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Dissertations / Theses on the topic 'Correlation dependence'

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Published: 3 June 2025
Last updated: 31 July 2025

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1

Luo, Yabing. "A Correlation-Based Method to Detect Weak Dependence." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2479.

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The focus of this thesis is an investigation of ways to detect weak dependence between two random variables X and Y. Our approach is to design tests for correlation rather than testing for dependence directly, since X and Y are not independent if they are not uncorrelated. We examined the magnified Pearson correlation after the Box-Cox transformation to determine whether X and Y are dependent. The results indicated that our approach not only has the potential to detect and evaluate the weak dependence cases that have previously been intractable, but also is conceptually simple and easy to impl
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2

Sim, Nicholas. "Modeling Quantile Dependence." Thesis, Boston College, 2009. http://hdl.handle.net/2345/2467.

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Thesis advisor: Zhijie Xiao<br>In recent years, quantile regression has achieved increasing prominence as a quantitative method of choice in applied econometric research. The methodology focuses on how the quantile of the dependent variable is influenced by the regressors, thus providing the researcher with much information about variations in the relationship between the covariates. In this dissertation, I consider two quantile regression models where the information set may contain quantiles of the regressors. Such frameworks thus capture the dependence between quantiles - the quantile of th
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3

Liu, Li-yu Daisy. "Coefficient of intrinsic dependence: a new measure of association." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2397.

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To detect dependence among variables is an essential task in many scientific investigations. In this study we propose a new measure of association, the coefficient of intrinsic dependence (CID), which takes value in [0,1] and faithfully reflects the full range of dependence for two random variables. The CID is free of distributional and functional assumptions. It can be easily implemented and extended to multivariate situations. Traditionally, the correlation coefficient is the preferred measure of association. However, it's effectiveness is considerably compromised when the random variables a
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4

Eriksson, Kristofer. "Risk Measures and Dependence Modeling in Financial Risk Management." Thesis, Umeå universitet, Institutionen för fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85185.

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In financial risk management it is essential to be able to model dependence in markets and portfolios in an accurate and efficient way. A high positive dependence between assets in a portfolio can be devastating, especially in times of crises, since losses will most likely occur at the same time in all assets for such a portfolio. The dependence is therefore directly linked to the risk of the portfolio. The risk can be estimated by several different risk measures, for example Value-at-Risk and Expected shortfall. This paper studies some different ways to measure risk and model dependence, both
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5

He, Li. "Incorporating Correlations to Improve Multiple Testing Procedures Controlling False Discoveries." Diss., Temple University Libraries, 2011. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/144091.

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Statistics<br>Ph.D.<br>Multiple testing is playing an important role in analyzing data from modern scientific investigations. Some fundamentally important theoretical and methodological issues related to multiple testing still remain to be fully investigated. Often the correlation structure among test statistics involved in multiple testing is known a priori or it can be estimated from the data, yet this structure is not often properly taken into consideration while developing multiple testing procedures, even though not doing so might result in a less powerful method than one would like to ha
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6

Zeise, Carl Eric. "Analysis of trade dependence and correlation of market returns to hedge portfolio risk." CSUSB ScholarWorks, 2006. https://scholarworks.lib.csusb.edu/etd-project/3036.

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The project examines the relationship between trade interdependency and correlation of market returns between the United States and the four emerging economies of Singapore, Malaysia, Thailand and the Philippines. The author analyzed statistical data for trade interdependency and market return to determine if there is a pattern that would provide the basis for increasing the return of a security portfolio without increasing the risk to the investor. The project analysis relied on mathematical formulas to measure the trade relationships between the selected countries and to calculate the measur
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7

Belu, Alexandru C. "Multivariate Measures of Dependence for Random Variables and Levy Processes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1333396376.

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8

O, Dohonova K., and Bortnik Y. V. "Construction of dependence function of annual passenger flow and GPD per capita." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/50700.

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1. Higher Mathematics: manual. Theory of Probability and Elements of Mathematical Statistics / V.P. Denisiuk, V.M. Bobkov, L.A. Grishina – K.: NAU, 2013. 210-216 pages. 2. Пасажиропотік аеропортів України [Electronic source] - https://www.wikiwand.com/uk/Пасажиропотік_аеропортів_України/Загальний_пасажиропотік_аеропортів_України. 3. Валовой внутренний продукт (ВВП) в Украине 2021[Electronic source] -https://index.minfin.com.ua/economy/gdp/<br>In many problems of physics, economics, medicine, engineering, etc. we have to experimentally study the dependence of a random variable Y, observed, on
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9

Yokomizu, Yasunobu, Toshiro Matsumura, Akiji Matsuda, and Hideyuki Ohno. "Dependence of arc interrupting capability on spatial distribution of airflow velocity in air-blast flat-type quenching chamber." IEEE, 2003. http://hdl.handle.net/2237/6793.

