• Title/Summary/Keyword: Process adjustment

Search Result 850, Processing Time 0.029 seconds

A study on the theory for Integrating of Statistical Process Control and Process Adjustmen (통계적 공정관리와 공정조절의 통합을 위한 이론에 대한연구)

  • Jung, Hae-Woon
    • Proceedings of the Safety Management and Science Conference
    • /
    • 2005.11a
    • /
    • pp.493-504
    • /
    • 2005
  • Statistical Process Control and Process Adjustment theory is gaining recognition in the process industries where the process frequently experiences a shift mean. This paper aims to study, the theory difference between Statistical Process Control and Process Adjustment in simple terms and presents a case study that demonstrates successful integration of Statistical Process Control and Process Adjustment theory for a product in drifting industry.

  • PDF

A Generalization of the Discrete Feedback Adjustment by Rational Subgrouping

  • Park, Changsoon;Moonsup Song;Lee, Jaeheon
    • Journal of the Korean Statistical Society
    • /
    • v.27 no.2
    • /
    • pp.237-249
    • /
    • 1998
  • Process adjustment has been widely used in production processes in order to set the output characteristic as close as to the target. Box and Kramer(1992) developed a feedback adjustment control procedure for process adjustment. We generalize their procedure by using a rational subgrouping of sequential observations. In this paper the feedback control rule of the rational subgrouping is proposed and the overall expected cost is evaluated. Also properties of the proposed control scheme are illustrated and compared to Box and Kramer's in the context of the expected cost.

  • PDF

Problems of Special Causes in Feedback Adjustment

  • Lee, Jae-June;Cho, Sin-Sup
    • Journal of Korean Society for Quality Management
    • /
    • v.32 no.2
    • /
    • pp.201-211
    • /
    • 2004
  • Process adjustment is a complimentary tool to process monitoring in process control. Process adjustment directs on maintaining a process output close to a target value by manipulating another controllable variable, by which significant process improvement can be achieved. Therefore, this approach can be applied to the 'Improve' stage of Six Sigma strategy. Though the optimal control rule minimizes process variability in general, it may not properly function when special causes occur in underlying process, resulting in off-target bias and increased variability in the adjusted output process, possibly for long periods. In this paper, we consider a responsive feedback control system and the minimum mean square error control rule. The bias in the adjusted output process is investigated in a general framework, especially focussing on stationary underlying process and the special cause of level shift type. Illustrative examples are employed to illustrate the issues discussed.

Problems of Special Causes in Feedback Adjustment

  • Lee Jae June;Cho Sinsup;Lee Jong Seon;Ahn Mihye
    • Proceedings of the Korean Society for Quality Management Conference
    • /
    • 2004.04a
    • /
    • pp.425-429
    • /
    • 2004
  • Process adjustment Is a complimentary tool to process monitoring in process control. Process adjustment directs on maintaining a process output close to a target value by manipulating another controllable variable, by which significant process improvement can be achieved. Therefore, this approach can be applied to the 'Improve' stage of Six Sigma strategy. Though the optimal control rule minimizes process variability in general, it may not properly function when special causes occur in underlying process, resulting in off-target bias and increased variability in the adjusted output process, possibly for long periods. In this paper, we consider a responsive feedback control system and the minimum mean square error control rule. The bias in the adjusted output process is investigated in a general framework, especially focussing on stationary underlying process and the special cause of level shift type. Illustrative examples are employed to illustrate the issues discussed.

  • PDF

A Study on Multicultural Family Children' Early Adjustment Process to Daily Life in the Kindergarten (다문화가정 유아의 유치원생활 초기적응과정에 대한 연구)

  • Oh, Jae-Yeon;Nam, Min-Woo;Kim, Kyang-Ran
    • Journal of Agricultural Extension & Community Development
    • /
    • v.19 no.1
    • /
    • pp.95-127
    • /
    • 2012
  • The objective of this study was to examine multicultural family children's adjustment process to kindergarten and differences in their adjustment among time points. For these purpose, we conducted interviews and a questionnaire survey with teachers in charge of 3-5-year-old young children from multicultural families at public and private kindergartens in Gwangju, Jeollanamdo and Daejeon. According to the results of this study, multicultural family children adjusted themselves to kindergarten through four weeks' daily life in the kindergarten. In daily work adjustment, they showed some difficulty in Week 2 but their adjustment improved rapidly in Week 3 and Week 4. Self adjustment and peer adjustment also improved notably in Week 3 and Week 4. In pro-social adjustment, the children showed difficulty in Week 2, improvement in Week 3, and again difficulty in Week 4. These results suggest that, by responding to the teacher's sensitivity and intimacy, young children in multicultural families have a pattern of adjustment similar to that of young children in Korea families.

