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Ambiente h?brido para avalia??o de redes sem-fioSilvano, Gilles Velleneuve Trindade 04 September 2017 (has links)
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Previous issue date: 2017-09-04 / Redes sem-fio t?m evolu?do consideravelmente nos ?ltimos anos e consequentemente
tem sido aplicadas nos mais diversos cen?rios, desde redes locais sem-fios at? redes de
sensores sem-fios para Internet das Coisas (Internet of Things - IoT). Cada nova aplica??o
apresenta suas pr?prias caracter?sticas, especificidades e consequentemente novos desafios
que devem ser vencidos para que ela se torne vi?vel e seja enviada para produ??o e
embarcada em dispositivos reais. Por?m, os simuladores de redes em geral n?o fornecem algumas importantes funcionalidades
para as simula??es e avalia??es de aplica??es de redes sem-fio. Por exemplo, os
simuladores exigem implementa??o da aplica??o direcionada para o ambiente do simulador
exigindo o dobro de esfor?o dos desenvolvedores e problemas de integra??o entre
as tecnologias utilizadas durante os testes e as utilizadas para embarcar a aplica??o em
dispositivos reais. Al?m disso, os simuladores devem dar suporte a em cen?rios mais
complexos de redes sem-fio como ambientes com alta mobilidade ou alta densidade de
n?s. Por fim, o comportamento simulado por softwares e n?o na an?lise de dispositivos
reais utilizando c?digo final, compilado para os dispositivos reais finais, n?o fornece a
melhor visualiza??o do comportamento da aplica??o simulada. Para preencher essas lacunas desenvolvemos o LVWNet: um ambiente e simula??o
baseado em virtualiza??o Linux para a avalia??o de aplica??es de redes sem-fio que oferece
suporte a simula??o de c?digo real e ambiente h?brido de integra??o entre n?s virtuais
e dispositivos reais, al?m de flexibilidade e baixo consumo de recursos. Nesse trabalho
s?o apresentados os detalhes de implementa??o do LVWNEt e suas funcionalidades b?sicas
atrav?s da simula??o de uma rede sem-fio IEEE 802.11s em um ambiente h?brido
com suporte a mobilidade, no qual foram desenvolvidos testes para avaliar a autenticidade
dos dados de simula??o obtidos durante os testes que comprovaram sua efici?ncia como
ambiente de avalia??o de redes sem-fios. / Wireless networks have evolved considerably in recent years and have consequently
been applied in a wide range of scenarios, from wireless local area networks to Internetof-
Things (IoT) wireless sensor networks. Each new application presents its own characteristics,
specificities and consequently new challenges that must be overcome in order
for it to become viable and be sent to production and shipped to real devices. However, network simulators generally do not provide some important functionalities
for the simulations and evaluations of wireless applications. For example, simulators require
implementation of the application targeted to the simulator environment requiring
twice the effort of the developers and problems of integration between the technologies
used during the tests and those used to ship the application to real devices. In addition,
simulators must support in more complex scenarios of wireless networks such as environments
with high mobility or high node density. Finally, software-simulated behavior
rather than real device analysis using final code, compiled for the final real devices, does
not provide the best visualization of simulated application behavior. To fill these gaps we have developed LVWNet: a Linux-based virtualization-based
simulation and environment for evaluating wireless network applications that supports
real-world simulation and hybrid integration between virtual nodes and real devices, as
well as flexibility and low resource consumption. This paper presents the implementation
details of the LVWNEt and its basic functionalities through the simulation of an IEEE
802.11s wireless network in a hybrid environment with mobility support, in which tests
were developed to evaluate the authenticity of the simulation data obtained during the
tests that have proven their efficiency as evaluation environment of wireless networks.
