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207 results on '"Freitas, João P."'

1. Bayesian inference for scale mixtures of skew-normal linear models under the centered parameterization

Author

de Freitas, João Victor B. and Azevedo, Caio L. N.

Subjects
Statistics - Methodology
Abstract

In many situations we are interested in modeling real data where the response distribution, even conditionally on the covariates, presents asymmetry and/or heavy/light tails. In these situations, it is more suitable to consider models based on the skewed and/or heavy/light tailed distributions, such as the class of scale mixtures of skew-normal distributions. The classical parameterization of this distributions may not be good due to the some inferential issues when the skewness parameter is in a neighborhood of 0, then, the centered parameterization becomes more appropriate. In this paper, we developed a class of scale mixtures of skew-normal distributions under the centered parameterization, also a linear regression model based on them was proposed. We explore a hierarchical representation and set up a MCMC scheme for parameter estimation. Furthermore, we developed residuals and influence analysis tools. A Monte Carlo experiment is conducted to evaluate the performance of the MCMC algorithm and the behavior of the residual distribution. The methodology is illustrated with the analysis of a real data set.

Published
2024

3. Massive graviton from diffeomorphism invariance

Author

de Freitas, João M. L. and Kuntz, Iberê

Subjects
High Energy Physics - Theory, General Relativity and Quantum Cosmology
Abstract

We describe a mechanism in which the graviton acquires a mass from the functional measure without violating the diffeomorphism symmetry nor including St\"uckelberg fields. Since gauge invariance is not violated, the number of degrees of freedom goes as in general relativity. For the same reason, Boulware-Deser ghosts and the vDVZ disconinuity do not show up. The graviton thus becomes massive at the quantum level while avoiding the usual issues of massive gravity.

Published
2023

4. FUNCK: Information Funnels and Bottlenecks for Invariant Representation Learning

Author

de Freitas, João Machado and Geiger, Bernhard C.

Subjects
Computer Science - Machine Learning
Abstract

Learning invariant representations that remain useful for a downstream task is still a key challenge in machine learning. We investigate a set of related information funnels and bottleneck problems that claim to learn invariant representations from the data. We also propose a new element to this family of information-theoretic objectives: The Conditional Privacy Funnel with Side Information, which we investigate in fully and semi-supervised settings. Given the generally intractable objectives, we derive tractable approximations using amortized variational inference parameterized by neural networks and study the intrinsic trade-offs of these objectives. We describe empirically the proposed approach and show that with a few labels it is possible to learn fair classifiers and generate useful representations approximately invariant to unwanted sources of variation. Furthermore, we provide insights about the applicability of these methods in real-world scenarios with ordinary tabular datasets when the data is scarce., Comment: 28 pages

Published
2022

5. Compressed Hierarchical Representations for Multi-Task Learning and Task Clustering

Author

de Freitas, João Machado, Berg, Sebastian, Geiger, Bernhard C., and Mücke, Manfred

Subjects
Computer Science - Machine Learning
Abstract

In this paper, we frame homogeneous-feature multi-task learning (MTL) as a hierarchical representation learning problem, with one task-agnostic and multiple task-specific latent representations. Drawing inspiration from the information bottleneck principle and assuming an additive independent noise model between the task-agnostic and task-specific latent representations, we limit the information contained in each task-specific representation. It is shown that our resulting representations yield competitive performance for several MTL benchmarks. Furthermore, for certain setups, we show that the trained parameters of the additive noise model are closely related to the similarity of different tasks. This indicates that our approach yields a task-agnostic representation that is disentangled in the sense that its individual dimensions may be interpretable from a task-specific perspective., Comment: Accepted by the 2022 International Joint Conference on Neural Networks (IJCNN 2022)

Published
2022
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10. Investigating academic performance and perceptions of human physiology and exercise physiology courses among undergraduate students of physical education at a Brazilian public university

Author

Rodrigues, Mila Alves Matos, Silva, Rizia Rocha, Santos, Douglas Assis Teles, de Freitas, João Victor Rosa, Gentil, Paulo, Vieira, Carlos Alexandre, Rebelo, Ana Cristina Silva, Andrade, Marília Santos, Campos, Mário Hebling, de Conti Teixeira Costa, Gustavo, Knechtle, Beat, Vancini, Rodrigo Luiz, and de Lira, Claudio Andre Barbosa

Published
2024
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13. Identifying influential patents in citation networks using enhanced VoteRank centrality

Author

Freitas, João C. S., Barbastefano, Rafael, and Carvalho, Diego

Subjects
Computer Science - Social and Information Networks, Computer Science - Digital Libraries, Physics - Physics and Society
Abstract

