OptiNet ist ein objektorientiertes Optimierungswerkzeug für die Lösung von baumförmigen Netzwerkproblemen mit Hilfe von naturanalogen Optimierungsverfahren. In OptiNet können verschiedene naturanaloge Optimierungsverfahren mit unterschiedlichen Problemrepräsentatio-nen (charakteristische...

We propose the use of robust optimization, a powerful tool that has already proven itself in several application areas, to the problem of finding optimal values for quantity exible commitment contracts between suppliers and retailers...

In order to maximize a piecewise affine concave function one can basically use the simplex method or an interior point method. As an alternative, we propose the face simplex method. The vertex to vertex scheme of the simplex method is replaced by a more general face to face scheme in the face...

The class of strongly semicontinuous functions is considered. For these functionsthe notion of mollified derivatives, introduced by Ermoliev, Norkin andWets [8], is extended to the second order. By means of a generalized Taylor'sformula, second order necessary and sufficient conditions are...

Evolution strategies (ES) are efficient optimization methods for continuous problems. However, many combinatorial optimization methods can not be represented by using continuous representations. The development of the network random key representation (Rothlauf et al., 2001) which represents...

A new subdifferential for a locally Lipschitzian function is proposed. Based on this subdifferential, Newton methods and inexact-Newton methods for solving the system of nonsmooth equations and for solving the system of equations of smooth compositions of nonsmooth functions, are developed. The...

A new subdifferential for a locally Lipschitzian function is proposed. Based on this subdifferential, Newton methods and inexact-Newton methods for solving the system of nonsmooth equations and for solving the system of equations of smooth compositions of nonsmooth functions, are developed. The...

-hub center problem is an extension of the deterministicversion which aims to minimize the longest origin-destination path in a hub and spokenetwork. Considering the stochastic nature of travel times on links is important when designing anetwork to guarantee the quality of service measured by a...

Der Beitrag beschreibt gängige Erfahrungen bei der Einführung und Nutzung integrierter ERP-Systeme, eine Vorgehensweise zu deren Auditierung sowie die Analyse von Ursachen nicht zufriedenstellender Performance.