Dissertations / Theses on the topic 'Parametrized'
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Shah, Jay (Jay Hungfai Gautam). "Parametrized higher category theory." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112894.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 99).
We develop foundations for the category theory of [infinity]-categories parametrized by a base occategory. Our main contribution is a theory of parametrized homotopy limits and colimits, which recovers and extends the Dotto-Moi theory of G-colimits for G a finite group when the base is chosen to be the orbit category of G. We apply this theory to show that the G-[infinity]-category of G-spaces is freely generated under G-colimits by the contractible G-space, thereby affirming a conjecture of Mike Hill.
by Jay Shah.
Ph. D.
Dever, Christopher W. (Christopher Walden) 1972. "Parametrized maneuvers for autonomous vehicles." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30328.
Includes bibliographical references (p. 197-209).
This thesis presents a method for creating continuously parametrized maneuver classes for autonomous vehicles. These classes provide useful tools for motion planners, bundling sets of related vehicle motions based on a low-dimensional parameter vector that describes the fundamental high-level variations within the trajectory set. The method follows from a relaxation of nonlinear parametric programming necessary conditions that discards the objective function, leaving a simple coordinatized feasible space including all dynamically admissible vehicle motions. A trajectory interpolation algorithm uses projection and integration methods to create the classes, starting from arbitrary user-provided maneuver examples, including those obtained from standard nonlinear optimization or motion capture of human-piloted vehicle flights. The interpolation process, which can be employed for real-time trajectory generation, efficiently creates entire maneuver sets satisfying nonlinear equations of motion and nonlinear state and control constraints without resorting to iterative optimization. Experimental application to a three degree-of-freedom rotorcraft testbed and the design of a stable feedforward control framework demonstrates the essential features of the method on actual hardware. Integration of the trajectory classes into an existing hybrid system motion planning framework illustrates the use of parametrized maneuvers for solving vehicle guidance problems. The earlier relaxation of strict optimality conditions makes possible the imposition of affine state transformation constraints, allowing maneuver sets to fit easily into a mixed integer-linear programming path planner.
(cont.) The combined scheme generalizes previous planning techniques based on fixed, invariant representations of vehicle equilibrium states and maneuver elements. The method therefore increases the richness of available guidance solutions while maintaining problem tractability associated with hierarchical system models. Application of the framework to one and two-dimensional path planning examples demonstrates its usefulness in practical autonomous vehicle guidance scenarios.
by Christopher Walden Dever.
Ph.D.
Seiß, Matthias [Verfasser]. "Root parametrized differential equations / Matthias Seiß." Kassel : Universitätsbibliothek Kassel, 2012. http://d-nb.info/1028081170/34.
Nguyen, T. A. "Introducing parametrized statetransition descriptions into communicating processes." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61716.
Knutsen, Henrik Holenbakken. "Enhancing Software Portability with Hardware Parametrized Autotuning." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24568.
Eftang, Jens Lohne. "Reduced basis methods for parametrized partial differential equations." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for matematiske fag, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12550.
Rakowska, Joanna. "Tracing parametrized optima for inequality constrained nonlinear minimization problems." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39714.
Kuai, Le. "Parametrized Finite Element Simulation of Multi-Storey Timber Structures." Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-66825.
Li, Chengbo. "Parametrized Curves in Lagrange Grassmannians and Sub-Riemannian Geometry." Doctoral thesis, SISSA, 2009. http://hdl.handle.net/20.500.11767/4625.
Sung, Yih. "Holomorphically parametrized L2 Cramer's rule and its algebraic geometric applications." Thesis, Harvard University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3567083.
Suppose f,g1,[special characters omitted] ,gp are holomorphic functions over Ω ⊂ [special characters omitted]n. Then there raises a natural question: when can we find holomorphic functions h1, [special characters omitted] , hp such that f = Σg jhj? The celebrated Skoda theorem solves this question and gives a L2 sufficient condition. In general, we can consider the vector bundle case, i.e. to determine the sufficient condition of solving fi(x) = Σ gij(x)h j(x) with parameter x ∈ Ω. Since the problem is related to solving linear equations, the answer naturally connects to the Cramer's rule. In the first part we will give a proof of division theorem by projectivization technique and study the generalized fundamental inequalities. In the second part we will apply the skills and the results of the division theorems to show some applications.
