Dissertations / Theses on the topic 'Universal models'
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Jung, Seohyun. "Average-case Completeness Results Using Universal Computational Models." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case160752432028902.
Full textOliver, Guillen Jose Fco. "Aspects of universal extra dimensional models and their latticized versions." Doctoral thesis, Universitat de València, 2004. http://hdl.handle.net/10803/9882.
Full textLa primera parte de la tesis está relacionada con modelos con dimensiones extra universales (todas las partículas se propagan en la dimensión extra). En estos modelos, a bajas energías, los primeros efectos aparecen al nivel de un loop. Como consecuencia, nuevas partículas relacionadas con las dimensiones extra pueden ser relativamente ligeras. En esta parte se analiza quan ligeras pueden ser y si pueden ser producidas en las actuales o inmediatamente futuras instalaciones experimentales. La tesis estudia las contribuciones a la desintegración del Z en quarks b, la cual muestra una fuerte dependencia con la masa del top y experimentalmente está bien medida . Este proceso proporciona el mejor límite en la masa de las nuevas partículas, junto con elobtenido del parámetro rho. De todos modos, solo es 300 GeV (95 % CL), lo que hace accesibles las nuevas partículas a las futuras instalaciones experimentales.En la segunda parte, se estudian las correcciones a las constantes gauge en forma de potencias en modelos con dimensiones extra. Lo cual es muy importante porque si estas correcciones pudiesen ser controladas podría ser posible comprobar modelos de Gran Unificación a bajas energías. Usando teorías efectivas, se concluye en la tesis que estas correcciones pueden ser calculadas sin ambigüedad solo cuando se conoce, aunque sea parcialmente, la teoría más completa que genera la teoría extra dimensional.Finalmente la tesis presenta las versiones latizadas de dos modelos diferentes con dimensiones extra y estudia su fenomenología.
Levi, Emanuele. "Universal properties of the entanglement entropy in quantum integrable models." Thesis, City University London, 2013. http://openaccess.city.ac.uk/3041/.
Full textDai, Shibin. "Universal bounds on coarsening rates for some models of phase transitions." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2376.
Full textThesis research directed by: Mathematics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Hohman, Jessica A. "Achieving Universal Health Care in the United States Using International Models." Miami University Honors Theses / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=muhonors1146785935.
Full textHammond, Terry Richard. "Feasible Models of Universal Health Insurance in Oregon According to Stakeholder Views." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/500.
Full textAkinepally, Pratima Rao. "Investigating Performance of Different Models at Short Text Topic Modelling." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-288531.
Full textDet huvudsakliga syftet med det i denna uppsats rapporterade projektet är att kvantitativt och kvalitativt utvärdera och jämföra hur väl Universal Sentence Encoder USE, ett semantiskt vektorrum för meningar, och word2vec, ett semantiskt vektorrum för ord, fungerar för att modellera ämnesinnehåll i text. Projektet har som träningsdata använt skriftliga sammanfattningar och ämnesetiketter för podd-episoder som gjorts tillgängliga av Spotify. De skriftliga sammanfattningarna har använts för att generera både vektorer för de enskilda podd-episoderna och för de ämnen de behandlar. De båda ansatsernas vektorer har sedan utvärderats genom att de använts för att tilldela ämnen till beskrivningar ur en testmängd. Resultaten har sedan jämförts och leder både till den allmänna slutsatsen att semantiska vektorrum är väl lämpade för den här sortens uppgifter, och att USE totalt sett överträffar word2vec-modellerna.
Madureira, Carla Raquel Castro da Rocha. "New generation networks and the telecommunications universal service in Portugal." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14096.