This study proposes the usage of a method called VoteRank, created by Zhang et al. (2016), to identify influential nodes on patent citation networks. In addition, it proposes enhanced VoteRank algorithms, extending the Zhang et al. work. These novel algorithms comprise a reduction on the voting ability of the nodes affected by a chosen spreader if the nodes are distant from the spreader. One method uses a reduction factor that is linear regarding the distance from the spreader, which we called VoteRank-LRed. The other method uses a reduction factor that is exponential concerning the distance from the spreader, which we called VoteRank-XRed. By applying the methods to a citation network, we were able to demonstrate that VoteRank-LRed improved performance in choosing influence spreaders more efficiently than the original VoteRank on the tested citation network., Comment: 10 pages, 3 figures

Published
2018

15. Interconnected marine habitats form a single continental-scale reef system in South America

Author

Carneiro, Pedro B. M., Ximenes Neto, Antônio R., Jucá-Queiroz, Bruno, Teixeira, Carlos E. P., Feitosa, Caroline V., Barroso, Cristiane X., Matthews-Cascon, Helena, de Morais, Jader O., Freitas, João E. P., Santander-Neto, Jones, de Araújo, Jorge T., Monteiro, Leonardo H. U., Pinheiro, Lidriana S., Braga, Marcus D. A., Cordeiro, Ralf T. S., Rossi, Sergio, Bejarano, Sonia, Salani, Sula, Garcia, Tatiane M., Lotufo, Tito M. C., Smith, Tyler B., Faria, Vicente V., and Soares, Marcelo O.

Published
2022
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19. Facial Expressions Tracking and Recognition: Database Protocols for Systems Validation and Evaluation

Author

Miranda, Catarina Runa, Mendes, Pedro, Coelho, Pedro, Alvarez, Xenxo, Freitas, João, Dias, Miguel Sales, and Orvalho, Verónica Costa

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Each human face is unique. It has its own shape, topology, and distinguishing features. As such, developing and testing facial tracking systems are challenging tasks. The existing face recognition and tracking algorithms in Computer Vision mainly specify concrete situations according to particular goals and applications, requiring validation methodologies with data that fits their purposes. However, a database that covers all possible variations of external and factors does not exist, increasing researchers' work in acquiring their own data or compiling groups of databases. To address this shortcoming, we propose a methodology for facial data acquisition through definition of fundamental variables, such as subject characteristics, acquisition hardware, and performance parameters. Following this methodology, we also propose two protocols that allow the capturing of facial behaviors under uncontrolled and real-life situations. As validation, we executed both protocols which lead to creation of two sample databases: FdMiee (Facial database with Multi input, expressions, and environments) and FACIA (Facial Multimodal database driven by emotional induced acting). Using different types of hardware, FdMiee captures facial information under environmental and facial behaviors variations. FACIA is an extension of FdMiee introducing a pipeline to acquire additional facial behaviors and speech using an emotion-acting method. Therefore, this work eases the creation of adaptable database according to algorithm's requirements and applications, leading to simplified validation and testing processes., Comment: 10 pages, 6 images, Computers & Graphics

