Anisotropic dispersion, space competition, and the slowdown of the Neolithic transition

The front speed of the Neolithic (farmer) spread in Europe decreased as it reached Northern latitudes, where the Mesolithic (huntergatherer) population density was higher. Here, we describe a reaction diffusion model with (i) an anisotropic dispersion kernel depending on the Mesolithic population density gradient and (ii) a modified population growth equation. Both effects are related to the space available for the Neolithic population. The model is able to explain the slowdown of the Neolithic front as observed from archaeological data

Label space reduction in GMPLs and All-Optical Label Swapping networks

All-Optical Label Swapping (AOLS) es una tecnología clave para la implementación de nodos de conmutación completamente óptica de paquetes. Sin embargo, el costo de su desarrollo es proporcional al tamaño del espacio de etiquetas (label space). Debido a que los principios de funcionamiento de AOLS son casos particulares de los del MultiProtocol Label Switching (MPLS), esta tesis estudia métodos generales, aplicables a ambos, con el propósito de reducir el espacio de etiquetas tanto como sea posible. Modelos de programación lineal entera y heurísticas son propuestos para el caso en el que se permite apilar una etiqueta extra. Encontramos que cerca del 50% del espacio de etiquetas puede ser reducido, si se permite colocar una etiqueta extra en la pila. Además, particularmente para AOLS, encontramos que se puede reducir el espacio de etiquetas cerca al 25% si se duplica la capacidad de los enlaces y se permite re-encaminar el tráfico.

Geostatistics for constrained variables: positive data, compositions and probabilities. Applications to environmental hazard monitoring

Aquesta tesi estudia com estimar la distribució de les variables regionalitzades l'espai mostral i l'escala de les quals admeten una estructura d'espai Euclidià. Apliquem el principi del treball en coordenades: triem una base ortonormal, fem estadística sobre les coordenades de les dades, i apliquem els output a la base per tal de recuperar un resultat en el mateix espai original. Aplicant-ho a les variables regionalitzades, obtenim una aproximació única consistent, que generalitza les conegudes propietats de les tècniques de kriging a diversos espais mostrals: dades reals, positives o composicionals (vectors de components positives amb suma constant) són tractades com casos particulars. D'aquesta manera, es generalitza la geostadística lineal, i s'ofereix solucions a coneguts problemes de la no-lineal, tot adaptant la mesura i els criteris de representativitat (i.e., mitjanes) a les dades tractades. L'estimador per a dades positives coincideix amb una mitjana geomètrica ponderada, equivalent a l'estimació de la mediana, sense cap dels problemes del clàssic kriging lognormal. El cas composicional ofereix solucions equivalents, però a més permet estimar vectors de probabilitat multinomial. Amb una aproximació bayesiana preliminar, el kriging de composicions esdevé també una alternativa consistent al kriging indicador. Aquesta tècnica s'empra per estimar funcions de probabilitat de variables qualsevol, malgrat que sovint ofereix estimacions negatives, cosa que s'evita amb l'alternativa proposada. La utilitat d'aquest conjunt de tècniques es comprova estudiant la contaminació per amoníac a una estació de control automàtic de la qualitat de l'aigua de la conca de la Tordera, i es conclou que només fent servir les tècniques proposades hom pot detectar en quins instants l'amoni es transforma en amoníac en una concentració superior a la legalment permesa.

Inovação da gestão escolar para a qualidade : o caso da educação pública municipal de Teresina - PIAUI

RESUMO: A qualidade da educação está sendo impactada pela falta de qualidade da gestão. Assim, apesar de saber-se que a qualidade da educação não está unicamente vinculada à qualidade da gestão escolar, já que o processo ensino-aprendizagem é permeado por uma grande diversidade de fatores, tais como, as práticas docentes, a presença da família e os recursos disponíveis, a gestão constitui-se em um dos fatores primordiais para a compreensão do desempenho da escola. A discussão acerca da qualidade da gestão escolar se faz necessária, portanto, no momento em que a educação brasileira clama pela sua qualidade. Acredita-se que entender os aspectos que envolvem a gestão escolar hoje existente no Brasil, mais especificamente no Piauí e mais diretamente no município de Teresina e a forma com que as escolas estão sendo efetivamente gerenciadas, poderá ajudar a compreender o fenômeno educacional e a melhoria da qualidade da formação promovida nas escolas brasileiras. Deste modo, tem-se como objetivo do estudo analisar como uma inovação da gestão escolar, de forma estratégica, aplicada nas escolas municipais de Teresina pode impactar na qualidade da Educação Básica municipal. Desta forma, o que se propõe, é estabelecer através da pesquisa de campo pontos positivos e negativos quanto ao modelo da gestão estratégica do ensino municipal, que possa ser um caminho para um modelo único de qualidade, na gestão da educação do Estado do Piauí. Concluiu-se que se faz necessário que o gestor da educação pública tenha o compromisso social de fazer da instituição que atua um espaço de transformação, para criar uma sociedade mais justa, mais humana e inclusiva, promovendo a liberdade, a autonomia e a melhoria da qualidade. ABSTRACT: The quality of education is being impacted by the lack of quality management. Thus, despite knowing that the quality of education is not solely linked to the quality of school management, as the teaching-learning process is permeated by a variety of factors, such as the teaching practices, the presence of family and available resources, the management is on a primary factor for the understanding of school performance. The discussion about the quality of school management is necessary, therefore, when it calls for the Brazilian education quality. It is believed that understanding the issues involving the school management that exists today in Brazil, specifically in Piauí and more directly in the city of Teresina and the way schools are being managed effectively, can help to understand the phenomenon and the improvement of educational quality promoted training in Brazilian schools. Thus, it has been the goal of the study to analyze how an innovation in school management, strategically applied in public schools of Teresina can impact the quality of basic education hall. Thus, what is proposed is to establish through research field positive and negative points about the model of strategic management and primary school, which can be a path to a single model of quality management education in the state of Piauí. It was concluded that it is necessary that the manager of public education has a social commitment to making the institution that operates a space of transformation, to create a fairer society, more humane and inclusive, promote freedom, autonomy and quality improvement.

