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Ji Hwan Cha

Bio: Ji Hwan Cha is an academic researcher from Ewha Womans University. The author has contributed to research in topics: Population & Preventive maintenance. The author has an hindex of 19, co-authored 154 publications receiving 1403 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors study new classes of extreme shock models and, based on the obtained results and model interpretations, extend these results to several specific combined shock models, and derive the corresponding survival probabilities and discuss some meaningful interpretations and examples.
Abstract: In extreme shock models, only the impact of the current, possibly fatal shock is usually taken into account, whereas in cumulative shock models, the impact of the preceding shocks is accumulated as well. A shock model which combines these two types is called a `combined shock model'. In this paper we study new classes of extreme shock models and, based on the obtained results and model interpretations, we extend these results to several specific combined shock models. For systems subject to nonhomogeneous Poisson processes of shocks, we derive the corresponding survival probabilities and discuss some meaningful interpretations and examples.

122 citations

BookDOI
01 Jan 2013

108 citations

Journal ArticleDOI
TL;DR: In this paper, the authors consider preventive maintenance of items operating in a random environment modeled by a Poisson process of shocks, where an item is replaced either on failure or on the predetermined replacement time, whichever comes first.

75 citations

Journal ArticleDOI
TL;DR: In this article, the authors combine an extreme shock model with a specific cumulative shock model and derive the survival probability and the corresponding failure rate function for a system subject to a specific process of shocks.
Abstract: In extreme shock models, only the impact of the current, possibly fatal shock is usually taken into account, whereas in cumulative shock models, the impact of the preceding shocks is accumulated as well. In this paper we combine an extreme shock model with a specific cumulative shock model. It is shown that the proposed setting can also be interpreted as a generalization of the well-known Brown-Proschan model that describes repair actions for repairable systems. For a system subject to a specific process of shocks, we derive the survival probability and the corresponding failure rate function. Some meaningful interpretations and examples are discussed.

73 citations

Book
16 Apr 2013
TL;DR: In this paper, the basic stochastic models for reliability analysis were used for Environmental Stress Screening, and the basics of Burn-in for repairable systems were discussed, and a theory for Poisson shock models was proposed.
Abstract: 1.Introduction.- 2.Basic Stochastics for Reliability Analysis.- 3.Shocks and Degradation.- 4.Advanced Theory for Poisson Shock Models.- 5.Heterogeneous Populations.- 6.The basics of Burn-in.- 7.Burn-in for Repairable Systems.- 8.Burn-in for Heterogeneous Populations.- 9.Shocks as Burn-in.- 10.Stochastic Models for Environmental Stress Screening.

71 citations


Cited by
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Book
01 Jan 2013
TL;DR: In this paper, the authors consider the distributional properties of Levy processes and propose a potential theory for Levy processes, which is based on the Wiener-Hopf factorization.
Abstract: Preface to the revised edition Remarks on notation 1. Basic examples 2. Characterization and existence 3. Stable processes and their extensions 4. The Levy-Ito decomposition of sample functions 5. Distributional properties of Levy processes 6. Subordination and density transformation 7. Recurrence and transience 8. Potential theory for Levy processes 9. Wiener-Hopf factorizations 10. More distributional properties Supplement Solutions to exercises References and author index Subject index.

1,957 citations

01 Jan 2016
TL;DR: An introduction to the theory of point processes is universally compatible with any devices to read and will help you get the most less latency time to download any of the authors' books like this one.
Abstract: Thank you for downloading an introduction to the theory of point processes. As you may know, people have search hundreds times for their chosen novels like this an introduction to the theory of point processes, but end up in infectious downloads. Rather than enjoying a good book with a cup of coffee in the afternoon, instead they juggled with some harmful virus inside their computer. an introduction to the theory of point processes is available in our digital library an online access to it is set as public so you can download it instantly. Our book servers hosts in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Merely said, the an introduction to the theory of point processes is universally compatible with any devices to read.

903 citations

Journal ArticleDOI
TL;DR: The author does an admirable job of explaining the differences between Bayesian probability and the frequentist notion of probability, showing that, philosophically, only the Bayesian makes sense.
Abstract: (2003). Comparison Methods for Stochastic Models and Risks. Technometrics: Vol. 45, No. 4, pp. 370-371.

611 citations

Journal ArticleDOI
TL;DR: This paper reviews recent modeling developments of the Wiener-process-based methods for degradation data analysis and RUL estimation, as well as their applications in the field of prognostics and health management (PHM).

367 citations