Browsing by Author "Sandoval, Cristian"

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    Artificial Neural Network to Predict the Shear Strength of Grouted Walls
    (2023) Hung, Jeffrey; Banting, Bennett; Sandoval, Cristian; Cruz-Noguez, Carlos
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    Effectiveness of Virtual Reality in Occupational Therapy for Post-Stroke Adults: A Systematic Review
    (2024) Floriano Landim, Síbila; López, Roberto; Caris, Antonia; Castro, Constanza; Castillo, Ramon D; Avello Saez, Daniela Margot; Magnani Branco, Braulio Henrique; Valdés-Badilla, Pablo; Carmine, Florencia; Sandoval, Cristian; Vásquez, Edgar
    In recent years, there has been a growing use of technological advancements to enhance the rehabilitation of individuals who have suffered from cerebrovascular accidents. Virtual reality rehabilitation programs enable patients to engage in a customized therapy program while interacting with a computer-generated environment. Therefore, our goal was to investigate the effectiveness of virtual reality in occupational therapy for people’s rehabilitation after a cerebrovascular accident. Methods: We systematically searched databases (Pubmed/Medline, Scopus, Web of Science, and Science Direct) for randomized controlled trials published within the last 10 years. Studies involving adult stroke survivors undergoing virtual reality-based interventions aimed at improving upper-extremity motor function were included. The quality assessment followed PRISMA guidelines, with the risk of bias assessed using the Cochrane tool (version 6.4) and methodological quality evaluated using GRADEpro. Results: We selected sixteen studies that met the main criteria for the implementation of virtual reality technology. The interventions described in the articles focused mainly on the upper extremities and their fine motor skills. Conclusions: When used in conventional treatments to improve people’s motor and cognitive functions after a cerebrovascular accident, virtual reality emerges as a beneficial tool. Additionally, virtual reality encourages adherence to the interventional process of rehabilitation through occupational therapy.
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    Psychosocial Impact of Quarantines: A Systematic Review with Meta-Analysis
    (Multidisciplinary Digital Publishing Institute (MDPI), 2024) González González, Catarina Fabiola; Navarro, Marcelo; Helbig Soto, Fabiola María del Carmen; Braulio Henrique, Magnani Branco; Avello Sáez, Daniela Margot; Carmine, Florencia; Márquez Alvarez, Nicolas; Sandoval, Cristian; Landim, Síbila Floriano; Leiva Bianch, Marcelo
    Background: Quarantine is one of the most effective strategies to control outbreaks of communicable diseases. Individuals under isolation or quarantine experience both physical and mental effects. Therefore, given its widespread implementation around the world, it is pertinent to analyze this effect on physical and mental health. The psychosocial impact model, which divides four dimensions into two main points, exposure or protection and positive or negative responses, was used to analyze the psychosocial impact of quarantine. Objectives: The present study aimed to investigate the psychosocial impact of people exposed to or protected from quarantine. Methods: We conducted a search for primary articles in the Web of Science and Scopus databases, and after applying the inclusion and exclusion criteria, we meta-analyzed five of them. Results: Quarantined individuals were more likely to experience anxiety (K = 4; OR = 2.62) and depressive symptoms (K = 6; OR = 1.61) compared to those who did not undergo quarantine. Researchers discuss a twofold increase in the probability of anxiety or depression among those in quarantine. As a result, advancing interventions that reduce this impact is critical for both health and the global economy. Conclusions: In terms of economic variables, the non-moderation of GDP per capita and the moderation of the GINI index stand out, demonstrating that countries must move toward policies that promote the reconstruction of more resilient and inclusive societies.
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    Resistencia máxima a corte de muros de albañilería armada: predicción vs resultados experimentales
    (University of Cantabria - Building Technology R&D Group, 2014) Aguilar, Victor; Sandoval, Cristian; Valdebenito, Galo
    En Chile, gran parte del parque edificado se estructura en base a muros de corte de albañilería armada. Una parte significativa de estas construcciones presentó daño estructural post terremoto del 27 de febrero de 2010. Luego de un evento sísmico severo, la evaluación estructural de tales construcciones requiere un análisis suficientemente preciso que permita a los técnicos tomar medidas de actuación bien fundamentadas. Como parte de una investigación más amplia, el presente artículo investiga la precisión de una selección de expresiones de diseño actualmente disponibles para estimar la resistencia máxima al corte de muros de albañilería armada. Para ello, el trabajo compara la predicción de la resistencia máxima al corte empleando diferentes expresiones de diseño con un conjunto de resultados experimentales reportados en la literatura. La información experimental empleada en la presente investigación proviene de 22 fuentes diferentes e incluye ensayos experimentales sobre muros con unidades de ladrillo cerámico y bloque de hormigón, en condición de grout parcial y completo. Los resultados de la investigación muestran que las expresiones más precisas para la predicción de la resistencia máxima al corte son las propuestas de Matsumura (1987) y Tomazevic (1999), para albañilería de ladrillo cerámico y bloque de hormigón respectivamente.
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    Study of the influence of different parameters on the buckling behaviour of masonry walls
    (ELSEVIER SCI LTD, 2012) Sandoval, Cristian; Roca, Pere
    A study of the influence and interaction of the main parameters involved on the buckling behaviour of masonry walls subjected to vertical loading is presented. For this purpose, the effects of the variation of the slenderness ratio, the eccentricity of applied load, the stiffness of the wall and the tensile strength of the unit-mortar interface on the load bearing capacity of masonry walls are analyzed by means of a numerical model based on the micro-modelling approach.