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Soft sensor veicular para medi??o de emiss?es de gasesOliveira, J?lio C?sar Melo Gomes de 19 December 2017 (has links)
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Previous issue date: 2017-12-19 / Historicamente as cidades seguem modelos de planejamento reativos onde o gestor toma decis?es conforme a ocorr?ncia dos problemas. Por outro lado, o crescimento exponencias das Tecnologias da Informa??o e Comunica??o (TIC) tem permitido que diversos sensores, dispositivos, sistemas e objetos se conectem, gerando dados que podem ser transformados em informa??o e usados em um paradigma de planejamento urbano mais eficiente onde as decis?es podem ser tomadas antes que os problemas ocorram. Assim, nesse trabalho ser? desenvolvido um software capaz de estimar a quantidade de di?xido de carbono, a partir de leituras de sensores existentes em ve?culos, que ir? contribuir para o planejamento proativo das cidades a partir do monitoramento da polui??o veicular. T?cnicas de CrowdSensing e um leitor On-Board Diagnostic (OBD-II) ser?o utilizados para extrair dados dos ve?culos em tempo real, armazenados localmente nos aparelhos que foram coletados. Por fim, podemos ver que a partir das informa??es obtidas, existe a possibilidade de se extrair informa??es a respeito do funcionamento do ve?culo e at? mesmo realizar infer?ncias sobre a din?mica dos ve?culos nas cidades, mostrando potencial para o desenvolvimento de ferramentas auxiliares a gest?o dos centros urbanos. / Traditionally, cities planning has followed reactive decision models based on the occurrence
of problems. With the development and spread of communication and information
technologies, the interconnection of electronic devices has opened a new era of data
exchanging and processing, potentially supporting more efficient decisions in modern cities.
This paper then proposes a software, capable of estimating the amount of carbon
dioxide from existing sensor readings in vehicles, which aims to support more proactive
planning and management of modern cities, addressing the problem of vehicular pollution
monitoring. For that, a crowdsensing approach and the OBD-II standard are exploited to
dynamically extract data from vehicles to be processed and delivered. Finally, we can see
that with the information obtained, it is possible to extract information about the operation
of the vehicle and even make inferences about the dynamics of the vehicles in the cities,
showing potential for the development of auxiliary tools for the management of urban
centers .
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Obten??o de par?metros construtivos para antenas de microfita utilizando o M?todo Taguchi de otimiza??oLira, Ruann V?ctor de Andrade 24 November 2017 (has links)
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Previous issue date: 2017-11-24 / As aplica??es de antenas de microfita abrangem uma grande ?rea das Telecomunica??es,
principalmente em sistemas que necessitem de componentes de volume e peso
reduzido, como comunica??es aeroespaciais. Da? in?meros pesquisadores t?m estudado,
cada vez mais, t?cnicas de otimiza??o no projeto dessas antenas. Assim, esse trabalho
tem como principal objetivo a otimiza??o de projeto de antenas de microfita. Para isso,
utiliza-se o M?todo Taguchi no qual cada par?metro f?sico ? definido a partir da frequ?ncia
de opera??o desejada pelo usu?rio, das caracter?sticas el?tricas do diel?trico que ser?
utilizado para fabricar a antena (espessura do substrato e constante diel?trica do material)
e da defini??o dos limites de otimiza??o (valores m?ximo e m?nimo) que os par?metros
f?sicos podem atingir. Especificamente, a an?lise usa o m?todo Taguchi com tratamento
dos limites, para que o valor final otimizado n?o fique fora da faixa especificada. Na
an?lise, s?o considerados patches retangulares e circulares, para projetos nas faixas de
frequ?mcia especificas para WLAN. No trabalho, s?o apresentados resultados num?ricos
e experimentais para a perda de retorno. S?o feitas compara??es entre esses resultados.
Uma boa concord?ncia entre os resultados ? observada. S?o apresentadas, ainda, sugest?es
de continuidade do trabalho. / The applications of microstrip antennas cover a large area of Telecommunications,
especially in systems that require components of volume and reduced weight, such as
aerospace communications. Hence numerous researchers have been studying, more and
more, techniques of optimization in the design of these antennas. Thus, this work has
as main objective the optimization of microstrip antenna design. For this, the Taguchi
Method is used in which each physical parameter is defined from the frequency of operation
desired by the user, of the electric characteristics of the dielectric that will be used
to make the antenna (substrate thickness and dielectric constant of the material) and definition
of optimization limits (maximum and minimum values) that physical parameters
can achieve. Specifically, the analysis uses the Taguchi method with boundary treatment
so that the optimum final value does not fall outside the specified range. In the analysis,
rectangular and circular patches are considered for projects in the frequency bands specific
to WLAN. In the paper, numerical and experimental results are presented for loss
of return. Comparisons are made between these results. A good agreement between the
results is observed. Suggestions for continuity of work are also presented.
