Navegando por Autor "Mini, Raquel Aparecida de Freitas"
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Item Um algoritmo de amostragem multivariada para redes de sensores sem fio.(2010) Silva Junior, Orlando; Aquino, André Luiz Lins de; Mini, Raquel Aparecida de FreitasA wireless sensor network (WSN) is energy constrained, and the ex-tension of its lifetime is an important issue in its design. A WSN can be used to collect and process data of environment that can be, in some cases, multivariate. In this way, to help the data processing, this work proposes a multivariate sampling algorithm which uses component analysis techniques to rank the data and then to select only the data more relevant to the application. Simulation results show that our technique reduces the data keeping its representativeness. In addition, the energy consumption and delay on the network are reduced.Item Multivariate reduction in wireless sensor networks.(2009) Silva Junior, Orlando; Aquino, André Luiz Lins de; Mini, Raquel Aparecida de Freitas; Figueiredo, Carlos Maurício SeródioIn wireless sensor networks, energy consumption is generally associated with the amount of sent data once communication is the activity of the network that consumes more energy. This work proposes an algorithm based on "Principal Component Analysis "to perform multivariate data reduction. It is considered air quality monitoring scenario as case study. The results show that, using the proposed technique, we can reduce the data sent preserving its representativeness. Moreover, we show that the energy consumption and delay are reduced proportionally to the amount of reduced dataItem Redes de sensores sem fio para monitoramento de anfíbios.(2008) Aquino, André Luiz Lins de; Figueiredo, Carlos Maurício Seródio; Loureiro, Antônio Alfredo Ferreira; Mini, Raquel Aparecida de Freitas; Nakamura, Eduardo Freire; Oliveira, Horácio Antônio Braga Fernandes de; Ruiz, Linnyer Beatrys