Encontrados 7 documentos, a visualizar página 1 de 1
Experimental performance comparison of indoor positioning algorithms based on r...
Silva, Hélder D.; Afonso, José A.; Rocha, Luís A.Publicado em "Proceedings of the World Congress on Engineering 2014, vol. 1. ISBN 978-988-19252-7-5" ; The work presented here compares the performance of indoor positioning systems suitable for low power wireless sensor networks. Map matching, approximate positioning (weighted centroid) and exact positioning algorithms (least squares) were tested and compared in a small predefined indoor environment. We found...
A telerehabilitation system based on wireless motion capture sensors
Macedo, Pedro; Afonso, José A.; Rocha, Luís A.; Simões, RicardoThe constant growth of the elderly population in the world creates new challenges and opportunities in health care systems. New technological solutions have to be found in order to meet the needs and demands of our aging society. The welfare and quality of life of the elderly population must be a priority. Continuous physical activity will play an important role, due to the increase of the retirement age. Howev...
Conceptualizing a credits trading approach towards corporate social responsibil...
Hede, Shantesh; Ferreira, Paula Varandas; Nunes, Manuel L.; Rocha, Luís A.Life Cycles of both products and services significantly consume renewable and non-renewable resources across a worldwide scale. Thus, eliciting an enormous environmental impact, that is known to disproportionately instigate crises into the socio-economic and political domains of our civilization. Therefore, Creation of Shared Value and Corporate Social Responsibility (CSR) have been considered by Policy makers,...
Reciprocal dry sliding wear behaviour of B4Cp reinforced aluminium alloy matrix...
Toptan, Fatih; Kerti, Isil; Rocha, Luís A.Manuscript Draft ; In the present work, AlSi9Cu3Mg alloy matrix composites reinforced with 15 and 19% (vol.) B4Cp were produced by squeeze casting route at 850 °C under low vacuum. Titanium-containing flux (K2TiF6) was used to promote the wetting between B4C and liquid aluminium metal. It was found, from the microstructural observations, that the wetting improved by the formation of a thin Ti-rich reaction lay...
IT-REHAB : Integral Telerehabilitation System
Fernández-López, Helena; González-Jiménez, Daniel; González-Castaño, Francisco J.; Rocha, Luís A.; Afonso, José A.The main functionalities of the physical rehabilitation module of IT-REHAB are briefly described in this paper. IT-REHAB is a telerehabilitation system under development for patients with physical or cognitive rehabilitation needs. It supports wireless biomechanical and physiological data collection and includes advanced functionalities based on a custom-designed Medium Access (MAC) protocol for improved bandwi...
An enhanced reservation-based MAC Protocol for IEEE 802.15.4 networks
Afonso, José A.; Silva, Hélder D.; Macedo, Pedro; Rocha, Luís A.The IEEE 802.15.4 Medium Access Control (MAC) protocol is an enabling standard for wireless sensor networks. In order to support applications requiring dedicated bandwidth or bounded delay, it provides a reservation-based scheme named Guaranteed Time Slot (GTS). However, the GTS scheme presents some drawbacks, such as inefficient bandwidth utilization and support to a maximum of only seven devices. This paper p...
Design and implementation of a wireless sensor network applied to motion capture
Afonso, José A.; Silva, Hélder D.; Macedo, Pedro; Rocha, Luís A.This paper describes the development of a wireless sensor network prototype and its application in a motion capture system based on inertial and magnetic sensors. The system presents a portable and modular architecture and allows the monitoring of several users at the same time using a single wireless network. The target application requires the wireless sensor network to operate efficiently under high loads, s...
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