Rovas, Dimitrios V. (Dimitrios Vasileios) 1975. "Reduced-basis output bound methods for parametrized partial differential equations." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/16956.
Includes bibliographical references (p. 189-200).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
An efficient and reliable method for the prediction of outputs of interest of partial differential equations with affine parameter dependence is presented. To achieve efficiency we employ the reduced-basis method: a weighted residual Galerkin-type method, where the solution is projected onto low-dimensional spaces with certain problem-specific approximation properties. Reliability is obtained by a posteriori error estimation methods - relaxations of the standard error-residual equation that provide inexpensive but sharp and rigorous bounds for the error in outputs of interest. Special affine parameter dependence of the differential operator is exploited to develop a two-stage off-line/on-line blackbox computational procedure. In the on-line stage, for every new parameter value, we calculate the output of interest and an associated error bound. The computational complexity of the on-line stage of the procedure scales only with the dimension of the reduced-basis space and the parametric complexity of the partial differential operator; the method is thus ideally suited for the repeated and rapid evaluations required in the context of parameter estimation, design, optimization, and real-time control. The theory and corroborating numerical results are presented for: symmetric coercive problems (e.g. problems in conduction heat transfer), parabolic problems (e.g. unsteady heat transfer), noncoercive problems (e.g. the reduced-wave, or Helmholtz, equation), the Stokes problem (e.g flow of highly viscous fluids), and certain nonlinear equations (e.g. eigenvalue problems).
by Dimitrios V. Rovas.
Ph.D.
Bullock, Bennett (Bennett Charles). "Auditory pathway responses to parametrized vowels in autism spectrum disorders." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/63225.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 78-84).
Autism spectrum disorder (ASD) is characterized by many behavioral symptoms, including delays in social and communicative development. A cluster of symptoms concentrate on speech and language development, especially manipulation of non-verbal information conveyed in prosody. It is largely unknown whether this is due to functional or structural differences in the brain regions involved in auditory and speech processing, although recent studies have shown that ASD individuals do exhibit different activation patterns in various brain regions in response to speech stimuli. This study investigated responses in regions of the auditory pathway to short recorded and synthesized vowel stimuli. These regions were the Inferior Colliculus, the Left Thalamus, the left Posterior Insula, the Auditory Cortex, Wernicke's area, and Broca's area. The stimuli were parametrized so as to target different signal processing capabilities associated with each region. They were presented to ASD and typically developing (TD) subjects while the salient regions were subject to a functional magnetic resonance imaging (fMRI). The results suggest that there were not gross differences in how ASD individuals responded from TD individuals in the subcortical regions. Results from the Auditory Cortex, however, showed a significant hemisphere dominance in TD subjects with more temporally complex stimuli that did not appear in ASD subjects. Moreover, the results showed that it was temporally-measured periodicities in the signal that were responsible for this difference. The results also show slightly different activation patterns in cortical regions which could have implications for attentiveness, and semantic and emotional processing. These results suggest that deficiencies in the temporal processing capabilities of the left Auditory Cortex play a major role in ASD speech processing.
byBennett Bullock.
S.M.
Singh, Balraj. "A parametrized CAD tool for VHDL model development with X Windows." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03242009-040819/.
Houlis, Pantazis Constantine. "A novel parametrized controller reduction technique based on different closed-loop configurations." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0052.
Gerner, Anna-Lena [Verfasser]. "Certified reduced basis methods for parametrized saddle point problems / Anna-Lena Gerner." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1028004850/34.
Mustu, Erkan [Verfasser]. "Dynamical behavior of a parametrized family of one-dimensional maps / Erkan Mustu." Gießen : Universitätsbibliothek, 2018. http://d-nb.info/1172202133/34.
Brittell, Megen. "Improving Accessibility of Spatial Information: A Technique Using Parametrized Audio to Symbolize Lines." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/12168.
