Дисертації з теми "Discontinuous Function"
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Costin, William James. "Radial basis function interpolation applied to discontinuous mesh interfaces." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.653069.
Повний текст джерелаDubois, Olivier 1980. "Optimized Schwarz methods for the advection-diffusion equation and for problems with discontinuous coefficients." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103379.
Повний текст джерелаIn the first part of this work, we continue the study of optimized transmission conditions for advection-diffusion problems with smooth coefficients. We derive asymptotic formulas for the optimized parameters for small mesh sizes, in the overlapping and non-overlapping cases, and show that these formulas are accurate when the component of the advection tangential to the interface is not too large.
In a second part, we consider a diffusion problem with a discontinuous coefficient and non-overlapping domain decompositions. We derive several choices of optimized transmission conditions by thoroughly solving the associated min-max problems. We show in particular that the convergence of optimized Schwarz methods improves as the jump in the coefficient increases, if an appropriate scaling of the transmission conditions is used. Moreover, we prove that optimized two-sided Robin conditions lead to mesh-independent convergence. Numerical experiments with two subdomains are presented to verify the analysis. We also report the results of experiments using the decomposition of a rectangle into many vertical strips; some additional analysis is carried out to improve the optimized transmission conditions in that case.
On a third topic, we experiment with different coarse space corrections for the Schwarz method in a simple one-dimensional setting, for both overlapping and non-overlapping subdomains. The goal is to obtain a convergence that does not deteriorate as we increase the number of subdomains. We design a coarse space correction for the Schwarz method with Robin transmission conditions by considering an augmented linear system, which avoids merging the local approximations in overlapping regions. With numerical experiments, we demonstrate that the best Robin conditions are very different for the Schwarz iteration with, and without coarse correction.
COLOMBO, Alessandro (ORCID:0000-0002-6527-8148). "An agglomeration-based discontinuous Galerkin method for compressible flows." Doctoral thesis, Università degli studi di Bergamo, 2011. http://hdl.handle.net/10446/222124.
Повний текст джерелаLi, Tianyu. "On the Formulation of a Hybrid Discontinuous Galerkin Finite Element Method (DG-FEM) for Multi-layered Shell Structures." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/82962.
Повний текст джерелаMaster of Science
Mello, João Paulo Ferreira de. "Funções de Melnikov para classes de sistemas descontínuos no plano." reponame:Repositório Institucional da UFABC, 2015.
Знайти повний текст джерелаDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Matemática , 2015.
Neste trabalho estudamos generalizações do Método de Melnikov para sistemas descontínuos no plano. Neste sentido, inicialmente abordamos esse problema como uma variação do estudo [1] onde um campo Hamiltoniano que admite um ciclo heteroclínico, cujo interior é folheado de órbitas periódicas, é perturbado por um campo Hamiltoniano não autonomo. Neste trabalho estendemos esse resultado para perturbações mais gerais (não conservativas) e apresentamos funções de Melnikov nesse novo contexto. Finalmente, abordamos o problema mais geral, relativo à perturbação de campos não conservativos, onde a função de Melnikov, associada a órbita heteroclínica, é obtida.
In this work we study generalizations of Melnikov's method to planar discontinuous dynamical system. Initially we study this problem as a variation of the work [1] where a Hamiltonian vector field that admits an heteroclinic cycle with its interior foliated by a family of periodic orbits is perturbed by a Hamiltonian perturbation. In this work we extended the results to more general perturbation (non conservative) and we show the Melnikov's functions in this new context. Finally, we approach a more general problem related to a perturbation of the non-conservative vector field where we obtained the Melnikov's function that is associated with a heteroclínic orbit.
Santos, Iguer Luis Domini dos [UNESP]. "Análise de estabilidade de sistemas dinâmicos descontínuos e aplicações." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/94290.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Neste trabalho introduzimos uma classe de sistemas dinâmicos descontínuos com espaço tempo contínuo e analisamos Teoremas que asseguram condições suficientes para a estabilidade de Lyapunov utilizando funções de Lyapunov. Além disso, consideramos também Teoremas de Recíproca, que sob algumas condições garantem uma determinada necessidade para esses Teoremas de estabilidade de Lyapunov.
In this work we introduce a class of discontinuous dynamical systems with time space continuous and we analyze Theorems that ensure sufficient conditions for the Lyapunov stability using Lyapunov functions. Moreover, we also consider Converse Theorems, which under some conditions guarantee a determined necessity for those Theorems of Lyapunov stability.
