Fuzzy Random Weighted Weber Problems in Facility Location

This article considers facility location in a Weber problem with weights including both uncertainty and vagueness. By representing its weights as fuzzy random variables, it can be extended to a fuzzy random weighted Weber problem, and then formulated as a fuzzy random programming problem. By introducing possibility and necessity measures and chance constraints, the extended problem is reformulated to new two types of Weber problems. Based upon characteristics of facility location, theorem for solving the reformulated problems are shown

Monte Carlo Simulation to Compare Markovian and Neural Network Models for Reliability Assessment in Multiple AGV Manufacturing System

We compare two approaches for a Markovian model in flexible manufacturing systems (FMSs) using Monte Carlo simulation. The model which is a development of Fazlollahtabar and Saidi-Mehrabad (2013), considers two features of automated flexible manufacturing systems equipped with automated guided vehicle (AGV) namely, the reliability of machines and the reliability of AGVs in a multiple AGV jobshop manufacturing system. The current methods for modeling reliability of a system involve determination of system state probabilities and transition states. Since, the failure of the machines and AGVs could be considered in different states, therefore a Markovian model is proposed for reliability assessment. The traditional Markovian computation is compared with a neural network methodology. Monte Carlo simulation has verified the neural network method having better performance for Markovian computations.We compare two approaches for a Markovian model in flexible manufacturing systems (FMSs) using Monte Carlo simulation. The model which is a development of Fazlollahtabar and Saidi-Mehrabad (2013), considers two features of automated flexible manufacturing systems equipped with automated guided vehicle (AGV) namely, the reliability of machines and the reliability of AGVs in a multiple AGV jobshop manufacturing system. The current methods for modeling reliability of a system involve determination of system state probabilities and transition states. Since, the failure of the machines and AGVs could be considered in different states, therefore a Markovian model is proposed for reliability assessment

Cooperative and strategic games in network economics

Es ist wohlbekannt, dass die Taten und Entscheidungen jedes handelten Subjektes - sei es ein einzelnes Individuum, eine Organisation oder sogar ein ganzes Land - sich unweigerlich mit den Handlungen anderer Subjekte verknüpfen und diese sich untereinander beeinflussen. In Abhängigkeit des jeweiligen Kontextes induzieren diese gegenseitigen Interdependenzen netzwerkartige Beziehungsgeflechte, die in vielfältigen Formen auftreten können. Da dieses Phänomen insbesondere im Ökonomischen Alltag zu finden ist, wurde der Theorie ökonomischer Netzwerke in den vergangenen Jahren ein stetig steigendes Maß an Aufmerksamkeit zuteil. Das Ziel dieser Dissertation ist nun, kooperative und strategische Spiele in der Netzwerktheorie näher zu beleuchten und diesen Aspekt zu ergänzen. Genauer: Die Hauptmotivation besteht darin, ausgewählte ökonomischen Probleme, die in diesem Forschungszweig behandelt werden, realistischer zu modellieren, um das Feld der möglichen Anwendungen zu erweitern. Dies wird durch eine flexiblere Gestaltung der Grundstruktur der Standardansätze umgesetzt.It is a well-accepted fact that doings and decisions of virtually every acting subject - whether it is an individual, an organization, or even an entire country - do inevitably influence and connect to the actions of other subjects. Depending on the context, these mutual interdependencies induce network-like relationships which may take various forms. Consequently, since the phenomenon occurs in many situations of economic life, for many years now more and more attention has been devoted to the study of economic networks and the number of publications dealing with this subject is continuously increasing. The objective of this thesis is to highlight cooperative as well as strategic games in this field of research in order to explore this aspect in more detail and to complement it by analyzing issues which have not been covered so far. More precisely: The main goal is to model the economic problems addressed in network economics more realistically in order to enlarge the field of possible applications. This is done by allowing for more flexibility in the formal substructure of the standard approaches.Tag der Verteidigung: 26.05.2014Paderborn, Univ., Diss., 201