152 documents found, page 1 of 16
Fractal Patch Antenna based on Photonic Crystal for Enhanced Millimeter-Wave Co...
Bagheri, Nila; Peha, Jon; Velez, Fernando J.This paper introduces a Fractal Patch Antenna (FPA) integrated with Photonic Crystals (PhC) designed for Intelligent Transportation Systems (ITS) in the Millimeter-wave bands (mmWaves) given the importance of the application of mmWaves in Vehicle-to-Everything (V2X) networks, we assumed, as examples, that the antenna is designed to resonate at three frequency bands: 31.42 GHz, 37.76 GHz, and 38.92 GHz. With a g...
Smart textiles for health monitoring in industrial environments: a framework fo...
Vilarinho, Bruna Abreu; Vieira, Andre; Nunes-Pereira, João; Parente, João; Pires, Ivan Miguel Serrano; Velez, Fernando J.The occupational health and safety of workers in industrial plants are increasingly compromised through exposure to thermal, physical, and psychological stressors. Wearable sensors embedded in garments have been introduced as a promising technology for real-time, continuous health monitoring without compromising workers' mobility or comfort. This paper reviews recent literature on wearable sensor technologies e...
Wearable sensors for stress monitoring in meniscus injury rehabilitation
Pires, Catarina de Sá Baio; Velez, Fernando J.; Coelho, Paulo Jorge Simões; Pataca, António Oseas; Pires, Ivan Miguel SerranoMonitoring vital signs is essential in identifying physiological stress, particularly in rehabilitating meniscus injuries. Stress can compromise the effectiveness of physiotherapy, affecting recovery. This paper reviews monitoring technologies, such as those that consider heart rate and sweating sensors, and their application in remote patient monitoring. It highlights the importance of collecting real-time dat...
Driving Healthcare Monitoring with IoT and Wearable Devices: A Systematic Review
João Pedro da Silva Baiense; Zdravevski, Eftim; Coelho, Paulo Jorge Simões; Serrano Pires, Ivan Miguel; Velez, Fernando J.Wearable technologies have become a significant part of the healthcare industry, collecting personal health data and extracting valuable information for real-time assistance. This review article analyzes 35 scientific publications on driving healthcare monitoring with IoT and wearable device applications. These articles were considered in a quantitative and qualitative analysis using the Natural Language Proces...
Radio Coverage Assessment and Indoor Communication Enhancement in Hospitals: A ...
da Silva, Óscar; Teixeira, Emanuel; Corceiro, Ana; Reis, António; Velez, Fernando J.The adoption of wireless medical technologies in hospital environments is often limited by cellular coverage issues, especially in indoor areas with complex structures. This study presents a detailed radio spectrum measurement campaign conducted at the Cova da Beira University Hospital Center (CHUCB), using the NARDA SRM-3006 and R&S®TSME6 equipment. The signal strength and quality of 5G NR, LTE, UMTS, and NB-I...
Traffic Scheduling and Resource Allocation for Heterogeneous Services in 5G New...
Pindi, Ntunitangua René; Velez, Fernando J.The rapid evolution of 5G New Radio networks has introduced a wide range of services with diverse requirements, complicating their coexistence within the shared radio spectrum and posing challenges in traffic scheduling and resource allocation. This study aims to analyze and categorize the methods, approaches, and techniques proposed to ensure efficient joint and dynamic packet scheduling and resource allocatio...
Circuito de Compensação de Junção Fria para Termopar
Brito, Fábio; Barata, Rui; Velez, Fernando J.; Reis, António D.Este documento tem como objetivo testar a efetividade prática de um circuito de condicionamento de sinal de um sensor de temperatura, nomeadamente um termopar. Antes de adquirir o sinal de um sensor para digitalização, um dos requisitos no condicionamento de sinal, consiste na implementação de um circuito de compensação de junção fria, para a obtenção mais precisa do valor de tensão obtido. O termopar permite m...
Q-Learning-Driven Enhancement of Slotted ALOHA in IEEE 802.15.4 WSNs
Baptista, Amilton; Velez, Fernando J.Given the proliferation of connected devices and the prioritization of real-time data acquisition across various scenarios, enhancing the energy efficiency within Wireless Sensor Networks (WSNs) is of paramount importance. This work has focused on the IEEE 802.15.4 standard and addresses existing medium access control protocols such as CSMA or Slotted ALOHA and proposes refinements in the Slotted ALOHA protocol...
Multi-Band Resonant Photonic Crystal Antenna for 5G Applications
Teixeira, Emanuel; Teixeira, Emanuel; Peha, Jon; Velez, Fernando J.Extended reality (XR) is bridging the gap between virtual and real-world interactions enabling users to interact in realistic virtual worlds, removing physical obstacles, and establishing shared areas that promote greater comprehension and teamwork. The growing demand for high-frequency 5G communication systems supporting these new applications motivates the need of compact and efficient antennas capable of ope...
Wearable solution for health monitoring of car drivers
Baiense, João Pedro; Coelho, Paulo Jorge; Pires, Ivan Miguel; Velez, Fernando J.The need for creative solutions in real-time health monitoring has been highlighted by the rise in health-related incidents involving drivers of motor vehicles. It has led to the development of wearable technology that seamlessly integrates with the Internet of Medical Things (IoMT) to improve driver safety and healthcare responsiveness. The development of a revolutionary wearable technology system is presented...