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    Tytuł:
    Multi–server loss queueing system with random volume customers, non–identical servers and a limited sectorized memory buffer
    Autorzy:
    Ziółkowski, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/27311432.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    multi–server queueing system with heterogeneous servers
    queueing systems with random volume customers
    sectorized memory buffer
    loss probability
    Stieltjes convolution
    wieloserwerowy system kolejkowy z serwerami heterogenicznymi
    prawdopodobieństwo straty
    splot Stieltjesa
    bufor pamięci sektorowany
    system kolejkowy z losowymi klientami
    Opis:
    In the present paper, the model of multi–server queueing system with random volume customers, non–identical (heterogeneous) servers and a sectorized memory buffer has been investigated. In such system, the arriving customers deliver some portions of information of a different type which means that they are additionally characterized by some random volume vector. This multidimensional information is stored in some specific sectors of a limited memory buffer until customer ends his service. In analyzed model, the arrival flow is assumed to be Poissonian, customers’ service times are independent of their volume vectors and exponentially distributed but the service parameters may be different for every server. Obtained results include general formulae for the steady–state number of customers distribution and loss probability. Special cases analysis and some numerical computations are attached as well.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e146764
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single–server queueing system with limited queue, random volume customers and unlimited sectorized memory buffer
    Autorzy:
    Ziółkowski, Marcin
    Tikhonenko, Oleg
    Powiązania:
    https://bibliotekanauki.pl/articles/2173725.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    single-server queueing system
    queueing systems with random volume customers
    sectorized memory buffer
    total volume vector
    Laplace-Stieltjes transform
    system kolejkowy z jednym serwerem
    system kolejkowy z losowymi klientami
    bufor pamięci sektorowany
    wektor objętości całkowity
    transformata Laplace'a-Stieltjesa
    Opis:
    In the present paper, we analyze the model of a single–server queueing system with limited number of waiting positions, random volume customers and unlimited sectorized memory buffer. In such a system, the arriving customer is additionally characterized by a non– negative random volume vector whose indications usually represent the portions of unchanged information of a different type that are located in sectors of unlimited memory space dedicated for them during customer presence in the system. When the server ends the service of a customer, information immediately leaves the buffer, releasing resources of the proper sectors. We assume that in the investigated model, the service time of a customer is dependent on his volume vector characteristics. For such defined model, we obtain a general formula for steady–state joint distribution function of the total volume vector in terms of Laplace-Stieltjes transforms. We also present practical results for some special cases of the model together with formulae for steady–state initial moments of the analyzed random vector, in cases where the memory buffer is composed of at most two sectors. Some numerical computations illustrating obtained theoretical results are attached as well.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143647
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Queueing systems with random volume customers and a sectorized unlimited memory buffer
    Autorzy:
    Tikhonenko, Oleg
    Ziółkowski, Marcin
    Kempa, Wojciech M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055163.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    queueing system
    random volume customers
    sectorized memory buffer
    total volume vector
    Laplace transform
    Laplace–Stieltjes transform
    multivariate L’Hospital rule
    system kolejkowania
    wektor objętości
    transformata Laplace'a
    transformata Laplace'a-Stieltjesa
    Opis:
    In the present paper, we concentrate on basic concepts connected with the theory of queueing systems with random volume customers and a sectorized unlimited memory buffer. In such systems, the arriving customers are additionally characterized by a non-negative random volume vector. The vector’s indications can be understood as the sizes of portions of information of a different type that are located in the sectors of memory space of the system during customers’ sojourn in it. This information does not change while a customer is present in the system. After service termination, information immediately leaves the buffer, releasing its resources. In analyzed models, the service time of a customer is assumed to be dependent on his volume vector characteristics, which has influence on the total volume vector distribution. We investigate three types of such queueing systems: the Erlang queueing system, the single-server queueing system with unlimited queue and the egalitarian processor sharing system. For these models, we obtain a joint distribution function of the total volume vector in terms of Laplace (or Laplace-Stieltjes) transforms and formulae for steady-state initial mixed moments of the analyzed random vector, in the case when the memory buffer is composed of two sectors. We also calculate these characteristics for some practical case in which the service time of a customer is proportional to the customer’s length (understood as the sum of the volume vector’s indications). Moreover, we present some numerical computations illustrating theoretical results.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 3; 471--486
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Working with Socially Maladjusted Youths and Children With Developmental Disorders. Predictors and Correlations of Health Among Personnel in Youth Centres
    Autorzy:
    Szrajda, Justyna
    Sygit-Kowalkowska, Ewa
    Weber-Rajek, Magdalena
    Tudorowska, Malwina
    Ziółkowski, Marcin
    Borkowska, Alina
    Powiązania:
    https://bibliotekanauki.pl/articles/628313.pdf
    Data publikacji:
    2019
    Wydawca:
    Fundacja Pro Scientia Publica
    Tematy:
    teachers, job stress, mental health
    Opis:
    Abstract Background Representatives of helping professions who are working with socially maladjusted youths and children with developmental disorders are particularly exposed to occupational stress. The aim of the study was to evaluate mental and physical well-being, as well as their correlates and predictors in a group of employees working at youth educational centres and sociotherapy centres. Materials and Methods A total of 96 employees working at youth educational centres and sociotherapy centres took part in the study. The following psychometric tools were used: the Psychosocial Working Conditions Questionnaire, the Mini-COPE, the LOT-R, and the GSES. Results The results obtained indicate that people working in helping professions experience mental and physical health problems. Only 3% of the subjects declared they sleep all night. Over 40% and over 35% of the subjects estimate they suffer from low mood and irritation episodes, respectively, rather frequently or continually. Subjects with poorer mental health are more likely to use Helplessness, Avoidance behaviours, or Turning to religion to cope with stress. The strongest predictor of mental well-being is the sense of self-efficacy. Whereas, the strongest predictor of physical well-being is the ability to cope with stress by giving into the feeling of Helplessness.   Conclusions The study demonstrated poor mental and physical well-being of the subjects. A statistically significant correlation was found between sex and the level of mental and physical health. Employees working at youth educational centres and sociotherapy centres with better mental and physical well-being had a stronger sense of self-efficacy and a higher level of life optimism.
    Źródło:
    Journal of Education Culture and Society; 2019, 10, 1; 155-169
    2081-1640
    Pojawia się w:
    Journal of Education Culture and Society
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Głód alkoholu i jego determinanty. Doniesienie wstępne
    Autorzy:
    Chodkiewicz, Jan
    Ziółkowski, Marcin
    Czarnecki, Damian
    Gąsior, Krzysztof
    Juczyński, Artur
    Biedrzycka, Agata
    Nowakowska-Domagała, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1178077.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Kazimierza Wielkiego w Bydgoszczy
    Źródło:
    Polskie Forum Psychologiczne; 2015, XX, 4; 467-483
    1642-1043
    Pojawia się w:
    Polskie Forum Psychologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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