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Type 2 Fuzzy Control Charts Using Likelihood and Deffuzzification Methods

  • Hatice Ercan TeksenEmail author
  • Ahmet Sermet Anagün
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 643)

Abstract

Besides control charts are used in many fields, they are important because the process gives information about the product’s situation. Thanks to control charts, necessary precautions are taken by noticing abnormal and normal situations of process and/or product. It is considered that at this point the most important and critical thing is that there will be loss of information about the expert opinions. It can be said that this situation is more common especially for the qualitative data. To prevent losses of data like this and so on and to transform linguistic expressions into crisp data, it is needed to take advantage of fuzzy logic that is commonly used recently. Although some studies about creating control charts by fuzzy sets have been done recently, all of them are done only by using type 1 fuzzy sets. However, it is known that much of the data used in daily life cannot be expressed by type 1 fuzzy number. Some data may be more suitable for type 2 fuzzy numbers. In this study, type 2 fuzzy control charts are obtained by using the methods of defuzzification and likelihood. The results are compared with the classical control charts This study aims to use type 2 fuzzy sets in control charts as a new approach.

Keywords

Interval type 2 fuzzy control charts Defuzzification Likelihood 

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Eskisehir Osmangazi UniversityEskisehirTurkey

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