Journal of The Japanese Society for Quality Control
Online ISSN : 2432-1044
Print ISSN : 0386-8230
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Volume 31, Issue 3
Displaying 1-10 of 10 articles from this issue
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Features
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Research Papers
Contributed Paper
  • Bootstrap Control Limits of X Charts in the Presence of Autocorrelation
    Hideo SUZUKI
    Article type: Contributed Paper
    2001 Volume 31 Issue 3 Pages 99-113
    Published: July 15, 2001
    Released on J-STAGE: August 29, 2018
    DOIhttps://doi.org/10.20684/quality.31.3_99
    JOURNAL RESTRICTED ACCESS
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    Conventional statistical process control charts are based an a fundamental assumption that process data are independent and identically distributed (iid) when a process is in control. In practice, however, process data are not always independent. In continuous process industries, such as the chemical industry, most process data are autocorrelated. In Such cases, the control limits may not be accurate. The bootstrap is a powerful computer-based method and is useful if complicated models, such as Autoregressive models, are required, because mathematical complexity does not impede bootstrap analysis of accuracy. This paper proposes the application of the bootstrap method to the construction of control charts for the mean (X charts) in the presence of autocorrelation, using the approach to model-based resampling in time series introduced by Efron and Tibshirani (1986) and the percentile method for inferring confidence intervals proposed by Efron (1987). Simulation studies are conducted in order to compare the performance of the proposed method to that of the standard methods and the moving blocks bootstrap method for the construction of control charts under several different conditions.
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  • A Method of Evaluating/Diagnosing TQM Considering its Development Process
    Sintaro NAKATSUKASA, Takeshi NAKAJO
    Article type: Contributed Paper
    2001 Volume 31 Issue 3 Pages 114-126
    Published: July 15, 2001
    Released on J-STAGE: August 29, 2018
    DOIhttps://doi.org/10.20684/quality.31.3_114
    JOURNAL RESTRICTED ACCESS
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    There have been various methods for evaluating and/or diagnosing TQM. These methods, however, did not sufficiently consider the fact that the key activities for the promotion of TQM differ from phase to phase, e.g., introduction, developing, developed and advanced. In this study, a framework for evaluating and/or diagnosing TQM was derived through the considerations on the evaluation items of Deming Prize. Japan Quality Award, and ISO 9000 assessment and registration program. This framework was used to investigate the development processes of TQM in actual organizations and analyze how the effects of the promotion of TQM depend on the status of TQM. Based on the analysis, a method for evaluating and/or diagnosing TQM of an organization was proposed. As a result, it can be concluded that there exist the key activities in each phase, which play an important roie to shift to the upper phase in the course of TQM promotion, and the method for evaluating and/or diagnosing TQM considering this fact is useful for effective and efncient promotion of TQM.
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