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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
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Volume & Issues
Volume 43, Issue 4 - Dec 2015
Volume 43, Issue 3 - Sep 2015
Volume 43, Issue 2 - Jun 2015
Volume 43, Issue 1 - Mar 2015
Selecting the target year
Economic-Statistical Design of Double Sampling T
Control Chart under Weibull Failure Model
Hong, Seong-Ok ; Lee, Min-Koo ; Lee, Jooho ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 471~488
DOI : 10.7469/JKSQM.2015.43.4.471
Purpose: Double sampling
chart is a useful tool for detecting a relatively small shift in process mean when the process is controlled by multiple variables. This paper finds the optimal design of the double sampling
chart in both economical and statistical sense under Weibull failure model. Methods: The expected cost function is mathematically derived using recursive equation approach. The optimal designs are found using a genetic algorithm for numerical examples and compared to those of single sampling
chart. Sensitivity analysis is performed to see the parameter effects. Results: The proposed design outperforms the optimal design of the single sampling
chart in terms of the expected cost per unit time and Type-I error rate for all the numerical examples considered. Conclusion: Double sampling
chart can be designed to satisfy both economic and statistical requirements under Weibull failure model and the resulting design is better than the single sampling counterpart.
Case Study for Improving Lecture Satisfaction using S-NS Diagram
Ree, Sangbok ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 489~498
DOI : 10.7469/JKSQM.2015.43.4.489
Purpose: This paper proposes S-NS diagram. S-NS diagram helps us find core factors which improve customer satisfaction. Methods: S-NS diagram draws a scatter diagram based on marks obtained from surveys consisting of several questions on satisfaction and non-satisfaction at the same time. S-NS diagram is divided into the 4 regions. We focused on region B which is High satisfaction and high non-satisfaction shown in S-NS diagram. Region B is the areas for needs to improve. Results: S-NS diagram can find few important factors which affect customer satisfaction. We improve Lecture Satisfaction using S-NS Diagram. Conclusion: S-NS diagram has been proven to be an effective method for improving customer satisfaction with a lecture satisfaction improvement example. We know S-NS diagram can use many fields including manufacture and service areas.
Development of Quality Improvement Process based on the Maintenance Data of Weapon Systems
Kim, HunGil ; Kwon, SeMin ; Cho, KyoungHo ; Sung, Si-Il ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 499~510
DOI : 10.7469/JKSQM.2015.43.4.499
Purpose: This paper treats the improvement of the quality and reliability of military weapon systems based on the maintenance data. Methods: The proposed method of the data integration and refinement are used to obtain the component reliability information and to find the frequently failed components based on the Pareto analysis. Based on the reliability information and the number of failed component frequencies, the target components of quality improvement are determined and improved by multiple methods such as engineering changes, special meetings, additional training and revising maintenance manuals. Results: Based on the proposed process, we find some components which need to be improved in order to enhance the quality and reliability. Conclusion: A process is developed for improving the quality and reliability of weapon systems. This process will be adopted by various weapon systems to enhance the quality and reliability, as well as reduce military spending.
An Objective method of risk assessment based on RAM analysis for warship
Beak, Yong-Kawn ; Kang, Byoung-Soo ; Jo, Kwan-Jun ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 511~520
DOI : 10.7469/JKSQM.2015.43.4.511
Purpose: This study suggests a method of risk assessment based on RAM analysis in order to reduce the subjectivity. Methods: RAM analysis is used to assessment risk consequence(RC) and risk likelihood(RL). Result: The calculated result of the product, which has higher risk assessment, shows lower MTBF system. Conclusion: Risk assessment based on objective database will provide objectivity and effective quality control.
Comparison of Multivariate CUSUM Charts Based on Identification Accuracy for Spatio-temporal Surveillance
Lee, Mi Lim ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 521~532
DOI : 10.7469/JKSQM.2015.43.4.521
Purpose: The purpose of this study is to compare two multivariate cumulative sum (MCUSUM) charts designed for spatio-temporal surveillance in terms of not only temporal detection performance but also spatial detection performance. Method: Experiments under various configurations are designed and performed to test two CUSUM charts, namely SMCUSUM and RMCUSUM. In addition to average run length(ARL), two measures of spatial identification accuracy are reported and compared. Results: The RMCUSUM chart provides higher level of spatial identification accuracy while two charts show comparable performance in terms of ARL. Conclusion: The RMCUSUM chart has more flexibility, robustness, and spatial identification accuracy when compared to those of the SMCUSUM chart. We recommend to use the RMCUSUM chart if control limit calibration is not an urgent task.
