tailieunhanh - Six Sigma Projects and Personal Experiences Part 7

Tham khảo tài liệu 'six sigma projects and personal experiences part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Analysing Portfolios of Lean Six Sigma Projects 81 or Z0 x 3 The EWMA control chart has the following control limits and center line and is constructed by plotting Zi versus the sample number i UCL A0 L -A- 1 - 1 - A 2i 4 CL A 5 LCL A - La l- - 1 - 1 - À 2i 1 6 Y 2 - Ail- -I According to Montgomery 1997 values of Ấ in the interval Ấ work well with Ấ Ấ and Ấ being popular. L values between and also work reasonably well. Hunter 1989 has suggested values of Ấ and L to match as closely as possible the performance of a standard Shewhart control chart with Western Electric rules Hunter 1989 . Regression is another tool that may be employed to model and predict a Six Sigma program. The familiar regression equation is represented by equation 7 below yest Pest x f x Pest 7 where f x is a vector of functions only of the system inputs x. Much of the literature on Six Sigma implementation converges on factors such as the importance of management commitment employee involvement teamwork training and customer expectation. A number of research papers have been published suggesting key Six Sigma elements and ways to improve the management of the total quality of the product process corporate and customer supplier chain. Most of the available literature considers different factors as an independent entity affecting the Six Sigma environment. But the extent to which one factor is present may affect the other factor. The estimation of the net effect of these interacting factors is assumed to be partly responsible for the success of the Six Sigma philosophy. Quantification of Six Sigma factors and their interdependencies will lead to estimating the net effect of the Six Sigma environment. The authors are not aware of any publication in this direction. 3. Data base example midwest manufacturer The company used for study is a . based Midwestern manufacturing company which manufactures components for the aerospace industrial and defense .