Browsing by Issue Date, starting with "2020-12-18"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- A Realidade Aumentada como ferramenta pedagógica: o futuro da EV SMART BOOKPublication . Silvestre, Bárbara Alexandra Ferreira; Araújo, SusanaEsta dissertação aborda a tecnologia de Realidade Aumentada no setor educacional. Pretende contribuir para uma melhor perceção das potencialidades desta tecnologia perante aplicações móveis utilizadas como ferramentas pedagógicas. Para esse efeito, optou-se por analisar as características da Realidade Aumentada e a aplicação EV SMART BOOK, do Grupo Porto Editora, com o intuito de entender se esta tecnologia pode proporcionar uma melhoria útil e funcional à EV SMART BOOK. Esta investigação foi desenvolvida segundo uma abordagem metodológica qualitativa, recorrendo a entrevistas semiestruturadas a professores do 3º ciclo e a questionários aos alunos dos professores entrevistados. Este estudo contribui para a motivação da integração dos dispositivos móveis no contexto de sala de aula e na adoção de práticas educativas lúdicas. Os resultados sugerem que, a Realidade Aumentada possui as características que os professores procuram numa aplicação como a EV SMART BOOK.
- Library and applications for DSP and SDR researchPublication . Pinho, David Boggon; Lourenço, André; Nascimento, JoséThe increasing number of connected devices and wireless protocols poses several challenges and is calling for new ways to design and implement radio systems. Technological advances in analogue-to/from-digital converters and computing power has made software-defined radio (SDR) a popular architecture. I propose an initial implementation of a library for SDR research, targeted at fellow students and digital signal processing (DSP)/SDR practitioners. The SKSDR library is developed in Python due to its well established usage in the scientific community and large body of supporting libraries and documentation. The library includes an initial implementation of several algorithms for various stages of the transmitter and receiver chains, such as modulators, matched filtering, synchronization blocks, among others. On top of the library, and as demonstration purposes, I propose two applications based on the GNU Radio SDR framework. The first application is a wideband frequency modulation (WBFM) receiver, based on an alternative algorithm, than the one already existing in the GNU Radio system. The second application is a complete PSK transceiver that works both in simulated environment and with physical hardware, real-time requirements. This is aimed at demonstrating the challenges posed by physical implementation, like real channel impairments, which sometimes are difficult to capture in simulation environment. GNU Radio will be used mostly as wrapping logic, with the main goal being full re-use of the algorithms developed for the SKSDR library. A HackRF One and RTL-SDR devices will be used as the radio front ends, for transmitter and receiver respectively.
- Radiative seesaw corrections and charged-lepton decays in a model with soft flavour violationPublication . Aeikens, E. H.; Ferreira, Pedro Miguel; Grimus, W.; Jurciukonis, D.; Lavoura, L.We consider the one-loop radiative corrections to the light-neutrino mass matrix and their consequences for the predicted branching ratios of the five lepton-flavour-violating decays l1--> l2-l3+l3- in a two-Higgs-doublet model furnished with the type-I seesaw mechanism and soft lepton-flavour violation. We find that the radiative corrections are very significant; they may alter the predicted branching ratios by several orders of magnitude and, in particular, they may help explain why BR (mu (-) -> e(-)e(+)e(-)) is strongly suppressed relative to the branching ratios of the decays of the tau (-). We conclude that, in any serious numerical assessment of the predictions of this model, it is absolutely necessary to take into account the one-loop radiative corrections to the light-neutrino mass matrix.