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Leblanc, Jean-Philippe. "Distribution hyperbolique généralisée et applications financières." Mémoire, Université de Sherbrooke, 2003. http://savoirs.usherbrooke.ca/handle/11143/2360.
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Dans ce mémoire nous présentons la distribution hyperbolique généralisée ainsi que quatre de ses sous-classes. La portée de l'analyse de cette distribution peu connue est définie à l'aide des limites de ces paramètres et des distributions qui en découlent. Le second chapitre regroupe la théorie nécessaire aux applications du troisième chapitre. Les applications financières développées dans ce mémoire sont des généralisations de la valeur à risque, de la structure des taux d'intérêts, de la volatilité stochastique et de l'évaluation du prix des options par intégration numérique et par approximation par point fixe. Pour faciliter l'expérimentation statistique nous présentons aussi un algorithme pour générer des variables aléatoires suivant une loi hyperbolique généralisée définie par ces cinq paramètres. Dans le dernier chapitre nous abordons l'estimation et l'utilisation empirique de l'hyperbolique généralisée comme outils d'analyse pour les phénomènes financiers.
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Leblanc, Jean-Philippe. "Distribution hyperbolique généralisée et applications financières." Sherbrooke : Université de Sherbrooke, 2003.
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Sarkis, Mira. "Création d'applications multi-écrans à partir d'applications existantes." Electronic Thesis or Diss., Paris, ENST, 2016. http://www.theses.fr/2016ENST0057.
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L'omniprésence des applications Web, la possession et l'utilisation simultanée de plusieurs appareils par un seul utilisateur sont les principaux facteurs de la demande accrue pour les applications multi-écrans. La création des applications multi-écrans imposent des défis sur le développeur d'applications et sur le designer, en particulier s'ils réutilisent les applications web existantes. Par exemple, les developpeurs doivent planifier la distribution de l'interface utilisateur et ils doivent prendre en compte la diversité des dispositifs pour mieux présenter le contenu. En plus, ils doivent re-penser l'organisation du code de l'application afin de préserver la fonctionnalité de l'application et surtout assurer la communication entre les parties distribuées de l'application. Dans ce travail, nous proposons un système de bout en bout pour le refactoring des applications web. Le système permet la réutilisation des applications existante, mono-écran, pour créer automatiquement des applications multi-écrans. Les parties distribuées des applications générées ont leur mise en page adaptée aux petits et grands dispositifs et ils sont prêts â fonctionner de manière synchrone tout en fournissant des tâches complémentaires. La performance du système est évaluée quantitativement sur un ensemble d'applications contenant au moins un élément vidéo et du contenu interactifThe ubiquity of web applications and the user possession and utilization of multiple devices are major factors for the increased demand for multi-screen applications. Multi-screen applications impose challenges on the application developer and designer especially if existing single-screen applications have to be transformed to the multiscreen environment. Designers should plan the user interface distribution and should adapt the layout for various devices. Developers should re-organize the application logic and associate it to the distributed user interface. They should preserve the application functionality and finally they need to adapt it to the underlying multiscreen platform. In this work, we propose an end-to-end refactoring system. The system allows the re-use of existing single-screen applications to automatically create multi-screen applications. The components of the multi-screen applications have their layout adapted to small and large device and they are ready to operate synchronously to provide a complementary usage experience. Our system is quantitatively evaluated on different sets of applications containing at least one video element and interactive content. The content division of our system corresponds to a ground truth division with an average recall of 0.84. In addition, our layout refactoring approach obtains 60% accuracy on the tested applications. In addition, we evaluate the performance of the run-time behavior of one application and we compute the delays that are caused by our system and by the network in a real physical environment: with a total delay of 5 ms, our solution is realistic
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George, Michael. "Distribution feeder reduction for dispersed generation applications." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=117136.
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Electric power systems today are undergoing a paradigm shift in operational and market philosophy through technologies like distributed generation and the "smart grid." Decentralizing the power system and allowing users to inject power into the grid, however, introduces a wide array of problems, and much research has gone towards implementing a growing number of small generation sources throughout the existing electric power network infrastructure. This thesis describes the issues involved in reducing a typical rural distribution feeder to a model that can be used for distributed generation interconnection studies, particularly for islanding studies.Nos systèmes de puissance électrique procèdent présentement à un changement de paradigme autant dans leurs philosophies opérationnelles que dans celles du marché grâce à des technologies telles que la génération distribuée et la plateforme «smart grid». Décentraliser le système d'énergie et permettre aux usagers d'injecter de l'énergie dans le réseau présente néanmoins de nombreux problèmes, et beaucoup de nouvelles études cherchent à établir un nombre croissant de petites sources de génération dans le cadre du réseau d'infrastructure d'énergie électrique existant présentement. Cette thèse décrit les questions liées à la réduction d'une artère de distribution rurale typique d'un modèle qui peut être utilisé pour des études d'interconnexion distribués génération, en particulier pour les études îlotage.
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Jiang, Xiao. "Contributions to statistical distribution theory with applications." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/contributions-to-statistical-distribution-theory-with-applications(fa612f53-1950-48c2-9cdf-135b2d145587).html.
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The whole thesis contains 10 chapters. Chapter 1 is the introductory chapter of my thesis and the main contributions are presented in Chapter 2 through to Chapter 9. Chapter 10 is the conclusion chapter. These chapters are motivated by applications to new and existing problems in finance, healthcare, sports, and telecommunications. In recent years, there has been a surge in applications of generalized hyperbolic distributions in finance. Chapter 2 provides a review of generalized hyperbolic and related distributions, including related programming packages. A real data application is presented which compares some of the distributions reviewed. Chapter 3 and Chapter 4 derive conditions for stochastic, hazard rate, likelihood ratio, reversed hazard rate, increasing convex and mean residual life orderings of Pareto distributed variables and Weibull distributed variables, respectively. A real data application of the conditions is presented in each chapter. Motivated by Lee and Cha [The American Statistician 69 (2015) 221-230], Chapter 5 introduces seven new families of discrete bivariate distributions. We reanalyze the football data in Lee and Cha (2015) and show that some of the newly proposed distributions provide better fits than the two families proposed by Lee and Cha (2015). Chapter 6 derives the distribution of amplitude, its moments and the distribution of phase for thirty-four flexible bivariate distributions. The results in part extend those given in Coluccia [IEEE Communications Letters, 17, 2013, 2364-2367]. Motivated by Schoenecker and Luginbuhl [IEEE Signal Processing Letters, 23, 2016, 644-647], Chapter 7 studies the characteristic function of products of two independent random variables. One follows the standard normal distribution and the other follows one of forty other continuous distributions. In this chapter, we give explicit expressions for the characteristic function of products, and some of the results are verified by simulations. Cossette, Marceau, and Perreault [Insurance: Mathematics and Economics, 64, 2015, 214-224] derived formulas for aggregation and capital allocation based on risks following two bivariate exponential distributions. Chapter 8 derives formulas for aggregation and capital allocation for thirty-three commonly known families of bivariate distributions. This collection of formulas could be a useful reference for financial risk management. Chapter 9 derives expressions for the kth moment of the dependent random sum using copulas. It also extends Mao and Zhao[IMA Journal of Management Mathematics, 25, 2014, 421-433]âs results to the case where the components of the sum are not identically distributed. The practical usefulness of the results in terms of computational time and computational accuracy is demonstrated by simulation.
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Chu, Jeffrey. "Statistical distribution theory with applications to finance." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/statistical-distribution-theory-with-applications-to-finance(415d8a76-64d1-4c78-a299-a931f7e1b48c).html.
