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Ciências Exatas e da Terra.

Moscati, Giorgio; Lerner, Eugênio
Fonte: CNPq/Coordenação Editorial; Brasília Publicador: CNPq/Coordenação Editorial; Brasília
Tipo: Parte de Livro
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O III PBDCT foi elaborado como um roteiro para a atuação do governo na área de ciência e tecnologia para o período de 80/85 e representa o detalhamento do capítulo IV do III PND. Dentro desse enquadramento, é feita a seleção de programas e atividades prioritárias, cuja implementação se consubstancia através de Ações Programadas em Ciência e Tecnologia, sob a coordenação do CNPq e com a participação dos setores interessados. O documento de Avaliação & Perspectivas das diversas subáreas se constitue em trabalho critico e comparativo entre o que propõe o PBDCT e o resultado das Ações Programadas, além de fornecer os elementos para as correções e para a definição dos novos rumos a serem seguidos. Este documento é composto da Avaliação e Perspectivas nas seguintes subáreas: Astronomia, Computação, Estatística, Física, Geociências, Matemática, Oceanografia e Química. Os redatores das subáreas foram convidados seguindo-se indicação dos respectivos Comitês Assessores, ficando assim constituída a equipe responsável pelo documento na Área de Ciências Exatas e da Terra: Professor Eugênio Lerner (coordenador) Astronomia - professor Edemundo da Rocha Vieira (UFRGS) Computação- professor Ysmar Viana e Silva Filho (UFRJ) Estatística- professor Djalma Galvão Carneiro Pessoa (IMPA) Física- professor Roberto Leal Lobo e Silva (CBPF) Geociências - professor Irajá Damiani Pinto (UFRGS) Matemática - professor Carlos Augusto Isnard (IMPA) Oceanografia - professor Clovis Teixeira (USP) Química- professor Walter Baptista Mors (UFRJ) Aos redatores foram dados meios para convidarem um certo número de pessoas da comunidade que os pudessem assessorar nos diversos setores de suas subáreas. Na preparação dos documentos os redatores se valeram...

Introdução às Ciências Exatas e da Terra.

Moscati, Giorgio
Fonte: CNPq; Brasília Publicador: CNPq; Brasília
Tipo: Parte de Livro
POR
Relevância na Pesquisa
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O III PBDCT foi elaborado como um roteiro para a atuação do governo na área de ciência e tecnologia para o período de 80/85 e representa o detalhamento do capítulo IV do III PND. Dentro desse enquadramento, é feita a seleção de programas e atividades prioritárias, cuja implementação se consubstancia através de Ações Programadas em Ciência e Tecnologia, sob a coordenação do CNPq e com a participação dos setores interessados. O documento de Avaliação & Perspectivas das diversas subáreas se constitui em trabalho crítico e comparativo entre o que propõe o PBDCT e o resultado das Ações Programadas, além de fornecer os elementos para as correções e para a definição dos novos rumos a serem seguidos. Este documento é composto da Avaliação e Perspectivas nas seguintes subáreas: Astronomia, Computação, Estatística, Física, Geociências, Matemática, Oceanografia e Química. Os redatores das subáreas foram convidados seguindo-se indicação dos respectivos Comitês Assessores, ficando assim constituída a equipe responsável pelo documento na Área de Ciências Exatas e da Terra: Professor Eugênio Lerner - Coordenador (UFRJ) Astronomia - professor Edemundo da Rocha Vieira (UFRGS) Computação - professor Ysmar Vianna e Silva Filho (UFRJ) Estatística - professor Djalma Galvão Carneiro Pessoa (IMPA) Física - professor Roberto Leal Lobo e Silva Filho (CBPF) Geociências- professor Irajá Damiani Pinto (UFRGS) Matemática- professor Carlos Augusto lsnard (IMPA) Oceanografia - professor Clovis Teixeira ( USP) Química- professor Walter Baptist Mors (UFRJ) Aos redatores foram dados meios para convidarem um certo número de pessoas da comunidade que os pudessem assessorar nos diversos setores de suas subáreas. Na preparação dos documentos os redatores se valeram...

