Showing papers in "Journal of Quality Technology in 1994"
TL;DR: In this article, the authors considered the properties of the X chart when the size of each sample depends on what is observed in the preceding hours and the usual practice in using a control chart to monitor a process is to take samples of size n from the process every h hours.
Abstract: The usual practice in using a control chart to monitor a process is to take samples of size n from the process every h hours. This article considers the properties of the X chart when the size of each sample depends on what is observed in the preceding ..
270 citations
TL;DR: This article provides a survey and brief summary of the work on economic designs published during the period from 1981 through 1991 about process control charts.
Abstract: Many new approaches and applications have been developed in the area of the economic design of process control charts. This article provides a survey and brief summary of the work on economic designs published during the period from 1981 through 1991...
241 citations
TL;DR: In this paper, a combine X control chart is proposed, where the process control engineer waits until the control scheme signals an out-of-control condition, and then the process can be restarted.
Abstract: A conventional X control chart works in an open loop manner. That is, the process control engineer waits until the control scheme signals an out-of-control condition. This paper proposes a combine...
240 citations
TL;DR: This paper focuses on the application of statistical process control to engineering process control (EPC) processes, which are usually applied to processes in which successive observations are viewed as statistically independent.
Abstract: Statistical process control (SPC) is traditionally applied to processes that vary about a fixed mean, and where successive observations are viewed as statistically independent. Engineering process control (EPC) is usually applied to processes in which ..
219 citations
TL;DR: A control chart for parts-per-million nonconforming items is presented in this article, with a focus on parts per-million nonconformity in parts per million items.
Abstract: (1994). A Control Chart for Parts-Per-Million Nonconforming Items. Journal of Quality Technology: Vol. 26, No. 3, pp. 239-240.
161 citations
TL;DR: Many quality control problems are multivariate in character since the quality of a given product or object consists simultaneously of more than one variable as mentioned in this paper, and a good multivariate quality control pro...
Abstract: Many quality control problems are multivariate in character since the quality of a given product or object consists simultaneously of more than one variable. A good multivariate quality control pro...
160 citations
TL;DR: Taguchi's experimental system is used to develop robust processes, that is, processes which are insensitive to variations in uncontrollable variables, such as environmental variables.
Abstract: Taguchi's experimental system is used to develop robust processes, that is, processes which are insensitive to variations in uncontrollable variables, such as environmental variables. Taguchi's recommended designs can be considered to be response surfac..
153 citations
TL;DR: This paper presents a meta-modelling procedure called Taguchi Methods, a version of which was originally developed by Shigeru Taguchi at the University of Tokyo in 1991 and then refined by his students at the Massachusetts Institute of Technology.
Abstract: (1994). Taguchi Methods: A Hands-On Approach. Journal of Quality Technology: Vol. 26, No. 1, pp. 77-78.
113 citations
TL;DR: In this article, the interarrival times for a homogeneous Poisson process are modeled as a control chart for monitoring the rate of occurrences of events such as nonconforming items.
Abstract: Control charts are needed in many manufacturing processes for monitoring the rate of occurrences of events such as nonconforming items. This rate can usually be modeled by the interarrival times for a homogeneous Poisson process, which are independent ..
96 citations
TL;DR: It has been well accepted that dependence on inspection to correct quality problems is ineffective and costly, and hence screening (100% inspection) should not be used as a long-term solution for quality problems.
Abstract: It has been well accepted that dependence on inspection to correct quality problems is ineffective and costly, and hence screening (100% inspection) should not be used as a long-term solution for i...
93 citations
TL;DR: In this article, the key to managing chaos is understanding variation, and the key is understanding Variation, The Key to Managing Chaos, is discussed, and a discussion of the key of variation is presented.
Abstract: (1994). Understanding Variation, The Key to Managing Chaos. Journal of Quality Technology: Vol. 26, No. 2, pp. 152-152.
TL;DR: A mixture experiment involves varying the proportions of two or more ingredients, called components of the mixture, and studying the changes that occur in the measured properties (responses) of the components as mentioned in this paper.
Abstract: A mixture experiment involves varying the proportions of two or more ingredients, called components of the mixture, and studying the changes that occur in the measured properties (responses) of the...
TL;DR: In this paper, the authors consider several aspects of the design strategy for individual and moving range charts and find that the X chart alone is nearly as efficient as the moving range chart.
Abstract: Individuals and moving range charts are often used when production volume is too low to justify rational subgrouping. This article considers several aspects of the design strategy for these charts. We have found that the X chart alone is nearly as effic..
TL;DR: Robust-design experiments enable engineers to reduce the variance of important quality characteristics by identifying design factors with dispersion effects and guiding the choice of nominal levels of quality.
