointe comme la nouvelle plate-forme uTCA actuellement déployée dans le SPS du CERN. L’entrée et la sortie du Ré-échantillonneur, et tout le traitement dans l'Architecture, sont synchrones avec cette horloge et acceptent un taux d’échantillonnage variable que peut être modifiée en temps réel. L'Architecture a été déployée dans un châssis uTCA hébergeant l'algorithme One Turn FeedBack pour contrôler une véritable cavité SPS. L'algorithme compense le Beam Loading. L'Architecture a démontré sa capacité à suivre en temps réel une rampe d'énergie avec une fréquence RF suivant une modulation en dent de scie, à 2.4 MHz par seconde. L’implémentation complète sur uTCA a passé avec succès les tests de validation fonctionnelle et qualitative. L'Architecture convient parfaitement aux deux paradigmes technologiques adoptés pour le nouveau système LLRF du SPS ; premièrement, la valeur instantanée de la fréquence RF est transmise sous forme de mot numérique (qui donnera le taux de rééchantillonnage), via un réseau déterministe, le White Rabbit. Et deuxièmement, le signal de référence est maintenant l'horloge à fréquence fixe récupérée de ce réseau. La solution présentée respecte ces deux paradigmes grâce au Réchantillonneur entièrement numérique et à l'horloge fixe.
Ciència i enginyeria de materials

Cette thèse est consacrée à l'étude de la dynamique des systèmes complexes. Nous construisons des réseaux couplés à partir de multiples instances de systèmes dynamiques déterministes, donnés par des équations différentielles ordinaires ou des équations aux dérivées partielles de type parabolique, qui décrivent un problème d'évolution. Nous étudions le lien entre la dynamique interne à chaque nœud du réseau, les éléments de la topologie du graphe portant ce réseau, et sa dynamique globale. Nous recherchons les conditions de couplage qui favorisent une dynamique globale particulière à l'échelle du réseau, et étudions l'impact des interactions sur les bifurcations identifiées sur chaque nœud. Nous considérons en particulier des réseaux couplés de systèmes de réaction-diffusion, dont nous étudions le comportement asymptotique, en recherchant des régions positivement invariantes, et en démontrant l'existence d'attracteurs exponentiels de dimension fractale finie, à partir d'estimations d'énergie qui révèlent la nature dissipative de ces réseaux de systèmes de réaction-diffusion. Ces questions sont étudiées dans le cadre de quelques applications. En particulier, nous considérons un modèle mathématique pour l'étude géographique des réactions comportementales d'individus, au sein d'une population en situation de catastrophe. Nous présentons les éléments de modélisation associés, ainsi que son étude mathématique, avec une analyse de la stabilité des équilibres et de leurs bifurcations. Nous établissons l'importance capitale des chemins d'évacuation dans les réseaux complexes construits à partir de ce modèle, pour atteindre l'équilibre attendu de retour au comportement du quotidien pour l'ensemble de la population considérée, tout en évitant une propagation du comportement de panique. D'autre part, la recherche de solutions périodiques émergentes dans les réseaux d'oscillateurs nous amène à considérer des réseaux complexes de systèmes hamiltoniens pour lesquels nous construisons des perturbations polynomiales qui provoquent l'apparition de cycles limites, problématique liée au XVIème problème de Hilbert
This thesis is devoted to the study of the dynamics of complex systems. We consider coupled networks built with multiple instances of deterministicdynamical systems, defined by ordinary differential equations or partial differential equations of parabolic type, which describe an evolution problem.We study the link between the internal dynamics of each node in the network, its topology, and its global dynamics. We analyze the coupling conditions which favor a particular dynamics at the network's scale, and study the impact of the interactions on the bifurcations identified on each node. In particular, we consider coupled networks of reaction-diffusion systems; we analyze their asymptotic behavior by searching positively invariant regions, and proving the existence of exponential attractors of finite fractal dimension, derived from energy estimates which suggest the dissipative nature of those networks of reaction-diffusion systems.Our framework includes the study of multiple applications. Among them, we consider a mathematical model for the geographical analysis of behavioral reactions of individuals facing a catastrophic event. We present the modeling choices that led to the study of this evolution problem, and its mathematical study, with a stability and bifurcation analysis of the equilibria. We highlight the decisive role of evacuation paths in coupled networks built from this model, in order to reach the expected equilibrium corresponding to a global return of all individuals to the daily behavior, avoiding a propagation of panic. Furthermore, the research of emergent periodic solutions in complex networks of oscillators brings us to consider coupled networks of hamiltonian systems, for which we construct polynomial perturbationswhich provoke the emergence of limit cycles, question which is related to the sixteenth Hilbert's problem

ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada
Multi-H Continuous Phase Modulation is a highly bandwidth efficient constant amplitude modulation scheme. Because of these qualities it was selected as the Advanced Range Telemetry (ARTM) tier II waveform. In the past, two demodulation techniques have widely been proposed, coherent detection and non-coherent detection. This paper presents a receiver design that implements a hybrid, partially coherent detection scheme that takes advantage of the positive aspects of both coherent and non-coherent detection. Because complete phase recovery is not required, the hybrid receiver performs better in environments with fast fading, strong phase noise, and multi path when compared to the traditional coherent receiver. The hybrid receiver can also acquire and reacquire signals much faster than conventional coherent receivers. The hybrid receiver design implements a partial carrier detection scheme that utilizes phase information that performs much better in AWGN environments than typical non-coherent receivers. Simulation results show that the hybrid receiver has low implementation loss compared to the optimal Maximum Likelihood Sequence Estimation (MLSE) receiver.

La presente tesis doctoral, se centra en el desarrollo de métodos matemáticos para el estudio de procesos estocásticos de interés en física y otras ciencias naturales. Fundamentalmente se consideran sistemas de particulas en interacción, prestando especial atención al efecto de la heterogeneidad entre los componentes del sistema, así como el retraso en las interacciones. También se estudian propiedades de sincronización en sistemas de elemenentos excitables no identicos. Se desarrollan diversos métodos analíticos para estudiar este tipo de sistemas y se derivan diversos resultados mátematicos, algunos exactos y otros aproximados, relevantes para el entendimiento general de este tipo de sitemas. Los métodos desarrollados son aplicados al estudio de diversos sistemas concretos, de interés en expresión genética, epidemiología o economía.

Cette thèse présente la réalisation d’un piège optique dans une configuration originale, le piston optique, où le contrôle sur la phase de l’interférence d’un faisceau incident avec sa réflexion sur un miroir permet de réaliser différents types d’expériences. Nous avons d’abord étudié les propriétés thermodynamiques d’une compression progressive du piston qui fait passer la dynamique de la particule piégée d’une région de stabilité vers une région de bistabilité mécanique. Dans le contexte de la résonance stochastique où une force extérieure périodique est appliquée sur cette dynamique bistable, une approche exploitant le facteur de Mandel ainsi qu’une analyse des délais entre les transitions d’états métastables se révèle efficace pour interpréter nos mesures dans différents régimes de forçage. Nous montrons également comment des nanoparticules métalliques peuvent être piégées aisément dans un tel piston optique et nous exploitons notre configuration pour mesurer de faibles effets de forces optiques. Enfin, nous piégeons des nano-objets chiraux uniques et nous montrons comment la configuration de notre piston permet de réaliser des expériences de reconnaissance chirale par polarimétrie différentielle
This thesis describes the experimental realization of an original optical trap, the optical piston, where controlling the phase of the interference of an incident beam with its reflection on a mirror allows achieving various experiments. We have first looked into the thermodynamics associated with a progressive compression of the piston leading the dynamics of a trapped particle from a region of stability to a region of mechanical bistability. In the context of stochastic resonance where a periodic external force is applied on this bistable dynamics, an approach exploiting the Mandel factor and a time-delay analysis on the hopping events between metastable states have proven efficient in interpreting the different results acquired in different regimes of drive. We have also shown how metallic nanoparticles can be trapped fairly easily in this kind of optical piston and we exploit our configuration to measure weak optical forces. Finally, we trap unique chiral nano-objects and we show how the configuration of our piston allows the realization of chiral recognition experiments by differential polarimetry

