114 documents found, page 1 of 12
FAIR-FATE: Fair Federated Learning with Momentum
Salazar, Teresa; Fernandes, Miguel; Araújo, Helder; Abreu, Pedro HenriquesWhile fairness-aware machine learning algorithms have been receiving increasing attention, the focus has been on centralized machine learning, leaving decentralized methods underexplored. Federated Learning is a decentralized form of machine learning where clients train local models with a server aggregating them to obtain a shared global model. Data heterogeneity amongst clients is a common characteristic of F...
Inequality and growth in Portugal: a reappraisal for the period 1986-2017
Fernandes, Miguel; Andrade, João Sousa; Duarte, Adelaide; Simões, MartaThis paper investigates the inequality-growth nexus for Portugal over the period 1986-2017. Portugal is a country that has recorded a decelerating growth trajectory together with high levels of inequality, coupled with relatively low levels of human capital and productivity. We compute different measures of earnings inequality using microdata from the Quadros de Pessoal database and use them to estimate VAR and...
Multichannel detector system for surface plasmon resonance biosensors
Fernandes, Miguel; Fantoni, Alessandro; Soares, Paulo; Lourenço, Paulo; Vieira, ManuelaPhotonic systems are gaining an important role in the field of medical diagnosis due to the achievable high sensitivity and selectivity and low cost, enabling the fabrication of disposable point of care diagnosis systems for multiple pathologies. In this work we present the detector subsystem developed for a multi-channel surface plasmon resonance (SPR) based sensor. The core of the system is a multimode interf...
Metamaterials in waveguide to fiber couplers
Lourenço, Paulo; Fantoni, Alessandro; Costa, João; Fernandes, Miguel; Vieira, ManuelaCoupling light into or out of a photonic integrated circuit is often accomplished by establishing a vertical link between a single mode optical fibre and a resonant waveguide grating, which is then followed by a tapered and a single mode waveguides. For a chip to fibre coupler, the period of the diffraction grating is often apodized to achieve an optimal beam profile at the input of the optical fibre. The taper...
Subwavelength structures for taper waveguides
Lourenço, Paulo; Fantoni, Alessandro; Costa, João; Fernandes, Miguel; Vieira, ManuelaIn Photonic Integrated Circuits (PICs) it is often necessary some sort of mismatch adaptation between waveguides of different cross-sections. There are several instances of such a designing constraint, being the vertical coupling between the PIC and an optical fibre probably the most representative of all examples. Here, the beam of electromagnetic energy inside the PIC must be inserted/extracted through/to an ...
10 anos do Centro de Estudos da Escola de Arquitetura da Universidade do Minho,...
Lopes, Ana; Delgado, André; Maia, Carlos; Burattini, Daniele; Silva, Filipe; Ferreira, Francisco; Silva, Hélder; Graça, Inês Lourenço[Excerto] O Lab2PT - Laboratório de Paisagens, Património e Território - apresenta-se como uma unidade de investigação com forte propensão para a investigação aplicada e prestação de serviços com elevado nível de impacto social. Atuando por entre várias áreas do saber, da arqueologia ao design ou às artes visuais, da geografia à história ou às ciências da terra, recebe da arquitetura e do urbanismo uma das suas...
Sistema de Arrefecimento Corporal no Uso de Fatos de Protecção NBQR
Fernandes, Miguel; Moita, Ana S.; Mendes, Miguel A. A.Os fatos de proteção usados em ambientes que contenham algum tipo de dispersão de produtos nucleares, biológicos, químicos e radiológicos (NBQR) apresentam um grau de isolamento elevado, que impossibilita a dissipação do calor corporal gerado pelo usuário. Este problema induz um estado de conforto muito baixo e aumenta a probabilidade de exaustão física daqueles que usam esta categoria de fatos. Existem várias ...
Translation and validation of the Portuguese version of the International Consu...
Pereira E Silva, Ricardo; Lopes, Filipe; Fernandes, Miguel; Polido, Joana; Ponte, Carolina; Esteves, André; Uren, Alan; dos Reis, José PalmaIntroduction and hypothesis: The International Consultation on Incontinence Questionnaire (ICIQ) Bladder Diary (BD) is a standardized and validated diary, developed in the English language, designed to assess lower urinary tract symptoms (LUTS) in men and women. This study reports the translation, cross-cultural adaptation and validation process of this diary to the Portuguese language. Methods: After translati...
Performance of an a-Si:H MMI multichannel beam splitter analyzed by computer si...
Costa, João; Almeida, Daniel; Fantoni, Alessandro; Lourenço, Paulo; Fernandes, Miguel; Vieira, ManuelaOptical power splitters are widely used in many applications and di_erent typologies have been developed for devices dedicated to this function. Among them, the multimode interference design is especially attractive for its simplicity and performance making it a strong candidate for low-cost applications, such as photonics lab-on-chips for biomedical point of care systems. Within this context, splitting the opt...
Design and optimization of a waveguide/fibre coupler in the visible range
Lourenço, Paulo; Fantoni, Alessandro; Costa, João; Fernandes, Miguel; Vieira, ManuelaWhen engineering photonic integrated structures, there will be a time that one must consider coupling out the electromagnetic field to an external device. Often, this coupling is made through a single mode optical fibre. Due to the mismatch in mode field diameters between waveguide and fibre modes, the propagating mode inside the dielectric waveguide must undertake a spot-size conversion. It requires to be radi...