Denniston, Jeffrey T. "A Study of Subsystems of Topological Systems Motivated by the Question of Discontinuity in TopSys." Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1497095905660085.
Повний текст джерелаWei, Jiangong. "Surface Integral Equation Methods for Multi-Scale and Wideband Problems." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408653442.
Повний текст джерелаHe, Taiping. "Reaction-Diffusion Systems with Discontinuous Reaction Functions." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-03192005-101102/.
Повний текст джерелаDíaz, Lolimar, and Raúl Naulin. "A set of almost periodic discontinuous functions." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/95357.
Повний текст джерелаLiu, Guangwu. "Pathwise sensitivity estimation for expectations of discontinuous functions /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?IELM%202009%20LIU.
Повний текст джерелаTurski, Jacek. "Calculus of variations for discontinous fields and its applications to selected topics in continuum mechanics." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72804.
Повний текст джерелаMukhamedov, Farukh. "High performance computing for the discontinuous Galerkin methods." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/16769.
Повний текст джерелаGorodetsky, Alex Arkady. "A learning method for the approximation of discontinuous functions for stochastic simulations." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76101.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 79-83).
Surrogate models for computational simulations are inexpensive input-output approximations that allow expensive analyses, such as the forward propagation of uncertainty and Bayesian statistical inference, to be performed efficiently. When a simulation output does not depend smoothly on its inputs, however, most existing surrogate construction methodologies yield large errors and slow convergence rates. This thesis develops a new methodology for approximating simulation outputs that depend discontinuously on input parameters. Our approach focuses on piecewise smooth outputs and involves two stages: first, efficient detection and localization of discontinuities in high-dimensional parameter spaces using polynomial annihilation, support vector machine classification, and uncertainty sampling; second, approximation of the output on each region using Gaussian process regression. The discontinuity detection methodology is illustrated on examples of up to 11 dimensions, including algebraic models and ODE systems, demonstrating improved scaling and efficiency over other methods found in the literature. Finally, the complete surrogate construction approach is demonstrated on two physical models exhibiting canonical discontinuities: shock formation in Burgers' equation and autoignition in hydrogen-oxygen combustion.
by Alex Arkady Gorodetsky.
S.M.
Shlapunov, Alexander, and Nikolai Tarkhanov. "On completeness of root functions of Sturm-Liouville problems with discontinuous boundary operators." Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/5775/.
Повний текст джерелаGioev, Dimitri. "Generalizations of Szego Limit Theorem : Higher Order Terms and Discontinuous Symbols." Doctoral thesis, KTH, Mathematics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3123.
Повний текст джерелаSantos, Iguer Luis Domini dos. "Análise de estabilidade de sistemas dinâmicos descontínuos e aplicações /." São José do Rio Preto : [s.n.], 2008. http://hdl.handle.net/11449/94290.
Повний текст джерелаAbstract: In this work we introduce a class of discontinuous dynamical systems with time space continuous and we analyze Theorems that ensure sufficient conditions for the Lyapunov stability using Lyapunov functions. Moreover, we also consider Converse Theorems, which under some conditions guarantee a determined necessity for those Theorems of Lyapunov stability.
Orientador: Geraldo Nunes Silva
Coorientador: Luis Antônio Fernandes de Oliveira
Banca: Luis Antônio Barrera San Martin
Banca: Adalberto Spezamiglio
Mestre
Маслов, Олександр Петрович, Александр Петрович Маслов, Oleksandr Petrovych Maslov та М. К. Супруненко. "Чисельне дослідження наближення розривних функцій". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65560.
Повний текст джерелаChilton, Ryan Austin. "H-, P- and T-Refinement Strategies for the Finite-Difference-Time-Domain (FDTD) Method Developed via Finite-Element (FE) Principles." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1219064270.
Повний текст джерелаBahroun, Sami. "Modélisation et approche thermodynamique pour la commande des réacteurs chimiques catalytiques triphasiques continus et discontinus." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00720906.
Повний текст джерелаFerrer, Esteban. "A high order Discontinuous Galerkin - Fourier incompressible 3D Navier-Stokes solver with rotating sliding meshes for simulating cross-flow turbines." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:db8fe6e3-25d0-4f6a-be1b-6cde7832296d.
Повний текст джерелаGunaydin, Zekiye. "Analysis And Design Of A Cuk Switching Regulator." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610606/index.pdf.
