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During the development of a parallel solver for Maxwell equations by integral formulations and Fast Multipole Method (FMM), we needed to optimize a critical part including a lot of communications and computations. Generally, many parallel programs need to communicate, but choosing explicitly the way and the instant may decrease the efficiency of the overall program. So, the overlapping of computations and communications may be a way to reduce this drawback. We will see a implementation of this techniques...
In the wine AOC system, the regulation of quantities performed by the
professional
organizations is aimed to smooth the variations of the quality of the
wine due to the
variations in the climate that affect the quality of the grapes.
Nevertheless, this regulation
could be damaging to the consumers due to the price increase resulting
from the reduction of
the quantities sold on the market. We propose a stochastic control
model and a simulation tool
able to measure the effects of this mechanism...
Data Envelopment Analysis (DEA) is a beneficial mathematical programming method to measure relative efficiencies. In conventional DEA models, Decision Making Units (DMUs) are usually considered as black boxes. Also, the efficiency of DMUs is evaluated in the presence of the specified inputs and outputs. Nevertheless, in real-world applications, there are situations in which the performance of multi-stage processes like supply chains with forward and reverse flows must be measured such that some...
In this paper, we analyse the multiobjective problem generated by applying a goal programming approach to deal with linear assignment type problem. We specify sufficient conditions for a solution to be efficient for this problem. The notion of efficiency with respect to a neighborhood is also introduced and characterized through sufficient conditions. Unfortunately, these conditions are not necessary in general.
In this paper, we analyse the multiobjective problem generated by
applying a goal programming approach to deal with linear
assignment type problem. We specify sufficient conditions for a
solution to be efficient for this problem. The notion of
efficiency with respect to a neighborhood is also introduced and
characterized through sufficient conditions. Unfortunately, these
conditions are not necessary in general.
The eigenproblem of a circulant matrix in max-min algebra is investigated. Complete characterization of the eigenspace structure of a circulant matrix is given by describing all possible types of eigenvectors in detail.
En el presente trabajo establecemos una nueva aproximación a la solución del problema de localización con normas mixtas a través de las direcciones de proyección.Probamos que el cierre octogonal de los puntos de demanda es una buena aproximación para el conjunto de puntos eficientes cuando el problema está formulado como un problema multiobjetivo con normas mixtas tipo lp. Demostramos que esta cota es alcanzable, dando condiciones para que ello ocurra, lo que es de gran importancia para el caso...
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