Notker Gerlich

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In a queueing network with overtaking the probabilistic e ects entailed by a customer propagate in such a manner that the sojourn time of the same customer in a node visited later is a ected The main e ect of overtaking is the dependency of node sojourn times on non overtake free paths the sojourn time distribution of a non overtake free path is not simply(More)
Space Division Multiple Access SDMA is a new technology by which the capacity of existing cellular mobile communication systems can economically be increased Based on adaptive array antenna technology the spatial dimension of the existing system is exploited by means of forming independent radio beams in each of the original channels Operating SDMA however(More)
In a queueing network with overtaking, the probabilistic eeects entailed by a customer propagate in such a manner that the sojourn time of the same customer in a node visited later is aaected. The main eeect of overtaking is the dependency of node sojourn times on non-overtake-free paths: the sojourn time distribution of a non-overtake-free path is not(More)
In this paper we investigate the distributions and the long range behavior of cycle times and interdeparture times in two semiconductor manufacturing systems The results were obtained by means of simulation using original work oor level data of semiconduc tor fabrication facilities The ndings presented here show that for those semiconductor facilities the(More)
In semiconductor manufacturing due to rework and re entrant ow overtaking of wafers can occur The e ect of overtaking is that cycle times at successive service centers are not mutually independent As far as the distribution of cycle times is concerned only higher moments are a ected the mean cycle time remaining unchanged by the in uence of overtaking(More)