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The whole thesis comprises six chapters, where the running theme focuses on the development of statistical methods and distribution theory, with applications to finance. It begins with Chapter 1, which provides the introduction and background to my thesis. This is then followed by Chapters 2 through to 6, which provide the main contributions. The exact distribution of the sum of more than two independent beta random variables is not a known result. Even in terms of approximations, only the normal approximation is known for the sum. Motivated by Murakami (2014), Chapter 2 derives a saddlepoint approximation for the distribution of the sum. An extensive simulation study shows that it always gives better performance than the normal approximation. Jin et al. (2016) proposed a novel moments based approximation based on the gamma distribution for the compound sum of independent and identical random variables, and illustrated their approximation through the use of six examples. Chapter 3 revisits four of their examples, and it is shown that moments based approximations based on simpler distributions can be good competitors. The moments based approximations are also shown to be more accurate than the truncated versions of the exact distribution of the compound sum. Results regarding the performances of the approximations are provided, which could be useful in determining which approximation should be used given a real data set. The estimation of the size of large populations can often be a significant problem. Chapter 4 proposes a new population size estimator and provides a comparison of its performance with two recent estimators known in the literature. The comparison is based on a simulation study and applications to two real big data sets from the Twitter and LiveJournal social networks. The proposed estimator is shown to outperform the known estimators, at least for small sample sizes. In recent years, with a growing interest in big or large datasets, there has been a rise in the application of large graphs and networks to financial big data. Much of this research has focused on the construction and analysis of the network structure of stock markets, based on the relationships between stock prices. Motivated by Boginski et al. (2005), who studied the characteristics of a network structure of the US stock market, Chapter 5 constructs network graphs of the UK stock market using the same method. Four distributions are fitted to the degree density of the vertices from these graphs: the Pareto I, Frechet, lognormal, and generalised Pareto distributions, and their goodness of fits are assessed. Results show that the degree density of the complements of the market graphs, constructed using a negative threshold value close to zero, can be fitted well with the Frechet and lognormal distributions. Chapter 6 analyses statistical properties of the largest cryptocurrencies (determined by market capitalisation), of which Bitcoin is the most prominent example. The analysis characterises their exchange rates versus the US Dollar by fitting parametric distributions to them. It is shown that cryptocurrency returns are clearly non-normal, however, no single distribution fits well jointly to all of the cryptocurrencies analysed. We find that for the most popular cryptocurrencies, such as Bitcoin and Litecoin, the generalised hyperbolic distribution gives the best fit, whilst for the smaller cryptocurrencies the normal inverse Gaussian distribution, generalised t distribution, and Laplace distribution give good fits. The results are important for investment and risk management purposes.
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Chabbouh, Ikram. "Fracs : un système de fragmentation et de distribution d'applications Web." Paris 6, 2007. http://www.theses.fr/2007PA066582.
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Le but de cette thèse est de proposer une solution efficace pour améliorer les performances des applications Web. Les systèmes d’accélération visent, en particulier, à résoudre ce problème. Le système que nous proposons s’appelle FRACS. L’idée centrale de FRACS est de fragmenter les applications Web, identifier les fragments réplicables, et les répliquer dynamiquement avec les tables de la base de données qu’ils accèdent, en vue de générer le contenu dynamique demandé au niveau du réseau. FRACS cache également le résultat d’exécution des fragments lorsque cela est possible pour accélérer la génération du contenu dynamique. FRACS a principalement quatre majeures contributions. D’abord, il fournit un module qui fragmente automatiquement le code des applications Web d’une manière statique. Les filtres représentent également une contribution intéressante de FRACS. En plus d’identifier le contenu généré d’une manière unique, les filtres permettent de déterminer les identificateurs des fragments nécessaires à la construction d’une page, même si l’URL exacte de cette page n’a pas été accédée. Une autre contribution de notre travail réside dans les protocoles de cohérence proposés pour les fragments de contenu cachés et les bases de données partiellement répliquées. Enfin contrairement aux CDNs existants, FRACS permet aux fournisseurs de contenu d’adapter les politiques de réplication du CDN aux besoins spécifiques de leurs applications, ainsi que de maîtriser leur utilisation des ressources du CDN.
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Reggente, Matteo. "Statistical gas distribution modelling for mobile robot applications." Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-37896.
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In this dissertation, we present and evaluate algorithms for statistical gas distribution modelling in mobile robot applications. We derive a representation of the gas distribution in natural environments using gas measurements collected with mobile robots. The algorithms fuse different sensors readings (gas, wind and location) to create 2D or 3D maps. Throughout this thesis, the Kernel DM+V algorithm plays a central role in modelling the gas distribution. The key idea is the spatial extrapolation of the gas measurement using a Gaussian kernel. The algorithm produces four maps: the weight map shows the density of the measurements; the confidence map shows areas in which the model is considered being trustful; the mean map represents the modelled gas distribution; the variance map represents the spatial structure of the variance of the mean estimate. The Kernel DM+V/W algorithm incorporates wind measurements in the computation of the models by modifying the shape of the Gaussian kernel according to the local wind direction and magnitude. The Kernel 3D-DM+V/W algorithm extends the previous algorithm to the third dimension using a tri-variate Gaussian kernel. Ground-truth evaluation is a critical issue for gas distribution modelling with mobile platforms. We propose two methods to evaluate gas distribution models. Firstly, we create a ground-truth gas distribution using a simulation environment, and we compare the models with this ground-truth gas distribution. Secondly, considering that a good model should explain the measurements and accurately predicts new ones, we evaluate the models according to their ability in inferring unseen gas concentrations. We evaluate the algorithms carrying out experiments in different environments. We start with a simulated environment and we end in urban applications, in which we integrated gas sensors on robots designed for urban hygiene. We found that typically the models that comprise wind information outperform the models that do not include the wind data.
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Kasolis, Fotios. "The Material Distribution Method : Analysis and Acoustics applications." Doctoral thesis, Umeå universitet, Institutionen för datavetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-92538.
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For the purpose of numerically simulating continuum mechanical structures, different types of material may be represented by the extreme values {
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Blasi, Bronson Richard. "DC microgrids: review and applications." Kansas State University, 2013. http://hdl.handle.net/2097/16823.
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Master of ScienceDepartment of Architectural Engineering and Construction Science
Fred Hasler
This paper discusses a brief history of electricity, specifically alternating current (AC) and direct current (DC), and how the current standard of AC distribution has been reached. DC power was first produced in 1800, but the shift to AC occurred in the 1880’s with the advent of the transformer. Because the decisions for distribution were made over 100 years ago, it could be time to rethink the standards of power distribution. Compared to traditional AC distribution, DC microgrids are significantly more energy efficient when implemented with distributed generation. Distributed generation, or on-site generation from photovoltaic panels, wind turbines, fuel cells, or microturbines, is more efficient when the power is transmitted by DC. DC generation, paired with the growing DC load profile, increases energy savings by utilizing DC architecture and eliminating wasteful conversions. Energy savings would result from a lower grid strain and more efficient utilization of the utility grid. DC distribution results in a more reliable electrical service due to short transmission distances, high service reliability when paired with on-site generation, and efficient storage. Occupant safety is a perceived concern with DC microgrids due to the lack of knowledge and familiarity in regards to these systems. However, with proper regulation and design standards, building occupants never encounter voltage higher than 24VDC, which is significantly safer than existing 120VAC in the United States. DC Microgrids have several disadvantages such as higher initial cost due, in part, to unfamiliarity of the system as well as a general lack of code recognition and efficiency metric recognition leading to difficult certification and code compliance. Case studies are cited in this paper to demonstrate energy reduction possibilities due to the lack of modeling ability in current energy analysis programs and demonstrated energy savings of approximately 20%. It was concluded that continued advancement in code development will come from pressure to increase energy efficiency. This pressure, paired with the standardization of a 24VDC plug and socket, will cause substantial increases in DC microgrid usage in the next 10 years.
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Amblard, Zoé. "Cryptographie quantique et applications spatiales." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0113.
