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962 results on '"Alves, Filipe"'

1. A computational study of algebraic coarse spaces for two-level overlapping additive Schwarz preconditioners

Author

Alves, Filipe A. C. S., Heinlein, Alexander, and Hajibeygi, Hadi

Subjects
Mathematics - Numerical Analysis
Abstract

The two-level overlapping additive Schwarz method offers a robust and scalable preconditioner for various linear systems resulting from elliptic problems. One of the key to these properties is the construction of the coarse space used to solve a global coupling problem, which traditionally requires information about the underlying discretization. An algebraic formulation of the coarse space reduces the complexity of its assembly. Furthermore, well-chosen coarse basis functions within this space can better represent changes in the problem's properties. Here we introduce an algebraic formulation of the multiscale finite element method (MsFEM) based on the algebraic multiscale solver (AMS) in the context of the two-level Schwarz method. We show how AMS is related to other energy-minimizing coarse spaces. Furthermore, we compare the AMS with other algebraic energy-minimizing spaces: the generalized Dryja-Smith-Widlund (GDSW), and the reduced dimension GDSW (RGDSW)., Comment: Submitted to the proceedings of the 28th International Conference on Domain Decomposition Methods (DDM28)

Published
2024

2. Scalar Perturbations in Nonsingular Universes from Interacting Vacuum

Author

Alves, Filipe Cattete and Maier, Rodrigo

Subjects
General Relativity and Quantum Cosmology
Abstract

In this paper we examine the stability of scalar perturbations in nonsingular models which emerge from an interacting vacuum component. The analysis developed in this paper relies on two phenomenological choices for the energy exchange between a nonrelativistic fluid and a vacuum component. In both scenarios it can be shown that closed models may furnish nonsingular orbits of physical interest in phase space once a decelerated past era is connected to a graceful exit to late-time acceleration. Regarding such configurations as background spacetimes we introduce scalar perturbations in order to examine the stability of these models in a high energy domain. We explicitly show that the vacuum perturbation is not an independent variable and diverges as dynamics approaches the bounce. This feature assigns a rather unstable signature to the dynamics making the choices for the energy transfer ill defined at least for nonsingular configurations at the bounce scale.

Published
2024
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5. Using OR-Tools When Solving the Nurse Scheduling Problem

Author

Oliveira, Márcia, Rocha, Ana Maria A. C., Alves, Filipe, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Pereira, Ana I., editor, Mendes, Armando, editor, Fernandes, Florbela P., editor, Pacheco, Maria F., editor, Coelho, João P., editor, and Lima, José, editor

Published
2024
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16. A Systematic Literature Review on Home Health Care Management

Author

Alves, Filipe, Rocha, Ana Maria A. C., Pereira, Ana I., Leitão, Paulo, 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, Abraham, Ajith, editor, Bajaj, Anu, editor, Gandhi, Niketa, editor, Madureira, Ana Maria, editor, and Kahraman, Cengiz, editor

Published
2023
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17. Tough Decision Making in Pembrolizumab-Associated Acute Interstitial Nephritis: A Case Report

Author

João Grilo, Joana Coutinho, Mário Góis, Catarina Reis Santos, Rui Alves Filipe, and Ernesto Rocha

Subjects
immune checkpoint inhibitors/adverse effects, neoplasms/drug therapy, nephritis, nterstitial/chemically induced, pembrolizumab/adverse effects, Pathology, RB1-214
Abstract

Pembrolizumab is an immune checkpoint inhibitor used as a cancer therapy. The incidence of immune related adverse events in patients receiving immune checkpoint inhibitors can be as high as 59%–85%. Renal adverse effects are uncommon, but the incidence of kidney toxicity related to pembrolizumab is rising as the use of this agent becomes more frequent. We present an uncommon case of biopsy-proven acute interstitial nephritis secondary to pembrolizumab in a patient with metastatic squamous cell carcinoma at the time of his fourth scheduled cycle. Despite the good initial tumor response, pembrolizumab had to be suspended and the patient started on corticosteroids with an initial good response. On his own initiative, the patient stopped prednisolone early, leading to a rebound acute kidney injury. Pembrolizumab was not reintroduced for the risk of further renal function worsening. His clinical status declined due to the progression of the neoplastic disease, and he was referred for palliative care. This case illustrates the importance of systematizing some key points in the approach to acute interstitial nephritis secondary to pembrolizumab: the role of the differential diagnosis of acute kidney injury in a patient under an immune checkpoint inhibitor, the role of glucocorticoids and the controversy about rechallenging this drug after a related acute interstitial nephritis.

