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process capability analysis AND ESTIMATION SCHEME FOR AUTOCORRELATED DATA

Journal of Systems Science and Systems Engineering 2010年第1期19卷 105-127页

作者： Jing SUN Shengxian WANG Zhihui FU Research Center for Contemporary Management,Key Research Institute of Humanities and Social Sciences at Universities,School of Economics and Management,Tsinghua University,Beijing 100084,P.R.China Research Center for Contemporary Management Key Research Institute of Humanities and Social Sciences at Universities School of Economics and Management Tsinghua University Beijing P.R. China

Autocorrelation is prevalent in continuous production processes, such as the processes in the chemical and pharmaceutical industries. With the development of measurement technology and data acquisition technology, sampling frequency is getting higher and the existence of autocorrelation cannot be ignored. This paper analyzes five estimation schemes of process capability for autocorrelated data. Comparisons among these schemes are discussed for small sample and large sample. In conclusion, this paper gives a procedure of process capability analysis for autocorrelated data.

关键词： Autocorrelation estimation process capability analysis statistical process control

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process capability analysis of Delivering Neonatal Care with Normal Weight （Case Study of Neonatal Weight Data at a Maternity Clinic in Banjarmasin）

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Journal of Life Sciences 2011年第12期5卷 996-1002页

作者： Dewi Anggraini Department of Mathematics Faculty of Mathematics and Natural Sciences University of Lambung Mangkurat Banjarmasin SouthKalimantan 70714 Indonesia

Statistical Quality Control （SQC） is used to analyze and monitor quality characteristic measurements of normal neonatal weight in a maternity clinic in Banjarmasin in this paper. The objective of this study is to assist medical practitioners in observing pregnant women to deliver their babies with normal weight. It is also assumed that pregnant women who delivered their babies in the clinic have been monitored during their nine-month pregnancy. Thus, they can manage their own pregnancy to deliver normal weight babies. The use of Statistical process Control （SPC） tools, such as frequency histogram, probability plot, and the implementation of Shewhart, R, and S control charts as primary techniques, are presented to display the monitoring aspects of the process. In addition, process capability analysis （PCA） is performed to ensure that the process outcomes are capable of meeting certain requirements or specifications. The process capability Ratio （PCR） for the process is also presented. This analysis is an essential part of an overall quality improvement program.

关键词： process capability analysis Shewhart control chart R-chart normal neonatal weight.

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Research on Factors Affecting Boiler Feedwater Quality and Its Improvement

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Open Journal of Applied Sciences 2022年第6期12卷 901-911页

作者： Hongmei Pan Xiaomin Xu Business School Shanghai Dianji University Shanghai China

Nowadays, with the rapid progress and development of the Chinese society, people’s material level has been continuously improved, and the demand for electricity has also been increasing year by year. For thermal power plants, it is of great importance to strictly control the feedwater quality and to conduct real-time tracking and supervision, as well as to ensure the safety of the production process. In this paper, we take the boiler feedwater quality in the production process as the research object. First of all, the cause-and-effect diagram is used to find out the reasons for the deviation of feedwater quality;Secondly, each index of feedwater is analyzed by multiple linear regression method to find out the key variables affecting the change of its pH value, so as to develop and implement improvement measures;Finally, the pH value is compared and verified by control chart and process capability analysis, and relevant improvement suggestions and countermeasures are proposed.

关键词： Water Quality Multiple Linear Regression Control Chart process capability analysis

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