Um modelo híbrido baseado em ontologias e RBC para a concepção de um ambiente de descoberta que proporcione a aprendizagem de conceitos na formação de teorias por intermédio da metáfora de contos infantis

Pessôa Neto, Agnaldo Cavalcante de Albuquerque
Fonte: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL Publicador: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL
Tipo: Dissertação Formato: application/pdf
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The actual work shows a model of discovery learning in order to realize a discovery environment (PARAGUAÇU, 1997) to demonstrate to the apprentice students in science, the understanding of how the concepts that are used in the creation of scientific theories are related. The subject is reached with the idea that is possible to create scientific theories in scientific models (FRIGG; HARTMANN, 2006; RUDNER, 1969), and that these models can be used to help in such learning. However, with the availability of such models, instead of introducing scientific terms related to some scientific topics, it intends to use the metaphor of Fairy Tales, what means, the vocabulary use of terms where the apprentice can understand by intuition on how a scientific theory is elaborated. On the other hand, in order to create and formalize this scientific model it was created the idea that was proposed by MIDES Architecture MIDES (PARAGUAÇU et al., 2003), which means the creation of a scientific model with the representation in XML (W3SCHOOLS, 2005b) in four views of knowledge: Hierarchy, Relational, Causal, and by Asking. So, the idea of this work is to show how the creation in XML is made, and to do so, it s necessary to make a review of the following subjects: learning environments; teaching based on cases; and some general aspects of a creation of a scientific theory...

Estudos sobre a conectividade em Redes de Sensores sem fios: Análise de Plataformas e resultados de Percolação no Plano Contínuo.

Almiron, Marcelo Gabriel
Fonte: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL Publicador: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL
Tipo: Dissertação Formato: application/pdf
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We study the minimum radius required for connectivity (CTR Critical Transmission Range) within homogeneous stationary Wireless Sensor Networks (WSN) topology control, considering different levels of attractivity within the sensors. Due to the complexity of dealing with this problem from a theoretical viewpoint, a Monte Carlo experience is devised for estimating the CTR distribution. With this information, we propose optimization procedures that, using as additional input a few known parameters (overall available budget, sensor cost, maximum available transmission radius, minimum probability of connectivity, environmental path loss and deployment cost) leads to the decision of the number and type of sensors to be acquired, their optimal communication radius and the ideal deployment strategy that maximize the WSN lifetime. As a previous result, the accuracy of several computational platforms for statistical computing was assessed, being the main conclusion that R (http://www.r-project.org) is the best choice; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; Apresentamos a caracterização do raio de transmissão mínimo necessário para garantir conectividade, CTR (Critical Transmission Range), num cenário de controle de topologia em RSSF homogêneas e estacionárias. Dada a complexidade de se trabalhar com modelos analíticos...

Arquitetura e Modelos de Interações Cooperativas e Adaptativas entre Agentes Humanos e Artificiais no Domínio de Fração.; Architecture and Models of Cooperative and Adaptive Interactions between human and Artificial Agents on Domain Fraction.

Sibaldo, Maria Aparecida Amorim
Fonte: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL Publicador: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL
Tipo: Dissertação Formato: application/pdf
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This work presents an interactive environment for learning about fractions, with mechanisms to support cooperative and adaptive interactions offered by tutors agents to human learners, focusing mainly on activities to solve problems. For this purpose, an architecture based on software agents and semantic Web services was proposed, therefore, we verify the functional viability of the proposal and, posteriorly, to present a revision of that architecture to suply some requirements not previously covered, beyond models that support to those interactions. With respect to interactions, the learner will receive support from both a pedagogical agent tutor, as some of their peers who are part of the environment. Particularly, a tutor agent has an open learner model, from which it obtains information to guide their actions. The idea of this model be opened is to allow the learner seeing the evaluation that the system has about him, and also the opportunity to disagree with this assessment, and thus contribute to the refinement of the content of such a model; Fundação de Amparo a Pesquisa do Estado de Alagoas; Este trabalho apresenta um ambiente interativo de aprendizagem sobre Frações, dotado de mecanismos de suporte a interações cooperativas e adaptativas oferecidas por seus agentes tutores aos aprendizes humanos...

