Partición hardware software de un codificador JPEG utilizando escalador de colinas estocástico

La partición hardware/software es una etapa clave dentro del proceso de co-diseño de los sistemas embebidos. En esta etapa se decide qué componentes serán implementados como co-procesadores de hardware y qué componentes serán implementados en un procesador de propósito general. La decisión es tomada a partir de la exploración del espacio de diseño, evaluando un conjunto de posibles soluciones para establecer cuál de estas es la que mejor balance logra entre todas las métricas de diseño. Para explorar el espacio de soluciones, la mayoría de las propuestas, utilizan algoritmos metaheurísticos; destacándose los Algoritmos Genéticos, Recocido Simulado. Esta decisión, en muchos casos, no es tomada a partir de análisis comparativos que involucren a varios algoritmos sobre un mismo problema. En este trabajo se presenta la aplicación de los algoritmos: Escalador de Colinas Estocástico y Escalador de Colinas Estocástico con Reinicio, para resolver el problema de la partición hardware/software. Para validar el empleo de estos algoritmos se presenta la aplicación de este algoritmo sobre un caso de estudio, en particular la partición hardware/software de un codificador JPEG. En todos los experimentos es posible apreciar que ambos algoritmos alcanzan soluciones comparables con las obtenidas por los algoritmos utilizados con más frecuencia.

Essays in dynamic optimal taxation: working experience, unemployment scarring and poverty

This thesis investigates the design of optimal tax systems in dynamic environments. The first essay characterizes the optimal tax system where wages depend on stochastic shocks and work experience. In addition to redistributive and efficiency motives, the taxation of inexperienced workers depends on a second-best requirement that encourages work experience, a social insurance motive and incentive effects. Calibrations using U.S. data yield higher expected optimal marginal income tax rates for experienced workers for most of the inexperienced workers. They confirm that the average marginal income tax rate increases (decreases) with age when shocks and work experience are substitutes (complements). Finally, more variability in experienced workers' earnings prospects leads to increasing tax rates since income taxation acts as a social insurance mechanism. In the second essay, the properties of an optimal tax system are investigated in a dynamic private information economy where labor market frictions create unemployment that destroys workers' human capital. A two-skill type model is considered where wages and employment are endogenous. I find that the optimal tax system distorts the first-period wages of all workers below their efficient levels which leads to more employment. The standard no-distortion-at-the-top result no longer holds due to the combination of private information and the destruction of human capital. I show this result analytically under the Maximin social welfare function and confirm it numerically for a general social welfare function. I also investigate the use of a training program and job creation subsidies. The final essay analyzes the optimal linear tax system when there is a population of individuals whose perceptions of savings are linked to their disposable income and their family background through family cultural transmission. Aside from the standard equity/efficiency trade-off, taxes account for the endogeneity of perceptions through two channels. First, taxing labor decreases income, which decreases the perception of savings through time. Second, taxation on savings corrects for the misperceptions of workers and thus savings and labor decisions. Numerical simulations confirm that behavioral issues push labor income taxes upward to finance saving subsidies. Government transfers to individuals are also decreased to finance those same subsidies.

Learning from the Nordic welfare model: what and how? EU Centre Singapore Working Paper No. 16, September 2013

This paper posits that the Nordic countries were able to ensure good standards of equality for its citizens, while at the same time maintaining decent levels of economic growth. This can be attributed to the Nordic countries’ more holistic approach towards social spending and their focus on uplifting the skill levels of its workforce. Thus, the notion that there must be a trade-off between economic performance and a more aggressive welfare regime should be examined more thoroughly. The debate for policy makers should perhaps be framed with regard to where the balance should be between growth and equity rather than a trade-off. Firstly, the paper will elaborate on what exactly the “Nordic model” is, based on a broad literature review. Next, the paper will unpack the key characteristics of the Nordic model and analyse if indeed expansive welfare provided through state support erodes work ethic and impact the economic competitiveness of countries. Next, the paper will provide an explanation for how the balance between economic and social objectives is maintained, in some of the Nordic countries. Lastly, the paper discusses whether the same balance can be achieved in Singapore.

Discretion and Accountability: The ESMA Judgment and the Meroni Doctrine. Bruges European Economic Research (BEER) Papers 30/2014

This paper assesses the effectiveness of the Meroni doctrine in the light of the recent judgment in the ESMA case. The first part explains in detail the problem of delegation of powers in the EU from the perspective of the principal-agent theory and complements it with the analysis of the trade-off between different levels of independence and accountability of agencies. A simple economic model is developed to illustrated the relationship between the independence and accountability of an agency. It shows that it is the accountability mechanism that induces the agent to act, rather than the extent of his independence. The paper also explains the inter-temporal interactions between the principal and the agent on the basis of the incentives in place for the different players. The second part is devoted to analysis of the functioning of ESMA in the context of its delegated powers. After the presentation of main aspects of the regulatory framework establishing ESMA, the paper continuous with an analysis and interpretation of the discretionary powers of ESMA. The rather rigid position of the Court of Justice in relation to the Meroni doctrine seems to be unsuitable to delegation of complex regulatory tasks. This is particularly evident in the case of financial markets. Finally, the judgment does not examine in any detail whether and how the principals - i.e. the EU and Member States - are best able to evaluate the quality of ESMA decisions and regulations and whether there are different but more effective accountability mechanisms.

The CAP post-2013: more equitable, green and market-oriented? Based on the seminar held by Egmont on the 25th of November. European Policy Brief No. 5, December 2011

Following a seminar on the CAP post- 2013 held by Egmont - with the cooperation of the Polish Presidency - on the 25th of November 2011, Egmont commissioned the present policy brief. Three major policy issues were addressed at this occasion, namely; how to make the CAP more equitable, green and market-oriented? The trade-off between these policy issues will require policy choices that are worthy of analysis.

