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Mostrando ítems 441-450 de 504
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Reduced bootstrap for the median
(Academia Sinica (Institute of Statistical Science), 2004-10)
In this paper we study a modified bootstrap that consists of only considering those bootstrap samples satisfying k1 ≤ νn ≤ k2, for some 1 ≤ k1 ≤ k2 ≤ n, where νn is the number of distinct original observations in the ...
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A discretization result for some optimization problems in framework spaces with polyhedral obstacles and the Manhattan metric
(Elsevier, 2018-07)
In this work we consider the shortest path problem and the single facility Weber location problem in any real space of finite dimension where there exist different types of polyhedral obstacles or forbidden regions. These ...
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Continuous location problems and Big Triangle Small Triangle: constructing better bounds
(Springer, 2009-11)
The Big Triangle Small Triangle method has shown to be a powerful global optimization procedure to address continuous location problems. In the paper published in J. Global Optim. (37:305–319, 2007), Drezner proposes a ...
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Generalized goal programming: polynomial methods and applications
(Springer, 2002-12)
In this paper we address a general Goal Programming problem with linear objectives, convex constraints, and an arbitrary componentwise nondecreasing norm to aggregate deviations with respect to targets. In particular, ...
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Fiabilidad y validez de la escala de actitudes hacia el medio ambiente natural para adolescentes (Aman-a)
(UNED, 2020-05-29)
El objetivo de este trabajo fue construir y validar una escala de actitudes hacia el medio ambiente natural en adolescentes españoles. Se generaron 72 ítems a partir de los escritos de 264 adolescentes sobre actitudes ...
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Chasing cardiac physiology and pathology down the CaMKII cascade
(American Physiological Society, 2015-05-15)
Calcium dynamics is central in cardiac physiology, as the key event leading to the excitation-contraction coupling (ECC) and relaxation processes. The primary function of Ca2+ in the heart is the control of mechanical ...
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Conducta violenta en adolescentes escolarizados: un modelo estructural predictivo
(Pontificia Universidad Javeriana, Bogota, 2017-12-10)
El objetivo del presente estudio fue analizar la participación de los adolescentes en conductas violentas, a partir de un modelo estructural, en una muestra aleatoria y estratificada de 1 498 estudiantes de 5.º y 6.º ...
Artículo
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A flexible model and efficient solution strategies for discrete location problems
(Elsevier, 2009-03-06)
Flexible discrete location problems are a generalization of most classical discrete locations problems like p-median or p-center problems. They can be modeled by using so-called ordered median functions. These functions ...
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New efficiency conditions for multiobjective interval-valued programming problems
(Elsevier, 2017)
In this paper, we focus on necessary and sufficient efficiency conditions for optimization problems with multiple objectives and a feasible set defined by interval-valued functions. A new concept of Fritz-John and ...