12,775 research outputs found

    Optical probing of supersonic flows with statistical correlation

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    Remote sensing tool reliably measures statistical properties of supersonic turbulence. Tool neither affects nor is adversely affected by flow field. Device determines characteristics of supersonic flow with optical system and provides method and apparatus for separating translational and rotational motions of turbulent structures in supersonic flow

    Laser net - A concept for monitoring wingtip vortices on runways

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    Network of laser beams passes over runway to photodetectors on opposite side, magnitude of beam deflection indicates magnitude of density gradient encountered. Visual display of beam deflections affects go, no-go decision for takeoff and landing

    Optical probing of supersonic aerodynamic turbulence

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    Laser quasi-schlieren system and laser shadow-correlation system retrieve flow-related signals sufficient for computing accurate, reproducible correlation peaks. Statistical method for obtaining one-shot measurements of the decay history of turbulent structures in a stationary frame of reference is discussed

    Extrair conhecimento de bases de dados: o caso dos provérbios.

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    Publicado também com o título “Extrair Conhecimento de Provérbios” em: Salgueiro, Maria de Fátima; Mendes, Diana A. e Martins, Luis F. (Eds.), «Temas e Métodos Quantitativos», vol. 6, Sílabo: Lisboa: 91-110, 2009. ISBN: 978-972-618-540-6.Para apoiar actividades de gestão de dados de um projecto para identificação de provérbios, tem vindo a ser construída uma base de dados ao longo de vários anos. No momento da presente análise, esta base de dados integrava informação sobre 25.000 expressões idiomáticas, incluindo mais de um milhar de respostas válidas a inquéritos de reconhecimento de provérbios. Neste artigo, descreve-se um projecto em curso com o objectivo de extrair conhecimento desta base de dados, de modo a conhecer melhor os inquiridos, o seu grau de reconhecimento de provérbios e a relação com os locais onde têm vivido. De modo a alcançar os objectivos delineados, propõe-se a utilização de metodologias de prospecção de dados (data mining), com passos como: preparação e pré-processamento, limpeza (data cleansing) e técnicas de redução de dados. A fase de preparação é cuidadosamente trabalhada, uma vez que nem sempre é descrita em estudos de prospecção de dados, apesar de constituir um passo fundamental na análise de dados provenientes de bases de dados. Para a descoberta de conhecimento, após a produção de uma tabela de dados desnormalizada, utilizam-se modelos de regressão linear múltipla e árvores de regressão segundo dois algoritmos distintos. Os resultados são comparados com o conhecimento de domínio paremiológico, com algumas conclusões inesperadas.ABSTRACT: For data management activities in a project for proverbial sentences identification, a data base has being assembled during several years. This data base collects, in the moment of this study, information about 25.000 idiomatic sentences, including more than one thousand valid answers for proverbial sentences recognition surveys. In this article a project is described with the purpose to extract knowledge from this data base, in order to better characterize the individuals participating in the surveys about their level of proverbial recognition and the influence of the locations they have been living. In order to reach the study objectives we use data mining methodologies including: data preparation and preprocessing, data cleansing, and data reduction techniques. This data preparation stage is carefully described because we believe this is sometimes forgotten in statistical data mining studies and is a fundamental step to attain any data mining study objective. For data analysis, after a denormalized file is produced, we use linear regression models and regression trees with two different algorithms. The descriptive results are compared with paremiology domain knowledge, with some unexpected conclusions

    Prever a origem do utilizador de um conjunto de provérbios.

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    XIV Jornadas de Classificação e Análise de Dados, Instituto Superior de Engenharia, Porto, 8-10 Fevereiro de 2007.Em geral, salienta-se o aspecto de os provérbios representarem uma matriz conceptual dos diversos esquemas de pensamento do povo português. Parece promissor estudar os Adagiários para adquirir um conhecimento básico das correntes de pensamento colectivo. Partindo de três colectâneas regionais baseadas em métodos quantitativos (Funk e Funk 2001a, 2001b e 2002), este artigo explora as diversidades regionais. Um estudo preliminar (Mendes, et al. 2006) confirmou as hipóteses dos autores dos adagiários açorianos da existência de uma relação significativa e positiva entre o conhecimento quantitativo de provérbios e a idade, nomeadamente o maior grau de reconhecimento de provérbios para inquiridos com idades superiores a 40 anos. Verificou-se que, nas ilhas do arquipélago dos Açores, se encontra uma taxa de reconhecimento superior às zonas de emigração açoriana. Esta observação pode reflectir o facto de, nestes últimos locais, a assimilação de uma cultura anglo-saxónica reduzir o repertório proverbial em Português, apesar de ser evidente que alguns provérbios são preservados como relíquias culturais. Registou-se que, em algumas ilhas pequenas, a quantidade dos provérbios era reduzida. (da Introdução

    Japan’s Constitution and U.N. Obligations in the Persian Gulf War: A Case for Non-Military Participation in U.N. Enforcement Actions

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    Expression of the insulin-like growth factor-II/mannose-6-phosphate receptor in multiple human tissues during fetal life and early infancy

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    The insulin like growth factor-II/mannose-6-phosphate (IGF-II/M6P) receptor has been detected in many cells and tissues. In the rat, there is a dramatic developmental regulation of IGF-II/M6P receptor expression, the receptor being high in fetal and neonatal tissues and declining thereafter. We have systematically studied the expression of the human IGF-II/M6P receptor protein in tissues from 10 human fetuses and infants (age 23 weeks gestation to 24 months postnatal). We have asked 1) whether there is differential expression among different organs, and 2) whether or not the human IGF-II/M6P receptor is developmentally regulated from 23 weeks gestation to 24 months postnatal. Protein was extracted from human tissues using a buffer containing 2% sodium dodecyl sulfate and 2% Triton X-100. Aliquots of the protein extracts were analyzed by sodium dodecyl sulfate- polyacrylamide gel electrophoresis and immunoblotting using an anti-IGF- II/M6P receptor antiserum (no. 66416) and 125I-protein A or an immunoperoxidase stain. IGF-II/M6P receptor immunoreactivity was detected in all tissues studied with the highest amount of receptor being expressed in heart, thymus, and kidney and the lowest receptor content being measured in brain and muscle. The receptor content in ovary, testis, lung, and spleen was intermediate. The apparent molecular weight of the IGF-II/M6P receptor (220,000 kilos without reduction of disulfide bonds) varied among the different tissues: in brain the receptor was of lower molecular weight than in other organs. Immunoquantitation experiments employing 125I-protein A and protein extracts from human kidney at different ages revealed a small, albeit not significant, difference of the receptor content between fetal and postnatal tissues: as in other species, larger amounts of receptor seemed to be present in fetal than in postnatal organs. In addition, no significant difference of the receptor content between human fetal liver and early postnatal liver was measured employing 125I-protein A- immunoquantitation in three fetal and five postnatal liver tissue samples. The distribution of IGF-binding protein (IGEBP) species, another abundant and major class of IGF binding principles, was also measured in human fetal and early postnatal lung, liver, kidney, muscle, and brain using Western ligand blotting with 125I-IGF-II: as with IGF-II/M6P receptor immunoreactivity there was differential expression of the different classes of IGFBPs in the various organs

    Using Natural Language Processing Techniques to Tackle the Construct Identity - Problem in Information Systems Research

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