Detection Algorithms
Mostrando 13-24 de 147 artigos, teses e dissertações.
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13. Electromechanical Impedance - Based Structural Health Monitoring Instrumentation System Applied to Aircraft Structures and Employing a Multiplexed Sensor Array
ABSTRACT: The electromechanical impedance method has been seen as a promising tool for structural health monitoring regarding different types of structures and purposes. Most importantly, this method can be used in real-time applications. Frequently, massive, high-cost, single-channel impedance analyzers are used to process the time domain data, aiming at ob
J. Aerosp. Technol. Manag.. Publicado em: 2015-09
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14. CHEMOSTAT, UM SOFTWARE GRATUITO PARA ANÁLISE EXPLORATÓRIA DE DADOS MULTIVARIADOS
The objective of this work was to develop a free access exploratory data analysis software application for academic use that is easy to install and can be handled without user-level programming due to extensive use of chemometrics and its association with applications that require purchased licenses or routines. The developed software, called Chemostat, empl
Quím. Nova. Publicado em: 2015-05
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15. Drowsiness detection for single channel EEG by DWT best m-term approximation
Introduction In this paper we propose a promising new technique for drowsiness detection. It consists of applying the best m-term approximation on a single-channel electroencephalography (EEG) signal preprocessed through a discrete wavelet transform. Methods In order to classify EEG epochs as awake or drowsy states, the most significant m terms from the wav
Res. Biomed. Eng.. Publicado em: 2015-04
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16. Algoritmo de otimização bayesiano com detecção de comunidades / Bayesian optimization algorithm with community detection
ALGORITMOS de Estimação de Distribuição (EDAs) compõem uma frente de pesquisa em Computação Evolutiva que tem apresentado resultados promissores para lidar com problemas complexos de larga escala. Nesse contexto, destaca-se o Algoritmo de Otimização Bayesiano (BOA) que usa um modelo probabilístico multivariado (representado por uma rede Bayesiana)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/10/2012
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17. IMPLEMENTAÇÃO DE UM SISTEMA DE TELEDIAGNÓSTICO PARA CLASSIFICAÇÃO DE MASSAS EM IMAGENS MAMOGRÁFICAS USANDO ANÁLISE DE COMPONENTES INDEPENDENTES / IMPLEMENTATION OF A SYSTEM OF TELEDIAGNOSIS FOR CLASSIFICATION OF MASSES IN MAMMOGRAPHIC IMAGES USING INDEPENDENT COMPONENT ANALYSIS
This thesis proposes the modeling and implementation of a telediagnostic system for analysis and detection of lesions in mammographic images based on independent component analysis and support vector machine. The system analyzes images from digital mammography sent over the Internet and provides a diagnostic, indicating the presence of suspicious regions, wh
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/07/2012
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18. Reconhecimento de texto e rastreamento de objetos 2D/3D / Text recognition and 2D/3D object tracking
In this thesis we address three computer vision problems: (1) the detection and recognition of flat text objects in images of real scenes; (2) the tracking of such text objects in a digital video; and (3) the tracking an arbitrary three-dimensional rigid object with known markings in a digital video. For each problem we developed innovative algorithms, which
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/03/2012
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19. Otimização multidimensional baseada em heurísticas aplicada aos sistemas de comunicação sem fio. / Multidimensional optimization - based heuristics applied to wireless communication systems.
Esse trabalho de investigação visa a realização de uma análise sistemática, integrada e iterativa da utilização de algoritmos heurísticos aplicados aos problemas de estimativa de parâmetros e detecção multiusuário, sob o ponto de vista do compromisso desempenho × complexidade. O sistema considera topologias do tipo CDMA com exploração de dive
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2012
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20. AvaliaÃÃo de edidas de influÃncia local em modelos lineares espaciais t-Student / Evaluation of local influence measure in t-student linear spacial models
The system of precision agriculture considers that agricultural areas are not homogeneous, so, fertilizers and agricultural lime must be applied at different rates, according to chemical analyzes and physical properties of soil. The use of geostatistics with precision agriculture allows establishing spatial dependence relations among the sampled points. It i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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21. Data mining in large sets of complex data / Mineração de dados em grande conjuntos de dados complexos
Due to the increasing amount and complexity of the data stored in the enterprises\ databases, the task of knowledge discovery is nowadays vital to support strategic decisions. However, the mining techniques used in the process usually have high computational costs that come from the need to explore several alternative solutions, in different combinations, to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2011
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22. Estimação de velocidade de composições usando processamento de vídeo / Speed estimation.of trains using vídeo processing
This dissertation aims to study a method of estimating the speed of railway vehicles using video processing. The proposed system uses cameras disposed alongside railways to monitor traffic as well as estimate train speeds. Such a system would allow the machinist to have a backup control system, regardless of the control systems already used by the operator o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2011
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23. Diferenciação automática de matrizes Hessianas / Automatic differentiation of hessian matrices
In the context of nonlinear programming, many algorithms boil down to the application of Newton s method to the system constituted by the first order Lagrangian conditions. The calculation of Hessian matrices is necessary in this class of solvers. Our focus is on the exact calculation, within machine precision, of Hessian matrices through automatic different
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2011
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24. Sistemas de detecção de intrusão com técnicas de inteligência artificial / Intrusion detection systems with artificial inteligence technics
Due the increase of the amount of important information on computer networks, security has became primordial to ensure the integrity, confidentiality and availability of data traffic. To improve security, there are useful tools such as Firewalls and Intrusion Detection Systems (IDS). Currently, methods of Artificial Intelligence (AI) are used to improve thes
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011