Modelagem computacional da interdependência entre o fenômeno enos e a precipitação pluviométrica na Região Leste do Estado de Alagoas; Computer modeling of the interdependence between enso and rainfall in the eastern State of Alagoas

Silva, Jorge Silvestre da
Fonte: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL Publicador: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL
Tipo: Dissertação Formato: application/pdf
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Some stochastic phenomena can some way cause meaningful damages to the nature and human being as well. Among these phenomena there is the variable meteorological rainfall, which is the most important one for the agricultural and environmental activities developed in the tropical regions. Although its record has been taking as one of the simplest ones it s difficult, in some places, its measurement due to the lack of a well distributed pluviometer station net in most of the regions or due to mistakes occurred during the measured caused by badly calibrated instruments. The computational model has been more and more accepted and applied as a technique that allows to the analysts from different segments to verify or offer solutions with the efficiency required to the problems with whom they deal with daily in several areas of the human activities. The rainfall, through its relevance in the socio-economical context, mainly in regions where people live predominantly with an agricultural economy, the lack of rain causes a large loss in the productive sector and also causes the rural exodus. In this context, the variable rainfall is studied in this research work, using computational model techniques, monitored throughout 100 years, from 1911 to 2010...

Uma arquitetura para aprendizagem colaborativa utilizando a integração web e TV digital integrativa; An architecture for collaborative learning using the integration web and integrative TV digital

Dias Júnior, Maurício Vieira
Fonte: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL Publicador: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL
Tipo: Dissertação Formato: application/pdf
POR
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The Interactive Digital TV (TVDi) arises in society as an important resource for the promotion of learning, collaborative mainly, in response to technological developments television, and as a way to attend the need to strengthen education in the world. Given this perception, starting from one of the areas of learning sciences entitled CSCL (Computer-Supported Collaborative Learning), designed a research project, based on collaborative components, the result of which is characterized by an architecture for interaction using the Web and TV digital return channel via online, in order to make lessons more dynamic and virtual classroom learning and facilitate extracurricular student, without sacrificing entertainment medium that television provides the learner in his family and social context. The T-questions proposed environment enables virtual interactions and F2F (face to face), favoring a particular type of blended learning (b-learning) in the environment where the student is inserted, enhancing collaboration in order to motivate him to learn. Thus, in this dissertation, was developed a collaborative architecture combining NCL and LUA languages, with the support of the Brazilian middleware emulator - Ginga, composed of two modules: Web-Teacher-Student and TVDi...

Especificação e implementação de um sistema evolutivo de apoio à análise de demonstrações contábeis SEADC para fins de tomada de decisão; Specification and implementation of a evolutionary system to support financial statement analysis - ESAAS for decision making

Neves, Cleonábula Maria Maranhão
Fonte: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL Publicador: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL
Tipo: Dissertação Formato: application/pdf
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This paper describes the specification and implementation of a computational system entitled Evolutionary Support System for the Analysis of Accounting Statements (ESAAS), which aims to optimize decision making, and uses variations of the genetic algorithm from Holland. In its specification, there is a population formed by chromosomes that are vectors over a ternary alphabet with size corresponding to the number of account statements contained in the type of analysis chosen by the user. The ESAAS diagnoses the financial and economic situation of commercial, industrial companies or service providers, whether they are classified as micro, small, average, average-large or large companies. The diagnosis done by ESAAS was based on the analyzes of liquidity, debt profitability, added value, average terms, vertical and horizontal analyzes; and in the diagnosis of the analytical combination of liquidity, profitability and debt with the vertical analysis, showing as a justification, the influence of each of the accounts or group of financial accounts involved. The system receives as input a set of indexes, total values of the accounts or groups of accounts of financial accounting standards of the company that will be considered in a determinted period...

