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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Quality Management
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Journal DOI :
The Korean Society for Quality Management
Editor in Chief :
Volume & Issues
Volume 28, Issue 4 - Dec 2000
Volume 28, Issue 3 - Sep 2000
Volume 28, Issue 2 - Jun 2000
Volume 28, Issue 1 - Mar 2000
Selecting the target year
Determination of Optimal Process Mean and Screening specification Limits for a Production Process
Lee, Min-Koo ; Choi, Yong-Sun ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 1~16
This paper considers the problem of determining the optimal process mean and screening specification limits of a surrogate variable associated with product quality under two-stage screening procedure. In two-stage screening, the surrogate variable is inspected first to decide whether an item should be accepted, rejected or additional observations should be taken. If additional observations are required, the performance variable of interest is then observed to classify the undecided items. Assuming that the performance variable and the surrogate variable are jointly normally distributed, the optimal process mean and the screening limits are obtained by maximizing the expected profit which includes selling price, production, reprocessing, inspection and penalty costs. A numerical example is presented and numerical studies are performed to compare the proposed two-stage screening procedure with single-stage screening procedures.
Statistical Package fo Sample Size and Power Determination
Lee, Kwan-Jeh ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 17~38
In application, sample size determination is one of the important problems in designing an experiment. A large amount of literature has been published on the problem of determining sample size and power for various statistical models. In practice, however, it is not easy to calculate sample size and/or power because the formula and other results derived from statistical model are scattered in various textbooks and journal articles. This paper describes some previously published theories that have practical relevance for sample size and power determination in various statistical problems, including life-testing problems with censored cases and introduces a statistical package which calculates sample size and power according to the results described. The screens and numerical results made by the package are demonstrated.
control charts of automcorrelated process using threshold bootstrap method
Kim, Yun-Bae ; Park, Dae-Su ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 39~56
control chart has proven to be an effective tool to improve the product quality. Shewhart charts assume that the observations are independent and normally distributed. Under the presence of positive autocorrelation and severe skewness, the control limits are not accurate because assumptions are violated- Autocorrelation in process measurements results in frequent false alarms when standard control chats are applied in process monitoring. In this paper, Threshold Bootstrap and Moving Block Bootstrap are used for constructing a confidence interval of correlated observations. Monte Carlo simulation studies are conducted to compare the performance of the bootstrap methods and that of standard method for constructing control charts under several conditions.
Assessing Local Influence in Linear Regression Models with Second-Order Autoregressive Error Structure
Kim, Soon-Kwi ; Lee, Young-Hoon ; Jeong, Dong-Bin ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 57~69
This paper discusses the local influence approach to the linear regression models with AR(2) errors. Diagnostics for the linear regression models with AR(2) errors are proposed and developed when simultaneous perturbations of the response vector are allowed- That is, the direction of maximum curvature of local influence analysis is obtained by studying the curvature of a surface associated with the overall discrepancy measure.
Comparison of Statistical Process Control Techniques for Short Production Run
Seo, Sun-Keun ; Lee, Sung-Jae ; Kim, Byung-Tae ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 70~88
Short runs where it is neither possible nor practical to obtain sufficient subgroups to estimate accurately the control limit are common in modem business environments. In this study, the standardized control chart, Hillier's exact method, Q chart, EWMA(Exponentially Weighted Moving Average) chart for Q statistics and EWMA chart for mean and absolute deviation among many SPC(Statistical Process Control) techniques for short runs have been reviewed and advantages and disadvantages of these techniques are discussed. The simulation experiments to compare performances of these variable charts for process mean and variations are conducted for combination of subgroup size, scale and timing of shifts of process mean an/or standard deviation. Based upon simulation results, some guidelines for practitioners to choose short run SPC techniques are recommended.
A Framework for Quality Management Support Information Systems
Suh, Yung-Ho ; Kang, Hyeon-Seok ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 89~102
Many organizations have developed their own traditional quality information systems. But, they think of it as one of the functional information systems not as a company-wide decision support information systems. A study on traditional quality information systems(QIS) has been conducted and a new conceptual framework of quality information system is proposed in this paper. In order to support enterprise wide total quality management aggressively, a new conceptual framework, named quality management support information system(QMSIS) is developed and proposed. This framework is based upon Malcolm Baldrige National Quality Award(MBNQA) model integrates management information system approach and traditional quality information system concept. In this model, organizational performance and process performance can be monitored to support managers , decision making about organizational quality management activities.
A Process Capability Index
Consistent with the Proportion of Nonconforming Items
Im, Tae-Jin ; Pyun, Si-Sub ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 103~122
Process capability indices (PCI)
are widely used to evaluate the process performance. The PCI's have been evolved to consider the 'off targetness' more adequately. However, all of these indices are found to be inconsistent with the proportion of nonconforming items, in some cases. That is, the PCI for a process may result in higher value even when the proportion of defectives increases. For these reasons, we propose a new capability index,
, which is consistent with the defect rate. The characteristics of the new PCI,
are investigated with respect to the existing PCI's. Some statistical properties of an estimator for
are also investigated by a Monte Carlo simulation. Sensitivity study under minor deviation from normality is also performed to show the robustness of
. A good estimator for
is under study.
The Study on the Optimal Estimators in the Presences of Nonresponse
Son, Chang-Kyoon ; Jung, Hun-Jo ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 123~134
In the survey, it is very hard to get the complete response. Because the respondents tend to refuse to the questionnaire with something like incomes of the individual or may not be at home in the survey time. These nonresponses are classified into two groups as the item nonresponse and the unit nonresponse. When the nonresponse happen to the special item of the questionnaire, it is caned item nonresponse. On the other hand the unit nonresponse occurs to the totally missing in questionnaire. In this paper, we only consider to the unit nonresponse situation. We propose that the optimal estimator which is minimized the variance of the estimator under a fixed cost function for the survey and response.