Published
2023
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18. Did you miss it? Automatic lung nodule detection combined with gaze information improves radiologists' screening performance

Author

Aresta, Guilherme, Ferreira, Carlos, Pedrosa, João, Araújo, Teresa, Rebelo, João, Negrão, Eduardo, Morgado, Margarida, Alves, Filipe, Cunha, António, Ramos, Isabel, and Campilho, Aurélio

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, Computer Science - Computer Vision and Pattern Recognition
Abstract

Early diagnosis of lung cancer via computed tomography can significantly reduce the morbidity and mortality rates associated with the pathology. However, search lung nodules is a high complexity task, which affects the success of screening programs. Whilst computer-aided detection systems can be used as second observers, they may bias radiologists and introduce significant time overheads. With this in mind, this study assesses the potential of using gaze information for integrating automatic detection systems in the clinical practice. For that purpose, 4 radiologists were asked to annotate 20 scans from a public dataset while being monitored by an eye tracker device and an automatic lung nodule detection system was developed. Our results show that radiologists follow a similar search routine and tend to have lower fixation periods in regions where finding errors occur. The overall detection sensitivity of the specialists was 0.67$\pm$0.07, whereas the system achieved 0.69. Combining the annotations of one radiologist with the automatic system significantly improves the detection performance to similar levels of two annotators. Likewise, combining the findings of radiologist with the detection algorithm only for low fixation regions still significantly improves the detection sensitivity without increasing the number of false-positives. The combination of the automatic system with the gaze information allows to mitigate possible errors of the radiologist without some of the issues usually associated with automatic detection system., Comment: Submitted to IEEE Transactions on Biomedical Engineering (TBME)

Published
2019

22. A Hybrid Approach to Operational Planning in Home Health Care

Author

Alves, Filipe, Duarte, António J. S. T., Rocha, Ana Maria A. C., Pereira, Ana I., Leitão, Paulo, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Pereira, Ana I., editor, Košir, Andrej, editor, Fernandes, Florbela P., editor, Pacheco, Maria F., editor, Teixeira, João P., editor, and Lopes, Rui P., editor

Published
2022
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23. Solving a Capacitated Waste Collection Problem Using an Open-Source Tool

Author

Silva, A. S., Alves, Filipe, de Tuesta, J. L. Diaz, Rocha, Ana Maria A. C., Pereira, A. I., Silva, A. M. T., Leitão, Paulo, Gomes, H. T., Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Gervasi, Osvaldo, editor, Murgante, Beniamino, editor, Misra, Sanjay, editor, Rocha, Ana Maria A. C., editor, and Garau, Chiara, editor

Published
2022
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27. OS-020 MRI-serum based score accurately identifies liver transplant patients without rejection avoiding need for liver biopsy: a multisite european study

Author

Schaapman, Jelte, primary, Shumbayawonda, Elizabeth, additional, Castelo-Branco, Miguel, additional, Alves, Filipe Caseiro, additional, Costa, Tania, additional, Fitzpatrick, Emer, additional, Tupper, Katie, additional, Dhawan, Anil, additional, Deheragoda, Maesha, additional, Sticova, Eva, additional, French, Marika, additional, Beyer, Cayden, additional, Rymell, Soubera, additional, Tonev, Dimitar, additional, Verspaget, Hein W, additional, Neubauer, Stefan, additional, Banerjee, Rajarshi, additional, Lamb, Hildo, additional, and Coenraad, Minneke, additional

Published
2024
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36. Characterization of sludge from a cellulose pulp mill for its potential biovalorization.

Author

Alves, Filipe dos Santos, Condezo Castro, Tatiana Aurora, Gonçalves, Lindomar Matias, Pedroza, Marcelo Mendes, Coutinho de Paula, Eduardo, and Cardoso, Marcelo

Subjects
*CIRCULAR economy, *WASTE recycling, *SULFATE pulping process, *ACTIVATED carbon, *CRYSTAL structure, *PULP mills, *CELLULOSE fibers
Abstract

This study collected sludge samples from the kraft pulp mills of a Brazilian industry and physicochemically characterized them to investigate their biovalorization. The objective was to identify opportunities to produce value-added products, promoting the circular economy and environmentally appropriate destinations. The types of processes and raw materials influence sludge characteristics. The primary sludge was composed mainly of fibers and water, has a slightly alkaline pH, Carbon:Nitrogen (C:N) ratio is high attributed to fibers, and contains calcium, magnesium, phosphorus, and organic carbon. The biological sludge was rich in proteins, bacterial cells, and minerals. The analyses revealed functional groups such as hydroxyls and aliphatic methylene, high concentrations of carbon and oxygen, a fibrous and crystalline structure of cellulose in the primary sludge, and dense microparticles in the biological sludge. Thermogravimetry found a mass loss of 11 % and final combustion at 742 °C for the biological sludge. The primary sludge showed a mass loss of 38 % with peaks at 329 and 784 °C, which suggests that the primary sludge could be used as fuel. Potential routes for the use of the primary and biological sludge included its use as agricultural fertilizer, thermal processing, biochar, and production of activated carbon, despite the low calorific values. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Analysis of Spatiotemporal Gait Variables before and after Unilateral Total Knee Arthroplasty.

