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25th IEEE International Conference on computer Supported Cooperative Work in Design, CSCWD 2022

作者： De Almeida, Marcos Antonio Correia, Antonio De Souza, Jano Moreira Schneider, Daniel Systems Engineering and Computer Science Program PESC/COPPE/UFRJ Rio de Janeiro Brazil Inesc Tec University of Trás-os-Montes e Alto Douro Vila Real Portugal Postgraduate Program in Informatics PPGI/UFRJ Rio de Janeiro Brazil Tércio Pacitti Institute of Computer Applications and Research NCE/UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781665405270

In this paper, we report on new findings about the results of an empirical study which aims to investigate how the COVID-19 pandemic has been shaping nomadic work practices and also challenging the lifestyles of digital nomads (DN). To do this, we collected textual data from posts in a Reddit community. We argue that, in order to understand how to design technical solutions for the so-called 'new normal' working conditions, one way to approach this is to understand how digital nomads are being impacted in their work practices and routines, and also how they are seeing the future of their technology-mediated work-life space. Finally, we show how evidence collected from DNs about their experiences and difficulties perceived during the pandemic period can inform CSCW researchers worldwide about future design-oriented strands. © 2022 IEEE.

关键词： COVID-19

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An ontology for the τ-theory of enterprise engineering

An ontology for the τ-theory of enterprise engineering

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作者： Dietz, Jan Aveiro, David Pombinho, João Hoogervorst, Jan Delft University of Technology Netherlands University of Madeira Portugal Madeira Interactive Technologies Institute Portugal Center for Organizational Design and Engineering INESC INOV Lisbon Portugal Department of Information Systems and Computer Science Instituto Superior Técnico University of Lisbon Portugal Sogeti Netherlands Netherlands

ISBN: (纸本)9781614994374

Enterprise engineering (EE) is a growing scientific discipline that takes the increasingly needed construction-oriented point of view, and aims to provide synthetic knowledge for letting enterprises more effectively and continuously adapt to threats and challenges. In this paper we present the τ-theory, being developed to support EE and consisting in the clarification of a series of foundational concepts of the EE domain like: system, model, subject, object, function, purpose and value, among others. Such clarification is then systematized in an ontology, together with an instantiation to validate it. © 2014 The authors and IOS Press. All rights reserved.

关键词： Ontology

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Kinect v2 based system for Parkinson's disease assessment

Kinect v2 based system for Parkinson's disease assessment

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Ana Patrícia Rocha Hugo Choupina José Maria Fernandes Maria José Rosas Rui Vaz João Paulo Silva Cunha Institute of Electronics and Telematics Engineering of Aveiro (IEETA) University of Aveiro Aveiro Portugal Institute for Systems Engineering and Computers - Technology and Science (INESC TEC) and Faculty of Engineering (FEUP) University of Porto Porto Portugal Movement Disorders Unit Portugal the Movement Disorders Unit University of Porto Porto Portugal Institute for Systems Engineering and Computers - Technology and Science (INESC TEC) and Faculty of Engineering (FEUP) Universidade do Porto Porto Porto PT

Human motion analysis can provide valuable information for supporting the clinical assessment of movement disorders, such as Parkinson's disease (PD). In this contribution, we study the suitability of a Kinect v2 based system for supporting PD assessment in a clinical environment, in comparison to the original Kinect (v1). In this study, 3-D body joint data were acquired from both normal subjects, and PD patients treated with deep brain stimulation (DBS). Then, several gait parameters were extracted from the gathered data. The obtained results show that 96% of the considered parameters are appropriate for distinguishing between non-PD subjects, PD patients with DBS stimulator switched on, and PD patients with stimulator switched off (p-value

关键词： Joints Elbow Shoulder Satellite broadcasting Diseases Switches Legged locomotion

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Development of a Low-Cost Interrogation System Using a MEMS Fabry-Pérot Tunable Filter 5

Development of a Low-Cost Interrogation System Using a MEMS ...