Published
2015

22. Effect of Asymptomatic and Symptomatic COVID-19 on Acute Ischemic Stroke Revascularization Outcomes

Author

Strambo, Davide, Marto, João Pedro, Ntaios, George, Nguyen, Thanh N., Michel, Patrik, Herzig, Roman, Członkowksa, Anna, Demeestere, Jelle, Yassin Mansour, Ossama, Georgiopoulos, Georgios, Nogueira, Raul G., Salerno, Alexander, Wegener, Susanne, Baumgartner, Philipp, Cereda, Carlo W., Bianco, Giovanni, Beyeler, Morin, Arnold, Marcel, Carrera, Emmanuel, Machi, Paolo, Altersberger, Valerian, Bonati, Leo, Gensicke, Henrik, Bolognese, Manuel, Peters, Nils, Wetzel, Stephan, Magriço, Marta, Nuno Ramos, João, Sargento-Freitas, João, Machado, Rita, Maia, Carolina, Machado, Egídio, Paiva-Nunes, Ana, Ferreira, Patrícia, Pinho-e-Melo, Teresa, Carvalho-Dias, Mariana, Paula, André, Alberto Correia, Manuel, Castro, Pedro, Azevedo, Elsa, Albuquerque, Luís, Nuno-Alves, José, Ferreira-Pinto, Joana, Meira, Torcato, Pereira, Liliana, Rodrigues, Miguel, Araújo, André, Rodrigues, Marta, Rocha, Mariana, Pereira-Fonseca, Ângelo, Ribeiro, Luís, Varela, Ricardo, Cappellari, Manuel, Zivelonghi, Cecilia, Sajeva, Giulia, Zini, Andrea, Gentile, Mauro, Forlivesi, Stefano, Migliaccio, Ludovica, Sessa, Maria, Pezzini, Alessandro, Sangalli, Davide, Zedde, Marialuisa, Pascarella, Rosario, Diamanti, Susanna, Beretta, Simone, Schwarz, Ghil, Frisullo, Giovanni, Marcheselli, Simona, Seners, Pierre, Sabben, Candice, Escalard, Simon, Piotin, Michel, Maier, Benjamin, Charbonnier, Guillaume, Vuillier, Fabrice, Legris, Loic, Cuisenier, Pauline, Vodret, Francesca R., Marnat, Gaultier, Liegey, Jean-Sebastien, Sibon, Igor, Flottmann, Fabian, Broocks, Gabriel, Gloyer, Nils-Ole, Bohmann, Ferdinand O., Hendrik Schaefer, Jan, Nolte, Christian H., Audebert, Heinrich, Siebert, Eberhard, Sykora, Marek, Lang, Wilfried, Ferrari, Julia, Mayer-Suess, Lukas, Knoflach, Michael, Gizewski, Elke-Ruth, Stolp, Jeffrey, Stolze, Lotte J., Coutinho, Jonathan M., Nederkoorn, Paul J., van-den-Wijngaard, Ido, de Meris, Joke, Lemmens, Robin, De Raedt, Sylvie, Vandervorst, Fenne, Pierre Rutgers, Matthieu, Guilmot, Antoine, Dusart, Anne, Bellante, Flavio, Calleja-Castaño, Patricia, Ostos, Fernando, Gonzalez-Ortega, Guillermo, Martín-Jiménez, Paloma, García-Madrona, Sebastian, Cruz-Culebras, Antonio, Vera, Rocio, Matute, Maria-Consuelo, Fuentes, Blanca, Alonso-de-Leciñana, María, Rigual, Ricardo, Díez-Tejedor, Exuperio, Pérez-Sánchez, Soledad, Montaner, Joan, Díaz-Otero, Fernando, Perez de la Ossa, Natalia, Flores-Pina, Belén, Muñoz-Narbona, Lucia, Chamorro, Angel, Rodríguez-Vázquez, Alejandro, Renú, Arturo, Ayo-Martin, Oscar, Hernandez-Fernandez, Francisco, Segura, Tomas, Tejada-Meza, Herbert, Hlaing, Thant, See, Isaiah, Simister, Robert, Werring, David J., Saxhaug Kristoffersen, Espen, Nordanstig, Annika, Jood, Katarina, Rentzos, Alexandros, Šimůnek, Libor, Krajíčková, Dagmar, Krajina, Antonín, Mikulík, Robert, Cviková, Martina, Vinklárek, Jan, Školoudík, David, Roubec, Martin, Hurtikova, Eva, Hrubý, Rostislav, Ostry, Svatopluk, Skoda, Ondrej, Pernicka, Marek, Kočí, Lubomír, Eichlová, Zuzana, Jíra, Martin, Kovář, Martin, Panský, Michal, Mencl, Pavel, Paloušková, Hana, Tomek, Aleš, Janský, Petr, Olšerová, Anna, Šrámek, Martin, Havlíček, Roman, Malý, Petr, Trakal, Lukáš, Fiksa, Jan, Slovák, Matěj, Karliński, Michał, Nowak, Maciej, Sienkiewicz-Jarosz, Halina, Bochynska, Anna, Wrona, Pawel, Homa, Tomasz, Sawczynska, Katarzyna, Slowik, Agnieszka, Wlodarczyk, Ewa, Wiącek, Marcin, Tomaszewska-Lampart, Izabella, Sieczkowski, Bartosz, Bartosik-Psujek, Halina, Bilik, Marta, Bandzarewicz, Anna, Dorobek, Malgorzata, Zielińska-Turek, Justyna, Nowakowska-Kotas, Marta, Obara, Krystian, Urbanowski, Paweł, Budrewicz, Sławomir, Guziński, Maciej, Świtońska, Milena, Rutkowska, Iwona, Sobieszak-Skura, Paulina, Łabuz-Roszak, Beata, Dębiec, Aleksander, Staszewski, Jacek, Stępień, Adam, Zwiernik, Jacek, Wasilewski, Grzegorz, Tiu, Cristina, Terecoasă, Elena-Oana, Radu, Razvan-Alexandru, Negrila, Anca, Dorobat, Bogdan, Panea, Cristina, Tiu, Vlad, Petrescu, Simona, Özcan-Özdemir, Atilla, Mahmoud, Mostafa, El-Samahy, Hussam, Abdelkhalek, Hazem, Al-Hashel, Jasem, Ibrahim Ismail, Ismail, Salmeen, Athari, Ghoreishi, Abdoreza, Sabetay, Sergiu, Gross, Hana, Klein, Piers, Abdalkader, Mohamad, Jabbour, Pascal, El Naamani, Kareem, Tjoumakaris, Stavropoula, Abbas, Rawad, Mohamed, Ghada-A., Chebl, Alex, Min, Jiangyong, Hovingh, Majesta, Tsai, Jenny, Khan, Muhib-A., Nalleballe, Krishna, Onteddu, Sanjeeva, Masoud, Hesham E., Michael, Mina, Kaur, Navreet, Maali, Laith, Abraham, Michael, Khandelwal, Priyank, Bach, Ivo, Ong, Melody, Babici, Denis, Khawaja, Ayaz-M., Hakemi, Maryam, Rajamani, Kumar, Cano-Nigenda, Vanessa, Arauz, Antonio, Amaya, Pablo, Llanos, Natalia, Arango, Akemi, Vences, Miguel A., Barrientos, José-Domingo, Caetano, Rayllene, Targa, Rodrigo, Scollo, Sergio, Yalung, Patrick, Nagendra, Shashank, Gaikwad, Abhijit, and Seo, Kwon-Duk