Graphics provide a rich display medium that facilitates identification of spatial patterns but are inaccessible to people who are blind or low vision. Audio provides an alternative medium through which to display information. Prior research has explored audio display of lines representing functions and location of screen objects within a graphical user interface; however, presentation of spatial attributes of lines (angle, number of segments, etc.) of geographic data has received limited attention. This thesis explores a theoretical foundation for designing audio displays and presents an experimental evaluation of line symbology. Sighted users who were blindfolded and blind users performed a line following task and a matching task to evaluate the line symbology. Observed differences between the conditions did not reach statistical significance. User preferences and observed strategies are discussed.
Committee in charge: Dr. Michal Young, Chair
Letona, Bolivar Cristina Felicitas. "On a Class of Parametrized Domain Optimization Problems with Mixed Boundary Condition Types." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/73308.
Ph. D.
Gonçalves, Cilene Maria Marques. "Método para gestão do custo da construção no processo de projeto de edificações." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-06052011-134259/.
The civil construction industry has cycling characteristic and low profitability; therefore, the markup can be easily affected. The Real Estate companies profit depend on the accuracy of the cost defined at the time of the decision to buy the site and still, that the cost variance between the moment of the decision to undertake the project and its conclusion be little, in order do not affect the expected return. A weakness was observed in civil engineering field related to cost definition at the business feasibility phase and to the cost support in the decisions making during the design process. What is practice in the market is the cost based on the area (built, private or equivalent) having as a reference the final costs of previous projects. After this first cost, another evaluation will be done when the design was approved by the municipality and the sales have begun. At this moment, the construction company gives the first cost, but it will be reliable only after all drawings are at least at the basic level. The cost at that phase could surprise in a negative manner if the cost analyzes were not carefully done. What intends in this dissertation is to present a simple and effective parameterization method, with promptitude and agility to make engineering value analyzes and architectural decisions, supported by the construction cost parameterization described at the only work break down spread sheet, from the beginning of the business process to the end of construction phase, contributing for process traceability, to facilitate each phase analyze and for budgeting process feedback.
Slaats, Michaela [Verfasser]. "Infinite regular games in the higher-order pushdown and the parametrized setting / Michaela Slaats." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1019646411/34.
Hermanson, Leon. "Stochastic physics : a comparative study of parametrized temperature tendencies in a global atmospheric model." Thesis, University of Reading, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434337.
Suzuki, Takeru. "Strong Resultatives as a Bounded PathPP Construction: PathPP Structure and Parametrized Path Head Movement." University of Arizona Linguistics Circle, 2012. http://hdl.handle.net/10150/253426.
Pazman, Andrej. "Elimination of less informative design points in regression models with a known or parametrized covariance function." Institut für Statistik und Mathematik, WU Vienna University of Economics and Business, 2005. http://epub.wu.ac.at/856/1/document.pdf.
Series: Research Report Series / Department of Statistics and Mathematics
Tonn, Timo [Verfasser]. "Reduced-Basis Method (RBM) for Non-Affine Elliptic Parametrized PDEs : (Motivated by Optimization in Hydromechanics) / Timo Tonn." Ulm : Universität Ulm. Fakultät für Mathematik und Wirtschaftswissenschaften, 2012. http://d-nb.info/1026992222/34.
Bonanati, Peter [Verfasser]. "A parametrized numerical model to simulate the semiconductor influence of thick film metal oxide gas sensors / Peter Bonanati." Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1220689831/34.
Kärcher, Mark Verfasser], Martin A. [Akademischer Betreuer] [Grepl, Stefan Akademischer Betreuer] Volkwein, and Arnold [Akademischer Betreuer] [Reusken. "Certified reduced basis methods for parametrized PDE-constrained optimization problems / Mark Kärcher ; Martin Alexander Grepl, Stefan Volkwein, Arnold Reusken." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130403033/34.
Kärcher, Mark [Verfasser], Martin A. [Akademischer Betreuer] Grepl, Stefan Akademischer Betreuer] Volkwein, and Arnold [Akademischer Betreuer] [Reusken. "Certified reduced basis methods for parametrized PDE-constrained optimization problems / Mark Kärcher ; Martin Alexander Grepl, Stefan Volkwein, Arnold Reusken." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130403033/34.
