81 documents found, page 1 of 9
A influência da neuromodulação não-invasiva, através das microcorrentes NESA, n...
Alves, Mário; Amaro, Tiago; Eira, Pedro; Moura, João; Silva, Rui; Abreu, Ana Raquel; Azevedo, Nelson; Neves Silva, J.P.Introdução: Patologias do nervo mediano associam-se a vários problemas, podendo causar até 28 dias de ausência laboral por ano. O sistema nervoso autónomo (SNA) poderá estar afetado neste tipo de patologias. Para avaliação de disfunções deste sistema pode ser utilizado a variabilidade da frequência cardíaca (VFC) e para o tratamento as microcorrentes NESA, que nos últimos anos tem vindo a crescer como método nã...
OUTLOOK OF A WEB-BASED OSCILLOSCOPE CLONE FOR E-LEARNING
Cardoso Ferreira, João Pedro; Rocha, André; Alves, Mário; Oliveira, PauloThis paper overviews the software architecture, implementation, applications, and preliminary user experience of a computer application that mimics an Oscilloscope and a Signal Generator, in the context of a course on fundamentals of electrical circuit analysis (TCIRC, ECE degree @ ISEP). This web app (available at http://osciloscopio.dee.isep.ipp.pt/) can operate in Simulation mode or Acquisition & Control...
A SNAPSHOT OF THE U=RISOLVE FRAMEWORK: SELF-LEARNING ELECTRIC CIRCUIT FUNDAMENT...
Rocha, André; Sousa, Lino; Alves, Mário; Pereira, FranciscoInnovative teaching and self-learning paradigms and tools have been emerging in the past decade, in a trend to boost motivation and autonomy in new generations of Electrical and Computer Engineering (ECE) students. In this context, we have been leveraging the U=RIsolve framework (https://urisolve.pt/app/), which aims at providing an interactive portal for teaching/self-learning the fundamentals of electric circ...
mRPL+: A mobility management framework in RPL/6LoWPAN
Fotouhi, Hossein; Moreira, Daniel; Alves, Mário; Yomsi, Patrick YomsiThe next generation Internet (also known as Internet-of-Things – IoT), will ubiquitously integrate trillions of computing devices of all kinds, shapes and sizes. For this ubiquity to materialize, a key aspect will certainly be interoperability, the capability of different technologies (e.g. different communication protocols at both horizontal and vertical levels, different hardware platforms, different operatin...
Z-Monitor: A protocol analyzer for IEEE 802.15.4-based low-power wireless networks
Tennina, Stefano; Gaddour, Olfa; Koubaa, Anis; Royo, Fernando; Alves, Mário; Abid, MahomedNetwork sniffers are invaluable tools for designing, testing, commissioning and running distributed embedded systems. They become even more useful if these systems build on low-power wireless networks (LoWPAN), particularly when these scale in density and/or space and impose stringent quality-of-service requirements. This paper presents Z-Monitor, a low-cost and open-source network/protocol analyzer for LoWPANs...
Reliable link quality estimation in low-power wireless networks and its impact ...
Baccour, Nouha; Koubâa, Anis; Youssef, Habib; Alves, MárioRadio link quality estimation is essential for protocols and mechanisms such as routing, mobility management and localization, particularly for low-power wireless networks such as wireless sensor networks. Commodity Link Quality Estimators (LQEs), e.g. PRR, RNP, ETX, four-bit and RSSI, can only provide a partial characterization of links as they ignore several link properties such as channel quality and stabili...
mRPL: Boosting mobility in the Internet of Things
Fotouhi, Hossein; Moreira, Daniel; Alves, MárioThe 6loWPAN (the light version of IPv6) and RPL (routing protocol for low-power and lossy links) protocols have become de facto standards for the Internet of Things (IoT). In this paper, we show that the two native algorithms that handle changes in network topology – the Trickle and Neighbor Discovery algorithms – behave in a reactive fashion and thus are not prepared for the dynamics inherent to nodes mobility...
On the Scalability of Constructive Interference in Low-Power Wireless Networks
Noda, Claro; Penichet, Carlos Pérez; Seeber, Balint; Zennaro, Marco; Alves, Mário; Moreira, AdrianoConstructive baseband interference has been recently introduced in low-power wireless networks as a promising technique enabling low-latency network flooding and sub-microsecond time synchronisation among network nodes. The scalability of this technique has been questioned in regards to the maximum temporalmisalignment among baseband signals, due to the variety of path delays in thenetwork. By contrast, we find...
On the scalability of constructive interference in low-power wireless networks
Noda, Claro; Pérez-Penichet, Carlos M.; Seeber, Balint; Zennaro, Marco; Alves, Mário; Moreira, AdrianoConstructive baseband interference has been recently introduced in low-power wireless networks as a promising technique enabling low-latency network flooding and sub-μs time synchronisation among network nodes. The scalability of this technique has been questioned in regards to the maximum temporal misalignment among baseband signals, due to the variety of path delays in the network. By contrast, we find that t...
Reliable and Fast Hand-Offs in Low-Power Wireless Networks
Fotouhi, Hossein; Alves, Mário; Zamalloa, Marco Zuniga; Koubâa, AnisHand-off (or hand-over), the process where mobile nodes select the best access point available to transfer data, has been well studied in wireless networks. The performance of a hand-off process depends on the specific characteristics of the wireless links. In the case of low-power wireless networks, hand-off decisions must be carefully taken by considering the unique properties of inexpensive low-power radios....