Published
2024
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23. Effects of twelve weeks of dance Exergames on the quality-of-life variables of elderly Brazilian women enrolled in a community program.

Author

dos Santos, Rafaela G., de Freitas, João V.R., Alcantara, Lara M., Lopes, Giovanna G.C., Galvão, Lucas L., de Queiroz, Bruno M., Santos, Douglas A.T., de Lira, Claudio A.B., Andrade, Marilia S., Knechtle, Beat, Nikolaidis, Pantelis T., and Vancini, Rodrigo L.

Abstract

Exercise-based interventions can be a safe alternative to improve and maintain physical and mental health during the aging process. The aim of the present study was to evaluate the effects of a 12-week training program with Dance Exergames on the mood and functional fitness profile of elderly women. The sample (n = 22) was divided into Exergames (EG, n = 9, 70.6 ± 1.6 years) and Control Groups (CG, n = 13, 73.6 ± 2.2 years). Evaluations were carried out before and after the interventions. Each participant played, in pairs, the electronic game Dance Central 3, with the XBOX 360 Kinect console (Slim, Microsoft, USA). The EG trained for 12 weeks (24 sessions), with two weekly sessions of 50 min and the CG performed manual activities workshops. In functional fitness, both exercise training with exergame (EG) and the intervention model for the CG did not produce significant effects regarding interaction (group*time). Mood state presented significant effect of time intervention regarding tension (p = <0.001), depression (p = 0.001), anger (p = 0.030), fatigue (p = 0.001), and mental confusion (p = 0.004). Twelve weeks of training with a dance exergame (for, EG) and manual activities (for, CG) is enough to promote improvements in the mood state of healthy elderly women. This is an interesting result, as it shows that social interaction is as important a component as improving functional capacity. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Fatigue life estimation of dental implants using a combination of the finite element method and traditional fatigue criteria

Author

Hernandez, Bruno A, Freitas, João PO, and Capello Sousa, Edson A

Abstract

Failure by fatigue can be sudden and catastrophic. Therefore, ensuring that dental implants, which are under constant cyclic loading, do not fail to fatigue is imperative. The majority of the studies about the topic only performed in vitro tests, which are expensive and time-consuming. The Finite Element (FE) method is less costly and it allows the simulation of several different loading scenarios. Nonetheless, there are only a few studies analysing fatigue in dental prostheses using FE models, and the few available did not include all the relevant parameters, such as geometry effect, surface finishing, etc. Therefore, this study aimed to analyse the fatigue behaviour of a single-unit dental implant with two screws using a combination of the numerical results and the traditional fatigue criteria – a combination that was not yet fully and correctly explored. A finite element model comprising a single implant, one abutment, one abutment screw, one fixation screw and one prosthetic crown was developed. Material properties were assigned based on literature data. A 100 Nload was applied to mimic the mastication forces and fatigue analysis was conducted using the Gerber, Goodman and Soderberg fatigue criteria. The fatigue analysis demonstrated that the abutment screw could fail in less than 1 year, depending on the criteria, while the fixation screw exhibits an infinite life. The results illustrated the importance of analysing the fatigue behaviour of dental implants and highlighted the potential of finite element models to simulate the biomechanical behaviour of dental implants.