Melo, Samara Pereira da Costa. "Especifica??o do tipo intervalar parametrizado em CASL." Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18057.
The interval datatype applications in several areas is important to construct a interval type reusable, i.e., a interval constructor can be applied to any datatype and get intervals this datatype. Since the interval is, of certain form, a set of elements limited for two bounds, left and right, with a order notions, then it s reasonable that interval constructor enclose datatypes with partial order. On the order hand, what we want is work with interval of any datatype like this we work with this datatype then. it s important to guarantee the properties of the datatype when maps to interval of this datatype. Thus, the interval constructor get a theory to parametrized interval type, i.e., a interval with generics parameters (for example rational, real, complex). Sometimes, the interval application in some algebras doesn t guarantee the mainutenance of their properties, for example, when we use interval of real, that satisfies the field properties, it doesn t guarantee the distributivity propertie. A form to surpass this problem Santiago introduced the local equality theory that weakened the notion of strong equality, and thus, allowing some properties are local keeped, what can be discard before. The interval arithmetic generalization aim to apply the interval constructor on ordered algebras weakened for local equality with the purpose of the keep their properties. How the intervals are important in applications with continuous data, it s interesting specify that theory using a specification language that supply a system development using intervals of form disciplined, trustworth and safe. Currently, the algebraic specification language, based in math models, have been use to that intention often. We choose CASL (Common Algebraic Specification Language) among others languages because CASL has several characteristics excellent to parametrized interval type, such as, provide parcialiy and parametrization
O uso do tipo intervalar em v?rias ?reas favorece a id?ia de se ter uma estrutura b?sica reutiliz?vel, ou seja, um construtor intervalar que seja aplicado a um tipo de dados para se obter os intervalos desse tipo. Como um intervalo, intuitivamente ? o conjunto de elementos que est?o entre dois extremos, sua constru??o presup?e a no??o de ordem, e portanto ? razo?vel que este construtor trabalhe sobre tipos munidos de uma ordem parcial. Por outro lado, como o que se quer ? operar com intervalos de objetos de um certo tipo como se opera com esses objetos, ent?o tamb?m ? razo?vel querer que as propriedades alg?bricas desses objetos sejam preservadas no seu tipo intervalar. Assim, o construtor intervalar fornece uma fundamenta??o te?rica para o tipo intervalo parametrizado, ou seja, intervalos cujo par?metro ? generalizado podendo ser, por exemplo, n?meros reais, complexos, etc. A aplica??o do intervalo em certas estruturas alg?bricas nem sempre garante a preserva??o de suas caracter?sticas, por exemplo, quando se trabalha com intervalos de n?meros reais, seria conveniente que estes pudessem se comportar como se fossem os reais. Isto n?o acontece pois os reais satisfazem as propriedades alg?bricas de corpo, j? os intervalos de reais n?o (por exemplo, n?o suporta a propriedade distributiva). Para superar esta dificuldade Santiago introduziu a teoria da igualdade local numa forma de enfraquecer a no??o de igualdade forte fazendo com que propriedades satisfeitas localmente sejam relevantes, propriedades estas que antes poderiam ser descartadas. A generaliza??o da aritm?tica intervalar prop?e a aplica??o do construtor intervalar em estruturas alg?bricas ordenadas e enfraquecidas pela igualdade local, objetivando a manuten??o de suas propriedades alg?bricas. Como os intervalos s?o importantes em aplica??es que trabalhem com dados cont?nuos, ? interessante descrever esta teoria usando uma linguagem de especifica??o que permita o desenvolvimento de sistemas computacionais que usem tipos intervalares de modo disciplinado, confi?vel e seguro. Atualmente, as linguagens de especifica??es alg?bricas, que se baseiam em modelos matem?ticos, t?m sido muito usadas para este proposito. Dentre as v?rias linguagens deste tipo existentes, foi escolhida CASL (Common Algebraic Specification Language) por conter diversas caracter?sticas relevantes para especifica??o do tipo intervalar parametrizado como, por exemplo, admitir parametriza??o e parcialidade
Pazman, Andrej. "Correlated optimum design with parametrized covariance function. Justification of the Fisher information matrix and of the method of virtual noise." Institut für Statistik und Mathematik, WU Vienna University of Economics and Business, 2004. http://epub.wu.ac.at/562/1/document.pdf.