A dinâmica de sistemas caóticos é uma área de pesquisa relativamente recente, diretamente relacionada com os campos da engenharia, física e matemática aplicada. A sincronização entre sistemas dinâmicos tem sido um tópico de pesquisa muito freqüente, abrangendo campos desde a mecânica de corpos celestiais até a física dos lasers. Entretanto, a maioria dos trabalhos da área concentra-se em simulações numéricas do comportamento de sistemas caóticos. Com o objetivo de verificar aplicações em engenharia do sincronismo entre circuitos, foi proposto o circuito eletrônico partícula em caixa, que é relativamente simples, se comparado com outros trabalhos na literatura. A originalidade deste trabalho consiste em verificar a robustez de alguns sistemas compostos de circuitos idênticos que simulam o comportamento de uma partícula em caixa em configurações mestre-escravo, em diversas topologias, explorando o sincronismo dos mesmos utilizando uma malha fechada de realimentação de erro. A robustez do acoplamento destes sistemas é estudada por meio de montagens experimentais e simulações numéricas. A observação da sua dinâmica permite sugerir aplicações na área de telecomunicações em multiplexação de sinais, acesso multiusuário e tecnologia CDMA (Code Division Multiple Access)
The dynamics of chaotic systems is a relatively new research area, directly related to the fields of engineering, physics and applied mathematics. Synchronization between dynamic systems has been a very frequent topic of research, covering fields ranging from mechanics of celestial bodies to the physics of lasers. However, most of the work area focuses on numerical simulations of the behavior of chaotic systems. In order to verify engineering applications of synchronism of circuits, it was proposed a particle in a box electronic circuit, which is relatively simple if compared to other studies. The originality of this work is to verify the robustness of some systems composed of identical circuits that simulate the behavior of a particle in a box in master-slave configurations in several topologies, exploring their synchronism using a closed loop feedback error. The strength of the coupling of these systems is studied through numerical simulations and experimental setups. The observation of this dynamics allows us to suggest applications in telecommunications in signal multiplexing, multiuser access and CDMA (Code Division Multiple Access)

La recherche s’attache à améliorer la compréhension d’un management stratégique des coopérations entre les parties prenantes d’un projet de construction. Cette thèse développe tout particulièrement le lien entre ce management des coopérations et la performance socio-économique des organisations de maîtrise d’œuvre. Ce lien est analysé à partir des deux principaux cadres théoriques que sont la théorie socio-économique et la théorie des parties prenantes. L’état des lieux du management stratégique des coopérations au sein des organisations de maîtrise d’œuvre, réalisé selon une approche dysfonctionnelle conforme à la méthodologie de recherche-intervention socio-économique, met en évidence les principales causes des défaillances de coopération et leurs impacts sur les parties prenantes. Puis, les expérimentations, menées dans 22 agences d’architecture et une PME de maîtrise d’œuvre, montrent que la synchronisation, le pilotage stratégique et le pilotage des compétences des parties prenantes constituent les trois principaux axes d’amélioration de ce management stratégique des coopérations. Des leviers et facteurs de développement de ces axes, mobilisables par les organisations de maîtrise d’œuvre pour améliorer la qualité des coopérations avec leurs parties prenantes internes et externes, sont développés. Les compétences et la confiance se révèlent deux facteurs significatifs de performance et de durabilité des coopérations. Leur articulation conduit au développement d’un concept de coopération-confiance performante et durable où le management stratégique des coopérations constitue l’activateur qui, par effet de levier, améliore la performance socio-économique de l’organisation ainsi que son pilotage. Un pilotage qui invite à un repositionnement de la fonction de maître d’œuvre vers celle de maître d’œuvre-pilote des coopérations
This dissertation aims to enhance understanding of strategic management cooperation between the stakeholders of a construction project. Our work is particularly focused on the link between cooperation management and socio-economic performance of architectural and engineering firms. This link is analyzed through two main theoretical frameworks: socio-economic theory and stakeholder theory. An empirical analysis of strategic management cooperation within architectural and engineering organizations, through a dysfunctional approach according to the socio-economic intervention-research methodology, highlights the main causes of cooperation failures and their impacts on stakeholders. Then, experimentations, conducted in 22 architectural firms and in a SME engineering company, show that synchronization, strategic management and stakeholders’ skills management are three main improvement axes of cooperation strategic management. Those axes’ levers and development factors, mobilized by architectural and engineering firms to improve cooperation quality with internal and external stakeholders, are developed. Skills and trust appear as two significant cooperation performance and sustainability factors. Their combination leads to the development of a concept of efficient and sustainable cooperation-trust management in which strategic cooperation is the activator, by leverage effect, improves the organization’s socio-economic performance and its management. A management which calls for repositioning the architectural and engineering firms work to that of architectural and engineering firms as cooperation managers