Full textThis thesis addresses the issue of Universal Service for telecommunications in the context of the access networks of next generation. This work aims to contribute to the redefinition of the concept of universal telecommunications service focusing primarily on extending it to broadband services as economic and social development factor and taking into account the degree of dependence that currently, modern societies have for the different communication and information services. Complementarily it also intended to meet some of the challenges set out in the European 2020 agenda. Universal Service is defined here as access to a telecommunications network (with obligations in terms of type and quality of service for the operator), by of all citizens at any country's geographical location, with uniform and accessible price. The approach adopted is the State as a mentor for social equity, respectful of the liberalized market dynamics but also knowledgeable of the requirements of modern telecommunications services and its relationship with the different technologies available. The possibility of subsidizing is assumed. The Universal Service´s provision is subject to open to all operators, which are assumed to possess other profitability businesses, than the Universal Service, using technologies similar to those prescribed for the respective Universal Service provision contest. Although the work has components of economic and financial analysis, the approach is the engineering point of view, looking for help to identify technical and organizational solutions which offer prospects for the dissemination and adoption of next generation network solutions. As a point of departure the work gives an overview on the state of the art access networks , trying to identify which of the differences between this reality and possible scenarios for next-generation network with potential access to the generality of the people . The case of the Portuguese reality will be given special attention, taking into account their specific characteristics in terms of geography, demography, economics and market dynamics. The main results of this work are: • Identification of possible scenarios for the evolution of existing networks, in particular in areas with deficit coverage. • Identification of possible operating models and business to the materialization of the above scenarios developed and its economic analysis in an attempt to determine the critical factors associated with sustainability and / or need for subsidies. • Contribution to the regulatory framework of new generation networks from the point of view of the constraints of technology and the specifics of the Universal Service.
Esta tese aborda a questão do serviço universal de telecomunicações no contexto das redes de acesso de nova geração. Este trabalho pretende contribuir para a redefinição do conceito de Serviço Universal de Telecomunicações concentrando-se principalmente em estendê-lo a serviços de banda larga como factor de desenvolvimento económico e social e tendo em conta o grau de dependência que, actualmente, as sociedades modernas têm em relação aos diferentes serviços de comunicação e informação. De forma complementar pretende-se também ir ao encontro de alguns dos desafios enunciados na Agenda Europeia 2020. Serviço Universal é aqui definido como o acesso a uma rede de telecomunicações (com obrigações em termos de tipo e qualidade de serviço para o operador), por parte de todos os cidadãos, em qualquer localização geográfica do país, a preços uniformes e acessíveis. A perspectiva adoptada é a Estatal como mentor da equidade social, respeitador das dinâmicas de mercado liberalizado mas também conhecedor dos requisitos dos modernos serviços de telecomunicações e da sua relação com as diferentes tecnologias disponíveis. A possibilidade de subsidiação é assumida. A prestação de Serviço Universal é sujeita a concurso aberto a todos os operadores, que se assume possuírem outros negócios, que não apenas o Serviço Universal, com rentabilidade e usando tecnologias semelhantes às preconizadas para a respectiva prestação de Serviço Universal. Embora o trabalho desenvolvido tenha componentes de análise económico-financeira, a abordagem utilizada é a de engenharia, procurando contribuir para a identificação de soluções técnicas e organizacionais que possam oferecer perspectivas sustentáveis para a disseminação e adopção das soluções redes de nova geração. Como ponto de partida o trabalho apresenta uma visão geral sobre o estado da arte das redes de acesso, procurando identificar quais os diferenciais existentes entre essa realidade e a de possíveis cenários de rede de próxima geração com potencial de acesso para a generalidade dos cidadãos. O caso da realidade Portuguesa será objecto de uma atenção especial, tendo em consideração as suas especificidades em termos de geografia, demografia, economia e dinâmicas do mercado. Os principais resultados deste trabalho são os seguintes: • Identificação de possíveis cenários para a evolução das redes actuais, nomeadamente em áreas com deficit de cobertura de rede. • Identificação de possíveis modelos de operação e negócio para a materialização dos cenários acima desenvolvidos e respectiva análise económica, como tentativa de determinar os factores críticos associados à sua sustentabilidade e /ou necessidade de subsidiação. • Contributo para o quadro regulatório das Redes de Nova Geração sob o ponto de vista dos constrangimentos das tecnologias e das especificidades do Serviço Universal.
Ilisei, Iustina-Narcisa. "A machine learning approach to the identification of translational language : an inquiry into translationese learning models." Thesis, University of Wolverhampton, 2012. http://hdl.handle.net/2436/299371.