Published
2023
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30. Safety and Outcome of Revascularization Treatment in Patients With Acute Ischemic Stroke and COVID-19

Author

Marto, João Pedro, Strambo, Davide, Ntaios, George, Nguyen, Thanh N., Herzig, Roman, Czlonkowska, Anna, Demeestere, Jelle, Mansour, Ossama Yassin, Salerno, Alexander, Wegener, Susanne, Baumgartner, Philipp, Cereda, Carlo W., Bianco, Giovanni, Beyeler, Morin, Arnold, Marcel, Carrera, Emmanuel, Machi, Paolo, Altersberger, Valerian, Bonati, Leo, Gensicke, Henrik, Bolognese, Manuel, Peters, Nils, Wetzel, Stephan, Magriço, Marta, Ramos, João Nuno, Sargento-Freitas, João, Machado, Rita, Maia, Carolina, Machado, Egídio, Nunes, Ana Paiva, Ferreira, Patricia, Pinho e Melo, Teresa, Dias, Mariana Carvalho, Paula, André, Correia, Manuel Alberto, Castro, Pedro, Azevedo, Elsa, Albuquerque, Luís, Alves, José Nuno, Ferreira-Pinto, Joana, Meira, Torcato, Pereira, Liliana, Rodrigues, Miguel, Araujo, Andre Pinho, Rodrigues, Marta, Rocha, Mariana, Pereira-Fonseca, Ângelo, Ribeiro, Luís, Varela, Ricardo, Malheiro, Sofia, Cappellari, Manuel, Zivelonghi, Cecilia, Sajeva, Giulia, Zini, Andrea, Gentile, Mauro, Forlivesi, Stefano, Migliaccio, Ludovica, Sessa, Maria, La Gioia, Sara, Pezzini, Alessandro, Sangalli, Davide, Zedde, Marialuisa, Pascarella, Rosario, Ferrarese, Carlo, Beretta, Simone, Diamanti, Susanna, Schwarz, Ghil, Frisullo, Giovanni, Marcheselli, Simona, Seners, Pierre, Sabben, Candice, Escalard, Simon, Piotin, Michel, Maïer, Benjamin, Charbonnier, Guillaume, Vuillier, Fabrice, Legris, Loïc, Cuisenier, Pauline, Vodret, Francesca R., Marnat, Gaultier, Liegey, Jean-Sebastien, Sibon, Igor, Flottmann, Fabian, Broocks, Gabriel, Gloyer, Nils-Ole, Bohmann, Ferdinand O., Schaefer, Jan Hendrik, Nolte, Christian, Audebert, Heinrich J., Siebert, Eberhard, Sykora, Marek, Lang, Wilfried, Ferrari, Julia, Mayer-Suess, Lukas, Knoflach, Michael, Gizewski, Elke Ruth, Stolp, Jeffrey, Stolze, Lotte J., Coutinho, Jonathan M., Nederkoorn, Paul, van den Wijngaard, Ido, De Meris, Joke, Lemmens, Robin, De Raedt, Sylvie, Vandervorst, Fenne, Rutgers, Matthieu Pierre, Guilmot, Antoine, Dusart, Anne, Bellante, Flavio, Calleja-Castaño, Patricia, Ostos, Fernando, González-Ortega, Guillermo, Martín-Jiménez, Paloma, García-Madrona, Sebastian, Cruz-Culebras, Antonio, Vera, Rocio, Matute, Maria Consuelo, Fuentes, Blanca, Alonso-de-Leciñana, María, Rigual, Ricardo, Díez-Tejedor, Exuperio, Perez-Sanchez, Soledad, Montaner, Joan, Díaz-Otero, Fernando, Pérez-de-la-Ossa, Natalia, Flores-Pina, Belén, Muñoz-Narbona, Lucia, Chamorro, Angel, Rodríguez-Vázquez, Alejandro, Renú, Arturo, Ayo-Martin, Oscar, Hernández-Fernández, Francisco, Segura, Tomas, Tejada-Meza, Herbert, Sagarra-Mur, Daniel, Serrano-Ponz, Marta, Hlaing, Thant, See, Isaiah, Simister, Robert, Werring, David, Kristoffersen, Espen Saxhaug, Nordanstig, Annika, Jood, Katarina, Rentzos, Alexandros, Šimůnek, Libor, Krajíčková, Dagmar, Krajina, Antonín, Mikulik, Robert, Cviková, Martina, Vinklárek, Jan, Školoudík, David, Roubec, Martin, Hurtikova, Eva, Hrubý, Rostislav, Ostry, Svatopluk, Skoda, Ondrej, Pernicka, Marek, Jurak, Lubomir, Eichlová, Zuzana, Jíra, Martin, Kovar, Martin, Panský, Michal, Mencl, Pavel, Palouskova, Hana, Tomek, Aleš, Janský, Petr, Olšerová, Anna, Sramek, Martin, Havlicek, Roman, Malý, Petr, Trakal, Lukáš, Fiksa, Jan, Slovák, Matěj, Karlinski, Michal Adam, Nowak, Maciej, Sienkiewicz-Jarosz, Halina, Bochynska, Anna, Wrona, Pawel, Homa, Tomasz, Sawczynska, Katarzyna, Slowik, Agnieszka, Wlodarczyk, Ewa, Wiacek, Marcin, Tomaszewska-Lampart, Izabella, Sieczkowski, Bartosz, Bartosik-Psujek, Halina, Bilik, Marta, Bandzarewicz, Anna, Dorobek, Malgorzata, Zielinska-Turek, Justyna, Nowakowska-Kotas, Marta, Obara, Krystian, Urbanowski, Paweł, Budrewicz, Slawomir, Guziński, Maciej, Świtońska, Milena, Rutkowska, Iwona, Sobieszak-Skura, Paulina, Labuz-Roszak, Beata M., Debiec, Aleksander, Staszewski, Jacek, Stępień, Adam, Zwiernik, Jacek, Wasilewski, Grzegorz, Tiu, Cristina, Terecoasă, Elena Oana, Radu, Razvan Alexandru, Negrila, Anca, Dorobat, Bogdan, Panea, Cristina, Tiu, Vlad, Petrescu, Simona, Ozdemir, Atilla, Mahmoud, Mostafa, El-Samahy, Hussam, Abdelkhalek, Hazem, Al-Hashel, Jasem, Ismail, Ismail Ibrahim, Salmeen, Athari, Ghoreishi, Abdoreza, Sabetay, Sergiu Ionut, Gross, Hana, Klein, Piers, Abdalkader, Mohamad, Jabbour, Pascal, El Naamani, Kareem, Tjoumakaris, Stavropoula, Abbas, Rawad, Mohamed, Ghada A., Chebl, Alex, Min, Jiangyong, Hovingh, Majesta, Tsai, Jenney P., Khan, Muhib, Nalleballe, Krishna, Onteddu, Sanjeeva, Masoud, Hesham, Michael, Mina, Kaur, Navreet, Maali, Laith, Abraham, Michael G., Khandelwal, Priyank, Bach, Ivo, Ong, Melody, Babici, Denis, Khawaja, Ayaz M., Hakemi, Maryam, Rajamani, Kumar, Cano-Nigenda, Vanessa, Arauz, Antonio, Amaya, Pablo, Llanos, Natalia, Arango, Akemi, Vences, Miguel Ángel, Barrientos Guerra, Jose Dominguo, Caetano, Rayllene, Martins, Rodrigo Targa, Scollo, Sergio Daniel, Yalung, Patrick Matic, Nagendra, Shashank, Gaikwad, Abhijit, Seo, Kwon-Duk, Georgiopoulos, Georgios, Nogueira, Raul G., and Michel, Patrik