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5th International Conference on Applications of Optics and Photonics, AOP 2022

作者： Araújo, João C. C. Dias, Bernardo Dos Santos, Paulo S. S. De Almeida, J.M.M.M. Coelho, Luís C. C. INESC TEC - Institute for Systems and Computer Engineering Technology and Science FCUP Univ. of Porto R. Do Campo Alegre Porto4169-007 Portugal FCUP University of Porto Rua do Campo Alegre Porto4169-007 Portugal Dep. of Physics Univ. of Trás-os-Montes e Alto Douro Vila Real5001-801 Portugal

The interrogation of optic fiber sensors usually relies in complex and costly equipment with low portability due to their size such as Optical Spectrum Analyzers (OSA) or high-resolution spectrometers. Because of this, micro spectrometer devices, such as Micro-Electromechanical systems (MEMS) with Fabry-Pérot tunable filters, are emerging as simpler and compact alternatives capable of being used to acquire spectral information in a wide wavelength band. In this work it is described the development of an interrogation system capable of infrared spectroscopy using a MEMS Fabry-Pérot Interferometer (MEMS-FPI) with a spectral response in the 1350nm to 1650nm range. Its performance is tested with the interrogation of long period fiber gratings both as a refractive index sensor and as a temperature sensor. Deconvolution techniques such as Wiener filtering are used to reduce the impact of the tunable filter's impulse response in the measured signal. Results are comparable to those obtained using a typical OSA which shows the system's potential as a cheaper and more transportable alternative. © Published under licence by IOP Publishing Ltd.

关键词： Fiber optic sensors

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Simulation and Characterization of Magneto-Plasmonic Properties of Ag/Fe Nanostructure in Optical Fibers 28

Simulation and Characterization of Magneto-Plasmonic Propert...

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28th International Conference on Optical Fiber Sensors, OFS 2023

作者： Carvalho, João P.M. Coelho, Luís C.C. Jorge, P.A.S. de Almeida, J.M.M.M. INESC TEC Institute of Systems and Computer Engineering Technology and Science Department of Physics Faculty of Sciences University of Porto Rua do Campo Alegre Porto4169-007 Portugal Department of Physics and Astronomy FCUP Rua do Campo Alegre 687 Porto4150-179 Portugal School of Sciences and Technology Universidade de Trás-os-Montes e Alto Douro Vila Real5000-801 Portugal

Thin films of Ag/Fe were deposited on the core of multimode optical fibers. The deposited film shows sensitivity to both refractive index and MF changes. Simulation work based on TMM formalism confirms experimental re... 详细信息

ISBN: (纸本)9781957171302

关键词： Magnetos

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Line Fitting-Based Corner-Like Detector for 2D Laser Scanners Data*

Line Fitting-Based Corner-Like Detector for 2D Laser Scanner...

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International Conference on Autonomous Robots and Agents, ICARA

作者： Ricardo B. Sousa Héber Miguel Sobreira Manuel F. Silva António Paulo Moreira Faculty of Engineering University of Porto Porto Portugal INESC TEC - Institute for Systems and Computer Engineering Technology and Science Porto Portugal ISEP Polytechnic of Porto R. Dr. António Bernardinode Almeida Porto Portugal

ISBN: (数字)9798350394245

ISBN: (纸本)9798350394252

The extraction of geometric information from the environment may be of interest to localisation and mapping algorithms. Existent literature on extracting geometric features from 2D laser data focuses mainly on detecting lines. Regarding corners, most methodologies use the intersection of line segment features. This paper presents a feature extraction algorithm for corner-like points in the 2D laser scan. The proposed methodol-ogy defines arrival and departure neighbourhoods around each scan point and performs local line fitting evaluated in multiple distance-based scales. Then, a set of indicators based on line fitting error, the angle between arrival and departure lines, and consecutive observation of the same keypoint across different scales determine the existence of a corner-like feature. The experiments evaluated the corner-like features regarding their relative position and observability, achieving standard deviations on the relative position lower than the sensor noise and visibility ratios higher than 75% with very low false positives rates.

