01. Universidade Federal Rural de Pernambuco - UFRPE (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/1
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Resultados da Pesquisa
Item Análise de performance de algoritmos estocásticos aplicados ao problema do caixeiro viajante(2024-10-09) Lima, Lucas Gabriel Oliveira Sales; Monteiro, Cleviton Vinícius Fonsêca; http://lattes.cnpq.br/9362573782715504; http://lattes.cnpq.br/7636465842833021Optimization algorithms are increasingly relevant tools in modern companies because they are capable of optimizing processes and resources, ensuring more efficient results and timely processing for decision making. Comparing these algorithms is a common process during their adoption studies. However, the use of complex methodologies can often lead to the choice of an imprecise algorithm, since its result may not reflect the reality of a company seeking to implement applications with limited resources. In view of this problem, the need arises to evaluate these algorithms from a new perspective. The main objective of this work is to propose a reflection on the way experiments in algorithms are conducted. The present study carried out experiments with optimization algorithms using computational resources similar to those found in most companies, comparing them with another work in which optimizations and tunings were used in these same algorithms. For the experiment, the traveling salesman problem was used, through 15 benchmarking divided into 3 categories, according to the size of each article. Finally, statistical metrics were obtained for the performance of each algorithm, which, when compared to the reference article, showed shorter execution times without compromising the accuracy of the results. Probabilistic algorithms are of great financial importance to companies that need to manage resources quickly, such as airports and shipyards. Therefore, the appropriate choice of parameters provides a more accurate view of reality.Item Avaliação da performabilidade do sistema ferroviário da região do Recife(2024-03-08) Santos Júnior, Rodemarck Melo dos; Callou, Gustavo Rau de Almeida; http://lattes.cnpq.br/3146558967986940; http://lattes.cnpq.br/5274177344296463The rail system in the Recife region can transport approximately 400,000 passengers daily. Failure drastically decreases its carrying capacity. An example of a failure that occurs frequently is the so-called false occupancy failure. False occupancy failures occur when the train detection mechanism for part of the route is defective, forcing the driver to take manual control, increasing the risk of accidents. One of the solutions is to increase the capillarity of the railway system by adding alternative routes. In this context, this work proposes a set of models for evaluating the performability of railway systems. A case study using the Recife railway system was used to show the applicability of the proposed models, where it was possible to increase the system availability by practically 50% with the addition of alternative routes, also improving the performance metrics.Item Uma metodologia para a avaliação de desempenho e custos do treinamento de redes neurais em ambientes de nuvem(2024-03-07) Moura Filho, Cláudio Márcio de Araújo; Sousa, Érica Teixeira Gomes de; http://lattes.cnpq.br/9899077867723655; http://lattes.cnpq.br/8143173691280119Deep neural networks are solutions to problems involving pattern recognition and several works try to find ways to optimize the performance of these networks. This optimization requires suitable hardware to be implemented, hardware that can be very expensive for small and medium-sized organizations. The objective of this work is to propose a methodology to evaluate the performance and cost of training neural networks, considering the factors that most impact training time and evaluate the total financial cost of the environment for this task. In this sense, it was observed that factors such as the size of the input image and the network architecture have a great impact on the training time metric and consequently on the total cost.Item Vinculando perfis de engajamento ao desempenho acadêmico por meio de análise de redes sociais e análise de agrupamento nos dados de fóruns de discussão(2021-11-18) Oliveira, Pamella Letícia Silva de; Rodrigues, Rodrigo Lins; http://lattes.cnpq.br/5512849006877767; http://lattes.cnpq.br/8863320225621574Item Exposição à violência e desempenho escolar: um estudo sobre os estudantes do ensino fundamental na rede pública no Recife(2018) Rocha Júnior, Luciano Gomes da; Silva, Diego Firmino Costa da; http://lattes.cnpq.br/8895265465747877; http://lattes.cnpq.br/5275206790185119Peace Global Index ranks countries according a peacefulness index. In 2018 issue, from selected countries, Iceland leaders the list as most peaceful country amongst all countries 163 listed, Syria comes last. Brasil is 106th, just after Lesotho and Uzbequisthan. Recife, a northeastern city on brazilian coast, is tha 22nd most violent city in the world, with a mark of 54.96 homicide per 100,000 habitants.The worry with violence rate leads to debates envolving several concerned social actors and stakeholders, but questions as how habitants are affeted are most popular questions. In this paper, the question is precisely how are Recife teenagers affected in their school performance due to violence exposure in their home and school enviroments. Ordinary least squares methodology is applied over a Fundação Joaquim Nabuco data base that covers students in public schools in Recife, Brazil.