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  • Electronic Resource  (8)
  • 34.90  (3)
  • 23.20  (2)
  • cluster analysis  (2)
  • genetic algorithms  (2)
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  • Electronic Resource  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Experiences with applying a genetic algorithm to determine an information systems architecture (1997)
    Springer
    OR spectrum 19 (1997), S. 47-53 
    Details
    ISSN: 1436-6304
    Keywords: Information systems architecture ; business Systems planning ; cluster analysis ; genetic algorithms ; Architektur von Informationssystemen ; Business Systems Planning ; Cluster-Analyse ; Genetische Algorithmen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Zur Entwicklung von Architekturen von Informationssystemen (ISA) wird vielfach das Business-Systems-Planning-(BSP)-Konzept vorgeschlagen. Ein Teilproblem dieses Planungskonzepts besteht darin, unter Berücksichtigung von Optimalitätskriterien Unternehmensprozesse und Datenbestände zu möglichst voneinander unabhängigen Teilsystemen zusammenzufassen. Da die Leistungsgrenzen von exakten Optimierungsverfahren für dieses Problem rasch erreicht werden, interessiert der Einsatz von heuristischen Verfahren. Zunächst werden das BSP-Problem und die Vorgehensweise genetischer Algorithmen kurz erläutert. Danach wird die Anwendung eines einfachen genetischen Algorithmus auf das BSP-Problem beschrieben. Ein Vergleich mit Ergebnissen exakter Verfahren bildet einen weiteren wichtigen Bestandteil der Untersuchung.
    Notes: Abstract While determining information systems architectures (ISA), business systems planning (BSP) is a well-known method to join processes and data classes to subsystems. BSP matrices have generally been rearranged without describing the underlying methods. Meanwhile, various techniques have been developed for solving the ISA problem. Since exact optimization methods often fail to provide results for large ISA problems, different heuristics have been applied. A new heuristic for solving the ISA problem is the application of genetic algorithms (GA). This paper examines the application of a simple GA to the ISA problem and compares the results of applying the GA with those obtained by exact methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539808
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Experiences with applying a genetic algorithm to determine an information systems architecture (1997)
    Springer
    OR spectrum 19 (1997), S. 47-53 
    Details
    ISSN: 1436-6304
    Keywords: Key words: Information systems architecture ; business systems planning ; cluster analysis ; genetic algorithms ; Schlüsselwörter: Architektur von Informationssystemen ; Business Systems Planning ; Cluster-Analyse ; Genetische Algorithmen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung. Zur Entwicklung von Architekturen von Informationssystemen (ISA) wird vielfach das Business-Systems-Planning-(BSP)-Konzept vorgeschlagen. Ein Teilproblem dieses Planungskonzepts besteht darin, unter Berücksichtigung von Optimalitätskriterien Unternehmensprozesse und Datenbestände zu möglichst voneinander unabhängigen Teilsystemen zusammenzufassen. Da die Leistungsgrenzen von exakten Optimierungsverfahren für dieses Problem rasch erreicht werden, interessiert der Einsatz von heuristischen Verfahren. Zunächst werden das BSP-Problem und die Vorgehensweise genetischer Algorithmen kurz erläutert. Danach wird die Anwendung eines einfachen genetischen Algorithmus auf das BSP-Problem beschrieben. Ein Vergleich mit Ergebnissen exakter Verfahren bildet einen weiteren wichtigen Bestandteil der Untersuchung.
