Results 241 to 250 of about 154,355 (274)

A Mixed EWMA–CUSUM Control Chart for Weibull‐Distributed Quality Characteristics

Quality and Reliability Engineering International, 2016
The control charts have been widely used for process monitoring. Shewhart control chart has ability to detect large disturbances in the process. The EWMA and CUSUM charts have ability to detect a small change in the manufacturing process. In this paper, we will design a mixed EWMA–CUSUM control chart for Weibull‐distributed quality characteristics. The
Muhammad Aslam
exaly   +2 more sources

MODELING THE EVOLUTION OF THE PERFORMANCE OF A SENSORY PANEL: A MIXED‐MODEL AND CONTROL CHART APPROACH

Journal of Sensory Studies, 2007
ABSTRACT A sensory panel is often used to profile the same type of product with the same set of attributes for many years. We are interested in characterizing the evolution of the performance of such a panel (and its panelists) over time. This article presents a methodology based on a mixed‐model approach that takes into account the evolution of both ...
Pineau, Nicolas, Chabanet, Claire, Schlich, Pascal   +2 more
openaire   +4 more sources

Multivariate semiparametric control charts for mixed-type data

Statistical Methods in Medical Research, 2023
A useful tool that has gained popularity in the Quality Control area is the control chart which monitors a process over time, identifies potential changes, understands variations, and eventually improves the quality and performance of the process.
Elisavet M Sofikitou, Marianthi Markatou, Markos V Koutras   +2 more
openaire   +2 more sources

On developing sensitive nonparametric mixed control charts with application to manufacturing industry

Quality and Reliability Engineering International, 2021
AbstractControl charts are designed under the normality assumption of the quality characteristic of the process. However, the normality assumption rarely holds in practice. In non‐normal conditions, parametric charts tend to display more false alarm rates and invalid out‐of‐control comparisons.
Saber Ali, Zameer Abbas, Hafiz Zafar Nazir, Muhammad Riaz 0001, Xingfa Zhang, Yuan Li   +5 more
openaire   +1 more source

On Designing Mixed Nonparametric Control Chart for Monitoring the Manufacturing Processes

Arabian Journal for Science and Engineering, 2021
Efficient control charts are used to maintain and improve the manufacturing, industrial and service processes. Control chart is a basic tool of quality practitioners for producing products that meet market requirements in terms of quality, reliability and functionality. Lack of normality is a common occurrence in these processes.
Saber Ali, Zameer Abbas, Hafiz Zafar Nazir, Muhammad Riaz, Xingfa Zhang, Yuan Li   +5 more
openaire   +1 more source

On a class of mixed EWMA‐CUSUM median control charts for process monitoring

Quality and Reliability Engineering International, 2020
AbstractMonitoring of any manufacturing, production, or industrial process can be controlled and improved by removing these special cause of variations using control charts. Shewhart‐type control charts are effective to control a large amount of special variations, whereas, cumulative sum (CUSUM) and exponentially weighted moving average (EWMA) charts ...
Shahid Hussain 0005, Xiaoguang Wang 0006, Shabbir Ahmad, Muhammad Riaz 0001   +3 more
openaire   +1 more source

Distribution-free Mixed CUSUM-MA Control Chart to Detect Mean Shifts

Lobachevskii Journal of Mathematics
Yupaporn Areepong, Saowanit Sukparungsee, Areepong Yupaporn   +2 more
exaly   +2 more sources

Mixed CUSUM-EWMA chart for monitoring process dispersion

International Journal of Advanced Manufacturing Technology, 2016
Every industrial process has to encounter two types of variation in product characteristic(s) that can be classified as common and special cause variations.
Babar Zaman, Nasir Abbas, Muhammad Riaz   +2 more
exaly   +1 more source

On mixed memory control charts based on auxiliary information for efficient process monitoring

Quality and Reliability Engineering International, 2020
AbstractControl charts are popular monitoring tools in statistical process control toolkit. These are used to identify assignable causes in the process parameters (location and/or dispersion). These assignable causes result in a shift in the process parameter(s). The shift can be categorized into three sizes (small, moderate, and large). Memory control
Syed Masroor Anwar, Muhammad Aslam 0008, Muhammad Riaz 0001, Babar Zaman   +3 more
openaire   +1 more source

A mixed GWMA–CUSUM control chart for monitoring the process mean

Communications in Statistics - Theory and Methods, 2017
ABSTRACTThe memory-type control charts are widely used in the process and service industries for monitoring the production processes. The reason is their sensitivity to quickly react against the small process disturbances. Recently, a new cumulative sum (CUSUM) chart has been proposed that uses the exponentially weighted moving average (EWMA) statistic,
Rizwan Ali, Abdul Haq
openaire   +1 more source