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- Isa Cakir, Ourania Chryssaphinou, Marianne Månsson
- Combinatorics, Probability & Computing
- 1999

Consider a finite alphabet Ω and strings consisting of elements from Ω. For a given string w, let cor(w) denote the autocorrelation, which can be seen as a measure of the amount of overlap in w. Furthermore, let aw(n) be the number of strings of length n that do not contain w as a substring. Eriksson [4] stated the following conjecture: if cor(w)>cor(wï¿¿),… (More)

- Ourania Chryssaphinou, Nikolaos Limnios, Sonia Malefaki
- IEEE Trans. Reliability
- 2011

We consider repairable reliability systems with m components, the lifetimes and repair times of which are independent. The l-th component can be either in the failure state 0 or in the perfect state d l or in one of the degradation states {1, 2,. .. , d l − 1}. The time of staying in any of these states is a random variable following a discrete distribution… (More)

- A D Barbour, O Chryssaphinou, M Roos, Without Names
- 2010

The compound Poisson "local" formulation of the Stein-Chen method is applied to problems in reliability theory. Bounds for the accuracy of the approximation of the reliability by an appropriate compound Poisson distribution are derived under fairly general conditions, and are applied to consecutive-2 and connected-s systems, and the 2-dimensional… (More)

- Ourania Chryssaphinou
- Discrete Mathematics
- 1985

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