• Title, Summary, Keyword: quality control

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Optimal Learning Control Combined with Quality Inferential Control for Batch and Semi-batch Processes

  • Chin, In-Sik;Lee, Kwang-Soon;Park, Jinhoon;Lee, Jay H.
    • 제어로봇시스템학회:학술대회논문집
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    • pp.57-60
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    • 1999
  • An optimal control technique designed for simultaneous tracking and quality control for batch processes. The proposed technique is designed by transforming quadratic-criterion based iterative learning control(Q-ILC) into linear quadratic control problem. For real-time quality inferential control, the quality is modeled by linear combination of control input around target qualify and then the relationship between quality and control input can be transformed into time-varying linear state space model. With this state space model, the real-time quality inferential control can be incorporated to LQ control Problem. As a consequence, both the quality variable as well as other controlled variables can progressively reduce their control error as the batch number increases while rejecting real-time disturbances, and finally reach the best achievable states dictated by a quadratic criterion even in case that there is significant model error Also the computational burden is much reduced since the most computation is calculated in off-line. The Proposed control technique is applied to a semi-batch reactor model where series-parallelreactions take place.

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Computerization of Quality Information System Using Personal Computers (PC를 이용한 품질정보시스템의 전산화)

  • Park, Chul-Joo;Oh, Yon Woo
    • Journal of the Korean Society for Quality Management
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    • v.24 no.2
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    • pp.113-127
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    • 1996
  • A various quality data are produced during nuclear fuel fabrication. In order to control quality data efficiently, Computerization of Quality Information System(QIS) using personal computer was established. Database control software and analysis software were developed for QIS. QIS was applied the fuel manufacturing and quality inspection. Quality trend analysis, process control, process capability and quality history docket for nuclear fuel manufacturing were performed by QIS. Through the Quality Information System, quality assurance, quality control, process control and manufacturing engineering were performed efficiently in nuclear fuel manufacturing.

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An Dynamic Analysis of Quality Control in Korean Manufacturing Industry (한국제조기업 품질관리활동의 동적 분석)

  • 이순룡;이광재
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.10 no.16
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    • pp.183-195
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    • 1987
  • The effectiveness of quality control is contingent to adaptability to the present circumstance. The objectives of this study are to provide empirical data to carry out qualify control effectively. To accomplish this purpose, an empirical study was made by questionaire (mailing survey method, Feb. to Mar. in 1987). The sample is the 167 companies in Korean manufacturing industry. The main findings out of the analysis are as follows the stage of quality control is concentrated in appraisal phase, the company standard is equiped gradually in non-KS marked company and the need of economic evaluation about quality control is increased gradually. With a view to analysing of relationship between quality control and it's effect factors (company standard, KS mark, computer based information system), the methods of $\chi$$^2$ test are used. The company standard have a significant difference in top manager's altitude to duality control, operation stage of quality control. operation scope of qualify control and quality budgeting system but is insignificant with economic evaluation about duality control. Otherwise, KS mark is insignificant with the equality control activity except for operation scope. The quality information system based in computer have a significant difference in operation stage, operation scope and economic evaluation. Therefor, for the purpose of attaining effectiveness of quality control through the economic evaluation about quality control, the company standard and computer based duality information system must be utilized in quality control activity.

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A Study on Establishment and Control of the Quality Control Policy (품질관리 방침의 설정과 관리에 관한 소고)

  • 이상억
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.8 no.11
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    • pp.35-43
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    • 1985
  • In this paper we will concentrate on the Quality Control Policy which should be enforced as a part of the Total Quality Control considers the global concepts, the establishment Procedures, and the evolution and operation of Quality control policy to achieve effectively it. For enforcement of the Qualify control policy shall be focused for considerations : (1) suggestion of the optimum control policy (2) suggestion of a comprehensive plan and promoting method quality control (3) suggestion of matters that need special consideration at the time of decision of a comprehensive management of control policy thereof. (4) A comprehensive Proposal (5) suggestion of a plan for progress of the Quality control system and the supplementary plan In the future, accordingly, establishment d its own policy control level is desirably more reasonable, and the Total Quality Control System that employes the control efficiency of periodical and systematic and rationalization and radical reform of the enterprise management problem as the restrictive conditions must be applied for quality control system.

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The SCM Characteristics and Relationship Control on RTE Characteristics (SCM 특성과 관계통제가 RTE 특성에 미치는 영향)

  • Park, Kwang O;Jun, Jong-Hyun;Chang, Hwal-Sik
    • The Journal of Information Systems
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    • v.23 no.4
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    • pp.25-47
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    • 2014
  • The purpose of this study is to identify and comprehensively explain the SCM-related factors involved in the realization of RTE, including the quality of information concerning SCM, the quality of SCM partnerships, and relationship controlling factors (planning control, behavioral control, and outcome control). This study systematizes the interactions among these factors into a form of a model, elucidating how these interactions affect and shape RTE characteristics. To validate the research model proposed in the study, filed survey was conducted with 79 staffs in Korean company using SCM. The findings of the study can be summarized as follows: First, the quality of information concerning SCM had significant effect on the quality of SCM partnerships, planning control, behavioral control, and outcome control. Not only does the quality of SCM information directly influence the quality of SCM partnerships, planning control, behavioral control, and outcome control; but it also indirect influence on forecasting, agility, and visibility of SCM though its influence on the different forms of relationship control. Second, the quality of SCM partnerships also had significant effect on planning control, behavioral control, and outcome control. In addition to directly influencing these forms of relationship control, the quality of SCM partnerships also indirectly influenced forecasting, agility, and visibility though its influence on relationship control. Third, planning control significantly influenced forecasting, agility and visibility. Fourth, behavioral control significantly influenced forecasting, but neither agility nor visibility. Fifth, outcome control had significant influence on forecasting, agility, and visibility.

