Sensors Networks
Mostrando 25-36 de 75 artigos, teses e dissertações.
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25. Análise experimental da aplicação da tecnologia de rádio sobre fibra em redes IEEE 802.15.4 / Analysis of applying the technology of radio-overfiber networks in IEEE 802.15.4.
This work presents an experimental investigation on the implementation of wireless sensor networks (IEEE 802.15.4) over fiber optics. Such investigation was performed with the utilization of IEEE 802.15.4 transceivers, an optical fiber infrastructure inside a field-trial network, called KyaTera Network, and directly modulated lasers and photodiodes designed
Publicado em: 2009
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26. Estudo e implementação de algoritmos inteligentes para detecção e classificação de falhas na medição de gás natural / Estudo e implementação de algoritmos inteligentes para detecção e classificação de falhas na medição de gás natural
This master dissertation presents the study and implementation of inteligent algorithms to monitor the measurement of sensors involved in natural gas custody transfer processes. To create these algoritmhs Artificial Neural Networks are investigated because they have some particular properties, such as: learning, adaptation, prediction. A neural predictor is
Publicado em: 2009
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27. An approach to inter-domain resource reservation for QoS management in next generation networks / Uma abordagem para reserva de recursos no gerenciamento de QoS entre dominios em redes de proxima geração
The technological evolution that happened on the last decades fostered the steep growth of the Internet, the creation of new Internet capable devices, like sensors and PDAs, and the creation of a multitude of online applications. This new scenario brought challenges very different from those initially considered on the creation of the Internet, so emerged th
Publicado em: 2009
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28. Wireless network in the process industries: opportunities and challenges. / Redes sem fio na indústria de processos: oportunidades e desafios.
The wireless data transmissions are part of our daily lives. The wireless network is the technology that has been most developed in the beginning of the 21st century and this evolution allowed the industry to start considering the wireless technology as a viable option to its reality. Due to that, the aim of this paperwork is to study the wireless instrument
Publicado em: 2009
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29. Protocolo ISO 11783: procedimentos para comunicação serial de dados do controlador de tarefa / ISO 11783 protocol: procedures for serial data communication with the task controller
The recent growth of automation technology and embedded electronic in agricultural machinery has established a new practice in agriculture. These new practices related to precision agriculture (PA) have demanded the use of sensors and communications embedded networks for data acquisition and control devices in the farm field. The incompatibility between hard
Publicado em: 2009
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30. Agregação e predição de dados no processamento de consultas em redes de sensores sem fio
Over the past few years, many research works in Wireless Sensor Networks (WSN) have been focused on node power saving. In order to achieve this goal, the amount of data sent over the node network should be reduced. In this work, we propose an efficient strategy that aggregates and predicts data in WSN, aiming at to reduce the data volume sent over the networ
Publicado em: 2008
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31. Cryptographic algorithms for sensor networks. / Algoritmos criptográficos para redes de sensores.
The need for security is a great concern in any modern network. However, networks that are highly dependent of constrained devices (such as sensors, tokens and smart cards) impose a difficult challenge: their reduced availability of memory, processing power and (more importantly) energy hinders the deployment of many important cryptographic algorithms known
Publicado em: 2008
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32. Agregação e predição de dados no processamento de consultas em redes de sensores sem fio
Muitas pesquisas em redes de sensores sem fio (RSSF) têm sido desenvolvidas nos últimos anos, com foco na economia de energia dos nós sensores. Para alcançar este objetivo, tais pesquisas utilizam como estratégia a redução de dados enviados na rede. Neste trabalho, é proposta uma estratégia eficiente de agregação e predição de dados em RSSF, com
Publicado em: 2008
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33. A methodology for development augmented reality applications using mobile phones and sensors devices. / Uma metodologia para o desenvolvimento de aplicações de realidade aumentada em telefones celulares utilizando dispositivos sensores.
Handheld Augmented Reality or Handheld AR is the implementation of Augmented Reality (AR) systems into handheld devices. Handheld AR applications use the handheld devices camera to recognize markers (inserted into the environment). This process enables data entry into AR system. The response generated for these applications are presented as virtual images (3
Publicado em: 2008
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34. Desenvolvimento de sistema de monitoramento de produção avicola utilizando rede de sensores sem fio / Development of monitoring system of poultry production using wireless sensor network
It is increasingly necessary to optimize the agricultural production due to environmental or economic pressures imposed by global markets. Aiming at increasing the efficiency of agricultural production come the need to exert greater control in the procedures adopted, especially in poultry barns. The development of control and monitoring systems based on Wire
Publicado em: 2008
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35. Otimização do tempo de vida em redes de sensores sem fio utilizando algoritmo de energia e protocolo difusão direcionada / Optimization of lifetime in nets algorithm using wireless sensors, energy and targeted dissemination protocol
O notável desenvolvimento da indústria eletrônica observado nos últimos tempos tem permitido aplicações de conjuntos integrados de sensores em ambientes sem fio, conhecidos por wireless sensor networks (WSN), que passam por sensoriamento de processos industriais, ambientes tóxicos, projetos militares de monitoração de variáveis de segurança, até
Publicado em: 2008
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36. Uso de small worlds no roteamento em redes de sensores sem fio / Use of small worlds in wireless sensor networks routing
In this work, has made an study about the use and influences of the small world effect, or six degrees of separation, in routing of wireless sensors network (WSNs). For this objective, was analyzed the characteristics of WSNs that influence in the routing and the different types of protocols. Moreover, was studied the characteristics of small world effect an
Publicado em: 2007