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  • 1
    Electronic Resource
    Electronic Resource
    A general formulation for mean-value analysis in product-form batch-movement queueing networks (1994)
    Springer
    Queueing systems 16 (1994), S. 363-372 
    Details
    ISSN: 1572-9443
    Keywords: Mean-value analysis ; product form ; batch movement ; queueing networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01158962
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Geometric equilibrium distributions for queues with interactive batch departures (1994)
    Springer
    Annals of operations research 48 (1994), S. 493-511 
    Details
    ISSN: 1572-9338
    Keywords: Product form ; geometric distribution ; batch departures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033316
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Closed queueing networks with batch services (1990)
    Springer
    Queueing systems 6 (1990), S. 59-70 
    Details
    ISSN: 1572-9443
    Keywords: Batch services ; discrete-time queues ; queueing networks ; product form
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411465
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  • 4
    Electronic Resource
    Electronic Resource
    Product form in networks of queues with batch arrivals and batch services (1990)
    Springer
    Queueing systems 6 (1990), S. 71-87 
    Details
    ISSN: 1572-9443
    Keywords: Batch services ; batch arrivals ; queueing networks ; correlated routing ; product form
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411466
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Insensitivity in discrete time queues with a moving server (1992)
    Springer
    Queueing systems 11 (1992), S. 273-297 
    Details
    ISSN: 1572-9443
    Keywords: Product form ; insensitivity ; round robin queues ; symmetric queues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01164006
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  • 6
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    Unknown
    Pindar Fr. 140 b SNELL-MAEHLER: The Chariot and the Dolphin (1992)
    Wiesbaden, etc. : Periodicals Archive Online (PAO)
    Hermes. 120 (1992) 148 
    Details
    ISSN: 0018-0777
    Topics: Classical Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5443-1992-120-00-000015
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A Magnetic Resonance Accelerator for Electrons (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 699-700 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN his paper, “A New Method of Acceleration of Relativistic Particles”, Veksler1 proposed two methods of overcoming the limitation of the cyclotron due to the relativistic increase of the mass of the particle. One of these is the synchrotron, now well known; and the other, which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162699a0
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    LR White embedding allows a multi-method approach to the analysis of brain tissue from patients with Alzheimer's disease (1990)
    Springer
    Journal of molecular histology 22 (1990), S. 257-268 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01387181
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    Paper (German National Licenses)
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