Browsing Mathematics, Statistics & Physics by Author "Abbasi, Saddam Akber"
Now showing items 21-40 of 47
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Employing machine learning techniques in monitoring autocorrelated profiles
Yeganeh, Ali; Johannssen, Arne; Chukhrova, Nataliya; Abbasi, Saddam Akber; Pourpanah, Farhad ( Springer Science and Business Media Deutschland GmbH , 2023 , Article)In profile monitoring, it is usually assumed that the observations between or within each profile are independent of each other. However, this assumption is often violated in manufacturing practice, and it is of utmost ... -
Enhanced adaptive multivariate EWMA and CUSUM charts for process mean
Haq, Abdul; Khoo, Michael B.C.; Ha Lee, Ming; Abbasi, Saddam Akber ( Taylor and Francis Ltd. , 2021 , Article)The multivariate charts are mostly used to simultaneously monitor several quality characteristics in manufacturing processes. In this study, we enhance the sensitivities of the recently proposed adaptive multivariate EWMA ... -
Enhanced remediation of Cr6+ in bacterial-assisted floating wetlands
Akram, Aysha; Tara, Nain; Khan, Muhammad Asaf; Abbasi, Saddam Akber; Irfan, Muhammad; Arslan, Muhammad; Afzal, Muhammad... more authors ... less authors ( Blackwell Publishing Ltd , 2020 , Article)Hexavalent chromium (Cr6+) is reported to have negative effects on fauna and flora. The present study establishes plant-bacterial synergism in floating wetlands (FWs) for the maximum removal of Cr6+ from the contaminated ... -
Enhancing the detection ability of control charts in profile monitoring by adding RBF ensemble model
Yeganeh, Ali; Shadman, Alireza; Abbasi, Saddam Akber ( Springer , 2022 , Article)While numerous contributions and applications have been extended in profile monitoring, little attention has been paid to employing machine learning techniques in development of control charts. In this paper, a novel control ... -
Enhancing the detection ability of control charts in profile monitoring by adding RBF ensemble model
Yeganeh, Ali; Shadman, Alireza; Abbasi, Saddam Akber ( Springer Science and Business Media Deutschland GmbH , 2022 , Article)While numerous contributions and applications have been extended in profile monitoring, little attention has been paid to employing machine learning techniques in development of control charts. In this paper, a novel control ... -
Exponentially weighted moving average control charts for monitoring coefficient of variation under ranked set-sampling schemes
Alabi, Oluwapelumi; Adegoke, Nurudeen A.; Adebola, Femi Barnabas; Oseni, Bamidele Mustapha; Abbasi, Saddam Akber ( Taylor and Francis , 2021 , Article)Several coefficients of variation (CV) control charts under simple random schemes (SRS) have been proposed to monitor process relative variability. However, little attention has been given to investigating the performance ... -
Improved Nonparametric Control Chart Based on Ranked Set Sampling with Application of Chemical Data Modelling
Rasheed, Zahid; Khan, Majid; Abiodun, Nafiu Lukman; Anwar, Syed Masroor; Khalaf, G.; Abbasi, Saddam Akber... more authors ... less authors ( Hindawi Limited , 2022 , Article)e statistical performance of parametric control charts is questionable when the underlying process does not follow any speci ed probability distribution. Nonparametric control charts are the best substitute for this ... -
Linear profile monitoring using EWMA structure under ranked set schemes
Riaz, Muhammad; Mahmood, Tahir; Abbasi, Saddam Akber; Abbas, Nasir; Ahmad, Shabbir ( Springer London , 2017 , Article)In many manufacturing processes, study variable is not the only quality characteristic, but there may exist some explanatory variable(s) that are associated with the study variable. This association may be linear or nonlinear ... -
Mixed EWMA-CUSUM and mixed CUSUM-EWMA modified control charts for monitoring first order autoregressive processes
Osei-Aning, Richard; Abbasi, Saddam Akber; Riaz, Muhammad ( Taylor and Francis Ltd. , 2017 , Article)In practice most processes are known to produce autocorrelated observations. Autocorrelation degrades the performance of control charts by producing frequent false alarms when the process is stable or makes the charts ... -
Monitoring multivariate coefficient of variation for high-dimensional processes
