Latin American Journal of Computing
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User Experience for Disabled Users in Open Educational Resources Websites
Get PDFOpen Educational Resources (OER) are digital materials for teaching-learning purpose released under an open license that are available through websites. In the last decade, some governments have encouraged the development and using of OER in order to contribute to the achievement of the right to education for everyone, a fundamental right included in The Universal Declaration of Human Rights. Besides, inclusion of people with disabilities is a global concern that need to be addressed in all living aspects including education.In this research we address the user experience in OER websites —considering the perspective of users with disabilities— in order to recognize possible barriers in web design. The conformance criteria considered for this reviewing are mandatory aspects of user experience in relation to Web accessibility and Web usability.
 
Propuesta de un Modelo de Planificación y Organización para Implementación de Centros de Servicios tecnológicos en Instituciones Educativas Públicas
No full textTIC provides the opportunity to expand access to education, to strengthen digital education, and to raise the quality of education, to allowing teaching and learning are ongoing, everyday process. However effectively integrate TIC in education is a complex process involving review of curriculum and pedagogy, teaching skills and financing.
In Ecuador experienced us a technological advance, particularly for access to information and communication. In the last decade the extent of the Internet allows TIC reach their highest popularity this without even enough.
In order to reduce the lack of TIC mainly in the school-age population propose a logical design model for the Technology Services Center (TCS) approach would aim to provide technological benefits to student population.Las TIC brindan la oportunidad de expandir el acceso a la educación, fortalecer la educación digital, y elevar la calidad educativa, permitiendo que la enseñanza y el aprendizaje sean un proceso continuo y cotidiano. No obstante integrar efectivamente las TIC en el sistema educativo es un proceso complejo que implica revisión del currículo y pedagogía, las competencias docentes y el financiamiento.
En Ecuador se experimenta un avance tecnológico, principalmente por el acceso a la información y comunicación. En la última década la extensión de la Internet permite que las TIC alcancen su mayor popularidad hasta el presente sin ser aún suficiente.
Con el fin de reducir el desconocimiento de las TIC principalmente en la población en edad escolar se plantea un modelo en el que se estructura un enfoque lógico para el diseño de Centros de Servicios Tecnológicos (CST) que tendrían como objetivo proporcionar beneficios tecnológicos a población estudiantil
3D Sound applied to the design of Assisted Navigation Devices for the Visually Impaired
Get PDFThis work presents an approach to generate 3D sound by using a set of artificial neural networks (ANNs). The proposed method is capable to reconstruct the Head Related Impulse Responses (HRIRs) by means of spatial interpolation. In order to cover the whole reception auditory space, without increasing the network complexity, a structure of multiple networks (set), each one modeling a specific area was adopted. The three main factors that influence the model accuracy --- the network\u27s architecture, the reception area\u27s aperture angles and the HRIR\u27s time shifts --- are investigated and an optimal setup is presented. The computational effort to process the ANN is shown to be slightly smaller than traditional interpolation methods and all error calculation reached very low levels, validating the method to be used in the design of a 3D sound emitter capable of provide navigation aid for the visually impaired. Two approaches are presented in order to detect obstacles, one which makes use of computational vision techniques and other with laser proximity sensors. Este trabajo presenta un abordaje para generar sonido 3D utilizando un conjunto de redes neuronales artificiales (RNAs). El método propuesto es capaz de reconstruir la Respuestas Impulsivas Asociadas a Cabeza Humana (HRIRs) mediante interpolación espacial. Con el fin de cubrir todo el espacio de recepción auditivo, sin aumentar la complejidad de la red, fue adoptada una estructura de múltiples redes (conjunto), cada una modelando un área específica. Los tres factores principales que influyen en la exactitud del modelo --- la arquitectura de la red, ángulos de apertura de la zona de recepción y los cambios de tiempo del HRIR --- son investigados y es presentada una configuración óptima. El esfuerzo computacional necesario para procesar la RNA muestra ser menor que métodos tradicionales de interpolación y todos los cálculos de error alcanzan niveles muy bajos, validando el método para ser utilizado en el diseño de un emisor de sonido 3D capaz de proporcionar asistencia en la navegación de discapacitados visuales. Dos enfoques se presentan con el fin de detectar obstáculos, uno que hace uso de técnicas de visión computacional y otro con sensores de proximidad de láser. 
