Freddy Rojas

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The drive for greater detail in scientific computing and digital photography is creating demand for ultra-resolution images and visualizations. Such images are best viewed on large displays with enough resolution to show “big picture” relationships concurrently with fine-grained details. Historically, large scale displays have been rare due to the high(More)
This paper develops new, far more extensive estimates of export quality, covering 178 countries and hundreds of products over 1962–2010. Quality upgrading is particularly rapid during the early stages of development, with quality convergence largely completed as a country reaches upper middle-income status. There is significant cross-country heterogeneity(More)
This article proposes the fusion of two important paradigms, Genetic Algorithms and the Blind Separation of Sources (GABSS). Although the topic of BSS, by means of various techniques, including ICA, PCA and neural networks, has been amply discussed in the literature, to date the possibility of using genetic algorithms has not been explored. However, in(More)
High-resolution display environments consisting of many individual displays arrayed to form a single visible surface are commonly used to present large scale data. Using these displays often involves a control paradigm where interactions become cumbersome and non-intuitive. By combining highresolution displays with multi-touch and gesture interactive(More)
This paper proposes the fusion of two important paradigms, Genetic Algorithms and the Blind Separation of Sources in Nonlinear Mixtures (GABSS). Although the topic of BSS, by means of various techniques, including ICA, PCA, and neural networks, has been amply discussed in the literature, the possibility of using genetic algorithms has not been explored thus(More)
We build a two country asymmetric DSGEmodel with two features: (i) a product cycle structure determines the range of intermediate goods used to produce new capital in each country and (ii) there are investment ‡ow adjustment costs in the developing economy. We calibrate the model to match the Mexico-US trade and FDI ‡ows. The model is able to explain (i)(More)
Business cycle fluctuations in developed economies (N) tend to have large and persistent effects on developing countries (S). We study the transmission of business cycle fluctuations for developed to developing economies with a two-country asymmetric DSGE model with two features: (i) endogenous development of new technologies in N , and (ii) sunk costs of(More)
Using a sample of 110 developed and developing countries for the period 1990-2004 we analyze the empirical characteristics of systemic sudden stops (3S) in capital flows --understood as large and largely unexpected capital account contractions that occur in periods of systemic turmoil -and the relevance of balance sheet effects in the likelihood of their(More)
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