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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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The Korean Society for Quality Management
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Volume & Issues
Volume 39, Issue 4 - Dec 2011
Volume 39, Issue 3 - Sep 2011
Volume 39, Issue 2 - Jun 2011
Volume 39, Issue 1 - Mar 2011
Selecting the target year
Simulation Modeling for RAM Analysis of a Searching System
Yun, Won-Young ; Han, Young-Jin ; Park, Go-Eun ; Choi, Chung-Hyun ; Jung, Duk-Jae ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 353~364
RAM(Reliability, Availability and Maintainability) is one of the important indicators to show the performance of weapon systems. For analyzing RAM characteristics, RAM simulation is useful and powerful as mathematical techniques. However, it is necessary to build the simulation model to express about the operation environment of weapon systems, and obtain detail input data for reliability and maintainability about the system to get accurate results by RAM simulation. In this paper, we propose a procedure to analyze RAM of the searching system consisting in weapon systems by RAM simulation and we estimate searching system availability by a commercial simulation program, AvSim.
Integrating Inverse problem to robust design for a generic drug development process
Truong, Nguyen Khoa Viet ; Shin, Sang-Mun ; Jeong, Seong-Hoon ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 365~376
Robust design (RD) has emerged as a key feature in process design and development for more than twenty years. Many researchers and industrial engineers around the world have invested their intensive efforts to develop and apply RD in many fields in order to improve quality of output products. However, there is also room for improvement. The primary objective of this research is to determine "robust formulation" of a medicine by checking its gelation index. In order to achieve this target, based on the nature of problem, at first, a customized experimental format is designed for obtaining data. Second, time-depended responses based models are developed by the proposed inverse problem (IP) methodology. Third, an RD model based on mean square error (MSE) concept is introduced for time-depended responses. Finally, the proposed approach is illustrated by a case study while comparing obtained results to the response surface methodology (RSM) approach.
Multiresponse Optimization: A Literature Review and Research Opportunities
Jeong, In-Jun ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 377~390
A common problem encountered in product or process design is the selection of optimal parameter levels which involves simultaneous consideration of multiple response variables. This is called a multiresponse problem. A multiresponse problem is solved through three major stages: data collection, model building, and optimization. Up to date, various methods have been proposed for the optimization, including the desirability function approach and loss function approach. In this paper, the existing studies in multiresponse optimization are reviewed and a future research direction is then proposed.
The Variation Factors of Severity-Adjusted Length of Stay in CABG
Kim, Sun-Ja ; Kang, Sung-Hong ; Kim, Won-Joong ; Kim, Yoo-Mi ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 391~399
Our study was carried out to analyze the variation factors of severity-adjusted length of stay(LOS) in coronary artery bypass graft(CABG). The subjects were 932 CABG inpatients of the Korean National Hospital Discharge In-depth Injury Survey from 2004 through 2008. The data were analyzed using
test and the severity-adjusted model was developed using data mining technique. The results of the study were as follows: male(71.1%), older than 61 years of age(61.6%), more than 500 beds(92.8%) and admitting via ambulatory care(70.0%) appeared to have higher rate than otherwise. In-hospital mortality of CABG inpatients was 2.8%. In addition, 46.4% of the patients received their care in other residence. The angina pectoris(45.6%) was found to be the highest in principle diagnosis, followed by chronic ischemic heart disease(36.9%) and acute myocardial infarction(12.0%). We developed severity-adjusted LOS model using the variables such as gender, age and comorbidity. Comparison of adjusted values in predicted LOS revealed that there were significant variations in LOS by location of hospital, bed size, and whether patients received the care in their residences. The variations of LOS can be explained as the indirect indicator for quality variation of medical process. It is suggested that the severity-adjusted LOS model developed in this study should be utilized as a useful method for benchmarking in hospital and it is necessary that national standard clinical practice guideline should be developed.