Повний текст джерелаPena, Ismael da Silva. "Análise de estabilidade de sistemas dinâmicos híbridos e descontínuos modelados por semigrupos /." São José do Rio Preto : [s.n.], 2008. http://hdl.handle.net/11449/94205.
Повний текст джерелаAbstract: Hybrid dynamical systems are characterized for showing simultaneously a variety of dynamic behaviors (continuous, discrete, discrete events) in different parts of the System. This work discusses stability results in the Lyapunov sense for general hybrid dynamical systems that use a generalized notion of time, defined in a completely ordered metric space. It has been shown that these systems may be immersed in discontinuous dynamical systems defined in R+, so that their quality properties are preserved. As the main focus, it is studied stability results for discontinuous dynamical systems modeled by semigroup operators, in which the states belong to Banach spaces. In this case, an alternative to the classical theory of stability, the results do not make use of the usual Lyapunov functions, and therefore are easier to apply, in view of the difficulty in finding such functions for many systems. Furthermore, the results were applied to a class of time-delay discontinuous differential equations.
Orientador: Geraldo Nunes Silva
Coorientador: Luís Antônio Fernandes de Oliveira
Banca: Carlos Alberto Raposo da Cunha
Banca: Waldemar Donizete Bastos
Mestre
Pena, Ismael da Silva [UNESP]. "Análise de estabilidade de sistemas dinâmicos híbridos e descontínuos modelados por semigrupos:." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/94205.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Sistemas dinâmicos híbridos se diferenciam por exibir simultaneamente variados tipos de comportamento dinâmico (contínuo, discreto, eventos discretos) em diferentes partes do sistema. Neste trabalho foram estudados resultados de estabilidade no sentido de Lyapunov para sistemas dinâmicos híbridos gerais, que utilizam uma noção de tempo generalizado, definido em um espaço métrico totalmente ordenado. Mostrou-se que estes sistemas podem ser imersos em sistemas dinâmicos descontínuos definidos em R+, de forma que sejam preservadas suas propriedades qualitativas. Como foco principal, estudou-se resultados de estabilidade para sistemas dinâmicos descontínuos modelados por semigrupos de operadores, em que os estados do sistema pertencem à espaços de Banach. Neste caso, de forma alternativa à teoria clássica de estabilidade, os resultados não utilizam as usuais funções de Lyapunov, sendo portanto mais fáceis de se aplicar, tendo em vista a dificuldade em se encontrar tais funções para muitos sistemas. Além disso, os resultados foram aplicados à uma classe de equações diferenciais com retardo.
Hybrid dynamical systems are characterized for showing simultaneously a variety of dynamic behaviors (continuous, discrete, discrete events) in different parts of the System. This work discusses stability results in the Lyapunov sense for general hybrid dynamical systems that use a generalized notion of time, defined in a completely ordered metric space. It has been shown that these systems may be immersed in discontinuous dynamical systems defined in R+, so that their quality properties are preserved. As the main focus, it is studied stability results for discontinuous dynamical systems modeled by semigroup operators, in which the states belong to Banach spaces. In this case, an alternative to the classical theory of stability, the results do not make use of the usual Lyapunov functions, and therefore are easier to apply, in view of the difficulty in finding such functions for many systems. Furthermore, the results were applied to a class of time-delay discontinuous differential equations.
Gdhami, Asma. "Méthodes isogéométriques pour les équations aux dérivées partielles hyperboliques." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4210/document.
Повний текст джерелаIsogeometric Analysis (IGA) is a modern strategy for numerical solution of partial differential equations, originally proposed by Thomas Hughes, Austin Cottrell and Yuri Bazilevs in 2005. This discretization technique is a generalization of classical finite element analysis (FEA), designed to integrate Computer Aided Design (CAD) and FEA, to close the gap between the geometrical description and the analysis of engineering problems. This is achieved by using B-splines or non-uniform rational B-splines (NURBS), for the description of geometries as well as for the representation of unknown solution fields.The purpose of this thesis is to study isogeometric methods in the context of hyperbolic problems usingB-splines as basis functions. We also propose a method that combines IGA with the discontinuous Galerkin(DG)method for solving hyperbolic problems. More precisely, DG methodology is adopted across the patchinterfaces, while the traditional IGA is employed within each patch. The proposed method takes advantageof both IGA and the DG method.Numerical results are presented up to polynomial order p= 4 both for a continuous and discontinuousGalerkin method. These numerical results are compared for a range of problems of increasing complexity,in 1D and 2D
Estecahandy, Elodie. "Contribution à l'analyse mathématique et à la résolution numérique d'un problème inverse de scattering élasto-acoustique." Phd thesis, Université de Pau et des Pays de l'Adour, 2013. http://tel.archives-ouvertes.fr/tel-00880628.
