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- 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 dl or in one of the degradation states {1, 2, . . . , dl − 1}. The time of staying in any of these states is a random variable following a discrete distribution… (More)

- 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(w�),… (More)

- Ourania Chryssaphinou
- Discrete Mathematics
- 1985

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