Falling Labor Share and Rising Unemployment: Long-Run Consequences of Institutional Shocks? CES Germany & Europe Working Papers, No. 00.2, 1999

The literature on unemployment has mostly focused on labor market issues while the impact of capital foonation is largely neglected Job-creation is often thought to be a matter of encouraging more employment on a given capital stock. In contrast, this paper explicitly deals with the long-run consequences of institutional shocks on capital foonation and employment. It is shown that the usual trade off between employment and wages disappears in the long run. In line with an appropriation model, the estimated values for the long-run elasticities of substitution between capital and labor for Germany and France are substantially greater than one.

Drosophila melanogaster larvae make nutritional choices that minimize developmental time

Organisms from slime moulds to humans carefully regulate their macronutrient intake to optimize a wide range of life history characters including survival, stress resistance, and reproductive success. However, life history characters often differ in their response to nutrition, forcing organisms to make foraging decisions while balancing the trade-offs between these effects. To date, we have a limited understanding of how the nutritional environment shapes the relationship between life history characters and foraging decisions. To gain insight into the problem, we used a geometric framework for nutrition to assess how the protein and carbohydrate content of the larval diet affected key life history traits in the fruit fly, Drosophila melanogaster. In no-choice assays, survival from egg to pupae, female and male body size, and ovariole number - a proxy for female fecundity - were maximized at the highest protein to carbohydrate (P:C) ratio (1.5:1). In contrast, development time was minimized at intermediate P:C ratios, around 1:2. Next, we subjected larvae to two-choice tests to determine how they regulated their protein and carbohydrate intake in relation to these life history traits. Our results show that larvae targeted their consumption to P:C ratios that minimized development time. Finally, we examined whether adult females also chose to lay their eggs in the P:C ratios that minimized developmental time. Using a three-choice assay, we found that adult females preferentially laid their eggs in food P:C ratios that were suboptimal for all larval life history traits. Our results demonstrate that D. melanogaster larvae make foraging decisions that trade-off developmental time with body size, ovariole number, and survival. In addition, adult females make oviposition decisions that do not appear to benefit the larvae. We propose that these decisions may reflect the living nature of the larval nutritional environment in rotting fruit. These studies illustrate the interaction between the nutritional environment, life history traits, and foraging choices in D. melanogaster, and lend insight into the ecology of their foraging decisions.

Socioemotional Wealth, Ambidexterity, and Family Firm Performance: An Empirical Study

While family business literature agrees that family firms are driven by both non-economic and financial motives, it is unclear how the prioritization of socioemotional wealth (SEW) over financial considerations affects family firms' financial performance. Based on a sample of 343 family firm owners from German-speaking Europe, this study reveals a significant and positive relationship between the firm owners' SEW considerations and their family businesses' financial performance. This relationship, in turn, is found to be mediated by organizational ambidexterity. A fine-grained analysis of the different SEW dimensions indicates that this pattern may be driven by two elements of socioemotional wealth only (family members' identification with the firm and emotional attachment). Our findings demonstrate that business families do not necessarily face a trade-off when prioritizing the preservation of their SEW over stabilizing or improving the financial performance of their business. The study enriches several streams of literature and opens up numerous avenues for future research.

Designing defense systems /

Cover title: Designing defense systems, the trade-off process.

Dynamic, convex, and robust optimization with Bayesian learning for response-guided dosing

Thesis (Ph.D.)--University of Washington, 2016-08

On Managing Stochastic Decentralized Projects

Thesis (Ph.D.)--University of Washington, 2016-06

Towards Accurate and Efficient Description of Excited States

Thesis (Ph.D.)--University of Washington, 2016-06

Optimal debt, endogenous fertility, and human capital externalities in a model with altruistic bequests

and human capital externalities. Because of such externalities, education investment is too low and fertility is too high. While education subsidies are the conventional means to deal with these problems, we show that the optimal policy also comprises debt even when distortionary taxes are used. The reason is that debt tips the usual trade-off between children's quantity and quality in favor of the latter by increasing the bequest cost of children. The optimal debt-output ratio exceeds 10% for plausible parameterization. (C) 2002 Elsevier B.V. All rights reserved.

Optimal price regulation in a growth model with monopolistic suppliers of intermediate goods

In this paper we investigate the trade-off faced by regulators who must set a price for an intermediate good somewhere between the marginal cost and the monopoly price. We utilize a growth model with monopolistic suppliers of intermediate goods. Investment in innovation is required to produce a new intermediate good. Marginal cost pricing deters innovation, while monopoly pricing maximizes innovation and economic growth at the cost of some static inefficiency. We demonstrate the existence of a second-best price above the marginal cost but below the monopoly price, which maximizes consumer welfare. Simulation results suggest that substantial reductions in consumption, production, growth, and welfare occur where regulators focus on static efficiency issues by setting prices at or near marginal cost.

Coloured oil droplets enhance colour discrimination

The eyes of most diurnal reptiles and birds contain coloured retinal filters-oil droplets. Although these filters are widespread, their adaptive advantage remains uncertain. To understand why coloured oil droplets appeared and were retained during evolution, I consider both the benefits and the costs of light filtering in the retina. Oil droplets decrease cone quantum catch and reduce the overlap in sensitivity between spectrally adjacent cones. The reduction of spectral overlap increases the volume occupied by object colours in a cone space, whereas the decrease in quantum catch increases noise, and thus reduces the discriminability of similar colours. The trade-off between these two effects determines the total benefit of oil droplets. Calculations show that coloured oil droplets increase the number of object colours that can be discriminated, and thus are beneficial for colour vision.