Pedro Henrique Gomes

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The use of pesticides in agriculture is essential to maintain the quality of large-scale production. The spraying of these products by using aircraft speeds up the process and prevents compacting of the soil. However, adverse weather conditions (e.g. The speed and direction of the wind) can impair the effectiveness of the spraying of pesticides in a target(More)
In this paper, we introduce a novel queue management technique for the buffer space at the base station of infrastructure 802.11 networks that considers mobile user’s receiving characteristics. The maximum amount of the base station buffer that can be used by a given flow is updated proportionally to RTT, measured at the mobile nodes and sent to the base(More)
We present the design and implementation of MultiChannel Collection (MCC) protocol , a high-rate multi-channel time-scheduled protocol for fair, real-time data collection in Wireless Sensor Networks (WSN). MCC incorporates sophisticated mechanisms for balanced routing tree formation, multiple frequency channel allocation and globally synchronized TDMA(More)
Smart homes provide automatic services through a combination of wireless sensor networks (WSNs) and wireless devices that allow monitoring operations in the home. These smart homes have been increasingly studied not only by the academic community but also by industry on account of the great potential they have, especially in applications that can help(More)
This paper proposes an architecture for mobile wireless networks based on Radio-over-Fiber (RoF) technology. The architecture organizes cells in a multi-tier fashion, with different tiers covering areas with different radii lengths. Proposed optimization algorithm splits cells to improve network capacity in congested areas and merges cells when the demand(More)
Currently, there is an increasing number of patients that are treated in-home, mainly in countries such as Japan, USA and Europe. As well as this, the number of elderly people has increased significantly in the last fifteen years and these people are often treated in-home and at times enter into a critical situation that may require help (e.g when facing an(More)
In this paper, we introduce a radio resource optimization model for Radio-over-Fiber (RoF) access networks. We propose an integer programming model to minimize the network cost while providing service to all mobile users. The proposed architecture arranges cells in a multi-layer fashion, with cells in each layer providing different coverage radius. The(More)
We consider the problem of dynamic multichannel access in a Wireless Sensor Network (WSN) containing N correlated channels, where the states of these channels follow a joint Markov model. A user at each time slot selects a channel to transmit a packet and receives a reward based on the success or failure of the transmission, which is dictated by the state(More)
This paper presents a novel queue management mechanism for base stations in infrastructure IEEE 802.11 networks. The mechanism is transparent to high-level protocols and is compatible with the standard. Its effectiveness is illustrated by showing that it can ameliorate the RTT unfairness and the MAC anomaly problems in wired-cum-wireless networks.