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10

Saar, Helen. "Analysis of trade dependence and correlation of market returns between the United States and Nordic countries." CSUSB ScholarWorks, 2007. https://scholarworks.lib.csusb.edu/etd-project/3269.

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The purpose of the present research paper was three fold. First, determine if there is a trade interdependence between the United States and Nordic countries (Denmark, Finland, Sweden, and Baltic States). Second, determine if there is correlation between the respective equity markets. Third, determine if the changes in the trade relations lead to the changes in stock market correlations. The hypothesis of the project was that weaker trade relations between two countries would lead to lower correlation between their stock markets, providing beneficial opportunities for portfolio diversification
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11

Lu, Shihai. "Novel Step-Down Multiple Testing Procedures Under Dependence." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1416594298.

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12

Angelchev, Shiryaev Artem, and Johan Karlsson. "Estimating Dependence Structures with Gaussian Graphical Models : A Simulation Study in R." Thesis, Umeå universitet, Statistik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184925.

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Graphical models are powerful tools when estimating complex dependence structures among large sets of data. This thesis restricts the scope to undirected Gaussian graphical models. An initial predefined sparse precision matrix was specified to generate multivariate normally distributed data. Utilizing the generated data, a simulation study was conducted reviewing accuracy, sensitivity and specificity of the estimated precision matrix. The graphical LASSO was applied using four different packages available in R with seven selection criteria's for estimating the tuning parameter. The findings ar
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13

Castro, Carlos. "Essays in dependence and optimality in large portfolios." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210186.

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This thesis is composed of three chapters. The first two chapters provides novel approaches for<p>modeling and estimating the dependence structure for a large portfolio of assets using rating data.<p>In both chapters a natural form of organizing a portfolio in terms of the levels of exposure to economic sectors and geographical regions, plays a key role in setting up the dependence structure.<p>The last chapter investigates weather financial strategies that exploit sector or geographical heterogeneity in the asset space are relevant in terms of portfolio optimization. This is also done in a co
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14

Hu, Yanchen. "Investigation of Electron Transfer and Solvation Dynamics in (6-4) Photolyase." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437754218.

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15

Boyce, Kari E. "Delivering continuing professional education at a distance : the correlation of field dependence/independence and learning using the World Wide Web /." Full-text version available from OU Domain via ProQuest Digital Dissertations, 1999.

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16

Mestres, Adrià Caballé. "Statistical methods for the testing and estimation of linear dependence structures on paired high-dimensional data : application to genomic data." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31331.

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This thesis provides novel methodology for statistical analysis of paired high-dimensional genomic data, with the aimto identify gene interactions specific to each group of samples as well as the gene connections that change between the two classes of observations. An example of such groups can be patients under two medical conditions, in which the estimation of gene interaction networks is relevant to biologists as part of discerning gene regulatory mechanisms that control a disease process like, for instance, cancer. We construct these interaction networks fromdata by considering the non-zer
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17

Berg, Edvin, and Karl Wilhelm Lange. "Enhancing ESG-Risk Modelling - A study of the dependence structure of sustainable investing." Thesis, KTH, Matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266378.

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The interest in sustainable investing has increased significantly during recent years. Asset managers and institutional investors are urged to invest more sustainable from their stakeholders, reducing their investment universe. This thesis has found that sustainable investments have a different linear dependence structure compared to the regional markets in Europe and North America, but not in Asia-Pacific. However, the largest drawdowns of an sustainable compliant portfolio has historically been lower compared to the a random market portfolio, especially in Europe and North America.<br>Intres
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18

Bergmann, Daniel Reed. "Estratégias de diversificação de carteiras de ações com dependência assimétrica." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/12/12139/tde-02072013-150620/.

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DeMiguel, Garlappi e Uppal (2009) fizeram a comparação da regra 1/N ou de Talmud com 14 modelos de otimização que vieram depois do trabalho de Markowitz (1952). As conclusões mostraram que todos os modelos de alocação ótima analisados tiveram um desempenho inferior ao da regra de Talmud. Tu e Zhou (2011) propuseram uma combinação entre Markowitz e Talmud para que tal modelo superasse Talmud. Os resultados obtidos foram satisfatórios. A desconsideração dos eventos extremos (dependência assimétrica ou caudal) durante o processo de construção de carteiras poderá diminuir as habilidades dos gestor
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19

Paler, Mary Elvi Aspiras. "On Modern Measures and Tests of Multivariate Independence." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1447628176.

