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- The Taguchi loss function is graphical depiction of loss developed by the Japanese business statistician Genichi Taguchi to describe a phenomenon affecting the value of products produced by a company. Praised by Dr. W. Edwards Deming (the business guru of the 1980s American quality movement), it made clear the concept that quality does not suddenly plummet when, for instance, a machinist exceeds a rigid blueprint tolerance. Instead 'loss' in value progressively increases as variation increases from the intended condition. This was considered a breakthrough in describing quality, and helped fuel the continuous improvement movement. The concept of Taguchi's quality loss function was in contrast with the American concept of quality, popularly known as goal post philosophy, the concept given by American quality guru Phil Crosby. Goal post philosophy emphasizes that if a product feature doesn't meet the designed specifications it is termed as a product of poor quality (rejected), irrespective of amount of deviation from the target value (mean value of tolerance zone). This concept has similarity with the concept of scoring a 'goal' in the game of football or hockey, because a goal is counted 'one' irrespective of the location of strike of the ball in the 'goal post', whether it is in the center or towards the corner. This means that if the product dimension goes out of the tolerance limit the quality of the product drops suddenly. Through his concept of the quality loss function, Taguchi explained that from the customer's point of view this drop of quality is not sudden. The customer experiences a loss of quality the moment product specification deviates from the 'target value'. This 'loss' is depicted by a quality loss function and it follows a parabolic curve mathematically given by L = k(y–m)2, where m is the theoretical 'target value' or 'mean value' and y is the actual size of the product, k is a constant and L is the loss. This means that if the difference between 'actual size' and 'target value' i.e. (y–m) is large, loss would be more, irrespective of tolerance specifications. In Taguchi's view tolerance specifications are given by engineers and not by customers; what the customer experiences is 'loss'. This equation is true for a single product; if 'loss' is to be calculated for multiple products the loss function is given by L = k[S2 + ( – m)2], where S2 is the 'variance of product size' and is the average product size. (en)
- 다구치 손실 함수는 일본의 통계학자 가 개발한 손실 함수의 도식적 표현으로 어떤 회사가 생산한 제품의 가치에 영향을 미치는 현상을 묘사하기 위한 것이다. 이는 박사 (1980년대 미국 경영학계 품질 운동의 거장)가 찬양한 바와 같이, 예를 들어 어떤 작업자가 단순히 도면 청사진 공차를 넘는다고 해서 품질이 갑자기 급락하지는 않는다는 개념을 명백히 밝혔다. 대신 의도했던 조건으로부터 분산이 증가함에 따라 가치의 손실이 점차로 증가한다. 이것은 품질을 묘사하는 돌파구로 인식되며 이후에 린 생산으로 발전된 운동을 추진하는 동력이 되었다. (ko)
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- 다구치 손실 함수는 일본의 통계학자 가 개발한 손실 함수의 도식적 표현으로 어떤 회사가 생산한 제품의 가치에 영향을 미치는 현상을 묘사하기 위한 것이다. 이는 박사 (1980년대 미국 경영학계 품질 운동의 거장)가 찬양한 바와 같이, 예를 들어 어떤 작업자가 단순히 도면 청사진 공차를 넘는다고 해서 품질이 갑자기 급락하지는 않는다는 개념을 명백히 밝혔다. 대신 의도했던 조건으로부터 분산이 증가함에 따라 가치의 손실이 점차로 증가한다. 이것은 품질을 묘사하는 돌파구로 인식되며 이후에 린 생산으로 발전된 운동을 추진하는 동력이 되었다. (ko)
- The Taguchi loss function is graphical depiction of loss developed by the Japanese business statistician Genichi Taguchi to describe a phenomenon affecting the value of products produced by a company. Praised by Dr. W. Edwards Deming (the business guru of the 1980s American quality movement), it made clear the concept that quality does not suddenly plummet when, for instance, a machinist exceeds a rigid blueprint tolerance. Instead 'loss' in value progressively increases as variation increases from the intended condition. This was considered a breakthrough in describing quality, and helped fuel the continuous improvement movement. (en)
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- 다구치 손실 함수 (ko)
- Taguchi loss function (en)
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