Importancia de Accesibilidad Web en Mapas Geográficos para la Educación
Get PDFEste estudio presenta un análisis de las Pautas de Accesibilidad para el Contenido Web (WCAG 2.0) que pueden ayudar a mejorar la accesibilidad en los mapas geográficos, esto permite a estudiantes que tienen algún problema de discapacidad visual acceder al contenido geográfico. Para realizar este análisis se ha realizado un estudio del estado de arte de trabajos que aportan a esta investigación, además se presentan ciertas soluciones prácticas y herramientas que deben considerarse como es el uso de los Gráficos Vectoriales Redimensionables (SVG), el Lenguaje de Marcas de Hipertexto versión 5 (HTML 5) y las Hojas de Estilo en Cascada (CSS). También se presentan algunas recomendaciones para mejorar la accesibilidad web en los mapas geográficos y se proponen algunos trabajos a futuro
Hierarchical Path Finding to Speed Up Crowd Simulation
Get PDFPath finding is a common problem in computer games. Most videogames require to simulate thousands or millions of agents who interact and navigate in a 3D world showing capabilities such as chasing, seeking or intercepting other agents. A new hierarchical path finding solution is proposed for large environments. Thus, a navigation mesh as abstract data structure is used in order to divide the 3D world. Then, a hierarchy of graphs is built to perform faster path finding calculations than a common A*. The benefits of this new approach are demonstrated on large world models
Modeling the Performance of MapReduce Applications for the Cloud
Get PDFIn the last years, Cloud Computing has become a key technology that made possible to run applications without needing to deploy a physical infrastructure. The challenge with deploying distributed applications in Cloud Computing environments is that the virtual machine infrastructure should be planned in a time and cost-effective way.This work is a summary of a previous work presented by the authors as a Master’s thesis, with the goal of showing that the execution time of a distributed MapReduce application, running in a Cloud computing environment, can be predicted using a mathematical model based on theoretical specifications. This prediction is made to help the users of the Cloud Computing environment to plan their deployments, i.e., quantify the number of virtual machines and its characteristics. After measuring the application execution time and varying parameters stated in the mathematical model, and after that, using a linear regression technique, the goal is achieved finding a model of the execution time which was then applied to predict the execution time of MapReduce applications. Experiments were conducted in several configurations and showed a clear relation with the theoretical model, revealing that the model is in fact able to predict the execution time of MapReduce applications. The developed model is generic, meaning that it uses theoretical abstractions for the computing capacity of the environment and the computing cost of the MapReduce application.
En los últimos años, Cloud Computing se ha convertido en una tecnología clave que ha hecho posible ejecutar aplicaciones sin la necesidad de utilizar una infraestructura física. El desafío de implementar aplicaciones distribuidas en ambientes de Cloud Computing es que la infraestructura de máquinas virtuales debe considerar aspectos relacionados con el costo y el tiempo de utilización. Este trabajo es el resumen de uno anterior, presentado por los autores como tesis de maestría, con el objetivo de demostrar que el tiempo de ejecución de una aplicación distribuida MapReduce, ejecutándose en un ambiente de Cloud Computing, puede ser predicho utilizando un modelo matemático basado en especificaciones teóricas. Esta predicción se realiza para ayudar a los usuarios de un ambiente de Cloud Computing a planificar sus implementaciones, es decir, cuantificar el número de máquinas virtuales y sus características.Después de medir el tiempo de ejecución de las aplicaciones y variando los parámetros establecidos por el modelo matemático, y seguidamente usando una técnica de regresión lineal, el objetivo se alcanza al encontrar un modelo del tiempo de ejecución que fue posteriormente aplicado para aplicaciones MapReduce. Los experimentos fueron realizados en diferentes configuraciones y mostraron una clara relación con el modelo teórico, mostrando así que el modelo es capaz de predecir el tiempo de ejecución de aplicaciones MapReduce. El modelo desarrollado es genérico, es decir que usa abstracciones teóricas para la capacidad de cómputo del ambiente y el costo computacional de la aplicacin MapReduce
Qualitative Assessment of User Acceptance within Action Design Research and Action Research: Two Case Studies
Get PDFNowadays, there are several models to evaluate technological acceptance of software developed through Action Design Research and Action Research. These models rely on quantitative techniques to study user behavioural intentions and thus predict the use of a technology. This paper presents our experiences in using qualitative methods to assess such acceptance in the development of specialized tools for Strategic Scanning. Our study suggests that qualitative methods can be an alternative to evaluate technology acceptance in situations where the number of users is small or where there are requirements for continuous improvement
Personalized Medical Alert System
No full textThe continuous increasing needs in telemedicine and healthcare, accentuate the need of well-adapted medical alert systems. Such alert systems may be used by a variety of patients and medical actors, and should allow monitoring a wide range of medical variables. This paper proposes Tempas, a personalized temporal alert system. It facilitates customized alert configuration by using linguistic trends. The trend detection algorithm is based on data normalization, time series segmentation, and segment classification. It improves state of the art by treating irregular and regular time series in an appropriate way, thanks to the introduction of an observation variable valid time. Alert detection is enriched with quality and applicability measures. They allow a personalized tuning of the system to help reducing false negatives and false positives alerts
Using Software Product Line to improve ERP Engineering: Literature Review and Analysis
Get PDFOn the one hand, getting advantages of Enterprise Resource Planning (ERP) systems largely depends on their capacity to be configured and adapted to fit the customer and domain requirements. On the other hand, product line engineering (PLE) is a promising approach for configuring and adapting products by means of configuration and derivation processes. While the literature and industrial experiences show the benefits of PLE methods, techniques and tools, there is still a lack of interest in addressing ERP engineering issues with the product line strategy. Objective: The aim of this paper is to identify and analyze the different ways presented in the literature to improve ERP engineering issues with the methods, techniques and tools provided by PLE. Method: To achieve that objective, we reviewed the literature and analyzed available publications. Results: This literature review analyzes six research papers at the intersection between ERP and PLE. It shows that the product line strategy can indeed be applied for ERP configuration and customization. It further shows the evolving interest on this topic and discusses existing contributions
Rate Based Synchronous Diffusion Algorithm
No full textSensor networks applications often require global time synchronization between numerous sensors. In this paper we implemented the Rate-Based Synchronous Diffusion Algorithm as described in [RE1] on TelosB mote with Contiki. We report the development procedure and the results obtained on the TARWIS testbed from the University of Bern 1, Switzerland