Encontrados 160 documentos, a visualizar página 1 de 16
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...
Photonic sensors based on flexible materials with FBGs for use on biomedical ap...
Silva, A. F.; Rocha, R. P.; Carmo, J. P.; Correia, J. H.This chapter is intended for presenting biomedical applications of FBGs embedded into flexible carriers for enhancing the sensitivity and to provide interference-free instrumentation.
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...
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...
Microlenses for stereoscopic image formation
Rocha, R. P.; Carmo, J. P.; Correia, J. H.This paper presents microlenses for integration on a stereoscopic image sensor in CMOS technology for use in biomedical devices. It is intended to provide an image sensor with a stereoscopic vision. An array of microlenses potentiates stereoscopic vision and maximizes the color fidelity. An array of optical filters tuned at the primary colors will enable a multicolor usage. The material selected for fabricating...
Polichromatic image sensor with microlenses for stereoscopic acquisition
Rocha, R. P.; Carmo, J. P.; Correia, J. H.; Silva, M. F.This paper presents the fabrication of microlenses for integration on a stereoscopic image sensor in CMOS technology and a low-cost technology for fabricating optical filters arrays tuned for the primary colors. The material selected for fabricating the microlens was the AZ4562 positive photoresist and the fabrication process explained. Moreover, the fabrication process presented in this paper is for directly p...
Fabrication methodology of microlenses for stereoscopic imagers using standard ...
Rocha, R. P.; Carmo, J. P.; Correia, J. H.This paper presents the fabrication technology of microlenses maintaining a high reproducibility of their characteristics with low cost. The objective of microlenses is to be integrated into imagers in CMOS technology to allow stereoscopic vision. The fabricated microlenses form cylindrical arrays to be placed above the optical filters and photodetectors, in order to potentiate stereoscopic vision and at the sa...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||