Quality Technology and Quantitative Management最新文献_第8页

Robust economic design of NP-chart under different process and economic parameters scenarios 不同工艺和经济参数情景下np图的稳健经济设计

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-06-07 DOI: 10.1080/16843703.2022.2072632

A. Attia, M. A. Abdel-Aal

引用次数: 2

Monitoring the multivariate coefficient of variation in presence of autocorrelation with variable parameters control charts 用可变参数控制图监测存在自相关的多变量变异系数

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-06-01 DOI: 10.1080/16843703.2022.2075193

H. Sabahno, G. Celano

{"title":"Monitoring the multivariate coefficient of variation in presence of autocorrelation with variable parameters control charts","authors":"H. Sabahno, G. Celano","doi":"10.1080/16843703.2022.2075193","DOIUrl":"https://doi.org/10.1080/16843703.2022.2075193","url":null,"abstract":"ABSTRACT The coefficient of variation is a very important process parameter in many processes. A few control charts have been considered so far for monitoring its multivariate counterpart, i.e., the multivariate coefficient of variation (MCV). In addition, autocorrelation is very likely to occur in processes with high sampling frequency. Hence, designing suitable control charts and investigating the effect of autocorrelation on these charts is necessary. However, no control chart has been developed so far for the coefficient of variation that is capable of accounting for autocorrelation in either univariate or multivariate cases. This paper fills the gap by developing multivariate Shewhart-type control charts to monitor MCV with different autocorrelation structures for the observations: vector autoregressive, vector moving average, and vector mixed autoregressive and moving average. In addition, we add variable parameters adaptive features to the Shewhart-type scheme, in order to improve its performance. We develop a Markov chain model to get the statistical performance measures; then, we perform extensive numerical analyses to evaluate the effect of autocorrelation on adaptive and non-adaptive charts in the presence of downward and upward MCV shifts. Finally, we present an illustrative example from a healthcare process to show the implementation of this scheme in real practice.","PeriodicalId":49133,"journal":{"name":"Quality Technology and Quantitative Management","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48102166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Mechanism equivalence analysis for accelerated degradation tests based on tweedie exponential dispersion process 基于指数离散过程的加速降解试验机理等效分析

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-05-18 DOI: 10.1080/16843703.2022.2071536

Han Wang, Xiaobing Ma, Rui Bao, K. Zhou

{"title":"Mechanism equivalence analysis for accelerated degradation tests based on tweedie exponential dispersion process","authors":"Han Wang, Xiaobing Ma, Rui Bao, K. Zhou","doi":"10.1080/16843703.2022.2071536","DOIUrl":"https://doi.org/10.1080/16843703.2022.2071536","url":null,"abstract":"ABSTRACT Mechanism equivalence analysis, focusing on the underlying quantitative relationship between degradation model parameters under different stress levels when the accelerated failure mechanism remains unchanged, has been developed and adopted widely in accelerated degradation tests (ADTs) over recent years. For a specific degradation process, the mechanism equivalence conditions can be derived based on the acceleration factor invariant principle and further utilized to test whether the accelerated failure mechanism remains unchanged or not under different stress levels. In this paper, a unified form of the mechanism equivalence conditions for commonly-used stochastic process models is derived based on Tweedie exponential dispersion process. The unified form can cover the conditions of Wiener, Gamma and inverse Gaussian processes, etc. Based on this, a complete procedure for mechanism equivalence test of ADT is proposed through the joint application of normality test and parameter hypothesis tests. In this way, the availability of the ADT data can be distinguished before using them for lifetime prediction of products. In addition, the effects caused by degradation model mis-specification and ADT data misuse are further analyzed from the perspective of relative error. A simulation example and two real-world case studies are used to demonstrate the effectiveness of the proposed methods.","PeriodicalId":49133,"journal":{"name":"Quality Technology and Quantitative Management","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2022-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43806097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The alpha power Weibull transformation distribution applied to describe the behavior of electronic devices under voltage stress profile 用于描述电压应力分布下电子器件行为的α-幂-威布尔变换分布

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-05-17 DOI: 10.1080/16843703.2022.2071526