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Cette thèse réalisée en collaboration avec l’entreprise Thales Alenia Space, qui étudie les protocoles de cryptographie quantique à n parties en dimension d, a un double objectif. D’une part, nous analysons la famille des inégalités de Bell homogènes introduites par par François Arnault dans [1] afin de proposer des outils théoriques pour leur compréhension et leur implémentation à l’aide d’appareils optiques appelés ditters dont une représentation mathématique est donnée par Zukowski et al. dans [2]. Avec ces outils théoriques, nous proposons de nouveaux protocoles cryptographiques en dimension d qui sont décrits dans [3] et qui utilisent ces inégalités. D’autre part, nous étudions les avantages et inconvénients de la cryptographie quantique pour la protection des communications avec un satellite LEO en environnement bruité dans différents scénarios et, pour chacun de ces scénarios, nous concluons sur l’intérêt d’utiliser des protocoles de Distribution Quantique de ClésThis thesis in collaboration with Thales Alenia Space studies quantum cryptographic protocols for n parties in dimension d. We first analyze the family of Bell inequalities called homogeneous Bell inequalities introduces by François Arnault in [1] and we construct several theoretical tools for a better understanding of these inequalities. With these tools, we show how to implement the measurements required to test these inequalities by using optical devices calleds multiport beamsplitters and described by Zukowski et al. in [2]. We use these devices to construct new cryptographic protocols in dimension d called hdDEB which we describe in [3]. Then, we study advantages and drawbacks of the use of quantum cryptography to protect satellite links in a noisy environment. We consider several scenarios with LEO satellites and, for each of them, we conclude about the interest of using Quantum Key Distribution protocols
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Rohrwild, Jürgen Holger. "Renormalization and applications of baryon distribution amplitudes in QCD." kostenfrei, 2009. http://www.opus-bayern.de/uni-regensburg/volltexte/2009/1317/.
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McNinch, Michael D. "Geographic Information System Applications for Water Distribution Asset Management." Connect to resource online, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1254859492.
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Elamir, Elsayed Ali Habib. "Probability distribution theory, generalisations and applications of L-moments." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3987/.
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In this thesis, we have studied L-moments and trimmed L-moments (TL-moments) which are both linear functions of order statistics. We have derived expressions for exact variances and covariances of sample L-moments and of sample TL-moments for any sample size n in terms of first and second-order moments of order statistics from small conceptual sample sizes, which do not depend on the actual sample size n. Moreover, we have established a theorem which characterises the normal distribution in terms of these second-order moments and the characterisation suggests a new test of normality. We have also derived a method of estimation based on TL-moments which gives zero weight to extreme observations. TL-moments have certain advantages over L-moments and method of moments. They exist whether or not the mean exists (for example the Cauchy distribution) and they are more robust to the presence of outliers. Also, we have investigated four methods for estimating the parameters of a symmetric lambda distribution: maximum likelihood method in the case of one parameter and L-moments, LQ-moments and TL-moments in the case of three parameters. The L-moments and TL-moments estimators are in closed form and simple to use, while numerical methods are required for the other two methods, maximum likelihood and LQ-moments. Because of the flexibility and the simplicity of the lambda distribution, it is useful in fitting data when, as is often the case, the underlying distribution is unknown. Also, we have studied the symmetric plotting position for quantile plot assuming a symmetric lambda distribution and conclude that the choice of the plotting position parameter depends upon the shape of the distribution. Finally, we propose exponentially weighted moving average (EWMA) control charts to monitor the process mean and dispersion using the sample L-mean and sample L-scale and charts based on trimmed versions of the same statistics. The proposed control charts limits are less influenced by extreme observations than classical EWMA control charts, and lead to tighter limits in the presence of out-of-control observations.
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Rodrigues, Flavio Alles. "Study of load distribution measures for high-performance applications." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/149593.
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Balanceamento de carga é essencial para que aplicações paralelas tenham desempenho adequado. Conforme sistemas de computação paralelos crescem, o custo de uma má distribuição de carga também aumenta. Porém, o comportamento dinâmico que a carga computacional possui em certas aplicações pode induzir disparidades na carga atribuída a cada recurso. Portanto, o repetitivo processo de redistribuição de carga realizado durante a execução é crucial para que problemas de grande escala que possuam tais características possam ser resolvidos. Medidas que quantifiquem a distribuição de carga são um importante aspecto desse procedimento. Por estas razões, métricas frequentemente utilizadas como indicadores da distribuição de carga em aplicações paralelas são investigadas nesse estudo. Dado que balanceamento de carga é um processo dinâmico e recorrente, a investigação examina como tais métricas quantificam a distribuição de carga em intervalos regulares durante a execução da aplicação paralela. Seis métricas são avaliadas: percent imbalance, imbalance percentage, imbalance time, standard deviation, skewness e kurtosis. A análise revela virtudes e deficiências que estas medidas possuem, bem como as diferenças entres as mesmas como descritores da distribuição de carga em aplicações paralelas. Uma investigação como esta não tem precedentes na literatura especializada.Load balance is essential for parallel applications to perform at their highest possible levels. As parallel systems grow, the cost of poor load distribution increases in tandem. However, the dynamic behavior the distribution of load possesses in certain applications can induce disparities in computational loads among resources. Therefore, the process of repeatedly redistributing load as execution progresses is critical to achieve the performance necessary to compute large scale problems with such characteristics. Metrics quantifying the load distribution are an important facet of this procedure. For these reasons, measures commonly used as load distribution indicators in HPC applications are investigated in this study. Considering the dynamic and recurrent aspect in load balancing, the investigation examines how these metrics quantify load distribution at regular intervals during a parallel application execution. Six metrics are evaluated: percent imbalance, imbalance percentage, imbalance time, standard deviation, skewness, and kurtosis. The analysis reveals the virtues and deficiencies each metric has, as well as the differences they register as descriptors of load distribution progress in parallel applications. As far as we know, an investigation as the one performed in this work is unprecedented.
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Ngunkeng, Grace. "Statistical Analysis of Skew Normal Distribution and its Applications." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1370958073.
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Delmas, Céline. "Distribution du maximum d'un champ aléatoire et applications statistique." Toulouse 3, 2001. http://www.theses.fr/2001TOU30212.
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Montanari, C. P. "The raindrop size distribution and applications to scattering and extinction." Thesis, University of Portsmouth, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339584.
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Frazao, Rodrigo José Albuquerque. "PMU based situation awareness for smart distribution grids." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT061/document.