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20

Rahman, Dima. "The fragility of financial institutions : dependence structure, extremal behaviour and contagion." Thesis, Paris 10, 2011. http://www.theses.fr/2011PA100128.

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Cette thèse se propose d’analyser la structure et la dynamique de dépendance de crédit des institutions financières aux Etats-Unis et en Europe durant la crise financière de 2008. Un premier chapitre présente une revue de la littérature des modèles multi-dimensionnels de crédit et des modèles économétriques de contagion financière. Ce chapitre a pour vocation de guider notre réflexion à la fois conceptuelle et méthodologique sur les hypothèses analytiques de la contagion ainsi que ses méthodes de mesure. Nous montrons que si la contagion est devenue une hypothèse centrale des modèles multivari
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21

Korb, Jean-Pierre, Gianni Ferrante, Salvatore Bubici, and Mike Mallett. "New instrumental platform for the exploitation of the field-dependence of T 1 in rock core analysis and petroleum fluids: application to T 1-T 2 correlation maps." Diffusion fundamentals 22 (2014) 5, S. 1-7, 2014. https://ul.qucosa.de/id/qucosa%3A13480.

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We propose using the latest wide bore fast field cycling NMR relaxometers for measuring the nuclear magnetic relaxation dispersion (NMRD) profiles of the logarithmic average proton-water <1/T1> in carbonate rock cores samples of 1 inch diameter and in different crude oil/brine mixings. The observed bilogarithmic frequency behaviours of the NMRD have been interpreted with a proposed theoretical model yielding a measurement of the water local wettability at the pore surface. We have also proposed a NMR platform that uses a variable wide-bore cryogen-free superconducting magnet to acquire 2D T
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22

Xie, Shanju. "Magnetic studies of dusts in the urban environment." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367206.

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23

Ксьондзик, Наталія Михайлівна, та Nataliya Ksondzyk. "Багатофункціональний комплекс з житлом в м. Золочів із дослідженням міцності бетону С32/40 неруйнівними методами контролю". Thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2017. http://elartu.tntu.edu.ua/handle/123456789/19293.

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Роботу виконано на кафедрі будівельної механіки Тернопільського національного технічного університету імені Івана Пулюя Міністерства освіти і науки України Захист відбудеться 22 лютого 2017 р. о 10 .00 годині на засіданні екзаменаційної комісії №7 у Тернопільському національному технічному університеті імені Івана Пулюя за адресою: 46001, м. Тернопіль, вул. Руська, 56, навчальний корпус №2, ауд. 35.<br>В дипломній роботі розроблено проект монолітного багатофункціонального комплексу з житлом та виконано експериментальні дослідження, що стосуються нер
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SILVA, RENILSON A. da. "Estudo de interacoes hiperfinas eletromagneticas em oxidos perovskitas do tipo RCrOsub(3)(R=Gd, Tb e Dy)." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9480.

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Made available in DSpace on 2014-10-09T12:27:11Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:57:37Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Rutkowski, Mitchell M. "Growth Parameter Dependence and Correlation of Native Point Defects and Dielectric Properties in BaxSr1-xTiO3 Grown by Molecular Beam Epitaxy." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366299175.

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26

Santos, Josivon Souza dos. "Simulações de variáveis aleatórias dependentes: Aplicação ao risco subscrição." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-23062013-173744/.

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Com a crescente demanda de modelagem de riscos dependentes, enfatizamos neste trabalho a teoria de cópulas e algumas medidas de dependência tais como coeficiente de correlação linear, coeficiente de correlação de Spearman. Mostramos algumas interpretações errôneas sobre o coeficiente de correlação linear e como podemos realizar simulações de variáveis aleatórias com determinadas marginais e dependência. Realizamos uma aplicação na área de seguros para determinar o capital alocado da seguradora.<br>With the growing demand for modeling dependent risk, in this study we emphasize the theory of cop
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27

Becker, Christoph [Verfasser]. "State dependent dependencies : a continuous time dynamics for correlations / Christoph Becker." Frankfurt am Main : Frankfurt School of Finance & Management gGmbH, 2011. http://d-nb.info/1013025776/34.

