Controle conjunto de admissão de chamadas em redes sem fio co-localizadas

Gerenciamento de recursos de rádio é um tema importante e desafiador em redes sem fio. Na próxima geração de redes (redes 4G) esse tema é ainda mais desafiador devido à necessidade de gerenciamento de recursos das diversas redes sem fio de forma conjunta. Algoritmos de controle de admissão de chamadas (CAC) é uma alternativa viável e amplamente estudada em redes homogêneas para este fim. Contudo, os algoritmos de CAC propostos para redes homogêneas não são adequados para a próxima geração de redes sem fio por não possuírem uma visão global do sistema. Diante da importância de gerenciamento de recursos de rádio e da escassez de algoritmos de CAC destinados às redes heterogêneas, tem-se este tema como foco primário deste trabalho. Além da confecção de um modelo para controle conjunto de admissão de chamadas através da utilização de processos semi-markovianos de decisão, dada a existência de um conglomerado de tecnologias de acesso sem fio atuando colaborativamente, um estudo é realizado buscando-se avaliar o impacto da proporcionalidade existente entre os tamanhos de áreas de coberturas, no desempenho do sistema.

Projeto e implementação em DSP de sistema de comunicação multiportadora baseado no padrão G.fast

As redes de acesso usando cabos de cobre atualmente utilizam bandas de frequência até 30 MHz, especificada no padrão VDSL2. À medida que arquiteturas híbridas de fibra e cobre se tornam mais proeminentes na indústria e academia, torna-se possível utilizar cabos metálicos mais curtos (i.e. até 250 metros) conectando o último ponto de distribuição aos usuários, de modo que frequências mais altas podem ser exploradas para se alcançar taxas de transmissão de dados de 500 Mbps ou mais, como é o caso do padrão G.fast atualmente em desenvolvimento no ITU-T. Nesse trabalho, um simulador no domínio do tempo foi desenvolvido para avaliar a capacidade do sistema G.fast com diferentes tamanhos de extensão cíclica e diferentes topologias de rede especificadas pelo ITU-T. Os resultados das simulações mostram que sistemas G.fast são robustos a bridged taps e capazes de atingir altas taxas de dados para todas as topologias simuladas, provendo suporte à próxima geração de serviços de banda larga. Além disso, esse trabalho descreve o progresso da implementação de um protótipo de modem baseado no padrão G.fast em um ambiente híbrido de DSP multicore e FPGA utilizando kits de avaliação adquiridos pela UFPA. Arquiteturas, protocolos de comunicação e benchmarks são apresentados e avaliados para se chegar à conclusão de que tal protótipo é factível e fornece suporte flexível a várias linhas de pesquisa em banda larga da próxima geração.

Estudo comparativo de sistemas de rádio digital sobre fibra aplicado a C-RAN

O objetivo deste trabalho é comparar aspectos relacionados ao uso de Multiplexação por Subportadora (SCM) em um sistema de transmissão de Rádio Digital sobre Fibra (DRoF) aplicado à Arquitetura de Acesso a Rádio Centralizado (C-RAN). Para isso, foram criados dois cenários que fazem uso da tecnologia DRoF, onde no primeiro, três subportadoras são transmitidas em um comprimento de onda e, para o segundo cenário, três comprimentos de onda são transmitidos, onde cada um possui uma única subportadora. Para ambas configurações é visado alimentar unidades de rádio remoto (RRH) localizadas na torre de transmissão. São analisados aspectos de desempenho da recepção, alcance das redes e complexidade do sistema para cada um dos cenários propostos. Além disso, são mostrados passo a passo como os sistemas foram construídos utilizando o software de simulação VPITransmissionMaker. Foram considerados para cada subportadora uma taxa de 250 Mbps, modulação 16-QAM, centrados na frequência de 5GHz. Os resultados obtidos demonstram que, para SCM-DRoF, uma Taxa de Erro de Bit (BER) de 10^-6 é mantida constante para enlaces de até 20 km. No segundo modelo, sem uso de SCM, um desempenho similar foi verificado, contudo com alcance de até 40 km. Dado o contexto da aplicação, os fatores desempenho e distância levam a crer que ambos cenários de transmissão podem ser utilizadas para C-RAN. Contudo, levando em consideração o custo e a complexidade no domínio óptico, o sistema utilizando SCM, comparativamente, possui mais vantagens. Conclui-se então que o uso de SCM apresenta-se como uma forte opção para aplicações no contexto das novas tecnologias de redes de acesso móvel.