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Une infrastructure robuste de surveillance basée sur des mesures numériques classiques est souvent utilisée pour permettre une gestion efficace du réseau de distribution électrique, néanmoins les mesures de phaseurs synchronisés, également connu comme synchrophaseurs, sont particulièrement efficaces pour améliorer la capacité de gestion et la surveillance de ces réseaux. Le synchrophaseur est un phaseur numériquement calculé à partir des échantillons de données en utilisant une source temporelle absolue pour un horodatage extrêmement précis des mesures effectuées.De ce fait, les applications des synchrophaseurs sont très nombreuses dans les réseaux électriques, en particulier dans les réseaux de transport. Ils permettent notamment de mesurer la différence angulaire entre les noeuds, l'estimation d'état linéaire, détecter l'îlotage, surveiller la stabilité oscillatoire, et détecter et identifier les défauts. Ainsi, nous pourrions être amenés à croire que pour apporter les avantages bien connus des mesures synchronisées vers les réseaux de distribution électriques, il serait seulement nécessaire de placer les Unités de Mesure de Phaseur, également connu par l'abréviation anglophone PMU, d'une manière directe dans l'environnement de la distribution électrique. Malheureusement, cette tâchen'est pas aussi évidente qu'elle n'y paraît.Les réseaux de distribution électriques et les réseaux de transport ont des caractéristiques opérationnelles différentes, donc les PMUs dédiées aux réseaux de distribution doivent avoir des caractéristiques différentes de celles consacrées aux réseaux haute tension. Les réseaux de distribution intelligents possèdent des longueurs de ligne plus courtes en produisant une ouverture angulaire plus petite entre les noeuds adjacents. En outre, le contenu harmonique élevé et la déviation en fréquence imposent aussi des défis pour l'estimation des phaseurs. Les appareils synchronisés avancés dédiés pour la surveillance du réseau de distribution doivent surmonter ces défis afin de mener la précision des mesures au-delà des exigences actuelles.Cette problématique globale est traitée et évaluée dans la présente thèse. La précision de l'estimation de phaseur est directement liée à la performance de l'algorithme utilisé pour traiter les données. Une grande robustesse contre les effets pernicieux qui peuvent dégrader la qualité des estimations est fortement souhaitée. De ce fait, trois algorithmes adaptifs en fréquence sont présentés en visant l'amélioration du processus d'estimation des mesures de phaseurs dans les réseaux de distribution actifs. Plusieurs simulations en utilisant des signaux corrompus sont réalisées pour évaluer leurs performances dans des conditions statiques et/ou dynamiques.Prenant en compte l'estimation précise des phaseurs, quatre applications potentielles sont présentées pour augmenter la perception, la compréhension et la projection des actions dans les réseaux de distribution. Des contributions sont apportées concernant le circuit équivalent de Thévenin vu par le point de couplage commun (PCC) entre la production décentralisée et les réseaux de distribution. Des contributions sont également apportées pour les équivalents dynamiques externes et l'évaluation de la chute de tension dans les réseaux moyenne-tension radiaux, ainsi que l'évaluation de la problématique des harmoniques pour l'amélioration de la méthode classique nomée PH (puissance active harmonique) pour détecter à la fois la principale source de pollution harmonique et le vrai flux de puissance harmonique sous déviation en fréquence.Le sujet des mesures de phaseurs synchronisés dans le réseaux électrique de distribution est encore peu exploré et les questionnements quant à son applicabilité sont communs, néanmoins cette thèse vise à fournir des propositions pour contribuer à l'avènement de mesures de phaseurs dans l'environnement de la distribution électriqueRobust metering infrastructure based on classical digital measurements has been used to enable a comprehensive power distribution network management, however synchronized phasor measurements, also known as synchrophasors, are especially welcome to improve the overall framework capabilities. Synchrophasor is a phasor digitally computed from data samples using an absolute and accuracy time source as reference. In this way, since the absolute time source has sufficient accuracy to synchronize voltage and current measurements at geographically distant locations, it is possible to extract valuable informations of the real grid operating status without full knowledge of its characteristics.Due to this fact, applications of synchronized phasor measurements in wide-area management systems (WAMSs) have been achieved. Angular separation, linear state estimation, islanding detection, oscillatory stability, and disturbance location identification are some of the several applications that have been proposed. Thus, we could be lead to believe that to bring the well-known benefits of the synchronized measurements toward electric distribution grids it is only required to place in a straightforward manner conventional Phasor Measurement Units (PMUs) into the electric distribution environment. Unfortunately, this is not as simple as it seems.Electric power distribution systems and high-voltage power systems have different operational characteristics, hence PMUs or PMU-enabled IEDs dedicated to distribution systems should have different features from those devoted to the high-voltage systems. Active distribution grids with shorter line lengths produce smaller angular aperture between their adjacent busbars. In addition, high harmonic content and frequency deviation impose more challenges for estimating phasors. Generally, frequency deviation is related to high-voltage power systems, however, due to the interconnected nature of the overall power system, frequency deviation can be propagated toward the distribution grid. The integration of multiple high-rate DERs with poor control capabilities can also impose local frequency drift. Advanced synchronized devices dedicated to smart monitoring framework must overcome these challenges in order to lead the measurement accuracy beyond the levels stipulated by current standard requirements.This overall problematic is treated and evaluated in the present thesis. Phasor estimation accuracy is directly related to the algorithm's performance used for processing the incoming data. Robustness against pernicious effects that can degrade the quality of the estimates is highly desired. Due to this fact, three frequency-adaptive algorithms are presented aiming to boost the phasor estimation process in active distribution grids. Several simulations using spurious and distorted signals are performed for evaluating their performances under static and/or dynamic conditions.Taking into account accurate phasor estimates, four potential applications are presented seeking to increase situational awareness in distribution environment. Contributions are presented concerning online Thévenin's equivalent (TE) circuit seen by the Point of Common Coupling (PCC) between DERs and the grid side, dynamic external equivalents and online three-phase voltage drop assessment in primary radial distribution grids, as well as assessment of harmonic issues for improving the classical PH method (harmonic active power) to detect both the main source of harmonic pollution and true power flow direction under frequency deviation.The issue of synchronized phasor measurements in electric power distribution systems is still underexplored and suspicions about its applicability are common, however this thesis aims to provide propositions to contribute with the advent of phasor measurements in electric distribution environment
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Chang, Ilsung. "Bayesian inference on mixture models and their applications." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3990.
Full textAbstract:
Mixture models are useful in describing a wide variety of random phenomena because
of their flexibility in modeling. They have continued to receive increasing attention
over the years from both a practical and theoretical point of view. In their applications,
estimating the number of mixture components is often the main research
objective or the first step toward it. Estimation of the number of mixture components
heavily depends on the underlying distribution. As an extension of normal
mixture models, we introduce a skew-normal mixture model and adapt the reversible
jump Markov chain Monte Carlo algorithm to estimate the number of components
with some applications to biological data.
The reversible jump algorithm is also applied to the Cox proportional hazard
model with frailty. We consider a regression model for the variance components in
the proportional hazards frailty model. We propose a Bayesian model averaging procedure
with a reversible jump Markov chain Monte Carlo step which selects the model
automatically. The resulting regression coefficient estimates ignore the model uncertainty
from the frailty distribution. Finally, the proposed model and the estimation
procedure are illustrated with simulated example and real data.
21
Sun, Yannan. "Extremal dependence of multivariate distributions and its applications." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/Y_SUN_041610.pdf.
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Ratanapanachote, Somnida. "Applications of an electronic transformer in a power distribution system." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2756.
Full textAbstract:
In electrical power distribution and power electronic applications, a transformer is an indispensable component which performs many functions. At its operating frequency (60/50 Hz), it is one of the most bulky and expensive components. The concept of the electronic transformer introduced previously has shown considerable reduction in size, weight, and volume by operating at a higher frequency.
In this dissertation, the concept of the electronic transformer is further extended to the auto-connected phase-shifting type to reduce harmonics generated by nonlinear loads. It is shown that with the addition of primary side and secondary side AC/AC converters achieves phase-shifting. With the addition of converters, magnetic components are operated at a higher frequency to yield a smaller size and weight. Two types of auto-connected electronic transformer configurations are explored. In the first configuration, the secondary converter is eliminated and the output is suitable for rectifier type loads such as adjustable speed drives. In the second configuration, the
secondary converter is added to obtain a sinusoidal phase-shifted AC output voltage. This approach is applicable in general applications. With the proposed approaches, the th and 7th harmonic in utility line currents, generated by two sets of nonlinear loads, are subtracted within the electronic transformer, thereby reducing the total harmonic distortion (THD) of the line current. The analysis and simulation results are presented.
In the second part of the dissertation, the electronic transformer concept is applied to a telecommunication power supply (-48 VDC) system. The proposed approach consists of a matrix converter to convert the low frequency three-phase input AC utility to a high frequency AC output without a DC-link. The output of the matrix converter is then processed via a high frequency isolation transformer to produce -48 VDC. Digital control of the system ensures that the output voltage is regulated and the input currents are of high quality, devoid of low frequency harmonics and at near unity input power factor under varying load conditions. Due to the absence of DC-link electrolytic capacitors, the power density of the proposed rectifier is shown to be higher. Analysis, design example and experimental results are presented from a three-phase 208 V, 1.5 kW laboratory prototype converter.