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Guardi?o Cloud - plataforma de apoio para internet das coisas / Guardi?o Cloud - support platform for internet of thingsCantanhede, Romulo Fagundes 27 April 2016 (has links)
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Previous issue date: 2016-04-27 / A IoT (Internet of Things) prop?e que sistemas computacionais sejam formados por diversos dispositivos produtores e/ou consumidores de informa??o, permitindo o desenvolvimento de diversas solu??es baseadas na coleta e an?lise de dados. Por?m, al?m da coleta e an?lise de dados, ? necess?rio tamb?m tomar decis?es e agir com base nas mesmas. Nossa proposta ? de desenvolver uma plataforma de suporte para aplica??es de IoT permitindo n?o somente a coleta e an?lise de dados, mas tamb?m seu uso para a tomada de decis?o e a??o. A plataforma permite que qualquer dispositivo com acesso ? Internet possa enviar informa??es em formato variado, suportando o acompanhamento em tempo real dos dados coletados, assim como a defini??o de mecanismos de tomada de decis?o, como a ativa??o de um determinado dispositivo ou a gera??o de alertas. Como estudo de caso, a plataforma foi aplicada para monitorar um ambiente hospitalar. Alguns experimentos controlados foram realizados com o objetivo de avaliar a plataforma, permitindo a defini??o de alguns par?metros de dimensionamento para sua implanta??o. / The IoT(Internet of Things) proposes that computer systems are formed by several
information producers and/or consumer devices, allowing the development of
various solutions based on data collection and analysis. However, in addition to
data collection and analysis, it is also necessary to make decisions and act on them.
This work?s proposal is to develop a support platform for IoT applications, not
only allowing data collection and analysis, but also their use for decision making
and action. The platform will allow any device with Internet access to send information
in various formats, supporting real-time monitoring of the collected data,
as well as the definition of decision-making mechanisms, such as the activation
of a particular device or the generation of alerts. As a case study, the platform
was applied to monitor a hospital style environment. Some controlled experiments
were conducted to evaluate the platform, providing the means for the definition of
some design parameters for its deployment.
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Modelo de desenvolvimento intelectual para agentes rob?ticosMaia, Rosiery da Silva 18 December 2012 (has links)
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Previous issue date: 2012-12-18 / IDeM-MRS ? um modelo com regras formais para gerenciar a coopera??o de um
grupo de rob?s, quando aplicados em resolu??o de tarefas. Esse formalismo ? totalmente
baseado em modelos sociais de aprendizagem de indiv?duos reais e coordena eficientemente
o sistema multirrob?, propiciando a Assimila??o e Acomoda??o do conhecimento
atrav?s de trocas de experi?ncias entre os componentes do grupo. Algumas quest?es foram
particulamente tratadas, como uma representa??o realista do ambiente multirrob?
(que envolve a miss?o global, as tarefas que pertencem a essa miss?o e os rob?s atuantes)
e uma forma de sele??o de tarefas, baseada em teorias de abordagens socias de aprendizagem,
como as pregadas por Lev Vygotsky, Jean Piaget e John Watson. Essas teorias,
j? consolidadas para indiv?duos reais, permitem a execu??o cooperativa eficiente pelos
rob?s. IDeM-MRS pode ser usado em diferentes tipos de miss?es, desde as mais simples
?s mais complexas. Os experimentos e resultados validam a efici?ncia dessa proposta em
compara??o a um modelo emp?rico tradicional. / IDeM-MRS is a model with formal rules to manage the cooperation of multi-robot
systems, if it is applied in tasks execution. This formalism is completely based on learning
social models of real individuals and efficiently coordinates the group allowing
knowledge assimilation and accommodation through experiences exchange among the
group components. Some issues are particularly investigated, such as the realist multirobot
environment representation (involving the global mission, the tasks that belong to
this mission and the active robots) and a task selection form based on theories and social
learning approaches, such as theories of Lev Vygotsky, Jean Piaget and John Watson. Its
theories already consolidated to real individuos, allows the cooperative execution efficient
by robots. IDeM-MRS can be used for different types of missions, from the simplest to
more complex ones. The experiments and results validate the effectiveness of this formalism
compared to the traditional empirical model.