Series: Research Report Series / Department of Statistics and Mathematics
Sageman-Furnas, Andrew O'Shea [Verfasser], Max [Akademischer Betreuer] Wardetzky, Viktor [Gutachter] Pidstrygach, and Alexander [Gutachter] Bobenko. "A theory of discrete parametrized surfaces in R^3 / Andrew O'Shea Sageman-Furnas ; Gutachter: Viktor Pidstrygach, Alexander Bobenko ; Betreuer: Max Wardetzky." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://d-nb.info/1163806102/34.
Peherstorfer, Benjamin [Verfasser], Hans-Joachim [Akademischer Betreuer] Bungartz, and Karen [Akademischer Betreuer] Willcox. "Model Order Reduction of Parametrized Systems with Sparse Grid Learning Techniques / Benjamin Peherstorfer. Gutachter: Hans-Joachim Bungartz ; Karen Willcox. Betreuer: Hans-Joachim Bungartz." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1043587519/34.
Peherstorfer, Benjamin Verfasser], Hans-Joachim [Akademischer Betreuer] [Bungartz, and Karen [Akademischer Betreuer] Willcox. "Model Order Reduction of Parametrized Systems with Sparse Grid Learning Techniques / Benjamin Peherstorfer. Gutachter: Hans-Joachim Bungartz ; Karen Willcox. Betreuer: Hans-Joachim Bungartz." München : Universitätsbibliothek der TU München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20130918-1163421-0-8.
Peherstorfer, Benjamin Verfasser], Hans-Joachim [Akademischer Betreuer] Bungartz, and Karen [Akademischer Betreuer] [Willcox. "Model Order Reduction of Parametrized Systems with Sparse Grid Learning Techniques / Benjamin Peherstorfer. Gutachter: Hans-Joachim Bungartz ; Karen Willcox. Betreuer: Hans-Joachim Bungartz." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1043587519/34.
Frasca, M. "GRAPH-BASED APPROACHES FOR IMBALANCED DATA IN FUNCTIONAL GENOMICS." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/172445.
Bader, Eduard [Verfasser], Karen [Akademischer Betreuer] Veroy, and Michael [Akademischer Betreuer] Herty. "Reduced basis methods applied to obstacle problems and parametrized distributed optimal control problems with control and state constraints / Eduard Bader ; Karen Paula Veroy-Grepl, Michael Matthias Herty." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/115712237X/34.
Akbaba, Esin. "Einstein Aether Gravity." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610898/index.pdf.
del type metrics are also exact solutions of this theory. Furthermore, we determine the observational constraints on the dimensionless preferred parameters of this theory using the parametrized post- Newtonian formalism. We stress that none of calculations and discussions are original in this thesis.
Gonçalves, Marco Aurélio da Fontoura. "UM ESTUDO SOBRE IMPLEMENTAÇÃO DE CICLOS DE USINAGEM ATRAVÉS DE PROGRAMAÇÃO PARAMETRIZADA EM MÁQUINAS DE COMANDO NUMÉRICO COMPUTADORIZADO." Universidade Federal de Santa Maria, 2007. http://repositorio.ufsm.br/handle/1/8419.
As máquinas de comando numérico computadorizado (CNC) são programáveis e possuem funções que facilitam a obtenção de diferentes superfícies com geometria variada na manufatura de peças mecânicas. Este trabalho tem como finalidade apresentar uma metodologia de aplicação dos recursos avançados de programação no desenvolvimento de rotinas parametrizadas dedicadas ao processo de fresamento. A programação parametrizada mostrou-se uma ferramenta eficaz para criar ciclos de usinagem a serem implementados como recursos adicionais às funções de programação disponíveis no comando da máquina. Por usar recursos tradicionais de programação, a técnica reduz o número de linhas de códigos em relação aos métodos computacionais de geração automática de programas de operação do equipamento. O trabalho mostrou que a técnica de programação parametrizada aumenta a eficiência operacional da máquina, através do aumento dos recursos de programação, agregando maior valor na utilização da mesma para realizar operações produtivas
Heyberger, Christophe. "PGD espace-temps adaptée pour le traitement de problèmes paramétrés." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2014. http://tel.archives-ouvertes.fr/tel-01048636.
