Congresos. Editorial UPV
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Congresos realizados en la UPV publicados por la Editorial Universitat Politècnica de València.
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Browsing Congresos. Editorial UPV by Sponsor "Agencia Nacional de Investigación y Desarrollo de Chile"
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- PublicationCambios espacio-temporales costeros con imágenes Landsat 8 y Sentinel 2 (2015-2019) en Chile Central; Playa Reñaca, Bahía de Concón y Bahía de Algarrobo(Editorial Universitat Politècnica de València, 2021-10-01) Briceño de Urbaneja, Idania; Sánchez-García, Elena; Pardo Pascual, Josep Eliseu; Palomar Vázquez, Jesús Manuel; Ugalde-Peralta, Raúl; Aguirre-Galaz, Catalina; Perez Martinez, Waldo; Vidal Páez, Paulina Javiera; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Grupo de Cartografía Geoambiental y Teledetección; Agencia Nacional de Investigación y Desarrollo de Chile[EN] Due to their oceanographic and climatic ecological characteristics, the coastal areas of the Valparaíso Region of Chile are of great importance for the country's tourist, economic, and environmental development. The region's coasts have been affected by extreme events since 2015, with recurrent swells that have increased between 10% and 25% compared to previous years, causing the interruption of the annual dynamic process of the beaches accentuated by anthropic interventions on beaches, wetlands and coastal dunes that promote coastal degradation. This work aims to characterize which part of the beaches and at what time of year there is a higher risk of severe erosion in the immediate areas to the coast and explain its causes based on satellite images of medium resolution satellite images. 128 SDS were extracted with Landsat 8 OLI and Sentinel 2 images with systems SHOREX. Average widths calculated for the series in each of the seasons. Recording the minimum widths in the proximal areas with averages of 12.3 m; 23.6 m and 21.2 m Concón Bay, Reñaca Beach and Algarrobo bay, respectively showing critical or problematic states. The dominant direction of the waves and the geographical disposition of the three beaches seems evident that there is a robust longitudinal transport to the north that generates less sediment accumulation in the proximal areas. The seasonal variation of the beaches distinguishes by more energetic conditions in winter than in summer. But they are also influenced by rapid episodic periods, low atmospheric pressure systems from the north and south, swells and tropical storms. Hence, it is unlikely that the variations in the width of the beach are only due to winter-summer energetic conditions.
- PublicationRobust estimation method for the economic subsidies to educational institutions in Chile(Editorial Universitat Politècnica de València, 2023-06-16) Ugalde, Valentina; Dávila-Gálvez, Sebastián; Vásquez, Óscar; Agencia Nacional de Investigación y Desarrollo de Chile; Ministerio de Educación, Chile[EN] In Chile, the Ministry of Education of Chile (MINEDUC) provides resources to the various educational institutions in the country based on a budget estimation model, where the "attendance of students" is the main component to be considered by annual economic subsidies. In the process, this estimation must be computed in the middle of the year, and therefore, the reduction of the impact of error in the estimation face to uncertainty is a desirable goal. In this work, we propose an easy-to-implemented robust estimation method, which is based on the formulation, implementation, and integration of a set of mathematical models that target the minimization of the maximum estimation error. The obtained results show that the proposal obtains a better estimation than the current MINEDUC estimation model, providing an efficient alternative of robust estimation method for the decision makers in the process, exposing insights to be considered in the future.
- PublicationWhen a test-taking strategy is better? An approach from the paradigm of scheduling under explorable uncertainty(Editorial Universitat Politècnica de València, 2023-06-16) Mauricio, Cristóbal Alfredo; Davila-Gálvez, Sebastián; Vasquez, Óscar Carlos; Agencia Nacional de Investigación y Desarrollo de Chile; Fondo Nacional de Desarrollo Científico y Tecnológico, Chile[EN] In this article, we adopt the paradigm of scheduling under explorable uncertainty to explore test-taking strategies to solve standardized tests in terms of maximizing the correct questions answered. From this approach, a test taker considers a number of questions and has the possibility to read in order to obtain the difficulty of the question. Later, he/she has the option, for example, to answer the question or to skip the one that seemed difficult and read the next question in the test. Specifically, we state the problem definition by considering two test-taking strategies, formulate and implement a mathematical model, and generate computational experiments in order to determine the dominance of one strategy over another. The results show that the dominance depends directly on the design of the test and the maximum time to perform it, so knowing these parameters allow us to provide algorithmic insights to address this problem.