Nas últimas décadas, testemunhou-se um crescente interesse no estudo de sistemas complexos. Tais sistemas são compostos por pelo menos dois componentes fundamentais: elementos dinâmicos individuais e uma estrutura de organização definindo a forma de interação entre estes. Devido a dinâmica de cada elemento e a complexidade de acoplamento, uma grande variedade de fenômenos espaço-temporais podem ser observados. Esta tese tem como objetivo principal explorar o uso da dinâmica espaço-temporal em redes visando a solução de alguns problemas computacionais. Com relação aos mecanismos dinâmicos, a sincronização entre osciladores acoplados, a caminhada aleatória-determinística e a competição entre elementos na rede foram considerados. Referente à parte estrutural da rede, tanto estruturas regulares baseadas em reticulados quanto redes com estruturas mais gerais, denominadas redes complexas, foram abordadas. Este estudo é concretizado com o desenvolvimento de modelos aplicados a dois domínios específicos. O primeiro refere-se à utilização de redes de osciladores acoplados para construção de modelos de atenção visual. Dentre as principais características desses modelos estão: a seleção baseada em objetos, a utilização da sincronização/ dessincronização entre osciladores neurais como forma de organização perceptual, a competição entre objetos para aquisição da atenção. Além disso, ao comparar com outros modelos de seleção de objetos baseados em redes osciladores, um número maior de atributos visuais é utilizado para definir a saliência dos objetos. O segundo domínio está relacionado ao desenvolvimento de modelos para detecção de comunidades em redes complexas. Os dois modelos desenvolvidos, um baseado em competição de partículas e outro baseado em sincronização de osciladores, apresentam alta precisão de detecção e ao mesmo tempo uma baixa complexidade computacional. Além disso, o modelo baseado em competição de partículas não só oferece uma nova técnica de detecção de comunidades, mas também apresenta uma abordagem alternativa para realização de aprendizado competitivo. Os estudos realizados nesta tese mostram que a abordagem unificada de dinâmica e estrutura é uma ferramenta promissora para resolver diversos problemas computacionais
In the last decades, an increasing interest in complex system study has been witnessed. Such systems have at least two integrated fundamental components: individual dynamical elements and an organizational structure which defines the form of interaction among those elements. Due to the dynamics of each element and the coupling complexity, various spatial-temporal phenomena can be observed. The main objective of this thesis is to explore spatial-temporal dynamics in networks for solving some computational problems. Regarding the dynamical mechanisms, the synchronization among coupled oscillators, deterministic-random walk and competition between dynamical elements are taken into consideration. Referring to the organizational structure, both regular network based on lattice and more general network, called complex networks, are studied. The study of coupled dynamical elements is concretized by developing computational models applied to two specific domains. The first refers to the using of coupled neural oscillators for visual attention. The main features of the developed models in this thesis are: object-based visual selection, realization of visual perceptual organization by using synchronization / desynchronization among neural oscillators, competition among objects to achieve attention. Moreover, in comparison to other object-based selection models, more visual attributes are employed to define salience of objects. The second domain is related to the development of computational models applied to community detection in complex networks. Two developed models, one based on particle competition and another based on synchronization of Integrate-Fire oscillators, present high detection rate and at the same time low computational complexity. Moreover, the model based on particle competition not only offers a new community detection technique, but also presents an alternative way to realize artificial competitive learning. The study realized in this thesis shows that the unified scheme of dynamics and structure is a powerful tool to solve various computational problems

