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Dissertations / Theses on the topic 'Theory and Models'

Author: Grafiati

Published: 10 March 2023

Last updated: 31 July 2025

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1

Calhoun, Grayson Ford. "Limit theory for overfit models." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3359804.

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Thesis (Ph. D.)--University of California, San Diego, 2009.<br>Title from first page of PDF file (viewed July 23, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 104-109).

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2

McCloud, Nadine. "Model misspecification theory and applications /." Diss., Online access via UMI:, 2008.

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3

Elgueta, Montó Raimon. "Algebraic model theory for languages without equality." Doctoral thesis, Universitat de Barcelona, 1994. http://hdl.handle.net/10803/21799.

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In our opinion, it is fair to distinguish two separate branches in the origins of model theory. The first one, the model theory of first-order logic, can be traced back to the pioneering work of L. Lowenheim, T. Skolem, K. Gödel, A. Tarski and A.I. MaI 'cev, published before the mid 30's. This branch was put forward during the 40s' and 50s’ by several authors, including A. Tarski, L. Henkin, A. Robinson, J. Los. Their contribution, however, was rather influenced by modern algebra, a discipline whose development was being truly fast at the time. Largely due to this influence, it was a very comm

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4

Toribio, Sherwin G. "Bayesian Model Checking Strategies for Dichotomous Item Response Theory Models." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1150425606.

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5

Arnold, Wolfram Till. "Theory of electron localization in disordered systems /." view abstract or download file of text, 2000. http://wwwlib.umi.com/cr/uoregon/fullcit?p9986736.

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Thesis (Ph. D.)--University of Oregon, 2000.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 199-204). Also available for download via the World Wide Web; free to UO users.

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6

von, Glehn Tamara. "Polynomials and models of type theory." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/254394.

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This thesis studies the structure of categories of polynomials, the diagrams that represent polynomial functors. Specifically, we construct new models of intensional dependent type theory based on these categories. Firstly, we formalize the conceptual viewpoint that polynomials are built out of sums and products. Polynomial functors make sense in a category when there exist pseudomonads freely adding indexed sums and products to fibrations over the category, and a category of polynomials is obtained by adding sums to the opposite of the codomain fibration. A fibration with sums and products is

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7

Paraskevopoulos, Ioannis. "Econometric models applied to production theory." Thesis, Queen Mary, University of London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392498.

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8

Bolton, Colin. "Models of nucleation : theory and application." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403959.

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9

Corner, Ann-Marie. "Circumplex models : theory, methodology and practice." Thesis, University of Exeter, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356997.

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10

Boulier, Simon Pierre. "Extending type theory with syntactic models." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2018. http://www.theses.fr/2018IMTA0110/document.

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Cette thèse s'intéresse à la métathéorie de la théorie des types intuitionniste. Les systèmes que nous considérons sont des variantes de la théorie des types de Martin-Löf ou du Calcul des Constructions, et nous nous intéressons à la cohérence de ces systèmes ou encore à l'indépendance d'axiomes par rapport à ces systèmes. Le fil rouge de cette thèse est la construction de modèles syntaxiques, qui sont des modèles qui réutilisent la théorie des types pour interpréter la théorie des types. Dans une première partie, nous introduisons la théorie des types à l'aide d'un système minimal et de plusi

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11

Moss, Sean. "The dialectica models of type theory." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/280672.

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This thesis studies some constructions for building new models of Martin-Löf type theory out of old. We refer to the main techniques as gluing and idempotent splitting. For each we give general conditions under which type constructors exist in the resulting model. These techniques are used to construct some examples of Dialectica models of type theory. The name is chosen by analogy with de Paiva's Dialectica categories, which semantically embody Gödel's Dialectica functional interpretation and its variants. This continues a programme initiated by von Glehn with the construction of the polyno

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12

Dotti, V. "Multidimensional voting models : theory and applications." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1516004/.

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In this thesis I study how electoral competition shapes the public policies implemented by democratic countries. In particular, I analyse the relationship between observable characteristics of the population of voters, such as the distribution of income and age, and relevant public policy outcomes of the political process. I focus on two theoretical issues that have proved difficult to tackle with existing voting models, namely multidimensionality of the policy space and non-convexity of voter preferences. I propose a new theoretical framework to deal with these issues. I employ this new frame

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13

Landgren, Filip. "Minimal Models in Conformal Field Theory." Thesis, Uppsala universitet, Teoretisk fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-416402.

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The following article reviews minimal models in conformal field theory (CFT). A two-dimensional CFT has an infinite-dimensional symmetry algebra allowing the theory to be solved exactly with operator product expansions (OPE)s. Minimal models are examples of these that are constructed from unitarity and have a finite number of primary fields. Different minimal models correspond to different twodimensional statistical models as the conformal weights of primary fields correspond to the critical exponents. We will derive the differential equations for the correlation functions of the primary field

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14

Han, Lin. "Graph generative models from information theory." Thesis, University of York, 2012. http://etheses.whiterose.ac.uk/3726/.

