7,799 research outputs found

    PlanetOnto: from news publishing to integrated knowledge management support

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    Given a scenario in which members of an academic community collaboratively construct and share an archive of news items, several knowledge management challenges arise. The authors' integrated suite of tools, called PlanetOnto, supports a speedy but high quality publishing process, allows ontology-driven document formalization and augments standard browsing and search facilities with deductive knowledge retrieva

    Collaborative semantic web browsing with Magpie

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    Web browsing is often a collaborative activity. Users involved in a joint information gathering exercise will wish to share knowledge about the web pages visited and the contents found. Magpie is a suite of tools supporting the interpretation of web pages and semantically enriched web browsing. By automatically associating an ontology-based semantic layer to web resources, Magpie allows relevant services to be invoked as well as remotely triggered within a standard web browser. In this paper we describe how Magpie trigger services can provide semantic support to collaborative browsing activities

    Viva a mandioca: a verdadeira face do Brasil.

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    Temos bons motivos para comemorar em 22 de abril os 510 anos de vida deste País. Na sua chegada ao Brasil, em 1553, o Padre José de Anchieta viu a importância da mandioca e logo a batizou de pão da terra ou pão dos trópicos. Quando Pero Vaz de Caminha escreveu a primeira carta ao Rei de Portugal, comunicou-lhe que a raiz brasileira já existia e fazia sucesso entre os indígenas. Ao referir-se aos nativos disse: "São tão rijos, tão nédios que não o somos tanto, com tanto trigo e legumes que comemos". "Eles não comem senão doutra coisa a não ser dum inhame que brota da terra", completou. Era a mandioca, "o pão do Brasil", o aipim, a macaxeira, desconhecida do colonizador europeu que sabia de algo semelhante, o inhame, proveniente das colônias da África portuguesa. O deputado Fernando Melo (PT-AC) está apresentando na Câmara um projeto de lei que cria o Dia Nacional da Mandioca, a ser lembrado a cada ano, na mesma data do Descobrimento do Brasil. Isso anima a todos os que se dedicam ao resgate dessa cultura em lugares onde ela "adormeceu" ou foi atropelada por grãos de exportação. Atualmente, a mandioca (Manihot esculenta Crants) está presente no dia-a-dia de 80 países e representa uma das principais explorações agrícolas do mundo. Colhem-se 170 milhões de toneladas/ano. Entre as tuberosas, ela perde apenas para a batata. A África é o maior produtor mundial com 53,32%, seguido pela Ásia (28,08%), Américas (18,49%) e Oceania (0,11%).bitstream/item/25872/1/-www.gentedeopiniao.com.br-hotsite-conteudo.php-news6016VIVA.pdfDisponível em: Acesso em: 24 jan. 2011

    Mining web data for competency management

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    We present CORDER (COmmunity Relation Discovery by named Entity Recognition) an un-supervised machine learning algorithm that exploits named entity recognition and co-occurrence data to associate individuals in an organization with their expertise and associates. We discuss the problems associated with evaluating unsupervised learners and report our initial evaluation experiments

    The abundance of Bullet-groups in LCDM

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    We estimate the expected distribution of displacements between the two dominant dark matter (DM) peaks (DM-DM displacements) and between DM and gaseous baryon peak (DM-gas displacements) in dark matter halos with masses larger than 101310^{13} Msun/h. We use as a benchmark the observation of SL2S J08544-0121, which is the lowest mass system (1.0×10141.0\times 10^{14} Msun/h) observed so far featuring a bi-modal dark matter distribution with a dislocated gas component. We find that (50±10)(50 \pm 10)% of the dark matter halos with circular velocities in the range 300 km/s to 700 km/s (groups) show DM-DM displacements equal or larger than 186±30186 \pm 30 kpc/h as observed in SL2S J08544-0121. For dark matter halos with circular velocities larger than 700 km/s (clusters) this fraction rises to 70 ±\pm 10%. Using the same simulation we estimate the DM-gas displacements and find that 0.1 to 1.0% of the groups should present separations equal or larger than 87±1487\pm 14kpc/h corresponding to our observational benchmark; for clusters this fraction rises to (7 ±\pm 3)%, consistent with previous studies of dark matter to baryon separations. Considering both constraints on the DM-DM and DM-gas displacements we find that the number density of groups similar to SL2S J08544-0121 is ∼6.0×10−7\sim 6.0\times 10^{-7} Mpc−3^{-3}, three times larger than the estimated value for clusters. These results open up the possibility for a new statistical test of LCDM by looking for DM-gas displacements in low mass clusters and groups.Comment: 6 pages, 3 figures, accepted for publication in ApJ Letter

    Diurnal experiment data report, 19-20 March 1974

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    Temperature and wind data are presented from 70 small meteorological sounding rockets launched from eight selected launch sites in the Western Hemisphere. Table 1 gives a complete listing of the launch sites involved and the altitude of temperature and wind observations successfully completed

    An Analytical model for the colorimetric characterization of color CRTs

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    To be a viable instrument for color appearance research, the color Cathode Ray Tube has to be very well calibrated and characterized. The purpose of this research was to develop the techniques and methods used to carry out such characterization, and also to evaluate to what degree of precision and accuracy can such a characterization be performed. A new model for predicting the CRT behavior is presented along with the experimental results that validate it
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