L. C. Méndez-González, L. A. Rodríguez-Picón, I. J. C. Pérez-Olguín, L. Pérez-Domínguez, David Luviano Cruz

{"title":"The alpha power Weibull transformation distribution applied to describe the behavior of electronic devices under voltage stress profile","authors":"L. C. Méndez-González, L. A. Rodríguez-Picón, I. J. C. Pérez-Olguín, L. Pérez-Domínguez, David Luviano Cruz","doi":"10.1080/16843703.2022.2071526","DOIUrl":"https://doi.org/10.1080/16843703.2022.2071526","url":null,"abstract":"ABSTRACT This paper presents a life-stress methodology that models the failure rate in the form of a bathtub curve. The model consists of the Alpha Power Transformation (APT), which adds an extra parameter to the probability distributions to achieve better flexibility in the representation in the data analysis. To build the life–stress relationship, the APT is combined with the Weibull Distribution (WD) and the Inverse Power Law (IPL) as a stress model to relate the data from the accelerated life tests (ALT), thus presenting the APTW-IPL. Statistical properties of the APTW-IPL are analyzed and discussed. For the parameter estimation of APTW-IPL, the Maximum Likelihood Estimator was used. On the other hand, to test the efficacy of the APTW-IPL, the model is compared with other methodologies that describe the behavior of the bathtub curve in two case studies related to determining the behavior of electronic devices that were subjected to ALT. The results show that the APTW-IPL can be a good option for reliability analysis in electronic devices. It represents the failure times in the form of a bathtub curve, the value of MTTF, and fitting the distribution to the case study data.","PeriodicalId":49133,"journal":{"name":"Quality Technology and Quantitative Management","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2022-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49431952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Estimation of P(Y 对数正态分布中P（Y<X）的估计

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-05-04 DOI: 10.1080/16843703.2022.2052585

Y. Tripathi, C. Petropoulos, M. Jha

引用次数: 2

An M/G/1 queueing model with k sequential heterogeneous service steps and vacations in the transient state 具有k个连续异构服务步骤和暂态休假的M/G/1队列模型

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-04-26 DOI: 10.1080/16843703.2021.1981529

Ali Mohammadi, M. R. Salehi Rad

引用次数: 4

Optimal replacement policies for systems under sporadic shocks and healing impetus 偶发性冲击和愈合动力下系统的最优替代政策

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-04-25 DOI: 10.1080/16843703.2022.2051846

Debolina Chatterjee, J. Sarkar

{"title":"Optimal replacement policies for systems under sporadic shocks and healing impetus","authors":"Debolina Chatterjee, J. Sarkar","doi":"10.1080/16843703.2022.2051846","DOIUrl":"https://doi.org/10.1080/16843703.2022.2051846","url":null,"abstract":"ABSTRACT A system is experiencing two kinds of sporadic impacts: valid shocks that cause damage instantaneously, and positive interventions that induce partial healing. Whereas each shock inflicts a fixed magnitude of damage, the accumulated effect of positive interventions nullify the damaging effect of one shock. The system is said to be in stage 1, when it can possibly heal, until the net count of impacts (valid shocks registered minus valid shocks nullified) reaches a threshold . Thereafter, the system enters stage 2, when no more healing is possible. The system fails when the net count of valid shocks reaches another threshold . The inter-arrival times between successive valid shocks and those between successive positive interventions are independent and follow arbitrary distributions; thereby we remove the restrictive assumption of exponential distributions often found in the literature. We find the distributions of the sojourn time in stage 1 and the failure time of the system. Finally, we find the optimal values of choice variables that minimize the expected maintenance cost per unit time for three different maintenance policies.","PeriodicalId":49133,"journal":{"name":"Quality Technology and Quantitative Management","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2022-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45594892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A multi-station unreliable machine model with working vacation policy and customers’ impatience 考虑休假政策和客户不耐烦的多站不可靠机器模型

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-04-24 DOI: 10.1080/16843703.2022.2054088