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Redu??o do consumo energ?tico de aplica??es paralelas em arquiteturas multi-coreBarros, Carlos Avelino de 13 July 2016 (has links)
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Previous issue date: 2016-07-13 / O per?odo que durou do surgimento dos microprocessadores at? o in?cio deste s?culo ficou
marcado pela expans?o geom?trica da frequ?ncia de opera??o desses dispositivos. Se por
um lado isso proporcionou aumentos cont?nuos do desempenho, tamb?m foi respons?vel
por um crescimento problem?tico do aquecimento e do consumo de energia. No sentido de
atenuar esses problemas, os processadores multi-core passaram a substituir extensivamente
os processadores single-core, oferecendo uma alternativa vi?vel para aumentar o desempenho
sem o aumento da frequ?ncia. Como uma das formas de se mapear o consumo de
energia, apresentamos o desenvolvimento de dois conjuntos de modelos matem?ticos para
a representa??o da pot?ncia el?trica dissipada nos processadores. De acordo com considera??es
feitas em rela??o a suas parcelas est?tica e din?mica, estabelecemos a pot?ncia
total como vari?vel dependente da frequ?ncia de opera??o dos respectivos processadores
analisados. Demonstramos, a partir desses modelos matem?ticos, que o consumo relativo
de energia dos processadores pode ser associado a medidas de desempenho empregadas em
processamento paralelo, como speedup e efici?ncia. Tamb?m utilizamos os modelos para monitorar
a influ?ncia de diversos fatores na redu??o do consumo de energia nos processadores
multi-core, tais como o percentual da por??o paralela do c?digo, a quantidade de n?cleos a
ser empregado de cada vez, a frequ?ncia de trabalho e o pr?prio speedup. Os resultados
das an?lises, em simula??es e em hardware, confirmam as previs?es te?ricas e despertam a
possibilidade de melhorar o desempenho energ?tico dos processadores multi-core, sobretudo
nas condi??es em que os fatores de influ?ncia podem ser flexibilizados. / The period that lasted from the advent of microprocessors until early this century was
marked by the geometric expansion of their operating frequency. If on one hand it
provided continuous performance increases, on the other hand it was also responsible
for a problematic growth in heating and energy consumption. In attempt to mitigate
these problems, multi-core processors have been used extensively in replacement for singlecore
processors, offering a viable alternative to increase performance without increasing
frequency. As a way of mapping energy consumption, we present the development of two
sets of mathematical models for the representation of the electrical power dissipated in
the processors. According to considerations we made in relation to static and dynamic
parts of the power, we established an equation for the total power as a function of the
operating frequency of the respective analyzed processors. We demonstrate, based on these
mathematical models, that the relative energy consumption of processors can be related to
parallel processing performance measures, such as speedup and efficiency. We also use the
models to monitor the influence of several factors on the reduction of energy consumption
in multi-core processors, such as the percentage of the parallel portion of the code, the
number of cores to be used each time, the working frequency and speedup itself. Results of
the analyzes confirm the theoretical predictions and alert to the possibility of improving
the energy performance of multi-core processors, especially in conditions in which the
factors of influence can be made flexible.