博士
國立交通大學
機械工程系所
93
Chaos synchronization can be achieved by several methods but there is no easy unified criterion in general. Herein, a general scheme for both unidirectional and mutual coupled systems is proposed to achieve chaos synchronization via stability with respect to partial variables. Follow the procedure of the proposed scheme, the unidirectional coupled systems are discussed first and three sufficient criteria are derived. One of them is suitable for systems without perturbation and the other two are suitable for systems under two kinds of perturbations, vanishing and nonvanishing, respectively. Similar to the unidirectional case, three theorems are proven to ensure occurrence of synchronization for mutual coupled systems. One of them is suitable for systems without perturbation and the other two are suitable for systems under two kinds of perturbations, vanishing and nonvanishing, respectively. In previous six criteria, to guarantee the emergence of synchronization a matrix equation should be satisfied and the estimation of Lipschitz constant is needed. Specifically, the estimate of Lipschitz constant is often conservative. To overcome these two shortcomings, this matrix equation and the estimation of Lipschitz constant are replaced by adopting an adaptive coupling gain and an adaptive estimator, respectively. As a result, a simple and convenient adaptive synchronization is realized for both unidirectional and mutual coupled systems. In the foregoing results, the synchronization discussed indicates the identical synchronization (or complete synchronization). Another kind of synchronization called generalized synchronization which means that there is a functional relation between the states of driving and response systems as time goes to infinity are studied in the chapter 5. Similar, a scheme to achieve chaos generalized synchronization via partial stability is proposed. Follow the procedure of this scheme, one theorem is proven to ensure generalized synchronization for a general kind of unidirectional coupled systems by linear feedback. All the criteria derived in this dissertation work for regular and chaotic systems, linear and nonlinear systems, autonomous and nonautonomous systems. Finally, several systems are simulated numerically to illustrate the theoretical analyses.

碩士
國立交通大學
機械工程系所
96
In this thesis, the chaotic behavior in new Duffing-van der Pol system is studied by phase portraits, time history, Poincaré maps, Lyapunov exponent, bifurcation diagrams, and parametric diagram. A new kind of chaotic generalized synchronization system, pragmatical hybrid projective chaotic generalized synchronization (PHPCGS), is obtained by pragmatical asymptotical stability theorem and adaptive control law. Second new type for chaotic synchronization, pragmatical chaotic symplectic synchronization (PCSS), is obtained by new dynamic surface control and pragmatical asymptotical stability theorem. A new method, using GYC partial region stability theory, is studied for chaos synchronization, chaos control, and chaos anti-control. Moreover, the new Duffing-van der Pol system with Legendre function parameters is studied for chaos and synchronization. Numerical analyses, such as phase portraits and time histories can be provided to verify the effectiveness in all above studies.

碩士
國立交通大學
機械工程學系
100
“Tai Ji”, the great one, is the combination of Yin and Yang, and Tai Ji chaotic system is the combination of “Yang” chaotic system and “Yin” chaotic system. Yang system represents contemporary system, and Yin system means historical system. The eight trigrams, a part of Chinese philosophy, is advance of “Tai Ji”, and they have their own directions, figures, and representations. Trigram synchronization uses three different chaos systems by the figures, and multiple symplectic derivative synchronization is used. Hexagram, advance of the eight trigrams, has two parts, upper and low, which both represent a trigram, and the hexagram synchronization is advance of trigram synchronization. The generalized synchronization is that there exists a functional relationship between the states of the master and those of the slave. A new type of chaotic synchronization, multiple chaotic symplectic synchronization, is obtained with the state variables of the original system and of another different order system as constituents of the functional relation of “partners”. Numerical simulations are provided to verify the effectiveness of the scheme.

碩士
國立交通大學
機械工程學系
100
The generalized synchronization is that there exists a functional relationship between the states of the master and those of the slave. A new type of chaotic synchronization, multiple chaotic symplectic derivative synchronization, is obtained with the state variables of the original system and of another different order system as constituents of the functional relation of “partners”. Numerical simulations are provided to verify the effectiveness of the proposed scheme. In Chinese philosophy, Yin means negative, historical, or feminine principle while Yang is positive, contemporary, or masculine principle. Yin and Yang are two fundamental opposites in Chinese philosophy, and “Tai Ji”, the great one, is the combination of Yin and Yang, which maybe the origin of Cosmos. The eight trigrams is a part of Chinese philosophy, and they have their own direction, figure, and representation. In this thesis,as examples,Kun trigram and Zhen trigram are studied. Combining Kun trigram in upper place and Zhen trigram in lower place can get Kun-Zhen hexagram. Kun-Zhen hexagram can be annotated by chaos and its synchronization.

