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  • 1975-1979  (2)
  • 1975  (2)
Material
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  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 14 (1975), S. 79-105 
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es ist bekannt, daß die Anwendung von Methoden der konjugierten Richtungen sowie von geeigneten Modifikationen der Methode der konjugierten Gradienten zur Bestimmung des Minimums einer Funktion vonn Variablen einen-Schritt quadratische Konvergenzgeschwindigkeit ergibt. Eine Menge vonn aufeinanderfolgenden Richtungsvektoren, die von einer dieser Methoden erzeugt worden sind, enthalten Information über die zu minimierende Funktion, die dazu benutzt werden kann, die Konvergenzgeschwindigkeit zu erhöhen durch Ausführung besonderer Iterationsschritte. Unter geeigneten Voraussetzungen ergibt sich für die beschleunigte Methode der konjugierten Gradienten eine (n+1)-Schritt kubische Konvergenzgeschwindigkeit. Die Konvergenzgeschwindigkeit der beschleunigten Methode der konjugierten Richtungen ist in Abhängigkeit von der Häufigkeit der besonderen Iterationsschritte entweder (n+1)-Schritt kubisch oder 2-Schritt superlinear.
    Notes: Abstract Methods of conjugate directions and reset versions of the conjugate gradient method have ann-step quadratic rate of convergence when they are applied to the unconstrained minimization of a function ofn variables. A set ofn consecutive directions of descent generated by one of these methods contains information on the function to be minimized which is used to accelerate the convergence by perorming simple special steps. Under appropriate assumptions the rate of convergence of an accelerated reset version of the conjugate gradient method is (n+1)-step cubic. Depending on the frequency of the special step the rate of convergence of the method of conjugate directions is (n+1)-step cubic or 2-step superlinear.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 210 (1975), S. 266-266 
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Making use of a complicated injection method, whereby the upper enblooded part of the body is irrigated by Berliner Blau or silver nitrate, not only the topographic course but also the angioarchitectural framework of the endothelian and muscular cells of the inner ear vessels of the guinea pig are outlined. Staining with silver reveals a characteristic form of the endothelium cells from the arterial towards the venous end of the terminal vessels of the cochlea. By means of this method on one side a morphologic classification of the vessels on the other side a clear nomenclature are possible.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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