Full textSpies, Andreas [Verfasser], and Gisela [Akademischer Betreuer] Anton. "The ANTARES neutrino telescope and constraints for non-universal supersymmetric models from recent experimental results / Andreas Spies. Gutachter: Gisela Anton." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2014. http://d-nb.info/1075742196/34.
Full textMathews, Kai Monet. "Transformative Models in K-12 Education| The Impact of a Blended Universal Design for Learning Intervention. An Experimental Mixed Methods Study." Thesis, University of San Diego, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128128.
Full textAccountability measures, by way of standardized curriculum and assessments, have played a large part in the attempt to ensure that students from all backgrounds receive equal access to quality education. However, the inherent disadvantage of a standardized system is the implied assumption that all students come in with the same knowledge, learn at the same pace, and learn the same way. In the wake of an increasingly diverse K-12 population, educational researchers, learning theorists, and practitioners agree that the concept of the average student is, in fact, a myth. Students come to school with different needs, norms, interests, cultural behavior, knowledge, motivations, and skill sets. In order for education to properly address the issue of equity, the issue of learner variance must first be attended to.
In 2010, the U.S. Department of Education released its educational plan encouraging teachers to address student variance through more inclusive learning environments. The report highlighted Blended Learning (BL) and Universal Design for Learning (UDL) as promising practices in enabling, motivating, and inspiring all students to achieve regardless of background, language, or disability. Research suggests that the combination of these two approaches could lead to transformative teaching practices that dramatically impact student learning. However, the efficacy of such a model has yet to be tested.
This study tested the efficacy of a Blended Universal Design for Learning (BUDL) model in improving student outcomes. An experimental design was used to explore the impact of a two-week BUDL intervention in an accelerated 7 th grade math class. The effect on student achievement, engagement, and perception was measured. Both quantitative and qualitative data were collected. Though results from the study were statistically insignificant, possible positive associations between a BUDL intervention and student achievement, engagement, and perception emerged. Considerations for clinical significance, suggestions for improvement on the BUDL model, and implications for future research are discussed.
Slack, Sean Edward. "Essays on categorical and universal welfare provision : design, optimal taxation and enforcement issues." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/15659.
Full textEdwards, David Craig. "Theoretical considerations in the use of scalar-tensor theories of gravity in inflationary models." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31404.
Full textJirawattanapisal, Thidaporn. "Delivering ART service in Thailand : predicting future workforce requirements and deployment patterns enabling and sustaining universal access through different models of care." Thesis, Queen Margaret University, 2014. https://eresearch.qmu.ac.uk/handle/20.500.12289/7465.
Full textThompson, Andrew Robert. "Heterotrophic Protists as Useful Models for Studying Microbial Food Webs in a Model Soil Ecosystem and the Universality of Complex Unicellular Life." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8575.
Full textGiansante, Moacir. "Aplicação de modelos de engenharia para a identificação dos custos de universalização nas telecomunicações." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259758.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-08T21:31:35Z (GMT). No. of bitstreams: 1 Giansante_Moacir_M.pdf: 31760626 bytes, checksum: 1c3f355aabddb68180939401b269973f (MD5) Previous issue date: 2007
Resumo: Este estudo apresenta uma metodologia para calcular os custos decorrentes de projetos de universalização de serviços de telecomunicações, conforme estabelece a legislação brasileira, denominados como custos líquidos em outras legislações. Tal conceito é baseado na obtenção dos custos evitáveis e para seu cálculo, os custos atribuídos ao cumprimento das obrigações devem ser alocados de forma a guardar relação com a atividade que o gerou bem como com a quantidade de serviços/produtos produzidos. A metodologia também deve ser capaz de capturar economias de escala e de escopo decorrentes de compartilhamento de recursos e de otimização das capacidades instaladas. Por isso, propõe-se um modelo que combine os conceitos de custos incrementais e de custos prospectivos de longo prazo de forma flexível e que permita a análise de diferentes projetos de universalização
Abstract: This study presents a methodology to calculate the net costs resulting from telecommunications universal services, in accordance with Brazilian legislation. Such a concept is based on the estimation of the avoidable costs due to universal obligations. In order to proceed with the calculations, the costs attributed to these obligations should be allocated to guard relation with the activity that generated them as well as with the quantity of service/productsproduced. ,The methodology also should be capable of capture scale and scope economies due to shared resources or capacities optimization. Theproposed model combines the concepts of incremental costs andforward-looking costs in aflexible manner to enable the analysis of different projects regarding universal service
Mestrado
Automação
Mestre em Engenharia Elétrica
Zhou, Hong. "Integration of Analytical Models for Estimating Sediment Supply and Evaluation of Channel Stability." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1456273575.