碩士
國立交通大學
機械工程學系
100
Yin and Yang are two fundamental opposites in Chinese philosophy. Chaos of contemporary Chen system, i.e. Yang chaos of Chen system, has been investigated completely. In this proposal, chaos of historical Chen system, i.e. Yin chaos of Chen system, is studied with comparison to that of Yang chaos by time histories of states, phase portraits, bifurcation diagrams and Lyapunov exponents. Furthermore, by Chinese philosophy, Tai Ji chaos, i.e. Great One chaos, which consists of Yin chaos and Yang chaos, of Chen system is studied firstly. The generalized synchronization is that there exists a functional relationship between the states of the master and those of the slave. A new strategy to achieve chaos generalized synchronization and multiple symplectic derivative synchronization, is obtained with the state variables of the original system and of another different order system as constituents of the functional relation of “partners”. Finally, numerical simulations are given to verify the effectiveness of the proposed scheme examples. “The Book of Changes” is a classic text of Chinese culture. In this thesis, the trigram consisted by three broked lines or unbroken lines forms various chaos synchronization. Numerical simulations in examples of Gen and Xun trigram generalized synchronization are given to verify the effectiveness of the proposed scheme. Finally, combining Gen trigram in upper place and Xun trigram in lower place can get Gen-Xun hexagram. Gen-Xun hexagram can be annotated by Chaos and its synchronization.

碩士
國立交通大學
機械工程學系
100
The generalized synchronization is that there exists a functional relationship between the states of the master and those of the slave. A new type of chaotic synchronization, multiple chaotic symplectic derivative synchronization, is obtained with the state variables of the original system and of another different order system as constituents of the functional relation of “partners”. Numerical simulations are provided to verify the effectiveness of the proposed scheme. In Chinese philosophy, Yin means negative, historical, or feminine principle while Yang is positive, contemporary, or masculine principle. Yin and Yang are two fundamental opposites in Chinese philosophy, and “Tai Ji”, the great one, is the combination of Yin and Yang, which maybe the origin of Cosmos. The eight trigrams is a part of Chinese philosophy, and they have their own direction, figure, and representation. In this thesis, as examples, Qian trigram and Dui trigram are studied, combining Qian trigram in upper place and Dui trigram in lower place can get Qian-Dui hexagram. Qian-Dui hexagram can be annotated by chaos and its synchronization..

碩士
逢甲大學
電機工程所
102
This thesis focuses on the partial discharge analytic measurement results and identification of high-voltage electrical equipment. In the thesis, 161kV Gas Insulation Switch (GIS) as for example, was used to measure the actual measured background value and the discharge of analysis; and explain 161kV GIS equipment construction and testing methods. AIA partial discharge detection device in the field used Acoustic Emission (AE) sensor for measurements sampling, and the main response frequencies are 30~35kHz and 55~60 kHz; low-frequency cut-off frequency is 17 kHz, and the built-in noise suppression sampling frequency range is 10 ~100kHz. Silicon grease must be a little when used. Matlab was used to establish a non-autonomous chaotic synchronization circuit for measuring the actual parameter values input into the construction of non-autonomous chaotic synchronization circuit, analyzing the difference between normal background values and discharge signals. In the future, the measured values are just inputted into the circuit analysis described in this thesis, so you can determine whether the device discharges or not. Particularly when applied to a large number of measurements , determining time can be greatly reduced. Keywords: Partial Discharge、Acoustic Emission、Non-autonomous Chaotic Synchronization

碩士
國立交通大學
機械工程系所
96
The hyperchaotic dynamics of a tachometer system is studied by means of phase portraits, Poincare maps, bifurcation diagram, power spectra and Lyapunov exponents. Pragmatical hybrid projective hyperchaotic generalized synchronization and GYC pragmatical hybrid projective hyperchaotic symplectic synchronization (PHPHSS) of two hyperchaotic tachometer system with different order system as a constituent by adaptive backstepping control are obtained and verified by numerical simulation. Besides, hyperchaotic generalized synchronization and chaos control of tachometer system by GYC partial region stability are proposed. Furthermore, boids control and lag synchronization of tachometer system can be successfully obtained. Finally, numerical simulations are shown they are work.

