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EasyMSG : tools and techniques for an adaptive overlapping in SPMD programming

Pascal Havé (2002)

ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique

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...

Economic assessment of the Champagne wine qualitative stock mecanism

Jacques Laye, Maximilien Laye (2006)

RAIRO - Operations Research

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...

Editorial

C. Artigues, D. Feillet, P. Michelon (2006)

RAIRO - Operations Research - Recherche Opérationnelle

Efficiency evaluation of closed-loop supply chains with proportional dual-role measures

Monireh Jahani Sayyad Noveiri, Sohrab Kordrostami, Alireza Amirteimoori (2020)

Kybernetika

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...

Efficient and local efficient solutions for assignment type problems

Jacques A. Ferland, Pina Marziliano (2001)

RAIRO - Operations Research - Recherche Opérationnelle

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.

Efficient and Local Efficient Solutions for Assignment Type Problems

Jacques A. Ferland, Pina Marziliano (2010)

RAIRO - Operations Research

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.

Eigenspace of a circulant max–min matrix

Martin Gavalec, Hana Tomášková (2010)

Kybernetika

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.

El conjunto eficiente en problemas de localización con normas mixtas (Lp).

Emilio J. Carrizosa Priego, Francisco Ramón Fernández García (1991)

Trabajos de Investigación Operativa

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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