Hemispheric asymmetries in recognition memory for negative and neutral words

Federmeier and Benjamin (2005) have suggested that semantic encoding for verbal information in the right hemisphere can be more effective when memory demands are higher. However, other studies (Kanske & Kotz, 2007) also suggest that visual word recognition differ in function of emotional valence. In this context, the present study was designed to evaluate the effects of retention level upon recognition memory processes for negative and neutral words. Sample consisted of 15 right-handed undergraduate portuguese students with normal or corrected to normal vision. Portuguese concrete negative and neutral words were selected in accordance to known linguistic capabilities of the right hemisphere. The participants were submitted to a visual half-field word presentation using a continuous recognition memory paradigm. Eye movements were continuously monitored with a Tobii T60 eye-tracker that showed no significant differences in fixations to negative and neutral words. Reaction times in word recognition suggest an overall advantage of negative words in comparison to the neutral words. Further analysis showed faster responses for negative words than for neutral words when were recognised at longer retention intervals for left-hemisphere encoding. Electrophysiological data through event related potentials revealed larger P2 amplitude over centro-posterior electrode sites for words studied in the left hemifield suggesting a priming effect for right-hemisphere encoding. Overall data suggest different hemispheric memory strategies for the semantic encoding of negative and neutral words.

The community museum: a space for the exercise of communal power

This paper discusses two key elements in the field of museums: a summary of the concept of the community museum, on the one hand, and, on the other, a proposal as to how this concept is put into practice, especially in the early stages of the creation of the museum, when the social basis for the project is being established. We will discuss how the community museum combines and integrates complex processes aimed at strengthening the community as a collective subject, asserting its identity, improving its quality of life and building alliances between communities. In the second part, which has a methodological focus, we will discuss how the museum is born out of community aspirations to strengthen its identity and integrity, the initial process of consensus-building, the roles of different agents, both internal and external to the community, as well as some factors that foster or prevent community appropriation. To conclude we will emphasize the potential of community museum networks as a strategy to generate a broader field of action, in which communities can exercise greater autonomy, by collectively developing and appropriating projects of regional and even international scope.

Perceptual aspects of a three-dimensional vowel space

This dissertation examines the auditory-perceptual theory of speech perception and the concept and validity of perceptual target zones for vowels.

Evaluation of multiple speech processing combinations in the Cochlear Nucleus 5 cochlear implant system using R-Space simulation

Difficulty understanding speech in the presence of background noise is a common report among cochlear implant recipients. The purpose of this research is to evaluate speech processing options currently available in the Cochlear Nucleus 5 sound processor to determine the best option for improving speech recognition in noise.

Self-Fulfilling Crises in the Eurozone: An Empirical Test. CEPS Working Document No. 366, 22 June 2012

This paper tests the hypothesis that government bond markets in the eurozone are more fragile and more susceptible to self-fulfilling liquidity crises than in stand-alone countries. We find evidence that a significant part of the surge in the spreads of the PIGS countries (Portugal, Ireland, Greece and Spain) in the eurozone during 2010-11 was disconnected from underlying increases in the debt-to-GDP ratios and fiscal space variables, and was the result of negative self-fulfilling market sentiments that became very strong since the end of 2010. We argue that this can drive member countries of the eurozone into bad equilibria. We also find evidence that after years of neglecting high government debt, investors became increasingly worried about this in the eurozone, and reacted by raising the spreads. No such worries developed in stand-alone countries despite the fact that debt-to-GDP ratios and fiscal space variables were equally high and increasing in these countries.