El objetivo de este trabajo fue doble, por un lado, examinar el papel de los implantes cocleares sobre las capacidades de procesamiento fonológico de escolares sordos y su relación con el nivel de lectura, y por otro, analizar las estrategias de lectura empleadas por estos alumnos. La hipótesis principal era que estos lectores utilizan una estrategia de palabras clave, que consiste en identificar algunas de las palabras de cada frase y elaborar su significado global a partir de ellas. Los participantes eran 71 alumnos sordos profundos y prelocutivos y 326 oyentes, de Educación Primaria y Secundaria. Sus habilidades lectoras, fonológicas y ortográficas fueron evaluadas. Los resultados muestran que el nivel de lectura es más elevado en los oyentes que en los sordos y que los implantados son superiores a los no implantados. En cada grupo el nivel lector dependía de las habilidades metafonológicas de los participantes. Observamos también que la estrategia de palabras clave es generalmente empleada por los lectores sordos. Finalmente, la edad de colocación del implante así como su duración fueron determinantes del nivel lector y de las habilidades metafonológicas. Estos resultados apoyan la idea de que los implantes cocleares, especialmente cuando tienen lugar a una edad temprana, favorecen el desarrollo de representaciones fonológicas y dan lugar a mejores resultados en lengua escrita.
A suspended particle device is made by electrophoretic rod-shape particles suspended in an organic gel. These particles can twist and order with an applied voltage. The light crossing the material suffers more or less scattering according to that voltage. A commercial device is analyzed in this work. Several electrical models are tested, being the best one a series configuration including a shunt double layer capacitance and a Warburg element. Main parameter errors are below 2%, showing the quality of this new electrical model for this kind of devices. A quick method to improve the manufacturing process on-line is also proposed. Impedance measurements will be fitted to the selected electrical model, in order to check physical aspects such as charge diffusion lengths and response times. An electronic driver to obtain several levels of device transmission has been also developed, being its linearity demonstrated too. Colour changes are negligible for the main part of the bleaching process. All these features allow the use of this set in domotics application.
A flexible and fast synthesis method for designing asymmetric interleavers with flat-top, low dispersion, adjustable isolation, and bandwidths at both outputs is proposed. Interleavers are designed on birefringent technology allowing linear-phase designs. Z -transform properties and digital filter design techniques are used for designing interleavers under a set of specifications. At a second level, a genetic algorithm optimization approach allows improving the interleaver design adjusting the minimum isolation, at both outputs, below À43 dB and the stop bandwidths to specific normalized values of AE0.15 and AE0.3, with zero dispersion at one output. Improvement of the interleaver order and dispersion below AE50 ps/nm at both outputs are also reported.
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