Adegoke, Nurudeen A.; Dawod, Abdaljbbar; Adeoti, Olatunde Adebayo; Sanusi, Ridwan A.; Abbasi, Saddam Akber ( John Wiley and Sons Ltd , 2022 , Article)Multivariate coefficient of variation (MCV) charts are effective tools for monitoring process relative variability. They are developed on the assumption that the process subgroup size available for monitoring the MCV ... -
Monitoring non-parametric profiles using adaptive EWMA control chart
Abbasi, Saddam Akber; Yeganeh, Ali; Shongwe, Sandile C. ( Nature Research , 2022 , Article)To monitor the quality of a process in statistical process control (SPC), considering a functional relationship between a dependent variable and one or more independent variables (which is denoted as profile monitoring) ... -
Multivariate control charts for monitoring process mean vector of individual observations under regularized covariance estimation
Omolofe, Olusola T.; Adegoke, Nurudeen A.; Adeoti, Olatunde A.; Fasoranbaku, Olusoga A.; Abbasi, Saddam Akber (2021 , Article)Multivariate control charts are generally used in industries for monitoring and diagnosing processes characterized by several process variables. The applications of charts assume that the in-control process parameters are ... -
Multivariate Mixed EWMA-CUSUM Control Chart for Monitoring the Process Variance-Covariance Matrix
Muhammad; Ajadi, Jimoh Olawale; Mahmood, Tahir; Abbasi, Saddam Akber ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)The dispersion control charts monitor the variability of a process that may increase or decrease. An increase in dispersion parameter implies deterioration in the process for an assignable cause, while a decrease in ... -
New efficient exponentially weighted moving average variability charts based on auxiliary information
Abbasi, Saddam Akber; Riaz, Muhammad; Ahmad, Shabbir; Sanusi, Ridwan A.; Abid, Muhammad ( John Wiley and Sons Ltd , 2020 , Article)Control chart is a well-known tool for monitoring the performance of an ongoing process. The variability of a process is an important parameter that may deteriorate the process performance if it is not taken care on time. ... -
Nonparametric multivariate covariance chart for monitoring individual observations
Adegoke, Nurudeen A.; Ajadi, Jimoh Olawale; Mukherjee, Amitava; Abbasi, Saddam Akber ( Elsevier , 2022 , Article)Parametric and nonparametric multivariate control charts that are proven very useful in monitoring the covariance matrix of multivariate normally or “nearly” normally distributed continuous datasets have been proposed in ... -
On designing a sequential based EWMA structure for efficient process monitoring
Abbasi, Saddam Akber; Khaliq, Qurat Ul Ain; Omar, M. Hafidz; Riaz, Muhammad ( Taylor and Francis Ltd. , 2020 , Article)Control chart is a popular technique that is widely used in statistical process control to identify any possible deviations from a stable state of a process. Shewhart charts are famous for identifying larger shifts, while ... -
On designing an assorted control charting approach to monitor process dispersion: an application to hard-bake process
Abbas, Nasir; Saeed, Usman; Riaz, Muhammad; Abbasi, Saddam Akber ( Taylor and Francis Ltd. , 2020 , Article)The monitoring of process variability is an important feature to get optimal output from a process. Control charts are vital tools used for efficient process monitoring. The commonly used types of charts include Shewhart, ... -
On designing efficient memory-type charts using multiple auxiliary-information
Abbas, Zameer; Nazir, Hafiz Zafar; Abbasi, Saddam Akber; Riaz, Muhammad; Xiang, Dongdong ( Taylor and Francis Ltd. , 2023 , Article)This article intends to investigate new progressive mean (MEP) charts using a single auxiliary characteristic (AMEP) and two auxiliary characteristics (TAMEP) to trace small shifts in the process mean effectively. The ... -
On Model Selection for Autocorrelated Processes in Statistical Process Control
Dawod, Abdaljbbar B. A.; Riaz, Muhammad; Abbasi, Saddam Akber ( John Wiley and Sons Ltd , 2017 , Article)Using traditional control charts to monitor autocorrelated processes is not beneficial, because it will lead us to misleading detections in the processes. One of the methods used to deal with the control charts for ... -
On Phase-I monitoring of process location parameter with auxiliary information-based median control charts
Hussain, Shahid; Mei, Sun; Riaz, Muhammad; Abbasi, Saddam Akber ( MDPI AG , 2020 , Article)A control chart is often used to monitor the industrial or services processes to improve the quality of the products. Mostly, the monitoring of location parameters, both in Phase I and Phase II, is done using a mean control ...