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    Wyświetlanie 1-6 z 6
    Tytuł:
    Optimization of an EPQ model in an imprecise environment with defuzzification by the centroid method under inflation
    Autorzy:
    Arora, Ritu
    Chauhan, Anand
    Sharma, Renu
    Singh, Anubhav Pratap
    Powiązania:
    https://bibliotekanauki.pl/articles/2175846.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fuzzy production inventory model
    selling price dependent demand
    inflation
    triangular fuzzy number
    trapezoidal fuzzy number
    centroid method
    Opis:
    The awareness of making decisions in an imprecise environment has resulted in considering the inventory system under a fuzzy approach. The effects of uncertain demand have been finding increased application in many inventory systems. Uncertainty creates complicated situations for the manufacturer in making decisions. Markets have become more competitive as a result of technological advancements. The effect of inflation on the overall cost of the inventory system is useful in providing a tool for the analysis of inventory decisions. This study intended to estimate the effect of different fuzzy numbers on a manufacturer's annual joint expected total cost. The comparative study of this proposed model has been considered for two different fuzzy numbers with the defuzzification technique as the centroid method. The optimization technique has been used to minimize the producer’s joint expected total cost under the condition mentioned earlier, and the model is validated numerically.
    Źródło:
    Operations Research and Decisions; 2022, 32, 3; 32--48
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability study on non-contact traction power supplysystem based on fuzzy grey relational FTA
    Autorzy:
    Pei, Yanxia
    Li, Xin
    Powiązania:
    https://bibliotekanauki.pl/articles/1841276.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FTA
    grey relational degree
    ICPT technology
    reliability research
    trapezoidal fuzzy number
    triangular fuzzy number
    szary stopień relacyjny
    technologia ICPT
    badania wiarygodności
    trapezoidalna liczba rozmyta
    trójkątna liczba rozmyta
    Opis:
    The traction power supply system based on Inductively Coupled Power Transfer (ICPT) technology is one of the new traction power supply technologies that will bedeveloped in the future. As the core part of rail transit energy transfer and conversion, thetraction power supply system is not only the critical system for the safe operation of railtransit, but also the main source of its failures, so it is of great significance to study itsreliability. In this paper, the reliability analysis of the non-contact traction power supplysystem based on mobile ICPT technology is carried out using the method of (Fault Tree Analysis) FTA combined with triangular fuzzy theory and grey relational theory. Firstly,the fault tree of the system is established, and the minimum cut sets and structure functionof the fault tree are obtained. Then the triangular fuzzy numbers are introduced to representthe probability of the bottom events, and the fuzzy probability of the top event and the fuzzyimportance of the bottom events are determined, after that, the maximum probability offailure of the top event is obtained. Finally, the grey relational degrees of each minimum cutset are obtained and ranked. Furthermore, in order to prove the correctness of this method,the trapezoidal fuzzy FTA is introduced and compared with it. Both research results showthat the loosely coupled transformer and Insulated Gate Bipolar Transistor (IGBT) moduleare the weak links of the system. The results obtained are consistent and realistic, whichproves the correctness of the method selected in this article.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 253-270
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An EOQ inventory model for Gompertz deteriorating items with quadratic demand and constant holding cost in a fuzzy environment
    Autorzy:
    Senbagam, K.
    Kokilamani, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1066258.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Deteriorating items
    Gompertz distribution
    Inventory system
    Pascal triangular method
    Quadratic function
    Triangular fuzzy number
    Opis:
    In this paper we discussed an economic order quantity inventory model for deteriorating items with time-dependent demand rate. Here the demand is considered as a quadratic function of time and deteriorating items follow a Gompertz distribution deterioration. Stock out is not permitted and holding cost is constant. The deterioration cost, holding cost and the parameters α, β are assumed as a triangular fuzzy numbers. Our goal is to maximize the total profit of inventory optimization by using Pascal triangular method. A few numerical examples illustrate the implementation of the proposed model. Sensitivity analysis is the study of how to divide and allocate the uncertainty in the output of a mathematical model or system to different sources of input uncertainty.
    Źródło:
    World Scientific News; 2019, 130; 25-41
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-storage inventory model for deteriorating items with price dependent demand and shortages under partial backlogged in fuzzy approach
    Dwumagazynowy rozmyty model zapasów psujących się o zapotrzebowaniu zależnym od ceny oraz uwzględniający braki
    Autorzy:
    Indrajitsingha, Susanta Kumar
    Samanta, Padmanava
    Raju, Lakshmi Kanta
    Misra, Umakanta
    Powiązania:
    https://bibliotekanauki.pl/articles/362134.pdf
    Data publikacji:
    2019
    Wydawca:
    Wyższa Szkoła Logistyki
    Tematy:
    inventory
    two-warehouse system
    deterioration
    shortages
    triangular fuzzy number
    Graded Mean Integration Representation Method
    zapas
    system dwwumagazynowy
    zepsucie
    braki
    trójkątna liczba rozmyta
    metoda Graded Mean Integration Representation
    Opis:
    Background: In this paper we developed a fuzzy two-warehouse (one is OW, the own warehouse and other is RW, the rented warehouse) inventory model of deteriorating items with price dependent demand rate and allowed shortages under partially backlogged conditions. Since the capacity of any warehouse is limited, the supplier has to rent a warehouse for keeping the excess units over the fixed capacity W of the own warehouse in practice. The rented warehouse owed higher holding cost than the own warehouse. In this paper we considered holding cost, deterioration rate, shortages cost and lost sales as triangular fuzzy numbers. Methods: Graded Mean Integration Representation is used to defuzzify the total cost function. The result obtained by this method is compared with crisp model with the help of a numerical example. Sensitivity analysis is accomplished to changing one parameter at a time and keeping others at their archetypal. Results and conclusions: It has been proved that graded mean integration representation method gives more accurate result as compare to crisp model.
