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Wyszukujesz frazę "Hussin, S." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Performance analysis of DFT-S-OFDM waveform for Li-Fi systems
    Autorzy:
    Hussin, S.
    Shalaby, E. Mansour
    Powiązania:
    https://bibliotekanauki.pl/articles/2063891.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    light-fidelity
    visible light communications
    orthogonal frequency division multiplexing
    discrete Fourier transform spread
    peak-to-average power ratio
    Opis:
    In this paper, the effect of an indoor visible light communication channel is studied. Moreover, the analysis of the received power distribution of the photodiode in the line of sight and the first reflection of the channel without line of sight with several parameters is simulated. Two different waveforms are explained in detail. Orthogonal frequency division multiplexing has been widely adopted in radio frequency and optical communication systems. One of the most important disadvantages of the orthogonal frequency division multiplexing signal is the high peak-to-average power ratio. Therefore, it is important to minimize the peak-to-average power ratio in the visible light communication systems more than in radio-frequency wireless applications. In the visible light communication systems, the high peak-to-average power ratio produces a high DC bias which reduces power efficiency of the system. A discrete Fourier transform spread orthogonal frequency division multiplexing is proposed to be used in wireless communication systems; its ability to minimize peak-to-average power ratio has been tested. The analysis of two different subcarrier allocation methods for the discrete Fourier transform-spread subcarriers, as well as the examination of two distinct subcarrier allocation strategies, distributed and localized mapping, are investigated and studied. The effects of an accurate new sub-band mapping for the localized discrete Fourier transform spread orthogonal frequency division multiplexing scheme are presented in this paper. The light-fidelity system performance of the orthogonal frequency division multiplexing and discrete Fourier transform spread orthogonal frequency division multiplexing with different sub-mapping techniques are simulated with Matlab™. A system performance size of bit error rate and peak-to-average power ratio are obtained, as well.
    Źródło:
    Opto-Electronics Review; 2021, 29, 4; 167--174
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance evaluation of UFMC-based VLC systems using a modified SLM technique
    Autorzy:
    Mansour Shalaby, E.
    Dessouky, M.
    Hussin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818194.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    universal filtered multi-carrier
    orthogonal frequency division
    multiplexing
    peak-to-average power ratio
    selected-mapping
    discrete Hartley transform precoding
    Opis:
    Universal filtered multi-carrier (UFMC) is being studied as the favourable waveforms supporting the visible light communication broadcasting systems. However, the UFMC system faces a serious performance degradation on the transmitter side due to its high peak-to-average power ratio (PAPR). High PAPR of the signal is an analytical intention parameter for mobile networks, and it is necessary to minimize it as much as possible. This paper focuses on the PAPR reduction of the UFMC scheme. An efficient hybrid method of the PAPR reduction has been proposed and analysed through the Matlab™ simulation. The proposed hybrid scheme consists of a mixture of the selected-mapping method and the discrete Hartley transform precoding for a UFMC system (SLM-DHT-P-UFMC). The simulation results show that the proposed hybrid system has a better PAPR reduction performance compared to traditional SLM-UFMC and DHT-P-UFMC systems. Hence, LM-DHT-P-UFMC is considered to be the suggested scheme in visible light communication broadcasting systems.
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 85--90
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance evaluation of UFMC-based VLC systems using a modified SLM technique
    Autorzy:
    Mansour Shalaby, E.
    Dessouky, M.
    Hussin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818201.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    universal filtered multi-carrier
    orthogonal frequency division
    multiplexing
    peak-to-average power ratio
    selected-mapping
    discrete Hartley transform precoding
    Opis:
    Universal filtered multi-carrier (UFMC) is being studied as the favourable waveforms supporting the visible light communication broadcasting systems. However, the UFMC system faces a serious performance degradation on the transmitter side due to its high peak-to-average power ratio (PAPR). High PAPR of the signal is an analytical intention parameter for mobile networks, and it is necessary to minimize it as much as possible. This paper focuses on the PAPR reduction of the UFMC scheme. An efficient hybrid method of the PAPR reduction has been proposed and analysed through the Matlab™ simulation. The proposed hybrid scheme consists of a mixture of the selected-mapping method and the discrete Hartley transform precoding for a UFMC system (SLM-DHT-P-UFMC). The simulation results show that the proposed hybrid system has a better PAPR reduction performance compared to traditional SLM-UFMC and DHT-P-UFMC systems. Hence, LM-DHT-P-UFMC is considered to be the suggested scheme in visible light communication broadcasting systems.
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 85--90
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Burnout among Malaysian Teachers in Implementing Curricular Changes
    Autorzy:
    Helmi Norman, Muhammad
    Hussin, Zaharah
    Sakika, Kasful Asra
    Siraj, Saedah Binti
    Aeria, Lawrence Aloysius
    Powiązania:
    https://bibliotekanauki.pl/articles/1972041.pdf
    Data publikacji:
    2018-03-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    teacher burnout
    Malaysia’s Integrated Secondary School Curriculum
    emotional exhaustion
    depersonalization
    personal accomplishment
    Opis:
    Burnout has been widely reviewed and studied. However, the relationship between teacher burnout syndrome and curricular reform is rarely studied. Thus, the aim here is to report on the burnout syndrome among teachers during the implementation of the curriculum in Malaysia namely Integrated Secondary School Curriculum (ISSC). Two hundred and sixty four secondary school teachers who were involved in the ISSC program completed the Maslach Burnout Inventory (MBI) and the Secondary School Curricular Change Questionnaire (SSCCQ). The stepwise regression results showed that the emotional exhaustion (EE) predictor is overall workload and time sufficiency, depersonalization (DP) predictor is complexity of the ISSC, and personal accomplishment (PA) predictor is ISSC practicality. Preventing this phenomenon in the school system can lead to better retention rates among teachers.
    Źródło:
    The New Educational Review; 2018, 51; 209-220
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structured Analysis of Nanostructured Zinc Oxide (ZnO) Thin Films Deposited by Sol-Gel
    Autorzy:
    Hussin, Rosniza
    Hanafi, F.
    Rashid, R. A.
    Harun, Z.
    Kamdi, Z.
    Ibrahim, S. A.
    Ainuddin, A. R.
    Rahman, W.
    Leman, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134100.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sol-gel
    zinc oxide
    ZnO
    thin films
    nanostructured
    Opis:
    In this work, zinc oxide (ZnO) thin films are deposited on glass substrate using the sol-gel spin coating technique. The effect of annealing temperature on structural properties was investigated. The ZnO sol-gel was produced from zinc acetate dehydrate as the starting material with iso-propanol alcohol as the stabilizer. The ratio was controlled, distilled water and diethanolamine as the solvent mixing on a magnetic stirrer for an hour under constant heat of 60°C. The ZnO thin film was deposited using the spin coating technique with the speed of 3000 rpm for 30 minutes before the sample undergoes pre-heat in the oven at the temperature of 100°C for 10 minutes. The sample was annealing in the furnace for an hour at 200°C, 350°C, and 500°C. The X-ray diffraction (XRD) analysis confirms that hexagonal wurtzite structure with zincite and zinc acetate hydroxide hydrate composition. The thin films surface roughness was analyzed using an atomic force microscope (AFM) and scanning electron microscope (SEM) for surface morphology observation.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1055--1060
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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