A Learning Framework for Morphological Operators using Counter-Harmonic Mean

We present a novel framework for learning morphological operators using counter-harmonic mean. It combines concepts from morphology and convolutional neural networks. A thorough experimental validation analyzes basic morphological operators dilation and erosion, opening and closing, as well as the much more complex top-hat transform, for which we report a real-world application from the steel industry. Using online learning and stochastic gradient descent, our system learns both the structuring element and the composition of operators. It scales well to large datasets and online settings.Comment: Submitted to ISMM'1

Generalising the logistic map through the qq-product

We investigate a generalisation of the logistic map as $x_{n+1}=1-ax_{n}\otimes_{q_{map}} x_{n}$ ($-1 \le x_{n} \le 1$, $0<a\le2$) where $\otimes_q$ stands for a generalisation of the ordinary product, known as $q$-product [Borges, E.P. Physica A {\bf 340}, 95 (2004)]. The usual product, and consequently the usual logistic map, is recovered in the limit $q\to 1$, The tent map is also a particular case for $q_{map}\to\infty$. The generalisation of this (and others) algebraic operator has been widely used within nonextensive statistical mechanics context (see C. Tsallis, {\em Introduction to Nonextensive Statistical Mechanics}, Springer, NY, 2009). We focus the analysis for $q_{map}>1$ at the edge of chaos, particularly at the first critical point $a_c$, that depends on the value of $q_{map}$. Bifurcation diagrams, sensitivity to initial conditions, fractal dimension and rate of entropy growth are evaluated at $a_c(q_{map})$, and connections with nonextensive statistical mechanics are explored.Comment: 12 pages, 23 figures, Dynamics Days South America. To be published in Journal of Physics: Conference Series (JPCS - IOP

Oportunidades que o agronegócio caju oferece: pasta de amêndoa de castanha-de-caju.

bitstream/item/95653/1/COT13003.pd

Uso do programa computacional Gotas para avaliação da deposição de pulverização aérea sob diferentes condições climáticas.

Este trabalho avaliou o programa Gotas, desenvolvido pela Embrapa Informática Agropecuária e Embrapa Meio Ambiente, para comparação de resultados de deposição de pulverização aérea, em diferentes situações de temperatura e umidade relativa. Constatou-se que o programa permite estimativas fidedignas de parâmetros imprescindíveis à tomada de decisão sobre a calibração da pulverização. As pulverizações com aeronaves realizadas em condições de temperatura 36 ºC e 25% de umidade relativa foram totalmente inadequadas.bitstream/CNPMA/7435/1/boletim_39.pd

Fatores condicionantes a eficiência técnica e econômica da cajucultura nordestina.

Com base em dados levantados pelo CNPCa/EMBRAPA, relativos a safra 1988/89, testou-se a hipotese de que a baixa eficiencia tecnica e economica da cajucultura nordestina esta condicionada a fatores economicos, sociais e agronomicos. No Estado do Ceara, constatou-se que, dentro as variaveis com maior influencia positiva sobre a eficiencia tecnica e economica, destacaram-se o valor da terra ou qualidade dos solos, mao-de-obra empregada, educacao e montante de credito de custeio. No piaui, as variaveis da maior importancia na explicacao da eficiencia tecnica e economica foram idade do plantio, numero de plantas por hectare, assistencia tecnica e mao-de-obra empregada.bitstream/item/33715/1/Bp-003.pd

Adding aspect-oriented features to MATLAB

This paper presents an approach to enrich MATLAB with aspect-oriented extensions to experiment different implementation features. The language we propose aims to configure the low-level data representation of real variables and expressions, to a specifically-tailored fixed-point data representation that benefits from a more efficient support by computing engines (e.g., DSPs, application-specific architectures, etc.) without specific hardware-based floating point units. Additionally, the approach aims to help developers to introduce handlers and monitoring features, and to configure a function with an optimized implementation.FCT under projects PPC-VM (POSI/CHS/47158/2002) and SOFTAS (POSI/EIA/ 60189/200

Extracting samples of high diversity from thematic collections of large gene banks using a genetic-distance based approach.

Background Breeding programs are usually reluctant to evaluate and use germplasm accessions other than the elite materials belonging to their advanced populations. The concept of core collections has been proposed to facilitate the access of potential users to samples of small sizes, representative of the genetic variability contained within the gene pool of a specific crop. The eventual large size of a core collection perpetuates the problem it was originally proposed to solve. The present study suggests that, in addition to the classic core collection concept, thematic core collections should be also developed for a specific crop, composed of a limited number of accessions, with a manageable size. Results The thematic core collection obtained meets the minimum requirements for a core sample - maintenance of at least 80% of the allelic richness of the thematic collection, with, approximately, 15% of its size. The method was compared with other methodologies based on the M strategy, and also with a core collection generated by random sampling. Higher proportions of retained alleles (in a core collection of equal size) or similar proportions of retained alleles (in a core collection of smaller size) were detected in the two methods based on the M strategy compared to the proposed methodology. Core sub-collections constructed by different methods were compared regarding the increase or maintenance of phenotypic diversity. No change on phenotypic diversity was detected by measuring the trait "Weight of 100 Seeds", for the tested sampling methods. Effects on linkage disequilibrium between unlinked microsatellite loci, due to sampling, are discussed. Conclusions Building of a thematic core collection was here defined by prior selection of accessions which are diverse for the trait of interest, and then by pairwise genetic distances, estimated by DNA polymorphism analysis at molecular marker loci. The resulting thematic core collection potentially reflects the maximum allele richness with the smallest sample size from a larger thematic collection. As an example, we used the development of a thematic core collection for drought tolerance in rice. It is expected that such thematic collections increase the use of germplasm by breeding programs and facilitate the study of the traits under consideration. The definition of a core collection to study drought resistance is a valuable contribution towards the understanding of the genetic control and the physiological mechanisms involved in water use efficiency in plants