Reliability analysis of computed tomography equipment using the <scp>q‐Weibull</scp> distribution

Litian, Fan; Zhi, Hu; Ling, Qingqing; Li, Hanwei; Qi, Hongliang; Chen, Hongwen

doi:10.1002/eng2.12613

Cited by 5 publications

(3 citation statements)

References 40 publications

(73 reference statements)

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“…However, above the visual analysis of the failure rate function, the shape parameter, β, is decisive in the analysis and enables the identification of failure type. Depending on the value of β, the failure rate, λ, evolves differently and can be associated with one of the phases of the bathtub curve [ 50 ], typical for engineering systems [ 51 ]: If β < 1, the failure rate is decreasing, typical of the “burn-in” period. This kind of failure rate indicates an “early failure” and is typically associated with systems with manufacturing defects; If β = 1, the failure rate is constant, typical of the “useful life” period.…”

Section: Methodsmentioning

confidence: 99%

Section: Tracking Duration Analysismentioning

confidence: 99%

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Novel Microsatellite Tags Hold Promise for Illuminating the Lost Years in Four Sea Turtle Species

Candela,

Wyneken,

Leijen

et al. 2024

Animals

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After hatching, sea turtles leave the nest and disperse into the ocean. Many years later, they return to their natal coastlines. The period between their leaving and their returning to natal areas, known as the “Lost Years”, is poorly understood. Satellite tracking studies aimed at studying the “Lost Years” are challenging due to the small size and prolonged dispersal phases of young individuals. Here, we summarize preliminary findings about the performance of prototype microsatellite tags deployed over a three-year period on 160 neonate to small juvenile sea turtles from four species released in the North Atlantic Ocean. We provide an overview of results analyzing tag performance with metrics to investigate transmission characteristics and causes of tag failure. Our results reveal that, despite certain unfavorable transmission features, overall tag performance was satisfactory. However, most track durations were shorter than those observed on individuals of similar size in other studies and did not allow for detailed analyses of trajectories and turtle behavior. Our study further suggests that tracking durations are correlated with the targeted species, highlighting a lack of robustness against some neritic behaviors. Unprecedented diving data obtained for neonate sea turtles in this study suggest that the vertical behaviors of early juveniles are already too strenuous for these miniaturized tags. Our findings will help to inform the biologging research community, showcasing recent technological advances for the species and life stages within our study.

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Section: Methodsmentioning

confidence: 99%

Section: Tracking Duration Analysismentioning

confidence: 99%

Novel Microsatellite Tags Hold Promise for Illuminating the Lost Years in Four Sea Turtle Species

Candela,

Wyneken,

Leijen

et al. 2024

Animals

View full text Add to dashboard Cite

show abstract

“…Moreover, [6] illustrated the effectiveness of the q-Weibull distribution in analyzing the reliability of computed tomography (CT) equipment failure data. The authors demonstrated that the q-Weibull distribution could effectively describe the entire bathtub curve, which is a graphical representation of the failure rate over time.…”

Section: Introductionmentioning

confidence: 99%

A New Flexible Four Parameter Bathtub Curve Failure Rate Model, and Its Application to Right-Censored Data

et al. 2023

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This article introduces a new flexible four parameter distribution by convolution of the exponential and Weibull distribution using the odd function transformation, which offers greater flexibility in terms of fit, its called the modified exponential-Weibull (MEW). The MEW model is designed to provide a more accurate description of failure time data resulting from a system with one or more failure modes and is characterized by a hazard rate (HR) that takes the shape of a bathtub due to its complexity. The moments properties, quantile function, and residual life are derived and discussed. We discussed the HR function and several distributional properties of the MEW model, and applied maximum likelihood and Bayesian techniques to estimate its unknown parameters. The Hamiltonian Monte Carlo (HMC) algorithm is employed to simulate the posterior distributions and verify the MEW Bayes estimators. We examined the behavior of the MEW model on two data sets with bathtub-shaped HR and compare it with five other popular bathtub-shaped methodologies. The results indicate that the MEW model provided the best description of the two failure time data sets, suggesting that the proposed model could be a viable candidate for solving various real-life problems.INDEX TERMS Bathtub-shape hazard rate, exponential-Weibull model, moments, residual life, Hamiltonian Monte Carlo simulation, time to failure data.

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On the use of a new probabilistic model and machine learning methods with applications to reliability and music engineering

Zhang,

Jia,

Seong

et al. 2024

Alexandria Engineering Journal

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Reliability analysis of computed tomography equipment using the q‐Weibull distribution

Cited by 5 publications

References 40 publications

Novel Microsatellite Tags Hold Promise for Illuminating the Lost Years in Four Sea Turtle Species

Novel Microsatellite Tags Hold Promise for Illuminating the Lost Years in Four Sea Turtle Species

A New Flexible Four Parameter Bathtub Curve Failure Rate Model, and Its Application to Right-Censored Data

On the use of a new probabilistic model and machine learning methods with applications to reliability and music engineering

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