Navegando por Assunto "Cluster (Sistema de computador)"

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Acesso aberto (Open Access)
Análise de propagação de ondas eletromagnéticas na faixa de microondas em ambiente indoor com método 3D FDTD e FDTD 2D modificado
(Universidade Federal do Pará, 2012-03-08) RIBEIRO, Dionisio Raony de Souza; DMITRIEV, Victor Alexandrovich; http://lattes.cnpq.br/3139536479960191
This work presents tools of low computing cost and good accuracy to characterize the electromagnetic microwave propagation in indoor environments. It was studied the Finite- Difference Time-Domain (FDTD) method applied to model the propagation in these environments. The study deals with the implementing of a new approach of this method which converses a 3D problem in a 2D one. It is presented a comparative study between the two formulation of the method regarding accuracy, speed and the requirement of computing resources. To apply the 3D formulation, a software was written in FORTRAN with the FDTD 3D parallelized by the MPI library. Then, a cluster with Beowulf architecture was set up run the routine. After the validation of the modified FDTD method, it is applied to characterize an indoor environment regarding its losses. This data was used to obtain the statistical distribution of the parameter n of propagation loss of the environment. The contribution of this work lays on the fact that the researched literature do not present the modified FDTD 2D method applied to indoor environments and the use of simulated data to statistical analysis.
Acesso aberto (Open Access)
Mitigação de interferência em redes de próxima geração utilizando técnicas de clusterização e inteligência computacional
(Universidade Federal do Pará, 2016-12-16) TORRES, Fábio de Oliveira; CARDOSO, Diego Lisboa; http://lattes.cnpq.br/0507944343674734
Due to the success of broadband networks and the growing use of smartphones, mobile operators are in search to offer the same standard of wired network services, such as speed and stability, to wireless users and thus new technologies have emerged, among them there are the Small Cells. These are small radio base stations that in relation to the macrocells present a much lower cost, however, offer a smaller space of coverage. Therefore, in a scenario where a large amount of this equipment will be installed, usually called DenseNets or dense networks, and this implementation is not carried out based on a suitable planning, numerous problems can arise, among them the co-channel interference, that in some situations, makes any type of information exchange impossible. For this reason, the model proposed in this thesis intends to assist the project analysts and solution architects in the planning of dense networks, offering, based on the information about the locations of the Small Cells, which frequency bands are appropriate for the use of each one, that so the new applications, supported by smartphones, do not suffer a degradation of signal to the point that their functions are not executed and there is an increase in the quality of the services that are offered to the users of these networks. In the tests carried out, the model showed an improvement in the traffic in more than 80% of the Small Cells, reduced the value of the delay of the switched packets and also collaborated to reduce the number of discarded packets. Nevertheless, we also analyzed the performance of the battery modules of mobile devices when the model was employed and it was noticed that it did not increase the battery consumption of these devices.
Acesso aberto (Open Access)
Stormsom: clusterização em tempo-real de fluxos de dados distribuídos no contexto de BigData
(Universidade Federal do Pará, 2015-08-28) LIMA, João Gabriel Rodrigues de Oliveira; CARDOSO, Diego Lisboa; http://lattes.cnpq.br/0507944343674734; SANTANA, Ádamo Lima de; http://lattes.cnpq.br/4073088744952858