Повний текст джерелаLin, C. I., and 林敬穎. "Application of Describing Function to Estimate the Continuous and Discontinuous Conduction Mode for Converter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/66567995772049872346.
Повний текст джерела逢甲大學
自動控制工程學系
89
For a dc-to-dc buck converter , the performance of the conductor is significantly different for the converter operating on the continuous conduction mode (CCM) or discontinuous conduction mode (DCM). In this paper, we address the operating condition on the CCM and DCM for a saturated inductor. I will show that the inductor plays a essential role for the converter operating on the CCM and DCM. It is known that when the load is large, the inductance for the inductor always changes. This is due to the fact that when the current load is large, the inductance always suffer from saturation or hysteresis. Because the inductance is nonlinear, it is very difficult to estimate the actual value for the nonlinear inductance during large current situations. With the dual-input describing function method, we can linearize the nonlinear inductor and then estimate the inductance during the large current situations. It can be shown that when the inductance of the inductor is saturated, the operating region of discontinuous conduction mode (DCM) of the buck converter will extent drastically, which means the converter will easily operate in the discontinuous conduction mode. A experimental example will verified these results.
Wang, Shih-cheng, and 王士誠. "Iterative Learning Control of MIMO Linear System under Control Constraint Based on Sign Function for Discontinuous References." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/45594403388687885096.
Повний текст джерела國立成功大學
電機工程學系碩博士班
96
In view of the optimal control whose control input signal is very large in the thesis, we present a sign function algorithm based on the foundation of optimal control using linear quadratic regulator and high gain property to get an input saturation value, and supplies a good tracking performance. Then, take this good control input to be as first iteration of open loop iterative learning controller, it can get as well as performance in the first training iteration, and supplies a good tracking performance in both the transient and steady-state phase. Moreover, the method improves convergence and input saturation value in traditional iteration learning control. Besides, we present a method to overcome discontinuous and non-differentiable function in iterative learning control update rule, using Taylor series expansion to approach a correct value. Finally, MIMO numerical example is given to illustrate the effectiveness and the feasibility of the proposed method.
Liao, Cheng-Mao, and 廖承茂. "Estimation of Discontinuous Regression Functions." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/15501520624699844067.
Повний текст джерела"On the discontinuity of the Shannon information measures and typical sequences." Thesis, 2006. http://library.cuhk.edu.hk/record=b6074290.
Повний текст джерелаFor two probability distributions with finite alphabets, some bounds on the difference of their entropies as a function of their alphabet sizes and variational distance are obtained. These bounds, which are tighter than some existing results, show that entropy estimation by finite alphabet approximation may not work as we expected. On the other hand, we show that there always exists a finite alphabet approximation that works for entropy estimation provided that the alphabet used is sufficiently large. Some necessary and sufficient conditions under which the entropy of a sequence of probability distributions converges are given in terms of four new information divergence measures, where the square root of two of them are metrics.
In information theory, weak typicality and strong typicality are essential tools for proving coding theorems. Strong typicality, which is more powerful than weak typicality, can be applied to finite alphabet only, while weak typicality can be applied to both finite and countably infinite alphabets. We introduce a unified typicality for finite or countably infinite alphabet which is stronger than both weak typicality and strong typicality. With this unified typicality, the asymptotic equipartition property and the structural properties of strong typicality are preserved.
The Shannon information measures are well known to be continuous functions of the probability distribution for finite alphabet. In this thesis, however, we show that these measures are discontinuous with respect to almost all commonly used "distance" measures when the alphabet is countably infinite. Such "distance" measures include the Kullback-Leibler divergence and the variational distance. Specifically, we show that all the Shannon information measures are in fact discontinuous at all probability distributions.
Ho Siu Wai.
"August 2006."
Adviser: Wai Ho Raymond Yeung.
Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1824.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2006.
Includes bibliographical references (p. 121-123).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.
Hsu, Chen-Ming, and 許振銘. "WildSpan : Discovery of Discontinuous Functional Motifs from Protein Sequences." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/75922920449230580109.
