En estos últimos meses se ha incorporado de forma natural a los sistemas de reproducción sonora l... more En estos últimos meses se ha incorporado de forma natural a los sistemas de reproducción sonora los altavoces planos de modos distribuidos, que generan el campo acústico mediante la vibración de una superficie rectangular. La manera de colocar estos elementos es diversa: pueden colocarse como altavoces de techo, únicamente apoyados sobre los montantes, pueden colocarse verticalmente, apoyados en la pared
Due to the critical nature of the tasks in hard real-time systems, it is essential that faults be... more Due to the critical nature of the tasks in hard real-time systems, it is essential that faults be tolerated. In this paper, we present a scheme which can be used to tolerate faults during the execution of preemptive real-time tasks. We describe a recovery scheme which can be used to re-execute tasks in the event of single and multiple transient faults and discuss conditions that must be met by any such recovery scheme. We then extend the original Rate Monotonic Scheduling (RMS) scheme and the exact characterization of RMS to provide tolerance for single and multiple transient faults. We derive schedulability bounds for sets of real-time tasks given the desired level of fault tolerance for each task or subset of tasks. Finally, we analyze and compare those bounds with existing bounds for non-fault-tolerant and other variations of RMS.
Excess thyroid hormone at an early stage of development produces marked neurochemical and morphol... more Excess thyroid hormone at an early stage of development produces marked neurochemical and morphological alterations in the rat hippocampal formation. In order to better understand the functional significance of these changes, we tested adult rats treated neonatally with triiodothyronine (T3), and their control litter mates, in a spatial learning task and for the induction of longterm potentiation (LTP) in the dentate gyrus (DG) of the hippocampal formation. The T3-treated rats were significantly impaired in their performance on the spatial task in comparison to their matched controls. Similarly, the efficacy of LTP induction was significantly attenuated in the T3-treated animals. Further, a significant correlation was obtained between LTP induction and performance on the spatial learning task. Thus, a brief neonatal excess of thyroid hormone produces impairments in spatial learning along with decreases in LTP, long held as a model of learning and memory. This relationship provides a unique opportunity to study associations between behavioral, physiological, pharmacological and morphological processes intimately associated with the hippocampal formation
Among three animal fats evaluated, chicken fat (CF) has close similarity in fatty acid profiles w... more Among three animal fats evaluated, chicken fat (CF) has close similarity in fatty acid profiles with cod liver oil (CLO), compared with mutton fat and beef fat; therefore, CF can be one of the potential adulterants in CLO. Fourier transform infrared (FTIR) spectra of CLO, CF, and their mixtures were measured on direct contact with horizontal attenuated total reflectance (HATR) in mid infrared region (4000–650 cm−1) at 32 scanning and 4 cm−1 resolution. The chemometrics of partial least square (PLS) and discriminant analysis (DA) were chosen for the quantification and classification of oil adulterant in CLO. The results showed that FTIR spectroscopy coupled with PLS calibration can predict the level of CF in CLO with coefficient of determination (R2) for the relationship between actual and FTIR predicted value of CF in CLO is 0.996. The root means square errors of calibration (RMSEC) and prediction (RMSEP) obtained using seven principal components (PCs) are 0.346 and 0.513, respectively. DA using the Coomanss plot can classify pure CLO and that adulterated with CF accurately. Besides, DA using 10 PCs can be successfully exploited for the classification of CLO and CLO adulterated with the mixture of animal fats.Entre tres grasas animales evaluadas, la grasa de pollo (CF) mostró una gran semejanza en perfiles de ácidos grasos con aceite de hígado de bacalao (CLO), comparado con grasa de cordero y grasa de buey; la grasa de pollo puede ser uno de los posibles adulterantes de aceite de hígado de bacalao. Espectros FTIR de aceite de hígado de bacalao, grasa de pollo y sus mezclas se midieron en contacto directo con la reflectancia total atenuada horizontal en la región media de infrarrojos (4000 – 650 cm−1) a 32 barridos y resolución de 4 cm−1. Las quimometrías de cuadrados mínimos parciales (PLS) y análisis discriminante (DA) se eligieron para la cuantificación y clasificación de aceite adulterante en aceite de hígado de bacalao. Los resultados mostraron que la espectroscopia FTIR asociada con la calibración de cuadrados mínimos parciales puede predecir el nivel de grasa de pollo en aceite de hígado de bacalao con coeficiente de determinación (R2) para la relación entre valores de reales y FTIR predichos de grasa de pollo en aceite de hígado de bacalao es 0,996. La raíz media cuadrada de errores estándar de calibración (RMSEC) y predicción (RMSEP) obtenidos usando 7 componentes principales (PCs) son 0,346 y 0,513, respectivamente. El análisis discriminante usando el gráfico de Coomans puede clasificar aceite de hígado de bacalao puro y aquél adulterado con CF de una forma precisa. Además, el análisis discriminante usando 10 componentes principales puede ser aprovechado con éxito para la clasificación de aceite de hígado de bacalao y aceite de hígado de bacalao adulterado con la mezcla de grasas animales.