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Bauer, Hartmut. "The distribution of values of Artin L-functions and applications /." Berlin, 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=96093927X.
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Morley, Mark S. "A framework for evolutionary optimization applications in water distribution systems." Thesis, University of Exeter, 2008. http://hdl.handle.net/10036/42400.
Full textAbstract:
The application of optimization to Water Distribution Systems encompasses the use of computer-based techniques to problems of many different areas of system design, maintenance and operational management. As well as laying out the configuration of new WDS networks, optimization is commonly needed to assist in the rehabilitation or reinforcement of existing network infrastructure in which alternative scenarios driven by investment constraints and hydraulic performance are used to demonstrate a cost-benefit relationship between different network intervention strategies. Moreover, the ongoing operation of a WDS is also subject to optimization, particularly with respect to the minimization of energy costs associated with pumping and storage and the calibration of hydraulic network models to match observed field data. Increasingly, Evolutionary Optimization techniques, of which Genetic Algorithms are the best-known examples, are applied to aid practitioners in these facets of design, management and operation of water distribution networks as part of Decision Support Systems (DSS). Evolutionary Optimization employs processes akin to those of natural selection and “survival of the fittest” to manipulate a population of individual solutions, which, over time, “evolve” towards optimal solutions. Such algorithms are characterized, however, by large numbers of function evaluations. This, coupled with the computational complexity associated with the hydraulic simulation of water networks incurs significant computational overheads, can limit the applicability and scalability of this technology in this domain. Accordingly, this thesis presents a methodology for applying Genetic Algorithms to Water Distribution Systems. A number of new procedures are presented for improving the performance of such algorithms when applied to complex engineering problems. These techniques approach the problem of minimising the impact of the inherent computational complexity of these problems from a number of angles. A novel genetic representation is presented which combines the algorithmic simplicity of the classical binary string of the Genetic Algorithm with the performance advantages inherent in an integer-based representation. Further algorithmic improvements are demonstrated with an intelligent mutation operator that “learns” which genes have the greatest impact on the quality of a solution and concentrates the mutation operations on those genes. A technique for implementing caching of solutions – recalling the results for solutions that have already been calculated - is demonstrated to reduce runtimes for Genetic Algorithms where applied to problems with significant computation complexity in their evaluation functions. A novel reformulation of the Genetic Algorithm for implementing robust stochastic optimizations is presented which employs the caching technology developed to produce an multiple-objective optimization methodology that demonstrates dramatically improved quality of solutions for given runtime of the algorithm. These extensions to the Genetic Algorithm techniques are coupled with a supporting software library that represents a standardized modelling architecture for the representation of connected networks. This library gives rise to a system for distributing the computational load of hydraulic simulations across a network of computers. This methodology is established to provide a viable, scalable technique for accelerating evolutionary optimization applications.
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Husband, Paul Stewart. "Discolouration in water distribution systems : understanding, modelling and practical applications." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531117.
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Alentorn, Amadeo. "Option pricing with the Generalized Extreme Value distribution and applications." Thesis, University of Essex, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437818.
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Hollinger, Kenneth B. "Code optimization for the Choi-Williams distribution for ELINT applications." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FHollinger.pdf.
Full textAbstract:
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2009.Thesis Advisor(s): Fouts, Douglas J. ; Pace, Phillip E. "December 2009." Description based on title screen as viewed on January 27, 2010. Author(s) subject terms: Choi-Williams Distribution, Signal Processing, Algorithm Optimization, C programming, Low Probability of Intercept (LPI), Radar detection, Radar classification. Includes bibliographical references (p. 75-76). Also available in print.
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Banerjee, Anirban. "Measuring and modeling applications for content distribution in the Internet." Diss., [Riverside, Calif.] : University of California, Riverside, 2008. http://proquest.umi.com/pqdweb?index=0&did=1663077961&SrchMode=2&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1265225554&clientId=48051.
Full textAbstract:
Thesis (Ph. D.)--University of California, Riverside, 2008.Includes abstract. Title from first page of PDF file (viewed February 3, 2010). Available via ProQuest Digital Dissertations. Includes bibliographical references. Also issued in print.
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Paridari, Kaveh. "Optimal and Resilient Control with Applications in Smart Distribution Grids." Licentiate thesis, KTH, Reglerteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191307.
Full textAbstract:
The electric power industry and society are facing the challenges and opportunities of transforming the present power grid into a smart grid. To meet these challenges, new types of control systems are connected over IT infrastructures. While this is done to meet highly set economical and environmental goals, it also introduces new sources of uncertainty in the control loops. In this thesis, we consider control design taking some of these uncertainties into account. In Part I of the thesis, some economical and environmental concerns in smart grids are taken into account, and a scheduling framework for static loads (e.g., smart appliances in residential areas) and dynamic loads (e.g., energy storage systems) in the distribution level is investigated. A robust formulation is proposed taking the user behavior uncertainty into account, so that the optimal scheduling cost is less sensitive to unpredictable changes in user preferences. In addition, a novel distributed algorithm for the studied scheduling framework is proposed, which aims at minimizing the aggregated electricity cost of a network of apartments sharing an energy storage system. We point out that the proposed scheduling framework is applicable to various uncertainty sources, storage technologies, and programmable electrical loads. In Part II of the thesis, we study smart grid uncertainty resulting from possible security threats. Smart grids are one of the most complex cyber-physical systems considered, and are vulnerable to various cyber and physical attacks. The attack scenarios consider cyber adversaries that may corrupt a few measurements and reference signals, which may degrade the system’s reliability and even destabilize the voltage magnitudes. In addition, a practical attack-resilient framework for networked control systems is proposed. This framework includes security information analytics to detect attacks and a resiliency policy to improve the performance of the system running under the attack. Stability and optimal performance of the networked control system under attack and by applying the proposed framework, is proved here. The framework has been applied to an energy management system and its efficiency is demonstrated on a critical attack scenario.QC 20160830
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Kaviani, Nima. "Partitioning and distribution of web applications to the hybrid cloud." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50017.
Full textAbstract:
Hybrid cloud deployment is an effective strategy in deploying software services
across public cloud and private infrastructure. It allows deployed software
systems to benefit from cost savings and scalability offerings of the
cloud while keeping control over privacy- or security-sensitive code and data
entities. However, the complexity of determining which code and data entities
should reside on-premises, and which can be migrated to the cloud
is daunting. Researchers have attempted to address this complexity by using
partitioning algorithms to optimize distribution and deployment of code
entities across public cloud and private infrastructure. However, we have
identified the following shortfalls with the existing research work:
Current research does not provide enough flexibility in placement of
software function execution and data entities between public/private
hosts. In particular it does not allow for replication or optimized
separation of code and data entities in relation to one another.
Current research on partitioning of software systems does not explicitly
consider the dynamics of a hybrid cloud deployment when making
decisions about public cloud and private infrastructure. Particularly,
current research lacks support for making explicit tradeoff s between
monetary cost and improved performance in hybrid cloud software
systems. The dynamics of the cloud require partitioning algorithms to be tailored towards features inherent to a hybrid cloud deployment. This includes
encoding data dependency models and component dependency
models of a software system collectively into one unique mathematical
optimization model. There is no existing algorithm that allows
for combined code and data dependency requirements to be modelled
under one optimization formula. This thesis presents my work on implementing algorithms and tools that address the shortcomings of the previous research as discussed above. These algorithms and tools are put together under a partitioning and distribution framework named Manticore. Manticore has been used to drive partitioning and deployment decisions on several open source software systems. The experiment results show an estimate of up to 54% reduction in monetary costs compared to a premises only deployment and 56% improvement in performance compared to a na ive separation of code entities from data entities in a hybrid cloud deployment.Science, Faculty of
Computer Science, Department of
Graduate
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Whitehead, Lorne Arthur. "Transport and distribution of light energy for illuminating engineering applications." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29318.
