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218 results on '"Portugal, David"'

4. 3D Multi-Robot Exploration with a Two-Level Coordination Strategy and Prioritization

Author

Freda, Luigi, Novo, Tiago, Portugal, David, and Rocha, Rui P.

Subjects
Computer Science - Robotics
Abstract

This work presents a 3D multi-robot exploration framework for a team of UGVs moving on uneven terrains. The framework was designed by casting the two-level coordination strategy presented in [1] into the context of multi-robot exploration. The resulting distributed exploration technique minimizes and explicitly manages the occurrence of conflicts and interferences in the robot team. Each robot selects where to scan next by using a receding horizon next-best-view approach [2]. A sampling-based tree is directly expanded on segmented traversable regions of the terrain 3D map to generate the candidate next viewpoints. During the exploration, users can assign locations with higher priorities on-demand to steer the robot exploration toward areas of interest. The proposed framework can be also used to perform coverage tasks in the case a map of the environment is a priori provided as input. An open-source implementation is available online.

Published
2023

5. Continuous User Identification in Distance Learning: A Recent Technology Perspective

Author

Portugal, David, Faria, José N., Belk, Marios, Martins, Pedro, Constantinides, Argyris, Pietron, Anna, Pitsillides, Andreas, Avouris, Nikolaos, and Fidas, Christos A.

Abstract

The worldwide shift to distance learning at Higher Education Institutions (HEIs) during the COVID-19 global pandemic has raised several concerns about the credibility of online academic activities, especially regarding student identity management. Traditional online frameworks cannot guarantee the authenticity of the enrolled student, which requires instructors to manually verify their identities, a time-consuming task that compromises academic quality. This article presents a comprehensive review of existing efforts around continuous user identification, focusing on intelligent proctoring systems and automatic identification methods, as well as their applicability in this domain. We conclude that there is a clear need for continuous user identification technology by HEIs, but existing systems lack agile system integration models that combine many inputs, such as face, voice and behavioural data in a practical manner, and encounter numerous barriers related to data protection during implementation.

Published
2023
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6. 3D Traversability Analysis in Forest Environments Based on Mechanical Effort

Author

Carvalho, Afonso E., Ferreira, João Filipe, Portugal, David, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Petrovic, Ivan, editor, Menegatti, Emanuele, editor, and Marković, Ivan, editor

Published
2023
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8. A localization approach for autonomous underwater vehicles: A ROS-Gazebo framework

Author

Vaz, Frederico C., Portugal, David, Araújo, André, Couceiro, Micael S., and Rocha, Rui P.

Subjects
Computer Science - Robotics
Abstract

Autonomous Underwater Vehicles (AUVs) have the ability to operate in harsh underwater environments without endangering human lives in the process. Nevertheless, just like their ground and aerial counterparts, AUVs need to be able to estimate their own position. Yet, unlike ground and aerial robots, estimating the pose of AUVs is very challenging, with only a few high-cost technological solutions available in the market. In this paper, we present the development of a realistic underwater acoustic model, implemented within the Robot Operating System (ROS) and the Gazebo simulator framework, for localization of AUVs using a set of water surface robots, time of flight of underwater propagated acoustic waves, and a multilateration genetic algorithm approach.

Published
2018

9. SocialRobot: Towards a Personalized Elderly Care Mobile Robot

Author

Portugal, David, Santos, Luís, Trindade, Pedro, Christophorou, Christophoros, Andreou, Panayiotis, Georgiadis, Dimosthenis, Belk, Marios, Freire, João, Alvito, Paulo, Samaras, George, Christodoulou, Eleni, and Dias, Jorge

Subjects
Computer Science - Robotics, Computer Science - Human-Computer Interaction
Abstract

SocialRobot is a collaborative European project, which focuses on providing a practical and interactive solution to improve the quality of life of elderly people. Having this in mind, a state of the art robotic mobile platform has been integrated with virtual social care technology to meet the elderly individual needs and requirements, following a human centered approach. In this short paper, we make an overview of SocialRobot, the developed architecture and the human-robot interactive scenarios being prepared and tested in the framework of the project for dissemination and exploitation purposes.

Published
2018

14. Robotics Use Case Scenarios

Author

Machado, Pedro, Bonnell, Jack, Brandenbourg, Samuel, Ferreira, João Filipe, Portugal, David, Couceiro, Micael, Jahre, Magnus, editor, Göhringer, Diana, editor, and Millet, Philippe, editor

Published
2021
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17. Requirements Specification and Integration Architecture for Perception in a Cooperative Team of Forestry Robots

Author

Portugal, David, Ferreira, João Filipe, Couceiro, Micael S., Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Mohammad, Abdelkhalick, editor, Dong, Xin, editor, and Russo, Matteo, editor

Published
2020
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19. Tailoring a ROS Educational Programming Language Architecture

Author

Tatarian, Karen, Pereira, Samuel, Couceiro, Micael S., Portugal, David, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Lepuschitz, Wilfried, editor, Merdan, Munir, editor, Koppensteiner, Gottfried, editor, Balogh, Richard, editor, and Obdržálek, David, editor

Published
2019
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20. MoDSeM: Towards Semantic Mapping with Distributed Robots

Author

Martins, Gonçalo S., Ferreira, João Filipe, Portugal, David, Couceiro, Micael S., Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Althoefer, Kaspar, editor, Konstantinova, Jelizaveta, editor, and Zhang, Ketao, editor

Published
2019
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21. A Versatile Visual Navigation System for Autonomous Vehicles

Author

Majer, Filip, Halodová, Lucie, Vintr, Tomáš, Dlouhý, Martin, Merenda, Lukáš, Fentanes, Jaime Pulido, Portugal, David, Couceiro, Micael, Krajník, Tomáš, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, and Mazal, Jan, editor

Published
2019
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22. Robotics Use Case Scenarios

Author

Machado, Pedro, primary, Bonnell, Jack, additional, Brandenbourg, Samuel, additional, Ferreira, João Filipe, additional, Portugal, David, additional, and Couceiro, Micael, additional

Published
2020
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30. Identification of an Individual’s Frustration in the Work Environment Through a Multi-sensor Computer Mouse

Author

Portugal, David, Belk, Marios, Quintas, João, Christodoulou, Eleni, Samaras, George, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Zhou, Jia, editor, and Salvendy, Gavriel, editor

Published
2016
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36. CogniWin – A Virtual Assistance System for Older Adults at Work

Author

Hanke, Sten, Meinedo, Hugo, Portugal, David, Belk, Marios, Quintas, João, Christodoulou, Eleni, Sili, Miroslav, Dias, Miguel Sales, Samaras, George, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Zhou, Jia, editor, and Salvendy, Gavriel, editor

Published
2015
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37. A Versatile Visual Navigation System for Autonomous Vehicles

Author

Majer, Filip, primary, Halodová, Lucie, additional, Vintr, Tomáš, additional, Dlouhý, Martin, additional, Merenda, Lukáš, additional, Fentanes, Jaime Pulido, additional, Portugal, David, additional, Couceiro, Micael, additional, and Krajník, Tomáš, additional

Published
2019
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