A5033138200- Advanced Power Amplifier Design
- Indoor and Outdoor Localization Technologies
- Robotics and Sensor-Based Localization
- Energy Efficient Wireless Sensor Networks
- Retinal Imaging and Analysis
- Radio Frequency Integrated Circuit Design
- PAPR reduction in OFDM
- Speech and Audio Processing
- Advancements in PLL and VCO Technologies
- RFID technology advancements
- Music and Audio Processing
- Retinal and Macular Surgery
- Medical Image Segmentation Techniques
- Retinal Diseases and Treatments
- Cell Image Analysis Techniques
- Context-Aware Activity Recognition Systems
- Digital Imaging for Blood Diseases
- Phonocardiography and Auscultation Techniques
- Retinal and Optic Conditions
- Analog and Mixed-Signal Circuit Design
- Glaucoma and retinal disorders
Stadtspital Waid
2025
University of Aveiro
2006-2024
Instituto de Telecomunicações
2006-2018
University of Beira Interior
2018
The advent of foundation models (FMs) is transforming medical domain. In ophthalmology, RETFound, a retina-specific FM pre-trained sequentially on 1.4 million natural images and 1.6 retinal images, has demonstrated high adaptability across clinical applications. Conversely, DINOv2, general-purpose vision 142 shown promise in non-medical domains. However, its applicability to tasks remains underexplored. To address this, we conducted head-to-head evaluations by fine-tuning RETFound three...
(1) Background: The process of epiretinal membrane peeling (MP) requires precise intraoperative visualization to achieve optimal surgical outcomes. This study investigates the integration preoperative Optical Coherence Tomography (OCT) images into real-time video feeds, providing a dynamic overlay that enhances decision-making during surgery. (2) Methods: Five MP surgeries were analyzed, where OCT first manually aligned with initial frame by selecting five pairs corresponding points. A...
This article presents a measurement strategy and characterization bench for the evaluation of Signal to Noise Distortion Ratio (SNDR) in nonlinear wireless systems when presence memory effects. proposal will be combined with closed analysis mechanisms appearing communication presenting memory. The this mechanism, system is excited by complex modulated signals different statistics, useful tool design engineers evaluate degradation SNDR systems. Finally, proposed approach applied CDMA system,...
This paper studies the impact of power amplifiers, PA, long term memory effects in QPSK modulated signals. To quantify an expansion nonlinear distortion behavior PA is obtained. Both co-channel and adjacent are calculated. It then showed that channel significantly affected by effects, which implies a rise EVM figures. The theoretical results further compared with CAD/CAE simulations measurements.
Integrating deep learning into medical imaging is poised to greatly advance diagnostic methods but it faces challenges with generalizability. Foundation models, based on self-supervised learning, address these issues and improve data efficiency. Natural domain foundation models show promise for imaging, systematic research evaluating adaptation, especially using parameter-efficient fine-tuning, remains underexplored. Additionally, little addresses the issue of catastrophic forgetting during...
This work describes an open-source indoor location emulator, based on a modular approach, with loosely coupled components, fitting multiple simultaneous technologies, focus in the evaluation and training of Machine Learning methods. The was implemented top MQTT protocol, leading to decoupled architecture that can easily be extended for several purposes, including integration real virtual devices. emulator supports active passive radio scenarios, Wi-Fi UHF RFID tags. is intended underlying...
This paper presents a first view on the time trajectories of multi-sine signals. These play an important role in wireless system characterization, since they allow us to obtain figures merit for pre-programmed multi-sines, optimizing their use laboratory. The that could be measured span from analysis constellation diagrams error vector magnitude, EVM