Publications by authors named "Alfonso-Morales W"

Article Synopsis
  • Understanding rainfall patterns is crucial for water management, risk management, and agriculture in regions like Southwestern Colombia.
  • The study validated four techniques to identify homogeneous rainfall regions, using monthly rainfall data from Nariño, a complex area.
  • Findings indicated that non-linear methods, especially principal component analysis and self-organizing maps, were most effective, revealing distinct rainfall regimes in the Andean (bimodal) and Pacific (unimodal) regions.
View Article and Find Full Text PDF
Article Synopsis
  • Researchers and decision-makers are increasingly concerned about climate change and its impact, particularly regarding extreme rainfall events.
  • The study analyzes 12 climate indices of extreme rainfall from 1969 to 2019 in Cali, Colombia, using a methodology to address missing data through a Non-Linear Principal Component Analysis, ensuring better accuracy in the results.
  • The resulting database is a valuable resource for future studies on extreme rainfall, given Cali's significant urban population and the potential implications of these climate changes.
View Article and Find Full Text PDF

The Advanced Metering Infrastructure (AMI) data represent a source of information in real time not only about electricity consumption but also as an indicator of other social, demographic, and economic dynamics within a city. This paper presents a Data Analytics/Big Data framework applied to AMI data as a tool to leverage the potential of this data within the applications in a Smart City. The framework includes three fundamental aspects.

View Article and Find Full Text PDF

This paper presents the implementation of nonlinear canonical correlation analysis (NLCCA) approach to detect steady-state visual evoked potentials (SSVEP) quickly. The need for the fast recognition of proper stimulus to help end an SSVEP task in a BCI system is justified due to the flickering external stimulus exposure that causes users to start to feel fatigued. Measuring the accuracy and exposure time can be carried out through the information transfer rate-ITR, which is defined as a relationship between the precision, the number of stimuli, and the required time to obtain a result.

View Article and Find Full Text PDF

In recent years, there has been a transformation in the value chain of different industrial sectors, like the electricity networks, with the appearance of smart grids. Currently, the underlying knowledge in raw data coming from numerous devices can mark a significant competitive advantage for utilities. It is the case of the Advanced Metering Infrastructure (AMI).

View Article and Find Full Text PDF

This paper presents a new, to the best of our knowledge, methodology for the thermal compensation of background heating in thermograms of composites. The technique analyzes the spatial data of the thermal images obtained from a pulsed thermography inspection and automatically calculates the optimal parameters of a predefined objective function. These parameters are obtained by curve fitting using the least squares method and model the temperature distribution of the image background using the proposed objective function.

View Article and Find Full Text PDF

The success of many projects linked to the management and planning of water resources depends mainly on the quality of the climatic and hydrological data that is provided. Nevertheless, the missing data are frequently found in hydroclimatic variables due to measuring instrument failures, observation recording errors, meteorological extremes, and the challenges associated with accessing measurement areas. Hence, it is necessary to apply an appropriate fill of missing data before any analysis.

View Article and Find Full Text PDF