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Wyszukujesz frazę "Cherkaoui, R." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
High-speed power system stability simulation using analog computation
Autorzy:
Nagel, I.
Fabre, L.
Cherkaoui, R.
Kayal, M.
Powiązania:
https://bibliotekanauki.pl/articles/398151.pdf
Data publikacji:
2010
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
mikroelektroniczna emulacja
symulacja wysokiej prędkości
przemijająca stabilność systemu elektroenergetycznego
obliczenia analogowe
microelectronic emulation
high-speed simulation
power system transient stability
analog computation
ASIC
Opis:
This paper presents a microelectronic emulation approach for high-speed power system computation. First, the problems of existing power system simulators are detailed. This shows that microelectronic emulation is a possible solution for solving the speed problems of existing simulators. Second, this paper presents one specific emulation approach, the so-called AC emulation approach. The ultimate objective of the AC emulation approach is the realization of a power system emulator which reproduces simultaneously a large number of phenomena of different time constants or frequencies with a much higher speed than real time. Frequency dependence of the elements is preserved and the signals propagating in the emulated network are the shrunk or downscaled current and voltage waves of the real power network. The models of the power network components are detailed. Special attention is paid to the generator model which was shown to introduce a systematic error. This systematic error is quantified, analyzed and optimized. Moreover behavioral simulation results confirm the feasibility of this approach which in turn lays the foundation for such an emulator.
Źródło:
International Journal of Microelectronics and Computer Science; 2010, 1, 2; 180-187
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration of a mixed-signal power network transient stability analysis emulator
Autorzy:
Lanz, G
Fabre, L.
Lilis, G
Kyriakidis, T
Sallin, D
Cherkaoui, R.
Kayal, M.
Powiązania:
https://bibliotekanauki.pl/articles/398094.pdf
Data publikacji:
2013
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
analog computer
calibration
field programmable gate array (FPGA)
FPGA
mixed signal
power system dynamics
komputer analogowy
kalibracja
field-programmable gate array
sygnał mieszany
dynamika systemu elektroenergetycznego
Opis:
The emerging field of power system emulation for real time smart grid management is very demanding in terms of speed and accuracy. This paper provides detailed information about the electronics calibration process of a high-speed power network emulator dedicated to the transient stability analysis of power systems. This emulator uses mixed-signal hardware to model the dynamic behavior of a power network. Special design allows the self-calibration of the analog electronics through successive measurements and correction steps. The calibration operation guarantees high resolution of the transient stability analysis results, so that they can be reliably used for operational planning and control on real power networks.
Źródło:
International Journal of Microelectronics and Computer Science; 2013, 4, 4; 142-147
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bio-demographic characteristics of households and risk factors for Down Syndrome in Morocco
Autorzy:
Oulmane, Z.
Cherkaoui, M.
Belahsen, R.
Hilali, M.K.
Powiązania:
https://bibliotekanauki.pl/articles/28763554.pdf
Data publikacji:
2023
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. The most studied risk factors for Down Syndrom (DS) were: region of residence, exposure to chemicals, parents’ education level, cigarette and alcohol use by father or mother or both, and oral contraceptive (OC) use. Objective. The aim of this study was to compare certain variables considered as risk factors on DS such as parental age at birth, OC use, child’s sex, and rank of birth between children with DS and their siblings without DS as well as to determine the socio-bio-demographic characteristics of the families studied compared with the general Moroccan population. Material and Methods. We conducted a cross-sectional analysis of 277 families with 925 siblings and at least one child with DS (279 with DS) between 2014 and 2017. The data are collected using a standardized questionnaire in Marrakech-Safi region. Data were entered and analyzed using the statistical program SPSS statistics software for Windows (version 20.0). Chi-square (χ2) and Student t tests were used for testing statistical significance. Differences were considered significant when the p-value <0.05. Results. The binary logistic regression analysis between DS and non-DS children in their bio-demographic characteristics studied (sex, maternal age at birth, paternal age at birth, oral contraceptive (OC) use, length of oral contraceptive use before pregnancy and rank of birth) showed that only maternal age and paternal age at birth and OC use were associated with DS birth (OR= 1.16; 95% CL: 1.11-1.21, OR= 1.05; 95%CL: 1.01-1.09 and OR= 0.01; 95%CL: 0.00-0.003, respectively). In the other hand, the comparison between socio and bio-demographic characteristics of households studied with data from National Population Survey and Family health (2018) showed a higher level of education in women and men in our sample. Similar results were shown in rate of men and women in paid employment, the rate of smoking and alcohol consumption among men and the rate of OC use before pregnancy among women. Conclusion. These results will help to sensitize the Moroccan population about risk factors for DS.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2023, 74, 4; 415-420
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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