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  • 1
    facet.materialart.
    Unbekannt
    Wiesbaden, etc. : Periodicals Archive Online (PAO)
    Hermes. 120 (1992) 148 
    ISSN: 0018-0777
    Thema: Klassische Philologie, Byzantinistik, Mittellateinische und Neugriechische Philologie, Neulatein
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1572-9443
    Schlagwort(e): Mean-value analysis ; product form ; batch movement ; queueing networks
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract A number of recent papers have shown that many classes of queueing networks with batches of customers served and routed through the network have equilibrium distributions which factorise into product forms over the nodes of the network. In this paper we demonstrate how such networks are amenable to a mean-value analysis which generalises that used for single-movement networks. Since product-form stochastic Petri nets (SPNs) can be viewed as batch-movement queueing networks, our algorithm is also applicable to their analysis.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Queueing systems 6 (1990), S. 59-70 
    ISSN: 1572-9443
    Schlagwort(e): Batch services ; discrete-time queues ; queueing networks ; product form
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract In this paper we study queueing networks which allow multiple changes at a given time. The model has a natural application to discrete-time queueing networks but describes also queueing networks in continuous time. It is shown that product-form results which are known to hold when there are single changes at a given instant remain valid when multiple changes are allowed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Annals of operations research 48 (1994), S. 493-511 
    ISSN: 1572-9338
    Schlagwort(e): Product form ; geometric distribution ; batch departures
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Wirtschaftswissenschaften
    Notizen: Abstract Gelenbe et al. [1, 2] consider single server Jackson networks of queues which contain both positive and negative customers. A negative customer arriving to a nonempty queue causes the number of customers in that queue to decrease by one, and has no effect on an empty queue, whereas a positive customer arriving at a queue will always increase the queue length by one. Gelenbe et al. show that a geometric product form equilibrium distribution prevails for this network. Applications for these types of networks can be found in systems incorporating resource allocations and in the modelling of decision making algorithms, neural networks and communications protocols. In this paper we extend the results of [1, 2] by allowing customer arrivals to the network, or the transfer between queues of a single positive customer in the network to trigger the creation of a batch of negative customers at the destination queue. This causes the length of the queue to decrease by the size of the created batch or the size of the queue, whichever is the smallest. The probability of creating a batch of negative customers of a particular size due to the transfer of a positive customer can depend on both the source and destination queue. We give a criterion for the validity of a geometric product form equilibrium distribution for these extended networks. When such a distribution holds it satisfies partial balance equations which are enforced by the boundaries of the state space. Furthermore it will be shown that these partial balance equations relate to traffic equations for the throughputs of the individual queues.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Queueing systems 11 (1992), S. 273-297 
    ISSN: 1572-9443
    Schlagwort(e): Product form ; insensitivity ; round robin queues ; symmetric queues
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract Queues in which customers request service consisting of an integral number of segments and in which the server moves from service station to service station are of considerable interest to practitioners working on digital communications networks. In this paper, we present “insensitivity” theorems and thereby equilibrium distributions for two discrete time queueing models in which the server may change from one customer to another after completion of each segment of service. In the first model, exactly one segment of service is provided at each time point whether or not an arrival occurs, while in the second model, at most one arrival or service occurs at each time point. In each model, customers of typet request a service time which consists ofl segments in succession with probabilityb t(l). Examples are given which illustrate the application of the theorems to round robin queues, to queues with a persistent server, and to queues in which server transition probabilities do not depend on the server's previous position. In addition, for models in which the probability that the server moves from one position to another depends only on the distance between the positions, an amalgamation procedure is proposed which gives an insensitive model on a coarse state space even though a queue may not be insensitive on the original state space. A model of Daduna and Schassberger is discussed in this context.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Queueing systems 6 (1990), S. 71-87 
    ISSN: 1572-9443
    Schlagwort(e): Batch services ; batch arrivals ; queueing networks ; correlated routing ; product form
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract A product form equilibrium distribution is derived for a class of queueing networks in either discrete or continuous time, in which multiple customers arrive simultaneously and batches of customers complete service simultaneously.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    ISSN: 1573-6865
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Light (LM) and electron (EM) microscope comparisons of the cytochemistry and immunocytochemistry of neuritic plaques and neurofibrillary tangles, the main histopathological changes in the brains of Alzheimer's disease sufferers, have been almost impossible because of the disparity between the two technologies. By embedding unosmicated brain tissue in the acrylic resin LR White, direct comparisons can be made between techniques applied at the LM level with those at the EM level. After partial dehydration in 70% ethanol, the tissue is embedded by rapid infiltration and polymerization at 0°C, which has been shown to maximally preserve tissue immunoreactivity. Semithin sections are then receptive to routine LM stains, silver stains e.g. Gomori's methenamine silver, and immunocytochemistry with immunoperoxidase or immunocolloidal gold. Serial thin from the use of a mouse monoclonal antibody against β-amyloid and a rabbit polyclonal antibody against ubiquitin are presented. LR White resin includes no elements other than carbon, oxygen and nitrogen, of which it is composed, so that sections of it are valuable for sensitive X-ray energy dispersive microanalysis.
    Materialart: Digitale Medien
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