Máquinas de vetores suporte usando o algoritmo evolução diferencial com busca local para classificação de dados

Mineração de dados é uma área chave para diversos campos da ciência e engenharia. Neste contexto, um método de aprendizado estatístico, conhecido como máquinas de vetores suporte tem se apresentado como um método promissor para solucionar classificação de dados. Geralmente, o problema de máquinas de vetores suporte (inglês: Support Vector Machines - SVM) é formulado como um problema de otimização não-linear sujeito a restrições. Técnicas de otimização convencionais que utilizam a abordagem Lagrangiana são usadas para solucionar este tipo de problema. No caso de classificação de dados ruidosos as técnicas convencionais apresentam deterioração de desempenho, já que o problema de otimização resultante é multidimensional e pode apresentar muitos mínimos locais. Neste trabalho, é proposto o algoritmo Evolução Diferencial combinado com uma técnica de busca local, uma hibridização de busca tabu com o método Nelder-Mead, para encontrar os parâmetros ótimos dos classificadores SVM aplicados a dados ruidosos

Modeling the effects of climate and land use change on carbon and trace gas budgets over the Amazon Region using NASA satellite products.

Abstract ID: 14. Publicado também on-line

Efectos de la ablación telencefálica sobre el aprendizaje apetitivo instrumental en la carpa dorada (Carassius auratus)

Efectos de la ablación telencefálica sobre el aprendizaje apetitivo instrumental en la carpa dorada (Carassius auratus). En este experimento se emplearon carpas doradas (Carassius auratus) con ablación bilateral del telencéfalo o con operación de control en un procedimiento de entrenamiento instrumental con distribución de ensayos ampliamente espaciados (un ensayo por día). Los animales fueron entrenados a nadar en un corredor bajo condiciones de reforzamiento continuo o reforzamiento parcial al 50%. Se realizaron 32 sesiones diarias de adquisición seguidas de 32 sesiones diarias de extinción en las que la comida fue suprimida. La lesión telencefálica afectó a la adquisición durante los primeros ensayos, aunque, al final, los animales lesionados alcanzaron una ejecución asintótica similar a la de los animales controles. La extinción se vio facilitada por las lesiones, independientemente del programa de reforzamiento usado durante la adquisición. Los resultados se interpretan en relación a los estudios comparativos de aprendizaje instrumental apetitivo con ensayos espaciados realizados en otros vertebrados.Goldfish received either bilateral ablation of the telencephalon or a sham operation, followed by instrumental training under widely-spaced conditions (one trial per day). Animals were trained to swim in a runway for either continuous reinforcement or 50% partial reinforcement. Thirty-two daily acquisition sessions were followed by 32 daily extinction sessions during which food was withheld. Telencephalic lesions disrupted early acquisition performance, but lessoned animals achieved an asymptotic performance similar to that of sham controls. Extinction was facilitated by the lesions, independently of the schedule of reinforcement used during acquisition. The results are interpreted in relation to comparative research on spaced-trial appetitive instrumental learning in vertebrates.Ministerio de Educación y Cultura PB96-1334Junta de Andalucía CVI-24

Housing and community

This communication comes from a practical proposal of the rehabilitation of structures in villages from the neighbourhood of Bairro da Serafina e Liberdade, in Campolide, Lisboa, developed during the 3rd year, in the course unit of Architecture VI, in the integrated Master of Architecture, from ISCTE-IUL, presented in the academic year of 2015/2016. We should consider that the type of intervention proposed serves new types of families which determine a redesign of the housing programme, bearing in mind the local context where it is localized. This way, this presentation is shown in a study more centred in the reinterpretation of the collective dwelling of the houses, focusing in the collective shared spaces, like the kitchen. In the proposed rehabilitation, it is stimulated and privileged the sharing of a common space – the kitchen, so that the residents have better housing conditions, with more agreeable spaces where fire is used, bearing in mind the small dimensions of the fires. It is important to notice that most houses of the block are totally or practically unoccupied. So, in order to propose a new way of housing, an inter-generational contact between old and new residents is promoted, as well as better living conditions and well-being. This way, it is very important to understand: (1) the essential characteristics of the structures in villages in Lisboa, so that the essential is kept and preserved in a rehabilitation proposal; (2) the importance of the kitchen in the house; (3) the type of space: preparation, confection and eating; (4) the way the kitchen adapts itself to be shared by different fires and if this space of preparation, confection and eating may have no fire at all.info:eu-repo/semantics/publishedVersio

Development of a Brazilian maize core collection

The aim of this study was to evaluate methods for developing a Brazilian maize core collection. For an initial survey of the active collection, passport information, as well as characterization and evaluation of accessions, were taken into consideration, these then being divided according to geographic region and kernel-type. Multiple sampling methods were evaluated. The strategy of constant sampling generated extensive alterations in extract accession frequency. The multivariate strategy with dispersion graphs and principal components associated with the Tocher method was considered efficient for identifying the most divergent genotypes. The multivariate strategy generated greater alterations in the variance of traits. The average number of traits revealed few modifications with the various sampling strategies used. Therefore, the active collection could be considered as possessing a satisfactory amount of information for most of its accessions. Moreover, the multivariate strategy generated modifications in the variance of the traits, independent of sampling intensity