6 documents found, page 1 of 1
Conhecer e melhorar o solo para a sustentabilidade dos sistemas hortoindustriai...
Nunes, A. P.; Barradas, A.; Pereira, J.P.; Matos, Maria Susete; Almeida, M.L.; Diogo, E.; Amaral, A.O projeto MaisSolo tem como objetivos centrais melhorar a proteção das culturas e a eficiência do uso dos recursos na produção agrícola através do desenvolvimento e aplicação de tecnologias alternativas à luta química contra pragas e doenças.
Design of network coding based reliable sensor networks
Al-hawri, Eman; Correia, Noélia; Barradas, A.Network coding can be very useful in achieving a balance between energy efficiency and end-to-end packet error in sensor networks, particularly if only a subset of the nodes act as encoding nodes. In this article, a mathematical model and a heuristic algorithm are proposed to plan for the best placement of encoding nodes while ensuring reliability. These approaches are also able to address scenarios where senso...
GACN: Self-clustering genetic algorithm for constrained networks
A. Martins, J.; Mazayev, Andriy; Correia, Noélia; Schutz, G.; Barradas, A.Extending the lifespan of a wireless sensor network is a complex problem that involves several factors, ranging from device hardware capacity (batteries, processing capabilities, and radio efficiency) to the chosen software stack, which is often unaccounted for by the previous approaches. This letter proposes a genetic algorithm-based clustering optimization method for constrained networks that significantly im...
Resource design in constrained networks for network lifetime increase
Correia, Noélia; Mazayev, Andriy; Schutz, G.; A. Martins, J.; Barradas, A.As constrained "things" become increasingly integrated with the Internet and accessible for interactive communication, energy efficient ways to collect, aggregate, and share data over such constrained networks are needed. In this paper, we propose the use of constrained RESTful environments interfaces to build resource collections having a network lifetime increase in mind. More specifically, based on existing ...
An energy-aware resource design model for constrained networks
Correia, N.; Schütz, Gabriela; Mazayev, A.; Martins, J.; Barradas, A.The Internet of Things is expected to incorporate objects and sensor networks of all kinds, and in particular, constrained sensor networks where energy consumption is a critical issue. In order to increase the lifetime of such networks, intelligent and standard-based solutions should be used. Here, we address this challenge through the use of CoRE interfaces for the resource design. These interfaces allow the s...
Planning the reassignment of frequencies in fiber-wireless access networks
Correia, N.; Sabino, S.; Schutz, G.; Barradas, A.FiWi architectures have been proposed as efficient solutions to provide high bandwidth and ubiquity at access network areas. In multi-radio and multi-channel FiWi scenarios an effective frequency assignment should be done to radios so that higher throughput and low delay can be obtained and the best of such architectures is achieved. However, traffic conditions change over time meaning that radio channel reconf...