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28

LAPOLLI, ANDRE L. "Estudo de interações hiperfinas em compostos intermetálicos Gd(Ni, Pd, Cu)In, Tb(Ni, Pd)In, Dy(Ni, Pd)In e Ho(Ni, Pd)In." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11371.

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Made available in DSpace on 2014-10-09T12:51:12Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:53Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Nallagatla, Vishnu Priya. "Sequential decision fusion of multibiometrics applied to text-dependent speaker verification for controlled errors." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/63348/1/Vishnu_Nallagatla_Thesis.pdf.

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Reliability of the performance of biometric identity verification systems remains a significant challenge. Individual biometric samples of the same person (identity class) are not identical at each presentation and performance degradation arises from intra-class variability and inter-class similarity. These limitations lead to false accepts and false rejects that are dependent. It is therefore difficult to reduce the rate of one type of error without increasing the other. The focus of this dissertation is to investigate a method based on classifier fusion techniques to better control the trade
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Bredeby, Rickard. "Analysis of Copula Opinion Pooling with Applications to Quantitative Portfolio Management." Thesis, KTH, Matematisk statistik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168200.

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In 2005 Attilio Meucci presented his article Beyond Black-Litterman: Views on Non-Normal Markets which introduces the copula opinion pooling approach using generic non-normal market assumptions. Copulas and opinion pooling are used to express views on the market which provides a posterior market distribution that smoothly blends an arbitrarily distributed market prior distribution with arbitrarily chosen views. This thesis explains how to use this method in practice and investigates its performance in different investment situations. The method is tested on three portfolios, each showing some
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Ferreira, Flavio Henn. "Medidas de assimetria bivariada e dependência local." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-30102008-000235/.

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Esta tese trata de dois assuntos importantes na teoria de risco: o fenômeno da dependência local e a identificação e mensuração de assimetrias apresentadas pelos dados. A primeira parte trata de dependência local, sendo abordadas algumas medidas já analisadas na literatura. Versões locais dos coeficientes de Kendall e Spearman , baseadas na distribuição condicional dos dados, são propostas. São apresentadas algumas propriedades dessas medidas e a aplicação das mesmas a algumas cópulas. Na segunda parte são apresentados resultados sobre cópulas bivariadas que são as menos associativas e menos
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Gooch, Diane S. "Tourism Dependency and its Correlation to Selected Socioeconomic Indicators in Utah." DigitalCommons@USU, 1990. https://digitalcommons.usu.edu/etd/4043.

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This paper investigates the relationship between tourism and well being, or quality-of-life, within eighteen counties in Utah. To evaluate the relationship, comparisons of the counties' differing l evel s of tourism versus their levels of welfare are necessary. To make these comparisons, three basic steps were followed. First, a social ordering model was derived. The proposed social ordering model was based upon Maslow's theory of the hierarchy of human needs. By utilizing his theory, both economic and noneconomic indicators were identified, and a basis was provided upon which to judge the dif
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Schiller, Roland. "Correlation effects and temperature dependencies in thin ferromagnetic films." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2000. http://dx.doi.org/10.18452/14526.

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Diese Dissertation beschäftigt sich mit theoretischen Untersuchung der elektronischen und magnetischen Eigenschaften von 4f-Systemen mit Filmgeometrie. Die vorgestellte Theorie basiert auf dem s-f-Modell, welches durch einen intra-atomaren Austausch zwischen einem System lokaler magnetischer Momente und den Leitungselektronen charakterisiert ist. Das Modell wird für den Fall des leeren Leitungsbandes untersucht. Der untersuchte Spezialfall ist anwendbar auf die Klasse der ferromagnetischen Halbleiter mit den Europiumchalkogeniden EuO und EuS als Prototypen solcher Substanzen. Für
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34

Teng, Long [Verfasser]. "Modelling of Credit Risk and Correlation Risk: Time-Dependent and Stochastic Correlation Models / Long Teng." Wuppertal : Universitätsbibliothek Wuppertal, 2015. http://d-nb.info/1081328908/34.

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35

Park, Youngsoo. "Centrality dependence of two-particle correlations in relativistic heavy ion collisions." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/51591.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.<br>Includes bibliographical references (p. 63-64).<br>Results on the centrality dependence of two-particle correlations in Au+Au collisions at ... 200GeV are presented. A particular focus is devoted to investigating any anomalous behavior in the centrality dependence of correlation functions, as previous results suggest existence of such tendencies around Npart [approx.] 50. Correlation functions are calculated for a wide kinematic region of ... from data obtained by the PHOBOS experiment at RHIC. The RHIC layout and
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Garcia, Alberto J. "Parameter Dependence of Pair Correlations in Clean Superconducting-Magnetic Proximity Systems." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10841350.

