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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:
    The present value of a portfolio of assets with present values determined by trapezoidal ordered fuzzy numbers
    Autorzy:
    Łyczkowska-Hanćkowiak, A.
    Piasecki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/406356.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    present value
    ordered fuzzy number
    portfolio
    revised sum
    Opis:
    We consider the obvious thesis that the present value of a portfolio is equal to the sum of the present values of its components. The main goal of this paper is the implementation of this thesis in the case when present values are determined by trapezoidal ordered fuzzy numbers. We apply the revised sum of ordered fuzzy numbers. The associativity of such a revised sum is investigated here. In addition, we show that the multiple revised sum of a finite sequence of trapezoidal ordered fuzzy numbers depends on the ordering of its summands. Without any obstacles, the results obtained can be generalized to the case of any ordered fuzzy numbers.
    Źródło:
    Operations Research and Decisions; 2018, 28, 2; 41-56
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modifications of order scales for assessing debtors
    Autorzy:
    Wójcicka-Wójtowicz, Aleksandra
    Piasecki, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2176219.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    order scale
    credit scoring
    trapezoidal oriented fuzzy number
    Opis:
    In previous research, the Extended Order Scale (EOS) dedicated to risk assessment was analysed. It was characterised by a Numerical Order Scale (NOS) evaluated by trapezoidal oriented fuzzy numbers (TrOFNs). However, the research showed that EOS with two-stage orientation phases, was too complicated. Therefore, the main aim of our paper is to simplify a Complete Order Scale (COS) to a zero- or one-stage order scale and a hybrid approach. For this purpose, a way to calculate the scoring function is presented. The results show that changes in the COS structure influence the values of a scoring function. Replacing just one linguistic indicator gives different results. Another finding of the research is the method’s flexibility that allows an expert to individually choose the most suitable COS. The research proves that the boundary between various linguistic labels cannot be precisely defined. However, knowledge of a formal COS structure allows it to be transformed into a less complex one.
    Źródło:
    Operations Research and Decisions; 2022, 32, 3; 142--151
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The portfolio problem with present value modelled by a discrete trapezoidal fuzzy number
    Autorzy:
    Piasecki, K.
    Siwek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/406597.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    portfolio
    present value
    discrete trapezoidal fuzzy number
    discount factor
    wartość aktualna
    dyskretna liczba rozmyta
    współczynnik dyskontowy
    Opis:
    A multi-asset portfolio in the case of its present value estimated by a discrete trapezoidal fuzzy number has been assessed. The benefits of owning a security have been evaluated according to an expected fuzzy discount factor. The ambiguity risk has been assessed by an energy measure and indistinctness risk has been evaluated by Kosko’s entropy measure. The relationship between the expected fuzzy discount factor for a portfolio and the expected fuzzy discount factors for its components has been derived. An analogous relationship between the values of the energy measure has been presented. The model has been illustrated by means of a profound numerical case study.
    Źródło:
    Operations Research and Decisions; 2018, 28, 1; 57-74
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    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:
    An algorithm for quadratically constrained multi-objective quadratic fractional programming with pentagonal fuzzy numbers
    Autorzy:
    Goyal, Vandana
    Rani, Namrata
    Gupta, Deepak
    Powiązania:
    https://bibliotekanauki.pl/articles/2175831.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multi-objective quadratic fractional programming model
    MOQFPM
    pentagonal fuzzy number
    PFN
    mean method of α-cut
    parametric approach
    ε-constraint method
    Opis:
    This study proposes a methodology to obtain an efficient solution for a programming model which is multi-objective quadratic fractional with pentagonal fuzzy numbers as coefficients in all the objective functions and constraints. The proposed approach consists of three stages. In the first stage, defuzzification of the coefficients is carried out using the mean method of α-cut. Then, in the second stage, a crisp multi-objective quadratic fractional programming model (MOQFP) is constructed to obtain a non-fractional model based on an iterative parametric approach. In the final stage, this multi- -objective non-fractional model is transformed to obtain a model with a single objective by applying the ε-constraint method. This final model is then solved to get desired solution. Also, an algorithm and flowchart expressing the methodology are given to present a clear picture of the approach. Finally, a numerical example illustrating the complete approach is given.
    Źródło:
    Operations Research and Decisions; 2022, 32, 1; 49--71
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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