Quality and Reliability Engineering International
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A Wiener degradation process with drift‐based approach of determining target reliability index of concrete structuresAbstract In this paper, a novel approach is proposed to determine target reliability index based on modeling performance degradation of concrete structures as a stochastic process. First, the Wiener process with drift is used to simulate the degradation process of relative dynamic elastic modulus of concrete, and the drift coefficient and diffusion coefficient of Wi... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 38 Số 7 - Trang 3710-3725 - 2022
Preventive maintenance policy of single‐unit systems based on shot‐noise processAbstract This paper develops reliability and maintenance models for a single‐unit system subject to hard failures under random environment of external shocks. Motivated by the observations of shot‐noise process in practice, the impact of shock damage on system failure behavior is characterized by random hazard rate increments. To remove such negative impact, imperfe... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 35 Số 2 - Trang 550-560 - 2019
Estimating the Change Point of a Poisson Rate Parameter with a Linear Trend DisturbanceAbstract Knowing when a process changed would simplify the search and identification of the special cause. In this paper, we compare the maximum likelihood estimator (MLE) of the process change point designed for linear trends to the MLE of the process change point designed for step changes when a linear trend disturbance is present. We conclude that the MLE of the ... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 22 Số 4 - Trang 371-384 - 2006
A clustering approach to identify the time of a step change in Shewhart control chartsAbstract Control charts are the most popular statistical process control tools used to monitor process changes. When a control chart indicates an out‐of‐control signal it means that the process has changed. However, control chart signals do not indicate the real time of process changes, which is essential for identifying and removing assignable causes and ultimately... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 24 Số 7 - Trang 765-778 - 2008
A change point method for linear profile dataAbstract We propose a change point approach based on the segmented regression technique for testing the constancy of the regression parameters in a linear profile data set. Each sample collected over time in the historical data set consists of several bivariate observations for which a simple linear regression model is appropriate. The change point approach is based... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 23 Số 2 - Trang 247-268 - 2007
Estimating the Change Point of the Process Fraction Non‐conforming with a Monotonic Change Disturbance in SPCAbstract Knowing when a process has changed would simplify the search for and identification of the special cause. In this paper, we propose a maximum‐likelihood estimator for the change point of the process fraction non‐conforming without requiring knowledge of the exact change type a priori . Instead, we assume the type of change present ... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 23 Số 3 - Trang 327-339 - 2007
A magnitude‐robust control chart for monitoring and estimating step changes for normal process meansAbstract Statistical process control charts are intended to assist operators of a usually stable system in monitoring whether a change has occurred in the process. When a change does occur, the control chart should detect it quickly. If the operator can also be provided information that aids in the search for the special cause, then critical off‐line time can be sav... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 18 Số 6 - Trang 429-441 - 2002
On‐line Identification and Quantification of Mean Shifts in Bivariate Processes using a Neural Network‐based ApproachAbstract Many statistical process control (SPC) problems are multivariate in nature because the quality of a given process or product is determined by several interrelated variables. Various multivariate control charts (e.g. Hotelling's $T^2$ hiện toàn bộ
Quality and Reliability Engineering International - Tập 23 Số 3 - Trang 367-385 - 2007
Fault Diagnosis in Multivariate Control Charts Using Artificial Neural Networks
Quality and Reliability Engineering International - Tập 21 Số 8 - Trang 825-840 - 2005
Development of a Rapid Prototyping System using Response Surface MethodologyAbstract This case study presents an investigation of the relationships between eight process operating variables (factors) and five part performance measures (responses) in a rapid prototyping system. The use of fractional factorial, single‐factor foldover, and central composite designs is demonstrated. Polynomial regression models are constructed for each response... ... hiện toàn bộ
Quality and Reliability Engineering International - Tập 22 Số 8 - Trang 919-937 - 2006
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