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Percorrer por autor "Fernandes, Marco"

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  • Design of a TRNG in 600-nm IGZO-TFT FlexlCs for secure IoT applications
    Publication . Cabacinho, João; Sousa, Diogo; Marcelino, João; Fernandes, Marco; Barquinha, Pedro; Goes, João; Casaleiro, João; Casaleiro, João; Oliveira, Luís Bica
    Abstract As the demand for secure Internet of Things (IoT) devices increases, the need for hardware security solutions has become more critical, particularly in applications with strict power and area constraints. Thin-film transistors (TFTs) are an emerging technology, that enables the integration of complex circuits onto thin, flexible substrates offering both low-cost manufacturing and compatibility with large-area system implementations. This paper, presents, to the best of the authors' knowledge, the first true random number generator (TRNG) based on jittered oscillator sampling, implemented in 600 nm Indium-Gallium-Zinc-Oxide (IGZO) TFT flexible integrated circuits (FlexICs) technology. The proposed TRNG achieves a throughput of 1.33 Mbits/s, an energy consumption of 4.68 nJ/bit, and occupies an area of 0.920 mm(2). The TRNG showed promising results by passing 8 NIST (National Institute of Standards and Technology) randomness tests under nominal conditions. This opens new opportunities for embedding security primitives in flexible electronics, allowing for integration of hardware security in wearable electronics, biomedical devices, communication tags and other applications.
    2025Comunicação em conferência Acesso aberto Ver mais
  • Radiopharmaceuticals for myocardial perfusion imaging: SPECT & PET
    Publication . Adães, Rui; Fernandes, Marco; Pereira, Edgar; Sousa, Eva
    Myocardial perfusion imaging (MPI) is used on a daily basis to access coronary blood flow in patients that are suspected or have known Coronary Artery Disease (CAD). A Single Photon Emission Computed Tomography (SPECT) or and Positron Emission Tomography (PET) scan are used to access regional blood flow quantification either at rest or stress, the imaging acquisition is connected to an Electrocardiogram (ECG) and it is able to determine and quantify other myocardial parameters like myocardial wall thickness and wall motion. PET is not used so broadly due to its high procedure cost, the proximity with cyclotron, where are produced the majority of radiopharmaceuticals used in PET, due to their shor thalf-life. This work is intended to carry out a review of the tests relating to radiopharmaceuticals that are used in clinical practice in SPECT or PET for assessment of myocardial perfusion, also focusing very promising radiopharmaceuticals that are under investigation or in clinical trials with great potential for conventional nuclear medicine or PET, proceeding to a comparative analysis of both techniques and respective radiopharmaceuticals used.
    2015-10Documento de conferência Acesso aberto Ver mais