Practical designs for mixture component-process experiments
Lim, Yong-B. ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 400~411
Process variables are factors in an experiment that are not mixture components but could affect the blending properties of the mixture ingredients. For example, the effectiveness of an etching solution which is measured as an etch rate is not only a function of the proportions of the three acids that are combined to form the mixture, but also depends on the temperature of the solution and the agitation rate. Efficient designs for the mixture components-process variables experiments depend on the mixture components-process variables model which is called a combined model. We often use the product model between the canonical polynomial model for the mixture and process variables model as a combined model. In this paper we propose three starting models for the mixture components-process variables experiments. One of the starting model we are considering is the model which includes product terms up to cubic order interactions between mixture effects and the linear & pure quadratic effect of the process variables from the product model. In this paper, we propose a method for finding robust designs and practical designs with respect to D-, G-, and I-optimality for the various starting combined models and then, we find practically efficient and robust designs for estimating the regression coefficients for those models. We find the prediction capability of those recommended designs in the case of three components and three process variables to be good by checking FDS(Fraction of Design Space) plots.
QoS Analysis of a Distributed System Considering the Processing Time
Kim, Jung-Ho ; Park, Jong-Hun ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 412~421
In this paper, we introduce Quality of Service(QoS) analytic model of a distributed system that decentralizes the process nodes performing each task and communicates through a network for cooperation. The model advances a service reliability model of Dai et a1.(2003) by means of considering the processing time. The service is assumed to be provided by a centralized heterogeneous distributed system which is composed of some subsystems managed by a control center. The QoS is defined as the probability that a service is provided successfully in an allowed time, we consider the hardware/software reliability and the processing time which include program execution time, data transfer time. We derive the processing time distribution for a required service through convolution of corresponding probability density function. An application example is used to explain the procedure of computing quality of service.
Alternative Policies to Improve the Quality Level of Reverse Logistics Network for Used Mobile Phones
Jeong, Young-Bok ; Chung, Byung-Hee ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 422~431
The number of mobile telecommunication service subscribers has been over 50 millions as of the end of Nov. 2010. And the number of used mobile phones has been growing continuously caused by shortened life cycle of products and competing between service providers, which is about 21 millions for only one year, 2010 in Korea. However, the quality level of reverse logistics network for used mobile phones is very low and statistics show that the collection ratio of them has not been over 40%. The current low collection ratio can be one of the significant causes of environment destruction due to the cumulated growth. Accordingly new practical alternative recovery systems are required in addition to the current one with EPR(Extended Producers Responsibility). In this paper, suggested are alternative policies to improve the quality level of reverse logistics network for used mobile phones effectively. ENR(Extended Network service providers Responsibility) is representative of them.
Personal Information Protection Behavior for Information Quality : Health Psychology Theory Perspectives
Jee, Bum-Suk ; Fan, Liu ; Lee, Sang-Chul ; Suh, Yung-Ho ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 432~443
The purpose of this research is to understand users' information protection behavior on personal information security from health psychology theory perspectives. Empirical results indicate that users' information protection behavior on personal information is predicted by perceived threat and perceived responsiveness. Perceived threat is determined by perceived susceptibility and perceived severity. Perceived responsiveness is determined by response efficacy and self-efficacy, but response cost is not significant. These findings provide an enriched understanding about users' information protection behavior on personal information security.
An Empirical Study on the Influence of Business Performance by the Defense Quality Management System
Noh, Jae-Yong ; Ree, Sang-Bok ;
Journal of the Korean Society for Quality Management, volume 39, issue 3, 2011, Pages 444~460
We study on the Influence of Business Performance by the Defense Quality Management System(DQMS). In this paper, we establish the 7 hypothesis which is as following that Motivation of DQMS certificate and CEO leadership of DQMS certificate will affect the DQMS, DQMS will affect on Quality performance and Customer performance, Quality performance will affect on Customer performance, each of Quality performance and Customer performance will affect Business Performance. By empirical study, we prove all hypothesis is accepted. We hope this result to improve performance and DQMS of corporate which try to take DQMS certificate.