Navegando por Assunto "Wireless sensor networks"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Otimização de cobertura, consumo de energia, roteamento e agregação de dados em rede de sensores sem fio utilizando algoritmos genéticos e lógica fuzzy
(Universidade Federal do Pará, 2011-03-04) NUNES, Thiêgo Maciel; MONTEIRO, Dionne Cavalcante; http://lattes.cnpq.br/4423219093583221; CERQUEIRA, Eduardo Coelho; http://lattes.cnpq.br/1028151705135221
The Wireless Sensor Networks (WSN) have limited capacities for processing, storage, communication (bandwidth) and power source, besides having features and basic requirements of a WSN such as: the need for self-organization, communication with diffusion of short-range and multihop routing. This work proposes a tool that optimizes the positioning and the packages delivered through the use of Genetic Algorithm (GA). To resolve the routing problem that improves power consumption and maximize data aggregation is proposed the use of fuzzy logic in the routing protocol Ad hoc Ondemand Distance Vector (AODV). This customization is entitled AODV - Fuzzy for Wireless Sensor Networks (AODV-FWSN). The results show that the proposed solution is efficient and can prolong the life of the WSN and improve the rate of data delivery when compared to similar solutions.
Acesso aberto (Open Access)
Projeto e implementação de um nodo sensor para aquisição de sinais de extensômetros em redes de sensores sem fio aplicado ao monitoramento de deformações em estruturas
(Universidade Federal do Pará, 2012-07-09) ATAÍDE, Rodrigo Williams Rodrigues; KLAUTAU JÚNIOR, Aldebaro Barreto da Rocha; http://lattes.cnpq.br/1596629769697284
This dissertation’s main objective is to propose a node wireless sensor for use in wireless sensor networks, in data strain gage acquisition systems. The acquisition system for the strain is based on the Wheatstone bridge and enables various settings. The processing and wireless communication is performed by ATmega128RFA1, composed of a microcontroller and a radio-frequency transceiver with the Zigbee standard. The node is designed to ensure reliability in data acquisition and be fully controlled remotely. Among the controllable parameters are: the signal gain and sampling rate. In addition, the node has resources to make the balance of the Wheatstone bridge automatically. The choice of components, based on criteria related to energy consumption and cost the same. It was designed a printed circuit board (PCB) for the node, and regarding it, estimates of energy consumption and value of the prototype were made, with the aim of analyzing its viability. Besides the design of the sensor node, the dissertation presents the proposal of its integration in a wireless sensor network (WSN), including the suggestion of complementary hardware and software developments. For testing, a node sensor was constructed experimentally and used a force transducer.
Acesso aberto (Open Access)
Uso de redes de sensores sem fio no monitoramento do comportamento nictemeral do caranguejo-uçá (Ucides cordatus Linnaeus, 1763)
(Universidade Federal do Pará, 2020-12-18) CARDOSO, Gracielly Costa Fontes; LEMOS, Marcus Vinicius de Sousa; http://lattes.cnpq.br/3407671588647224; FÜLBER, Heleno; http://lattes.cnpq.br/5018616409948511
Wireless Sensor Networks (RSSF) have been applied in environments with dif erent contexts. One of the advantages of its use is low intrusion, made possible by remote monitoring that allows the observation of data without the need for invasion of the habitat of some species. In this article, we present the design and implementation of an RSSF that monitors environmental variables and the behavior of the uçá crab (Ucides cordatus). According to the results obtained in the study, it was identified that the WSN are suitable for collecting data in the mangrove ecosystem ef iciently. Such information can be used in decision-making by regulatory agencies that manage the management of this resource.