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Publications

2018

Improving Early Robotics Education Using a Line-Following Robot Simulator

Authors
De Lima P.V.S.G.; Bezerra M.H.R.A.; De Sousa Tavares A.C.; Jose Roberto Fonseca J.; Teixeira J.M.X.N.; Cajueiro J.P.C.; Melo G.N.; Henriques D.B.;

Publication
Proceedings - 15th Latin American Robotics Symposium, 6th Brazilian Robotics Symposium and 9th Workshop on Robotics in Education, LARS/SBR/WRE 2018

Abstract
Line-following robots have the ability to recognize and follow a line drawn on a surface. Elements of their operating principles could be used in the evelopment of numerous autonomous technologies, with applications in education and industry. A simulator has been developed to aide in performing several trials in order to validate a project. By taking the Pololu 3pi Robot as the model, the proposed solution simulates its physical structure, behavior, and operations-being able to read lines on surfaces-enabling the user to observe the robot following the line according to the code used. This paper aims to validate the developed simulator as an alternative to ease the process of learning to use the 3pi platform applied in both educational and competitive environments.

2018

Introduction

Authors
Pinho, LM; Quiñones, E; Bertogna, M; Marongiu, A; Nélis, V; Gai, P; Sancho, J;

Publication
High-Performance and Time-Predictable Embedded Computing

Abstract
This chapter provides an overview of the book theme, motivating the need for high-performance and time-predictable embedded computing. It describes the challenges introduced by the need for time-predictability on the one hand, and high-performance on the other, discussing on a high level how these contradictory requirements can be simultaneously supported.

2018

Kinetics of optical properties of human colorectal tissues during optical clearing: a comparative study between normal and pathological tissues

Authors
Carneiro, I; Carvelho, S; Silva, V; Henrique, R; Oliveira, L; Tuchin, VV;

Publication
JOURNAL OF BIOMEDICAL OPTICS

Abstract
To characterize the optical clearing treatments in human colorectal tissues and possibly to differentiate between treatments of normal and pathological tissues, we have used a simple indirect method derived from Mie scattering theory to estimate the kinetics of the reduced scattering coefficient. A complementary method to estimate the kinetics of the scattering coefficient is also used so that the kinetics of the anisotropy factor and of the refractive index are also calculated. Both methods rely only on the thickness and collimated transmittance measurements made during treatment. The results indicate the expected time dependencies for the optical properties of both tissues: an increase in the refractive index and anisotropy factor and a decrease in the scattering coefficients. The similarity in the kinetics obtained for normal and pathological tissues indicates that optical clearing treatments can be applied also in pathological tissues to produce similar effects. The estimated time dependencies using experimental spectral data in the range from 400 to 1000 nm allowed us to compare the kinetics of the optical properties between different wavelengths. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)

2018

Algorithm Selection for Collaborative Filtering: the influence of graph metafeatures and multicriteria metatargets

Authors
Cunha, T; Soares, C; de Carvalho, ACPLF;

Publication
CoRR

Abstract

2018

From CRM to CzRM - fundamental concepts

Authors
Duque, J; Varajao, J; Filipe, V;

Publication
2018 13TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI)

Abstract
Customer relationship management is critical for organizations. The public institutions, in particular the municipalities, are not an exception to this fact. However, these institutions have a number of peculiarities, as such their systems must be appropriate to their specific reality. In this article are presented the fundamental concepts of CRM (Customer Relationship Management) and CzRM (Citizen Relationship Management), discussing the distinctive characteristics of municipalities regarding other organizations.

2018

EMI Filter Design for a Single-stage Bidirectional and Isolated AC-DC Matrix Converter

Authors
Varajao, D; Araujo, RE; Miranda, LM; Pecas Lopes, JAP;

Publication
ELECTRONICS

Abstract
This paper describes the design of an electromagnetic interference (EMI) filter for the high-frequency link matrix converter (HFLMC). The proposed method aims to systematize the design process for pre-compliance with CISPR 11 Class B standard in the frequency range 150 kHz to 30 MHz. This approach can be extended to other current source converters which allows time-savings during the project of the filter. Conducted emissions are estimated through extended simulation and take into account the effect of the measurement apparatus. Differential-mode (DM) and common-mode (CM) filtering stages are projected separately and then integrated in a synergistic way in a single PCB to reduce volume and weight. A prototype of the filter was constructed and tested in the laboratory. Experimental results with the characterization of the insertion losses following the CISPR 17 standard are provided. The attenuation capability of the filter was demonstrated in the final part of the paper.

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