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    Wyświetlanie 1-3 z 3
    Tytuł:
    FSO system performance analysis based on novel Gamma–Chi-square irradiance PDF model
    Autorzy:
    Todorović, Jelena
    Spalević, Petar
    Panić, Stefan
    Milosavljević, Bojana
    Gligorijević, Milan
    Powiązania:
    https://bibliotekanauki.pl/articles/2033970.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    free space optics
    FSO
    Gamma-Chi-square distribution
    atmospheric turbulence
    pointing error
    on-off keying
    OOK
    Opis:
    In order to provide a novel analytically traceable free space optics (FSO) channel model for describing turbulence based irradiance fluctuations, following basic scintillation theory principles, we have derived closed-form expression for probability density function (PDF) of a new statistical Gamma–Chi-square model. Further, capitalizing on provided model, error performances of FSO system over on-off keying (OOK) transmission scheme both in the presence of atmospheric turbulence and misalignment fading (pointing error) is investigated. For both cases, the average bit error rate (ABER) at the receiving side of the system is determined in an analytically closed form. The results are graphically presented in order to analyze the impact of different levels of turbulence, as well as other relevant parameters, on the quality of the received signal in the OOK modulated FSO system.
    Źródło:
    Optica Applicata; 2021, 51, 3; 335-348
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of MPPM FSO transmission over Gamma–Chi-square strong atmospheric turbulence
    Autorzy:
    Todorovic, Jelena
    Spalevic, Petar
    Panic, Stefan
    Abdullah, Majid Hamid
    Pantelic, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2202766.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    FSO
    free space optics
    ABER
    average bit error rate
    MPPM
    multi-pulse pulse-position
    novel Gamma-Chi-square distribution
    channel model
    strong atmospheric turbulence
    Opis:
    In this paper, performance analysis of free space optical (FSO) system operating in conditions of strong atmospheric turbulence over Gamma–Chi-square turbulence model, has been carried out. We have observed reception over multi-pulse pulse-position (MPPM) modulation format for the case of strong atmospheric turbulence conditions modeled with Gamma–Chi-square turbulence model and have compared it with turbulence modeling distributions such are: Gamma–Gamma distribution, K-distribution, negative exponential distribution, log–normal distribution. First, we have provided closed-form analytical expressions for average bit error rate (ABER) at the reception for each observed case and then based on them, we have obtained numerical and Monte Carlo simulation results in order to observe turbulence level impact on system performance.
    Źródło:
    Optica Applicata; 2023, 53, 1; 111--126
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Validation of the Study Burnout Inventory and the Copenhagen Burnout Inventory for the use among medical students
    Autorzy:
    Todorovic, Jovana
    Terzic-Supic, Zorica
    Divjak, Jelena
    Stamenkovic, Zeljka
    Mandic-Rajcevic, Stefan
    Kocic, Sanja
    Ukropina, Snezana
    Markovic, Roberta
    Radulovic, Olivera
    Arnaut, Aleksandra
    Piperac, Pavle
    Mirkovic, Momcilo
    Nesic, Dejan
    Powiązania:
    https://bibliotekanauki.pl/articles/2093888.pdf
    Data publikacji:
    2021-12-13
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    students
    validation
    CBI
    Study Burnout Inventory
    Copenhagen Burnout Inventory
    SBI
    Opis:
    ObjectivesThe aim of this study was to assess the validity and reliability of the Serbian versions of the Copenhagen Burnout Inventory (CBI) and the Study Burnout Inventory (SBI) among fifth-year medical students at 5 universities in Serbia.Material and MethodsThe study included 573 fifthyear medical students at 5 universities in Serbia. The research instrument consisted of SBI and CBI. The reliability of these instruments was assessed using an internal consistency measure (Cronbach’s α), an intra-class coefficient (ICC) and factor analysis.ResultsCronbach’s α for SBI was 0.83, including for exhaustion 0.73, for cynicism 0.70, and for inadequacy 0.48. The test-retest reliability (ICC) was 0.75. Cronbach’s α for personal burnout on CBI was 0.89, for the faculty-related burnout 0.86, and for the faculty-members-related burnout 0.92. Cronbach’s α for CBI was 0.93. The factor analysis for SBI showed 2 factors and for CBI 3 factors.ConclusionsThis study revealed that the Serbian versions of both SBI and CBI could be used for the assessment of burnout in this population.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2021, 34, 6; 737-745
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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