    Notes: Abstract. While determining information systems architectures (ISA), business systems planning (BSP) is a well-known method to join processes and data classes to subsystems. BSP matrices have generally been rearranged without describing the underlying methods. Meanwhile, various techniques have been developed for solving the ISA problem. Since exact optimization methods often fail to provide results for large ISA problems, different heuristics have been applied. A new heuristic for solving the ISA problem is the application of genetic algorithms (GA). This paper examines the application of a simple GA to the ISA problem and compares the results of applying the GA with those obtained by exact methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539808
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Average charge state dependence in atomic spin precessions of fluorine ions emerging from iron and copper (1985)
    Springer
    The European physical journal 322 (1985), S. 13-17 
    Details
    ISSN: 1434-601X
    Keywords: 31.30.Gs ; 29.25 ; 23.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The technique of perturbedγ-angular correlation has been applied to measure atomic spin precessions of nuclear excited fluorine ions on recoil through vacuum in a weak transverse magnetic field. The ions were allowed to emerge from thin iron or copper backed targets and were stopped after flight through vacuum in a Ag foil. The differing precessions observed are attributed to different average charge states of the ions on emergence from the two target backings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412012
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Measurements of theg-factor ratio of the first 3− and 5− states in40Ca and the lifetime of the 5− state (1987)
    Springer
    The European physical journal 327 (1987), S. 157-161 
    Details
    ISSN: 1434-601X
    Keywords: 21.10ky ; 21.60Jz ; 27.40 + z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract [Theg-factor ratio of the first excited 3− and 5− states in40Ca was measured to beg 3/g 5=1.01(10) employing the implantation perturbed angular correlation technique. The static hyperfine fields (SF) in Fe and Gd hosts were used. In addition the lifetime of the 5− state was measured to be τ=426(7)ps. The values of the SF in Gd and Fe hosts were deduced and compared with systematics in this element region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292404
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Strong enhancement of transient magnetic fields in Gd over Fe for oxygen ions at high velocities (1986)
    Springer
    The European physical journal 1 (1986), S. 363-372 
    Details
    ISSN: 1434-6079
    Keywords: 34.00 ; 34.80B ; 34.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Precision data on transient magnetic fields (TF) in ferromagnetic Gd and Fe were obtained for oxygen ions at velocities between 2 and 8v 0 (v 0=c/137) using the16O(3−) state as probe. At the high velocities the TF in Gd were found to be twice as large as in Fe which is in contrast to the generally observed scaling with the polarization density of the hosts. Degrees of polarization could be deduced from TF strengths using measured ion fractions of singly occupiedK-shell. The values derived were compared with theoretical estimates based on spin exchange scattering as a possible polarization mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01431178
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Attenuations and atomic spin precessions of γ-angular correlations for coulomb excited19F nuclei in single-electron ions (1987)
    Springer
    The European physical journal 4 (1987), S. 329-334 
    Details
    ISSN: 1434-6079
    Keywords: 31.30.Gs ; 29.25 ; 23.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Attenuated γ-angular correlations and atomic spin precessions were measured for single-electron fluorine ions recoiling through vacuum in weak transverse magnetic fields The Coulomb excited long-lived19F(5/2+) state at 197 keV was used as probe. The angular correlations observed in the focal coordinate system of the Coulomb excitation process as well as the spin precessions in weak external fields are well explained with simple electron configurations associated with the highly stripped ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384884
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Transient field precessions and electron polarizations for sulphur ions at high velocity (1987)
    Springer
    The European physical journal 7 (1987), S. 233-237 
    Details
    ISSN: 1434-6079
    Keywords: 34.00 ; 34.80.B ; 34.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Effective transient magnetic fields have been measured for S ions traversing thin ferromagnetic foils of Fe, Ni and Gd at mean velocities of 8.0v 0 (v 0 =c/137). The deduced polarizations attached to 1s electrons are discussed together with all data available for light ions considering spin exchange scattering as polarization mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384989
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    TransientK-shell hyperfine fields and deduced polarizations for single-electron C and O ions in different ferromagnets (1987)
    Springer
    The European physical journal 6 (1987), S. 43-48 
    Details
    ISSN: 1434-6079
    Keywords: 34.00 ; 34.80B ; 34.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Effective transient magnetic fields have been measured for single-electron carbon and oxygen ions traversing ferromagnetic Ni and Gd hosts, respectively. The deduced values ofK-shell polarization are well explained considering spin exchange scattering as a dominant mode of polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436996
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    Paper (German National Licenses)
    Fulltext
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