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Publicações

2017

Editorial

Autores
Pinho, LM;

Publicação
Ada User Journal

Abstract

2017

Evaluation of CGRA architecture for real-time processing of biological signals on wearable devices

Autores
Lopes, J; Sousa, D; Ferreira, JC;

Publicação
2017 INTERNATIONAL CONFERENCE ON RECONFIGURABLE COMPUTING AND FPGAS (RECONFIG)

Abstract
This paper describes the design and implementation of a coarse-grained reconfigurable array (CGRA) for low-power biological signal processing. It uses an use-case-driven approach which explores the application domain and gathers common requirements. The selected CGRA core architecture is implemented using a standard-cell flow (in a generic 90nm CMOS process), so that the CGRA can be totally or partially turned off by power gating. The selected CGRA design is evaluated for two use-cases using layout information and accurate node activity information. The resulting accelerator is capable of performing various signal processing tasks very efficiently, achieving an average power consumption of 19.9 pJ/cycle (or 1.99mW at 100 MHz). Static power consumption for less intensive tasks can be reduced by using only some sections of the CGRA while powering-off others.

2017

ECOAL Project-Delivering Solutions for Integrated Monitoring of Coal-Related Fires Supported on Optical Fiber Sensing Technology

Autores
Ribeiro, J; Viveiros, D; Ferreira, J; Lopez Gil, A; Dominguez Lopez, A; Martins, HF; Perez Herrera, R; Lopez Aldaba, A; Duarte, L; Pinto, A; Martin Lopez, S; Baierl, H; Jamier, R; Rougier, S; Auguste, JL; Teodoro, AC; Goncalves, JA; Esteban, O; Santos, JL; Roy, P; Lopez Amo, M; Gonzalez Herraez, M; Baptista, JM; Flores, D;

Publicação
APPLIED SCIENCES-BASEL

Abstract
The combustion of coal wastes resulting from mining is of particular environmental concern, and the importance of proper management involving real-time assessment of their status and identification of probable evolution scenarios is recognized. Continuous monitoring of the combustion temperature and emission levels of certain gases allows for the possibility of planning corrective actions to minimize their negative impact on the surroundings. Optical fiber technology is well suited to this purpose and here we describe the main attributes and results obtained from a fiber optic sensing system projected to gather data on distributed temperature and gas emissions in these harsh environments.

2017

The maximum edge weight clique problem: Formulations and solution approaches

Autores
Hosseinian, S; Fontes, DBMM; Butenko, S; Nardelli, MB; Fornari, M; Curtarolo, S;

Publicação
Springer Optimization and Its Applications

Abstract
Given an edge-weighted graph, the maximum edge weight clique (MEWC) problem is to find a clique that maximizes the sum of edge weights within the corresponding complete subgraph. This problem generalizes the classical maximum clique problem and finds many real-world applications in molecular biology, broadband network design, pattern recognition and robotics, information retrieval, marketing, and bioinformatics among other areas. The main goal of this chapter is to provide an up-to-date review of mathematical optimization formulations and solution approaches for the MEWC problem. Information on standard benchmark instances and state-of-the-art computational results is also included. © Springer International Publishing AG 2017.

2017

Analysis of the relationship between local climate change mitigation actions and greenhouse gas emissions - Empirical insights

Autores
Azevedo, I; Horta, I; Leal, VMS;

Publicação
ENERGY POLICY

Abstract
Local actions are seen as of major importance for the achievement of climate change mitigation targets. In the past few years, the number of local action plans towards climate change mitigation has been increasing, and it is essential to analyze their contribution to the achievement of global targets. Even if the relationship between local action plans and the reduction of energy use and GHG emissions is often assumed, this has not yet been validated nor quantified by empirical studies involving a large number of municipalities. Thus, the aim of this paper is to. perform an empirical analysis on the link between local action plans and energy use and GHG emissions. The analysis is composed by a test of hypothesis and a regression analysis, performed for the municipalities of three European countries Portugal, Sweden and United Kingdom. The main conclusion is that, in the context of these three countries, the analysis performed was not able to detect a significant impact related to the existence of local plans on GHG emissions. From the panel data regression analysis, it was possible to confirm that external factors, not directly related to local climate change mitigation actions, have a significant impact on GHG emissions.

2017

EV charging scheduler for overloading prevention of a distribution transformer supplying a factory

Autores
Godina, R; Rodrigues, EMG; Matias, JCO; Catalão, JPS;

Publicação
Proceedings - 2016 51st International Universities Power Engineering Conference, UPEC 2016

Abstract
The aim of this paper is to avoid overloading a private customer distribution transformer (DT) in a Portuguese insular area through the means of a new smart electric vehicle (EV) charging scheduler. Firstly, the consequence of the penetration of EVs on the dielectric oil deterioration of the DT of the industrial unit is estimated. The workplace allows the EVs to charge while their owners are working at three different working shifts during a day. Secondly, the EV charging scheduler is tested and the result scenarios are analyzed. This paper shows that the scheduling solution enables the industrial unit to avoid overloading the DT. It also allows to reduce the loss-of-life (LoL) of the DT, while recharging all EVs connected at the beginning of each working shift. © 2016 IEEE.

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