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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean society for quality management
Journal Basic Information
Journal DOI :
The Korean Society for Quality Management
Editor in Chief :
Volume & Issues
Volume 25, Issue 4 - Dec 1997
Volume 25, Issue 3 - Sep 1997
Volume 25, Issue 2 - Jun 1997
Volume 25, Issue 1 - Mar 1997
Selecting the target year
Maximum Likelihood Estimation of Lifetime Distribution under Stress Bounded Ramp Tests: The Case Where Stress Loaded from Use Condition
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 1~14
This paper considers maximum likelihood (ML) estimation of lifetime distribution under stress bounded ramp tests in which the stress is increased linearly from used condition stress to the stress u, pp.r bound. The following assumptions are used: exponential lifetime distribution under a constant stress, an inverse power law relationship between stress and mean of exponential lifetime distribution, and a cumulative exposure model for the effect of changing stress. Likelihood equations for the parameters involved in the model and asymptotic distribution of the estimators are obtained, and a numerical example is given.
Accelerated Life Test and Data Analysis of the Silver Through Hole Printed Wiring Board
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 15~27
This paper describes a highly accelerated life test (HALT, USPCBT) method for rapid qualification testing of STH PWB(Silver Through Hole Printed Wiring Boards). This method was carried out to be an alternative to the present time-consuming standard 1344 hours life testing(THB). The accelerated life test conditions were
/95%R.H. at 50V bias and without bias. Their results are compared with those observed in the standard 1344 hours life test at
/95%R.H. at 50V bias and without bias. The studies were focused on the samples time-to-failure as well as the associated conduction and failure mechanisms. The abrupt drop of insulation resistance is due to the absorption of water vapour. And the continuous drop of insulation resistance is due to the Ag migration. The ratios of time-to-failure of HALT(USPCBT) to THB were 25 and 11 at 50V bias and without bias respectively.
Strategies for Robust Design with Multiple Responses
Hwang Inkeuk ; Chung Lakchae ;
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 28~46
This paper considers robust design strategies for off-line quality control, with the use of experimental design and response surface methodology, in situations where all products have multiple quality characteristics. These strategies can be developed using the desirability concept of desirability functions to determine the settings of the design factors, not only to get the average performances on target but also to minimize variability around the target values.
Robust Regression for Right-Censored Data
Kim, Chul-Ki ;
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 47~59
In this paper we develop computational algorithms to calculate M-estimators of regression parameters from right-censored data that are naturally collected in quality control. In the case of M-estimators, a new statistical method is also introduced to incorporate concomitant scale estimation in the presence of right censoring on the observed responses. Furthermore, we illustrate this by simulations.
Quality Management and Competitive Strategy
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 60~82
The purpose of this study is to empirically examine the quality competence as a source of competitive advantages. The relationship between quality priority and competitive priority, and the relationship between quality competence and competitive capability are investigated using data collected from 114 manufacturing business units of 75 manufacturing companies. Several measures are used to characterize competitive strategy and value chain, and quality factors including conformance, reliability, durability, performance, and customization. The result indicates that the quality competence paired with competitive strategy positively influences the level of competitiveness, but management performances are not strongly correlated with quality competence.
Development of the Evaluation Checklists for Quality of Educational Softwares - CD-ROM titles and softwares on the internet -
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 83~101
We have developed three evaluation checklists of educational softwares for users such as, learners, teachers and parents, not for the software develops or designers. This study has especially focused on CD-ROM titles and softwares on the internet. The followings were selected as the essential attributes that the educational softwares of high quality should possess : ease of use, technical support and interest of learning for learners, educational value and smartness for teachers, packaging integrity, investment value and childproof for parents. The evaluation checklists were developed on the basis of evaluation criteria which were concretion of the essential attributes. The validity of the evaluation checklists was supported by a theoretical study for the development of ckecklists and the actual development process. The interrater reliability and the retest reliability were confirmed by statistical methods. Thus, the developed checklists can be a useful tool to evaluate educational softwares. This study will contribute to improvement of the software quality and help users in selecting educational softwares.