Meier, Arne [Verfasser]. "Parametrised enumeration / Arne Meier." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1206685859/34.
GIUNTI, BARBARA. "Tame parametrised chain complexes." Doctoral thesis, Università degli studi di Pavia, 2019. http://hdl.handle.net/11571/1291606.
Hyytinen, M. (Markus). "Parametrien estimointi." Bachelor's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201605201826.
Luk, W. "Parametrised design of regular processor arrays." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329919.
Alamäki, M. (Markku). "Parametrinen resonanssi ja vahvistus." Bachelor's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201606032252.
In my thesis I discuss parametric resonance and its applications. Parametric resonance stands for an instability phenomenon where oscillations in a system get amplified due to a periodic change in a parameter in the equations of motion. Concerning parametric resonance, I discuss especially Mathieu’s equation, Floquet (or Bloch) theorem and strength of resonance. Based on the presented theory I calculate the characteristic exponent for different solutions of the Mathieu’s equation and discuss the relation between strength of resonance and characteristic exponent. Concerning the applications, I discuss parametric amplifiers, especially the two-tank parametric amplifier
Junior, Wivaldo Dantas de Asevedo. "Modelo Ionosférico Regional Parametrizado." Instituto Nacional de Pesquisas Espaciais, 2009. http://urlib.net/sid.inpe.br/mtc-m18@80/2009/03.24.17.56.
In this work a parametrized regional ionospheric model (PARIM) was developed and used to calculate spatial and temporal variations of ionospheric plasma frequency and electron concentration over Brazilian sector. Values of plasma frequency calculated from an enhanced Sheffield University Plasmasphere Ionosphere Model (SUPIM) was used to construct the model. The PARIM is a parametrized model with dependencies in altitude, longitude (local time) and latitude, giving values of plasma frequency for any day of the year for quiet geomagnetic conditions (Ap~4) and low to moderately high solar activity (FI0.7 between 66 and 180). The procedure to reproduce the initial data base, uses Fourier series so that all the plasma frequency dependencies can be represented by the Fourier coefficients. In general. the plasma frequency values obtained with PARIM model shows excellent agreement with results from SUPIM model. In comparison with results from COPEX campaign, the model shows good agreement but it needs improvements. The values of criticai frequency for the ionospheric E layer obtained with PARIM are in good agreement with COPEX campaign data. The values of hmE over Cachimbo shows coherence with COPEX campaign measurements, but over Boa Vista and Campo Grande during evening time there is not good agreement. The parameters foF2 calculated over Cachimbo are in agreement with the data, but their are overestimated over Boa Vista and Campo Grande during day time. The values of hmF2 calculated for Boa Vista and Campo Grande show good agreement with COPEX campaign data, but over equatorial sector the values from PARIM show inconsistencies between 12:00 and 16:00 (local time). The explanation to this inconsistencies may be connected with the occurrence of F3 layer. The values of Total Electron Content (TEC) calculated by P ARIM are overestimated in comparison with the observational data from COPEX, during the day and early evening time. The differences are more noticeable near 16 LT.
SOUZA, Leandro Carlos de. "Agrupamento e regressão linear de dados simbólicos intervalares baseados em novas representações." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17640.