Published
2023
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31. Cross-sectional Study on Blood Pressure Control in the Department of Nephrology of the Escola Paulista de Medicina - UNIFESP

Author

Freitas João Batista de, Tavares Agostinho, Kohlmann Jr Osvaldo, Zanella Maria Tereza, and Ribeiro Artur Beltrame

Subjects
hypertension, blood pressure control, treatment, Diseases of the circulatory (Cardiovascular) system, RC666-701
Abstract

OBJECTIVE - To assess hypertension control rates in a specialized university-affiliated medical department, the influence of sex, diabetes, and obesity on that control, and the strategies for the treatment of hypertension. METHODS - We carried out a cross-sectional study with 1,210 patients followed up for at least 6 months. Information was gathered from medical and nursing records and comprised the following data: sex, age, weight, height, abdominal and hip circumferences, blood pressure, and class and number of the antihypertensive drugs prescribed. To assess obesity, we used body mass index and waist/hip ratio. Blood pressure was considered under control when its levels were below 140/90 mmHg. RESULTS - The study consisted of 73% females and 27% males. Most females (31.7%) were 50 to 59 years of age, and most males (28.3%) were 60 to 69 years. The blood pressure control rate found was 20.9% for the 1,210 patients and 23.4% for the hypertensive diabetic patients (n=290). Despite the low control rates found, 70% of the patients used 1 or 2 antihypertensive medications. A high prevalence of obesity (38%) was observed, and females had a greater abdominal obesity index than males did (90% vs 82%, p

Published
2002

32. Electrospun composite fibers of PLA/PLGA blends and mesoporous silica nanoparticles for the controlled release of gentamicin sulfate.

