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    Evaluation of the hybrid renewable energy sources using sustainability index under uncertainty
    (Elsevier, 2021) Yurek, Yagmur Torul; Bulut, Merve; Ozyoruk, Bahar; Ozcan, Evrencan
    Asa result of continuous growth in population, efforts to meet increasing energy demand in a balanced way in the future as it is today, has led to the emergence of the sustainability concept. Sustainability is mainly considered with technical, economic, environmental and social aspects, hence the most effective instruments to ensure sustainability are renewable energy technologies which are interchangeably used for sustainability. Renewable energy problems regarding sustainability have inherently conflicting goals with a high degree of ambiguity and complexity. To address these problems, multi-criteria decision making (MCDM) approach serve best. Therefore, in this study, a MCDM approach integrating Pythagorean fuzzy sets (PFSs) in AHP-TOPSIS method combination was used to calculate the sustainability index and for ranking renewable energy technologies, hybrids and battery energy storage systems (BESSs) in Turkey. The sustainability index was handled in three main aspects, i.e., uninterrupted supply, economic supply and environmentally friendly supply. The results pointed out that hydro + solar and wind + solar hybrid alternatives have the highest sustainability index value while geothermal and biomass rank as the lowest two alternatives energy technologies. (C) 2021 Elsevier Ltd. All rights reserved.
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    Öğe
    The goal programming approach for the assembly area workload distribution problems
    (Gazi Univ, Fac Engineering Architecture, 2009) Ozyoruk, Bahar; Akgun, M. Bilgehan
    In the real life, the systems generally have multiple and confliction aims. In the airplane industry, the elements of zero defect and punctual delivery are significant for security and prestige. However, it is obvious that the rapid and intensive production for punctual delivery would increase the level of defect. In this respect, our study aimed to solve the problem of workload distribution to alternative assembly cells in an air vehicle producing factory in regards to those elements. Throughout the solution process, the technique of goal programming, which finds out the effective solution after evaluating the confliction aims at the same time, is used. With this technique, the elements of zero defect and punctual delivery are aimed to be obtained at the same time without ignoring the costs. Therefore, it was planned to have full work at alternative montage cells and to meet the demands in the same week. By using the standard work as full, the overtime at assembly cells has lessened and therefore, the production costs have decreased. In addition, by meeting the demands in the same week, the risk of delay in the delivery has been removed.