关键词： Laser noise Fitting Detectors Feature extraction Robot sensing systems Data mining Mobile robots

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Direct-Steered-DRRT*: A 3D RRT-based planner improvement

Direct-Steered-DRRT*: A 3D RRT-based planner improvement

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IEEE International Conference on Autonomous Robot systems and Competitions (ICARSC)

作者： Maria S. Lopes Manuel F. Silva João Pedro C. de Souza Pedro Costa Technology and Science INESC TEC – Institute for Systems and Computer Engineering FEUP – Faculty of Engineering University of Porto Porto Portugal ISEP – Instituto Superior de Engenharia do Porto Instituto Politécnico do Porto Porto Portugal

ISBN: (数字)9798350352344

ISBN: (纸本)9798350352351

The advancement of technology has led to a growing demand for autonomy across various sectors. A key aspect of achieving autonomous navigation through intricate environments is path planning, initially confined to 2D spaces but rapidly evolving to address the complexities of 3D environments. Despite the widespread adoption of RRT-based planners, their inherent lack of optimality has encouraged researchers to find refinements. This paper transposes an existing algorithm developed for 2D environments to 3D, leveraging a heuristic to optimize the generated paths in terms of path length, memory consumed, and execution time. Along with this scalability to 3D scenarios, a modification was introduced that trades off some execution time for a substantial improvement in path length. The results obtained from a series of simulated experimental tests prove the efficacy of the proposed method in 3D environments, demonstrating reduced memory consumption and execution time compared to conventional approaches.

关键词： Three-dimensional displays Smoothing methods Heuristic algorithms Scalability Memory management Robustness Path planning

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Message Security for Automation and Control Applications based on IEC61131-3

Message Security for Automation and Control Applications bas...

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Future technologies Conference

作者： Aydin Homay Mario de Sousa Antonio Pina Martins Fred Kashefi SYSTEC - Research Center for Systems - Faculty of Engineering University of Porto Porto 4200-465 Portugal INESC TEC - INESC Technology and Science and Faculty of Engineering University of Porto Porto 4200-465 Portugal Computer Science and Engineering University of Texas at Arlington Arlington TX 76019-0015 USA

ISBN: (纸本)9781509041725

Cyber-Physical systems are integration of computer-based equipment used in industrial automation, embedded systems, control systems and etc. computer-based equipment needs to be protected against unauthorized access and control. The widely accepted approach to computer security is based on security in depth, meaning that the computer system is viewed as a layered structure and security is introduced at each of the layers. In this paper, we propose a method of adding security at what is commonly viewed as the lowest level of control the PLC. The approach is based on hashing the process variables or called signals. In this approach an attacking virus is not able to interpret the variables being addressed by the control logic, and therefore inhibiting targeted attacks by a virus wishing to subtly change the controlled system operation without actually destroying the controlled plant. The approach is focused towards DCS whose operation is based on maintaining all variables in an RTDB that exist in the RTOS and used by IEC61131-3 based application.

关键词： Message Virus Cybersecurity Authentication Industrial Control systems

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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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Evaluation of the performance of a photovoltaic power plant installed in a building in the north of Portugal

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Energy Procedia 2018年 153卷 42-47页

作者： Gustavo Pinto Monteiro Ana I. Palmero-Marrero Carlos Moreira Armando C. Oliveira University of Porto Mechanical Engineering Department Rua Dr. Roberto Frias 4200-465 Porto Portugal Institute of Systems and Computers Engineering Technology and Science (INESC TEC) Rua Dr. Roberto Frias 4200-465 Porto Portugal

In this work, the evaluation of the performance of a small-size photovoltaic plant, with 15 kWp of capacity, is made and some proposals for its optimization are presented. The plant consists of a grid-connected centralized system, where the output power is consumed in the same building. The PV plant production data of the last couple of years are analysed, filtering the periods of inoperation. To obtain an accurate prediction of the efficiency and power output, the characteristics of all plant components were introduced in SAM software. The results obtained through the simulations and the measured output power values were compared.

关键词： Photovoltaics solar energy power plant grid-connected SAM software

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