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<p> Cooper pairs are known to tunnel through a barrier between superconductors in a Josephson junction. The spin states of the pairs can be a mixture of singlet and triplet states when the barrier is an inhomogeneous magnetic material. The purpose of this thesis is to better understand the behavior of pair correlations in the ballistic regime for different magnetic configurations and varying physical parameters. We use a tight-binding Hamiltonian to describe the system and consider singlet-pair conventional superconductors. Using the Bogoliubov-Valatin transformation, we derive the Bogoliubov-
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COSSEDDU, PIERO. "Correlation between interface-dependent properties and electrical performances in OFETs." Doctoral thesis, Università degli Studi di Cagliari, 2007. http://hdl.handle.net/11584/265941.

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One of the fundamental points in determining the electrical performances in organic devices is that, even though they are usually thought as macroscopic devices, their behaviour is strongly driven by interfacial phenomena taking place in the nano scale. The focus of this thesis is the realization and characterization of Organic Field effect Transistors (OFETs) with a particular interest for investigating the influence of the interfaces on the electrical performances of the devices. Indeed, the parameters which mostly influence the electrical behaviour can be divided into to groups: 1) Intr
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Závodský, Peter. "Mechanické vlastnosti nízkouhlíkových a nízkolegovaných ocelí, stanovené pomocí protlačovacích zkoušek na miniaturních discích při pokojové a snížených teplotách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254313.

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The presented diploma thesis deals with an innovative material test, so called Small Punch Test. There are main principles, advantages and limitations of the test stated in the thesis. There are stated also correlation procedures in order to obtain standard mechanical properties. A test fixture design has been done in order to perform test procedures at temperature range from 80 to 25 °C. Twelve experimental curves have been obtained from the test and typical quantities have been evaluated. The different accuracy of correlations with standard mechanical properties has been obtained using diffe
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Andersson, Filip. "Evaluation of the correlation between test cases dependency and their semantic text similarity." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-48942.

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An important step in developing software is to test the system thoroughly. Testing software requires a generation of test cases that can reach large numbers and is important to be performed in the correct order. Certain information is critical to know to schedule the test cases incorrectly order and isn’t always available. This leads to a lot of required manual work and valuable resources to get correct. By instead analyzing their test specification it could be possible to detect the functional dependencies between test cases. This study presents a natural language processing (NLP) based approa
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Jacobson, David. "Spectral modulation, gravity and time-dependent correlations in neutron interferometry /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9720550.

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Roque, Thales Figueiredo 1988. "Correlações quânticas entre dois osciladores conectados por um acoplamento dependente do tempo." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278009.

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Orientador: José Antonio Roversi<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-20T23:06:34Z (GMT). No. of bitstreams: 1 Roque_ThalesFigueiredo_M.pdf: 4513526 bytes, checksum: 591f56a02e8cf1895d520faa78c27465 (MD5) Previous issue date: 2012<br>Resumo: Neste trabalho analisamos a dinâmica das correlações quânticas em um sistema composto por dois osciladores harmônicos em contato com um mesmo reservatório térmico e acoplados entre si com um acoplamento dependente do tempo. O reservatório térmico modelado d
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Dezhbakhsh, Hashem. "Alternative tests for serial correlation in linear models with lagged dependent variables." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1279570294.

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43

Rojas, Lobos Patricia. "Modeling time-dependent optical and UV correlations in active galactic nuclei." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAE022/document.

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Les Noyaux actifs de galaxie (AGN) incluent les sources quasi stables les plus énergétiques connues dans l'univers jusqu'à aujourd’hui. Du fait de leur distance, de leur haute luminosité et de leur petite taille, leurs régions intérieures ne sont pas directement résolvables avec les télescopes actuels. C’est pour ces raisons que nous avons besoin de techniques d’observation indirectes et de modèles théoriques pour discerner leur structure. Dans cette optique, le rôle de la polarimétrie est crucial. Elle a été ces dernières années la méthode clé qui a permis de développer le modèle unifié des A
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44

Thome, Alexander. "Experience-Dependent Network Modification in the Medial Temporal Lobe." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/223358.