博士
國立交通大學
機械工程系所
96
This thesis consists of three parts：(1) two theorems of unsynchronizability and synchronization for coupled chaotic systems and two theorems of generalized unsynchronization for coupled chaotic systems. (2) chaos synchronization by variable strength linear coupling and Lyapunov function derivative in series form and adaptive chaos synchronization by variable strength linear coupling. (3) chaos generalized synchronization and chaos control by partial region stability theory.

碩士
國立交通大學
機械工程系所
97
In this thesis, the chaotic behavior in a new Froude-Duffing System is studied by phase portraits, time history, Poincaré maps, Lyapunov exponent and bifurcation diagrams. A new method, using GYC partial region stability theory, is studied for chaos synchronization and chaos control. Hyperchaos of a Rössler System with Bessel Function Parameters is studied. A new kind of chaotic generalized synchronization system, hybrid projective Yin-Yang generalized synchronization (HPYYGS), is obtained by pragmatical asymptotical stability theorem and adaptive control law. Numerical analyses, such as phase portraits and time histories can be provided to verify the effectiveness in all above studies.

碩士
國立交通大學
機械工程系所
96
In this thesis, a new Ikeda-Mackey-Glass (IMG) time-delayed system and a new Ikeda-Lorenz (IL) system are studied. Their chaotic behaviors are presented by phase portraits, bifurcation diagrams, and Lyapunov exponent. When one of delay times is zero, two identical IMG systems cannot be synchronized with slightly different initial conditions. It is found that when one of delay time is positive, different types of synchronization can be obtained with slightly different initial conditions, such as generalized synchronization, anti-synchronization, and generalized lag- synchronization. One chaotization method is presented by using different types of chaos signals as parameters, it can be obtained the chaotic behaviors of a new Ikeda-Mackey-Glass time-delayed system. A new strategy to achieve chaos generalized synchronization and chaos control by GYC partial region stability theory is proposed. The control design method is simple and a less simulation error because they are in lower degree than that of traditional controllers. A new IL system is used to show the effectiveness of the scheme. Finally, estimation of parameters of a new IMG system through synchronization is studied. By a minimization problem, a system of differential equations governing the evolution of parameters is constructed. Two time delay IMG systems are synchronized and their corresponding two parameters converge to same values by solving twelve differential equations. The simulation results are very satisfactory.

碩士
國立交通大學
機械工程系所
97
In this thesis, a new chaotic Froude-van der Pol system is studied. A new strategy of achieving chaos generalized synchronization and chaos control by GYC partial region stability is proposed. Using the GYC partial region stability theory, the Lyapunov function used becomes a simple linear homogeneous function of error states and the controllers are simpler than traditional controllers, and give less simulation error because they are in lower order than that of traditional controllers. The chaotic behaviors of a Lorenz system with Legendre function parameters is firstly studied numerically by time histories of states, phase portraits, Poincaré maps, bifurcation diagram, Lyapunov exponents and parameter diagrams. Abundance of hyperchaos and of chaos is found, which offers the potential for many applications. In this thesis, the behavior of historical Chen system is firstly studied. To our best knowledge, most of contemporary Chen system are researched in detail, but there are no articles in investigating a thorough inquiry about the history of Chen system so far. Therefore, the historical chaos of Chen system with “Yin parameters” is introduced. In this thesis, we employ an applicable coupling parameters by linear coupling strategy to complete the goal of generalized synchronization of Yin and Yang Chen systems and take advantage of using an adaptive Yin-Yang chaos synchronization of Yin and Yang Chen system by pragmatical asymptotically stability theorem. This pragmatical adaptive synchronization of two chaotic systems of which one has uncertain parameters the another has estimated parameters, is achieved by pragmatical asymptotically stability theorem.

Tesi di dottorato relativa al XXV ciclo di dottorato di ricerca in "dinamica non lineare e sistemi complessi" . In the present dissertation we use numerical and analytical techniques, usually employed in dynamical systems analysis and statistical mechanics, in order to characterize the emergence of collective solutions in neural networks of different topologies.

