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arXiv 2020年

作者： Ferreira, Mafalda Falcão Camacho, Rui Teixeira, Luís F. Doctoral Program in Informatics Engineering Faculty of Engineering University of Porto INESC TEC - Institute for Systems and Computer Engineering Technology and Science Porto Portugal Department of Informatics Engineering Faculty of Engineering University of Porto Porto - Portugal

Cancer is still one of the most devastating diseases of our time. One way of automatically classifying tumor samples is by analyzing its derived molecular information (i.e., its genes expression signatures). In this work, we aim to distinguish three different types of cancer: thyroid, skin, and stomach. For that, we compare the performance of a Denoising Autoencoder (DAE) used as weight initialization of a deep neural network. Although we address a different domain problem in this work, we have adopted the same methodology of Ferreira et al.. In our experiments, we assess two different approaches when training the classification model: (a) fixing the weights, after pre-training the DAE, and (b) allowing fine-tuning of the entire classification network. Additionally, we apply two different strategies for embedding the DAE into the classification network: (1) by only importing the encoding layers, and (2) by inserting the complete autoencoder. Our best result was the combination of unsupervised feature learning through a DAE, followed by its full import into the classification network, and subsequent fine-tuning through supervised training, achieving an F1 score of 98.04% ± 1.09 when identifying cancerous thyroid samples. Copyright © 2020, The Authors. All rights reserved.

关键词： Classification (of information)

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COVID-19 as Opportunity to Test Digital Nomad Lifestyle

COVID-19 as Opportunity to Test Digital Nomad Lifestyle

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International Conference on computer Supported Cooperative Work in Design

作者： Marcos Antonio de Almeida António Correia Daniel Schneider Jano Moreira de Souza Systems Engineering and Computer Science Program (PESC/COPPE/UFRJ) Rio de Janeiro Brazil INESC TEC and University of Trás-os-Montes e Alto Douro Vila Real Portugal Tércio Pacitti Institute of Computer Applications and Research NCE/UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781728165974;9781728165981

We report the first findings of an empirical study aimed at investigating how COVID-19 pandemic has impacted the work practices and lifestyles of digital nomads (DN). To do this, we analyzed messages, questions and comments posted by digital nomads in a specific online discussion community of the Reddit social network. Preliminary findings indicate COVID-19 as an opportunity to test DN lifestyle by aspiring digital nomads who want to plan their careers and also present evidence of an overload of online channels for actual DNs. On the other hand, we found that much of the literature on digital nomadism is fragmented and scattered through different disciplines and perspectives, with a strong focus on digital nomads' lifestyles. In order to obtain a holistic and unified understanding of digital nomads, we conducted a comprehensive literature review to further conceptualize the phenomenon under study.

关键词： COVID-19 Social networking (online) Pandemics engineering profession Conferences Bibliographies Collaborative work

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Whole-body phase plane analysis for standard maximum vertical jump assessment

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Gait & Posture 2021年 90卷 203-204页

作者： Rodrigues, C. Correia, M. Abrantes, J. Rodrigues, B. Nadal, J. INESC TEC - Institute for Systems and Computer Engineering- Technology and Science C-BER - Centre for Biomedical Engineering Research Porto Portugal University of Porto Faculty of Engineering Porto Portugal Lusófona University CICANT Centre for Research in Applied Communication Culture and New Technologies - MovLab Laboratory of Technologies for Interactions and Interfaces Lisbon Portugal Federal University of Pernambuco Department of Electronic and Systems Recife Brazil Federal University of Rio de Janeiro Biomedical Engineering Program Rio de Janeiro Brazil

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Lower limb joint angular phase plane coordination analysis on standard maximum vertical jump

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Gait & Posture 2021年 90卷 205-206页

作者： Rodrigues, C. Correia, M. Abrantes, J. Rodrigues, B. Nadal, J. INESC TEC - Institute for Systems and Computer Engineering- Technology and Science C-BER - Centre for Biomedical Engineering Research Porto Portugal University of Porto Faculty of Engineering Porto Portugal Lusófona University CICANT Centre for Research in Applied Communication Culture and New Technologies- MovLab Laboratory of Technologies for Interactions and Interfaces Lisbon Portugal Federal University of Pernambuco Department of Electronic and Systems Recife Brazil Federal University of Rio de Janeiro Biomedical Engineering Program Rio de Janeiro Brazil

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Grid-forming inverters replacing Diesel generators in small-scale islanded power systems

Grid-forming inverters replacing Diesel generators in small-...