Classificação de informação usando ontologias; Information classification using ontologies

Silva, Eunice Palmeira da
Fonte: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL Publicador: Universidade Federal de Alagoas; BR; Modelagem Computacional de Conhecimento; Programa de Pós-Graduação em Modelagem Computacional de Conhecimento; UFAL
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
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Although the positive aspects that Internet possesses and the potential it permits, there is a problematic that consists on finding needed pieces of information among the deluge of available documents on the web. Tools that are able to semantically treat the information contained in the documents which follows a structure only focused on data presentation are still lacking. The MASTER-Web system solves the problem of integrated extraction of content-pages that belong to classes which form a cluster. In this context, we propose the extension of this tool to the scientific articles classification based on ontologies. To achieve this goal, an ontology for the Artificial Intelligence domain was constructed and rule-based classification strategies were adopeted. The approach presented here employs this ontology and textual classification techniques to extract useful pieces of information from the articles in order to infer to which themes it is about. This combination led to significative results: e.g. in the texts, the system is able to identify the specific subdivisions of AI and entails conclusions, distinguishing correctlly the themes of the articles from the ones that are briefiy mentioned in the texts. The application of simple techniques and a detailed ontology lead to promising classification results...

Estudo empírico de avaliação inteligente computadorizada de questões abertas baseado em colaboração; Conexionist Collaborative Intelligent Evaluation System

CORRÊA, Kleber Pullig
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
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This research submits to experimental tests in real-world environment, the Conexionist Collaborative Intelligent Evaluation System idealized by Martins (2004) and tested with simulations by Guimarães (2004), who have noticed consistent and promising results when dealing with synthetic datas. The system explores the Learning Theory by Kolb (1984), Peer Collaboration Evaluation and Artificial Intelligence (multilayer perceptrons neural networks), which are capable to apply and correct tests with open (free) questions. To get a real-world data, some students from the course of Engineer registered at Universidade Federal de Goiás (UFG) on the period of june 2008 to july 2009 were taken in heterogeneous groups composed by men and women in age from 16 to 26 years old and at least 18 students per test. The software SAICOweb, developed specifically to this data collection, allows the computerized evaluations of open (free) questions, by using methods and stages described at Guimarães (2004) research. SAICOweb system were experimental validited in a satisfactory way by an unique group composed by 38 students (by using two tests with 08 open questions each). The analisys of the results with Pearson correlation shows strong association (0...

Proposta e avaliação de um modelo computacional de gerador central de padrões; Proposal and evaluation of a computational model of Central Pattern Generator

BORGES, Marco Aurélio de Faria
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
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The concept of Central Pattern Generator-CPG can be described as neural network capable of producing coordinated rhythmic locomotor activity apart from any external rhythm or sensorial stimuli. As this group of neurons are autonomic and are located in the spinal medulla, is experimentally observed that brainless animal‟s exhibit robotized locomotor activity, for its march has no defined direction nor respond to any obstacles. Studies has shown that is possible to activate this specialized networks using specific drugs or electric stimuli depending only of the access area as brainstem, medulla or some brain areas. For this paper many models proposed in current literature were evaluated, in its majority conceptual models. Within this models the Rybak (2006) computational model was chosen to be reproduced and evaluated regarding its robustness. The model in question consist in a CPG based in experimental data collected in cats and it posses two level of neurons based in the half-center models in its structure, the Rhythmic Generator-RG and the Pattern Formation-PF. This groups control the activity of the motoneurons flexors and extensors in an articulation. For its implementation were necessary a simplification in the original model and new parameterization of the variables. The implemented model allows a locomotor activity simulation produced by the CPG when stimulating a Mesencephalic Locomotion Region. Two protocols of variation of conductance inn GR were applied intending to evaluate its strength. The results show that the CPG computer model created operates within physiological values in variations up to . This model presents an adaptation in the first and the current is the current that plays a major role in the occurrence of outbreaks. The conductance has a direct relationship with the period as a result of its increase...

Desenvolvimento de ferramenta de comparação de técnicas de processamento de sinais para determinar fadiga muscular por meio do sinal emg; Toolkit development for signals processing technics comparison to detect muscular fadigue by EMG signal

CAMPOS, Ramon de Freitas Elias
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
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This study aimed to development of a computational tool for electromyographic signal (EMG) analysis by signal processing techniques to determine muscular fatigue. With Ethics Committee of Federal University of Goiás approve were recorded from the dominant biceps brachii of 10 volunteers, that did not ever had muscular disease. The protocol consisted on get the maximal voluntary isometric contraction (MVIC) from the volunteer seated, floor contact with the feet, and forearm in 90 degree, doing three maximal voluntary contraction against a rigid and fixed surface, by five seconds, with a five resting minutes between each acquisition. The MVIC values were obtained by arithmetical mean from the three greater values of each contraction. In statistical analysis the volunteer sustained a load of 60% MVIC for 30 seconds, or while they supported. For dynamical analysis was used a electrogoniometer tied in forearm to measure the angle and a 60% MVIC load for 30 seconds measured, achieved angle of 70° until 130°, and return to 70°. Each flexion was did in 1,5 seconds, or while volunteer support. To analyze the signal in time domain were used Root main square (RMS) values and Continuous wavelet transform (CWT). To analyze in frequency domain were adopted the values of mean and median from Fast Fourier Transform (FFT)...

