Encontrados 16 documentos, a visualizar página 1 de 2
Remote patient monitoring based on ZigBee : lessons from a real-world deployment
Fernández-López, Helena; Afonso, José A.; Correia, J. H.; Simões, R.This work presents detailed experimental performance results, from tests executed in the hospital environment, for HM4All, a remote vital signs monitoring system based on a ZigBee body sensor network (BSN). Tests involved the use of six electrocardiogram (ECG) sensors operating in two different modes: the ECG mode involved the transmission of ECG waveform data and heart rate (HR) values to the ZigBee coordinato...
Towards the design of efficient nonbeacon-enabled ZigBee networks
Fernández-López, Helena; Afonso, José A.; Correia, J.H.; Simões, RicardoThis paper presents experimental results of the communication performance evaluation of a prototype ZigBee-based patient monitoring system commissioned in an in-patient floor of a Portuguese hospital (HPG – Hospital Privado de Guimar~aes). Besides, it revisits relevant problems that affect the performance of nonbeacon-enabled ZigBee networks. Initially, the presence of hidden-nodes and the impact of sensor node...
ZigBee-based Remote Patient Monitoring
Fernández-López, Helena; Afonso, José A.; Correia, J.; Simões, RicardoZigBee-based Remote Patient Monitoring
The need for standardized tests to evaluate the reliability of data transport i...
Fernández-López, Helena; Afonso, José A.; Correia, J.H.; Simões, RicardoWireless medical systems are comprised of four stages, namely the medical device, the data transport, the data collection and the data evaluation stages. Whereas the performance of the first stage is highly regulated, the others are not. This paper concentrates on the data transport stage and argues that it is necessary to establish standardized tests to be used by medical device manufacturers to provide compar...
Towards the design of efficient nonbeacon-enabled ZigBee networks
Fernández-López, Helena; Afonso, José A.; Correia, J. H.; Simões, RicardoThis paper presents experimental results of the communication performance evaluation of a prototype ZigBee-based patient monitoring system commissioned in an in-patient floor of a Portuguese hospital (HPG – Hospital Privado de Guimar~aes). Besides, it revisits relevant problems that affect the performance of nonbeacon-enabled ZigBee networks. Initially, the presence of hidden-nodes and the impact of sensor node...
ZigBee-based remote patient monitoring
Fernández-López, Helena; Afonso, José A.; Correia, J. H.; Simões, RicardoThis paper describes a developed continuous patient monitoring system based on the ZigBee protocol. The system was tested in the hospital environment using six sensor devices in two different modes. For electrocardiogram transmission and in the absence of hidden-nodes, the system achieved a mean delivery ratio of 100% and 98.56%, respectively for star and 2-hop tree network topologies. When sensor devices were ...
The need for standardized tests to evaluate the reliability of data transport i...
Fernández-López, Helena; Afonso, José A.; Correia, J. H.; Simões, RicardoWireless medical systems are comprised of four stages, namely the medical device, the data transport, the data collection and the data evaluation stages. Whereas the performance of the first stage is highly regulated, the others are not. This paper concentrates on the data transport stage and argues that it is necessary to establish standardized tests to be used by medical device manufacturers to provide compar...
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...
Sistema de sensorização móvel e controlo baseado em ZigBee para bicicletas elét...
Ferreira, Paulo Manuel Fernandes; Fernández-López, Helena; Afonso, José A.Este artigo apresenta um sistema de monitorização e controlo centrado em dispositivos móveis concebido para aplicação em cenários que permitem tirar partido de uma bicicleta eléctrica. A bicicleta, para além de um meio de transporte, é uma excelente ferramenta para a promoção do exercício físico, podendo contribuir para melhorar a aptidão física de utilizadores de diversas faixas etárias. O sistema proposto, ba...
Experimental evaluation of ZigBee and IEEE 802.15.4 for data-intensive body sen...
Gomes, Diogo; Afonso, José A.; Fernández-López, HelenaThis paper presents results concerning an experimental performance evaluation of ZigBee and IEEE 802.15.4 networks applied to the transport of data-intensive traffic generated by body sensor network applications. The experimental platform is based on the Z-Stack and TIMAC software stacks and the CC2530 device, from Texas Instruments. Three quality of service metrics are evaluated: goodput, delivery ratio and d...
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