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Kaya, I., Yalcin, S.. (1402). Analyzing of process capability indices under uncertain information and hesitancy by using Pythagorean fuzzy sets. نشریه علمی دانشگاه سیستان و بلوچستان, 20(7), 85-99. doi: 10.22111/ijfs.2023.7632
I. Kaya; S. Yalcin. "Analyzing of process capability indices under uncertain information and hesitancy by using Pythagorean fuzzy sets". نشریه علمی دانشگاه سیستان و بلوچستان, 20, 7, 1402, 85-99. doi: 10.22111/ijfs.2023.7632
Kaya, I., Yalcin, S.. (1402). 'Analyzing of process capability indices under uncertain information and hesitancy by using Pythagorean fuzzy sets', نشریه علمی دانشگاه سیستان و بلوچستان, 20(7), pp. 85-99. doi: 10.22111/ijfs.2023.7632
Kaya, I., Yalcin, S.. Analyzing of process capability indices under uncertain information and hesitancy by using Pythagorean fuzzy sets. نشریه علمی دانشگاه سیستان و بلوچستان, 1402; 20(7): 85-99. doi: 10.22111/ijfs.2023.7632

Analyzing of process capability indices under uncertain information and hesitancy by using Pythagorean fuzzy sets

Iranian Journal of Fuzzy Systems
دوره 20، شماره 7، بهمن و اسفند 2023، صفحه 85-99    اصل مقاله (615.41 K)
نوع مقاله: Original Manuscript
شناسه دیجیتال (DOI): 10.22111/ijfs.2023.7632
نویسندگان
I. Kaya* 1؛ S. Yalcin2
1Yıldız Technical University Department of Industrial Engineering
2Department of Industrial Engineering, Beykent University, Sarıyer, Istanbul
چکیده
Process capability analysis (PCA) is a completely effective statistical tool for ability of a process to meet predetermined specification limits (SLs). Unfortunately, especially the real case problems include many uncertainties, it is one of the critical necessities to define the parameters of PCIs by using crisp numbers. So, the results obtained may be incorrect, if the PCIs are calculated without taking into account the uncertainty. To overcome this problem, the fuzzy set theory (FST) has been successfully used to design of PCA. We also know that fuzzy set extensions have an important role in modelling the case that include uncertainty, incomplete and inconsistent information and they are more powerful than traditional FST to model uncertainty. Defining of main parameters of PCIs such as SLs, mean (µ) and variance (σ2) by using the flexible of fuzzy set extensions rather than precise values due to uncertainty, time, cost, inspectors hesitancy and the results based on fuzzy sets for PCIs contain more, flexible and  sensitive information. In this study, two of well-known PCIs called Cp and Cpk have been re-designed at the first time by using one of fuzzy set extensions named Pythagorean fuzzy sets (PFSs). Defining PCIs with more than one membership function instead of an only one membership function is enabling to evaluate the process more  broadly more flexibility. For this aim, the main parameters of PCIs have been defined  and analyzed by using PFSs. Finally, four new PCIs based on PFSs such as Csp, Cspk, Cfp and Cfpk have been derived. The proposed new PCIs based on PFSs have been also applied on manufacturing process and capability for gears have been analyzed. It is shown that the flexibility of the PFSs on PCIs enables the PCA to give more realistic,  more sensitive, and more comprehensive results.  
کلیدواژه‌ها
Process capability analysis؛ process capability indices؛ the fuzzy set theory؛ Pythagorean fuzzy sets
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