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  • Articles  (2)
  • Schlüsselwörter: Lagerhaltung – Mehrstufig – Divergierend – Allokation – Unsichere Wiederbeschaffungszeiten  (1)
  • chromosome  (1)
  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 21 (1999), S. 331-359 
    ISSN: 1436-6304
    Keywords: Key words: Inventory – Multi-echelon – Divergent – Allocation – Random lead times ; Schlüsselwörter: Lagerhaltung – Mehrstufig – Divergierend – Allokation – Unsichere Wiederbeschaffungszeiten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung. Die Arbeit behandelt das Problem des Bestandsmanagements in mehrstufigen, divergierenden Lagerhaltungssystemen mit stochastischen Wiederbeschaffungszeiten. Die Steuerung erfolgt mittels einer systemweiten Bestellgrenzenregel bei periodischer Kontrolle. Es wird ein Verfahren zur Bestimmung von Bestellgrenzen und Allokationsparametern zur Einhaltung vorgegebener ( $\beta$ -) Servicegrade konstruiert. Ausführliche numerische Untersuchungen zeigen die zufriedenstellende Genauigkeit der heuristischen Vorgehensweise. Weiterhin wird gezeigt, daß die Variabilität der Wiederbeschaffungszeiten einen erheblichen Einfluß auf die erforderlichen Bestände haben kann und nicht vernachlässigt werden darf. Außerdem zeigt sich, daß die Korrelationsstruktur in den Wiederbeschaffungszeiten ebenfalls von erheblicher Bedeutung sein kann.
    Notes: Abstract. This paper deals with integral inventory control in multi-echelon divergent systems with stochastic lead times. The policy considered is an echelon stock, periodic review, order-up-to (R, S) policy. A computational method is derived to obtain the order-up-to level and the allocation fractions required to achieve given target fill rates. Extensive numerical experimentation shows that the accuracy of our approximate method is satisfactory. Further we show that variation in the lead times may have a significant effect on the stock levels required to achieve given target fill rates, hence this variation may not be ignored. Also, it appears that the correlation structure in the lead times may have a significant impact as well.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-2932
    Keywords: sulfur ; redox status ; thiol ; chromosome ; glutathione ; Picea omorika
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Three year old spruce trees (Picea omorika) were exposed to 100 and 225 nl l-1 SO2 and H2S for three weeks. The number of chromosomal aberrations and the mitotic index in the root tip meristems, and glutathione and cysteine contents in fine roots were determined twice weekly. An increase in glutathione content in fine roots of H2S exposed plants was only detectable after 13 days of fumigation. The number of chromosomal aberrations increased significantly after 9 days of exposure to 225 nl l-1 H2S and after 13 days of exposure to 225 nl l-1 SO2 or 100 nl l-1 H2S. This increase in chromosomal damage persisted up to the end of the 3 week treatment. Neither SO2 nor H2S exposure affected the cysteine content or the redox state of glutathione in fine roots. These results suggest that the development of chromosomal aberrations during SO2 and H2S exposures does not directly reflect changes in thiol/glutathione content or redox state in the fine roots.
    Type of Medium: Electronic Resource
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