The Adjustment of Patients with Hemophilia (혈우병 환자의 적응과정)

  • Kim, Won-Ock
    • Korean Journal of Adult Nursing
    • /
    • v.14 no.4
    • /
    • pp.635-644
    • /
    • 2002
  • Purpose: This research was done to establish a theoretical foundation for the adjustment process of patients with hemophilia. Method: For this study, 14 patients with hemophilia participated. The data was collected through the in-depth interviews and analysed in terms of Strauss and Corbin's grounded theory methodology. Result: The core category was identified with "uncertainty". The adjustment process was classified into two stages: the 'unstable stage' before the moment they learn about the Hemophilia Foundation and the 'stable stage' since then. The two stages were further divided into four groups, namely 'the stage of isolation ', 'the stage of maintaining survival', 'the stage of pursuing hope', 'the stage of ambivalence'. The categories of these stages include a series of subcategories to describe the adjustment of patients. The quality of life for these patients has increasingly improved based on support from hemophiliac organizations. But due to the uncertainty of disease, the patients have four stages of adjustment process from the stage of isolation to that of ambivalence and might turn to feedback. Conclusion: Therefore the nursing interventions reflecting adjustment process of patients with hemophilia should be developed.

  • PDF

A Qualitative Study on the Adjustment of Separated Families in South and North Korea : Focusing on Separated Families Living in South Korea (남북이산가족의 적응에 관한 질적 고찰 : 남한 거주 이산가족을 중심으로)

  • Choi, Youn-Shil
    • Journal of Families and Better Life
    • /
    • v.25 no.1 s.85
    • /
    • pp.183-207
    • /
    • 2007
  • The purpose of this study was to improve the understanding of the essential experience of Separated Families in South and North Korea in a socio-cultural context and to explore their post-separation adjustment process from the perspective of the families. Major findings in this study are summarized as follows. First, 'han' was the central phenomenon that the participants experienced following their separation. Second, the core issue in the process of post-separation adjustment was 'accepting the separation and rearrangement of reality for reunion', and over time the participants went through four stages in their adjustment process: the stage of being overwhelmed, the stage of conflict, the stage of awareness, and the stage of acceptance. Third, the main factors affecting the participants' adjustment were supportive systems, available resources(individual variables) and interaction with other separated families. fourth, four types were observed in the typology of adjustment and reunion of the participants.

런규칙을 사용한 개량된 경계선 수정계획의 설계와 Markov 연쇄의 적용

  • 박창순
    • Proceedings of the Korean Society for Quality Management Conference
    • /
    • 2004.04a
    • /
    • pp.413-418
    • /
    • 2004
  • The bounded adjustment is known to be more efficient than repeated adjustment when the cost is incurred for engineering process control. The procedure of the bounded adjustment is to adjust the process when the one-step predicted deviation exceeds the adjustment limit by the amount of the prediction. In this paper, two run rules are proposed and studied in order to improve the efficiency of the traditional bounded adjustment procedure. The efficiency is studied in terms of the standardized cost through Monte Carlo simulation when the procedure is operated with and without the run rules. The adjustment procedure operated with run rules turns out to be more robust for changes in the process and cost parameters. The Markov chain approach for calculating the properties of the run rules is also studied.

  • PDF

The Rationalization of Contract Sum Adjustment through Case Study of Price Fluctuation Adjustment based on Index Adjustment Method (물가변동조정 사례분석을 통한 지수조정방법기반 계약금액조정 합리화방안)

  • Kim, Seong-Hee
    • Korean Journal of Construction Engineering and Management
    • /
    • v.12 no.4
    • /
    • pp.70-78
    • /
    • 2011
  • In case of long time progressive construction work, we need contract sum adjustment due to escalation for a period of works and the process of applying, consistent and obvious criterion is required. In this study, it were attempted to figure out problem and study this rational improvement by giving examples based on core activities of escalation adjustment. Based on literature study and legal system analysis, we classified processes of contract sum adjustment for escalation and defined 20 core activities for each process. From this measured variable, we carried out case study by giving 37 examples of escalation. As a result of case study, problems of each process was found and we suggested rational improvement. As this study, providers will be able to waste budget and the other will be given smooth escalation adjustment.

Impact of Special Causes on First-Order System Feedback Process Adjustment (First-Order System 피드백 공정 조정에서 이상원인의 영향)

  • Jun, Sang-Pyo
    • Journal of the Korea Safety Management & Science
    • /
    • v.9 no.5
    • /
    • pp.49-55
    • /
    • 2007
  • A special cause producing temporary deviation in the underlying process can influence on process adjustment in First-Order System feedback control system. In this paper, the impact of special causes on the forecasts and the process adjustment that is based on the EWMA forecasts are derived for a first-order system. For some special causes with patterned type of contamination, the influence of the causes on the output process are explicitly investigated. A data set, contaminated by a special cause of level shift, is analyzed to confirm the impact numerically.