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    ABSTRACT: a b s t r a c t In this paper, an adaptive model for predicting hourly global, diffuse and direct solar irradiance is described. A dataset of measured air temperature, relative humidity, direct, diffuse and global horizontal irradiance for Jeddah site (Saudi Arabia) were used in this study. Several combinations have been pro-posed, and the best performance is obtained by using sunshine duration, air temperature and relative humidity as inputs of the developed adaptive a-model. A good agreement between measured and pre-dicted data is obtained. In fact, the correlation coefficient is more than 97% and the mean bias error is less than 0.8. A comparison between a Feed-Forward Neural Network (FFNN) and the adaptive proposed model is presented in order to demonstrate his performance.
    Energy Conversion and Management 01/2010; DOI:10.1016/j.enconman.2009.10.034
  • Ecole Nationale des Sciences de l'Informatique, 01/2010, Degree: PhD
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    ABSTRACT: In this work, we have studied transfer function of multimode optical fibers considering chromatic and modal dispersion in the local area network (LAN) context. The chromatic transfer function is explored with taking into account two wavelength used in optical LAN. We have investigated mode-depending parameters, namely, modal delay, modal attenuation and mode-coupling effects as a function of wavelength. We have reported that the number of excited mode groups depend strongly on spot radius beam when the fiber is excited with a Gaussian input beam. We have proved that, frequency response of silica optical fiber is comprised between 3 and 6 dBo for 850 and 1300 nm when chromatic and modal effect is considered.
    Wireless and Optical Communications Conference, 2009. WOCC 2009. 18th Annual; 06/2009

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11/2009; DOI:10.4304/jnw.4.9.855-865
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