Orientador: Sergio Antonio Tozoni / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica / Made available in DSpace on 2018-08-25T19:58:00Z (GMT). No. of bitstreams: 1 Stabile_RegisLeandroBraguim_D.pdf: 1552111 bytes, checksum: af2b74d1076ee2c6dd825049748fd3fd (MD5) Previous issue date: 2014 / Resumo: As teorias de n-larguras e de entropia foram introduzidas por Kolmogorov na década de 1930. Desde então, muitos trabalhos têm visado obter estimativas assintóticas para n-larguras e números de entropia de diferentes classes de conjuntos. Neste trabalho, investigamos n-larguras e números de entropia de operadores multiplicadores definidos sobre o toro d-dimensional. Na primeira parte, estabelecemos estimativas inferiores e superiores para n-larguras e números de entropia de operadores multiplicadores gerais. Na segunda parte, aplicamos estes resultados para operadores multiplicadores específicos, associados a conjuntos de funções finitamente e infinitamente diferenciáveis sobre o toro. Em particular, demonstramos que as estimativas obtidas são exatas em termos de ordem em diversas situações / Abstract: The theories of n-widths and entropy were introduced by Kolmogorov in the 1930s. Since then, many works aims to find estimates for n-widths and entropy numbers of different classes of sets. In this work, we investigate n-widths and entropy numbers of multiplier operators defined on the d-dimensional torus. In the first part, upper and lower bounds are established for n-widths and entropy numbers of general multiplier operators. In the second part, we apply these results to specific multiplier operators, associated with sets of finitely and infinitely differentiable functions on the torus. In particular, we prove that, the estimates obtained are order sharp in various situations / Doutorado / Matematica / Doutor em Matemática

Submitted by Rodrigo Abreu (rodrigo.fea@hotmail.com) on 2012-12-19T16:46:04Z No. of bitstreams: 1 Fiscal_Multipliers_final_19122012.pdf: 610827 bytes, checksum: 9524182b559dc768fd1e52b1b19e872b (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2013-01-18T17:10:51Z (GMT) No. of bitstreams: 1 Fiscal_Multipliers_final_19122012.pdf: 610827 bytes, checksum: 9524182b559dc768fd1e52b1b19e872b (MD5) / Made available in DSpace on 2013-01-18T17:11:15Z (GMT). No. of bitstreams: 1 Fiscal_Multipliers_final_19122012.pdf: 610827 bytes, checksum: 9524182b559dc768fd1e52b1b19e872b (MD5) Previous issue date: 2012-09-19 / This paper studies the behavior of fiscal multipliers in two different economic environments: complete markets and incomplete markets. Based on steady state analysis, output multipliers are found within a range between 0.49 and 0.66, when the markets are complete. Under incomplete markets, output multiplier was found in an interval between 0.75 and 0.94. These results indicates that the market structure, which reflects the degree of risk sharing and the intensity of the precautionary motive faced by individuals, plays a key role in determining the fiscal multipliers. In the second part of the paper, was performed an exercise to analyze the dynamic response of macroeconomic aggregates to an exogenous and unexpected rise in government spending financed by lump-sum taxes. In this case, impact output multipliers varies in a range between 0.64 and 0.68, under complete markets, and within 1.05 and 1.20 when markets are incomplete. The results found under incomplete markets are very close to that found on related literature which usually uses an econometric approach or calibrated/estimated New Keynesian models. These results shows that taking into account the deficiencies in the insurance mechanisms can be an interesting way to reconcile theoretical models with the results found on related current literature, without the need of ad-hoc assumptions relative to price stickness. / Este artigo estuda o comportamento dos multiplicadores fiscais em dois ambientes Econômicos distintos: mercados completos e incompletos. Com base na análise do estado estacionário de ambas economias, são encontrados multiplicadores do produto em um intervalo entre 0:49 e 0:66, quando os mercados são completos. Quando os mercados são incompletos, o multiplicador do produto encontrado ficou em um intervalo entre 0:75 e 0:94. Estes resultados indicam que a estrutura de mercado, que reflete o nível de compartilhamento de risco e o grau do motivo precaucionário enfrentado pelos indivíduos, desempenha um papel fundamental na determinação dos multiplicadores fiscais. Na segunda parte do artigo, foi realizado exercício para analisar a resposta dinâmica dos agregados macroeconômicos em relação a um aumento exógeno e inesperado dos gastos do governo financiado por meio de impostos lump-sum. Neste caso, os multiplicadores de impacto sobre o produto ficaram entre 0:64 e 0:68, quando os mercados são completos, e entre 1:05 e 1:20 quando os mercados são incompletos. Os resultados obtidos _a partir da análise dinâmica sob mercados incompletos ficaram bastante próximos daqueles encontrados na literatura relacionada, que geralmente obtém multiplicadores dessa magnitude usando uma abordagem econométrica ou por meio de modelos Novo Keynesianos. Estes resultados mostram que levar em consideração as deficiências nos mecanismos de seguro podem ser uma forma interessante de reconciliar os modelos teóricos com os resultados encontrados na literatura relacionada, sem a necessidade de adotar hipóteses ad-hoc sobre a estrutura da rigidez de preços.

