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4th graders’ working on a functional context: generalization levels and influence of stimuli
(2018)In the last decades studies about the early algebra proposal have provided evidences of elementary students’ algebraic skills since early ages. Some of these studies (e.g. Blanton & Kaput, 2011) address algebra from a ... -
A aprendizagem dos conceitos de acontecimentos disjuntos e complementares com recurso ao Geogebra
(2019)Nesta comunicação, apresentamos os resultados de um estudo que visa compreender como alunos costarriquenhos do 10.º ano aprendem conceitos básicos de Probabilidade, no âmbito de uma experiência de ensino apoiada em tarefas ... -
A comparison of bio-inspired optimization methodologies applied to the tuning of industrial controllers
(2016-11-09)A comparison of different bio-inspired methods is presented for the problem of tuning the parameters of a PID industrial controller for second order plus time delay plants. The compared algorithms are representative of ... -
A DMC implementation for a binary distillation column: a MIMO approach
(2022-11)Distillation columns are essential equipment for many industries, they are in charge of separating liquid mixtures based on the volatility differences of their components. Traditional PID control techniques have proven not ... -
A few additional reasons why vertical jump height should not be used to predict leg power
(2023-02)Jump height continues to be widely used to predict power in humans. Individual progress is often monitored on the basis of estimated power, but prediction equations are based on group data. Objectives: to show that vertical ... -
A mobile application for improving the delivery process of notifications
(2021-01)At present, there are systems in charge of classifying and sending notifications to smart devices at different times. However, there are not many studies that demonstrate the effectiveness of these systems in real world ... -
A modeling methodology to evaluate the impact of temperature on Solar Home Systems for rural electrification
(2018)Solar Home Systems (SHS) have recently gained prominence as the most promising solution for increasing energy access in remote, off-grid communities. However, the higher than standard testing conditions (STC) temperatures ... -
A performance evaluation of several artificial neural networks for mapping speech spectrum parameters
(2020)In this work, we compare different neural network architectures, for the task of mapping spectral coefficients of noisy speech signals with those corresponding to natural speech. In previous works on the subject, fully-connected ... -
A risk-based methodology for defining the time of intentional controlled islanding
(2015-10-05)Power systems are operated close to their stability limits and this increases the probability of cascading outages leading to large-area blackouts. To mitigate these phenomena, intentional controlled islanding (ICI) has ... -
A simple methodology for estimating battery lifetimes in Solar Home System design
(2017)The proliferation of Solar Home Systems (SHS) in recent times hopes to provide an alleviating solution to the global problem of energy poverty. Battery is usually the most expensive but important part of an SHS; it is also ... -
A survey on 3D Perception for robot object manipulation tasks
(2019)Un sistema confiable de manipulación de objetos requiere de percepción sofisticada. Aspectos importantes de este sistema es ser capaz de detectar la forma, tamaño y pose de los objetos a manipular. Estas capacidades se ... -
A systematic literature review of methodologies used for the design of serious games. A comparative analysis
(2020-06-26)This article of systematic literature review presents the analysis of a series of methodological proposals, suggested for the design of educational video games. Nine different methodologies are analyzed. As part of the ... -
El acceso abierto a la información: una premisa indispensable para desarrollar la investigación en diversidad cultural y estudios regionales
(2013-06-28)En el año 1998 escribíamos que la información es fundamental para apoyar la investigación sobre la identidad cultural. Este texto incluía una propuesta para agilizar los procesos que permitirían un fácil acceso a la ... -
Actitudes de la población general en Costa Rica hacia las personas mayores como aprendices y usuarias TIC
(2022)En Costa Rica se pueden identificar varios factores básicos que dificultan el aprendizaje sobre las TIC y su uso en la vida cotidiana por parte de las Personas Adultas Mayores, entre ellos destaca apoyo inadecuado o ... -
El agua como bien económico
(2013-10-23)El umbral de la contaminación irreversible del agua, el aire y la tierra no es tan inminente en su contexto regional como lo son los problemas de los recursos de agua y tierra asociados con la rápida deforestación, ... -
Alert Signs of Dating Violence Among College Students: From the Perspective of Campus Services
(2020)College students represent a vulnerable group for dating violence (DV), as many of them might have few experiences on dating relationships; therefore, they might have limited resolution conflict skills. Researchers have ... -
Algunos aspectos relacionados con la variabilidad climática de los ciclones tropicales en el Pacífico tropical del este
(Memorias del Congreso Latinoamericano de Ciencias del Mar – XIV COLACMAR. Camboriú, Santa Catarina, Brasil. 30 de Octubre - 04 de Noviembre de 2011., 2011-11)Como uno de los objetivos del proyecto “Paleotempestology of the Caribbean Region: A Multi-proxy, Multi-site Study of the Spatial and Temporal Variability of Caribbean Hurricane Activity” (Proyecto IAI-CRN2050, I.P. Dr. ... -
Algunos detalles y hechos históricos de los albores de la Física en Costa Rica: Parte I
(1990)En el período precolombino hay indicios de que hubo un desarrollo científico acorde a las necesidades de la época. Durante la Colonia los pobladores de nuestro territorio le dieron más importancia a la artesanía. Con la ... -
Algunos detalles y hechos históricos de los albores de la Física en Costa Rica: Parte II
(1990)A mediados del siglo XVIII se tiene información documental confiable de que el costarricense Liendo y Goicoechea introdujo la Física Experimental en la Universidad de San Carlos en Guatemala. Su influencia en Costa Rica ... -
Alternativas tecnológicas para el tratamiento de metales pesados en lixiviados de los residuos sólidos en tiraderos descontrolados, con fines de sustentabilidad
(2015)De acuerdo a un estudio antecedente realizado de la caracterización de lixiviados por D. Manzur (2012), en el ex tiradero a cielo abierto de la col. SAHOP en Cd. Madero Tamaulipas México, sitio de estudio. Se encontraron ...