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Publicações

2022

A Note on Type-Symmetries in Finite Games

Autores
Soeiro, R; Pinto, AA;

Publicação
MATHEMATICS

Abstract
In two-action generalized polymatrix games, Nash equilibria are support-type-symmetric, i.e., determined by supports for each type of player. We show that such a property does not generalize straightforwardly for games with at least three actions or where interaction weights have different signs (neither all positive nor negative). A non-trivial condition on interaction weights must be satisfied, which may go unnoticed as it is trivially satisfied for: (i) two-action games, (ii) conformity games, and (iii) congestion games. We derive this condition and the corresponding simplified analytic equation for mixed strategies.

2022

Keck Adaptive Optics Facility: Real Time Controller Upgrade

Autores
Chin J.C.Y.; Cetre S.; Wizinowich P.; Ragland S.; Lilley S.; Wetherell E.; Surendran A.; Correia C.; Marin E.; Biasi R.; Patauner C.; Pescoller D.; Glazebrook K.; Jameson A.; Gauvin W.; Rigaut F.; Gratadour D.; Bernard J.;

Publicação
Proceedings of SPIE - The International Society for Optical Engineering

Abstract
The W. M. Keck Observatory Adaptive Optics (AO) facilities have been operating with a Field Programmable Gate Array (FPGA) based real time controller (RTC) since 2007. The RTC inputs data from various AO wavefront and tip/tilt sensors; and corrects image blurring from atmospheric turbulence via deformable and tip/tilt mirrors. Since its commissioning, the Keck I and Keck II RTCs have been upgraded to support new hardware such as pyramid wavefront and infrared tip-tilt sensors. However, they are reaching the limits of their capabilities in terms of processing bandwidth and the ability to interface with new hardware. Together with the Keck All-sky Precision Adaptive optics (KAPA) project, a higher performance and a more reliable RTC is needed to support next generation capabilities such as laser tomography and sensor fusion. This paper provides an overview of the new RTC system, developed with our contractor/collaborators (Microgate, Swinburne University of Technology and Australian National University), and the initial on-sky performance. The upgrade includes an Interface Module to interface with the wavefront sensors and controlled hardware, and a Graphical Processing Unit (GPU) based computational engine to meet the system's control requirements and to provide a flexible software architecture to allow future algorithms development and capabilities. The system saw first light in 2021 and is being commissioned in 2022 to support single conjugate laser guide star (LGS) AO, along with a more sensitive EMCCD camera. Initial results are provided to demonstrate single NGS & LGS performance, system reliability, and the planned upgrade for four LGS to support laser tomography.

2022

Sensor Architecture Model for Unmanned Aerial Vehicles Dedicated to Electrical Tower Inspections

Autores
Berger, GS; Braun, J; Júnior, AO; Lima, J; Pinto, MF; Pereira, AI; Valente, A; Soares, SFP; Rech, LC; Cantieri, AR; Wehrmeister, MA;

Publicação
OPTIMIZATION, LEARNING ALGORITHMS AND APPLICATIONS, OL2A 2022

Abstract
This research proposes positioning obstacle detection sensors by multirotor unmanned aerial vehicles (UAVs) dedicated to detailed inspections in high voltage towers. Different obstacle detection sensors are analyzed to compose a multisensory architecture in a multirotor UAV. The representation of the beam pattern of the sensors is modeled in the CoppeliaSim simulator to analyze the sensors' coverage and detection performance in simulation. A multirotor UAV is designed to carry the same sensor architecture modeled in the simulation. The aircraft is used to perform flights over a deactivated electrical tower, aiming to evaluate the detection performance of the sensory architecture embedded in the aircraft. The results obtained in the simulation were compared with those obtained in a real scenario of electrical inspections. The proposed method achieved its goals as a mechanism to early evaluate the detection capability of different previously characterized sensor architectures used in multirotor UAV for electrical inspections.

2022

Explainable Biometrics in the Age of Deep Learning

Autores
Neto, PC; Gonçalves, T; Pinto, JR; Silva, W; Sequeira, AF; Ross, A; Cardoso, JS;

Publicação
CoRR

Abstract

2022

Traços transdisciplinares na obra do Padre Manuel Antunes: uma análise crítica à luz da Carta da Transdisciplinaridade/UNESCO – 1994

Autores
Mucheroni, Marcos; Marcos, Adérito;

Publicação
Repensar Portugal, a Europa e a Globalização: saber Padre Manuel Antunes, SJ – 100 anos

Abstract
Toda a obra e pensamento do Padre Manuel Antunes se revestem de características de grande abrangência e de capacidade de abertura à inovação, na perspetiva de que o pensamento crítico, sendo perscrutador do desconhecido, enquanto questiona o conhecimento adquirido ou em pesquisa, não se pode fechar em si mesmo ou separar partes do conhecimento de um todo que constitui o universo, e o homem como parte deste, já que se objetiva a compreensão última do Todo. Encontramos, portanto, traços de transdisciplinaridade na obra e pensamento do Padre Manuel Antunes indicando um pioneirismo relativamente ao movimento da transdisciplinaridade que arranca com o primeiro congresso da área e a respetiva carta daí resultante. Neste artigo, os autores propõem uma análise crítica da obra do Padre Manuel Antunes à luz dos princípios fundacionais encontrados na Carta da Transdisciplinaridade de 1994.;All the work and thought of Father Manuel Antunes are characterized by a wide scope and openness to innovation, in the perspective that all critical thinking, as it searches the unknown while questioning the understanding acquired or still under research, cannot be closed in itself or be separated from the knowledge as a whole that constitutes the universe, of which the human being is part, since the ultimate understanding of the Whole is sought. We find, therefore, traces of transdisciplinarity in the work and thought of Father Manuel Antunes indicating a pioneering spirit with respect to the transdisciplinarity movement that starts with the first congress in this area and the establishment of the respective charter of principles. In this article, the authors propose a critical analysis of the work of Father Manuel Antunes in light of the foundational principles depicted in the Charter of Transdisciplinarity of 1994.

2022

Teaching HCI Engineering: Four Case Studies

Autores
Caffiau, S; Campos, JC; Martinie, C; Nigay, L; Palanque, P; Spano, LD;

Publicação
SENSE, FEEL, DESIGN, INTERACT 2021

Abstract
The paper presents the work carried out at the HCI Engineering Education workshop, organised by IFIP working groups 2.7/13.4 and 13.1. It describes four case studies of projects and exercises used in Human-Computer Interaction Engineering courses. We propose a common framework for presenting the case studies and describe the four case studies in detail. We then draw conclusions on the differences between the presented case studies that highlight the diversity and multidisciplinary aspects to be taught in a Human-Computer Interaction Engineering course. As future work, we plan to create a repository of case studies as a resource for teachers.

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