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Estudo do conceito de serendipidade como base para novas abordagens ao problema da converg?ncia prematuraPaiva, F?bio Augusto Proc?pio de 01 July 2016 (has links)
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Previous issue date: 2016-07-01 / Em muitos problemas de engenharia, ? comum o estudo de um tipo de processo que se comporta, via de regra, como um sistema din?mico. Esse tipo de sistema possui a peculiaridade de poder ser modelado por meio de um conjunto de equa??es que evolui ao longo do tempo para representar o comportamento modelado do sistema. Para resolver esses problemas de engenharia, diversos m?todos de Computa??o Bio-inspirada v?m sendo propostos como solu??o em diferentes contextos. Entre esses m?todos, est? uma categoria de algoritmos conhecida como Intelig?ncia de Enxames. Apesar do relativo sucesso, a maioria dos m?todos bio-inspirados enfrenta um problema muito comum conhecido como converg?ncia prematura. A converg?ncia prematura ocorre quando um enxame (ou uma popula??o) perde a sua capacidade de gerar diversidade e, como consequ?ncia, converge para uma solu??o sub-?tima, prematuramente. Na literatura, existem diversas abordagens que se prop?em a resolver esse problema. Esta tese prop?e uma nova abordagem que ? baseada em um conceito chamado serendipidade que, normalmente, ? aplicado no dom?nio dos Sistemas de Recomenda??o. Para avaliar a viabilidade da adapta??o desse conceito ao novo contexto, uma variante chamada Serendipity-Based Particle Swarm Optimization (SBPSO) foi implementada e, posteriormente, comparada com a Particle Swarm Optimization (PSO) padr?o e algumas variantes apresentadas na literatura. Para realizar os diversos experimentos computacionais, foram utilizadas 16 fun??es de benchmark bastante comuns. Em todos os experimentos, os resultados da SBPSO se mostraram promissores e apresentaram um bom comportamento de converg?ncia, superando a PSO padr?o e as variantes estudadas no que diz respeito ? qualidade da solu??o, ? capacidade de encontrar o ?timo global, ? estabilidade das solu??es e ? capacidade de reiniciar o movimento do enxame ap?s a estagna??o ter sido detectada. / IN the literature, it is common to find many engineering problems which are used to present the
effectiveness of the optimization algorithms. Several methods of Bio-Inspired Computing have
been proposed as a solution in different contexts of engineering problems. Among these methods,
there is a class of algorithms known as Swarm Intelligence. Despite the relative success, most of
these algorithms faces a common problem known as premature convergence. It occurs when a
swarm loses its ability to generate diversity and consequently converges to a suboptimal solution
prematurely. There are several approaches proposed to solve this problem. This doctoral thesis
proposes a new approach based on a concept called serendipity. It is usually applied in the field
of Recommender Systems. To validate the feasibility of adapting this concept to the new context,
a variant called Serendipity-Based Particle Swarm Optimization (SBPSO) has been implemented
considering two dimensions of serendipity: chance and sagacity. To evaluate the presented proposal,
two sets of computer experiments were performed. Sixteen reference functions which are
common in the evaluation of optimization algorithms were used. In the first set of experiments,
four functions were used to compare SBPSO to Particle Swarmoptimization (PSO) and some literature
variants. In the second ones, twelve other functions were used, but for high dimensionality
and a larger number of evaluations of the objective function. In all experiments, the results of the
SBPSO were promising and presented a good convergence behaviour with regard to: a) quality of
the solution, b) ability to find the global optimum, c) stability of solutions and d) ability to resume
the swarmmovement after stagnation has been detected.
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Sistema de an?lise de sinal card?aco para aplica??o em telecardiologiaArrais J?nior, Ernano 26 August 2016 (has links)
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Previous issue date: 2016-08-26 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Os problemas cardiovasculares est?o entre as principais causas de mortandade no
mundo. Estima-se que cerca de 15 % da popula??o mundial vem a ?bito devido a problemas
cardiovasculares. No Brasil esse n?mero equivale a quase 30 % dos casos de
morte, sendo os homens os mais afetados por doen?as cardiovasculares, apresentando um
percentual de aproximadamente 60 % das v?timas. Outro fator alarmante, ? que o Brasil
est? entre os 10 pa?ses com maior ?ndice de morte por doen?as cardiovasculares. Os problemas
cardiovasculares s?o oriundos do mal funcionamento do cora??o e das art?rias,
sendo os mais comuns o infarto, o acidente vascular cerebral (AVC), arritmias card?acas
e isquemias. Assim, se faz necess?rio um bom acompanhamento das atividades card?acas,
a fim de evitar poss?veis transtornos oriundos de problemas cardiovasculares. Nos
?ltimos anos, diversas solu??es no ?mbito da telecardiologia v?m sendo discutidas para a
redu??o destes n?meros, al?m de propor um melhor acompanhamento de indiv?duos (pacientes)
e aux?lio ?s unidades b?sicas de sa?de localizadas distantes dos grandes centros.
