7,364 research outputs found

    Feature selection and novelty in computational aesthetics

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    [Abstract] An approach for exploring novelty in expression-based evolutionary art systems is presented. The framework is composed of a feature extractor, a classifier, an evolutionary engine and a supervisor. The evolutionary engine exploits shortcomings of the classifier, generating misclassified instances. These instances update the training set and the classifier is re-trained. This iterative process forces the evolutionary algorithm to explore new paths leading to the creation of novel imagery. The experiments presented and analyzed herein explore different feature selection methods and indicate the validity of the approach.Portugal. Fundação para a Ciência e a Tecnologia; PTDC/EIA–EIA/115667/2009Galicia.Consellería de Innovación, Industria e Comercio ; PGIDIT10TIC105008P

    Indicadores de sustentabilidad como técnica de sensibilización de agricultores familiares en transicion agroecológica en Distrito Federal, Brasil.

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    Ese trabajo tuvo por objetivo utilizar los indicadores de sustentabilidad cómo forma de discutir técnicas de manejo más sostenibles para la producción de hortalizas entre campesinos en Distrito Federal, Brasil.Código A4-62. V SOCLA

    Avaliação participativa da qualidade de solos em unidades de produção familiar de hortaliças no Distrito Federal.

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    Este trabalho objetivou avaliar, de maneira participativa com o uso de indicadores de sustentabilidade, a qualidade dos solos de seis propriedades familiares de produção de hortaliaças no Distrito Federal.Edição dos Resumos do IX Congresso Brasileiro de Agroecologia e IV Seminário Estadual de Agroecologia, Belém, 2015

    Infrared behavior of interacting bosons at zero temperature

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    We review the infrared behavior of interacting bosons at zero temperature. After a brief discussion of the Bogoliubov approximation and the breakdown of perturbation theory due to infrared divergences, we present two approaches that are free of infrared divergences -- Popov's hydrodynamic theory and the non-perturbative renormalization group -- and allow us to obtain the exact infrared behavior of the correlation functions. We also point out the connection between the infrared behavior in the superfluid phase and the critical behavior at the superfluid--Mott-insulator transition in the Bose-Hubbard model.Comment: 8 pages, 4 figures. Proceedings of the 19th International Laser Physics Workshop, LPHYS'10 (Foz do Iguacu, Brazil, July 5-9, 2010

    Inspiratory fraction and exercise impairment in COPD patients GOLD stages II-III

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    The inspiratory-to-total lung capacity ratio or inspiratory fraction (inspiratory capacity (IC)/total lung capacity (TLC)) may be functionally more representative than traditional indices of resting airflow limitation and lung hyperinflation in patients with chronic obstructive pulmonary disease (COPD).In the present retrospective study, a comparison was made of the individual performance of post-bronchodilator IC, IC/TLC and forced expiratory volume in one second (FEV1) in predicting a severely reduced peak oxygen uptake (V'o(2); < 60% predicted) in 44 COPD patients Global Initiative for Chronic Obstructive Lung Disease stages II-III (post-bronchodilator FEV1 ranging from 31-79% pred).Patients with lower IC/TLC values (<= 0.28) showed increased lung volumes and reduced exercise capacity as compared with other subjects. Following a multiple linear regression analysis, only IC/TLC and FEV1 remained as independent predictors of V'o(2) (r(2)=0.33). A receiver operating characteristic (ROC) curve analysis revealed that an IC/TLC <= 0.28 had the highest specificity (89.6%), positive predictive value (80%) and overall accuracy (86.3%) in identifying patients with V'o(2)< 60% pred. in addition, the area under the ROC curve tended to be higher for IC/TLC than IC.In conclusion, post-bronchodilator total lung capacity-corrected inspiratory fraction provides useful information in addition to forced expiratory volume in one second and inspiratory capacity, to estimate the likelihood of chronic obstructive pulmonary disease patients to present with severely reduced maximal exercise capacity.Universidade Federal de São Paulo, Paulista Sch Med, Pulm Funct & Clin Exercise Physiol Unit, Resp Div,Dept Med,EPM, BR-04020050 São Paulo, BrazilUniversidade Federal de São Paulo, Paulista Sch Med, Pulm Funct & Clin Exercise Physiol Unit, Resp Div,Dept Med,EPM, BR-04020050 São Paulo, BrazilWeb of Scienc

    Precise determination of stellar parameters of the ZZ Ceti and DAZ white dwarf GD 133 through asteroseismology

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    An increasing number of white dwarf stars show atmospheric chemical composition polluted by heavy elements accreted from debris disk material. The existence of such debris disks strongly suggests the presence of one or more planet(s) whose gravitational interaction with rocky planetesimals is responsible for their disruption by tidal effect. The ZZ Ceti pulsator and polluted DAZ white dwarf GD 133 is a good candidate for searching for such a potential planet. We started in 2011 a photometric follow-up of its pulsations. As a result of this work in progress, we used the data gathered from 2011 to 2015 to make an asteroseismological analysis of GD 133, providing the star parameters from a best fit model with MM/MM_{\odot} = 0.630 ±\pm 0.002, TeffT_{\rm eff} = 12400 K ±\pm 70 K, log(MHe/MM_{\rm He}/M) = -2.00 ±\pm 0.02, log(MH/MM_{\rm H}/M) = -4.50 ±\pm 0.02 and determining a rotation period of \approx 7 days.Comment: 10 pages, 13 figures, accepted by MNRA

    Photoproduction at collider energies: from RHIC and HERA to the LHC

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    We present the mini-proceedings of the workshop on ``Photoproduction at collider energies: from RHIC and HERA to the LHC'' held at the European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*, Trento) from January 15 to 19, 2007. The workshop gathered both theorists and experimentalists to discuss the current status of investigations of high-energy photon-induced processes at different colliders (HERA, RHIC, and Tevatron) as well as preparations for extension of these studies at the LHC. The main physics topics covered were: (i) small-xx QCD in photoproduction studies with protons and in electromagnetic (aka. ultraperipheral) nucleus-nucleus collisions, (ii) hard diffraction physics at hadron colliders, and (iii) photon-photon collisions at very high energies: electroweak and beyond the Standard Model processes. These mini-proceedings consist of an introduction and short summaries of the talks presented at the meeting
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