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    Wyświetlanie 1-6 z 6
    Tytuł:
    A model for optimizing enterprise’s inventory costs : a fuzzy approach
    Autorzy:
    Kosiński, W
    Muniak, R.
    Kosiński, W. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/406354.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    economic order quantity
    optimization problem
    ordered fuzzy numbers
    Opis:
    Applicability of a fuzzy approach to a problem originating from administrative accounting, namely to determine an economic order quantity (EOQ) in a variable competitive environment with imprecise and vague data, has been presented. For this purpose, the model of ordered fuzzy numbers developed by the first author and his two co-workers is used. The present approach generalizes the one developed within the framework of convex fuzzy numbers and stays outside the probabilistic one.
    Źródło:
    Operations Research and Decisions; 2013, 23, 4; 39-54
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of non-classical operational calculus to indicate hazards in numerical solutions of engineering problems
    Autorzy:
    Mieloszyk, Eligiusz
    Wyroślak, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1845137.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    approximative computation
    non-classical operational calculus
    quantity analysis
    Opis:
    The article addresses the application of non-classical operational calculus to approximative solutions of engineering problems. The engineering-sound examples show that a continuous–discrete problem transformation from differential unequivocal problem to a differential wildcard problem, triggering a change in solution quality. A number of approximative methods are capable to alter both quantitative and qualitative solution effects.
    Źródło:
    Studia Geotechnica et Mechanica; 2020, 42, 3; 242-247
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and experiments using a spiral-liquid-solid fluidized bed system
    Autorzy:
    Sha, J.
    Liang, L.
    Liu, B.
    Xie, G.
    Peng, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/110520.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    liquid-solid fluidized bed
    spiral unit
    coal separation
    water quantity
    Opis:
    Liquid-solid fluidized bed (LSFB) has been widely known and used for separation of coarse coal particles (normally larger than 0.25 mm). The process of separation by LSFB needs fluidization water from the bottom to the top of LSFB. The fluidization water is formed by the water addition at the bottom of the LSFB. Normally the quantity of water addition is very large, which increases the burden of water treatment in coal preparation processes. In this investigation, a spiral unit was introduced into the conventional LSFB and the new separation equipment was named S-LSFB. The spiral unit could provide an upward force for the upward movement of coarse low density coals into the concentrate, and hence the quantity of water addition for fluidization water may be reduced. Samples of 0.5-0.25 mm size fraction coal were used to investigate the difference in separation performance between S-LSFB and LSFB. It was found that the separation performance of S-LSFB was nearly equal to that of LSFB. S-LSFB may be beneficial to coarse coal separation in coal preparation plant since the burden of water treatment can be reduced by the application of S-LSFB.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 427-434
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of EOQ in terms of optimum degrees of horizontal and vertical cooperation at a node of supply chain
    Autorzy:
    Mishra, Prem Prakash
    Zimik, Chipem
    Borkotokey, Surajit
    Powiązania:
    https://bibliotekanauki.pl/articles/2175829.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    horizontal cooperation
    vertical cooperation
    carrying cost
    ordering cost
    economic order quantity
    EOQ
    Opis:
    In a complex supply chain network, the production nodes, seller nodes, and buyers are connected randomly. We assume a process of joining two random nodes leading to the bivariate Poisson probability mass function. There exist two types of links - one is horizontal (H) and the other is vertical (V), which support the continuous flow of commodities through the supply chain. This induces competition among workers at a node to manage these two types of links within fixed constraints and creates bargaining to decide the optimal degree of both types of links at a node. We use the Nash security point to obtain the bargaining solution describing the optimal links. We reduce the carrying cost and ordering cost of inventory, which are contrary in their nature by introducing horizontal and vertical links, respectively. We modify the total cost function and establish a new economic order quantity (EOQ), optimal shortage quantity, and total optimal cost in terms of the optimal degree of H and V cooperation.
    Źródło:
    Operations Research and Decisions; 2022, 32, 2; 89--104
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a single sampling plan minimizing the sum of risks in an EOQ model with trade credit
    Autorzy:
    Veerakumari, Pradeepa
    Harikrishnan, Aruna
    Powiązania:
    https://bibliotekanauki.pl/articles/406609.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    trade credit
    economic order quantity
    EOQ
    minimum sum of risks
    Poisson distribution
    kredyt handlowy
    rozkład Poissona
    Opis:
    Acceptance sampling by attributes is a universally used statistical tool for quality control. It is a technique that deals with the decision to accept or reject a batch of goods using defined procedures. An attribute single sampling plan designed under the assumption that the number of defects has a Poisson distribution is the optimal plan whenever the chance of a defect occurring in the manufacturing process is low. This study introduces the incorporation of an attribute single sampling plan minimizing the sum of risks with an economic order quantity (EOQ) model taking into account the possibility of trade credit. The plan ensures the effectiveness of the optimal design based on the minimization of costs including the inspection costs, stock holding costs and ordering costs.
    Źródło:
    Operations Research and Decisions; 2019, 29, 1; 121-130
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of initial density distribution in simulations of bone remodeling around dental implants
    Autorzy:
    Nutu, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/307275.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    energia odkształcenia
    kość
    warunki początkowe
    przebudowa kości
    strain energy density
    bone quantity
    initial conditions
    bone remodeling simulation
    Opis:
    In this paper, the effect of initial density distribution upon the predicted density via numerical simulations of bone remodeling was evaluated. The main purpose was to correlate the numerical results with clinical data according to which the initial bone quantity is an essential factor for long term survival of dental implants. Methods: Two-strain energy density-based bone remodeling theories were employed, one which accounts for overload resorption and the second one, which does not. The remodeling parameters were derived from the mechanostat theory. Bone remodeling around an osseointegrated dental implant was simulated based on finite element method using a generic mandible plane model. A variable time step was introduced to increase the speed of the remodeling simulations by keeping the truncation errors small. The simulations were performed for several initial density distributions correlated with values from clinical classifications of bone quality. For each density value, the occlusal load was defined in two ways so that to consider normal and overload mastication forces, respectively. Results: The results showed that the initial density distribution influences the predictions of bone remodeling simulations. For the analyzed model, the remodeling algorithm predicted overload resorption only in the case of low initial density, which can be associated with low bone quality, which, from clinical perspective, may probably lead to implant loss. Conclusions: The paper demonstrated that when simulating bone remodeling around dental implants using finite element method, it is important to account for initial density distribution in correlation with the bone quantity.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 4; 23-31
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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