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Modeling the spread of disease through a population
Lauren A. Meyers (contributor) - 2009
As disease spreads through a population, scientists want to know who gets sick, how bestto prevent a large outbreak, and if an epidemic may occur. For many years, mathematicians usedmodels to approximate answers to these questions; however, these older models used simplifyingassumptions about...
Persistent link: https://www.econbiz.de/10009429368
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Robust Statistical Tests for Detecting the Effects of Interspecific Competition on Ecological Communities
Ladau, Joshua - 2005
For seventy years ecologists have debated to what extent competition affects the composition of ecological communities. At one extreme, species have been proposed to assemble independently of each other, while at the other extreme, competition and other interspecific interactions have been...
Persistent link: https://www.econbiz.de/10009466183
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The Price Shock Transmission during the 2007-2008 Commodity Bull Cycle: A Structural Vector Auto-Regression Approach to the "Chicken-or-Egg" Problem
Power, Gabriel J.; Vedenov, Dmitry V. - 2009
Commodity and energy prices have exhibited an unprecedented increase between October 2006 and July 2008, only to fall sharply during the last months of 2008. Many explanations have been offered to this phenomenon, including steadily increasing demand from China and India, large mandated...
Persistent link: https://www.econbiz.de/10009444738
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A new hybrid method for bayesian network learning with dependency constraints
Schulte, Oliver; Frigo, Gustavo; Greiner, Russell; Luo, Wei - 2009
A Bayes net has qualitative and quantitative aspects: The qualitative aspect is its graphical structure that corresponds to correlations among the variables in the Bayes net. The quantitative aspects are the net parameters. This paper develops a hybrid criterion for learning Bayes net structures...
Persistent link: https://www.econbiz.de/10009448619
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Standortplanung für einen privaten Paketdienstleister
Lischak, Christoph - 2001
Standortproblem mathematisch exakt zu lösen. Stattdessen wurde eine speziell angepasste VRPB-Heuristik entwickelt und innerhalb des … werden konnte. Es wurde nachgewiesen, dass die Güte der von der Heuristik berechneten Standortauswahl die manuellen Planungen …
Persistent link: https://www.econbiz.de/10009467411
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Effiziente Lokale Suche für Vehicle Routing und Scheduling Probleme mit Ressourcenbeschränkungen
Funke, Birger - 2003
der Nachbarschaften in eine Meta-Heuristik ist die zugrundeliegende Intention der Untersuchungen, steht aber nicht selbst … gibt zu der Vermutung Anlaß, daß durch eine adäquate Integration der Nachbarschaften in eine Meta-Heuristik leistungsfähige …The development of efficient heuristics for Vehicle Routing and Scheduling Problems has been the subject of many …
Persistent link: https://www.econbiz.de/10009467424
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Dynamische Tourenplanung und -steuerung
Boomgaarden, Christoph - 2007
In dieser Arbeit werden dynamisch-determinstische Tourenplanungsproblemeund dynamisch-stochastische Tourensteuerungsprobleme auf Basis von Verkehrswegenetzwerken beschrieben, modelliert und L?sungsverfahren experimentell untersucht.Zun?chst wird ein neues Modell zur Abbildung von...
Persistent link: https://www.econbiz.de/10009484804
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New tabu search heuristics for the vehicle routing problem with trailers, multiple depots and planning periods
Scheuerer, Stephan - 2004
diese Problemstellung zwei neue Konstruktionsheuristiken sowie eine Tabusuche-Heuristik zur weiteren Lösungsverbesserung …. Für jedes dieser Probleme wurde ebenfalls eine Tabusuche-Heuristik entwickelt und auf existierenden und neuen … heuristics for this problem and to present a tabu search heuristic for further improvement. Computational results indicate that …
Persistent link: https://www.econbiz.de/10009450177
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Sequencing and scheduling in flowshops with task redistribution
Burdett, Robert L.; Kozan, Erhan - 2001
In some manufacturing situations, station tasks or operations can be shifted or redistributed to adjacent stations when adjacent stations have the appropriate equipment and the workers on that station can perform the shifted work to a reasonable level of competency. This paper addresses such an...
Persistent link: https://www.econbiz.de/10009437714