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Um intervalo é um tipo de dado complexo usado na agregação de informações ou na representação de dados imprecisos. Este trabalho apresenta duas novas representações para intervalos com o objetivo de se construir novos métodos de agrupamento e regressão linear para este tipo de dado. O agrupamento por nuvens dinâmicas define partições nos dados e associa protótipos a cada uma destas partições. Os protótipos resumem a informação das partições e são usados na minimização de um critério que depende de uma distância, responsável por quantificar a proximidade entre instâncias e protótipos. Neste sentido, propõe-se a formulação de uma nova distância híbrida entre intervalos baseando-se em distâncias para pontos. Os pontos utilizados são obtidos dos intervalos através de um mapeamento. Também são propostas duas versões com pesos para a distância criada: uma com pesos no hibridismo e outra com pesos adaptativos. Na regressão linear, propõe-se a representação dos intervalos através da equação paramétrica da reta. Esta parametrização permite o ajuste dos pontos nas variáveis regressoras que dão as melhores estimativas para os limites da variável resposta. Antes da realização da regressão, um critério é calculado para a verificação da coerência matemática da predição, na qual o limite superior deve ser maior ou igual ao inferior. Se o critério mostra que a coerência não é garantida, propõe-se a aplicação de uma transformação sobre a variável resposta. Assim, este trabalho também propõe algumas transformações que podem ser aplicadas a dados intervalares, no contexto de regressão. Dados sintéticos e reais são utilizados para comparar os métodos provenientes das representações propostas e aqueles presentes na literatura.
An interval is a complex data type used in the information aggregation or in the representation of imprecise data. This work presents two new representations of intervals in order to construct a new cluster method and a new linear regression method for this kind of data. Dynamic clustering defines partitions into the data and it defines prototypes associated with each one of these partitions. The prototypes summarize the information about the partitions and they are used in a minimization criterion which depends on a distance, which is responsible for quantifying the proximity between instances and prototypes. In this way, it is proposed a new hybrid distance between intervals based on a family of distances between points. Points are obtained from the interval through a mapping. Also, it is proposed two versions of the hybrid distance, both with weights: one with weights in hybridism and other with adaptive weights. In linear regression, it is proposed to represent the intervals through the parametric equation of the line. This parametrization allows to find the set of points in the regression variables corresponding to the best estimates for the response variable limits. Before the regression construction, a criterion is computed to verify the mathematical consistency of prediction, where the upper limit must be greater than or equal to the lower. If the test shows that consistency is not guaranteed, then the application proposes a transformation of the response variable. Therefore, this work also proposes some transformations that can be applied to interval data in the regression context. Synthetic and real data are used to compare the proposed methods and those one proposed on literature.
Efremov, Semen. "Croissance paramétrée et bruit procédural pour la conception de métamatériaux mécaniques." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0046.
With constant development of technologies, computational and manufacturing capabilities increase, production methods evolve, and new techniques appear. As a result, the need for new materials with tailored, optimized properties for different applications arises. Periodic composites with tailored microstructure topology, called cellular metamaterials are extensively studied in this context. These structures are known for their remarkable mechanical properties, including high strength, lower weight, and increased energy absorption. The use of these materials allows to achieve improved physical properties or specific functional features and provides economical gain and ecological benefit.This thesis is dedicated to the development and analysis of methods for computer-aided design of materials with tailored mechanical properties. The mechanical metamaterials were studied through two different approaches: modelling periodic structures through a parameterized growth model and procedural noise functions. To tackle the challenge of obtaining near-regular microstructures with progressively varying properties, I proposed and studied a cellular material spawned by a growth process. The growth is parameterized by a 3D star-shaped set at each lattice point, defining the geometry that will appear around it. Individual tiles may be computed and used in a periodic lattice, or a global structure may be produced under spatial gradations, changing the parametric star-shaped set at each lattice location. Beyond free spatial gradation, an important advantage of this approach is that elastic symmetries can be intrinsically enforced. It is shown in this work how shared symmetries between the lattice and the star-shaped set directly translate into symmetries of the periodic structures' elastic response. Thus, the approach enables restricting the symmetry of the elastic responses -- monoclinic, orthorhombic, trigonal, and so on -- while freely exploring a wide space of possible geometries and topologies. I provide a comprehensive study of the space of symmetries and broad combinations of growth process parameters. Furthermore, I demonstrate through numerical and experimental results the expected responses triggered by the obtained structures.The second contribution of this thesis is a novel procedural pattern synthesis technique. This approach exhibits desirable properties for modeling highly contrasted patterns, that are well suited to produce surface and microstructure details. This approach defines a stochastic smooth phase field –- a phasor noise –- that is then fed into a periodic function (e.g. a sine wave), producing an oscillating field with prescribed main frequencies and preserved contrast oscillations. I present in this thesis a mathematical model, that builds upon a reformulation of Gabor noise in terms of a phasor field that affords for a clear separation between local intensity and phase. In particular, I study the behavior of phasor noise in terms of its power spectrum. Hence, a comparative theoretical study of phasor noise was performed in order to gain understanding of links between its properties and parameters
Välipirtti, I. (Iida). "Inversio-ongelmasta ja parametrien estimoinnista." Bachelor's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201905071612.