Full textColombino, Jason C. "Can Educators Be Both Good and Successful?: The Relationship Between Socially Just (Good) and Successful Teaching." Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107425.
Full textThere is limited research on the relationship between socially just teaching practices and student achievement. While successful teaching is often defined through test scores, good teaching encompasses the moral elements of teaching (Fenstermacher & Richardson, 2005). This study, building on the work of Mitescu, Cochran-Smith, Pedulla, Cannady, and Jong (2011), is a secondary analysis examining the relationship between socially just teaching practices and student achievement. A subsample of 4th and 5th grade English/language arts (ELA) teachers (n=107) and students (n=2587) was taken from the Measures of Effective Teaching Longitudinal Database (Bill and Melinda Gates Foundation, 2013). Classroom videos were coded using the Teaching for Social Justice Observation Scale (TSJOS) of the Reformed Teaching Observation Protocol-Plus (RTOP+) (Mitescu et al.) to measure socially just teaching practices. Unadjusted linear regression analyses indicated a positive significant correlation between teachers’ mean TSJOS score and the class averages on standardized state ELA exams and the class average on an assessment of higher-order thinking skills. This relationship was also found when the same analysis was conducted on 4th grade classrooms as well as 5th grade classrooms. A hierarchical multiple linear regression found a positive significant relationship between TSJOS scores and student achievement after accounting for location, teacher, and student predictor variables. The relationship between socially just teaching practices and student achievement for subgroups of students is discussed. The study analyzed the significance and magnitude of the relationship between socially just teaching practices after two widely used classroom observation protocols, the Framework for Teaching (FfT) and the Protocol for Language Arts Observation Scale (PLATO), were entered into the model. Teacher mean TSJOS scores were found to explain a significant and unique proportion of the variation in state assessment scores after accounting for average FfT ELA observation scores and teacher average PLATO observation scores, separately. This study adds to the literature on the connection between socially just teaching practices and student achievement, in that it provides compelling evidence that socially just teaching practices are not only related to the good, or moral, side of teaching, but also have a positive and significant relationship with increased student achievement for all students
Thesis (PhD) — Boston College, 2017
Submitted to: Boston College. Lynch School of Education
Discipline: Teacher Education, Special Education, Curriculum and Instruction
Cox, Christopher 1967. "Watershed master planning for St. Lucia using geographic information systems." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27303.
Full textBarabucci, Gioele <1982>. "A universal delta model." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5761/.
Full textFalk, Matthew Gregory. "Incorporating uncertainty in environmental models informed by imagery." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33235/1/Matthew_Falk_Thesis.pdf.
Full textAlbertazzi, Ugo. "Essays in banking." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209878.
Full textLe premier Chapitre analyse empiriquement comment la capacité d’offrir des emprunts à long terme est influencée par la dimension des intermédiaires financiers.
Le deuxième Chapitre analyse, avec un model théorique caractérisé par la présence de soft-budget constraint, ratchet effect et short-termism, comment la pression compétitive influence la capacité des banque de financer le firmes ayant des projets de bonne qualité.
Le troisième Chapitre examine, avec un model théorique du type moral hazard common agency, le conflits d'intérêts des banques universelles.
Financial intermediaries are recognized to promote the efficiency of resource allocation by mitigating problems of incentives, asymmetric information and contract incompleteness. The role played by financial intermediaries is considered so crucial that these institutions have received all over the world the greatest attention of regulators.
Across and within banking sectors it is possible to observe a wide variety of intermediaries. Banks may differ in their size, market power and degree of specialization. This variety raises interesting questions about the features of a well functioning banking sector. These questions have inspired an important body of economic literature which, however, is still inconclusive in many aspects. This dissertation includes three studies intending to contribute in this direction.