Повний текст джерела元智大學
資訊工程學系
95
As more and more protein sequences is increasing exponentially with their structures undetermined, recognizing functional signatures directly from sequences is particularly desirable in functional proteomics. Automatic extraction of motifs from biological sequences is one of central problems in molecular biology. For proteins, identifying sequence motifs that contain large irregular gaps is important as the contact residues that are associated with a functional site are not always from one region of the sequence. Discovering such patterns is time-consuming because a large number of combinations exist when large and flexible wildcards (gaps) are considered. To tackle the efficiency issue, mining algorithms often employ constraints to narrow down the search space and thus increase efficiency. However, improper constraint models degrade the sensitivity and specificity of the algorithms. Designing efficient and effective algorithms to discover discontinuous functional motifs is the theme of this dissertation. In this dissertation we propose a new constraint model and accordingly design a novel algorithm, WildSpan, to efficiently and effectively handle wide-range flexible-width wildcard regions. WildSpan employs a number of pruning strategies during pattern (motif) search, and ensures that only compactly representative patterns (closed patterns) are reported. The experimental results reveal that WildSpan is efficient and effective in discovering functional signatures of proteins directly from sequences. Furthermore, the idea of WildSpan was realized on the web server MAGIIC-PRO to provide an easy-to-use environment in that the users can easily collect training data and the derived patterns can be examined through several well-developed facilities.
Hsu, Mong-Da, and 徐孟達. "Effects of Continuous and Discontinuous Running Exercise on Cortisol and Immune Functions." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/34773145727411521655.
Повний текст джерела國立臺灣師範大學
體育研究所
90
Purpose: The purpose of this study was to examine the effects of continuous and discontinuous running exercise on cortisol and immune functions. Method: Thirty university male students (age=20.80±1.49 years, VO2max values=44.57±6.23 ml/min-1.kg-1) were recruited as the subjects for this study. They were divided into three different groups according to VO2max values: continuous exercise group (CEG), discontinuous exercise group (DEG) and control group (CG). The CEG performed single bout of treadmill exercise lasting 30 minutes at 70% VO2R at 13:00 (3 times/wk, 1wk). The DEG performed two bouts of treadmill exercise lasting 15 minutes at 70% VO2R at 9:00 and 13:15 (3 times/wk, 1wk). Blood samples were collected at rest before exercise, 0 hour, 2 hours and 24 hours after exercise. Cortisol, leucocyte count, neutrophil count, lymphocyte count, peripheral mononuclear cell (PMNC) proliferation, and cytokines were measured. Data were analyzed using mixed design two-way ANOVA and repeated one-way ANOVA. Results: 1) Circadian rhythm could influence cortisol concentration significantly, but there was no difference on cortisol between each group. 2) Leucocyte count, neutrophil count, lymphocyte count of CEG were significantly higher, but PMNC proliferation was lower (p< .05) at 0 hour after exercise than the DEG and CG. 2) Neutrophil count of CEG was still higher, but lymphocyte count was lower (p< .05) at 2 hours after exercise than the other groups. 3) There was no difference on cytokines between each group. Conclusions: Circadian rhythm could influence cortisol concentration significantly. During the whole period of testing, the lymphocyte count and PMNC proliferation of CEG were lower within two hours after exercise and may temporarily depress the subjects’ immune function. However, the subjects of DEG and CG didn’t show any depression of the immune variables after exercise.
Jakeman, John Davis. "Numerical methods for the quantification of uncertainty in discontinuous functions of high dimension." Phd thesis, 2011. http://hdl.handle.net/1885/150999.
Повний текст джерелаBramwell, Jamie Ann. "A discontinuous Petrov-Galerkin method for seismic tomography problems." 2013. http://hdl.handle.net/2152/21979.
Повний текст джерелаtext
Balázsová, Monika. "Některé aspekty nespojité Galerkinovy metody pro řešení konvektivně-difuzních problémů." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-321440.
Повний текст джерелаЛитвин, О. М., О. Г. Литвин, and О. О. Литвин. "Method of Calculating Fourier Coefficients of Three Variable Functions Using Tomogram." Thesis, 2019. http://openarchive.nure.ua/handle/document/9457.
Повний текст джерелаChan, Jesse L. "A DPG method for convection-diffusion problems." 2013. http://hdl.handle.net/2152/21417.
Повний текст джерелаtext