The aim of this diploma thesis is to determine the objectivized value of CHÂTEAU VALTICE Vinné sklepy Valtice, a.s. while maintaining its current business concept as of 31.12.2015. The thesis is divided into several thematic units in accordance with the es-tablished valuation practice in the Czech Republic. First, the company is introduced and its financial health and competitive position on the market are assessed. The forecast of market share and revenue growth is based on the results of Strategic Analysis. The anal-ysis and prognosis of value generators are then used to compile a financial plan that forms the basis for a DCF equity valuation, which is complemented by a market-based valuation through industry multipliers method and also by substance-based valuation.

The PhD thesis considers four topics in dynamical systems and is based on one paper and three manuscripts. In Paper I we apply methods of interval analysis in order to compute the rigorous enclosure of rotation number. The described algorithm is supplemented with a method of proving the existence of periodic points which is used to check rationality of the rotation number. In Manuscript II we provide a numerical algorithm for computing critical points of the multiplier map for the quadratic family (i.e., points where the derivative of the multiplier with respect to the complex parameter vanishes). Manuscript III concerns continued fractions of quadratic irrationals. We show that the generating function corresponding to the sequence of denominators of the best rational approximants of a quadratic irrational is a rational function with integer coefficients. As a corollary we can compute the Lévy constant of any quadratic irrational explicitly in terms of its partial quotients. Finally, in Manuscript IV we develop a method for finding rigorous enclosures of all odd periodic solutions of the stationary Kuramoto-Sivashinsky equation. The problem is reduced to a bounded, finite-dimensional constraint satisfaction problem whose solution gives the desired information about the original problem. Developed approach allows us to exclude the regions in L2, where no solution can exist.

The advance of information and communication technology speeds up year by year. At the same time, methodologies for objective measurement of the benefits of ICTs are still lacking behind. This difference then forms a void of unsatisfied information requirements about the state of ICTs from a business as well as national economy's point of view. This thesis summarizes theoretical background about possible ways of viewing and measuring ICT benefits (be that benefits for a person, society as a whole or economy as a whole). The practical part of the thesis analyzes data describing the state of ICT sector in the Czech economy. The first part looks at ways of measuring ICT benefits as they are seen by a number of other authors and described in many studies. This provides a summary of the possibilities to consider when looking at our topic. The second part uses conclusions from previous works on similar topics to set some recommendations for policy improvement as well as social development that will enable maximizing the achieved utility of ICTs. Third part evaluates the position of ICT sector in the Czech Republic by analyzing basic statistical data about the economic and employment impact of all ICT firms as a whole. This is compared to other sectors of the Czech economy. Last part provides a detailed description of the process to calculate output and employment multipliers for all the sectors of Czech economy and then calculates these values according to the process. In the end, there is a summary of the theoretical and practical findings described in all preceding chapters.

Thesis deals with a fiscal policy issue with emphasis on the debt crisis. First specifics of the data capture of the government sector for the purpose of evaluating the fiscal position are analyzed. It includes assessment of the fiscal sustainability indicators and the historical reaction function of fiscal policy in the EU. The analysis of cyclical adjustment of the government balance, definition of fiscal impulse and the estimation of fiscal multipliers in the Czech Republic precedes the contribution to the debate regarding the optimal fiscal policy setup with respect to debt sustainability in the long run and sufficient degree of flexibility in the short run. The thesis concludes with the identification of the causes of the fiscal debt crises with the subsequent analysis of possible ways to resolve the already existing fiscal imbalances and assessing the appropriateness of the Czech government's consolidation.