Chapter 1 will empirically study the willingness of smaller and larger lenders to grant long-term loans which, as credit to SME's, constitute an opaque segment of the credit market. Chapter 2 analyzes, with a theoretical model, the effects of competition on the efficiency of the banking sector when this is characterized by dynamic commitment issues which brings to excessive refinancing of bad quality investments (so called soft-budget constraint) or excessive termination of good ones (ratchet effect and short-termism). Chapter 3 presents a model to investigate to what extent the distortions posed by conflicts of interest in universal banks can be addressed through the provision of appropriate incentive schemes by the different categories of clients.
Doctorat en Sciences économiques et de gestion
info:eu-repo/semantics/nonPublished
Hällgren, Tomas. "Phenomenological studies of dimensional deconstruction." Licentiate thesis, KTH, Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-567.
Full textIn this thesis, two applications of dimensional deconstruction are studied. The first application is a model for neutrino oscillations in the presence of a large decon- structed extra dimension. In the second application, Kaluza{Klein dark matter from a latticized universal extra dimension is studied. The goal of these projects have been twofold. First, to see whether it is possible to reproduce the relevant features of the higher-dimensional continuum theory, and second, to examine the effect of the latticization in experiments. In addition, an introduction to the the- ory of dimensional deconstruction as well as to the theory of continuous extra dimensions is given. Furthermore, the various higher-dimensional models, such as Arkani-Hamed{Dvali{Dimopolous (ADD) models and models with universal extra dimensions, that have been intensively studied in recent years, are discussed.
Dechant, Pierre-Philippe. "Models of the early universe." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609618.
Full textRohr, Alexander. "A universal realizability model for sequential functional computation." Phd thesis, [S.l.] : [s.n.], 2003. http://elib.tu-darmstadt.de/diss/000351.
Full textShafieian, Mehdi. "Toward a Universal Constitutive Model for Brain Tissue." Diss., Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/204511.
Full textPh.D.
Several efforts have been made in the past half century to characterize the behavior of brain tissue under different modes of loading and deformation rates; however each developed model has been associated with limitations. This dissertation aims at addressing the non-linear and rate dependent behavior of brain tissue specially in high strain rates (above 100 s-1) that represents the loading conditions occurring in blast induced neurotrauma (BINT) and development of a universal constitutive model for brain tissue that describes the tissue mechanical behavior from medium to high loading rates.. In order to evaluate the nature of nonlinearity of brain tissue, bovine brain samples (n=30) were tested under shear stress-relaxation loading with medium strain rate of 10 s-1 at strain levels ranging from 2% to 40% and the isochronous stress strain curves at 0,1 s and 10 s after the peak force formed. This approach enabled verification of the applicability of the quasilinear viscoelastic (QLV) theory to brain tissue and derivation of its elastic function based on the physics of the material rather than relying solely on curve fitting. The results confirmed that the QLV theory is an acceptable approximation for engineering shear strain levels below 40% that is beyond the level of axonal injury and the shape of the instantaneous elastic response was determined to be a 5th order odd polynomial with instantaneous linear shear modulus of 3.48±0.18 kPa. To investigate the rate dependent behavior of brain tissue at high strain rates, a novel experimental setup was developed and bovine brain samples (n=25) were tested at strain rates of 90, 120, 500, 600 and 800 s-1 and the resulting deformation and shear force were recorded. The stress-strain relationships showed significant rate dependency at high rates and was characterized using a QLV model with a 739 s-1 decay rate and validated with finite element analysis. The results showed the brain instantaneous elastic response can be modeled with a 3rd order odd polynomial and the instantaneous linear shear modulus was 19.2±1.1 kPa. A universal constitutive model was developed by combining the models developed for medium and high rate deformations and based on the QLV theory, in which the relaxation function has 5 time constants for 5 orders of magnitude in time (from 1 ms to 10 s) and therefore, is capable of predicting the brain tissue behavior in a wide range of deformation rates. Although the universal model presented in this study was developed based on only shear tests and the material parameters could not be found uniquely, by comparing the results of this study with previously available data in the literature under tension unique material parameters were determined for a 5 parameter generalized Rivlin elastic function (C10=3.208±0.602 kPa, C01=4.191±1.074 kPa, C11=79.898±18.974 kPa, C20=-37.093±7.273 kPa, C02=-37.712±5.678 kPa). The universal constitutive model for brain tissue presented in this dissertation is capable of characterizing the brain tissue behavior under large deformation in a wide range of strain rates and can be used in computational modeling of Traumatic Brain Injury (TBI) to predict injuries that result from falls and sports to automotive accidents and BINT.