Full textAbstract:
This thesis concerns the transport of light along a class of cylindrical hollow optical structures, with an aim to develop practical light transport and distribution systems for illuminating engineering applications.
Based on intuition, it is postulated that it may be possible to guide light energy in a hollow cylindrical optical structure, by means of total internal reflection on the external surfaces. Such a development would allow light to be guided with the efficiency of optical fibres, but with reduced material costs.
In order to assess this possibility, a new technique is presented for analytic ray tracing in general cylindrical structures. The technique makes it possible to trace ray paths in the cross sectional plane of the structure, with the motion in the dimension out of the cross sectional plane precisely taken into account with a simple correction. This technique greatly simplifies the ray tracing calculations which are necessary to study the light transport properties of the proposed structures. It is then shown with the aid of this technique that a certain class of prismatic structures do indeed have the capability of guiding light, and members of this class are termed prism light guides.
In any real prism light guide, light is not conducted perfectly, but is lost as a result of a number of deviations from the ideal model. Of these, the one intrinsic loss mechanism, which distinguishes a prism light guide from optical fibres, is diffraction at the corners of the prismatic surfaces. Fortunately, diffraction effects are significantly smaller than losses from practical imperfections in prism light guides. A detailed study of the other types of loss mechanisms is then presented. These arise from imperfections of the optical material comprising the prism light guide (absorption and scatter), and imperfections in the shape of the prism light guide. The importance of these effects is discussed first in an approximate assessment, and they are then modelled precisely by means of computer ray tracing Monte Carlo techniques. These predictions are compared with experimental measurements of actual prism light guides, with substantial agreement.
Consideration is then given to the use of a prism light guide in illuminating engineering applications. In these situations light is distributed along the length of a prism light guide, and is uniformly emitted from the surface. The performance of such a system is modelled with Monte Carlo computer ray tracing, and experimentally tested, with substantial agreement.
This study concludes with a measurement of diffraction losses. These losses were enhanced by the use of longer wavelength radiation (3mm wavelength microwaves). The results confirm that diffraction losses are small relative to other loss mechanisms.
In general, the results reported in this thesis demonstrate the existence of a useful class of light guidance structures which are particularly well suited to the requirements for distribution and transport of optical radiation for illuminating engineering applications.Science, Faculty of
Physics and Astronomy, Department of
Graduate
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Schuster, Daniel. "Bedarfsgesteuerte Verteilung von Inhaltsobjekten in Rich Media Collaboration Applications." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1196343503734-18949.
Full textAbstract:
IP-basierte Konferenz- und Kollaborations-Systeme entwickeln sich mehr und mehr in Richtung Rich Media Collaboration, d.h. vereinigen Audio- und Videokonferenzfunktionalität mit Instant Messaging und kollaborativen Funktionen wie Presentation Sharing und Application Sharing. Dabei müssen neben den Live-Medienströmen auch Inhaltsobjekte wie Präsentationsfolien oder Dokumentseiten in Echtzeit innerhalb einer Session verteilt werden. Im Gegensatz zum klassischen 1:n-push-Schema wird dafür in der Arbeit ein Ansatz für wahlfreien Zugriff auf durch die Teilnehmer selbst gehostete Inhaltsobjekte - also n:m-pull-Verteilung - vorgestellt. Dieser Ansatz hat in Anwendungsszenarien mit gleichberechtigten Teilnehmern, wie zum Beispiel virtuellen Meetings von Projektteams, signifikante Performance-Vorteile gegenüber den traditionellen Ansätzen. Mit dem Content Sharing Protocol (CSP) wurde eine Protokoll-Engine bestehend aus neun Mikroprotokollen entwickelt, implementiert und evaluiert. Sie beinhaltet neben der Kernfunktionalität der Inhaltsauslieferung auch Unterstützung für Caching, Prefetching und Datenadaption, sowie dynamische Priorisierung von Datentransfers und Interaktionsunterstützung.
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Mbah, Alfred Kubong. "On the theory of records and applications." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002216.
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Di, Stasio Pascale. "Les applications bancaires mobiles peuvent-elles fidéliser la génération Y?" Mémoire, Université de Sherbrooke, 2013. http://hdl.handle.net/11143/6090.
Full textAbstract:
Abstract: Despite an exhaustive research, very few academic papers regarding loyalty in the context of mobile banking application exist in the marketing, technologies and banking literature. However, banking corporation have launched mobile banking applications in the Quebec's market and are now interested in knowing if this new distribution channel can generate value for their new upcoming important market: The Generation Y (Gen-Y). This research aims to analyse the impact of mobile banking services on Gen Y's loyalty. An experimentation with three scenarios presenting a different banking service (online or mobile) was performed. The results show there are no significant differences between the type of services (between scenarios). Furthermore, it seems that, at the time of this investigation, loyalty was greater in the online context than on any of the remaining mobile context. This observation was consistent in all perceived value dimensions. The results of our structural equation modeling demonstrate a significant relationship between variables Under study. Therefore, depending on the choice of modelization : (1) perceived emotional value has a significant positive impact on customer satisfaction ; (2) perceived functional value - Quality - Display has a significant positive impact on customer satisfaction; (3) perceived functional value - Quality - Security has a significant positive impact on customer satisfaction; (4) perceived functional value - Quality - Control over financial matters has a significant positive impact on customer satisfaction ; (5) perceived emotional value - Familiarity has a significant positive impact on customer satisfaction and (6) customer satisfaction has a significant positive impact on customer loyalty. Given these results, it seems that marketing managers should aim to increase the perceived functional value - Quality and perceived emotional value of mobile banking services for Generation Y users. Aspects such as Display, Security, Control over Financial matters and Familiarity seems to bring value to Gen-Y. They should also segment the Gen-Yers based on their annual income and also on their level of parental dependence in order to better target this segment that could really generate behavioural loyalty.||Résumé : Malgré une recherche intensive, très peu de recherches académiques concernant la loyauté dans le contexte des applications bancaires mobiles existent dans la littérature marketing, bancaire ou des technologies. De plus, les corporations bancaires, ayant lancé des applications bancaires mobiles dans le marché Québécois, sont maintenant intéressées à savoir si ce nouveau mode de distribution génère de la valeur pour leur prochaine clientèle cible d'importance : la génération Y (Gen-Y). Cette recherche a pour but d'analyser l'impact des services bancaires mobiles sur la loyauté de la génération Y. Une expérimentation avec trois scénarios présentant différents services bancaires (Internet ou mobile) fut entreprise. Les résultats démontrent qu'il n'y a pas de différences significatives selon le type de distribution des services bancaires. Qui plus est, il semble qu'au moment de l'étude, la loyauté était plus significative dans le contexte des services bancaires en ligne que dans les contextes mobiles présentés dans les scénarios et ce, pour l'ensemble des dimensions de la valeur perçue analysées. Les résultats de notre modélisation à l'aide d'équations structurelles indiquent une relation significative entre les variables à l'étude. Ainsi, selon le modèle analysé : (1) la valeur émotionnelle perçue a un impact positif significatif sur la satisfaction du consommateur ; (2) la dimension « apparence visuelle » de la valeur fonctionnelle perçue relative à la qualité a un impact positif significatif sur la satisfaction du consommateur ; (3) la dimension « sécurité » de la valeur fonctionnelle perçue relative à la qualité a un impact positif significatif sur la satisfaction du consommateur ; (4) la dimension « contrôle des finances personnelles » de la valeur fonctionnelle perçue relative à la qualité a un impact positif significatif sur la satisfaction du consommateur ; (5) la dimension « familiarité » de la valeur émotionnelle perçue a un impact positif significatif sur la satisfaction du consommateur et (6) la satisfaction du consommateur a un impact positif significatif sur la loyauté du consommateur. Compte tenu de ces résultats, les gestionnaires marketing devraient concentrer leurs efforts sur les dimensions de la valeur fonctionnelle relatives à la qualité perçues par la génération Y lors de leur utilisation des services bancaires mobiles. Il en est de même pour les dimensions de la valeur émotionnelle perçues. Les dimensions telles que l'apparence visuelle, la sécurité, le contrôle des finances personnelles et la familiarité semblent générer de la valeur pour les Gen-Y. Les résultats suggèrent aussi de segmenter la génération Y en se basant sur leur revenu annuel ainsi que sur leur niveau de dépendance parentale afin de mieux cibler les individus de la génération Y pouvant réellement générer une loyauté comportementale.
