Freight transportation has long been recognized as an important foundation of economic strength. Previous studies use traditional methods to examine a set of scenarios. However, due to the complexity of transportation projects which can have substitution effects in a network the number of resulting scenarios may be more than can be examined on a case by case basis. In this paper, a sequential s...

Path flow estimator ~PFE! is a one-stage network observer proposed in the transportation literature to estimate path flows and path travel times from traffic counts in a transportation network. The estimated path flows can further be aggregated to obtain the origin–destination sO–Dd flows, which are usually required in many transportation applications. In this paper, we examine the capability o...

We consider the single-commodity single-origin fixed-charge network flow problem (SSFNP) defined on a directed network G = (V,A), where V is the node set and A is the arc set, with each arc a represented by the ordered pair of head and tail nodes (h(a), t(a)). The node set includes a single origin (with no incoming arc), multiple destinations (with no outgoing arc) and transshipment nodes (with...

Traditionally, the design of a transportation system has focused on one of the two systems that comprise the transportation architecture, the vehicle or the network design. However, to define a systems level architecture for a transportation system, it is necessary to expand the system definition during the design process to include the network definition, the vehicle architecture, and the oper...

1DEI, University of Bologna, Viale Risorgimento 2, I-40136, Bologna, Italy, {valentina.cacchiani,andrea.lodi}@unibo.it 2Institut für Informatik, Universität zu Köln, Albertus-Magnus-Platz, 50923 Köln, Germany, {mjuenger,schmidt}@informatik.uni-koeln.de 3Department Mathematik, Friedrich-Alexander Universität Erlangen-Nürnberg, Cauerstraße 11, 91058 Erlangen, Germany, [email protected]...

Hubs, or central trans-shipment facilities, allow the construction of a network where large numbers of direct connections can be replaced with fewer, indirect connections. Hub-andspoke configurations reduce and simplify network construction costs, centralize commodity handling and sorting, and allow carriers to take advantage of scale economies through consolidation of flows. Such networks have...

This paper presents a theoretical view of imperfect market. It concludes that an increase in the price of products does not give any incentive to increasing production which shows the mechanism for upward trends in prices.

Logistical planning problems are complicated in practice because planners have to deal with the challenges of demand planning and supply replenishment, while taking into account the issues of (i) inventory perishability and storage charges, (ii) management of backlog and/or lost sales, and (iii) cost saving opportunities due to economies of scale in order replenishment and transportation. It is...