2020
Autores
Umaraliev, R; Moura, R; Havenith, H; Almeida, F; Nizamiev, AG;
Publicação
European Journal of Engineering Research and Science
Abstract
2020
Autores
Ferreira, PJC; Gomes, LMF; Oliveira, AS; Moura, RMM; Lourenço, JM;
Publicação
A Aplicação do Conhecimento Científico nas Engenharias 3
Abstract
2020
Autores
Matos, T; Faria, CL; Martins, MS; Henriques, R; Gomes, PA; Goncalves, LM;
Publicação
SENSORS
Abstract
A cost-effective optical instrument for continuous in-situ monitoring applications is presented. With a production cost in raw materials of 38 Euro, a power consumption of 300 mu A in sleep mode and 100 mA in active mode (5 ms reading), and a capacity to monitor turbidity and sedimentary displacement at eight different depths in the water column, the sensor was developed for sediment monitoring in coastal areas. Due to the extent and dynamics of the processes involved in these areas, observations require a wide spatial and temporal resolution. Each of the eight monitoring nodes uses one infrared backscatter channel, to estimate turbidity and sediment concentration, and one ultraviolet with one infrared transmitted light channels to distinguish organic/inorganic composition of the suspended material load. An in-lab calibration was conducted, using formazine to correlate turbidity with the electronic outputs of the instrument. An analysis of the influence of external light sources and correction techniques were performed. Moreover, an in-lab experiment was conducted to study the behaviour of the sensor-to-sediment transport, wash load and sediment accumulation. The device was deployed, with a water level sensor, in an estuarine area with high sediment dynamics. The monitoring data were analysed, showing the potential of the device to continuously monitor turbidity, sediment processes, and distinguish between organic and inorganic matter, at the different depths in the water column.
2019
Autores
Truppel, A; Tseng, TM; Bertozzi, D; Alves, JC; Schlichtmann, U;
Publicação
PROCEEDINGS OF THE 2019 INTERNATIONAL SYMPOSIUM ON PHYSICAL DESIGN (ISPD '19)
Abstract
Optical Networks-on-Chip (ONoCs) are a promising solution for high-performance multi-core integration with better latency and bandwidth than traditional Electrical NoCs. Wavelength-routed ONoCs (WRONoCs) offer yet additional performance guarantees. However, WRONoC design presents new EDA challenges which have not yet been fully addressed. So far, most topology analysis is abstract, i.e., overlooks layout concerns, while for layout the tools available perform Place & Route (P&R) but no topology optimization. Thus, a need arises for a novel optimization method combining both aspects of WRONoC design. In this paper such a method, PSION, is laid out. When compared to the state-of-the-art design procedure, results show a 1.8x reduction in maximum optical insertion loss.
2019
Autores
Machado da Silva, JM; Carlos Alves, JC;
Publicação
2019 XXXIV CONFERENCE ON DESIGN OF CIRCUITS AND INTEGRATED SYSTEMS (DCIS)
Abstract
An alternative approach to compute the signal to noise ratio of analogue to digital converters based on the computation of the cross-correlation coefficient of the captured response is proposed here. It is shown, after simulation and experimental results, that this approach allows obtaining good accuracy results with the added advantages of not requiring coherent sampling and high purity sine wave stimuli.
2019
Autores
Truppel, A; Tseng, T; Bertozzi, D; Alves, JC; Schlichtmann, U;
Publicação
Proceedings of the 2019 International Symposium on Physical Design
Abstract
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