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  • Artikel  (151)
  • Mathematik  (151)
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  • Artikel  (151)
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  • 1
    Digitale Medien
    Digitale Medien
    Cambridge, Mass. : Berkeley Electronic Press (now: De Gruyter)
    Studies in nonlinear dynamics and econometrics 4.2000, 2, art1 
    ISSN: 1081-1826
    Quelle: Berkeley Electronic Press Academic Journals
    Thema: Mathematik , Wirtschaftswissenschaften
    Notizen: We investigate business cycle dynamics for 26 countries, estimating a set of nonlinear models for real GDP where appropriate. We find a great deal of heterogeneity in the dynamics of real output growth across countries. At the same time, a common feature is the asymmetric response of real GDP to shocks and the tendency for negative real GDP shocks to be less persistent than positive real GDP shocks.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Games and Economic Behavior 6 (1994), S. 400-415 
    ISSN: 0899-8256
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Mathematik , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of mathematical biology 52 (1990), S. 375-396 
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract Some insect populations exhibit cycles in which successive population peaks may correspond to effectively discrete generations. Motivated by this observation, we investigate the structure of matriarchal generations in five simple, continuous-time, stage structure models in order to determine the proportion of individuals in one population peak who are the offspring of individuals in the pervious peak. We conclude that in certain models (including a model of Nicholson's blowflies) successive population peaks do not correspond to discrete generations, whereas in others (including some models of uniform larval competition) successive peaks may well approximate discrete generations. In all models, however, there is eventually significant overlap of generations.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    ISSN: 1436-4646
    Schlagwort(e): Key words: basis recovery – partition – principal pivot transforms – Balinski-Tucker tableaus – quadratic programming – linear complementarity problems – interior point methods – sufficient matrices – crossover – Criss-Cross method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Mathematik
    Notizen: Abstract. Optimal solutions of interior point algorithms for linear and quadratic programming and linear complementarity problems provide maximally complementary solutions. Maximally complementary solutions can be characterized by optimal partitions. On the other hand, the solutions provided by simplex–based pivot algorithms are given in terms of complementary bases. A basis identification algorithm is an algorithm which generates a complementary basis, starting from any complementary solution. A partition identification algorithm is an algorithm which generates a maximally complementary solution (and its corresponding partition), starting from any complementary solution. In linear programming such algorithms were respectively proposed by Megiddo in 1991 and Balinski and Tucker in 1969. In this paper we will present identification algorithms for quadratic programming and linear complementarity problems with sufficient matrices. The presented algorithms are based on the principal pivot transform and the orthogonality property of basis tableaus.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    ISSN: 1436-6304
    Schlagwort(e): Graph partitioning ; local search ; real timevideo signal processing ; Graphen-Partitionierung ; Lokale Suche ; Real-time Videosignalverarbeitung
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Wirtschaftswissenschaften
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Videoalgorithmen transformieren Videosignale, also die zur Bilderzeugung notwendigen Informationseinheiten, um Bildqualität oder die Möglichkeiten spezieller Features, wie Teletext oder Bild-in-Bild-Wiedergabe, zu erhöhen. Eigene, anwendungsspezifische und häufig nur einem Videoalgorithmus zuteilbare, schnelle Videosignalprozessoren sind für die Ausführung von Videoalgorithmen verantwortlich. Die Zuordnung der Algorithmen und Prozessoren ist, aufgrund der großen Zahl zu beachtender Restriktionen, ein NP-schweres Problem, so daß eine Aufspaltung in die drei Teilprobleme Terminierung, Partitionierung und Scheduling von Operationen sinnvoll wird. In der vorliegenden Arbeit werden das Partitionierungsproblem und die Beschreibung von Videoalgorithmen mittels Signalflußgraphen betrachtet. Ein auf lokaler Suche basierendes Lösungsverfahren erzeugt rekursiv Bipartitionen des Graphen, die komplexe Nachbarschaften variabler Tiefe generieren. Rechenergebnisse zeigen, daß die vielzitierte Universalität und Flexibilität lokaler Suchverfahren erfolgreich zur Lösung schwieriger, stark restringierter Probleme genutzt werden können.
    Notizen: Abstract We discuss the use of local search techniques for mapping video algorithms onto programmable high-performance video signal processors. The mapping problem is very complex due to many constraints that need to be satisfied in order to obtain a feasible solution. The complexity is reduced by decomposing the mapping problem into three subproblems, namely delay management, partitioning, and scheduling. We present the partitioning problem and the representation of video algorithms by signal flow graphs. Furthermore, we propose a solution strategy that is based on recursive bipartitioning of these graphs. The bipartitions are generated using a variable-depth search algorithm. The results demonstrate that the frequently cited flexibility of local search techniques can be successfully exploited in handling complicated problems.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Annals of operations research 62 (1996), S. 197-231 
    ISSN: 1572-9338
    Schlagwort(e): Interior-point method ; primal-dual method ; target-following ; centering ; Dikin steps
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Wirtschaftswissenschaften
    Notizen: Abstract In this paper, we propose a method for linear programming with the property that, starting from an initial non-central point, it generates iterates that simultaneously get closer to optimality and closer to centrality. The iterates follow paths that in the limit are tangential to the central path. Together with the convergence analysis, we provide a general framework which enables us to analyze various primal-dual algorithms in the literature in a short and uniform way.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    BIT 33 (1993), S. 580-595 
    ISSN: 1572-9125
    Schlagwort(e): 05C05 ; 68Q25 ; 68R10 ; algorithmic complexity ; planar layouts ; geometry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The computational complexity of the following type of problem is studied. Given a geometric graphG=(P, S) whereP is a set of points in the Euclidean plane andS a set of straight (closed) line segments between pairs of points inP, we want to know whetherG possesses a crossingfree subgraph of a special type. We analyze the problem of detecting crossingfree spanning trees, one factors and two factors in the plane. We also consider special restrictions on the slopes and on the lengths of the edges in the subgraphs.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Bulletin of Mathematical Biology 52 (1990), S. 375-396 
    ISSN: 0092-8240
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Mathematik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Bulletin of Mathematical Biology 52 (1990), S. 375-396 
    ISSN: 0092-8240
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Mathematik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Computing and visualization in science 3 (2000), S. 47-59 
    ISSN: 1433-0369
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract. A Large Eddy Simulation (LES) formulation is developed from the variational multiscale method. Modeling is confined to the effect of a small-scale Reynolds stress, in contrast with classical LES in which the entire subgrid-scale stress is modeled. All other effects are accounted for exactly. It is argued that many shortcomings of the classical LES/constant-coefficient Smagorinsky model are eliminated by the scale separation inherent ab initio in the present approach.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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