1,450 research outputs found

    Detection of Sand Dunes on Mars Using a Regular Vine-based Classification Approach

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    This paper deals with the problem of detecting sand dunes from remotely sensed images of the surface of Mars. We build on previous approaches that propose methods to extract informative features for the classification of the images. The intricate correlation structure exhibited by these features motivates us to propose the use of probabilistic classifiers based on R-vine distributions to address this problem. R-vines are probabilistic graphical models that combine a set of nested trees with copula functions and are able to model a wide range of pairwise dependencies. We investigate different strategies for building R-vine classifiers and compare them with several state-of-the-art classification algorithms for the identification of Martian dunes. Experimental results show the adequacy of the R-vine-based approach to solve classification problems where the interactions between the variables are of a different nature between classes and play an important role in that the classifier can distinguish the different classes

    Alternativas tecnológicas para o controle de pragas do fruto da gravioleira.

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    bitstream/CNPAT-2010/11935/1/Pa-040.pd

    Estratégias para o controle de pragas do fruto da gravioleira.

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    bitstream/CNPAT-2010/11956/1/Ct-048.pd

    Levantamento e identificação das principais pragas do sapotizeiro.

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    Este trabalho objetiva preliminarmente, levantar, identificar e conhecer o grau de severidade de dano, bem como a epoca de ocorrencia das principais pragas e insetos beneficos associados ao sapotizeiro e, a partir dai, tracar estrategias ...bitstream/CNPAT-2010/5384/1/Pa-073.pd

    Pragas associadas à aceroleira.

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    A incidencia de algumas pragas de maior ou menor interesse economica tem sido observada com frequencia em areas irrigadas, destacando-se os pulgoes como a de maior severidade. Esss insetos atacam geralmente a extremidade tenra dos ramos, causando murchamento e morte, o que forca a emitir brotacoes laterais.bitstream/item/33820/1/Ct-038.pd

    Ocorrência e grau de severidade de dano das principais pragas da aceroleira.

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    bitstream/CNPAT-2010/12036/1/Pa-039.pd
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