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  • NP-Vollständigkeit  (1)
  • cigarette smoking  (1)
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 37 (1989), S. 517-520 
    ISSN: 1432-1041
    Keywords: nicotine ; epinephrine ; cigarette smoking ; total forearm blood flow ; muscle blood flow ; plethysmography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In 9 healthy subjects the effect of smoking one cigarette (nicotine content 0.9 mg) on blood pressure, heart rate and total and muscle blood flow in the forearm was measured. Blood flow was measured by a new noninvasive plethysmographic method that simultaneously gives quantitative data about total and muscle blood flow. Smoking the cigarette did not significantly affect blood pressure or heart rate. Total blood flow in the forearm did not change but the flow to the muscle was increased and resistance in this vascular bed was decreased. The pattern of haemodynamic changes in the forearm indicates that epinephrine may be the mediator of the circulatory effects of nicotine.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 32 (1988), S. 213-230 
    ISSN: 1432-5217
    Keywords: linear arrangement ; dynamic programming ; NP-completeness ; Linear Arrangement ; dynamische Programmierung ; NP-Vollständigkeit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Wir analysieren die Komplexität von eingeschränkten Linear Arrangement Problemen, bei denen nur solche Permutationen der Knoten erlaubt sind, die durch die Ordnung eines die Knoten des Graphen strukturierenden, binären Baumes — des sogenannten P-tress — entstehen. Derartige Versionen von Linear Arrangement Problemen tauchen an mehreren Stellen in heutigen Schaltkreis Layout Systemen auf. Der P-tree resultiert dabei aus einem rekursiven Zerteiluungsprozeß des Graphen. Wir zeigen, daß das MINCUT LINEAR ARRANGEMENT und das OPTIMAL LINEAR ARRANGEMENT Problem in polynomieller Zeit lösbar sind, wenn der P-tree balanciert ist. Alle anderen betrachteten Versionen von Linear Arrangement Problemen sind NP-vollständig.
    Notes: Abstract We analyze the complexity of the restrictions of linear arrangement problems that are obtained if the legal permutations of the nodes are restricted to those that can be obtained by orderings of a binary tree structuring the nodes of the graph, the so-called p-tree. These versions of the linear arrangement problems occur in several places in current circuit layout systems. There the p-tree is the result of a recursive partitioning process of the graph. We show that the MINCUT LINEAR ARRANGEMENT problem and the OPTIMAL LINEAR ARRANGEMENT problem can be solved in polynomial time, if the p-tree is balanced. All other versions of the linear arrangement problems we analyzed are NP-complete.
    Type of Medium: Electronic Resource
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