Neste trabalho, ser? apresentado um sistema para an?lise de sinais de eletrocardiograma
(ECG) aplicado ? telecardiologia, objetivando a valida??o de dados cl?nicos cardiol?gicos,
especificamente arritmias card?acas (bradicardia, taquicardia e contra??o ventricular
prematura). A ferramenta matem?tica utilizada para an?lise dos sinais ECG ? a Transformada
Wavelet Discreta Redundante (TWDR), sendo implementada uma vers?o para
an?lise em tempo-real, e o m?todo utilizado para a aferi??o das caracter?sticas ? o m?todo
baseado em thresholds. Ent?o, de posse deste sistema de caracteriza??o do sinal ECG,
pode-se validar laudos cl?nicos cardiol?gicos, ou melhor, trata-se de uma ferramenta para
aux?lio na valida??o de diagn?sticos m?dicos. Os resultados encontrados foram satisfat?rios,
o sistema apresentou Sensibilidade e Preditividade Positiva Superiores a 99 %. Ser?
apresentado tamb?m um estudo acerca das ferramentas wavelets que s?o mais indicadas
no tratamento de sinais de eletrocardiograma. / Cardiovascular problems are among the leading causes of mortality in the World. It
is estimated that about 15 % of the world population has died due to cardiovascular problems.
In Brazil this number represents almost 30 % of deaths, being the men the most
affected by cardiovascular disease, with a percentage of approximately 60 % of the victims.
Another alarming factor is that Brazil is among the 10 countries with the highest
rate of death from cardiovascular disease. Cardiovascular diseases arise from malfunction
of the heart and arteries, the most common are infarction, stroke, cardiac arrhythmias and
ischemia. Thus, if a good monitoring cardiac activity is necessary in order to prevent
possible inconvenience arising from cardiovascular disorders. In recent years, several solutions
in the framework of Telecardiology have been discussed to reduce these numbers,
in addition to proposing a better monitoring of individuals (patients) and aid to basic health
care units located far from major centers. In this work, It is proposed a system will for
ECG signal analysis applied to Telecardiology, aiming to validate cardiological clinical
data, specifically cardiac arrhythmias (bradycardia, tachycardia and premature ventricular
contraction). The mathematical tool used for analyzing ECG signals is Redundant Discrete
Wavelet Transform (RDWT), implemented a version for real-time analysis, and the
method used for measuring the ECG characteristics is the method based on thresholds.
Then, with this ECG signal characterization system it can validate cardiological clinical
reports, or rather, it is a tool to support of medical diagnostics validation. The results were
satisfactory, the system showed Sensitivity and Positive Predictivity above 99 %. It will
be presented also a study about mothers wavelet that are more appropriate in ECG signals
processing.
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Abordagem heur?stica baseada em busca em vizinhan?a vari?vel para o agrupamento balanceado de dados pelo crit?rio da soma m?nima das dist?ncias quadr?ticasCosta, Leandro Rochink 22 August 2016 (has links)
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Previous issue date: 2016-08-22 / Ap?s v?rios avan?os na tecnologia de capta??o e armazenamento de dados e do crescimento
de aplica??es que prov?m novas informa??es, o n?mero de elementos informacionais
dispon?veis ? enorme tanto em volume quanto em variedade. Com esse aumento
na quantidade de informa??es, a necessidade de entend?-los e resumi-los se tornou cada
vez mais urgente. O Agrupamento Balanceado de Dados, do ingl?s Balanced Clustering,
visa encontrar grupos de entidades similares que possuam aproximadamente o mesmo tamanho.
