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  • 2000-2004  (1)
  • 1985-1989  (3)
  • 1940-1944  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 36 (1986), S. 301-311 
    ISSN: 1436-5057
    Keywords: 90C08 ; Assignment problem ; algorithms ; computational results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir beschreiben eine neue Implementierung der kürzesten-erweiternden-Wege-Methode zur Lösung dünner Zuordnungsprobleme und berichten über numerische Untersuchungen, die die Effizienz dieser Implementierung dokumentieren.
    Notes: Abstract We describe a new implementation of the shortest augmenting path approach for solving sparse assignment problems and report computational experience documenting its efficiency.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computing 36 (1986), S. 263-270 
    ISSN: 1436-5057
    Keywords: 90C10 ; Matching problem ; assignment problem ; computational results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir zeigen wie optimale „Fractional Matchings”, d. h. optimale Lösungen der LP-Relaxation des Matching-Problems, benutzt werden können, um Ausgangslösungen für die kürzeste erweiternde Wege-Methode zur Lösung des Matching-Problems zu konstruieren. Numerische Untersuchungen zeigen, daß diese Startprozedur höchst effizient ist und den Aufwand für den eigentlichen Matching-Algorithmus signifikant reduziert, so daß die Gesamtrechenzeit drastisch reduziert wird.
    Notes: Abstract We show how optimal fractional matchings can be used to start the shortest augmenting path method for solving the (integer) matching problem. Computational results are presented which indicate that this start procedure is highly efficient, i.e. it is fast and reduces the amount of work for the shortest augementing path method significantly such that the overall computing time is reduced drastically.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 17 (2000), S. 113-119 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We study the feasibility of measuring the semi-exclusive photon production $\gamma + p \to \gamma + Y$ at HERA. The cross section of photons produced at large transverse momenta, recoiling off an inclusive system Y of limited mass, can without photon isolation cuts simply be expressed in terms of hard PQCD subprocesses and standard target parton distributions. With the help of event generators we identify the kinematic region where quark and gluon fragmentation processes can be neglected. The cross section in this semi-exclusive region is large enough to be measured with an upgraded HERA luminosity of ${\cal L} = 100 {\mathrm{pb}}^{-1}$ . The subprocesses of lowest order in $\alpha_{\mathrm{s}}$ are suppressed at low recoil masses $M_Y$ , compared to higher order gluon exchange, i.e. BFKL contributions. The distinct $M_Y$ -dependence makes it possible to determine experimentally the kinematic range where the higher order processes dominate.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 30 (1986), S. A181 
    ISSN: 1432-5217
    Keywords: assignment problem ; augmenting path method ; outpricing ; re-optimization phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Wir beschreiben einen sogenannten “In-Core/Out-of-Core” Ansatz auf der Basis der kürzesten erweiternden Wege Methode für die Lösung gro\er Zuordnungsprobleme, für die die gesamte Kostenmatrix nicht im Zentralspeicher des Rechners gehalten werden kann. Bei diesem Ansatz wird in einer ersten Phase ein Zuordnungsproblem über einem dünnen Teilgraph optimal gelöst. In einer zweiten Phase werden dann die nicht berücksichtigen Kanten mittels der optimalen Duallösung bewertet (“outpricing”) und gegebenenfalls eine Reoptimierung durchgeführt. Durch Anwendung spezieller Strategien wird es möglich, während der gesamten Lösung den im Zentralspeicher abzuspeichernden Teilgraphen dünn zu halten. Weiterhin zeigt sich, da\ dieser Ansatz zu einem neuen Verfahren führt, das der zugrunde liegenden kürzesten erweiternden Wege Methode überlegen ist.
    Notes: Abstract We describe how the shortest augmenting path method can be used as basis for a so called “in-core/out-of-core” approach for solving large assignment problems in which the data cannot be kept in central memory of a computer. Here we start by solving the assignment problem on a sparse subgraph and then we introduce the remaining edges in an outpricing/reoptimization phase. We introduce several strategies which enable to keep the working subgraph sparse throughout the procedure and even lead to an all in-core code which is faster than the basic shortest augmenting path code.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 125 (1943), S. 155-156 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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