Adaptabilidade temática em sistemas tutores inteligentes híbridos; Thematic Adaptability in Hybrid Intelligent Tutoring Systems

QUINDERÉ, Pedro Sérgio Gomes
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
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In the context of efficient information transmission among people and, particularly in the helping of learning and training processes, this investigation presents results on the use of the technology of Hybrid Intelligent Tutoring Systems, based on artificial neural networks and expert rules, developed by Martins [MEA 2004], Melo [MEL 2003] and Meireles [MEI 2003]. Due to the fact that, in its initial empirical validation, neural training data has been originated from courseware in Introduction to Data Processing , some doubts have remained on the applicability of the trained neural network to other scenarios. The present production has approached these issues by the formalization of the content format and by presenting promising empirical results in two other scenarios: Scientific Methodology and Biological Rhythms . Results were analyzed by non-parametric methods with 5% significance. They reinforce the hypotheses that the studied tutoring system is efficient, able to reduce differences of distinct groups and shows thematic adaptability actually; No contexto da transmissão eficiente de informação entre pessoas, particularmente no auxílio a processos de ensino-aprendizagem e treinamento empresarial, este trabalho apresenta resultados da investigação do uso da tecnologia de Sistemas Tutores Inteligentes Híbridos...

PLANEJAMENTO DE REDE DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA COM RESTRIÇÕES GEOGRÁFICAS E ELÉTRICAS; PLANNING NETWORK DISTRIBUTION OF ELECTRICITY RESTRICTIONS WITH GEOGRAPHICAL AND ELECTRICAL

RIBEIRO, Geraldo Valeriano
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
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This work presents two methods to solve the problem of Electric Distribution Networks (EDN) with geographical and power restrictions. The high cost of the project involving EDN together with lack of efficient methods when working with real applications justifies the development of this research. Taking into account concepts of heuristic and metaheuristic two methods are proposed: The first is based on the Hill-Climbing (HC) heuristic and the second is based on the Simulated Annealing (SA) metaheuristic. The possible paths are provided by the Delaunay triangulation and it is considered the natural and socio-political obstacles of the site where you want to locate a new energy network. The dimension of the EDN feeders is calculated using the power flow results from the Forward-Backward method. The initial solution is found using an intelligent method. Then the SA metaheuristic and/or HC heuristic are used providing a good solution for a new EDN in comparison with the heuristic used to find the initial solution. A comparison is also made between the two proposed methods; RESUMO Neste trabalho são apresentados dois métodos para resolver o problema de planejamento de rede de distribuição de energia elétrica (RDEE) com restrições geográficas e elétricas. O custo elevado que envolve o projeto de RDEE unido à escassez de métodos eficientes quando se trata de aplicações reais justificam o desenvolvimento desta pesquisa. Considerando os conceitos de heurística e metaheurística são propostos dois métodos: o primeiro é baseado na heurística Hill-Climbing (HC) e o segundo é baseado na metaheurística Simulated Annealing (SA). Os possíveis caminhos são fornecidos pela triangulação de Delaunay e são considerados os obstáculos naturais e políticosociais (restrições geográficas) do local onde se deseja implantar a nova rede de energia elétrica. O dimensionamento dos alimentadores da RDEE é feito utilizando-se do fluxo de potência calculado pelo método Backward-Forward. A solução inicial é encontrada utilizando-se um método inteligente. A metaheurística SA e/ou a heurística HC são então utilizadas...

