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    Wyświetlanie 1-4 z 4
    Tytuł:
    Hybrid correlated data in risk assessment
    Autorzy:
    Rębiasz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/406391.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    risk
    interactive fuzzy numbers
    random fuzzy numbers
    simulation
    Opis:
    A method for evaluating the risks in a situation has been presented where parameters in the calculation are expressed in the form of dependent fuzzy numbers and probability distributions. The procedure of risk estimation combines stochastic simulation with the execution of arithmetic operations on interactive fuzzy numbers. In order to define operations on such numbers, non-linear programming is used. Relations between the parameters presented in the form of fuzzy numbers and probability distributions are expressed by means of interval regression. The results of computations indicate that the relations between parameters have a significant impact on the ratios characterizing risk.
    Źródło:
    Operations Research and Decisions; 2015, 25, 1; 81-101
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New method of selecting efficient project portfolios in the presence of hybrid uncertainty
    Autorzy:
    Rębiasz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/406365.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    portfolio selection
    data processing
    hybrid uncertainty
    random fuzzy sets
    Opis:
    A new methods of selecting efficient project portfolios in the presence of hybrid uncertainty has been presented. Pareto optimal solutions have been defined by an algorithm for generating project portfolios. The method presented allows us to select efficient project portfolios taking into account statistical and economic dependencies between projects when some of the parameters used in the calculation of effectiveness can be expressed in the form of an interactive possibility distribution and some in the form of a probability distribution. The procedure for processing such hybrid data combines stochastic simulation with nonlinear programming. The interaction between data are modeled by correlation matrices and the interval regression. Economic dependences are taken into account by the equations balancing the production capacity of the company. The practical example presented indicates that an interaction between projects has a significant impact on the results of calculations.
    Źródło:
    Operations Research and Decisions; 2016, 26, 4; 65-90
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-Criteria Decision Analysis (MCDA) methods in Life-Cycle Assessment (LCA) : a comparison of private passenger vehicles
    Autorzy:
    Macioł, A.
    Rębiasz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/406360.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    environmental indicators
    life cycle assessment (LCA)
    LCA
    multicriteria decision analysis
    MCDA
    rule-based MCDA
    fuzzy reasoning in MCDA
    Opis:
    Analogies between the life cycle assessment (LCA) and multicriteria decision analysis (MCDA) methodologies have been discussed as well as LCA as an MCDA problem for resolving the trade-offs between multiple environmental objectives. The objective of this study is to compare a variety of specialised multicriteria methods and knowledge-based methods used to aggregate the results from LCA. The studies were conducted using examples of LCA on private passenger vehicles. The research used two classical methods for multicriteria decision making (AHP and TOPSIS), the method of conventional (crisp) reasoning and Mamdani’s method of fuzzy inference. The results demonstrate that among the methods analysed, only crisp reasoning does not provide satisfactory results.
    Źródło:
    Operations Research and Decisions; 2018, 28, 1; 5-26
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Valuing managerial flexibility : an application of real-option theory to steel industry investments
    Autorzy:
    Rębiasz, B.
    Gaweł, B.
    Skalna, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/406282.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    real options
    switch options
    stochastic processes
    investment decision
    Monte Carlo simulation
    opcje realne
    przełączniki
    procesy stochastyczne
    decyzja inwestycyjna
    symulacja Monte Carlo
    Opis:
    In the steel industry which is subject to significant volatility in its output prices and market demands for different ranges of products the diversification of production can generate important value for switch real options. Therefore, a common practice is to invest in various assets, thus generating the possibility of diversification of production and valuable switch options. The incremental benefit of product switch options in steel plant projects has been assessed. Such options are valued using the Monte Carlo simulation and modeling the prices of and demand for steel products as geometric Brownian motion (GBM). Our results show that this option can generate a significant increase in the net present value (NPV) of metallurgical projects.
    Źródło:
    Operations Research and Decisions; 2017, 27, 2; 91-111
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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