Teun A. Van Dijk. <i>Estructuras y funciones del discurso</i>

Hylke van Dijk Democratic processing

02-Van Dijk-Ch02.qxd

Several concepts are available to indicate the type of society that evolves under the influence of the use of information and communication technology. The most popular concept is the information society. In this book that concept is used in combination with the concept network society to typify contemporary developed and modern societies marked by a high level of information exchange and use o...

Evaluación del clustering de páginas web mediante funciones de peso y combinación heurística de criterios

Web page clustering can help in the evaluation and search of the results of search engines, among other things. The different term weighting functions applied to the selected features to represent web pages is a main aspect in clustering task. In this paper, seven different term weighting functions are evaluated by means of the results of a partitioning clustering algorithm, with a reference we...

Método criptográfico simétrico utilizando teoría del caos, operaciones sobre ADN y raíces de funciones no lineales

In this work we propose an algorithm for symmetric cryptography based on chaotic functions, masking based on addition and subtraction on deoxyribonucleic acid and roots of nonlinear functions. The algorithm generates two keys; the first one is generated by the chaotic function and the second by the nonlinear function. The computational implementation of the algorithm realized in Octave allows t...

Funciones De Hermite, Derivación Fraccionaria Y Ciertas Familias De Operadores

In this paper, we study the connection between Weyl fractional calculus of the gaussian function and Hermite functions. This relationship appears in a natural way to treat integrated families. Some particular cases are considered. Es bien conocido ([Go], pág. 121) que el operador Laplaciano en R, ∆ = d 2 dx2 , es el generador infinitesimal en L(R) de una función coseno (C(t))t≥0 uniformemente a...