Author

Reis, David Almeida e, Sousa, Manoela Vieira, Fonseca, Pedro, Chaffaut, Antoine Amaudric du, Sousa, Joana, Pires, Jennifer, Moreira, Flávia, Alves, Filipe, Barroso, João, and Vilas-Boas, J. Paulo

Subjects
TOTAL knee replacement, WALKING speed, KNEE surgery, KNEE osteoarthritis, KNEE pain, KNEE
Abstract

This study aimed (a) to evaluate the spatiotemporal gait variables of total knee arthroplasty (TKA) before (pre-) and after the procedure (post-), and (b) to investigate the influence of the surgical side on these variables. Twenty-one volunteers (13 females and 8 males) participated, undergoing assessments pre-surgery and nine to 12 months post-surgery. Clinical tests indicated significant reductions in knee pain and improvements in active and passive extension post-surgery. TKA resulted in decreased pain, extension deficits, and functional assessments, with lower scores on the WOMAC questionnaire. A gait analysis showed post-surgery improvements in gait speed (5.8%), cycle time (−4.8%), step time (4.4%), double limb support time (−11.1%), step (4.4%) and stride (6.3%) lengths, and step (5.1%) and stride (5.0%) cadences. Comparisons between surgical side and limb dominance indicated significant differences in gait speed, stance, swing and step times, double limb support time, step and stride lengths, and step cadence. The non-dominant limb demonstrated greater improvements across most parameters compared to the dominant limb. These findings emphasize the importance of considering the limb dominance of patients with knee osteoarthritis when evaluating post-TKA function. These conclusions can be helpful for personalized rehabilitation programs, allowing tailored interventions for individuals undergoing knee surgery. [ABSTRACT FROM AUTHOR]

Published
2024
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38. Cluster Analysis for Breast Cancer Patterns Identification

Author

Azevedo, Beatriz Flamia, Alves, Filipe, Rocha, Ana Maria A. C., Pereira, Ana I., Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Pereira, Ana I., editor, Fernandes, Florbela P., editor, Coelho, João P., editor, Teixeira, João P., editor, Pacheco, Maria F., editor, Alves, Paulo, editor, and Lopes, Rui P., editor

Published
2021
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39. Multi-agent System Architecture for Distributed Home Health Care Information Systems

Author

Alves, Filipe, Rocha, Ana Maria A. C., Pereira, Ana I., Leitão, Paulo, Rannenberg, Kai, Editor-in-Chief, Soares Barbosa, Luís, Editorial Board Member, Goedicke, Michael, Editorial Board Member, Tatnall, Arthur, Editorial Board Member, Neuhold, Erich J., Editorial Board Member, Stiller, Burkhard, Editorial Board Member, Tröltzsch, Fredi, Editorial Board Member, Pries-Heje, Jan, Editorial Board Member, Kreps, David, Editorial Board Member, Reis, Ricardo, Editorial Board Member, Furnell, Steven, Editorial Board Member, Mercier-Laurent, Eunika, Editorial Board Member, Winckler, Marco, Editorial Board Member, Malaka, Rainer, Editorial Board Member, Camarinha-Matos, Luis M., editor, Ferreira, Pedro, editor, and Brito, Guilherme, editor

Published
2021
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40. Solving a Logistics System for Vehicle Routing Problem Using an Open-Source Tool

Author

Alves, Filipe, Pacheco, Filipe, Rocha, Ana Maria A. C., Pereira, Ana I., Leitão, Paulo, 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, Gervasi, Osvaldo, editor, Murgante, Beniamino, editor, Misra, Sanjay, editor, Garau, Chiara, editor, Blečić, Ivan, editor, Taniar, David, editor, Apduhan, Bernady O., editor, Rocha, Ana Maria A. C., editor, Tarantino, Eufemia, editor, and Torre, Carmelo Maria, editor

Published
2021
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46. Small Footprint Temperature Sensing NFC Tag

Author

Pereira, Jorge, primary, Garcia, Inês S., additional, Ribeiro, Gabriel, additional, Fernandes, José, additional, Alves, Filipe S., additional, Martins, Marco, additional, Cardoso, André, additional, and Dias, Rosana A., additional

Published
2024
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48. Hybrid System for Simultaneous Job Shop Scheduling and Layout Optimization Based on Multi-agents and Genetic Algorithm

Author

Alves, Filipe, Varela, M. Leonilde R., Rocha, Ana Maria A. C., Pereira, Ana I., Barbosa, José, Leitão, Paulo, 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, Madureira, Ana Maria, editor, Abraham, Ajith, editor, Gandhi, Niketa, editor, and Varela, Maria Leonilde, editor

Published
2020
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