Avaliação experimental de um sistema não linear para extração de energia através de vibrações utilizando material piezelétrico

Pós-graduação em Engenharia Mecânica - FEIS

Modelagem generalizada do problema de planejamento da expansão de sistemas de transmissão

Pós-graduação em Engenharia Elétrica - FEIS

Energetic-environmental assessment of a scenario for Brazilian cellulosic ethanol

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Highly Ordered TiO2 Nanotubes for Electrochemical Sensing of Hair Dye Basic Brown 17

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Fast fault section estimation in distribution control centers using adaptive genetic algorithm

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Emergetic ternary diagrams: five examples for application in environmental accounting for decision-making

In a recent paper, "A combined tool for environmental scientists and decision makers: ternary diagrams and emergy accounting." [Giannettti BF, Barrella FA, Almeida CMVB. A combined tool for environment scientists and decision makers: ternary diagrams and emergy accounting. J Clean Prod, in press http://dx.doi.org/10.1016/j.jclepro.2004.09.002] Ternary diagrams were proposed as a graphical tool to assist emergy analysis. The graphical representation of the emergy accounting data makes it possible to compare processes and systems with and without ecosystem services, to evaluate improvements and to follow the system performance over time. The graphic tool is versatile and adaptable to represent products, processes, systems, countries, and different periods of time.The use and the versatility of ternary diagrams for assisting in performing emergy analyses are illustrated by means of five examples taken from the literature, which are presented and discussed. It is shown that emergetic ternary diagram's properties assist the assessment of the system of the system efficiency, its dependance upon renewable and non-renewable inputs and the environmental support for dilution and abatement of process emissions. With the aid of ternary diagrams, details such as the interaction between systems and between systems and the environment are recognized and evaluated. Such a tool for graphical analysis allows a transparent presentation of the results and can serve as an interface between emergy scientists and decision makers, provided the meaning of each line in the diagram is carefully explained and understood. (c) 2005 Elsevier Ltd. All rights reserved.

Genetic parameters for earnings in Quarter Horse

In this study, we estimated the heritability (h(2)) of earnings in the Quarter Horse in order to evaluate the inclusion of this trait in breeding programs. Records from 14,754 races of 2443 horses from 1978-2009 were provided by Sorocaba Hippodrome, Sao Paulo, Brazil. All ancestors of the registered horses were included in the pedigree file until the 4th generation. Log-transformed performance measures (LPM) were analyzed for animals aged 2, 3, and 4 years and during their entire career. The h(2) estimates were obtained using a multi-trait model and Gibbs sampling that included the effects of sex, year of race, and animal in all analyses. Five analyses were performed: 1 in which LPM was divided by the number of prizes, 1 in which LPM was divided by the number of race starts, and 3 analyses that included the number of prizes, number of race starts, and both (LPM_cNPS) as covariates. Analysis was performed with and without inclusion of the maternal effect. Models were compared based on the deviance information criterion and LPM_cNPS including maternal effects was found to be the best model. The h(2) estimates and standard deviation obtained using model LPM_cNPS were 0.19 +/- 0.08, 0.21 +/- 0.08, 0.22 +/- 0.09, and 0.21 +/- 0.07 for earnings at 2, 3, and 4 years of age and total career, respectively. Our analyses indicate that earnings are subject to selection and can be included in breeding programs to improve the racing performance of Quarter Horses.

