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Publicações

2022

Retail Electricity Tariffs for Electric Vehicles in Europe: A Multivariate Analysis in 4 European Countries

Autores
Bairrão, DR; Soares, J; Canizes, B; Lezama, F; Vale, Z;

Publicação
IFAC-PapersOnLine

Abstract
During the past few years the transport matrix received many policies to push for the sector decarbonization. The electric vehicles and charging infrastructure increased a lot motivated by European Union directives and countries legislations, becoming national policies framework. Considering the electricity market dynamics, the electrification of transport created a new challenge going forward. In this context, this paper presents a multivariate analysis of electricity commercialization and charging infrastructure to evaluate the real state of electricity mobility and design future opportunities. The analysis uses tariffs, commercialization models, charging services and economic indicators of four countries. A comprehensive simulation model estimates the total electric mobility bill per country and the portion of the average salary spent with the car charging. Even considering the best scenario, consumers from Portugal commit almost four percent of its average wage while Norway commit only one percent. The results reveal that long-term commitment with energy planning, generation and energy matrix expansion, implies on lower energy costs; better economic actions also imply on lower energy expenditure for costumer. The hourly tariffs are important alternatives to reduce energy costs and manage demand helping network operators to plan and manage the energy system. © 2022 Elsevier B.V.. All rights reserved.

2022

Mid-level Harmonic Audio Features for Musical Style Classification

Autores
Almeida, FCF; Bernardes, G; Weiss, C;

Publicação
ISMIR

Abstract
The extraction of harmonic information from musical audio is fundamental for several music information retrieval tasks. In this paper, we propose novel harmonic audio features based on the perceptually-inspired tonal interval vector space, computed as the Fourier transform of chroma vectors. Our contribution includes mid-level features for musical dissonance, chromaticity, dyadicity, triadicity, diminished quality, diatonicity, and whole-toneness. Moreover, we quantify the perceptual relationship between short- and long-term harmonic structures, tonal dispersion, harmonic changes, and complexity. Beyond the computation on fixed-size windows, we propose a context-sensitive harmonic segmentation approach. We assess the robustness of the new harmonic features in style classification tasks regarding classical music periods and composers. Our results align with, slightly outperforming, existing features and suggest that other musical properties than those in state-of-the-art literature are partially captured. We discuss the features regarding their musical interpretation and compare the different feature groups regarding their effectiveness for discriminating classical music periods and composers. © F. Almeida, G. Bernardes, and C. Weiû.

2022

Configuration of Parallel Real-Time Applications on Multi-Core Processors

Autores
Gharajeh, MS; Carvalho, T; Pinho, LM;

Publicação
2022 IEEE 20TH INTERNATIONAL CONFERENCE ON INDUSTRIAL INFORMATICS (INDIN)

Abstract
Parallel programming models (e.g., OpenMP) are more and more used to improve the performance of real-time applications in modern processors. Nevertheless, these processors have complex architectures, being very difficult to understand their timing behavior. The main challenge with most of existing works is that they apply static timing analysis for simpler models or measurement-based analysis using traditional platforms (e.g., single core) or considering only sequential algorithms. How to provide an efficient configuration for the allocation of the parallel program in the computing units of the processor is still an open challenge. This paper studies the problem of performing timing analysis on complex multi-core platforms, pointing out a methodology to understand the applications' timing behavior, and guide the configuration of the platform. As an example, the paper uses an OpenMP-based program of the Heat benchmark on a NVIDIA Jetson AGX Xavier. The main objectives are to analyze the execution time of OpenMP tasks, specify the best configuration of OpenMP directives, identify critical tasks, and discuss the predictability of the system/application. A Linux perf based measurement tool, which has been extended by our team, is applied to measure each task across multiple executions in terms of total CPU cycles, the number of cache accesses, and the number of cache misses at different cache levels, including L1, L2 and L3. The evaluation process is performed using the measurement of the performance metrics by our tool to study the predictability of the system/application.

2022

Methodology for Predictive Cyber Security Risk Assessment (PCSRA)

Autores
Ferreira, DJ; Coelho, NM; Mamede, HS;

Publicação
CENTERIS/ProjMAN/HCist

Abstract

2022

Indoor location infrastructure for time management tools: a case study

Autores
Teixeira, A; Silva, H; Araujo, RE;

Publicação
Proceedings - 2022 International Young Engineers Forum in Electrical and Computer Engineering, YEF-ECE 2022

Abstract
Indoor localization systems are an important topic in the field of manufacturing process. A computational infrastructure based on Bluetooth low energy technology with state estimators for filtering is used to localize employees in the shop floor. The researchers' motivation is two-folds: implement an indoor tracking system while promoting manage production time. In this paper, we discuss the first prototype of a localization system adapted to address these goals. Experimental results show that the system for our case study, achieves a localization accuracy of less than three meters. © 2022 IEEE.

2022

Fracture characterisation of bone-cement bonded joints under mode I loading

Autores
Campos, TD; Barbosa, MLS; Olmos, AAR; Martins, M; Pereira, FAM; De Moura, MFSF; Zille, A; Dourado, N;

Publicação
THEORETICAL AND APPLIED FRACTURE MECHANICS

Abstract
Over the years, many techniques have been developed for the stabilisation of bone fractures. The study of the adhesion of bone-to-bone cement is an important step towards the development of new immobilization systems. Although bone cement has been used for more than fifty years, very few studies have been performed regarding the evaluation of fracture properties. In this work, numerical and experimental investigations were conducted to evaluate the strain energy release rate under mode I loading in a bone-cement bonded joint, using the Double Cantilever Beam (DCB) test. Cohesive zone laws were also measured combining the finite element method with non-linear elastic fracture mechanics. This has been made in a cortical bone bonded joint with polymethylmethacrylate (PMMA). Consistent results have been obtained regarding fracture toughness in a widely used bone-to-bone cement joint in many biomedical applications.

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