Abstract: Robust-design experiments can be a very useful tool for improving quality. They enable engineers to reduce the variance of important quality characteristics by identifying design factors with dispersion effects and guiding the choice of nominal levels o..
TL;DR: A FORTRAN program that enables users to determine economic, statistical, or economic-statistical X chart designs is presented.
Abstract: A FORTRAN program that enables users to determine economic, statistical, or economic-statistical X chart designs is presented. Economic designs are designs that minimize cost as measured by the Lo...
TL;DR: The impact of leverage, influential observations, and multicollinearity in mixture experiments is discussed and it is shown that consideration of these factors is important in the practical selection of a mixture design.
Abstract: The impact of leverage, influential observations, and multicollinearity in mixture experiments is discussed. By example, it is shown that consideration of these factors is important in the practical selection of a mixture design. Both standard simplex..
TL;DR: A comprehensive table providing practical use of blocking techniques for small 2k-p designs is presented, providing examples of how these designs can often significantly increase their efficiency.
Abstract: Small 2k-p designs are increasingly being used in industry for process and product experimentation. Blocking of these designs can often significantly increase their efficiency. To facilitate the practical use of blocking, a comprehensive table providing..
TL;DR: A FORTRAN program is given to calculate the run length distribution (RLD), the average run length (ARL), and the standard deviation of therun length (SDRL) for residual control charts used to monitor autocorrelated process output.
Abstract: A FORTRAN program is given to calculate the run length distribution (RLD), the average run length (ARL), and the standard deviation of the run length (SDRL) for residual control charts used to moni...
TL;DR: Exponentially distributed observations arise naturally in the context of monitoring the rate of occurrences of events like nonconforming items as discussed by the authors, and Cumulative sum (CUSUM) control charts are known to be...
Abstract: Exponentially distributed observations arise naturally in the context of monitoring the rate of occurrences of events like nonconforming items. Cumulative sum (CUSUM) control charts are known to be...
TL;DR: The purpose of this paper is to develop a model for simultaneously selecting the optimal target means for both a variables and an attribute quality characteristic to maximize the expected profit per item.
Abstract: The purpose of this paper is to develop a model for simultaneously selecting the optimal target means for both a variables and an attribute quality characteristic. The objective is to maximize the expected profit per item. The expected profit per item..
Journal Article•
TL;DR: In this article, the authors present Reliability Improvement with Design of Experiments (RDI-DEV), a technique for improving the reliability of experimental design with design of experiments.
Abstract: (1994). Reliability Improvement with Design of Experiments. Journal of Quality Technology: Vol. 26, No. 3, pp. 242-243.
TL;DR: Experimental design techniques were applied to the task of characterizing the inspection capability of the machine vision component of an automated laser hole-drilling and inspection system for gas turbine engine manufacturing.
Abstract: Experimental design techniques were applied to the task of characterizing the inspection capability of the machine vision component of an automated laser hole-drilling and inspection system for gas turbine engine manufacturing. The system uses a laser t..
TL;DR: Graph-aided methods for accommodating the estimation of interactions in factorial experiments have become popular among industrial users as mentioned in this paper, and notable among them is the method of linear graphs due to Taguchi.
Abstract: Graph-aided methods for accommodating the estimation of interactions in factorial experiments have become popular among industrial users. Notable among them is the method of linear graphs due to Taguchi. Previously, some shortcomings of Taguchi's linear..
TL;DR: The best friend is always being the best friend for spending little time in your office, night time, bus, and everywhere as mentioned in this paper, and it will be a good way to just look, open and read the book while in that time.
Abstract: Excellent book is always being the best friend for spending little time in your office, night time, bus, and everywhere. It will be a good way to just look, open, and read the book while in that time. As known, experience and skill don't always come with the much money to acquire them. Reading this book with the PDF sense and nonsense of statistical inference controversy misuse and subtlety will let you know more things.
TL;DR: The Shewhart Control Charts with Unequal subgroup sizes were used in this paper for the first time in 1994, and the results showed that the subgroups in the control chart were unequal.
Abstract: (1994). Shewhart Control Charts with Unequal Subgroup Sizes. Journal of Quality Technology: Vol. 26, No. 1, pp. 64-67.
TL;DR: In many applications, exact tests of hypotheses for variance components are not available and approximate methods must be used as mentioned in this paper, and many investigators form approximate tests, which are often of interest in random effects analysis of variance models.
Abstract: Tests of hypotheses for variance components are often of interest in random effects analysis of variance models. However, in many applications, exact tests are not available and approximate methods must be used. Many investigators form approximate tests..