This paper addresses the multiple criteria flight gate assignment problem under uncertainty, which is naturally modeled by fuzzy numbers. The problem examined is a special kind of multicriteria multi-mode resource-constrained project scheduling problem with generalized precedence constraints or...

Die Aufwendungen für Online-Werbung sind in den vergangenen Jahren rasant gewachsen. Ihr Anteil am gesamten deutschen Werbemarkt lag 2007 bei sieben Prozent und die Tendenz zeigt weiter steil nach oben. Der Versuch von Microsoft, den weltweit zweitgrößten Suchmaschinenbetreiber, Yahoo, zu...

In this paper, we introduce a linearity test for fuzzy rule-based models in the framework of time series modeling. To do so, we explore a family of statistical models, the regime switching autoregressive models, and the relations that link them to the fuzzy rule-based models. From these...

In order to group the observations of a data set into a given number of clusters, an 'optimal' subset out of a greater number of explanatory variables is to be selected. The problem is approached by maximizing a quality measure under certain restrictions that are supposed to keep the subset most...

Using the statistical technique of fuzzy clustering, regimes of inflation and unemployment are explored for the United States, the United Kingdom and Germany between 1871 and 2009. We identify for each country three distinct regimes in inflation/unemployment space. There is considerable...

Neural networks (NN) and fuzzy logic systems (FLS) are used successfully for financial forecasting, credit rating and portfolio management. In search for more sophisticated modeling techniques a mixture of NN and FLS has proved to be worth consideration. We propose the novel constructive...

The transition to market economy has represented both for Romania and other Central and Eastern European countries an emphasis on economic and social inequalities. The authors consider it is necessary to identify a path pass from chaotic inequalities to a state of economic and social cohesion...

This study examines the enduring spatial and racial dimensions of poverty and deprivation in South Africa to assess the progress made by the post-apartheid society and state. A multi-dimensional approach is required to assess progress because it can reflect the reduction in deprivation...

In operations and service management generating revenues is as important as reducing costs. Although logistics customer service is an important measure for executives, little research has been conducted to quantify the extent to which improvements of service levels contribute to a company's...