Temple University--Theses
Chang, Tzy-hey H. "A universal relation data model with semantic constructs." Thesis, Boston University, 1988. https://hdl.handle.net/2144/38016.
Full textPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
This thesis describes a modularized universal relation data model, called URMSC (Universal Relation Data Model with Semantic Constructs). This model incorporates concepts from the semantic data model, such as the notions of entities, aggregation abstractions and generalization/specialization abstractions, into the universal relation data model. These semantic constructs allow us to reduce multiple paths among relation and allow us to loosen some of the constraints that the URM imposes. Consequently, a larger class of queries can be interpreted unambiguously. Modules are defined by aggregation hierarchies. Each module must satisfy the local unique name and attr£bute correlat£on assumptions. The former requires the uniqueness of attribute names on each individual module instead of the entire database scheme, to reduce the number of attribute renamings. The latter is used to disambiguate a query interpretation when there are duplicate attribute names in a database. In a universal relation system, data retrieval queries are expressed by mentioning only the attribute names of interest and their values. We extend this idea to the notion of database update. By taking advantage of the semantic constructs of the model, we provide criteria that guarantee unambiguous interpretation of update requests.
2031-01-01
Batista, Ronaldo Carlotto. "Soluções atratoras e isocurvatura em modelos de energia escura." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-08052014-142702/.
Full textRecent astrophysical observations, specially supernova type Ia and cosmic microwave back ground anisotropies, indicate that recently in the history of the universe, some unknown type of energy is dominating its evolution and inducing an accelerated expansion. This mysterious component has been named dark energy. Our aim is to study dark energy, by using cosmological constant, canonical scalar field and Born-Infeld scalar field models. In the models with scalar field, using power law potentials, we study attractor solutions for the homogeneous evolution. We also study, in the large scale approximation, attractor solutions for the scalar field perturbations. We show that, for models with canonical sca lar field , the attractor solutions for its perturbations do not generate isocurvature modes. For the Born-Infeld scalar field, we analyze the stability of its attractor solutions in the perturbative levei, and we determine in which case they can generate isocurvature modes. For the more realistic dark energy models, these modes tend to be small.
Skordis, Constantinos. "The accelerating universe : models and consequences /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.
Full textMimoso, Jose Pedro. "Cosmological models of the early universe." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358557.
Full textBelkasmi, Mohammed. "Contributions à la théorie des modèles positive." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00733592.
Full textUski, V., B. Mehlig, R. A. Romer, and M. Schreiber. "Smoothed universal correlations in the two-dimensional Anderson model." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199801066.
Full textChen, Nuo. "A Model of Universal Manual Design for Technical Products." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259195.
Full textTill skillnad från ständigt utvecklande konsumentteknik och konsumentelektronik som har blivit billigare och mer intuitiva att använda, de medföljande manualerna använder fortfarande den gamla bokliknande design. Det finns människor som inte läser manual när de har funderingar eller frågor, eftersom manualen kanske är för komplicerad eller svårbegriplig. Det finns också människor som inte kan använda manualen, på grund av lässvårigheter eller analfabetism. Sådana problem kan lösas med en universell design för manual (UDM) på digitala plattformer. Universell design är en design strategi som syftar på att göra produkten lika tillgänglig och användbar för alla. Dock fanns det ingen sådan design på marknaden.Denna forskning syftade på att undersöka vad det är som krävs för UDM och sedan utveckla en model för det. Målet var att förslå en model för UDM (MUDM) som beskriver hur manual kan designas på digitala plattformer, för att uppnå universell tillgänglighet och användbarhet.Forskningsmetoden var kvalitativ och utforskande. Genom att studera relevanta litteratur, forskningsrapporter och existerande manualer med hög nivå av användbarhet, en lista med kraven för UDM skapades och analyserades. Därefter skapades en model av UDM baserat på upptäckterna från studierna.Modellen beskriver en implementering av manual som mobilapplikation på smartphones. Modellen består av två diagram, ett flödesdiagram och ett paketdiagram. Diagrammen omfattar interaktionsmetoder, layouter, komponenter, navigeringen och metoder för informationspresentation. Modellen täcker också all kraven för UDM, vilket vill säga den innehåller metoder för att uppfylla samtliga kraven.
