Blar i forfatter Artikler, rapporter og annet (teknologi og sikkerhet) "Zaki, Rezgar"

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    • A mixture frailty model for maintainability analysis of mechanical components: a case study 

      Zaki, Rezgar; Barabadi, Abbas; Garmabaki, Amir Hossein Soleiman; Nuri, Ali (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-07)
      Knowing the maintainability of a component or a system means that repair resource allocations, such as spare part procurement and maintenance training, can be planned and optimized more effectively. Repair data are often collected from multiple and distributed units in different operational conditions, which can introduce heterogeneity into the data. Part of such heterogeneity can be explained and ...

    • Observed and unobserved heterogeneity in failure data analysis 

      Zaki, Rezgar; Barabadi, Abbas; Barabady, Javad; Qarahasanlou, Ali Nouri (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-08)
      In reality, failure data are often collected under diffract operational conditions (covariates), leading to heterogeneity among the data. Heterogeneity can be classified as observed and unobserved heterogeneity. Un-observed heterogeneity is the effect of unknown, unrecorded, or missing covariates. In most reliability studies, the effect of unobserved covariates is neglected. This may lead to inaccurate ...