The Confidence Regions for the Logistic Response Surface Model
Cho, Tae-Kyoung ;
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 102~111
In this paper I discuss a method of constructing the confidence region for the logistic response surface model. The construction involves a, pp.ication of a general fitting procedure because the log odds is linear in its parameters. Estimation of parameters of the logistic response surface model can be accomplished by maximum likelihood, although this requires iterative computational method. Using the asymptotic results, asymptotic covariance of the estimators can be obtained. This can be used in the construction of confidence regions for the parameters and for the logistic response surface model.
The Effect of Extending the Quality Concept on Business Performance : -An Empirical Study on Korean Manufacturing Firms-
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 112~139
The purpose of this study is, to empirically analyze the effect of extension of Quality concept and Quality Management on business performance, and to propose their necessities. And, to offer base manure enforcing our business international competitive power by inducing them to extend the Concept of Quality and to adopt Quality Management. By analyses of the questionnaires, the following consequences are confirmed. First, the company which have the more extended quality concept, is more developed and closer to QM stage(i. e. the most developed stage of Quality Management). Second, the more extended quality concept the company has and the more advanced the company is in the Quality Management, the more positive influence can be made on the improvement of the business performance. Third, the added value per employee is attributed to the extension of quality concept rather than the development stages of Quality Management.
Variation Reducation in Quality Using a Sensitivity Analysis
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 140~153
As product quality is maily determined in the product design and process design step, systematic design should be performed through parameter design and tolerance design. Therefore, we introduced analysis of variance and regression analysis as a statistical method which determine optimal levels of affective design factors to product characteristics, then we compared that process and result. In analysis of variance, variation of quality characteristics arises from noise factors, so the optimal levels of design factors are selected to minimize the effect of noise factors. In regression analysis, variation of quality characteristics aries from variation of each own design factors. As a method to reduce variation of these quality characteristics, sensitivity analysis was performed about each design factors. Through this sensitivity analysis, we represented process to calculate the interaction term of the factors.
An Application of Sensory Engineering's Techniques for Customer Satisfaction
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 154~168
This paper considers an a, pp.ication of one of the sensory engineering's techniques, extraction and categorization of the sensory words, to the product of cars. The fourty five (45) sensory words are extracted in three steps. Two groups, which are characterized by whether possessing a car or not and each group consisting of one hundred persons randomly selected from the twenties or thirties, are asked to answer the questionaires with the extracted words in the five-grade semantic differential. The factor analysis is used to categorize the extracted sensory words, and shows that the words can be grouped into four categories.
Evaluation method of multi-attribute quality using data envelopment analysis
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 169~188
The purpose of this study is concerned with suggesting a new a, pp.oach to evaluating the overall product quality in the sense of the relative efficiency of products, whose quality is measured with 8-dimensional attributes, suggested by Garvin. The attributes included 8 quality measures, that is, performance, features, reliability, conformance, durability, serviceabilit, aesthetics, and perceived quality. This study, also, introduced DEA(Data Envelopment Analysis) as an evaluation tool to tackle the problem of how to measure one product against another when each product can be measured along a number of dimensions, and given that there exists no a priori satisfactory weighting scheme to combine these dimensions into an overall rating for each products. In order to a, pp.y the DEA to evaluating the products, we must define two concepts, such as DMU(Decision Making Units) and input-output relationship. Finally, the suggested method in this study was validated through a case study of the electric jar, and this DEA a, pp.oach can be used in evaluating the other products with multi-attrribute quality.
Changes of teaching methods for the first statistics course
Journal of the Korean society for quality management, volume 25, issue 2, 1997, Pages 189~196
When proferssors teach an introductory statistics course to undergraduate students, they have given unilateral lecture to the students. It is emphasized that the changes are necessary in teaching the introductory statistics course. Some effective and diverse methods are introduced to teach students.