Silva, Nayara Rosy Felix da. "Geração multi-parametrizada de corpora linguísticos." Universidade Federal de Sergipe, 2015. https://ri.ufs.br/handle/riufs/3364.
Não informado.
O desenvolvimento de software de Processamento de Linguagem Natural (PLN) é altamente dependente da boa qualidade do que chamamos de corpus Linguístico. Um corpus é uma coleção de textos processáveis pelo computador, mas produzidos dentro de um ambiente comunicativo natural. Essa dependência advém do fato de que a maior parte do trabalho realizado com PLN hoje em dia está relacionado ao uso de técnicas de Aprendizado de Máquina para criação de modelos de linguagem. Para sistemas que permitem correção automática e previsão de palavras e sentenças, por exemplo, modelos linguísticos são gerados a partir de um corpus de texto a partir de transcrições usando N-Gram. Infelizmente, corpora linguísticos em português do Brasil não são abundantes e sua confecção não é uma tarefa trivial. Um caminho para a confecção de corpus linguísticos em Português é a confecção de CrawlersWeb. Focused Crawlers, em particular, têm o propósito de coletar páginas da Web que sejam relevantes a um tópico ou interesse específico do usuário. FocusedCrawlers existentes ainda não atendem completamente a necessidades específicas e toda potencialidade de um sistema de PLN. Esta dissertação de mestrado se propõe a contribuir com o Estado da Arte ao propor uma ferramenta para a confecção automática de corpora bem representativos ao objetivo do usuário que possam ser balanceados em respeito a fatores tais como tipo de coleta, domínio, língua, formalidade do discurso e rotulação do texto. A ferramenta permite ainda que etapas de pós-processamento sejam realizadas, como por exemplo limpeza do corpus, construção de um modelo de linguagem e de um modelo de entidades nomeadas. Dois corpora foram criados em duas formas de coleta distintas: por dados da Web (corpus Vaza- Barris) ou por dados do Twitter (corpus Poxim). O corpus VazaBarris possui 86 milhões de palavras e o Poxim possui 3 milhões de palavras. Estes corpora foram avaliados por meio da criação de modelo de linguagem e comparação com dois outros corpora em Português. Os resultados mostram que Poxim alcançou o melhor valor de perplexidade. Poxim também traz maior contribuição quando interpolado com algum outro corpus. Além dos corpora, foi criado um método de coleta automática para streaming de dados, utilizando o algoritmo de Relevance Feedback. Segundo os resultados, utilizar Relevance Feedback para a coleta dos dados melhorou o valor de perplexidade com o corpus coletado inicialmente. Um terceiro corpus foi criado para rotulação de Entidades Nomeadas, o Paramopama. O Paramopama é uma versão estendida PtBR do corpus WikiNer, com inclusão das entidades Pessoa, Localização, Organização e Tempo. Os resultados mostram que o Paramopama apresentou melhoria para as métricas de Precisão, Cobertura e Medida-F na comparação com outros três corpora do Estado da Arte.
Vähänen, P. (Paavo). "Parametrisen suunnittelun hyödyntäminen teräsbetonisten runkorakenteiden luonnossuunnittelussa." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201906042312.
Luminiitty, L. (Liljastiina). "Asuinkerrostalon pohjien parametrinen suunnittelu evolutiivisin menetelmin." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201909272942.