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Publications

2022

Improved PV Control that Considers Charging Restrictions of Lithium-Ion Battery

Authors
Saeed M.R.; Imran R.M.; Alwez M.A.; Flaih F.M.F.; Ur Rahman Habib H.;

Publication
2022 IEEE International Conference on Power and Energy Advancement in Power and Energy Systems Towards Sustainable and Resilient Energy Supply Pecon 2022

Abstract
Lithium-ion battery is one of the most used energy storage technologies in recent times. Enhancing the life span of the Lithium-ion battery is an issue that has technical and economic contributions. This paper addresses improving the life span of Lithium-ion batteries through the appropriate way of charging in the PV system. A modified control methodology is applied for the DC-DC converter-based charger that implements the maximum power point tracking algorithm with considering the battery-safe charging recommendations. The control methodology has been implemented in Matlab Simulink and effectively verified through the simulation results.

2022

The multi-object adaptive optics system for the Gemini Infra-Red Multi-Object Spectrograph

Authors
Chapman S.C.; Conod U.; Turri P.; Jackson K.; Lardiere O.; Sivanandam S.; Andersen D.; Correia C.; Lamb M.; Ross C.; Sivo G.; Veran J.P.;

Publication
Proceedings of SPIE - The International Society for Optical Engineering

Abstract
The Gemini Infra-Red Multi-Object Spectrograph (GIRMOS) is a four-arm, Multi-Object Adaptive Optics (MOAO) IFU spectrograph being built for Gemini (commissioning in 2024). GIRMOS is being planned to interface with the new Gemini-North Adaptive Optics (GNAO) system, and is base lined with a requirement of 50% EE within a 0.100 spaxel at H-band. We present a design and forecast the error budget and performance of GIRMOS-MOAO working behind GNAO. The MOAO system will patrol the 20 field of regard of GNAO, utilizing closed loop GLAO or MCAO for lower order correction. GIRMOS MOAA will perform tomographic reconstruction of the turbulence using the GNAO WFS, and utilize order 16x16 actuator DMs operating in open loop to perform an additional correction from the Pseudo Open Loop (POL) slopes, achieving close to diffraction limited performance from the combined GNAO+MOAO correction. This high performance AO spectrograph will have the broadest impact in the study of the formation and evolution of galaxies, but will also have broad reach in fields such as star and planet formation within our Milky Way and supermassive black holes in nearby galaxies.

2022

The Impact of Artificial Intelligence on a Learning Management System in a Higher Education Context: A Position Paper

Authors
Manhiça, R; Santos, A; Cravino, J;

Publication
Technology and Innovation in Learning, Teaching and Education - Third International Conference, TECH-EDU 2022, Lisbon, Portugal, August 31 - September 2, 2022, Revised Selected Papers

Abstract
Artificial intelligence (AI) has been developing, and its application is spreading at a good pace in recent years, so much so that AI has become part of everyday life in various sectors. According to several international reports, AI in Education is one of the emerging fields of technology in the education sector, from where much research is being developed to support educational processes. This paper aims to provide an overview of the research on AI applications in education management systems (LMS) in higher education through a systematic literature review following the protocol proposed by Kitchenham [1]. Three hundred six papers were initially identified from Scopus and EBSCOhost databases from 2010 to 2022, from which 33 papers were selected for final analysis according to the defined inclusion and exclusion criteria. The research results show that the LMS most used for implementing AI solutions in education is Moodle and that AI has been most used for student performance assessment based on student data. Among the AI algorithms used, Random Forest, Neural Networks, K-means, Naive Bayes, Support Vector Machine, and decision trees stand out. © 2022 IEEE Computer Society. All rights reserved.

2022

Student Engagement Detection Using Emotion Analysis, Eye Tracking and Head Movement with Machine Learning

Authors
Sharma, P; Joshi, S; Gautam, S; Maharjan, S; Khanal, SR; Reis, MC; Barroso, J; Filipe, VMD;

Publication
TECHNOLOGY AND INNOVATION IN LEARNING, TEACHING AND EDUCATION, TECH-EDU 2022

Abstract
With the increase of distance learning, in general, and e-learning, in particular, having a system capable of determining the engagement of students is of primordial importance, and one of the biggest challenges, both for teachers, researchers and policymakers. Here, we present a system to detect the engagement level of the students. It uses only information provided by the typical built-in web-camera present in a laptop computer, and was designed to work in real time. We combine information about the movements of the eyes and head, and facial emotions to produce a concentration indexwith three classes of engagement: very engaged, nominally engaged and not engaged at all. The system was tested in a typical e-learning scenario, and the results show that it correctly identifies each period of time where students were very engaged, nominally engaged and not engaged at all. Additionally, the results also show that the students with best scores also have higher concentration indexes.

2022

Dynamic Urban Solid Waste Management System for Smart Cities

Authors
Silva, AS; Brito, T; de Tuesta, JLD; Lima, J; Pereira, AI; Silva, AMT; Gomes, HT;

Publication
LEARNING AND INTELLIGENT OPTIMIZATION, LION 16

Abstract
Increasing population in cities combined with efforts to obtain more sustainable living spaces will require a smarter Solid Waste Management System (SWMS). A critical step in SWMS is the collection of wastes, generally associated with expensive costs faced by companies or municipalities in this sector. Some studies are being developed for the optimization of waste collection routes, but few consider inland cities as model regions. Here, the model region considered for the route optimization using Guided Local Search (GLS) algorithm was Bragança, a city in the northeast region of Portugal. The algorithm used in this work is available in open-source Google OR-tools. Results show that waste collection efficiency is affected by the upper limit of waste in dumpsters. Additionally, it is demonstrated the importance of dynamic selection of dumpsters. For instance, efficiency decreased 10.67% for the best upper limit compared to the traditional collection in the regular selection of dumpsters (levels only). However, an improvement of 50.45% compared to traditional collection was observed using dynamic selection of dumpsters to be collected. In other words, collection cannot be improved only by letting dumpsters reach 90% of waste level. In fact, strategies such as the dynamic selection here presented, can play an important role to save resources in a SWMS.

2022

OCFR 2022: Competition on Occluded Face Recognition From Synthetically Generated Structure-Aware Occlusions

Authors
Neto, PC; Boutros, F; Pinto, JR; Damer, N; Sequeira, AF; Cardoso, JS; Bengherabi, M; Bousnat, A; Boucheta, S; Hebbadj, N; Erakin, ME; Demir, U; Ekenel, HK; Vidal, PBD; Menotti, D;

Publication
2022 IEEE INTERNATIONAL JOINT CONFERENCE ON BIOMETRICS (IJCB)

Abstract
This work summarizes the IJCB Occluded Face Recognition Competition 2022 (IJCB-OCFR-2022) embraced by the 2022 International Joint Conference on Biometrics (IJCB 2022). OCFR-2022 attracted a total of 3 participating teams, from academia. Eventually, six valid submissions were submitted and then evaluated by the organizers. The competition was held to address the challenge of face recognition in the presence of severe face occlusions. The participants were free to use any training data and the testing data was built by the organisers by synthetically occluding parts of the face images using a well-known dataset. The submitted solutions presented innovations and performed very competitively with the considered baseline. A major output of this competition is a challenging, realistic, and diverse, and publicly available occluded face recognition benchmark with well defined evaluation protocols.

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