Data base management evolved during the sixties and seventies. The evolution period was protracted. Many driving forces impacted the evolution and it is the aim of this paper to analyze these driving forces (some technical and some political) and to…

This paper shows models of data description that incorporate uncertainty like models of data extension EER, IFO among others. These database modeling tools are compared with the pattern FuzzyEER proposed by us, which is an extension of the EER model…

In cases of extremely imbalanced dataset with high dimensions, standard machine learning techniques tend to be overwhelmed by the large classes. This paper rebalances skewed datasets by compressing the majority class. This approach combines Vector Quantization and Support Vector Machine…

Se presentan los datos de recolecta de cuatro nuevos registros de arañas para el estado de Guanajuato: Argiope argentata (Fabricius 1775), Castianeira dorsata (Banks 1898), C. plorans (O.P.Cambridge 1898) y Selenops gracilis Muma 1953. Adicionalmente, se proporcionan algunos datos de…

The application of ANNs (Artifi cial Neural Networks) has been studied by many researchers in modelling rainfall runoff processes. However, the work so far has been focused on the rainfall data from traditional raingauges. Weather radar is a modern technology…

This paper studies two analogous mechanisms: equity and reciprocity, from a bridge, or translational, research perspective. The characteristics of this perspective are described, as well as the overall strategies of laboratory and field research for studying these mechanisms and their…

En las últimas décadas, el contagio por VIH y el SIDA han sido temas preponderantes de preocupación e investigación a nivel mundial. A pesar de los diversos esfuerzos multidisciplinarios, el contagio sigue avanzando de manera alarmante; hasta el momento, se…

Los almacenes de datos deben homogeneizar e integrar la información de las diversas áreas de una organización con el fin de extraer conocimiento relevante para la toma de decisiones. Su desarrollo no es tarea fácil, por lo cual se han…

Presentamos una estrategia para acelerar la simulación y visualización de mezclado advectivo--difusivo de un contaminante dentro de una cavidad cuadrada con condiciones de frontera dependientes del tiempo. No se requieren paredes móviles para mezclar el fluido sino la convección natural…

A methodology was developed for analysing faults in distribution transformers using the statistical package for social sciences (SPSS); it consisted of organising and creating of database regarding failed equipment, incorporating such data into the processing programme and converting all the…