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    Wyświetlanie 1-3 z 3
    Tytuł:
    Evaluation of efficiency and reliability of airport processes using simulation tools
    Autorzy:
    Gołda, Paweł
    Zawisza, Tomasz
    Izdebski, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2038035.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    efficiency
    airport processes
    simulation tools
    safety of airport operations
    genetic algorithm
    reliability airport processes
    Opis:
    The purpose of this paper is to evaluate the efficiency of airport processes using simulation tools. A critical review of selected scientific studies relating to the performance of airport processes with respect to reliability, particularly within the apron, has been undertaken. The developed decision-making model evaluates the efficiency of airport processes in terms of minimizing penalties associated with aircraft landing before or after the scheduled landing time. The model takes into account, among other things, aircraft take-offs and landings and separation times between successive aircraft. In order to be able to verify the correctness of the decision-making model, a simulation tool was developed to support decision making in the implementation of airport operations based on a genetic algorithm. A novel development of the structure of a genetic algorithm as well as crossover and mutation operators adapted to the determination of aircraft movement routes on the apron is presented. The developed simulation tool was verified on real input data.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 4; 659-669
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of airside aerodrome infrastructure by SAW method with weights from Shannons interval entropy
    Autorzy:
    Żak, Jolanta
    Gołda, Paweł
    Cur, Krzysztof
    Zawisza, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2067399.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    entropy
    aerodrome infrastructure
    SAW
    Opis:
    Multi-criteria decision support (MCDM) methods are widely used in many areas of science. This applies to economic, social and technical sciences. Implementing activities at the strategic, tactical or operational level requires appropriate tools to support decision-makers. The use of these tools requires the preparation of a decision model along with the formalization of the goal and the acquisition and preparation of data to make the decision accurate. Due to the wide application of MCDM in engineering practice, the article presents their application in air transport. It is an area that is constantly evolving, and all decisions at the strategic level have long-term effects and must be adequately justified. In the paper a compartmental extension of the classical SAW method with weights obtained using the compartmental Shannon entropy was proposed. This paper presents issues concerning the choice of airport layout and describes the problems that occur in determining the cost and capacity of airports. This paper reviews the literature on airport capacity and operations and airside air transport processes and the application of various multi-criteria decision support methods to airport problems. The main part of the article contains an optimization mathematical model aimed at determining the parameters of the elements comprising the airport, on the basis of which a simulation model was developed and a modified method of multi-criteria evaluation of SAW taking into account the interval numbers was presented, in which the set of weights was estimated by the Shannon entropy method. In the application part for 3 variants of the airport arrangement, the parameters were determined in the form of interval numbers and then evaluated using the presented method. The presented numerical example shows that the proposed method is an excellent tool to assist in solving complex decision problems where the data are imprecise and represented by interval numbers.
    Źródło:
    Archives of Transport; 2021, 60, 4; 171--185
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Internet use for instrumental purposes in relation to the quality of life among elderly females and males in Poland – mediating effects of loneliness and social support
    Autorzy:
    Wójcik, Grzegorz
    Kniaziuk, Karolina
    Zawisza, Katarzyna
    Tobiasz-Adamczyk, Beata
    Grodzicki, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2084857.pdf
    Data publikacji:
    2022-04-11
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    quality of life
    social support
    loneliness
    internet use
    gender-related differences
    Polish elderly population
    Opis:
    ObjectivesThe study explores the direct and indirect associations (i.e., through the extent of the level of loneliness and perceived social support) between internet use for instrumental purposes and the quality of life (QoL) among elderly females and males in Poland.Material and MethodsThe analysis was based on 2001 face-to-face interviews performed among randomly selected individuals aged ≥65 years from the general population. The collected data was weighted to generalize the study sample for the reference population. The analysis was conducted using multiple linear regression models. The mediation effect was tested according to the Baron and Kenny approach.ResultsThe obtained results indicate that internet use for instrumental purposes is directly related to a better QoL of elderly Polish males. This positive effect among men also occurs indirectly, through the decrease in loneliness levels as well as the increase in social support scores. It has also been shown that among elderly females, the effect of internet use for instrumental purposes is not related to a better QoL, either directly or indirectly.ConclusionsInternet use for instrumental purposes seems to be important in enhancing a successful life among elderly male adults. However, these technologies are not associated with better QoL among females. Practitioners should be aware of these gender differences. The study adds to the previous studies by demonstrating that the feeling of loneliness and social support mediates the relationship between internet use for instrumental purposes and QoL among elderly males, whereas among elderly females this effect does not occur.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2022, 35, 2; 169-185
    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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