A Study of D-Optimal Design in Nonlinear Model Using the Genetic Algorithm
Yum, Joon-Keun ; Nam, Ki-Seong ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 135~146
This study has adapted a genetic algorithm for an optimal design for the first time. The models using a simulation are the nonlinear models. Using an genetic algorithm in D-optimal, it is more efficient than previous algorithms to get an object function. Not like other algorithms, without any troublesome restrictions about the initial solution, not falling into a local optimal solution, it's the most suitable algorithm. Also if we use it without any adding experiments, we can use it to find optimal design of experimental condition efficiently.
Study on the Progressive Direction of 100PPM Quality Renovation
Koo, Il-Seob ; Lim, Ik-Sung ; Kim, Tae-Sung ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 147~160
An objective of the 100PPM Quality Renovation, which is settled as the Korea quality renovation activity as well as the form of customer-oriented management renovation climate, is strengthening an enterprise competitiveness by worldwide quality insurance. In long-term, the 21 century's quality problem would not be effective without synthetic approach from the view point of management strategy. Another method to obtain the quality ascendancy could be an strategic application of, manufacturing function. In this research, the progressive direction for an effective approach to the 100PPM Quality Renovation is examined through the interpretation of process capability index. Finally, the deployment direction of quality renovation activity is searched.
Determination of Optimum Process Mean and Screening Limits under a Taguchi's Loss Function
Hong, Sung-Hoon ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 161~175
The problem of jointly determining the optimum process mem and screening limits for each market is considered in situations where there are several markets with different price/cost structures. Two inspection procedures are considered; an inspection based on the quality characteristic of interest, and an inspection based on a surrogate variable which is highly correlated with the quality characteristic. The quality characteristic is assumed to be a normal distribution with unknown mean and known variance. A Taguchi's quadratic loss function is utilized for developing the economic model for determining the optimum process mean and screening limits. A numerical example is given.
An Implementation of Configuration Management in ISO 9000 Quality System
Chung, Nam-Kee ; Choi, Jeong-Gil ; Kim, Young-Sik ; Park, Sang-Kyu ; Kim, Jae-Jon ; Hwang, Bu-Hyun ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 176~191
Configuration Management (CM) is a management discipline that applies technical and administrative direction to the development, production and support life cycle of a configuration item. This paper introduces an application of this disicipline to ISO 9000 quality systems. A proto type CM information system caned CM / ISO 9000 is implemented via a comparison and anal37sis of CM standards such as ISO 10007, MIL-STD-2549 and EIA Standard IS-649. This system demonstrates 4 basic CM functions consisting of configuratin identification, change control, configuration status accounting and configuration audit. In the system, configuration items such as documents and drafts can be managed to ensure effective ISO 9000 quality systems. Implementation is supported by IDEF0, IDFF1x in modeling, MS SQL Server Ver. 7.0 as DBMS and Visual Basic Ver. 6.0 for interface programming.
A Study ong the Environmental Management in Chemical Industry: with Relation to Dow Chemical's Environmental Management
Kim, Hyun-Soo ; Park, Young-Taek ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 192~210
Chemical industry has contributed significantly to the enhancement of quality of human life, but it has been regarded as a major area of environmental problem due to the potential hazards in environment and safety. This paper examines environmental management programs of chemical industry such as RC(Responsible Care) and PRTR(Pollutant Release and Transfer Register). Through the survey of Dow Chernical's environmental management system, it is examined in detail how a leading company in chemical industry has coped with environmental problem companywide.
The Effect of Service Quality on Customer Satisfaction & Loyalty in Retail Shop
Baek, Jong-Hyun ; Yoon, Young-Jin ; Ji, Sung-Gu ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 211~241
Service quality is the most well known concept in service company. But, it is not dearly defined yet. This is due to the service property itself. Finding the appropriate rates is so hard working job. The purposes of this study are finding the raters on retail shop, identifying the relationships among the raters and clarifying the customer attribute. To attain the purposes, We developed the rates that are especially adopted to the retail shop. And empirically test the relationships among service quality, customer satisfaction and customer loyalty. Also, to clarify the intension and behavior of customer, we classify the types of customer loyalty and set the 4 type group. We revealed the gap between groups that have different properties.
ISO 9000 Certificatin Process and Business Competitiveness In Slovenia
Pivka, Marjan ; Ursic, Dusko ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 242~251
The Slovenian management have already for a while been intensely trying to catch up the West. We can not generalize this movement yet, though it can be observed in many companies. According to the latest data, already 30% of all employees in Slovenia are participating in the project of quality. More than 400 companies have ISO 900x certified quality systems (in 1999). Our interest as quality consultants, researchers and auditors is the research of the added value given by the ISO 900x certification process to company. This article shows only some result of the research The influence of ISO 9000 certificate on organisation's competitiveness. The research was conducted in 1998 for Slovenian companies.
Quality Audit for Measuring the Effectiveness of Quality Management Systems
Nam, Ji-Hee ; Kim, Kwan-Hyun ; Cho, Moon-Sung ; Lim, Nam-Jin ;
Journal of the Korean Society for Quality Management, volume 28, issue 2, 2000, Pages 252~263
The purport of quality assurance audit and its procedures as specified in ISO 9000 have been reviewed. The principles and techniques for interview, documentation of the results and quality trend analysis were discussed. The practical techniques for the performance of quality audit for measuring the effectiveness of quality management systems were suggested.