https://repositorio.ufma.br/jspui/handle/1/211 Sat, 04 Apr 2026 11:25:53 GMT 2026-04-04T11:25:53Z https://repositorio.ufma.br/jspui/handle/1/311 Título: Multicriterion Homogeneity Metric for Nodule Segmentation and Detection in Computed Tomography. Autor(es): Campos, Vanessa de Oliveira; Silva, Aristófanes Corrêa; Nunes, Rodolfo Acatauassu; Feitosa, Raul Queiroz Resumo: This work proposes a novel segmentation algorithm for lung nodules detection in thoracic computed tomography (CT) which uses more than one criterion in order to decide at each iteration whether two adjacent objects should be merged or not in a region growing procedure. In experiments conducted upon 33 thoracic CTs, support vector machine was used to discriminate nodules and non-nodules. The method achieved 80.9% sensitivity with 0.23 false positives per slice Descrição: Também disponível em: http://www.ic.uff.br/iwssip2010/Proceedings/nav/papers/paper_107.pdf Fri, 01 Jan 2010 00:00:00 GMT https://repositorio.ufma.br/jspui/handle/1/311 2010-01-01T00:00:00Z https://repositorio.ufma.br/jspui/handle/1/307 Título: Convergence of Augmented Reality and Scientific Visualization, and its Application to Energy, Medicine and Sports. Autor(es): Gattass, Marcelo; Silva, Aristófanes C.; Silva, Pedro Mario C. e; Raposo, Alberto Resumo: What do we find in common among systems that seek to convey meaningful images to an oil reservoir interpreter, a medical doctor and an ordinary sports fan enjoying a broadcasted game on TV? They are generated by a system that processes captured signals and produces images conveying relevant information to the viewer. These processes are based on Computer Vision techniques to analyze the signal in order to predict forms and find features mainly to answer a “what, where and when” type of question. With such information, Virtual Reality techniques are used to produce meaningful images to the human observer. These systems can be understood as the convergence of the Augmented Reality and Scientific Visualization areas. This study presents some industrydemanded systems developed by the Tecgraf group which reflect this convergence. Descrição: Também disponível em : http://www.ic.uff.br/iwssip2010/Proceedings/nav/papers/ip8.pdf Fri, 01 Jan 2010 00:00:00 GMT https://repositorio.ufma.br/jspui/handle/1/307 2010-01-01T00:00:00Z https://repositorio.ufma.br/jspui/handle/1/305 Título: Automatic Eye Detection Using Semivariogram Function and Support Vector Machine Autor(es): Almeida, João Dallyson Sousa de; Silva, Aristófanes Corrêa; Paiva, Anselmo Cardoso Resumo: Several computational systems which depend on the precise location of the eyes have been developed in the last decades. Aware of this need, we propose a method for automatic detection of eyes in images of human faces using semivariogram functions and support vector machines. Patterns of eyes region and other areas of the face are represented through the semivariogram function to precisely distinguish the region of the eyes. The method was tested in the ORL human face database, which contains 400 images grouped in 40 persons, each having 10 different expressions. The detection obtained results of sensitivity of 84.6%, specificity of 93.4% and accuracy of 88.45%. Descrição: Também disponível em: http://www.ic.uff.br/iwssip2010/Proceedings/nav/papers/paper_56.pdf Fri, 01 Jan 2010 00:00:00 GMT https://repositorio.ufma.br/jspui/handle/1/305 2010-01-01T00:00:00Z https://repositorio.ufma.br/jspui/handle/1/212 Título: State Space Decoupling Approach for Feedback Controller Design of Switching Converters Autor(es): Gomes, E. de C.; Ribeiro, L. A. de S.; Caracas, J. V. M.; Catunda, S. Y. C.; Lorenz, R. D. Resumo: This paper derives a new approach for analyzing dc-dc converters for feedback control design. The control-to-output voltage transfer function of the converters, usually predicted by averaging models, and the classical feedback control techniques are replaced by the state space average state block diagram analysis. These state block diagrams are obtained for state space averaging matrixes of the converters combined with their continuous conduction mode differential equations. This technique yields first order control transfer functions allowing easier synthesis of controllers. The resulting controllers demonstrate good transient response compared to voltage controllers based on k-factor approach. The structure is easy implement with relevant applications in integrated circuit manufacturing and industrial environment. Descrição: Presented by The 2010 International Power Electronics Conference,2010. Fri, 01 Jan 2010 00:00:00 GMT https://repositorio.ufma.br/jspui/handle/1/212 2010-01-01T00:00:00Z