Utilização de um sistema de realidade virtual não imersiva como ferramenta para a reabilitação de membros superiores de indivíduos hemiparéticos; Using a not immersed virtual reality system as a tool for the hemiparetic upper limbs rehabilitation

BARBOSA, Dagoberto Miranda
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
125.8%
Os Acidentes Vasculares Encefálicos (AVE) representam, atualmente, a principal causa de incapacidades neurológicas e uma das doenças com maior índice de mortalidade e morbidade do mundo moderno. Entre os prejuízos que esta patologia provoca, se destaca a hemiplegia, distúrbio do movimento que limita ou impede a utilização do hemicorpo plégico em atividades funcionais. As estratégias utilizadas atualmente para a reabilitação de indivíduos hemiplégicos baseiam-se nos conceitos de neuroplasticidade e aprendizado motor, e têm por objetivo influenciar a capacidade do cérebro de reagir a estímulos organizados com alterações de sua estrutura e função. Dentre os métodos de tratamento utilizados na reabilitação da hemiplegia, a Realidade Virtual (RV) vem se destacando como ferramenta de apoio ao tratamento, já que os Sistemas de RV permitem, ao paciente, experimentar a prática intensiva e sistematizada de movimentos em um ambiente interativo, motivante, desafiador e lúdico, além de possibilitarem ao terapeuta, a adequação do grau de dificuldade das tarefas e a avaliação objetiva dos ganhos obtidos. Neste contexto, este trabalho tem como objetivo identificar se um programa de reabilitação utilizando o sistema de Realidade Virtual não imersiva denominado SisTeV (Sistema de Terapia Virtual para Membros Superiores) provocaria variações nas características do movimento realizado pelo membro superior de indivíduos hemiparéticos em decorrência do AVE. Buscou-se identificar também se os ganhos de desempenho motor...

Uso de sistemas tutores inteligentes na compreensão de leitura; Intelligent tutoring systems in reading comprehension

BORGES, Fabrícia Neres
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
125.79%
Brazilian students have achieved poor results in the National Student Performance Exam (ENADE) in 2006. ENADE has shown reading is badly cultivated among undergraduates. The low interest on reading is justified by the fact that most of students have jobs and are enrolled in evening courses, without enough time to studies. The current research proposes the use of intelligent tutoring systems to improve student reading comprehension. The main goal is to develop the technique of underlining among undergraduates to assist in the analysis of academic texts. Two groups of students, A and B, participated in data collection. The difference between the groups is the amount of exercises performed in each group. Students of Group A have received 20 exercises with four levels of difficulty. In Group B, an Artificial Neural Network, Multilayer Perceptron (MLP), decides the amount of exercises that the student must perform at each level of difficulty by controlling what is the next exercise after each exercise is finished. The approach used in Group B adapts to the characteristics of knowledge retention of each student. Therefore, the tutoring system adapts the degree of exercise difficulty to the student. Statistical data analysis has indicated significant differences between groups A and B.; Os estudantes universitários brasileiros apresentaram baixos índices de leitura no Exame Nacional de Desempenho (ENADE) em 2006. O ENADE mostrou que o hábito de ler é pouco cultivado entre os universitários. O pouco interesse pela leitura é justificado pelo fato de que maioria dos estudantes são trabalhadores matriculados em cursos noturnos...

ROTEAMENTO AUTOMÁTICO DE ALIMENTADORES NO PLANEJAMENTO DE SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA; AUTOMATIC ROUTING OF FOOD IN PLANNING SYSTEMS DISTRIBUTION OF ELECTRIC ENERGY

ROCHA, Adson Silva
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
125.8%
The present work deals with the problem of planning the distribution system of electricity and is divided into three parts: Problem Definition, Resolution Approaches and Results and Conclusions. The energy distribution networks are of great economic importance in countries like Brazil. On one hand, there are fixed costs of physical installation and operation of the network, mainly due to the costs of energy losses and, secondly, the natural obstacles along the possible passages of network s links. The large amount of these costs, together with lack of efficient methods when it comes to real applications in the matter, justify the development of this research. The study of such aspects, the precise definition of the problem and the reasons that motivated this work can be found on the first part of this work. The second part shows the approaches for resolution. Three proposals methods were adopted: the first uses the algorithm Prim associated with the method Nelder-Mead Simplex. In the second proposal uses Dynamic Programming and, finally, we take the metaphor of Ant Colony also associated with the Nelder-Mead Simplex. The results, presented at the third part of this work, demonstrated the effectiveness of the proposed methods, especially the good compromise between performance and applicability obtained by the third proposal.; O presente trabalho lida com o problema de planejamento da rede de distribuição de energia elétrica...