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Generative models are commonly used in statistical pattern recognition to describe the probability distributions of patterns in a vector space. In recent years, sustained by the wide range of mathematical tools available in vector space, many algorithms for constructing generative models have been developed. Compared with the advanced development of the generative model for vectors, the development of a generative model for graphs has had less progress. In this thesis, we aim to solve the problem of constructing the generative model for graphs using information theory. Given a set of sample gr

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15

Bianchi, Lorenzo. "Perturbation theory for string sigma models." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17439.

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In dieser Arbeit untersuchen wir Quanten-Aspekte des Green-Schwarz Superstrings in verschiedenen AdS-Hintergründen, die für die AdS/CFT Korrespondenz von Bedeutung sind, und geben einige Beispiele für perturbative Rechnungen in den entsprechenden integrablen Sigma-Modellen. Wir beginnen mit einer detaillierten Darstellung der Konstruktion der Wirkung des Typ-IIB-Superstrings auf dem AdS5 x S5-Hintergrund, die durch eine Supercoset-Sigma-Modell definiert wird, und zeigen die Grenzen dieser Herangehensweise für Hintergründe auf, die in niedrig-dimensionalen Beispielen der Eich/Gravitations-Duali

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16

Bernardo, Heliudson de Oliveira. "Cosmological models from string theory setups /." São Paulo, 2019. http://hdl.handle.net/11449/183612.

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Orientador: Horatiu Nastase<br>Resumo: Nesta tese, discutimos três modelos cosmológicos que são baseados direta ou indiretamente em ideias advindas de teoria das cordas. Depois de uma revisão geral de cosmologia em teoria das cordas, um resumo de cosmologia e teoria das cordas é apresentado, com ênfase nos conceitos fundamentais e teóricos. Então descrevemos como o acoplamento camaleônico pode potencialmente afetar as predições de inflação cósmica com campo único, com tratamento cuidadoso dos modos de perturbação cosmológica adiabáticos e de entropia. Além disso uma nova abordagem para a duali

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17

Dotti, Valerio. "Multidimensional voting models: theory and applications." Doctoral thesis, UCL Discovery, 2016. http://hdl.handle.net/10278/3742614.

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In this thesis I study how electoral competition shapes the public policies implemented by democratic countries. In particular, I analyse the relationship between observable characteristics of the population of voters, such as the distribution of income and age, and relevant public policy outcomes of the political process. I focus on two theoretical issues that have proved difficult to tackle with existing voting models, namely multidimensionality of the policy space and non-convexity of voter preferences. I propose a new theoretical framework to deal with these issues. I employ this new frame

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18

Godazgar, Mohammad Hadi. "Dualities in string theory." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610466.

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19

Blair, Christopher David Andrew. "Duality and extended geometry in string theory and M-theory." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709364.

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20

Caccavano, Adam. "Optics and Spectroscopy in Massive Electrodynamic Theory." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1485.

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The kinematics and dynamics for plane wave optics are derived for a massive electrodynamic field by utilizing Proca's theory. Atomic spectroscopy is also examined, with the focus on the 21 cm radiation due to the hyperfine structure of hydrogen. The modifications to Snell's Law, the Fresnel formulas, and the 21 cm radiation are shown to reduce to the familiar expressions in the limit of zero photon mass.

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21

Mercer, Karl John. "Identification of signal distortion models." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308356.

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22

Stuk, Stephen Paul. "Multivariable systems theory for Lanchester type models." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/24171.

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23

Holan, Scott Harold. "Time series exponential models: theory and methods." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/431.

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The exponential model of Bloomfield (1973) is becoming increasingly important due to its recent applications to long memory time series. However, this model has received little consideration in the context of short memory time series. Furthermore, there has been very little attempt at using the EXP model as a model to analyze observed time series data. This dissertation research is largely focused on developing new methods to improve the utility and robustness of the EXP model. Specifically, a new nonparametric method of parameter estimation is developed using wavelets. The advantage of this

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24

Cheung, Elliot. "Birational models of geometric invariant theory quotients." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61278.

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In this thesis, we study the problem of finding birational models of projective G-varieties with tame stabilizers. This is done with linearizations, so that each birational model may be considered as a (modular) compactification of an orbit space (of properly stable points). The main portion of the thesis is a re-working of a result in Kirwan's paper "Partial Desingularisations of Quotients of Nonsingular Varieties and their Betti Numbers", written in a purely algebro-geometric language. As such, the proofs are novel and require the Luna Slice Theorem as their primary tool. Chapter 1 is de

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25

Weston, Robert Andrew. "Lattice field theory and statistical-mechanical models." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315971.