Design of Intelligent Material Quality Control System based on Pattern Analysis using Artificial Neural Network (인공 신경망의 패턴분석에 근거한 지능적 부품품질 관리시스템의 설계)

  • 이장희;유성진;박상찬
    • Journal of the Korean Society for Quality Management
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    • v.29 no.4
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    • pp.38-53
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    • 2001
  • In resolving industrial quality control problems, a vector of multiple quality characteristic variables is involved rather than a single variable. However, it is not guaranteed that a multivariate control chart based on statistical methods can monitor abnormal signal in case that small changes of relationship between each variables causes abnormal production process. Hence a quality control system for real-time monitoring of the multi-dimensional quality characteristic vector under a multivariate normal process is needed to enhance tile production system quality performance. A pattern analysis approach based on self-organizing map (SOM), an unsupervised learning technique of neural network, is applied to the design of such a quality control system. In this study we present a new material quality control system based on pattern analysis approach and illustrate the effectiveness of proposed system using actual electronic company material data.

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A Survey on Recognition of Quality Control of Oriental Medicines by People Who Work in Field of Oriental Medicine (한약재 품질관리에 관한 인식도 조사연구)

  • Chun Jin-Mi;Lee A-Young;Jeon Won-Kyung;Choo Byung-Kil;Lee Hye-Won;Kim Hong-Jun;Kim Ho-Kyoung
    • The Journal of Korean Medicine
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    • v.27 no.2
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    • pp.111-121
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    • 2006
  • Objectives : The purpose of this study was to identify attitude, treatment and quality control of Oriental medicines and to find the influencing factors affecting them. Methods : We made a survey of 213 people who work in the field of Oriental medicine in Daegu. A survey on attitudes about treatment, and quality control of Oriental medicines was conducted by mail. The data was analyzed by SPSS. Results : The survey results showed that most common purchase place for Oriental medicine was a wholesale market (67.0%). Storage of Oriental medicine was mostly in warehouse (61.4%) without temperature controls. Subjects expressed necessity for quality control (100%), legal controls (96.2%), grading according to quality (95.7%), and standardization of Oriental medicine (90.6%) at a high rate. Conclusions : These results showed that subjects were interested in quality control of Oriental medicine to ensure safety.

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Improvement Plan of Quality Control for 3D Geospatial Database (3차원 국토공간정보 품질관리 개선방안에 관한 연구)

  • Seo, Chang-Wan;Choi, Yun-Soo;Kim, Jae-Myeong;Kim, Young-Hak;Kim, Young-Gil
    • Spatial Information Research
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    • v.17 no.2
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    • pp.231-241
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    • 2009
  • Recently, The importance of a quality control for implementing 3D geospatial database has being emphasized to build a 21st century knowledge society and an ubiquitous land. The improvement of 3D geospatial database quality control through establishing an integrated quality control makes data suppliers update data efficiently and users get high quality data. The purpose of this study was to derive the improvement plan of 3D geospatial database quality control through the analyses of the existing 3D geospatial database quality control and case studies. The results of this study are as follows. Firstly, we defined the concept of 3D geospatial database quality control. Secondly, we set the boundary, factors and process of 3D geospatial database quality control through classifying it in detail. Lastly, we drew improvement contents such as the quality control checklist by implementation process according to the improvement plan of 3D geospatial database implementation.

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A Study on Method for software Quality control (소프트웨어 품질관리 방법에 관한 연구)

  • Im Dae-Heug;Jang Young-Suk
    • Management & Information Systems Review
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    • v.15
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    • pp.245-262
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    • 2004
  • As the competition between countries has become higher and the notion of software quality has been widely spread. it has been necessary to develop technologies that can ensure and produce high quality software. With the advent of information-oriented society. quality control has to transfer to the quality control activities focused on software system instead of those activities focused on hardware system. If so, how do we get to handle the quality control on the basis of the new approach. Also, as software applications have grown, so too has the importance of software quality. In order to manage software quality, the technology to specify and evaluate both the software product quality and development process quality objectively quantitatively is most important. To produce products of good quality, we need a more progressive quality control system according to the need of software development life cycle. In other words, we do software right the first time or build quality in the process. On the basis intermediate and final time or build quality in the process. On the basis of data achieved, we can evaluate the products according to the consequences of the data, What are the problems to contrive the software quality control system?, we con promote the quality of products. To achieved that goal, we con provide a suitable the technique and method of software quality control.

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Literature Review on the Statistical Quality Control in Journal of the KSQM for 50 Years (품질경영학회지 50주년 특별호: 통계적품질관리 분야 연구 리뷰)

  • Kwon, Hyuck Moo;Hong, Sung Hoon;Lee, Min Koo;Lim, Sung Uk
    • Journal of the Korean Society for Quality Management
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    • v.44 no.1
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    • pp.1-16
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    • 2016
  • Purpose: This paper reviews the papers on statistical quality control issues which are published in Journal of the Korean Society for Quality Management (KSQM) since 1965. The literature review is purposed to survey a variety of statistical quality control issues. Methods: By grouping all of statistical quality control issues into 3 categories:; quality inspections, control charts, and process capability analysis. Results: Grouping all of papers on statistical quality control published in journal of the KSQM for 50 years into 3 categories, we provide a chronological roadmap for individual categories, and summarize the contents and contributions of surveyed papers. Conclusion: The review paper is expected to provide future direction to improve statistical quality control theories and applications in manufacturing and service industries.