Efeito agudo de diferentes volumes de alongamento estático na contração voluntária máxima de idosas

Several studies have shown that different stretching routines can lead to decreases on acute neuromuscular system performance. Although the deficit in muscle strength mediated by different methods of stretching has been systematically observed, few studies have investigated the possible existence of a dose-response relationship between the amount of stretching and muscle strength deficit in older adults. In this context, the objective of this study was to investigate the acute effect of two different stretching volumes on isometric force-time curve (Cf-t) in elderly women. The study included 13 older women (64.08 ± 4.27 years, 69.98 ± 10.56 kg, 157.90 ± 8.66 cm, 28.25 ± 4.22 kg/m²). The participants visited the laboratory for five consecutive days, among which the first two were used for familiarization. During the other three days the participants underwent experimental conditions: control (C) stretch 30 seconds (AE30) and stretch 60 seconds (AE60). For the AE30 and AE60 conditions, three series of passive static stretching were performed, with duration of 30 and 60 seconds, respectively. The experimental conditions were performed with an interval of at least 24 hours between them and the order of execution was randomized. The recording of isometric Cf-t of the knee extensor muscles was performed in extensor chair connected to a force transducer. Measurements were recorded immediately after each experimental condition, for five seconds. For statistical analysis, descriptive procedures were used and ANOVA one way to check possible changes on the Maximal Voluntary Contraction (CVM) and Peak Rate of Force Development (TDFP) among the three conditions (p <0.05). The ANOVA showed no statistically significant difference for CVM and TDFP, between the three conditions. It can be concluded that different volumes of static stretching, three sets ...(Complete abstract click electronic access below)

Tomografia por Biosusceptometria de Corrente Alternada (tBAC): desenvolvimento, caracterização, implementação

The Biosusceptometry AC (BAC) is a research tool that has been extensively explored by the group Biomagnetism IBB-UNESP for monitoring of the gastrointestinal tract, its response to a known drug or in vivo performance of solid dosage forms. During this period the BAC, which has the characteristics of high sensitivity and low cost, has been developed primarily for recording signals contraction of activity and traffic human gastrointestinal tract. With the possibility of producing images with this instrumentation, it was possible to evaluate different situations in vitro and in vivo for physiological studies and pharmaceuticals. Considering the good performance of this system to produce planar images, the first aim of the BAC system tomography (TBAC) was to evaluate the system performance of BAC to produce tomographic images of phantoms ferromagnetic for a single channel system. All these applications were only possible because of their sensitivity to materials of high magnetic suscepitibility as ferrite, which allow to produce an electrical signal proportional to the variation of the magnetic flux generated by the presence of magnetic marker next to a first-order gradiometer. Measuring this variation at various points was possible to generate planar images that recently came to be produced in systems with multiple detectors, said multi-channels. From planar images, also producing tomographic images of simulators BAC bars in a system of 13 channels using only the center channel, with good results when applied to simple objects as one and two bars. When testing the resolution of the system with more elaborate forms the quality and resolution of images reconstructed is not satisfactory, which would be solved by increasing the spatial sampling rate and hence the acquisition time. The present system works with an acquisition time of about five hours. Whereas this system will be applied for in vivo experiments, the acquisition time became a ...

Automatic classification of prostate stromal tissue in histological images using Haralick descriptors and Local Binary Patterns

In this paper we presente a classification system that uses a combination of texture features from stromal regions: Haralick features and Local Binary Patterns (LBP) in wavelet domain. The system has five steps for classification of the tissues. First, the stromal regions were detected and extracted using segmentation techniques based on thresholding and RGB colour space. Second, the Wavelet decomposition was applied in the extracted regions to obtain the Wavelet coefficients. Third, the Haralick and LBP features were extracted from the coefficients. Fourth, relevant features were selected using the ANOVA statistical method. The classication (fifth step) was performed with Radial Basis Function (RBF) networks. The system was tested in 105 prostate images, which were divided into three groups of 35 images: normal, hyperplastic and cancerous. The system performance was evaluated using the area under the ROC curve and resulted in 0.98 for normal versus cancer, 0.95 for hyperplasia versus cancer and 0.96 for normal versus hyperplasia. Our results suggest that texture features can be used as discriminators for stromal tissues prostate images. Furthermore, the system was effective to classify prostate images, specially the hyperplastic class which is the most difficult type in diagnosis and prognosis.

Análise técnica, econômica e ecológica do uso de biogás em célula a combustível de óxido sólido (SOFC)

Pós-graduação em Engenharia Mecânica - FEG

Analisys of thermal efficiency of a modified solar collector type evacuated tube

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)