Resource management are problems on how and when to optimally utilize the limited available resources. Some examples of
these resources are vehicles (e.g. planes and trucks), trailers, rail cars, locomotives, containers, equipments, crew, power, etc. Once
a resource is allocated to an activity, it is no longer available for certain duration. Moreover, when it becomes available again, it is
often at a different location where it is not needed (Crainic,2003). Empty loading unit repositioning and fleet management
problems are more specific variants of resource management problems.