Now showing items 1-10 of 60
A comparison of bio-inspired optimization methodologies applied to the tuning of industrial controllers
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 ...
Learning principles in program visualizations: a systematic literature review
Program visualizations help students understand the runtime behavior of other programs. They are educational tools to complement lectures or replace inefficient static drawings. A recent survey found 46 program ...
Mobile internet tariff models: technical or political decisions? A Costa Rican case study
We focus on the discussion about the proposal of shifting to a post paid mobile Internet tariff model based on usage, and its impact on universal use and service access for the poor sectors of the country. This proposal ...
Supporting User Awareness Using Smart Device-Based Notifications
This paper provides an overview of a doctoral research project which focuses in developing a framework to allow smart device-based notifications to provide user awareness. Notifications are mechanisms by which the user’s ...
Application of GQM+Strategies in a Multi-industry State-Owned Company
Technological applications have an increasingly important role in most companies. Investment in Information Technologies (IT) is also growing in most of them. The need to align IT-related goals with the company’s strategic ...
Ubiquitous Notification Mechanism to Provide User Awareness
Awareness could be defined as the knowledge that the user has of a particular activity, either individual or collaborative. Good awareness mechanisms provide information to the user at the right time so that s/he can know ...
Estudio de la cinética de cambio del color de café tostado usando análisis de imágenes en IMAGEJ
Color kinetics for roasted coffee using image analysis IMAGEJ
Se estudió el nivel de color usando la escala L*, a* y b* para grano tostado de café (Coffea arábica), preparada para masas iniciales de 500 g con humedad inicial de 12,5 % b.h.. Se utilizó un tostador tipo convencional, ...
Uso del sensor infrarrojo en el monitoreo del enfriamiento del café recién tostado
Infrared sensor used for the capture of data from cooling process in roasted coffee
El enfriamiento del café es una etapa esencial en el tueste de los granos, debe realizarse inmediatamente para detener las reacciones químicas y evitar el tueste excesivo. El objetivo del trabajo fue monitorear el proceso ...
Estimation of Lost Voltage Measurements in Distribution Networks
Estimación de medicines de tensión perdidas en redes de distribución
This paper presents an algorithm to estimate lost bus voltage measurements in balanced distribution networks regulated by centralized control schemes. The objective is to feed controllers with reliable estimations of lost ...
A risk-based methodology for defining the time of intentional controlled islanding
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 ...