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Flowhop Scheduling mit parallelen Genetischen Algorithmen

Flowhop Scheduling mit parallelen Genetischen Algorithmen

Christian Bierwirth

72,61 €
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Editorial:
Springer Nature B.V.
Año de edición:
1993
Materia
Economía
ISBN:
9783824420513
72,61 €
IVA incluido
Disponible

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rungs problem en in unterschiedlichen wissenschaftlichen Disziplinen anwen­ deten [Gold89. 1, S. 126-130]. Das Optimierungsproblem in seiner allgemeinsten Form ist die Aufgabe Optimiere -+ f (x) , XEM, (10) n n mit f als reellwertiger Funktion des lR und M C lR als Raum aller zulassigen Lasungen. Die Optimierung beliebiger reeller Funktionen unter Verwendung Genetischer Algorithmen wurde zuerst in der Dissertation von de Jong [Jong75] behandelt. Die von ihm experimentell untersuchten unste­ tigen, nichtkonvexen, multimodalen und stochastischen Funktionen dienen in der Literatur seither als Standardprobleme zur Validierung genetischer Optimierungsstrategien, siehe etwa [MSB91]. Wird in der Formulierung der Aufgabe (10) zusatzlich die Ganzzahligkeitsbedingung an die Kompo­ nenten der Lasungsvektoren x gekntipft, so fallt das Problem bekanntlich in den Bereich der kombinatorischen Optimierung. An einem einfachen Beispiel soll das konstruktive Paradigma der genetischen Optimierung ein­ gefiihrt werden. Hierzu werden wir eine der Biologie entlehnte begrifHiche Analogie verwenden, die in Abschnitt 3. 2 zusammenhangend dargestellt wird. Es sei die Aufgabe 2 Max -+ f(x,y)=x -2xy+y2, O:::;x,y:::;k-lmitx,yElN (11) 2 mit k als Zweierpotenz, also z. B. k = 32, gegeben. Jedes der 32 unter­ schiedlichen 2-Tupel, welche als potentielle Optimallasungen der Aufgabe zur Diskussion stehen, bezeichnet den Phanotyp einer zulassigen Lasung. Dieser laBt sich tiber eine Binartransformation in zwei Strings der Lange log2 k darstellen. x) = ( 25 ) 11 1 0 0 1 I (12) ( y 14 -+ 0 1 1 1 0 Die geordnete Menge binarer Strings definiert den Genotypus einer Lasung.

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