Author

Batista, Henrique, Freitas, João P., Abrunheiro, Alexandra, Gonçalves, Teresa, Gil, Maria H., Figueiredo, Margarida, and Coimbra, Patrícia

Subjects
*MESOPOROUS silica, *SILICA nanoparticles, *FIBROUS composites, *GENTAMICIN, *POLYMERIC composites, *POLYMER solutions, *SULFATES, *POLYMER blends
Abstract

With the objective of developing a localized gentamicin sulfate (GS) delivery system with a controlled release kinetics for the prevention/management of osteomyelitis, composite electrospun fibers composed of poly(lactic acid) (PLA) and poly(lactic-co-glycolic acid) (PLGA) blends and GS loaded mesoporous silica nanoparticles (npSiGS) were prepared (PLA/PLGA: 1:3, 1:1, 3:1 w/w). GS was loaded into silica nanoparticles by adsorption, using a concentrated GS solution, and npSiGS were dispersed in the polymer solutions and immobilized in the polymeric matrix by occlusion, during fibers formations. For comparison, non-composite fibers with the same blend compositions containing GS simply dispersed in the polymeric phase were also produced. GS loaded nanoparticles were characterized by nitrogen adsorption/desorption isotherms and GS loading was quantified by thermogravimetric analysis. The morphology of the electrospun fibers, assessed by SEM, revealed that npSiGS were embedded along the composite fibers, some in the form of small aggregates. In vitro release studies showed that composite fibers exhibited lower initial burst releases and slower release kinetics, dependent on blend composition. Composite fibers with PLGA as the major component (25PLA-npSiGS) had the fastest release kinetics, while fibers with equal amounts of both polymers (50PLA-npSiGS) or with PLGA as the minor component (75PLA-npSiGS) had slower release kinetics, with constant GS release rates after the first day. These results suggest that PLA/PLGA blend composition can be manipulated to obtain composite fibers with a controlled and tailored GS release for at least three weeks. Finally, the antibacterial effect against Staphylococcus aureus of all produced fibers containing GS was confirmed by a disk diffusion method. [ABSTRACT FROM AUTHOR]

Published
2022
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41. The alkyl chain length of 3-alkyl-3’,4’,5,7-tetrahydroxyflavones modulates effective inhibition of oxidative damage in biological systems: Illustration with LDL, red blood cells and human skin keratinocytes

Author

Filipe, Paulo, Silva, Artur M.S., Seixas, Raquel S.G.R., Pinto, Diana C.G.A., Santos, Alvaro, Patterson, Larry K., Silva, João N., Cavaleiro, José A.S., Freitas, João P., Mazière, Jean-Claude, Santus, René, and Morlière, Patrice

Published
2009
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42. The impact of the COVID-19 pandemic on acute coronary syndrome admissions to a tertiary care hospital in Portugal

Author

Calvão, João, Amador, Ana Filipa, Costa, Catarina Martins da, Araújo, Paulo Maia, Pinho, Teresa, Freitas, João, Amorim, Sandra, and Macedo, Filipe

Abstract

The coronavirus SARS-CoV-2 (COVID-19) pandemic has been an unmatched challenge to global healthcare. Although the majority of patients admitted with acute coronary syndrome (ACS) may not be infected with COVID-19, the quarantine and public health emergency measures may have affected this particular high risk group. The objective of this study is to assess the impact of the early period of the COVID-19 pandemic on ACS admissions and clinical course in a tertiary care hospital in Portugal's most affected region.

Published
2022
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43. Apolipoprotein E genotype does not influence the risk of symptomatic hemorrhage in acute ischemic stroke.

Author

Tábuas-Pereira, Miguel, Galego, Orlando, Almeida, Maria Rosário, Tomás, José, Félix-Morais, Ricardo, Silva, Fernando, Rodrigues, Bruno, Cordeiro, Gustavo, and Sargento-Freitas, João