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26

Schwarz, Maike [Verfasser]. "Stochastic Models in Inventory Theory / Maike Schwarz." Aachen : Shaker, 2004. http://d-nb.info/1172610304/34.

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27

LaÌzaÌr, Emese. "Multi-state volatility models : theory and applications." Thesis, University of Reading, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434314.

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28

Bozek, Krzysztof. "Particle phenomenology from M theory inspired models." Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/particle-phenomenology-from-m-theory-inspired-models(f03bc0dc-3bda-4c6d-b3dc-dc4360f3f67b).html.

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This thesis focuses on low-energy particle phenomenology arising from G2 compactifications of M theory. We construct a supersymmetric SO(10) model that can be naturally realised in this framework. An appropriate discrete symmetry combined with a symmetry breaking Wilson line suppresses the μ-term and dangerous triplet–matter interactions at the compactification scale. Stabilised moduli introduce back the forbidden terms providing the μ-term with the phenomenologically expected value of O(TeV). In our model triplets are light and regenerated triplet interactions induce proton decay but safely w

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29

Sloan, Robert Hal. "Computational learning theory : new models and algorithms." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/38339.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.<br>Includes bibliographical references (leaves 116-120).<br>by Robert Hal Sloan.<br>Ph.D.

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30

Stratton, Robert James. "Automated theory selection using agent based models." Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/automated-theory-selection-using-agent-based-models(99e5b6ac-0134-4097-956a-05394e84d575).html.

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Models are used as a tool for theory induction and decision making in many contexts, including complex and dynamic commercial environments. New technological and social developments — such as the increasing availability of real-time transactional data and the rising use of online social networks — create a trend towards modelling process automation, and a demand for models that can help decision making in the context of social interaction in the target process. There is often no obvious specification for the form that a particular model should take, and some kind of selection procedure is nece

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31

Mazzoli, Mattia. "Human mobility: data analysis, theory and models." Doctoral thesis, Universitat de les Illes Balears, 2021. http://hdl.handle.net/10803/673530.

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[eng] Like Columbus mistook America for India, we stepped into the era of misinformation mistaking it for the era of big data. Since the digital revolution in the early ’90s we started producing such a huge amount of data that we do not even know how to find our compass anymore. However, not all this data is available and accessible. In this thesis, by navigating through the seas of available, open and even purchased data on board of our knowledge of physics and complex systems, we try to draw some new routes and shortcuts to study human mobility in different contexts, scales and applications.

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32

Luu, Duy Hao. "Gradient Theory: Constitutive Models and Fatigue Criteria." Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/docs/00/86/60/81/PDF/These_Duy-Hao_LUU.pdf.

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Le travail porte sur deux grandes classes de modèles mécaniques à gradient : les modèles de comportement élastoplastiques et les modèles de fatigue à grand nombre de cycles. Sa principale motivation vient du fait que les problématiques nanomécaniques deviennent de plus en plus importantes dans l'ingénierie et les technologies microélectromécaniques. Dans ces problèmes à petites échelles, les effets de gradient et d'échelle deviennent significatifs. Leur prise en compte dans le dimensionnement et donc dans les modèles de comportement et de durée de vie est nécessaire pour une bonne estimation d

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33

McCarthy, Ian M. "Theory and applications of consumer search models." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3319837.

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Thesis (Ph.D.)--Indiana University, Dept. of Economics, 2008.<br>Title from PDF t.p. (viewed on May 8, 2009). Source: Dissertation Abstracts International, Volume: 69-08, Section: A, page: 3242. Advisers: Roy Gardner; Michael Rauh.

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34

Costa, Nelson Haykin Simon. "Wideband MIMO channel models: Theory and practice." *McMaster only, 2007.

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35

Capriotti, Paolo. "Models of type theory with strict equality." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39382/.

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This thesis introduces the idea of two-level type theory, an extension of Martin-Löf type theory that adds a notion of strict equality as an internal primitive. A type theory with a strict equality alongside the more conventional form of equality, the latter being of fundamental importance for the recent innovation of homotopy type theory (HoTT), was first proposed by Voevodsky, and is usually referred to as HTS. Here, we generalise and expand this idea, by developing a semantic framework that gives a systematic account of type formers for two-level systems, and proving a conservativity result

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36

Kadam, Sangram Vilasrao. "Models of Matching Markets." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493461.

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The structure, length, and characteristics of matching markets affect the outcomes for their participants. This dissertation attempts to fill the lacuna in our understanding about matching markets on three dimensions through three essays. The first essay highlights the role of constraints at the interviewing stage of matching markets where participants have to make choices even before they discover their own preferences entirely. Two results stand out from this setting. When preferences are ex-ante aligned, relaxing the interviewing constraints for one side of the market improves the welfare f

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37

Correia, Fagner Cintra [UNESP]. "The standard model effective field theory: integrating UV models via functional methods." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151703.

