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Gomes R.D.V.A.,Pontifical Catholic University of Rio de Janeiro | Casanova M.A.,Pontifical Catholic University of Rio de Janeiro | Lopes G.R.,Pontifical Catholic University of Rio de Janeiro | Paes Leme L.A.P.,Institute Computacao
Lecture Notes in Business Information Processing | Year: 2015

The Linked Data best practices recommend to publish a new tripleset using well-known ontologies and to interlink the new tripleset with other triplesets. However, both are difficult tasks. This paper describes CRAWLER-LD, a metadata crawler that helps selecting ontologies and triplesets to be used, respectively, in the publication and the interlinking processes. The publisher of the new tripleset first selects a set T of terms that describe the application domain of interest. Then, he submits T to CRAWLER-LD, which searches for triplesets whose vocabularies include terms direct or transitively related to those in T. CRAWLER-LD returns a list of ontologies to be used for publishing the new tripleset, as well as a list of triplesets that the new tripleset can be interlinked with. CRAWLER-LD focuses on specific metadata properties, including subclass of, and returns only metadata, hence the classification “metadata focused crawler”. © Springer International Publishing Switzerland 2015.


Vieira-Damiani G.,University of Campinas | Ferro D.P.,University of Campinas | Adam R.L.,Institute Computacao | De Thomaz A.A.,Institute Fisica Gleb Wataghin | And 3 more authors.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2011

Elastic and collagen fibers are essential components of the aorta, the remodeling of these structures is accompanied with aging in various diseases and life-threatening events. While the elastic fibers confer resilience to major blood vessels collagen confers resistance to the same. Elastic fibers are easily visualized in the fluorescent light when stained with hematoxylin eosin. Second Harmonic Generation (SHG) is a non linear signal that occurs only in molecules without inversion symmetry and is particularly strong in the collagen fibers arranged in triple helices. The aim of this paper is to describe the distribution of collagen in the thickness of the thoracic aorta, and to demonstrate the distribution of between elastic fibers. The images were acquired in a multifoton microscopy and both signals, Two-phtoton excitaded fluorescence (TPEF) and SHG, were excited by a Ti:Sapphire laser. We used a band pass filter to filter the SHG signal from the TPEF signal. The thickness of the aorta varies 2-3 mm, and the image was composed of the juxtaposition of images of 220 × 220 microns. We acquired images of a histological slide of the thoracic aorta stained with picrosirius red (specific for collagen) at a wavelength of 670nm SHG subsequently acquired images with the same region and observed that the images are overlapping. Therefore, the following images were acquired by confocal microscopy (fluorescence of eosin for visualization of elastic fibers) and for collagen SHG.After reconstruction of the images, we observed the distribution of collagen along the aorta. © 2011 SPIE.


Queiroz F.,Institute Computacao | Walter M.,Federal University of Rio Grande do Sul
Brazilian Symposium of Computer Graphic and Image Processing | Year: 2012

The seamless integration of the shape and visual attributes of virtual objects is still one of the greatest challenges in Computer Graphics. For some natural objects, such as patterned animals, shape and appearance are mutually connected and therefore the individual treatment of these two aspects difficult the whole process and limits the visual results. One approach to solve this problem is to create shape and appearance together, thus generating so-called intelligent textures, since they can adapt to the surface of the object according to geometric information. The Clonal Mosaic model presented an approach for intelligent texturing of fur patterns seen in some mammals, particularly the big cats and giraffe. This paper extends this model to account for biologically plausible contrasting fur patterns, mostly seen in black and white, either regular - as seen in zebras, or irregular - as seen in cows and horses, among other animals. The main contributions of this work are the addition of a neural crest model, local control for parameters, and also vector field definition on the object's surface for simulation control. The results synthesized for various mammals with contrasting patterns such as cows, horses, and zebras, and other contrasting patterns found in frogs, for example, confirm the advantages of an integrated approach such as the one provided by the extended Clonal Mosaic procedural model. © 2012 IEEE.


Endler M.,Laboratory for Advanced Collaboration | Baptista G.,Laboratory for Advanced Collaboration | Silva L.D.,Laboratory for Advanced Collaboration | Vasconcelos R.,Laboratory for Advanced Collaboration | And 4 more authors.
Proceedings of the Workshop on Posters and Demos Track, PDT'11 - 12th International Middleware Conference, Middleware'11 | Year: 2011

In this paper, we describe ContextNet, a middleware architecture with context services for wide- and large-scale pervasive collaborative applications. It also provides context-based reasoning over data and events generated by autonomously moving users or their vehicles. © 2011 ACM.


De Souza C.S.,Pontifical Catholic University of Rio de Janeiro | Garcia A.C.B.,Institute Computacao | Slaviero C.,Institute Computacao | Pinto H.,Institute Computacao | Repenning A.,University of Colorado at Boulder
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

Computational thinking involves many different abilities, including being able to represent real and imaginary worlds in highly constrained computer languages. These typically support very selective kinds of perspectives, abstractions and articulation compared to the unlimited possibilities provided by natural languages. This paper reports findings from a qualitative empirical study with novice programmers, carried out with AgentSheets in a Brazilian public school. The driving research question was: How do meanings expressed in natural language narratives relate to computational constructs expressed in programs produced by novices? We used semiotic and linguistic analysis to compare meaning representations in natural and artificial texts (game descriptions in Brazilian Portuguese and Visual AgenTalk code). We looked for recurring relations and what they might mean in the context of computational thinking education. Our findings suggest that the semiotic richness of AgentSheets can be explored to introduce different aspects of computational thinking in principled and heoretically-informed ways. © 2011 Springer-Verlag.

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