A digital signal processing system developed for the optimal use of high density magnetic storage media

High density data recording has traditionally been an essential factor in the development of communication and transmission systems. However, recently more sophisticated applications, including video recording, have necessitated refinements of this technology. This study concentrates on the signal processing techniques used to inhance the packing density of stored data. A comparison of the spectral mapping characteristics of different codes illustrates that the need for equalization can be eliminated and that significant bandwidth reduction can be achieved. Secondly, consideration is given to the deleterious effects of flutter, its associated effects on high density data recording, and the constraints imposed on the development of a time base corrector. An analysis is made of the bandlimiting effect which results when the incoming data is convolved with the head impulse response. The bandwidth of the channel, the size of the head gap, and the velocity of the media are seen from this analysis to be intrinsically related. These signal processing techniques are implemented, the channel capacity computed, and a significant channel efficiency achieved

Aprendizaje y fomento de los estereotipos de género en el juego y otros consumos culturales

Se aborda la literatura como actividad lúdica en la infancia y su estrecha relación con la identidad de género y la conformación de estereotipos. El papel de la educación a través de la motivación hacia la lectura en general y de la literatura en particular. Se enfatiza la importancia de la lectura desde una postura crítica en los infantes. El niño y la niña como constructores del conocimiento y de sí mismos, entre ello, su propia identidad, así como la importancia del papel del maestro y de los adultos como mediadores críticos ante la concepción del género. Finalmente se examinan los resultados considerando para ello, el análisis de cuentos infantiles clásicos que permitieron apreciar los significados y simbolismos de género, los cuales han fomentado los estereotipos que en su mayoría minimizan o discriminan los roles femeninos. Antes de llegar a las conclusiones se pueden hacen reflexiones profundas sobre el aprendizaje de dichos estereotipos en los y las niñas que no siempre llevan a finales felices.Es innegable el influjo de la literatura infantil, los juegos y otros consumos culturales infantiles en la conformación de la identidad de género y el aprendizaje de conductas y roles sociales tradicionalmente aceptados como masculinos y femeninos, razón por la cual en la presente investigación se propone analizar la influencia del juego y la literatura infantil clásica en el fomento de estereotipos de género en niños y niñas. Se analiza brevemente la infancia a través de una mirada hacia la evolución de dicho concepto y su relación con el juego, para ello, se realizó un recorrido histórico del juego y de los juguetes, considerando el papel fundamental de la literatura infantil, particularmente los cuentos clásicos, los cuales llevan implícitos roles ancestrales de género

A Case Study of the Development of a Career Academy: Good Intentions Not Enough?

The purpose of this study was to explore how a career academy featuring an information technology (IT) theme approached the adoption of the model and the particular curricular focus. We used a case study design to explore the experiences of school personnel and community partners associated with the implementation of the career academy. We found that growing enrollment in the local district was a major driver to pursue small school designs as an alternative to the traditional high school comprehensive model. The small school size associated with small learning communities was valued by stakeholders and used to adopt and implement a career academy around a technology curricular theme. Another factor in the adoption decision was the availability of existing building infrastructure in the community. While the premises of the career academy model appeared to be a good fit in the district and community, we also found that good intentions are not enough to guarantee consistent fidelity throughout the career academy implementation. When new crises arise, input from all stakeholders may be shortchanged and decisions can turn into a top-down approach

An R Package for a General Class of Inverse Gaussian Distributions

The inverse Gaussian distribution is a positively skewed probability model that has received great attention in the last 20 years. Recently, a family that generalizes this model called inverse Gaussian type distributions has been developed. The new R package named ig has been designed to analyze data from inverse Gaussian type distributions. This package contains basic probabilistic functions, lifetime indicators and a random number generator from this model. Also, parameter estimates and diagnostics analysis can be obtained using likelihood methods by means of this package. In addition, goodness-of-fit methods are implemented in order to detect the suitability of the model to the data. The capabilities and features of the ig package are illustrated using simulated and real data sets. Furthermore, some new results related to the inverse Gaussian type distribution are also obtained. Moreover, a simulation study is conducted for evaluating the estimation method implemented in the ig package