The Ward error sum of squares hierarchical clustering method has been very widely used since its first description by Ward in a 1963 publication. It has also been generalized in various ways. Two algorithms are found in the literature and software, both announcing that they implement the Ward clustering method. When applied to the same distance matrix, they produce different results. One algori…
The3DContainershipLoadingPlanProblem(CLPP)isanimportantproblemthatappearsinseaportcontainerterminaloperations.Thisproblemconsistsofdetermininghowtoorganizethecontainersinashipinordertominimizethenumberof ovementsnecessarytoloadandunloadthecontainershipandtheinstabilityoftheshipineachport.TheCLPPiswellknowntobeNP hard.Inthispaper,thehybridmethodParetoClusteringSearch(PCS)isproposedtosolvetheCLPP…
The challenges faced by electricity grids suggest smart grids will have to coordinate its operation with other important initiatives in areas such as transportation. The smart grid relies on the use of network platforms where meter readings and data can be transmitted. On the other hand, concerning transportation systems the need to achieve a reduction of road congestion and traffic accidents …
The purpose of this paper is to develop a risk assessment method for production processes of large-size steel ship hulls
While maritime transport ensures about 90% of world trade volumes, it has not yet attracted as much attention as other transport systems from a graph perspective. As a result, the relative situation and the evolution of seaports within maritime networks are not well understood. This paper wishes verifying to what extent the hub-and-spoke strategies of ports and ocean carriers have modified the …
The purpose of this paper is to construct a realistic best practice benchmark and develop a methodology for comparison of individual suppliers of marine bunker fuel. As is well-known in this trade, unfair business behaviors in the bunker fuel market are not uncommon, resulting in financial losses for the buyers