Encontrados 7 documentos, a visualizar página 1 de 1
Automatic sleep staging: a computer assisted approach for optimal combination o...
Khalighi, Sirvan; Sousa, Teresa; Pires, Gabriel; Nunes, UrbanoTo improve applicability of automatic sleep staging an efficient subject-independent method is proposed with application in sleep–wake detection and in multiclass sleep staging (awake, non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep). In turn, NREM is further divided into three stages denoted here by N1, N2, and N3. To assess the method, polysomnographic (PSG) records of 40 patients from ...
Applications of information theory, genetic algorithms, and neural models to pr...
Ludwig Jr., Oswaldo; Nunes, Urbano; Araújo, Rui; Schnitman, Leizer; Lepikson, Herman Augustohttp://www.sciencedirect.com/science/article/B6X3D-4V74VD0-3/2/745c06c619be3b3dfdb1eaa36b57cbbe
A New Approach for Operating Powered Wheelchairs by People with Severe Impairments
Urbano, Maria Margarida; Fonseca, José; Nunes, Urbano; Lopes, ArmindaThis paper discusses the introduction of mechanisms to adapt commercial powered wheelchairs in order to facilitate its driving by people with severe impairments. Several models of operation are proposed and the most promising, at the moment, called legacy adapted mode, is detailed. A part of the formal operation model is presented. The model is then used in the STAGE simulator, not only for its valuation, but a...
A Fast Firing Binaural System for Ultrasonic Pattern Recognition
Moita, Fernando; Lopes, Ana; Nunes, UrbanoAbstract A binaural sonar configuration with capability to detect and identify walls, edges and corners on real-time is presented in this work. A new multi-echo ultra-fast firing method increases the sonar acquisition rate, and provides crossed measurements without interference. A feature map is built on-line using Bayesian updating and classification rules. Three classifiers are implemented and analyzed: mini...
Data fusion and path-following controllers comparison for autonomous vehicles
Nunes, Urbano; Bento, L.Abstract This paper presents a comparative study of two path-following controllers developed for guiding autonomous vehicles in semi-structured outdoor environments. Part of this paper is focused on the performance of two path-following controllers, which are implemented using two different approaches, the first using fuzzy logic and the second using chained systems theory. The control effort and the errors ma...
Particle swarm-based olfactory guided search
Marques, Lino; Nunes, Urbano; Almeida, A. deAbstract This article presents a new algorithm for searching odour sources across large search spaces with groups of mobile robots. The proposed algorithm is inspired in the particle swarm optimization (PSO) method. In this method, the search space is sampled by dynamic particles that use their knowledge about the previous sampled space and share this knowledge with other neighbour searching particles allowing...
Olfaction-based mobile robot navigation
Marques, Lino; Nunes, Urbano; Almeida, Aníbal T. deIt is well known that insects and other animals use olfactory senses in a wide variety of behavioural processes, namely to recognize and locate food sources, detect predators, and find mates. This article discusses the gathering of olfactive information and its utilization by a mobile robot to find a specific odour source in a room with turbulent phenomena's and multiple sources of odour. Three navigation algor...
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