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Fowe, Tame-kouontcho. "Pade Approximants and One of its Applications." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4139.
Full textAbstract:
This thesis is concerned with a brief summary of the theory of Pade approximants and one of its applications to Finance. Proofs of most of the theorems are omitted and many developments could not be mentioned due to the vastness of the field of Pade approximations. We provide reference to research papers and books that contain exhaustive treatment of the subject. This thesis is mainly divided into two parts. In the first part we derive a general expression of the Pade approximants and some of the results that will be related to the work on the second part of the thesis. The Aitken's method for quick convergence of series is highlighted as Pade[L/1] . We explore the criteria for convergence of a series approximated by Pade approximants and obtain its relationship to numerical analysis with the help of the Crank-Nicholson method. The second part shows how Pade approximants can be a smooth method to model the term structure of interest rates using stochastic processes and the no arbitrage argument. Pade approximants have been considered by physicists to be appropriate for approximating large classes of functions. This fact is used here to compare Pade approximants with very low indices and two parameters to interest rates variations provided by the Federal Reserve System in the United States.M.S.
Department of Mathematics
Sciences
Mathematical Science MS
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Huang, Li. "Paraffin water phase change emulsion for cold storage and distribution applications." Oberhausen Laufen, 2009. http://d-nb.info/998703575/04.
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Malo, Pekka. "Higher order moments in distribution modelling with applications to risk management /." Helsinki : Helsinki School of Economics, 2007. http://aleph.unisg.ch/hsgscan/hm00182256.pdf.
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Miladinovic, Branko. "Kernel density estimation of reliability with applications to extreme value distribution." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002760.
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Darsinos, Theofanis. "The distribution of options prices with applications to corporate contingent claims." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619718.
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Криводуб, Анна Сергіївна, Анна Сергеевна Криводуб, Anna Serhiivna Kryvodub, Євгеній Анатолійович Лавров, Евгений Анатольевич Лавров, Yevhenii Anatoliiovych Lavrov, V. Koshara, and N. Pasko. "Information Technology Distribution of Applications between Operators of the Compressor Station." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47080.
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Ergatic automated systems with many active operators are researched. The problem of choosing the optimal fixing of the man-operator for an application for execution of the function is examined. Questions the effectiveness and appropriateness of information technology have been described.
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Ding, Xiqian, and 丁茜茜. "Some new statistical methods for a class of zero-truncated discrete distributions with applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2015. http://hdl.handle.net/10722/211126.
Full textAbstract:
Counting data without zero category often occur in various _elds. Examples include days of hospital stay for patients, numbers of publication for tenure-tracked faculty in a university, numbers of tra_c violation for drivers during a certain period and so on. A class of zero-truncated discrete models such as zero-truncated Poisson, zero-truncated binomial and zero-truncated negative-binomial distributions are proposed in literature to model such count data. In this thesis, firstly, literature review is presented in Chapter 1 on a class of commonly used univariate zero-truncated discrete distributions.
In Chapter 2, a unified method is proposed to derive the distribution of the sum of i.i.d. zero-truncated distribution random variables, which has important applications in the construction of the shortest Clopper-Person confidence intervals of parameters of interest and in the calculation of the exact p-value of a two-sided test for small sample sizes in one sample problem. These problems are discussed in Section 2.4. Then a novel expectation-maximization (EM) algorithm is developed for calculating the maximum likelihood estimates (MLEs) of parameters in general zero-truncated discrete distributions. An important feature of the proposed EM algorithm is that the latent variables and the observed variables are independent, which is unusual in general EM-type algorithms. In addition, a unified minorization-maximization (MM) algorithm for obtaining the MLEs of parameters in a class of zero-truncated discrete distributions is provided.
The first objective of Chapter 3 is to propose the multivariate zero-truncated Charlier series (ZTCS) distribution by developing its important distributional properties, and providing efficient MLE methods via a novel data augmentation in the framework of the EM algorithm. Since the joint marginal distribution of any r-dimensional sub-vector of the multivariate ZTCS random vector of dimension m is an r-dimensional zero-deated Charlier series (ZDCS) distribution (1 6 r < m), it is the second objective of Chapter 3 to propose a new family of multivariate zero-adjusted Charlier series (ZACS) distributions (including the multivariate ZDCS distribution as a special member) with a more flexible correlation structure by accounting for both inflation and deflation at zero. The corresponding distributional properties are explored and the associated MLE method via EM algorithm is provided for analyzing correlated count data.published_or_final_version
Statistics and Actuarial Science
Master
Master of Philosophy
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Kiljan, Joanna. "Embedded charge for microswitch applications /." Online version of thesis, 2004. http://hdl.handle.net/1850/5199.
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Van, Nosdall Stephen Paul. "Experiments on a Hybrid Composite Beam for Bridge Applications." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23106.
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This thesis details a study of the structural behavior of Hybrid-Composite Beams (HCB) consisting of a fiber reinforced polymer (FRP) shell with a concrete arch tied with steel prestressing strands. The HCB offers advantages in life cycle costs through reduced transportation weight and increased corrosion resistance. By better understanding the system behavior, the proportion of load in each component can be determined, and each component can be designed for the appropriate forces. A long term outcome of this research will be a general structural analysis framework that can be used by DOTs to design HCBs as rapidly constructible bridge components. This study focuses on identifying the load paths and load sharing between the arch and FRP shell. Testing was performed by applying point loads on simple span beams (before placing the bridge deck) and a three beam skewed composite bridge system. Curvature from strain data is used to find internal bending forces, and the proportion of load within the arch is found. Additionally, a stress integration method is used to confirm the internal force contributions. The tied arch carries about 80% of the total load for the non-composite case without a bridge deck. When composite with a bridge deck, the arch has a minimal contribution to the HCB stiffness and strength as it is below the neutral axis. For this composite case the FRP shell and prestressing strands resist about 85% of the applied load while the bridge deck carries the remaining 15% to the end diaphragms and bearings.
Master of Science
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Achir, Nadjib. "Distribution de la vidéo multi-objets dans les réseaux hétérogènes." Paris 6, 2003. http://www.theses.fr/2003PA066499.
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Riemann, Felix [Verfasser]. "The Pointwise Product in Infinite-dimensional Distribution Spaces and Applications / Felix Riemann." München : Verlag Dr. Hut, 2015. http://d-nb.info/1077403933/34.
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Syfert, Mindy Mardean. "Species distribution modelling using presence-only data : applications in ecology and conservation." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648801.
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Barker, Jolene. "APPLICATIONS OF THE BIVARIATE GAMMA DISTRIBUTION IN NUTRITIONAL EPIDEMIOLOGY AND MEDICAL PHYSICS." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/1623.
