The multicommodity network flow problem is a classical issue in network optimization, where the objective is to route multiple commodities through interconnected nodes and arcs to minimize the overall flow cost. However, in practical scenarios, parameters such as arc capacities, node demands,...

The multi-commodity network flow problem (MCNF) consists in routing a set of commodities through a capacitated network at minimum cost and is relevant for routing containers in liner shipping networks. As commodity transit times are often a critical factor, the literature has introduced hard...

En un sistema formado por una red de nodos emisores y receptores de información, es necesario conocer el estado de señal que tendría cada uno de esos nodos en todo momento con el fin de lograr un flujo de información adecuado. El objetivo de este trabajo es obtener un modelo matemático que...

Despite the importance of trade facilitation as an area of trade and development policy, there have been very few impact evaluations of specific trade facilitation reforms. This paper offers an evaluation of in-house clearance, a reform that allows qualified firms in Serbia to clear customs from...

In this paper we study the dynamics of economic growth for 140 countries during the period 1951-2003. The variables representing economic performance are levels and growth rates of per capita GDP. Using the concept of economic regime, we introduce a notion of distance between the dynamical paths...

We study optimal transport networks in spatial equilibrium. We develop a framework consisting of a neoclassical trade model with labor mobility in which locations are arranged on a graph. Goods must be shipped through linked locations, and transport costs depend on congestion and on the...

We study optimal transport networks in spatial equilibrium. We develop a framework consisting of a neoclassical trade model with labor mobility in which locations are arranged on a graph. Goods must be shipped through linked locations, and transport costs depend on congestion and on the...

Longitudinal network data are increasingly available, allowing researchers to model how networks evolve over time and to make inference on their dependence structure. In this paper, a dynamic latent space approach is used to model directed networks of monthly interbank exposures. In this model,...

One of the most challenging jobs that any managers take is the management of projects that require coordinating numerous activities throughout the organization. A myriad of details must be considered in planning how to coordinate all these activities, in developing a realistic schedule, and then...

Ohne weitere Effizienzsteigerungen sind Krankenhäuser in Deutschland langfristig weder dem finanziellenDruck noch den Herausforderungen des demographischen Wandels gewachsen. Zur Unterstützung von Ressourcenkapazitätsentscheidungen auf strategischer, taktischer und operativer Ebene wird in...

The time–cost tradeoff problem is one of the most important and applicable problems in project scheduling area. There are many factors that force the mangers to crash the time. This factor could be early utilization, early commissioning and operation, improving the project cash flow, avoiding...

Despite the importance of trade facilitation as an area of trade and development policy, there have been very few impact evaluations of specific trade facilitation reforms. This paper offers an evaluation of in-house clearance, a reform that allows qualified firms in Serbia to clear customs from...

One of the main objectives of network analysis is to determine the duration required to complete a project. This implies that how long a project will or can take for its completion. Hence, this paper has aim to provide a clear understanding about the determination of duration and other related...

"Site selection bias" can occur when the probability that a program is adopted or evaluated is correlated with its impacts. I test for site selection bias in the context of the Opower energy conservation programs, using 111 randomized control trials involving 8.6 million households across the...

Standardlehrwerk zu bewährten und neueren Verfahren der Netzplantechnik. Zentrales Thema im OR und im Projektmanagement. Für Betriebswirte, Ingenieure, Architekten u.a. Aus dem Inhalt: Wesen, Bedeutung und Grenzen der Netzplantechnik. Projektstrukturierung, Zeitplanung und Projektüberwachung...

The health of a global supply network (GSN) plays an important role in the effective and timely delivery of complex products and services. Decision makers are in need of a holistic approach inclusive of several aspects affecting GSN performance, moving beyond traditional approaches that limit...

"Site selection bias" can occur when the probability that a program is adopted or evaluated is correlated with its impacts. I test for site selection bias in the context of the Opower energy conservation programs, using 111 randomized control trials involving 8.6 million households across the...

This paper uses data from the Greater Avenues for Independence (GAIN) demonstration to discuss the evaluation of programs that are implemented at multiple sites. Two frequently used methods are pooling the data or using fixed effects (an extreme version of which estimates separate models for...