In this paper, we use a reformulation of the symmetric and the asymmetric travelling salesman problem more suitable for Lagrangean relaxation and analyse the new approach on examples from TSP Lib. Furthermore the Lagrangean relaxed subproblems are travelling salesman alike which means that...

In this paper we analyse the impact of different grazing policies on number of dairy cows in different grazing categories in 2025 by model simulation in the Netherlands. It can be generally concluded that in the absence of intervention there is a strong tendency towards a decline in grazing on...

In this paper, we propose an oscillation strategy heuristic combined with mathematical programming for disruption management in the airline industry (DMAI). The goal of this problem is to resume normal operations as quickly as possible during the recovery period while minimising the resulting...

In this paper, we implement an estimation procedure for a particular mathematical programming activity-based model in order to estimate the relative importance of factors associated with spatial and temporal interrelationships among the out-of-home activities that motivate a household’s...

Sustainable management of natural resources and climate action together form one of the three objectives of the Common Agricultural Policy (CAP) 2014–2020. They are addressed by replacing the existing direct payments under Pillar 1 with a basic payment topped up by an additional payment...

While climate change is widely regarded as a threat to food security in southern Africa, few studies attempt to link the science of climate change impacts on agriculture with the specificities of smallholder livelihoods. In this paper, we build a series of linear programming (LP) farm-household...

This article investigates the role of greenhouse gas (GHG) offset payment design on abatement efficiency in agriculture. We develop a regionally disaggregated positive mathematical programming model of California agriculture calibrated to economic and agronomic information. Regional yield and...

Recently Beltrán-Royo, Vial & Alonso-Ayuso (2012) presented a semi-Lagrangean relaxation for the classical p-median location problem and for the incapacitated facility location problem. The results, obtained using the semi-Lagrangean relaxation approach, were quite impressive. In this paper we...

In this paper, a model for the airlines’ optimal fuel management strategies is presented. The model determines the optimal amount of ferry fuel to be loaded at each airport for a given aircraft route. The problem is formulated in the form of a mathematical program with an objective...

The value of an innovative new seed technology is evaluated in a discrete stochastic programming framework for a representative farm in the northern Corn Belt. Temperature-activated polymer coated seed has the potential to increase net returns by reducing yield loss due to delayed planting and...