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  • 1
    Digitale Medien
    Digitale Medien
    Nonlinear coordinate transformations for unconstrained optimization II. Theoretical background (1993)
    Springer
    Journal of global optimization 3 (1993), S. 359-375 
    Details
    ISSN: 1573-2916
    Schlagwort(e): Global optimization ; smooth unconstrained optimization ; geodesic convexity ; unimodal function ; nonlinear coordinate transformation ; 65K05 ; 90C30 ; 54H00
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract In this two-part article, nonlinear coordinate transformations are discussed in order to simplify global unconstrained optimization problems and to test their unimodality on the basis of the analytical structure of the objective functions. If the transformed problems can be quadratic in some or all the variables, then the optimum can be calculated directly, without an iterative procedure, or the number of variables to be optimized can be reduced. Otherwise, the analysis of the structure can serve as a first phase for solving global unconstrained optimization problems. The first part treats real-life problems where the presented technique is applied and the transformation steps are constructed. The second part of the article deals with the differential geometrical background and the conditions of the existence of such transformations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01096776
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  • 2
    Digitale Medien
    Digitale Medien
    Multisection in Interval Branch-and-Bound Methods for Global Optimization – I. Theoretical Results (2000)
    Springer
    Journal of global optimization 16 (2000), S. 371-392 
    Details
    ISSN: 1573-2916
    Schlagwort(e): Branch-and-bound method ; Global optimization ; Interval arithmetic ; Multisection ; Accelerating devices
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We have investigated variants of interval branch-and-bound algorithms for global optimization where the bisection step was substituted by the subdivision of the current, actual interval into many subintervals in a single iteration step. The convergence properties of the multisplitting methods, an important class of multisection procedures are investigated in detail. We also studied theoretically the convergence improvements caused by multisection on algorithms which involve the accelerating tests (like e.g. the monotonicity test). The results are published in two papers, the second one contains the numerical test result.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008354711345
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    On the selection of subdivision directions in interval branch-and-bound methods for global optimization (1995)
    Springer
    Journal of global optimization 7 (1995), S. 183-207 
    Details
    ISSN: 1573-2916
    Schlagwort(e): Global optimization ; interval arithmetic ; branch-and-bound ; interval subdivision
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract This paper investigates the influence of the interval subdivision selection rule on the convergence of interval branch-and-bound algorithms for global optimization. For the class of rules that allows convergence, we study the effects of the rules on a model algorithm with special list ordering. Four different rules are investigated in theory and in practice. A wide spectrum of test problems is used for numerical tests indicating that there are substantial differences between the rules with respect to the required CPU time, the number of function and derivative evaluations, and the necessary storage space. Two rules can provide considerable improvements in efficiency for our model algorithm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01097060
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Multisection in Interval Branch-and-Bound Methods for Global Optimization II. Numerical Tests (2000)
    Springer
    Journal of global optimization 16 (2000), S. 219-228 
    Details
    ISSN: 1573-2916
    Schlagwort(e): Branch-and-bound method ; Global optimization ; Interval arithmetic ; Multisection ; Accelerating devices
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We have investigated variants of interval branch-and-bound algorithms for global optimization where the bisection step was substituted by the subdivision of the current, actual interval into many subintervals in a single iteration step. The results are published in two papers, the first one contains the theoretical investigations on the convergence properties. An extensive numerical study indicates that multisection can substantially improve the efficiency of interval global optimization procedures, and multisection seems to be indispensable in solving hard global optimization problems in a reliable way.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008359223042
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Nonlinear coordinate transformations for unconstrained optimization I. Basic transformations (1993)
    Springer
    Journal of global optimization 3 (1993), S. 213-221 
    Details
    ISSN: 1573-2916
    Schlagwort(e): Global optimization ; nonlinear parameter transformation ; unconstrained optimization ; unimodal function
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract In this two-part article, nonlinear coordinate transformations are discussed to simplify unconstrained global optimization problems and to test their unimodality on the basis of the analytical structure of the objective functions. If the transformed problems are quadratic in some or all the variables, then the optimum can be calculated directly, without an iterative procedure, or the number of variables to be optimized can be reduced. Otherwise the analysis of the structure can serve as a first phase for solving unconstrained global optimization problems. The first part treats real-life problems where the presented technique is applied and the transformation steps are constructed. The second part of the article deals with the differential geometrical background and the conditions of the existence of such transformations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01096739
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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