碩士
國立交通大學
機械工程系所
96
This thesis consists of three parts: (1) the chaotic behaviors of are studied numerically by phase portraits, Poincaré maps, bifurcation diagrams, power spectrum and Lyapunov exponent diagrams. (2) system is studied for pragmatical hybrid projective hyperchaotic generalized synchronization (PHPHGS) and pragmatical hybrid projective and symplectic synchronization (PHPSS) with different kinds of different chaotic systems, Duffing-van der Pol system and system, by adaptive backstepping control. (3) chaotic generalized synchronization, chaos control and pragmatical hybrid projective generalized synchronization is studied by partial region stability theory.

Clock synchronization between any two nodes in a Wireless Sensor Network (WSNs) is generally accomplished through exchanging messages and adjusting clock offset and skew parameters of each node’s clock. To cope with unknown network message delays, the clock offset and skew estimation schemes have to be reliable and robust in order to attain long-term synchronization and save energy. A joint clock offset and skew estimation scheme is studied and developed based on the Gaussian Mixture Kalman Particle Filter (GMKPF). The proposed estimation scheme is shown to be a more flexible alternative than the Gaussian Maximum Likelihood Estimator (GMLE) and the Exponential Maximum Likelihood Estimator (EMLE), and to be a robust estimation scheme in the presence of non-Gaussian/nonexponential random delays. This study also includes a sub optimal method called Maximum Likelihood-like Estimator (MLLE) for Gaussian and exponential delays. The computer simulations illustrate that the scheme based on GMKPF yields better results in terms of Mean Square Error (MSE) relative to GMLE, EMLE, GMLLE, and EMLLE, when the network delays are modeled as non-Gaussian/non-exponential distributions or as a mixture of several distributions.

碩士
國立臺灣海洋大學
通訊與導航工程學系
103
This thesis focuses on the design of chaotic synchronization control systems with proportion–integral controller and proportional-integral-derivative controller. Through the multi-objectives particle swarm algorithm, multi-objectives of the chaotic synchronization control system using the derived control gains can be achieved simultaneously. Multi-objective function will be the combination of chaos synchronization errors and control effort of the synchronization system. The control gains of the PI or PID controllers can be obtained by the proposed multi-objective particle swarm algorithm such that minimum synchronization error situations can be reached and the minimum control effort can be found. Finally, using the control gains derived from the proposed multi-objective particle swarm algorithm, the Sprott and Lu chaos synchronization systems will be verified by the Matlab, circuit simulation software MultiSim, and hardware implementation.

碩士
國立高雄第一科技大學
系統資訊與控制研究所
96
A system specification is evoluated from user''s requirements, and based on that its corresponding test cases are developed. However, due to the fractional and discreted requirements, there exists divergances among the specification and the requirements at developing stage, and that makes the requirements difficult to be completely verified by the test cases at acceptance stage. In addition, modifing the corresponding specification and test cases as their requirements changed is a synchronization challenge. Therefore, this research is focused on a developing tool which supports specification refining and test case synchronizing with the requirements. Lacking for electrons, a single atom is unstable and incomplete; however, a molecule appears stable when the constructed atoms are complete by filled up others’ electrons. Similarly, if requirement elements including use case, state, and global variable are considered as particles which like atoms construct requirement like that of molecule, then completeness of the requirement can be verified by checking completeness of the particles. Based on the paricle structure, procedure of the proposed tool is as follows: (1) standardize use cases of requipments to the specifications to present issued requirements for clearifing; (2) show relations among particles to present crossing relations among requipments; (3) generate test paths with functional test cases and structural test cases for complete verifying the requirments; finally, (4) demonstrate the affected test cases by use case change to assess the change coverage for requirement change analysis and version control. Taking a machine assembly industry MES as example, the developed tool not only supports requirement managements including requirement analysis, specification development, and requirement acceptance, but also offer the specification based test cases which guarantee whole requirements being tested. Moreover, this tool can compare the differences of historical versions with use case weighting and test cases for assessing coverage of requirement changes, and then synchronization of requirement change in evaluation process is achieved.