A. Bouchentouf, Mohamed Boualem, Lahcene Yahiaoui, Hijaz Ahmad

{"title":"A multi-station unreliable machine model with working vacation policy and customers’ impatience","authors":"A. Bouchentouf, Mohamed Boualem, Lahcene Yahiaoui, Hijaz Ahmad","doi":"10.1080/16843703.2022.2054088","DOIUrl":"https://doi.org/10.1080/16843703.2022.2054088","url":null,"abstract":"ABSTRACT Working vacation queues with breakdowns and customers impatience have many applications in different real-life situations. The development of these models to determine their performance is extremely important. In this paper, we deal with a finite population Markovian multi-server machine system with breakdowns, repairs, Bernoulli feedback, balking, reneging, and retention of reneged customers, under multiple synchronous working vacations. The investigated model has a potential application in the real-world machine systems, such as the automated manufacturing systems with limited space. For the analysis purpose, we employ Q-matrix method in order to obtain the steady-state probabilities as well as closed-form expressions for several system characteristics. Particular cases of the current study are presented. We construct the expected cost function and develop an optimization problem to determine the optimum cost. The direct search method and the Quasi–Newton method are applied to find the optimum system capacity, the minimum number of servers, and the optimum service rates during both working vacation and regular busy periods at minimum cost. Lastly, a sensitivity analysis for the numerical simulation is carried out.","PeriodicalId":49133,"journal":{"name":"Quality Technology and Quantitative Management","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2022-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43364709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Desensitized control charts with operational importance for autocorrelated processes 对自相关过程具有操作重要性的脱敏控制图

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-04-18 DOI: 10.1080/16843703.2022.2058720

samrad Jafarian-Namin, M. Fallahnezhad, R. Tavakkoli-Moghaddam, A. Salmasnia

{"title":"Desensitized control charts with operational importance for autocorrelated processes","authors":"samrad Jafarian-Namin, M. Fallahnezhad, R. Tavakkoli-Moghaddam, A. Salmasnia","doi":"10.1080/16843703.2022.2058720","DOIUrl":"https://doi.org/10.1080/16843703.2022.2058720","url":null,"abstract":"ABSTRACT Organizations that achieved higher capabilities to meet expectations by successfully implementing quality improvement plans can make adjustments to process monitoring without any losses for customers. This approach may reduce costs due to desensitization in monitoring. In this regard, the acceptance control chart (ACC) under the assumptions of independence and normality has already been introduced. However, in practice, particular correlation patterns can be extracted among samples that violate the assumption of independence. Autocorrelation reduces the performance of traditional control charts. In the present study, three types of ACC are extended for monitoring the mean of the most widely used autocorrelated processes. The performance of the proposed charts is evaluated using statistical measures. It is found that the residual-based exponentially weighted moving average ACC (R-EWMA-ACC) has the best performance. Also, two numerical examples illustrate its application. Moreover, optimizing the economic-statistical model indicates that the R-EWMA-ACC spends less than the ARMA control chart.","PeriodicalId":49133,"journal":{"name":"Quality Technology and Quantitative Management","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2022-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43205090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

One-sided Adaptive Truncated Exponentially Weighted Moving Average X¯ Schemes for Detecting Process Mean Shifts 检测过程均值移位的单侧自适应截断指数加权移动平均X¯方案

IF 2.8 2区工程技术

Quality Technology and Quantitative Management Pub Date : 2022-04-11 DOI: 10.1080/16843703.2022.2033404

Fupeng Xie, P. Castagliola, Zhonghua Li, Jinsheng Sun, Xuelong Hu

{"title":"One-sided Adaptive Truncated Exponentially Weighted Moving Average X¯ Schemes for Detecting Process Mean Shifts","authors":"Fupeng Xie, P. Castagliola, Zhonghua Li, Jinsheng Sun, Xuelong Hu","doi":"10.1080/16843703.2022.2033404","DOIUrl":"https://doi.org/10.1080/16843703.2022.2033404","url":null,"abstract":"ABSTRACT One-sided type schemes are known to be more appropriate for monitoring a process when the direction of a potential mean shift can be anticipated. The one-sided adaptive truncated exponentially weighted moving average (ATEWMA) scheme recommended in this paper is a control chart that combines a Shewhart scheme and a new one-sided EWMA scheme together in a smooth way for rapidly detecting the upward (or downward) mean shifts. The truncation method used in this paper helps to improve the sensitivity of the recommended scheme for detecting both small and large mean shifts simultaneously. To further improve the detection efficiency of the recommended scheme, we also suggest integrating a variable sampling interval (VSI) feature into the recommended scheme. Markov chain models are established to analyze the run length (RL) properties of the recommended scheme in both the zero-state and the steady-state cases. Comparison results show that the recommended one-sided ATEWMA scheme works better than the conventional adaptive EWMA (AEWMA) chart and the improved one-sided EWMA chart in detecting a wide range of mean shifts. Finally, a numerical example is presented to illustrate the usage of the proposed one-sided ATEWMA scheme for detecting process mean shifts.","PeriodicalId":49133,"journal":{"name":"Quality Technology and Quantitative Management","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45776469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2