José Federico Ramírez-Cruz

Learn More
This paper presents a wavelet neural-network for learning and approximation of chaotic time series. Wavelet networks are a class of neural network that take advantage of good localization and approximation properties of multiresolution analysis. These networks use wavelets as activation functions in the hidden layer and a hierarchical method is used for(More)
In this paper we present a bimodal biometric system for cryptographic key generation that works with speech and electrocardiogram (ECG) signals using wavelet transforms. This work is based on the uniqueness and quasi-stationary behavior of ECG and speech signals with respect to an individual. The architecture of the proposed system considers three security(More)
Name disambiguation is a focal point on realworld information integration, analysis, and data mining. This problem, also known as the classical name authority control problem, consists in "same authors with different spellings" or "different authors with the same spelling". The problem is augmented in large data repositories where information changes and(More)
We present a hybrid method to produce a velocity model of the Earth’s crust using evolutionary and seismic tomography algorithms. This method takes advantage of the global search ability of an evolution strategy and the quick convergence of an iterative three-dimensional seismic tomography technique to generate a model of the Earth’s crustal structure from(More)
Resumen. La apendicitis aguda es una enfermedad de dif́ıcil diagnostico en ancianos y niños, en la mayoŕıa de los casos se presenta un dolor en el ombligo que aumenta conforme al tiempo y se dirige hacia el cuadrante inferior derecho. Por su diversidad sintomatológica, existen propuestas de diagnóstico que se limitan a unos cuantos śıntomas, signos y(More)
Resumen. En este trabajo se realiza la paralelización sobre una Unidad de Procesamiento de Gráficos de la función de evaluación de una Evolución Diferencial (ED) que tiene como objetivo generar un modelo inicial de velocidades sísmicas en un volumen de la corteza terrestre. La función de evaluación incluye un algoritmo que traza los rayos sísmicos generados(More)
  • 1