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Correia, Fagner Cintra. "The standard model effective field theory : integrating UV models via functional methods /." São Paulo, 2017. http://hdl.handle.net/11449/151703.

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Orientador: Vicente Pleitez<br>Resumo: O Modelo Padrão Efetivo é apresentado como um método consistente de parametrizar FísicaNova. Os conceitos de Matching e Power Counting são tratados, assim como a Expansão emDerivadas Covariantes introduzida como alternativa à construção do conjunto de operadoresefetivos resultante de um modelo UV particular. A técnica de integração funcional é aplicadaem casos que incluem o MP com Tripleto de Escalares e diferentes setores do modelo 3-3-1 napresença de Leptons pesados. Finalmente, o coeficiente de Wilson de dimensão-6 gerado a partirda integração de um qu

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39

Thompson, Bernard Robert. "Theory of cluster-cluster aggregation." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238123.

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40

Elhouar, Mikael. "Essays on interest rate theory." Doctoral thesis, Handelshögskolan i Stockholm, Finansiell Ekonomi (FI), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hhs:diva-451.

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41

Combs, Adam. "Bayesian Model Checking Methods for Dichotomous Item Response Theory and Testlet Models." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1394808820.

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42

De, Aguinaga José Guillermo. "Uncertainty Assessment of Hydrogeological Models Based on Information Theory." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-71814.

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There is a great deal of uncertainty in hydrogeological modeling. Overparametrized models increase uncertainty since the information of the observations is distributed through all of the parameters. The present study proposes a new option to reduce this uncertainty. A way to achieve this goal is to select a model which provides good performance with as few calibrated parameters as possible (parsimonious model) and to calibrate it using many sources of information. Akaike’s Information Criterion (AIC), proposed by Hirotugu Akaike in 1973, is a statistic-probabilistic criterion based on the Info

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Pashourtidou, Nicoletta. "Cointegration in misspecified models." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252324.

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Shaikh, Zain U. "Some mathematical structures arising in string theory." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=158375.

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This thesis is concerned with mathematical interpretations of some recent develop- ments in string theory. All theories are considered before quantisation. The rst half of the thesis investigates a large class of Lagrangians, L, that arise in the physics literature. Noether's famous theorem says that under certain conditions there is a bijective correspondence between the symmetries of L and the \conserved currents" or integrals of motion. The space of integrals of motion form a sheaf and has a bilinear bracket operation. We show that there is a canonical sheaf d1;0 J1( ) that contains a repre

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45

Forchini, Giovanni. "Exact distribution theory for some econometric problems." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242631.

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46

Macorra, Axel de la. "Supersymmetry breaking in 4D string theory." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:0bc6b606-1a02-4d28-b68f-bd5c3ac11d04.

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In this thesis we address the problem of supersymmetry breaking in four dimensional string theory. We derive an effective Lagrangian describing the low energy degrees of freedom including the Goldstone mode associated with the spontaneously broken R-symmetry when a gaugino condensate forms. We show the equivalence between our approach and those previously used for studying gaugino condensate in 4D string theory but we also show the need to include quantum effects due to the strong coupling constant in the hidden sector. We determine the vacuum structure of the complete scalar potential and sho

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47

Liu, Binbin, and 刘彬彬. "Some topics in risk theory and optimal capital allocation problems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48199291.

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In recent years, the Markov Regime-Switching model and the class of Archimedean copulas have been widely applied to a variety of finance-related fields. The Markov Regime-Switching model can reflect the reality that the underlying economy is changing over time. Archimedean copulas are one of the most popular classes of copulas because they have closed form expressions and have great flexibility in modeling different kinds of dependencies. In the thesis, we first consider a discrete-time risk process based on the compound binomial model with regime-switching. Some general recursive formu

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48

Coyle, Andrew James. "Some problems in queueing theory." Title page, contents and summary only, 1989. http://web4.library.adelaide.edu.au/theses/09PH/09phc8812.pdf.

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49

Di, Natale Anna. "Stochastic models and graph theory for Zipf's law." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17065/.

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In questo elaborato ci siamo occupati della legge di Zipf sia da un punto di vista applicativo che teorico. Tale legge empirica afferma che il rango in frequenza (RF) delle parole di un testo seguono una legge a potenza con esponente -1. Per quanto riguarda l'approccio teorico abbiamo trattato due classi di modelli in grado di ricreare leggi a potenza nella loro distribuzione di probabilità. In particolare, abbiamo considerato delle generalizzazioni delle urne di Polya e i processi SSR (Sample Space Reducing). Di questi ultimi abbiamo dato una formalizzazione in termini di catene di Markov. I

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Chepkwony, Isaac. "Analysis and control theory of some cochlear models." [Ames, Iowa : Iowa State University], 2006.

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