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<p>  </p> <p>This dissertation is composed of three independent chapters in the field of the economic geography and international trade. However, there is one uniting theme between all three chapters: geographic spillovers. In each chapter, a source of geographic spillovers that is relevant to policymakers is investigated. Further, each chapter addresses a theoretical or data-driven challenge to identifying these spillovers and implements an improved methodology for estimation. In particular, the first chapter studies agglomeration and congestion spillovers, the impact of employment density on the productivity of workers and the amenities associated with living in a location, respectively, by using variation from a natural experiment. The second chapter studies fiscal multipliers, the effect of government spending on economic activity, by using variation from the same natural experiment. Finally, the third chapter studies import spillovers, the impact of neighboring firms' experience sourcing from foreign markets on the likelihood that firms in the same location and industry enter into those same markets, by using detailed data on Serbian firms.</p> <p><br></p> <p>In the first chapter, <em>Agglomeration and Congestion Spillovers: Evidence from Base Realignment and Closure</em>, I quantify agglomeration and congestion spillovers using variation from a natural experiment by instrumenting for changes in local employment with proposed changes to civilian employment at military installations through the Base Realignment and Closure (BRAC) process. I find an agglomeration spillover elasticity consistent with the existing literature. However, my estimate of the congestion spillover elasticity is smaller in magnitude than common parameterizations of quantitative economic geography models. All else equal, with a weaker congestion spillover elasticity, more of the distribution of economic activity across space is due to natural advantages and disadvantages. This result implies smaller gains from implementing the optimal spatial policy. </p> <p><br></p> <p>In the second chapter, <em>Local Fiscal Multipliers and Defense Spending</em>, I estimate county-level fiscal multipliers using shocks to military employment to instrument for local defense spending. Aggregate shocks to military employment are subject to the Base Realignment and Closure process, which is designed to isolate the recommendations of the Department of Defense from political influences. By exploiting variation in military employment, I address the endogeneity of government spending when using changes in defense spending to estimate fiscal multipliers. In addition, this method addresses the attenuation bias due to geographic measurement error that results from using data on military contracts alone with small geographic units. This extends the common method for estimating state- and national-level fiscal multipliers using variation in defense spending to more local geographic units. My estimates imply a local income multiplier between 0.5 and 0.8, which is smaller than existing estimates that use non-defense-based sources of variation, but larger than the existing estimates based on variation in defense contract spending. </p> <p><br></p> <p>In the third chapter, <em>International Sourcing and Firm Learning: Evidence from Serbian Firms</em>, we find that compared to non-importers, importers are more productive and pay higher wages as they source better quality and cheaper production inputs. However, little is known about how these firms learn about their sourcing markets. We quantify the impact of neighboring firms' importing experience on the decision to start sourcing inputs from new markets using merged customs and administrative data from Serbian firms. We find that firms are more likely to start importing from a new market if firms in the same industry and location have imported from that market and if those firms increased their imports over time. Further, our results support a distinction between imports and exports for the decision to enter foreign markets; unlike exports, import sourcing choices are not independent across countries, but are substitutes. We also investigate origin-country and firm heterogeneity. Our results indicate that the impact of neighboring firms' importing experience is greater for source countries in the European Union market and for firms that are high productivity, foreign owned, and previous importers. Together, these findings suggest that a firm's spatial connections are an important factor in its access to global markets as sources for inputs.</p>

This thesis focuses on the development and convergence study of finite element methods for eigenvalue analysis of arbitrarily shaped domains with multi-material and material-void interfaces. Such configurations can be found in problems with evolving discontinuities and interfaces as in fluid-structure interaction or topology optimization problems. The differential equations considered in this thesis include the elliptic operator, Timoshenko beam and Mindlin plate. The compatibility conditions at the interface are weakly imposed using either Nitsche's method or Lagrange multipliers. The variational statements are derived for each case. The analysis results are benchmarked using Galerkin finite element discretization with bodyitted grids. Nitsche's method shows a direct dependence on a penalty term and for Lagrange multipliers method, additional degrees of freedom are added to the solution vector. The convergence rate of the discretized forms is computationally determined and is shown to be optimal for both Timoshenko beams and Mindlin plates.