Estudo avaliativo de um algoritmo genético auto-organizável e multiobjetivo utilizando aprendizado de máquina para aplicações de telecomunicações

This paper presents an evaluative study about the effects of using a machine learning technique on the main features of a self-organizing and multiobjective genetic algorithm (GA). A typical GA can be seen as a search technique which is usually applied in problems involving no polynomial complexity. Originally, these algorithms were designed to create methods that seek acceptable solutions to problems where the global optimum is inaccessible or difficult to obtain. At first, the GAs considered only one evaluation function and a single objective optimization. Today, however, implementations that consider several optimization objectives simultaneously (multiobjective algorithms) are common, besides allowing the change of many components of the algorithm dynamically (self-organizing algorithms). At the same time, they are also common combinations of GAs with machine learning techniques to improve some of its characteristics of performance and use. In this work, a GA with a machine learning technique was analyzed and applied in a antenna design. We used a variant of bicubic interpolation technique, called 2D Spline, as machine learning technique to estimate the behavior of a dynamic fitness function, based on the knowledge obtained from a set of laboratory experiments. This fitness function is also called evaluation function and, it is responsible for determining the fitness degree of a candidate solution (individual), in relation to others in the same population. The algorithm can be applied in many areas, including in the field of telecommunications, as projects of antennas and frequency selective surfaces. In this particular work, the presented algorithm was developed to optimize the design of a microstrip antenna, usually used in wireless communication systems for application in Ultra-Wideband (UWB). The algorithm allowed the optimization of two variables of geometry antenna - the length (Ls) and width (Ws) a slit in the ground plane with respect to three objectives: radiated signal bandwidth, return loss and central frequency deviation. These two dimensions (Ws and Ls) are used as variables in three different interpolation functions, one Spline for each optimization objective, to compose a multiobjective and aggregate fitness function. The final result proposed by the algorithm was compared with the simulation program result and the measured result of a physical prototype of the antenna built in the laboratory. In the present study, the algorithm was analyzed with respect to their success degree in relation to four important characteristics of a self-organizing multiobjective GA: performance, flexibility, scalability and accuracy. At the end of the study, it was observed a time increase in algorithm execution in comparison to a common GA, due to the time required for the machine learning process. On the plus side, we notice a sensitive gain with respect to flexibility and accuracy of results, and a prosperous path that indicates directions to the algorithm to allow the optimization problems with "η" variables

Conhecimento sobre energia eólica: um estudo exploratório a partir das redes semânticas naturais de estudantes da cidade de Natal

The human being has a fundamental role in issues concerning scarcity of energy resources as well as in the success of technologies which favor the use of renewable sources, such as wind energy. But what does wind energy mean for people? What are the psychological meanings concerning this term? Aiming to answer these questions, the general objective of this dissertation was to identify and to analyze the knowledge about wind energy taking into account a network of psychological meanings. One hundred and ninety one (191) university students from Natal-RN participated in the study, being male the majority (53%); aged between 17 and 51 years old (M=23.3 years; SD=5.7). Participants responded to self reports using the Natural Semantic Networks (NSW) technique, as well as to several sociodemographic questions. The results showed a consistent, positive and useful general semantic network. In this semantic network, knowledge about wind energy was represented by words that correspond to the appeal of (pro) environmental stance (e.g., clean and nature), that evinced both the technological aspect (e.g., force) and the economic aspect (e.g., economy). Results from different groups were also analyzed. The first set of groups (non-environemental and environmental) was divided considering the course (e.g., ecology and economy). The second set of groups(non-caretaker and caretaker) was divided based on the practice of environmental care expressed. Subtle differences were observed in the semantic networks of caretakers, who emphasized environment, an attribute not mentioned by non-caretakes. This indicates a construction of knowledge that is influenced by the presence or absence of the environmental commitment. Such findings may be useful in the construction of instruments for surveys and in the development of public and educational policies. Additionally, they may assist the media towards a more objective performance concerning wind energy

Diabetes auto-referido em idosos: prevalência, fatores associados e práticas de controle

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

Avaliação do conhecimento, formação e capacitação do TSB e ASB no desenvolvimento das atividades no serviço público de saúde

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

A produção de conhecimento científico da educação física na Sociedade Brasileira para o Progesso da Ciência (SBPC)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Kant e Habermas: a relação sujeito-objeto e a construção do conhecimento

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Processos auto-organizados: efeitos de substâncias químicas que agem no sistema nervoso sobre o desenvolvimento e padrão de dispersão larval pós-alimentar de dípteros (Calliphoridae e Muscidae)

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

O conceito de organismo: uma introdução à epistemologia do conhecimento biológico na formação de graduandos de biologia

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Tecnologias, mídias, criação e hipertextualidade na transformação da informação em conhecimento interativo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Práticas de subjetivação e construção identitária: o sujeito no entremeio da auto-ajuda e da ciência

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Violência contra a criança: formação, conhecimento, percepção e atitude de profissionais da saúde e da educação

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Processos auto-organizados em agregados de larvas de moscas-varejeiras em dispersão pós-alimentar: experimentação, modelagem e validação

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

Percepção dos portadores de hanseníase acerca do auto cuidado

This study aimed at evaluating the perception of leprosy patients, the disease, with regard to its concept and self-care practice, as well as their knowledge concerning drug therapy. Fifteen patients participated in the study, of whom 11 were classified as multibacillary and 04 as paucibacillary. Semi-structure interviews containing six guiding questions were used for data collection, and the Collective Subject Discourse (CSD) was utilized as a theoretical framework. Analysis was performed based on the Theory of Complexity. It showed that patients suffer pain, a fact that is reflected on the need to change habits and prevent disability. It also showed that patients have doubts and feel insecure about treatment and prognosis, and that they are also the target of social prejudice even thought the term leprosy has been replaced by Hansen‟s disease. As regards self-care, the subjects showed lack of autonomy, limitations and subjection to instructions from health care professionals, who, according to the discourse that emerged, are mostly responsible for transmitting the knowledge concerning self-care practice. This fact can be explained by evidence of self-knowledge deficit by the the subjects. Concerning polychemotherapy treatment, which is recommended by the Ministry of Health, it was observed that the knowledge concerning its action and adverse effects is precarious. This information is provided during consultation; however, CSD showed that the subjects do not apprehend it. Therefore, health care professionals must instruct their clients not only as regards conventional treatment practices, but they must also help them to know themselves and to improve their critical judgment so that they can choose the best form of living after being diagnosed with the disease, thus guiding self-care by taking such choice into account

Conhecimento e atitudes da área da saúde frente ao risco de contaminação por hepatites ao fazer as unhas

Pós-graduação em Saúde Coletiva - FMB

Análise de teses internalistas subjacentes à modelagem computacional da mente em uma perspectiva situada, incoporada e auto organizada

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