Results 61 to 70 of about 892 (180)

Waiting Time Control Chart for M/G/1 Retrial Queue

Computation
Retrial queues are used extensively to model many practical problems in service systems, call centers, data centers, and computer network systems. The average waiting time is the main observable characteristic of the retrial queues. Long queues may cause
Yih-Bey Lin, Tzu-Hsin Liu, Yu-Cheng Tsai, Fu-Min Chang   +3 more
doaj   +1 more source

Design of a Control Chart Using Extended EWMA Statistic

Technologies, 2018
In the present paper, we propose a control chart based on extended exponentially weighted moving average (EEWMA) statistic to detect a quick shift in the mean. The mean and variance expression of the proposed EEWMA statistic are derived.
Muhammad Naveed, Muhamma Azam, Nasrullah Khan, Muhammad Aslam   +3 more
doaj   +1 more source

A Literature Review on the Fuzzy Control Chart; Classifications & Analysis [PDF]

International Journal of Supply and Operations Management, 2014
Quality control plays an important role in increasing the product quality. Fuzzy control charts are more sensitive than Shewhart control chart. Hence, the correct use of fuzzy control chart leads to producing better-quality products. This area is complex
Mohammad Hossein Zavvar Sabegh, Ablofazl Mirzazadeh, Saber Salehian, Gerhard Wilhelm Weber   +3 more
doaj   +1 more source

The Application of Six Sigma to Assess the Analytical Performance of Plasma Proteins and Design a Risk‐Based Statistical Quality Control Strategy: A Multicenter Study

Journal of Clinical Laboratory Analysis, Volume 39, Issue 16, August 2025.
The six sigma model can objectively assess the analytical performance of plasma proteins. Different control concentrations yield different sigma values, which are visually displayed through standardized sigma performance verification charts. The six sigma model enables the development of personalized quality control strategies for each assay.
Ming Hu, Jiaping Wang, Huan Yang, Sugang Zang, Tingting Gao, Jian Zeng, Fumeng Yang   +6 more
wiley   +1 more source

Shewhart’s Control Chart: Some Observations

, 1999
Data Analysis in Shewhart’s Control Chart, to use the original m samples n sized intensities, is the main subject of this paper. Given m × n intensities we examine three alternatives to sintetize the variability: a) arithmetic mean of m standard deviations (' S); b) root mean square of m variances (" S); c) global dispersion ("" S).
openaire   +3 more sources

Long‐term stability analysis of beam shape in a robotic radiosurgery system

Journal of Applied Clinical Medical Physics, Volume 26, Issue 7, July 2025.
Abstract Purpose This study aimed to investigate the long‐term stability of CyberKnife beam profile parameters and assess their compliance with existing quality assurance (QA) guidelines. We evaluated beam profiles in both standard and diagonal planes over 3.5 years post‐installation to detect potential issues and ensure consistent beam quality.
Ryoichi Hinoto, Shiho Kashiyama, Takahisa Eriguchi, Nobuhiro Tsukamoto, Takeji Sakae   +4 more
wiley   +1 more source

A Practical Approach to Implementing ICH Q14: Tools for Analytical Quality by Design in Capillary Electrophoresis Method Development

ELECTROPHORESIS, Volume 46, Issue 13-14, Page 933-953, July 2025.
ABSTRACT The ICH Q14 guideline introduces a structured framework for analytical method development based on Analytical Quality by Design (AQbD) principles, aiming to ensure robust, reliable, and fit‐for‐purpose methods throughout the product lifecycle.
Ewoud van Tricht, Cari E. Sänger ‐ van de Griend   +1 more
wiley   +1 more source

A Spatiotemporal Scheme for Process Control Using Image Analysis of Speckle Patterns

Quality and Reliability Engineering International, Volume 41, Issue 5, Page 1773-1788, July 2025.
ABSTRACT Conventional image‐based process control schemes require distinct, detectable features (e.g., edges or textures). In the absence of such features, current methods fail or require additional preprocessing. They are also prone to false detections from random noise, dirt, or scratches on the surface.
Hamed Sabahno, Davood Khodadad
wiley   +1 more source

THE MIXED UNIVARIATE CONTROL CHART EWMA AND CUSUM FOR FLAVOUR PRODUCTION QUALITY PROCESS MONITORING

Jurnal Matematika UNAND
A control chart is an important statistical technique used to monitor the average quality of a process or dispersion. Shewhart control chart is used to detect larger disturbances in process parameters.
Surya Puspita Sari, Maiyastri Maiyastri, Dodi Devianto   +2 more
doaj   +1 more source

A New Dispersion Control Chart for Handling the Neutrosophic Data

IEEE Access, 2020
The control chart based on mean deviation (MD ) is customary used as a robust alternative to the existing Shewhart control charts for observing changes in dispersion parameter of the process.
Zahid Khan, Muhammad Gulistan, Wathek Chammam, Seifedine Kadry, Yunyoung Nam   +4 more
doaj   +1 more source