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    Wyświetlanie 1-4 z 4
    Tytuł:
    Utility optimization-based bandwidth allocation for elastic and inelastic services in peer-to-peer networks
    Autorzy:
    Li, Shiyong
    Zhang, Yue
    Wang, Yan
    Sun, Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/330690.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    peer-to-peer network
    bandwidth allocation
    elastic services
    inelastic services
    utility function
    sieć peer-to-peer
    alokacja przepustowości
    funkcja użyteczności
    Opis:
    This paper considers reasonable bandwidth allocation for multiclass services in peer-to-peer (P2P) networks, measures the satisfaction of each peer as a customer by a utility function when acquiring one service, and develops an optimization model for bandwidth allocation with the objective of utility maximization. Elastic services with concave utilities are first considered and the exact expression of optimal bandwidth allocation for each peer is deduced. In order to obtain an optimum in distributed P2P networks, we develop a gradient-based bandwidth allocation scheme and illustrate the performance with numerical examples. Then we investigate bandwidth allocation for inelastic services with sigmoidal utilities, which is a nonconvex optimization problem. In order to solve it, we analyze provider capacity provisioning for bandwidth allocation of inelastic services and modify the update rule for prices that service customers should pay. Numerical examples are finally given to illustrate that the improved scheme can also efficiently converge to the global optimum.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 1; 111-123
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A combinatorial auction mechanism for time-varying multidimensional resource allocation and pricing in fog computing
    Autorzy:
    Li, Shiyong
    Zhang, Yanan
    Sun, Wei
    Liu, Jia
    Powiązania:
    https://bibliotekanauki.pl/articles/15548021.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fog computing
    combinatorial auction
    time varying multidimensional resource allocation
    resource pricing
    mgła obliczeniowa
    aukcja kombinatoryczna
    wycena zasobów
    Opis:
    It is a hot topic to investigate resource allocation in fog computing. However, currently resource allocation in fog computing mostly supports only fixed resources, that is, the resource requirements of users are satisfied with a fixed amount of resources during the usage time, which may result in low utility of resource providers and even cause a waste of resources. Therefore, we establish an integer programming model for the time-varying multidimensional resource allocation problem in fog computing to maximize the utility of the fog resource pool. We also design a heuristic algorithm to approximate the solution of the model. We apply a dominant-resource-based strategy for resource allocation to improve resource utilization as well as critical value theory for resource pricing to enhance the utility of the fog resource pool. We also prove that the algorithm satisfies truthful and individual rationality. Finally, we give some numerical examples to demonstrate the performance of the algorithm. Compared with existing studies, our approach can improve resource utilization and maximize the utility of the fog resource pool.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2023, 33, 2; 327--339
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis on the influence factor of low-strength wet shotcrete in frigid mining area
    Autorzy:
    Sun, Wei
    Shengyou, Zhang
    Feng, Xinglong
    Hou, Kepeng
    Powiązania:
    https://bibliotekanauki.pl/articles/219132.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    temperatura
    beton natryskowy
    obszar górniczy
    kopalnia
    wet shotcrete
    frigid area
    Fishbone Diagram
    temperature
    low strength
    Opis:
    Wet shotcrete technology is being gradually used in roadway support in frigid mining areas. Thus, problems such as low strength, fragility, and high repair rate have also emerged. This study focuses on low strength, cracking, and other problems in the wet shotcrete support of a mine. It introduced the fishbone diagram to investigate the effects of temperature, cement content, and water-cement ratio (W/C) on the strength of the shotcrete layer. The microscopic morphology of wet shotcrete based on scanning electron microscopy (SEM) is observed. Results demonstrated that temperature was the main influencing factor of wet shotcrete in frigid mining areas. When the curing temperature was lower than 10°C, the early strength of wet shotcrete dropped significantly. Temperatures above 15°C were favorable for later gain in strength. W/C was of a complementary relationship with strength development at different ages. Temperature was the essential factor that influenced the microscopic morphology of wet shotcrete. Furthermore, internal initial porosity and aggregate interface bonding strength had a direct effect on macro-mechanical properties of wet shotcrete.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 2; 285-298
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cassiterite recovery from a sulfide ore flotation tailing by combined gravity and flotation separations
    Autorzy:
    Zhang, Limin
    Khoso, Sultan Ahmed
    Tian, Mengjie
    Sun, Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/1448947.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Cassiterite
    Falcon concentrator
    shaking table
    flotation
    gravity separation
    Opis:
    Cassiterite (SnO2) which is the most important Sn-containing mineral, is extensively found in large quantities in discarded tailings. The recovery of cassiterite from discarded sulfide ore flotation tailings can reduce resource wastage and environmental pollution. The gravity separation technique can recover multiple valuable minerals, such as cassiterite, whose densities considerably differ from those of their associated gangue minerals. However, its recovery efficiency rapidly decreases as the mineral particle grain size decreases. To recover the finer valuable mineral particles from gravity separation tailings, flotation separation can be used as a supplementary method. In this study, the gravity and flotation separation techniques are combined to recover cassiterite from a sulfide ore tailing. The Sn grade and recovery of the final concentrate is 31.40% and 88.05%, respectively, thus indicating a highly efficient recovery of cassiterite by using the combined gravity and flotation separation technique. This study can be an important reference for recovering cassiterite from low-Sn-grade tailings.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 206-215
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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