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  • Discrete-time queues  (1)
  • Imbedded Markov chain  (1)
  • Pisum sativum  (1)
  • Subscriber Line Modules  (1)
  • batch sizes  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Some analytical results for congestion in subscriber line modules (1992)
    Springer
    Queueing systems 10 (1992), S. 381-402 
    Details
    ISSN: 1572-9443
    Schlagwort(e): Asymptotic behaviours ; diffusion approximations ; iterative algorithms ; retrial queues ; Subscriber Line Modules
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract In modern telephone exchanges, subscriber lines are usually connected to the so-called subscriber line modules. These modules serve both incoming and outgoing traffic. An important difference between these two types of calls lies in the fact that in the case of blocking due to all channels busy in the module, outgoing calls can be queued whereas incoming calls get busy signal and must be re-initiated in order to establish the required connection. The corresponding queueing model was discussed recently by Lederman, but only the model with losses has been studied analytically. In the present contribution, we study the model which takes into account subscriber retrials and investigate some of its properties such as existence of stationary regime, derive explicit formulas for the system characteristics, limit theorems for systems under high repetition intensity of blocked calls and limit theorems for systems under heavy traffic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01193327
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A survey on retrial queues (1987)
    Springer
    Queueing systems 2 (1987), S. 201-233 
    Details
    ISSN: 1572-9443
    Schlagwort(e): Imbedded Markov chain ; retrial queues ; stochastic decomposition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract Queueing systems in which arriving customers who find all servers and waiting positions (if any) occupied may retry for service after a period of time are called retrial queues or queues with repeated orders. Retrial queues have been widely used to model many problems in telephone switching systems, telecommunication networks, computer networks and computer systems. In this paper, we discuss some important retrial queueing models and present their major analytic results and the techniques used. Our concentration is mainly on single-server queueing models. Multi-server queueing models are briefly discussed, and interested readers are referred to the original papers for details. We also discuss the stochastic decomposition property which commonly holds in retrial queues and the relationship between the retrial queue and the queue with server vacations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01158899
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    On the steady-state queue size distribution of the discrete-timeGeo/G/1 queue with repeated customers (1995)
    Springer
    Queueing systems 21 (1995), S. 199-215 
    Details
    ISSN: 1572-9443
    Schlagwort(e): Discrete-time queues ; generating functions ; recursive computation ; retrial queues ; stochastic decomposition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract In this paper, we study the steady-state queue size distribution of the discrete-timeGeo/G/1 retrial queue. We derive analytic formulas for the probability generating function of the number of customers in the system in steady-state. It is shown that the stochastic decomposition law holds for theGeo/G/1 retrial queue. Recursive formulas for the steady-state probabilities are developed. Computations based on these recursive formulas are numerically stable because the recursions involve only nonnegative terms. Since the regularGeo/G/1 queue is a special case of theGeo/G/1 retrial queue, the recursive formulas can also be used to compute the steady-state queue size distribution of the regularGeo/G/1 queue. Furthermore, it is shown that a continuous-timeM/G/1 retrial queue can be approximated by a discrete-timeGeo/G/1 retrial queue by dividing the time into small intervals of equal length and the approximation approaches the exact when the length of the interval tends to zero. This relationship allows us to apply the recursive formulas derived in this paper to compute the approximate steady-state queue size distribution of the continuous-timeM/G/1 retrial queue and the regularM/G/1 queue.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01158581
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Batch sizes and lead-time performance in flexible manufacturing systems (1996)
    Springer
    International journal of flexible manufacturing systems 8 (1996), S. 5-21 
    Details
    ISSN: 1572-9370
    Schlagwort(e): flexible manufacturing systems ; batch sizes ; lead-times
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Production lead-time performance in flexible manufacturing systems is influenced by several factors which include: machine groupings, demand rates, machine processing rates, product batching, material handling system capacity, and so on. Hence, control of lead-time performance can be affected through the manipulation of one or more of these variables. In this article, we investigate the potential of batch sizing as a control variable for lead-time performance through the use of a queueing network model. We establish a functional relationship between the two variables, and incorporate the relationship in an optimization model to determine the optimal batch size(s) which minimizes the sum of annual work-in-process inventory and final inventory costs. The nonlinear batch sizing problem which results is solved by discrete optimization via marginal analysis. Results show that batch sizing can be a cheap and effective variable for controlling flexible manufacturing system throughput.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00167798
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Promotion of stem elongation by indole-3-butyric acid in intact plants of Pisum sativum L. (1999)
    Springer
    Plant growth regulation 27 (1999), S. 157-160 
    Details
    ISSN: 1573-5087
    Schlagwort(e): indole-3-acetic acid ; indole-3-butyric acid ; pea ; Pisum sativum ; stem elongation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract While indole-3-butyric acid (IBA) has been confirmed to be an endogenous form of auxin in peas, and may occur in the shoot tip in a level higher than that of indole-3-acetic acid (IAA), the physiological significance of IBA in plants remains unclear. Recent evidence suggests that endogenous IAA may play an important role in controlling stem elongation in peas. To analyze the potential contribution of IBA to stem growth we determined the effectiveness of exogenous IBA in stimulating stem elongation in intact light-grown pea seedlings. Aqueous IBA, directly applied to the growing internodes via a cotton wick, was found to be nearly as effective as IAA in inducing stem elongation, even though the action of IBA appeared to be slower than that of IAA. Apically applied IBA was able to stimulate elongation of the subtending internodes, indicating that IBA is transported downwards in the stem tissue. The profiles of growth kinetics and distribution suggest that the basipetal transport of IBA in the intact plant stem is slower than that of IAA. Following withdrawal of an application, the residual effect of IBA in growth stimulation was markedly stronger than that of IAA, which may support the notion that IBA conjugates can be a better source of free auxin through hydrolysis than IAA conjugates. It is suggested that IBA may serve as a physiologically active form of auxin in contributing to stem elongation in intact plants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006115414748
    Standort Signatur Erwartet Verfügbarkeit
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