40 documents found, page 1 of 4
Intelligent PPG-based Heart Rate Signal Analysis for Car Drivers Monitoring
Baiense, João Pedro; Eerdekens, Anniek; Schampheleer, Jorn; Deruyck, Margot; Pires, Ivan Miguel; Velez, Fernando JoséThis research aims to contribute to enhancing road safety through the development and exploration of an intelligent wristbandbased health monitoring solution for car drivers. It focuses on using various sensors, such as the photoplethysmogram (PPG) and an accelerometer, to accurately estimate the drivers’ heart rate. The primary goal was to create a robust and accurate model capable of real-time heart rate esti...
Internet of Things Applied to the Intelligent Management of Parking Parks in th...
Paiva, João Pedro Raposo; Barata, Rui Eugénio Da Silva; Velez, Fernando José; Flanigan, Katherine; Reis, AntonioThis paper presents a study on how the Internet of Things (IoT) can be applied to the intelligent management of parking lots in the historic area of Covilhã. The aim is to study the parking areas and car parks, the challenges faced when trying to find a parking space and, finally, to apply technologies, such as IoT, to mitigate and solve some of the existing problems. This study can be extrapolated to other mou...
Monitorização da Disponibilização de Cobertura Celular Ubíqua em Ambiente Hospi...
Silva, Óscar; Teixeira, Emanuel; Corceiro, Ana; Reis, António; Velez, Fernando JoséNos últimos anos, as comunicações moveis celulares e sem fios têm evoluído de forma significativa, possibilitando o surgimento de várias tecnologias que transformaram a forma como nos comunicamos. No contexto da saúde, as Redes Sem Fios de Área Corporal (WBAN) possibilitam a monitorização remota de pacientes, recolhendo e transmitindo dados vitais através de dispositivos localizados ao redor ou dentro do corpo ...
Internet das coisas e eficiência energética em agricultura de precisão
Pungo, Érica; Teixeira, Emanuel; Reis, António; Velez, Fernando JoséEste trabalho apresenta aspetos de Redes de Sensores sem Fios aplicadas à promoção da agicultura de precisão, inteligente e autónoma. O sistema de irrigação aqui desenvolvido com base em conceitos da Internet das Coisas (IoT) destina-se a combater os desperdícios, que ocorrem num modelo de rega tradicional e aprimorar a eficiência energética nas comunicações. Para desenvolver este sistema de irrigação foi utili...
Radio‐frequency energy harvesting for wearable sensors
Borges, Luís M.; Chávez‐Santiago, Raul; Barroca, Norberto; Velez, Fernando José; Balasingham, IlangkoThe use of wearable biomedical sensors for the continuous monitoring of physiological signals will facilitate the involvement of the patients in the prevention and management of chronic diseases. The fabrication of small biomedical sensors transmitting physiological data wirelessly is possible as a result of the tremendous advances in ultra-low power electronics and radio communications. However, the widespread...
Hybrid WiMAX and Wi-Fi networks for the support of b-Learning and Telemedicine
Costa, Rui; Velez, Fernando José; Robalo, Daniel Luís Silveira; Marques, Marco; Comissário, Cláudio; Riscado, José; Cavaleiro, Victor; Sebastião, Pedrohis paper addresses the deployment of hybrid WiMAX and Wi-Fi networks for the support of always best connected telemedicine and health sciences education applications. The available services include a LMS (Learning Management System) and several structured functionalities for b-Learning. For the support of these services, fixed and wireless LANs have been deployed, as well as an experimental point-to-multipoint...
Taxonomy for Wireless Sensor Networks Services Characterisation and Classification
Borges, Luís M.; Velez, Fernando José; Lebres, António S.Nowadays, the users of Wireless Sensor and Actuator Networks (WSAN) are becoming more and more demanding in terms of choice and diversity of applications, and the identification of their characterization parameters is thus in order. This paper describes the WSAN characterization parameters and is an update of a previous work, but new parameters were added and new characteristics were proposed. The gathering of ...
Optimization of Multi-Service IEEE 802.11e Block Acknowledgement
Cabral, Orlando; Velez, Fernando José; Mihovska, Albena Dimitrova; Prasad, NeeliOptimization of IEEE 802.11e MAC protocol performance is addressed by modifying several parameters left open in the standard, like block size and acknowledgement policies in order to improve the channel efficiency. The use of small block sizes leads to a high overhead caused by the negotiation on the other hand, the use of large block sizes causes long delays, which can affect negatively real-time applications ...
Cross-layer multi-hop simulator for ad-hoc IEEE 802.11e
Ferro, João Miguel; Velez, Fernando JoséThe purpose of this paper is to present a custom-made cross-layer network simulator for wireless IEEE 802.11e in a multihop environment. A previous work of our research team created a simulator just for the physical plus MAC layers, which in this work was adapted to model the transmission of a packet from a source to a destination using intermediate nodes. Some initial tests were performed using a simple routin...
Implementation of IEEE 802.11e Block Acknowledgement Policies
Cabral, Orlando; Segarra, Alberto; Velez, Fernando JoséOptimisation of IEEE 802.11e MAC protocol performance can be performed by modifying several parameters left open in the standard, like buffer size and acknowledgement policies. In this work, an event driven simulator was developed, and a comparison of the results between the case of standalone services and several services supported simultaneously was addressed. With only a single service, higher values for the...