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In this thesis the utility of a bivariate gamma distribution is explored. In the field of nutritional epidemiology a nutrition density transformation is used to reduce collinearity. This phenomenon will be shown to result due to the independent variables following a bivariate gamma model. In the field of radiation oncology paired comparison of variances is often performed. The bivariate gamma model is also appropriate for fitting correlated variances. A method for simulating bivariate gamma random variables is presented. This method is used to generate data from several bivariate gamma models and the asymptotic properties of a test statistic, suggested for the radiation oncology application, is studied.
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Desilets, Darin Maurice, and Darin Maurice Desilets. "The global distribution of secondary cosmic rays and applications to cosmogenic dating." Thesis, The University of Arizona, 2001. http://hdl.handle.net/10150/626811.
Full textAbstract:
Methods of surface exposure dating usmg terrestrial cosmogemc nuclides require
accurate knowledge of the spatial variability of nuclide production rates. The nucleon
component of the secondary cosmic-ray flux is responsible for a major fraction of terres
trial nuclide production and this component is particularly sensitive to variations in alti
tude and position in the geomagnetic field. To be applied at widely different locations,
calibrated production rates must be scaled to account for variations in cosmic-ray intensity
due to these two factors.
Current scaling models are based on a small number of nuclear emulsion and cloud
chamber measurements and data from BF3 proportional counters that are mostly limited to
altitudes above 3,000 m. Over the past 50 years, however, there have been numerous alti
tude and latitude surveys with neutron monitors as well as additional measurements with
proportional counters. These surveys not only describe more precisely how the nucleon
flux depends on altitude and geomagnetic position, but also provide valuable data on the
energy spectrum and on the effects of solar activity.
This work utilizes more recent and more extensive measurements of nucleon intensity
along with an improved understanding of cosmic-ray phenomena to derive scaling models
for thermal neutron absorption reactions and high-energy spallation reactions. Latitude
data are ordered according to effective vertical cutoff rigidity [GV] and altitude data
according to mass shielding depth [g cm2 ]. Neutron monitor data are corrected for instrumental biases and parameterized using polynomials. Attenuation lengths for thermal neutrons are greater than for high-energy neutrons by 15% at 3800 m and 14 GV, whereas the
difference at sea level is estimated to be negligible at all latitudes
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Barbosa, HÃlio de Paula. "Use of harmony search to fit Weibull distribution in wind energy applications." Universidade Federal do CearÃ, 2016. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16017.
Full textAbstract:
CoordenaÃÃo de AperfeiÃoamento de NÃvel SuperiorThe wind resource assessment is a key step in the development of wind power generation projects. Minimizing errors in this step brings significant reliability gains for the whole project. In this study we sought a reduction in the errors associated with the adjustment of the Weibull distribution with respect to data collected by an improvement of this setting. With this purpose, it was applied the optimization algorithm of Harmonic Search (HS) to find the Weibull distribution parameters with the best fit. The HS was used to find the Weibull distribution parameters for two sets of data from the Sistema de OrganizaÃÃo de Dados Ambientais (SONDA) of the cities of Petrolina-PE and SÃo Martinho da Serra-RS. The parameters of the HS were selected by two methods, one being a result of the novel combination of two other already presented in the literature. We therefore compared the errors for each one to determine which method provides better optimization. For evaluating the quality setting, the root mean square error (RMSE) and the correlation coefficient were used. The HS-PA method uses a selection of random parameters but, results showed more stable than the IHS. It was found for the IHS method one RMSE = 0.006418 for Petrolina and RMSE = 0.008303 for SÃo Martinho da Serra. The HS-PA method presented a RMSE = 0.006419 for Petrolina and RMSE = 0.008303 for SÃo Martinho da Serra. The RMSE values for the traditional methods applied to the same data set, there were two or more times greater than those found by employing the Harmonic search.
A anÃlise de recurso eÃlico à uma etapa fundamental no desenvolvimento de projetos de geraÃÃo de energia eÃlica. A minimizaÃÃo dos erros nesta etapa traz ganhos significativos de confiabilidade para o projeto como um todo. Neste trabalho foi buscada uma diminuiÃÃo dos erros associados ao ajuste da distribuiÃÃo de Weibull em relaÃÃo aos dados coletados atravÃs de uma melhora deste ajuste. Visando tal intento, foi aplicado o algoritmo de otimizaÃÃo da Busca HarmÃnica (HS) para encontrar os parÃmetros da distribuiÃÃo de Weibull com o melhor ajuste. A HS foi utilizada para encontrar os parÃmetros da distribuiÃÃo de Weibull para dois conjuntos de dados provenientes do Sistema de OrganizaÃÃo de Dados ambientais (SONDA) das cidades de Petrolina-PE e SÃo Martinho da Serra-RS. Os parÃmetros da HS foram selecionados atravÃs de duas metodologias, sendo uma delas inovadora por resultar da combinaÃÃo de outras duas jà apresentadas anteriormente em literatura. Foram, portanto, comparados os erros referentes a cada uma para determinar qual mÃtodo fornecia uma melhor otimizaÃÃo. Para a avaliaÃÃo da qualidade do ajuste, foram utilizados o erro mÃdio quadrÃtico (RMSE) e o coeficiente de correlaÃÃo. O mÃtodo HS-PA, embora utilize uma seleÃÃo de parÃmetros aleatÃria, apresentou resultados mais estÃveis do que o IHS. Foi encontrado para o mÃtodo IHS um RMSE = 0,006418 para Petrolina e RMSE = 0,008303 para SÃo Martinho da Serra. O mÃtodo HS-PA apresentou um RMSE = 0,006419 para Petrolina e RMSE = 0,008303 para SÃo Martinho da Serra. Os valores de RMSE para os mÃtodos tradicionais aplicados ao mesmo conjunto de dados, foram duas ou mais vezes maiores do que os encontrados, empregando a Busca HarmÃnica.
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Kurt, Ozan Ekin. "Post-Keynesian models of income distribution and growth : applications to developing countries." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCD068.
Full textAbstract:
Le but de cette thèse est d’analyser les effets de court terme de la répartitionfonctionnelle des revenus sur la demande agrégée et ses composants en Corée du Sud,Thaïlande et la Chine dans un cadre postkeynésien. Dans ce but un modèle est proposé etses paramètres sont estimés pour caractériser les régimes de croissance de demande dansces pays. L’analyse économétrique montre que les demandes domestiques de ces payssont tirées par les salaires, sauf Thaïlande dans lequel certaines mesures de la répartitiondes revenus indiquent que l’économie domestique est tirée par les profits, pendant que leséconomies ouvertes sont tirées par les profits. Les résultats décrivent que des politiquesde croissance pro-travaillistes ne sont pas viables au court terme dans ces pays. Cettethèse comprend une revue de la littérature sur les théories de répartition des revenus et decroissance, présente une revue de la littérature sur les travaux empiriques de modèlespostkeynésiennes de croissance et répartition, expose un modèle théorique, elle comprendégalement une analyse du régime de croissance de demande en Corée du Sud, Thaïlandeet la Chine, respectivement. Dernièrement, la thèse discute les défauts du modèle, résumeses résultats et arrive à des conclusions politiques impliquées par le modèleThe aim of this PhD dissertation is to analyze the short-term impact offunctional income distribution on aggregate demand and its components in South Korea,Thailand, and China within a post-Keynesian framework. For this purpose, thedissertation proposes a theoretical model, and estimates its parameters for characterizingdemand regimes in these countries. Econometric analysis shows that domestic economiesof the countries are wage-led except for Thailand, in which some measures of incomedistribution point to a profit-led domestic demand regime, while total economies areprofit-led. The results indicate that pro-labor growth policies are not viable in the shortrun in these countries. The dissertation reviews the theories of income distribution andgrowth, offers a survey of the empirical literature on the post-Keynesian models ofincome distribution and growth, presents the theoretical model proposed, and undertakesan analysis of demand regimes in South Korea, Thailand, and China. Finally, thedissertation addresses the shortcomings of the model, summarizes its findings discussesthe implied policy conclusions