Abstract

• Apolipoprotein E gene polymorphism ε4 is associated with lobar intracranial hemorrhages. • Apolipoprotein E gene polymorphism ε2 also predisposes to changes in the blood vessels and white matter changes. • We found no association between APOE polymorphisms and hemorrhagic transformation following thrombolysis. APOE ε4 is independently associated with lobar intracranial hemorrhages (ICH). Although the ε4 allele enhances amyloid deposition in blood vessels, the ε2 allele predisposes to vasculopathic changes leading to rupture of amyloid laden vessels. Thus, ε4 and ε2 carriers might have increased susceptibility to ICH. We aimed to study the impact of the apolipoprotein E alleles in the development of symptomatic ICH (sICH). We included 384 consecutive ischemic anterior circulation stroke patients submitted to thrombolysis between January 2014 and March 2016. Admission CT-scans were reviewed to calculate the ASPECTS. Patients were followed for up to at least 6 months post-stroke or until death. Outcome was development of sICH, defined according to the ECASS III. Considering APOE genotyping, three patients had ε2/ε2, four had ε2/ε4, 38 had ε2/ε3, 284 had ε3/ε3, 51 had ε3/ε4 and four had ε4/ε4. sICH was associated with sex and diabetes. In multivariate analysis, sICH was not associated with carrying one or more ε4 alleles (OR: 0.483, 95%CI = [0.059, 3.939], p = 0.497) nor with carrying one or more ε2 alleles (OR: 1.369, 95%CI = [0.278, 6.734], p = 0.699). No association was found between APOE genotype and the development of symptomatic intracranial hemorrhage. [ABSTRACT FROM AUTHOR]

Published
2021
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46. Novel and simplified optimisation pathway using response surface and design of experiments methodologies for dental implants based on the stress of the cortical bone

Author

Freitas, João PO, Agostinho Hernandez, Bruno, Gonçalves, Paulo J Paupitz, Baptista, Edmea C, and Capello Sousa, Edson A

Abstract

Dental implants are widely used as a long-term treatment solution for missing teeth. A titanium implant is inserted into the jawbone, acting as a replacement for the lost tooth root and can then support a denture, crown or bridge. This allows discreet and high-quality aesthetic and functional improvement, boosting patient confidence. The use of implants also restores normal functions such as speech and mastication. Once an implant is placed, the surrounding bone will fuse to the titanium in a process known as osseointegration. The success of osseointegration is dependent on stress distribution within the surrounding bone and thus implant geometry plays an important role in it. Optimisation analyses are used to identify the geometry which results in the most favourable stress distribution, but the traditional methodology is inefficient, requiring analysis of numerous models and parameter combinations to identify the optimal solution. A proposed improvement to the traditional methodology includes the use of Design of Experiments (DOE) together with Response Surface Methodology (RSM). This would allow for a well-reasoned combination of parameters to be proposed. This study aims to use DOE, RSM and finite element models to develop a simplified optimisation analysis method for dental implant design. Drawing on data and results from previous studies, two-dimensional finite element models of a single Branemark implant, a multi-unit abutment, two prosthetic screws, a prosthetic crown and a region of mandibular bone were built. A small number of combinations of implant diameter and length were set based on the DOE method to analyse the influence of geometry on stress distribution at the bone-implant interface. The results agreed with previous studies and indicated that implant length is the critical parameter in reducing stress on cortical bone. The proposed method represents a more efficient analysis of multiple geometrical combinations with reduced time and computational cost, using fewer than a third of the models required by the traditional methods. Further work should include the application of this methodology to optimisation analyses using three-dimensional finite element models.

Published
2021
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48. Optimizing prognosis in atrial fibrillation: A call to action in Portugal

Author

Ferreira, Jorge, António, Natália, Cortez-Dias, Nuno, Gonçalves, Luciana Ricca, Sargento-Freitas, João, von Hafe, Pedro, and Gil, Victor

Abstract

Atrial fibrillation (AF), the most common arrhythmia in the adult population worldwide, represents a significant burden in terms of cardiovascular mortality and morbidity and has repercussions on health economics. Oral anticoagulation (OAC) is key to stroke prevention in AF and, in recent years, results from landmark clinical trials of non-vitamin K oral anticoagulants (NOAC) have triggered a paradigm shift in thrombocardiology. Despite these advances, there is still a significant residual vascular risk associated with silent AF, bleeding, premature sudden death and heart failure.

Published
2021
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49. Non-vitamin K antagonist oral anticoagulation versus left atrial appendage occlusion for primary and secondary stroke prevention after cardioembolic stroke

Author

Paiva, Luís, Coelho, José, Barra, Sérgio, Costa, Marco, Sargento-Freitas, João, Cunha, Luís, and Gonçalves, Lino

Abstract

This study aimed to evaluate the performance of non-vitamin K antagonist oral anticoagulation (NOAC) in patients with previous stroke and non-valvular atrial fibrillation (AF) compared with left atrial appendage occlusion (LAAO) in primary and secondary stroke prevention settings.

Published
2021
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50. Rio, Cidade Inteligente? Mobilidade de políticas e políticas de mobilidade no contexto dos megaeventos.

Author

Freire-Medeiros, Bianca and Freitas, João

Abstract

Copyright of Intersecoes: Revista de Estudios Interdisciplinares is the property of Editora da Universidade do Estado do Rio de Janeiro (EdUERJ) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2020
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