The Cost Efficiency Analysis of JeollaNamdo Food Industry
Qing, Cheng Lin ; Na, JuMong ; Chang, Seog Ju ; Im, Chang Uk ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 533~544
DOI : 10.7469/JKSQM.2015.43.4.533
Purpose: The purpose of this study is to analyze the cost efficiency of food industry in JeollaNamdo. And this study is focused on the correlation between the economic efficiency of food industry and its cost efficiency, based on the analysis of 372 food companies' data in JeollaNamdo in 2012. Methods: DEA cost minimization is the measurement of the cost efficiency of JeollaNamdo food industry in 2012. In this study, the CCR and BBC models have been employed to analyze the decomposing cost efficiency-technical efficiency, allocative efficiency, and scale efficiency respectively. And the Spearman rank correlation and Wilcoxon signed rank test also have been employed to check the correlation and difference between the ranking orders based on the efficiency scores respectively. Results: For the CCR model, mean cost efficiency was found to be 0.084(0.54 for allocative efficiency and 0.19 for technical efficiency). For the BCC model, mean cost efficiency was found to be 0.252(0.453 for allocative efficiency and 0.564 for technical efficiency). Average scale efficiency was found to be 0.38. In analyzing the results, this study argues that the optimal way to improve cost efficiency is by reducing inputs proportionally and changing their combination. Conclusion: The efficiency scores of the two models show high correlation, whereas, the differences between them are also found to be significant. Hence, it should be cautious to select a suitable model when we do the research.
Factors Affecting the Mobile Instant Messenger Satisfaction, Loyalty, and Switching Intention
LEE, Sae-Bom ; WANG, Ya-Qin ; SUH, Yung-Ho ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 545~558
DOI : 10.7469/JKSQM.2015.43.4.545
Purpose: The Purposes of this study are (1) to examine why users are communicating through MIM (2) to understand what factors impact these users' satisfaction and loyalty. Methods: We use a questionnaire survey to collect 256 data on users' perceptions of Kakaotalk. We also use a structural equation modeling method by using AMOS 18.0. Results: Company trust, communication voice, connectedness, and perceived network size are found to be statistically significant factors affecting. Also, satisfaction influence on word of mouth and intention to switch. Conclusion: This study develops a research model from the MIM context. We suggest three points of view as company characteristics, device interactivity, and social factor. We examine the determinants of users' satisfaction and loyalty. The results can offer valuable insights for future mobile services research.
The Impact of Six Sigma, Exploitation and Exploration on Performance
Hwang, Gee-Hyun ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 559~572
DOI : 10.7469/JKSQM.2015.43.4.559
Purpose: Many firms have implemented Six Sigma in order to improve employee's creativity and performance. However, few researchers have studied the effect of Six Sigma on performance through creativity process. This study aims to investigate the impact of Six Sigma, exploitation, and exploration on performance. Methods: Based on literature review, this paper develops hypotheses and tests them by employing a structural equations model. Using survey data of 209 Six Sigma experts who have conducted Six Sigma projects from different companies, this study empirically shows that the activities for Six Sigma enhance exploitation, exploration, and performance. Results: Six Sigma affects exploration and exploitation, each of which in turn enhances performance. It is noted that Six Sigma has an indirect influence on performance through exploitation and exploration. Conclusion: Apart from Parast(2011) who insists that Six Sigma is effective in improving exploitation rather than exploration, this study suggest that Six Sigma can affect both in order to enhance corporate performance.
Development of Load Profile Monitoring System Based on Cloud Computing in Automotive
Cho, Hwee ; Kim, Ki-Tae ; Jang, Yun-Hee ; Kim, Seung-Hwan ; Kim, Jun-Su ; Park, Keoun-Young ; Jang, Joong-Soon ; Kim, Jong-Man ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 573~588
DOI : 10.7469/JKSQM.2015.43.4.573
Purpose: For improving result of estimated remaining useful life in Prognostics and Health Management (PHM), a system which is able to consider a lot of environment and load data is required. Method: A load profile monitoring system was presented based on cloud computing for gathering and processing raw data which is included environment and load data. Result: Users can access results of load profile information on the Internet. The developed system provides information which consists of distribution of load data, basic statistics, etc. Conclusion: We developed the load profile monitoring system for considering much environment and load data. This system has advantages such as improving accessibility through smart device, reducing cost, and covering various conditions.
Understanding and Reducing Performance Variation in New Product Development Using Paper Helicopter Experiment
Shin, Byung-Cheol ; Kim, Si-Ung ; Jeong, Sun Min ; Byun, Jai-Hyun ; Nam, Yong-Seog ;
Journal of the Korean Society for Quality Management, volume 43, issue 4, 2015, Pages 589~606
DOI : 10.7469/JKSQM.2015.43.4.589
Purpose: In developing new products, reducing performance variation is important for competitiveness factors such as quality, cost, and delivery. This paper aims at evaluating three performance variations; measurement, performance evaluation, and manufacturing variations, and then improving product and process design, focused on paper helicopter making case study. Methods: For measurement system analysis, gage R&R (repeatability and reproducibility), linearity, stability are evaluated. Since gage R&R are not satisfactory, the measurement system is improved by adopting voice memos application of iPhone and providing standard measurement procedure. To evaluate performance variation, product deterioration and environment factor (wind speed) is considered. Since the existing design is sensitive to these noise factors, a new product design is developed, which is proven to be robust to the noise factors. Finally, manufacturing variations are evaluated with five factors which can cause variation in flight time. To reduce the impact of three significant factors, three improvement methods are applied. Results: Three performance variations are evaluated and robust paper helicopter design is presented. Conclusion: To reduce measurement and process variations, improved measurement method and paper helicopter making procedure are proposed. A new product design is also presented which is robust to deterioration and environmental variation. This paper is expected to benefit students and practitioners who want to have hands-on knowledge on new product quality improvement.