Sánchez, Lamelas Francisco Javier. "Universal Media Measurement: Desarrollo de un nuevo modelo para la mediación universal y homogénea de los medios publicitarios." Doctoral thesis, Universitat Ramon Llull, 2020. http://hdl.handle.net/10803/669742.
Full textLa irrupción de los medios digitales ha supuesto un cambio de paradigma en las estrategias de marketing de las empresas, que cuentan hoy con la posibilidad (o necesidad) de combinar diferentes medios, plataformas y canales en su labor de comunicación. Sin embargo, no existe en la actualidad un sistema que permita llevar a cabo una comparación fiable del valor de cada impacto proveniente de cada uno de los distintos medios, dificultando a los profesionales del marketing el tomar decisiones informadas sobre la mejor combinación posible de medios para sus campañas. En la presente tesis se pretende dar respuesta a dicha problemática, proponiéndose para ello un modelo de medición de medios que, mediante la evaluación de la calidad de los impactos en función de las características de cada uno de los medios y del sector en el que se enmarquen, hace comparables impactos que, a priori, no lo son, evaluando además la calidad global de todo el esfuerzo publicitario de la marca o empresa que corresponda.
The irruption of digital media has meant a paradigm shift in the marketing strategies of companies, who now have the possibility (or need) to combine different media, platforms and channels in their communication effort. However, there is currently no system that allows for a reliable comparison of the value of each impact from each of the different media, making it difficult for marketers to make informed decisions about the best possible combination of media for their campaigns. This thesis aims to give a possible solution to this problem. A measurement model is proposed evaluates the quality of the impacts based on the characteristics of each of the media and the sector in which it is used. This makes it possible to compare impacts thatmay not seem comparable at first sight. Moreover, the model can also be used to evaluate the overall quality of all the advertising effort of the brand or company.
Bachar, Idriss Saleh. "Approches d'évaluation de l'accès universel et stratégies d’optimisation : Application au cas de l' Afrique centrale." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0098/document.
Full textThis thesis deals systematically with the analysis of the situation of ICTs in Central Africa, it identifies the problems related to universal access and studies ICTs harmonization policies. This analysis then enables the proposal of an integrated target mapping to reduce the digital divide. Not only the different optical and radio broadband technologies are used but described to relate the basic concepts allowing to apprehend the advantages and disadvantages of each technology. This allowed us to propose a methodological approach to modeling the universal access and service indicator coupled with an optimization strategy revealing, on the one hand, the technological gap to be filled and on the other hand, predicting the access level based on technologies to achieve in accordance with the investment policies of the Universal Service Fund. Besides the proposal of this modeling approach, other contributions of this thesis is developing a network model architecture based on radio technologies and proposing a methodology consisting of integrating the various parameters involved in the choice of technologies to be deployed for access and universal service. In addition, it is projected into the future evolution of solutions that leads to hybrid technologies
Groussin, Mathieu. "Résurrection du passé à l’aide de modèles hétérogènes d’évolution des séquences protéiques." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10201/document.