A Utilização de Redes Neurais Artificiais na Estimação da Cobertura do Sinal de Televisão Digital; The Use of Artificial Neural Networks in the Estimation of Coverage Digital TV Signal

SILVA, Douglas Dias da
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
145.81%
THIS works presents information about signal intensity obtained on field and from simulations for one-seg and full-seg receptions, the city of Goi ania. The values obtained from measurements were used for a comparisson among propagation models that are presented in literature, and the goal is to determine the real condition of digital TV signal in the region of Goi ania. The propagation models presented are available in literature and can be implemented in digital transmission system. The studied models were Free Space model, Log-Distance model, Hata model and ITU-R P.1546-1 method, and the objective was to determine the signal intensity of digital television transmission in the city of Goi ania (RAPPAPORT, 1996) (UNION, 2003). Focusing on the development of a tool for signal intensity estimation, some researches were done about neural networks theory and its applications. Perceptron and Multilayer Perceptron were the analised architectures, emphasyzing on the last one and on its supervisioned trainning through the backpropagation error algorithm (HAYKIN, 2001). The Brazilian Digital Television System was described by reference rules made by Associa¸c ao Brasileira de Normas T´ecnicas, which has detailed its transmission system and reception devices (T´ECNICAS...

Amplificação sináptica e interações não lineares na arborização dendrítica de modelos de motoneurônios; Synapti Amplication and Nonlinearities interations in the dendritics tree of motoneurons models

RODRIGUES, Fábio Barbosa
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
135.78%
From motoneurons models (MN) of complex geometry and structure, able to reproduce the characteristics of a real motoneuron, the aim of this work is to verify the functional differences between proximal and distal synapses, investigating the nonlinearities in passive equivalent dendrites of motoneuron models and to study the influence of persistent calcium channels type L (Cav1.3), present in the dendrites, in the synaptic amplification. The original models developed by Vieira and Kohn (2007), implemented in C++, were expanded. This allowed to accomplish tests in order to verify the functional differences of synapses that occur near the soma and along of the dendrites. Persistent channels of calcium (CaV1.3) were modeled in dendrites and the influence of these channels in the amplification of the synaptic currents along the dendrites was verified. Finally, the nonlinearities of responses degree in the dendritic tree for different synaptic activation was evaluated. In order to verify the functional differences between proximal and distal synapses pure sinusoids were injected in different dendritic compartments of the models. The results showed attenuation at higher frequencies and the cutoff frequency is smaller as we move along the dendrites far from the soma. The influence of persistent calcium channels was verified comparing the functional differences between proximal and distal synapses along of the soma...

Análise do modelo de Kiyotaki-Wright em simulações multiagentes que utilizam a plataforma Swarm; Analysis of the Kiyotaki-Wright Model in Multi-Agent Simulations that Use the Swarm Platform

RODOVALHO, Wildener Monteiro
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Engenharia Elétrica e de Computação; Engenharia
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
125.8%
The goal of this dissertation is to make a methodological repetition of Duffy and Ochs's and Rouchier's works. Nonetheless, it tries to have a different focus. Among many theoreticaleconomical models which explain the emergence of money, there is one that distinguishes itself due to its simplicity, efficiency, and robustness: Kiyotaki-Wright's model. Therefore, some economists devoted themselves to apply this model in experiments with human beings and in computer simulations. Among those economists, Duffy and Ochs applied it later, correcting some flaws of the application process used by their predecessors. Duffy and Ochs's studies showed that Kiyotaki-Wright's model is actually valid for its purpose. However, besides all the efforts made, their agents were not able to achieve the foreseen equilibrium. In the same way, the French researcher Rouchier repeated methodologically the works of Duffy and Ochs while criticizing their implementation details. From this research, Rouchier creates other four sub-models in order to take her agents to the proposed equilibrium, obtaining partial success. In this dissertation, the computer system development platform is Swarm, especially created to multi-agent simulations and used, most of the time...