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김계완,서현수,윤덕균 한국품질경영학회 2004 품질경영학회지 Vol.32 No.2
Using the p chart is not adequate in case that there are lots of data and it is difficult to divide into products conforming or nonconforming because of obscurity of binary classification. So we need to design a new control chart which represents obscure situation efficiently. This study deals with the method to performing arithmetic operation representing fuzzy data into fuzzy set by applying fuzzy set theory and designs a new control chart taking account of a concept of classification on the term set and membership function associated with term set.
검사/계측시스템의 능력분석을 포함한 비공정능력지수의 개발과 적용
민성진,김계완,류정현,윤덕균 한국품질경영학회 2002 품질경영학회지 Vol.30 No.1
This paper presents a process incapability index to provide manager with various information of process and to reduce cost. The introduced process incapability indices indicate information about mean and variance of manufacturing process and variance of inspection process to evaluate process capability using ratio of variance and difference between target and mean to specification. This model can be used by the scale of six sigma management.