    Wstęp: W pracy zaprezentowano rozmyty model układu dwumagazynowego, składającego się z własnego magazynu (OW) oraz magazyny wynajmowanego (RW) dla asortymentów podlegających psuciu oraz o popycie zależnym od ceny przy dopuszczenia częściowych braków. Ze względu na ograniczoną powierzchnię własną magazynu, dostawca był zmuszony wynająć drugi magazyn w celu magazynowania nadwyżki. Koszt magazynu wynajmowanego jest wyższy niż koszt magazynu własnego. W pracy uwzględniono koszt utrzymywania obiektu, współczynnik psucia, koszt ubytków oraz koszt utraty sprzedaży jak liczby rozmyte. Metody: W celu odwrócenia rozmycia funkcji całkowitego kosztu użyto metody Graded Mean Integration Representation. Otrzymane wyniki porównano z modelem Crisp przy pomocy przykładu liczbowego. Następnie wykonano analizę wrażliwości zmieniają jeden z parametrów przy utrzymaniu niezmienionych pozostałych. Wyniki i wnioski: Wykazano, że wyniki uzyskane przy zastosowaniu metody Graded Mean Integration Representation są dokładniejsze aniżeli przy zastosowaniu modelu Crisp.
    Źródło:
    LogForum; 2019, 15, 4; 487-499
    1734-459X
    Pojawia się w:
    LogForum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating organizational antifragility via fuzzy logic : the case of an Iranian company producing banknotes and security paper
    Autorzy:
    Ghasemi, A.
    Alizadeh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/969063.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    antifragility
    X-events
    triangular fuzzy number
    entropy technique
    linguistic term
    Euclidean distance
    liczba rozmyta trójkątna
    entropia
    termin lingwistyczny
    odległość euklidesowa
    Opis:
    The concept of antifragility has received much attention from researchers in recent years. Contrary to fragile systems which fail when exposed to stressors, antifragile systems prosper and improve in response to unpredictability, volatility, randomness, chaos and disturbance. The implications of antifragility goes beyond resilience or robustness. A resilient system resists stress and remains the same; while an antifragile system improves. Taleb argues that antifragility is required for dealing with events that he called black swans or X-events, which are scarce, unpredictable, and extreme events. Such events come as a surprise and have major consequences. The concept of antifragility was developed by Taleb in a socioeconomic context, not in industrial production. However, the authors think that this concept may have its greatest practical utilization when applied to industrial environments. Thus, they focused on this concept in the article aiming to investigate the level of antifragility in an organization. In order to perform this, the authors used a case study based on an Iranian manufacturer of banknotes and security paper (TAKAB). Firstly, a questionnaire was designed based on 7 criteria related to antifragility using the five-point Likert scale and a triangular fuzzy number for each linguistic term is defined. In the next phase, the weight of each component was obtained using the entropy technique. In the final stage, the Euclidean distance between the aggregated fuzzy antifragility index (FAI) and each linguistic term used during this case study was calculated. Finally, based on these results, the level of the organization’s antifragility was assessed as satisfactorily antifragile, based on the minimum Euclidean distance.
    Źródło:
    Operations Research and Decisions; 2017, 27, 2; 21-43
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of demand boosting policy on optimal inventory policy for imperfect lot size with backorder in fuzzy environment
    Autorzy:
    Yadav, D.
    Singh, S. R.
    Kumari, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/206244.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    learning curve
    advertisement
    signed distance
    triangular fuzzy number
    backorder
    inventory model
    Opis:
    This paper investigates an Economic Order Quantity (EOQ) model with backorder by taking imprecise demand rate with dependence upon the frequency of advertisement. The formulated model also incorporates learning effects on percentage of defective items present in each lot. Due to imprecision in demand, the obtained profit function is fuzzy. To determine the optimal values, we determine the equivalent crisp profit function by applying the signed distance method. Optimal order quantity and backorder level are obtained by using algebraic method in place of differential calculus. A numerical example is used to study the behavior of the model with respect to different inventory parameters. All calculations are performed with MATLAB 7.4.
    Źródło:
    Control and Cybernetics; 2012, 41, 1; 191-212
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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