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Power tech Conference

作者： Pedro P. Beires Carlos L. Moreira João Peças Lopes INESC TEC (Institute for Systems and Computer Engineering Technology and Science) Porto Portugal

This paper addresses the stability analysis of a real island power system following the transformation occurring in the generation portfolio: from a 100 % synchronous-generation-based system (associated to a fleet of diesel generators) to a hybrid power system dominated by power electronics converters. The integration of a battery-wind-photovoltaic power plant in the island creates the necessary conditions for operating the system without synchronous units-scenarios with a system dominated by power electronics - or, at least to minimize its use-scenarios with a reduced number of synchronous units in operation. The possibility of operating the system under these conditions is assured by grid-forming inverters connected to battery energy storage systems, that are responsible for performing frequency and voltage control tasks either in parallel with synchronous units or when synchronous units are disconnected. The resulting transient stability issues for the aforementioned operational scenarios are discussed and evaluated through dynamic simulations.

关键词： Batteries Power system stability Power generation Generators Voltage control Inverters Frequency control

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A realistic simulation environment as a teaching aid in educational robotics

A realistic simulation environment as a teaching aid in educ...

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IEEE Latin American Robotics Symposium, LARS

作者： José Lima Rebeca B. Kalbermatter João Braun Thadeu Brito Guido Berger Paulo Costa Research Centre in Digitalization and Intelligent Robotics (CeDRI) Instituto Politécnico de Bragança (IPB) Bragança Portugal Laboratório para a Sustentabilidade e Tecnologia em Regiões de Montanha (SusTEC) Instituto Politécnico de Bragança (IPB) Bragança Portugal Centre for Robotic in Industry and Intelligent Systems Institute for Systems and Computer Engineering Technology and Science (INESC-TEC) Porto Portugal Faculdade de Engenharia Universidade do Porto Porto Portugal Universidade de Trás-os-Montes e Alto Douro Vila Real Portugal

ISBN: (数字)9781665462808

ISBN: (纸本)9781665462815

The experimental component is an essential method in engineering education. Sometimes the availability of laboratories and components is compromised, and the COVID-19 pandemic worsened the situation. Resorting to an accurate simulation seems to help this process by allowing students to develop the work, program, test, and validate it. Moreover, it lowers the development time and cost of the prototyping stages of a robotics project. As a multidisciplinary area, robotics requires simulation environments with essential characteristics, such as dynamics, connection to hardware (embedded systems), and other applications. Thus, this paper presents the Simulation environment of SimTwo, emphasizing previous publications with models of sensors, actuators, and simulation scenes. The simulator can be used for free, and the source code is available to the community. Proposed scenes and examples can inspire the development of other simulation scenes to be used in electrical and mechanical engineering projects.

关键词： Mechanical sensors Embedded systems Pandemics Source coding Laboratories Sensor phenomena and characterization Robot sensing systems

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Towards a Wireless System that Can Monitor the Encapsulation of mm-sized Active Implants in vivo for Bioelectronic Medicine

Towards a Wireless System that Can Monitor the Encapsulation...

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International IEEE/EMBS Conference on Neural engineering, CNE

作者： Gonçalo Rodrigues Mariana Neca João Silva Diogo Brito Taimur Rabuske Jorge Fernandes Rainer Mohrlok Christoph Jeschke Jannis Meents Kambiz Nanbakhsh Vasiliki Giagka INESC-ID Instituto Superior Técnico Universidade de Lisboa Multichannel Systems MCS GmbH Germany Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft The Netherlands Fraunhofer Institute for Reliability and Microintegration IZM Berlin Germany

Active neural interfaces for bioelectronic medicine are envisioned to be mm-sized. Such miniaturization is at the moment hampered by the available wireless power techniques as well as the large volume the conventional hermetic packaging adds to the implant. Alternatively, conformal coatings are being explored for the protection of the implant electronics. Such approach has the potential to allow for the use of RF (radio-frequency) energy for powering, and miniaturization to the extreme of having a single IC (integrated circuit) as the whole implant (single chip implants). The longevity of conformal encapsulation can be assessed using accelerated soak tests in a dedicated apparatus in vitro, but these are usually not sufficient, as they fail to reveal additional failure modes that manifest themselves in vivo. Therefore, to investigate the performance of conformal coatings in vivo a compact, mm-sized wireless monitoring system is required. The development of such a system exhibits several challenges, mostly concerned with how to receive enough energy in such a small implant to power the monitoring sensor and transmit information regarding the integrity of the coating. In this paper we propose a system architecture for such a mm-sized wireless system, suitable for medium-to-Iong term monitoring of implants, by designing the whole system as a single monolithic IC. It is shown, by experiments, simulation or analytically that the identified challenges are possible to overcome, allowing to proceed towards the practical prototype.

