Szukana fraza: [Abstract = "The server is switched off \(is in sleep mode\) for some time. This time finishes \(the server wakes up\) if both the number of customers in the buffer and the number of energy units reach some fixed threshold values or when the number of energy units reaches some threshold value and there are customers in the buffer. Arrival flows of customers and energy units are assumed to be described by an independent Markovian arrival process. The service time has a phase\-type distribution. The system behavior is described by a multi\-dimensional Markov chain."]

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