Neste trabalho, ? proposta uma nova abordagem heur?stica baseada na metaheur?stica
Busca em Vizinhan?a Vari?vel, do ingl?s Variable Neighborhood Search (VNS),
e na metodologia Menos ? mais, do ingl?s Less is more approach, para o problema de
agrupamento de dados usando o crit?rio da soma m?nima das dist?ncias quadr?ticas com
restri??o de balanceamento dos grupos. Os algoritmos encontrados na literatura n?o s?o
escal?veis ao passo que aumentamos o tamanho do problema para al?m de 5000 elementos
de acordo com experimentos realizados nesta pesquisa. Os experimentos computacionais
mostram que o m?todo proposto supera o atual estado da arte neste problema. / After advances in collecting and storing data and the growth in applications that provide
new information, the number of data elements available is huge in both volume and
variety. With this increase in the quantity of information, the need to understand them and
summarize them has become increasingly urgent. The Balanced Clustering seeks to find
groups of similar entities that have approximately the same size. In this dissertation, we
propose a new heuristic approach based on metaheuristic Variable Neighborhood Search
(VNS) and methodology "Less is More Approach"(LIMA) to data clustering problem
using the criterion of the minimum sum-of-squared distances applying balancing restriction
for the groups. The algorithms found in the literature are not scalable, while the
problem of increased size in addition to elements 5000 in accordance with experiments
performed in this study. The computational experiments show that the proposed method
outperforms the current state of the art for the problem.
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Antenas de microfita para 4G, 5G e arranjo de antenas cil?ndricasSilva Neto, Almir Souza e 22 August 2016 (has links)
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Previous issue date: 2016-08-22 / Nos dias atuais observa-se um grande avan?o na ?rea aeroespacial, em sistema de telemetria, sensoriamento remoto, sistemas de radar (rastreamento e monitora??o), sistemas de comunica??es via sat?lite e novas tecnologias de comunica??es de voz e dados. As antenas de microfita cada vez mais t?m sido utilizadas devido as suas caracter?sticas e vantagens. Dessa forma, este trabalho apresenta an?lises, simula??es e medi??es de antenas de microfitas para aplica??o em: redes locais sem fio WLAN (Wireless Local Area Network) com opera??o em 2,4 GHz; tecnologia de quarta gera??o 4G para o uso em 2,5 GHz; tecnologia de quinta gera??o 5G nas frequ?ncias de 28 GHz e 60 GHz; aplica??es em UWB (Ultra Wide Band) com bandas de rejei??o utilizando ressoadores de anel partido; sat?lites com opera??o na banda Ku e aplica??o em telemetria utilizando estruturas cil?ndricas operando na faixa de 2 a 4 GHz, na banda S. Foram feitas an?lises com aplica??o de estrutura EBG (Electromagnetic Band Gap) no substrato e no plano de terra, utiliza??o de substrato metamaterial, aplica??o de estruturas DGS (Defected Ground Strutures) no plano de terra e arranjos, com objetivo de obter melhoria nos par?metros, em especial ganho e largura de banda. O m?todo de an?lise das antenas de microfita utilizado neste trabalho foi o m?todo de Linha de Transmiss?o Transversa. Os resultados simulados foram obtidos atrav?s do software comercial Ansoft HFSS. Compara??es entre os resultados simulados e medidos das antenas propostas foram realizados para efeito de valida??o dos prot?tipos. Ao final, s?o apresentadas sugest?es para a continuidade deste trabalho. / Nowadays there has been a major breakthrough in aerospace, in telemetry system, remote sensing, radar systems (tracking and monitoring), satellite communications systems and new technologies for voice and data communications. The microstrip antennas have increasingly been used due to their characteristics and advantages. Thus, this work presents analysis, simulations and measurements of microstrip antenna for use in: wireless local area networks WLAN (Wireless Local Area Network) with operation at 2.4 GHz; fourth generation 4G technology for use in 2.5 GHz; fifth-generation technology 5G at frequencies of 28 GHz and 60 GHz; applications in UWB (Ultra Wide Band) with rejection bands using resonators party ring; satellites operating in the Ku band and application in telemetry using cylindrical structures operating at 2 to 4 GHz band, the S band. Analysis were made with application of EBG structure (Electromagnetic Band Gap) on substrate and in the ground plane, using substrate metamaterial, application DGS structures (Defected Ground Structures) in the ground plane and arrangements, in order to achieve improvement in the parameters, in particular gain and bandwidth. The method of analysis of microstrip antennas used in this work was the Transverse Transmission Line method. The simulated results were obtained by Ansoft HFSS commercial software. Comparisons between simulated and measured results of the antennas proposals were made for effect of validation of the prototypes. Suggestions are made for the continuity of this work.
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