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Theoretical models of information storage in the brain have suggested that neurons may undergo an experience-dependent tuning or sharpening of their representations in order to maximize the amount of information that can be stored. Changes in the tuning profiles of neurons have been demonstrated to occur when animals must learn perceptual discriminations, however, whether similar changes occur in the absence of behavioral demands is unclear. To address these questions, the activity of simultaneously recorded medial temporal lobe (MTL) neurons was studied in relation to a passive visual recogni
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45

Xu, Bei. "Les approches extrêmes de la contagion sur les marchés financiers." Thesis, Bordeaux 4, 2012. http://www.theses.fr/2012BOR40033.

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La thèse est composée de trois parties. La première présente un certain nombre de mesures de dépendance extrême. Une application sur les actions et les obligations de 49 pays montre que la théorie des valeurs extrêmes multivariées conduit aux résultats différents de ceux issus du coefficient de corrélation, mais relativement proches de ceux obtenus du rho de Spearman conditionnel multivarié. Cette partie évalue aussi le risque de pertes importantes simultanées. La deuxième partie examine les déterminants des co-mouvements extrêmes entre 5 pays core et 49 pays non core. Les mécanismes de transm
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Fransson, Jonas. "Non-Orthogonality and Electron Correlations in Nanotransport : Spin- and Time-Dependent Currents." Doctoral thesis, Uppsala University, Department of Physics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-2687.

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<p>The concept of the transfer Hamiltonian formalism has been reconsidered and generalized to include the non-orthogonality between the electron states in an interacting region, e.g. quantum dot (QD), and the states in the conduction bands in the attached contacts. The electron correlations in the QD are described by means of a diagram technique for Hubbard operator Green functions for non-equilibrium states. </p><p>It is shown that the non-orthogonality between the electrons states in the contacts and the QD is reflected in the anti-commutation relations for the field operat
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Paranagama, Dilan C. "Correlation and variance stabilization in the two group comparison case in high dimensional data under dependencies." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/13132.

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Doctor of Philosophy<br>Department of Statistics<br>Gary L. Gadbury<br>Multiple testing research has undergone renewed focus in recent years as advances in high throughput technologies have produced data on unprecedented scales. Much of the focus has been on false discovery rates (FDR) and related quantities that are estimated (or controlled for) in large scale multiple testing situations. Recent papers by Efron have directly addressed this issue and incorporated measures to account for high-dimensional correlation structure when estimating false discovery rates and when estimating a density.
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Napier, Stuart A. "Electron correlation and spin-dependent effects in the electron impact excitation of zinc atoms." University of Western Australia. School of Physics, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0098.

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[Truncated abstract] This work investigated electron correlation and spin-dependent effects in electron scattering from zinc for incident electron energies from the lowest excitation threshold at 4.003 eV to 50 eV. Experiments were performed using a crossed-beams electron impact spectrometer, which included an unpolarised electron gun, and also a spin-polarised electron gun. The apparatus was tested, and shown to be operating well, by repeating past studies of electron scattering from helium and argon. Emission cross sections for the 4s4p 3P1, 4s4p 1P1, 4s5s 3S1, 4s4d; 5d; 6d 3D1;2;3 and 4s4d;
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Lindner, Dominik. "Towards the fracture prediction of turbomachinery disks : a contribution of the digital image correlation." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN023/document.

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Cette thèse s'intéresse à l'amélioration de la prévision de l'éclatement des pièces tournantes des turbomachines. L'axe de recherche principal a été celui de l'identification du comportement du matériau jusqu'à rupture pour des sollicitations multi-axiales représentatives et l'identification des conditions de rupture locale elles mêmes. Pour cela une approche basée sur la corrélation d'image numérique intégrée a été suivie. L'autre axe abordé dans cette thèse a été celui de la prévision objective et robuste de la rupture par la mécanique de l'endommagement dans le cadre de simulations explicit
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Colliaux, David. "Classes of neuronal dynamics and experience dependent structured correlations in the visual cortex." Palaiseau, Ecole polytechnique, 2011. http://pastel.archives-ouvertes.fr/docs/00/67/61/04/PDF/HPEA.pdf.

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Neuronal activity is often considered in cognitive neuroscience by the evoked response but most the energy used by the brain is devoted to the sustaining of ongoing dynamics in cortical networks. A combination of classification algorithms (K means, Hierarchical tree, SOM) is used on intracellular recordings of the primary visual cortex of the cat to define classes of neuronal dynamics and to compare it with the activity evoked by a visual stimulus. Those dynamics can be studied with simplified models (FitzHugh Nagumo, hybrid dynamical systems, Wilson Cowan) for which an analysis is presented.
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