En estos últimos meses se ha incorporado de forma natural a los sistemas de reproducción sonora l... more En estos últimos meses se ha incorporado de forma natural a los sistemas de reproducción sonora los altavoces planos de modos distribuidos, que generan el campo acústico mediante la vibración de una superficie rectangular. La manera de colocar estos elementos es diversa: pueden colocarse como altavoces de techo, únicamente apoyados sobre los montantes, pueden colocarse verticalmente, apoyados en la pared
Due to the critical nature of the tasks in hard real-time systems, it is essential that faults be... more Due to the critical nature of the tasks in hard real-time systems, it is essential that faults be tolerated. In this paper, we present a scheme which can be used to tolerate faults during the execution of preemptive real-time tasks. We describe a recovery scheme which can be used to re-execute tasks in the event of single and multiple transient faults and discuss conditions that must be met by any such recovery scheme. We then extend the original Rate Monotonic Scheduling (RMS) scheme and the exact characterization of RMS to provide tolerance for single and multiple transient faults. We derive schedulability bounds for sets of real-time tasks given the desired level of fault tolerance for each task or subset of tasks. Finally, we analyze and compare those bounds with existing bounds for non-fault-tolerant and other variations of RMS.
Excess thyroid hormone at an early stage of development produces marked neurochemical and morphol... more Excess thyroid hormone at an early stage of development produces marked neurochemical and morphological alterations in the rat hippocampal formation. In order to better understand the functional significance of these changes, we tested adult rats treated neonatally with triiodothyronine (T3), and their control litter mates, in a spatial learning task and for the induction of longterm potentiation (LTP) in the dentate gyrus (DG) of the hippocampal formation. The T3-treated rats were significantly impaired in their performance on the spatial task in comparison to their matched controls. Similarly, the efficacy of LTP induction was significantly attenuated in the T3-treated animals. Further, a significant correlation was obtained between LTP induction and performance on the spatial learning task. Thus, a brief neonatal excess of thyroid hormone produces impairments in spatial learning along with decreases in LTP, long held as a model of learning and memory. This relationship provides a unique opportunity to study associations between behavioral, physiological, pharmacological and morphological processes intimately associated with the hippocampal formation
Among three animal fats evaluated, chicken fat (CF) has close similarity in fatty acid profiles w... more Among three animal fats evaluated, chicken fat (CF) has close similarity in fatty acid profiles with cod liver oil (CLO), compared with mutton fat and beef fat; therefore, CF can be one of the potential adulterants in CLO. Fourier transform infrared (FTIR) spectra of CLO, CF, and their mixtures were measured on direct contact with horizontal attenuated total reflectance (HATR) in mid infrared region (4000–650 cm−1) at 32 scanning and 4 cm−1 resolution. The chemometrics of partial least square (PLS) and discriminant analysis (DA) were chosen for the quantification and classification of oil adulterant in CLO. The results showed that FTIR spectroscopy coupled with PLS calibration can predict the level of CF in CLO with coefficient of determination (R2) for the relationship between actual and FTIR predicted value of CF in CLO is 0.996. The root means square errors of calibration (RMSEC) and prediction (RMSEP) obtained using seven principal components (PCs) are 0.346 and 0.513, respectively. DA using the Coomanss plot can classify pure CLO and that adulterated with CF accurately. Besides, DA using 10 PCs can be successfully exploited for the classification of CLO and CLO adulterated with the mixture of animal fats.Entre tres grasas animales evaluadas, la grasa de pollo (CF) mostró una gran semejanza en perfiles de ácidos grasos con aceite de hígado de bacalao (CLO), comparado con grasa de cordero y grasa de buey; la grasa de pollo puede ser uno de los posibles adulterantes de aceite de hígado de bacalao. Espectros FTIR de aceite de hígado de bacalao, grasa de pollo y sus mezclas se midieron en contacto directo con la reflectancia total atenuada horizontal en la región media de infrarrojos (4000 – 650 cm−1) a 32 barridos y resolución de 4 cm−1. Las quimometrías de cuadrados mínimos parciales (PLS) y análisis discriminante (DA) se eligieron para la cuantificación y clasificación de aceite adulterante en aceite de hígado de bacalao. Los resultados mostraron que la espectroscopia FTIR asociada con la calibración de cuadrados mínimos parciales puede predecir el nivel de grasa de pollo en aceite de hígado de bacalao con coeficiente de determinación (R2) para la relación entre valores de reales y FTIR predichos de grasa de pollo en aceite de hígado de bacalao es 0,996. La raíz media cuadrada de errores estándar de calibración (RMSEC) y predicción (RMSEP) obtenidos usando 7 componentes principales (PCs) son 0,346 y 0,513, respectivamente. El análisis discriminante usando el gráfico de Coomans puede clasificar aceite de hígado de bacalao puro y aquél adulterado con CF de una forma precisa. Además, el análisis discriminante usando 10 componentes principales puede ser aprovechado con éxito para la clasificación de aceite de hígado de bacalao y aceite de hígado de bacalao adulterado con la mezcla de grasas animales.
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