Full textThe molecular reconstruction and resurrection of ancestral proteins is the major issue tackled in this thesis manuscript. While fossil molecular data are almost nonexistent, phylogenetic methods allow to estimate what were the most likely ancestral protein sequences along a phylogenetic tree describing the relationships between extant sequences. With these ancestral sequences, several biological hypotheses can be tested, from the evolution of protein function to the inference of ancient environments in which the ancestors were adatapted. These probabilistic estimations of ancestral sequences depend on substitution models giving the different probabilities of substitution between all pairs of amino acids. Classicaly, substitution models assume in a simplistic way that the evolutionary process remains homogeneous (constant) among sites of the multiple sequence alignment or between lineages. During the last decade, several methodological improvements were realised, with the description of substitution models allowing to account for the heterogeneity of the process among sites and in time. During my thesis, I developed new heterogeneous substitution models in Maximum Likelihood that were proved to better fit the data than any other homogeneous or heterogeneous models. I also demonstrated their better performance regarding the accuracy of ancestral sequence reconstruction. With the use of these models to reconstruct or resurrect ancestral proteins, my coworkers and I showed the adapation to temperature is a major determinant of evolutionary rates in Archaea. Furthermore, we also deciphed the nature of the phylogenetic signal informing substitution models to infer a non-parsimonious scenario for the adaptation to temperature during early Life on Earth, with a non-hyperthermophilic last universal common ancestor living at lower temperatures than its two descendants. Finally, we showed that the use of heterogeneous models allow to improve the functionality of resurrected proteins, opening the way to a better understanding of evolutionary mechanisms acting on biological sequences
Berndsen, Aaron. "String theoretic models of the early universe." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18674.
Full textCette th\èse explore la physique du jeune univers. Nous utilisons la th\'eorie des cordes pour nous aider \à comprendre l'\'epoque pr\'ec\'edant la nucl\'eosynth\èse. Deux manuscrits sont present\'es: un concernant la cosmologie de gaz de cordes (string gas cosmology, SGC), et un concernant le sc\'enario d'un univers membrane (brane world, BW). Nous pla\cons des contraintes sur la stabilization du moduli et du dilaton dans la construction SGC. Puis, nous \'etudions l\'epoque du r\'echauffement de l'univers dans la construction BW, et nous pla\c{c}ons des contraintes sur les param\ètres fundamentaux de la th\'eorie des cordes.
Allen, Laura. "Cosmological perturbations : constraining models of the universe." Thesis, University of Portsmouth, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439040.
Full textParsons, Paul. "Scalar-field models of the early universe." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390077.
Full textNguyen, Mai. "Empirical Evaluation of a Universal Requirements Engineering Process Maturity Model." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4011.
Full textBelli, Giacomo. "Thermodynamics and scattering in 2D for 4D theories." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23212/.
Full textHumphreys, Neil Paul. "Obervational analysis of the inhomogeneous universe." Thesis, University of Portsmouth, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310380.
Full textGavrilovich, Misha. "Model theory of the universal covering spaces of complex algebraic varieties." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711602.
Full textChoi, Wai-fung. "Reheating the universe in brane world cosmological models." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39376795.
Full textChoi, Wai-fung, and 蔡偉峰. "Reheating the universe in brane world cosmological models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39376795.
Full textBleninger, Tobias. "Coupled 3D hydrodynamic models for submarine outfalls environmental hydraulic design and control of multiport diffusers." Karlsruhe Univ.-Verl. Karlsruhe, 2006. http://www.uvka.de/univerlag/volltexte/2007/238/.
Full textBleninger, Tobias. "Coupled 3D hydrodynamic models for submarine outfalls environmental hydraulic design and control of multiport diffusers /." Karlsruhe : Universitätsverlag, 2007. http://www.uvka.de/univerlag/volltexte/2007/238/.
Full textSchön, Astrid. "Modellierung von turbulenten Kohlenwasserstoff-Sauerstoff-Diffusionsflammen und deren Beeinflussung durch reaktionstechnische Parameter." Karlsruhe : Univ.-Verl. Karlsruhe, 2005. http://www.uvka.de/univerlag/volltexte/2006/126/.
Full textGockel, Tilo. "Interaktive 3D-Modellerfassung mittels One-Shot-Musterprojektion und schneller Registrierung." Karlsruhe : Univ.-Verl. Karlsruhe, 2005. http://www.uvka.de/univerlag/volltexte/2006/153/.
Full textGuimaraes, Luiz Galliza. "Estudo de comportamento crítico não universal em modelo de ising com defeitos." Universidade de São Paulo, 1986. http://www.teses.usp.br/teses/disponiveis/54/54131/tde-17062015-194451/.
Full textWe study quantum analogs of two-dimensional Ising models with a linear defect. Conformal invariance and scaling arguments are used to relate the expoent nH* to a finite chain mass-gap ratio. Close agreement is found with the pertinent exact results