关键词： Wireless communication Encapsulation Radio frequency In vivo Wireless sensor networks systems architecture Implants

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Environmental Sensitivity of Fabry-Perot Microcavities Induced by Layered Graphene-Dielectric Hybrid Coatings

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Physical Review Applied 2021年第4期16卷 044041-044041页

作者： Rui Peixoto J.P. Santos Pires Catarina S. Monteiro Maria Raposo Paulo A. Ribeiro Susana O. Silva Orlando Frazão J.M. Viana Parente Lopes Centro de Física das Universidades do Minho e Porto and Faculty of Sciences University of Porto Porto 4169-007 Portugal Institute for Systems and Computer Engineering Technology and Science (INESC TEC) and Department of Physics and Astronomy Faculty of Sciences University of Porto Rua do Campo Alegre 687 Porto 4169-007 Portugal Faculty of Engineering University of Porto R. Dr. Roberto Frias Porto 4200-465 Portugal Laboratory of Instrumentation Biomedical Engineering and Radiation Physics (LIBPhys-UNL) Department of Physics NOVA School of Science and Technology NOVA University Lisbon Caparica 2829-516 Portugal

We propose a fiber-based environmental sensor that exploits the reflection-phase-shift tunability provided by the use of layered coatings composed of dielectric slabs spaced by conducting membranes. A transfer-matrix study is done in a simplified theoretical model, for which an enhanced sensitivity of the reflection interference pattern to the output medium is demonstrated, in the typical refractive index range of liquid media. An experimental configuration using a cascaded Fabry-Perot microcavity coated by a graphene oxide/polyethylenimine (GO/PEI) multilayered structure is demonstrated. Its cost-effective chemical production method makes graphene oxide–based hybrid coatings excellent candidates for future real-life sensing devices.

关键词： Metrology Optical microcavities Dielectrics Graphene Multilayer thin films Optical fibers Optical sources & detectors Fabry-Pérot interferometry

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A Dijkstra-Inspired Algorithm for Optimized Real-Time Tasking with Minimal Energy Consumption

A Dijkstra-Inspired Algorithm for Optimized Real-Time Taskin...

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International Conference on Environment and Electrical engineering (EEEIC)

作者： Mohamed Lotfi Abdelrahman Ashraf Mustafa Zahran Georges Samih Mohammad Javadi Gerardo J. Osório João P. S. Catalão Faculty of Energy Systems and Nuclear Science Ontario Tech University Oshawa ON Canada German University in Cairo New Cairo Egypt Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Porto Portugal C-MAST University of Beira Interior Covilhã Portugal

ISBN: (数字)9781728174556

ISBN: (纸本)9781728174563

A highly versatile optimal task scheduling algorithm is proposed, inspired by Dijkstra's shortest path algorithm. The proposed algorithm is named “Dijkstra Optimal Tasking” (DOT) and is implemented in a generic manner allowing it to be applicable on a plethora of tasking problems In this study, the application of the proposed DOT algorithm is demonstrated for industrial setting in which a set of tasks must be performed by a mobile agent transiting between charging stations. The DOT algorithm is demonstrated by determining the optimal task schedule for the mobile agent which maximizes the speed of task achievement while minimizing the movement, and thereby energy consumption, cost. A discussion into the anticipated plethora of applications of this algorithm in different sectors is examined.

关键词： Task analysis Mobile agents Computational modeling Object oriented modeling Graph theory Heating systems Charging stations

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Equivalent dynamic model of active distribution networks for large voltage disturbances

Equivalent dynamic model of active distribution networks for...

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Power tech Conference

作者： Nuno Fulgêncio Carlos Moreira Leonel Carvalho João Peças Lopes INESC TEC Institute for Systems and Computer Engineering Technology and Science Porto Portugal Faculty of Engineering (FEUP) INESC TEC University of Porto Porto Portugal INESC TEC University of Porto Faculty of Engineering INESC TEC

This paper proposes a “grey-box” dynamic equivalent model for medium voltage active distribution networks, taking into account a heterogeneous fleet of generation technologies alongside the latest European grid codes requirements. It aims to properly represent the transient behavior of the system upon large voltage disturbances in the transmission side. The proposed equivalent model is composed by four main components: two equivalent generation units, one for converter-connected units' representation, and another accounting for the synchronous generation units' portfolio; an equivalent composite load model; and a battery energy storage system, also converter-connected to the grid. The model's parameters are estimated by an evolutionary particle swarm optimization algorithm, by comparing a fully-detailed model of a medium voltage distribution network with the equivalent model's frequency domain's responses of active and reactive power flows, at the boundary of distribution-transmission interface substation.

关键词： Mathematical model Load modeling Computational modeling Transient analysis Power system stability Power system dynamics Reactive power

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