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Mostrando ítems 121-130 de 144
Artículo
A note on the optimal positioning of service units
(INST OPERATIONS RESEARCH MANAGEMENT SCIENCES, 1998-02-01)
In this paper we address the problem of locating p mobile service units in an n-dimensional space minimizing the expected response time. It is shown that an optimal solution to the problem is a degenerate distribution for ...
Artículo
The Weber problem with regional demand
(ELSEVIER SCIENCE BV, 1996-12-27)
This paper is devoted to the study of the Regional Weber Problem, an extension of the Weber problem which allows the demand not be concentrated onto a finite set of points. The most serious drawback of this formulation, ...
Artículo
A sparsity-controlled vector autoregressive model
(Oxford University Press, 2017-04)
Vector autoregressive (VAR) models constitute a powerful and well studied tool to analyze multivariate time series. Since sparseness, crucial to identify and visualize joint dependencies and relevant causalities, is not ...
Artículo
Sparsity in optimal randomized classification trees
(ELSEVIER SCIENCE BV, 2019-12-16)
Decision trees are popular Classification and Regression tools and, when small-sized, easy to interpret. Traditionally, a greedy approach has been used to build the trees, yielding a very fast training process; however, ...
Tesis Doctoral
Optimization-based methods for classification and regression problems with imprecise data
(2008)
En esta tesis, desarrollamos varias herramientas para resolver problemas de clasificación y regresión donde los elementos del conjunto de datos no son vectores de características puntuales, sino conjuntos en Rd con ciertas ...
Artículo
On the Selection of the Globally Optimal Prototype Subset for Nearest-Neighbor Classification
(Informs, 2007-07-20)
The nearest-neighbor classifier has been shown to be a powerful tool for multiclass classification. We explore both theoretical properties and empirical behavior of a variant method, in which the nearest-neighbor rule is ...
Artículo
Solving multifacility Huff location models on networks using metaheuristic and exact approaches
(PERGAMON-ELSEVIER SCIENCE LTD, 2016-03-16)
In this paper we consider multifacility Huff facility location problem on networks. First, we introduce a slight modification of the existing mixed integer nonlinear mathematical model and confirm its validity by using the ...
Artículo
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 ...
Artículo
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, ...
Artículo
An Exact Method for Fractional Goal Programming
(Springer, 2004-01-04)
Goal Programming with fractional objectives can be reduced to mathematical programming with a linear objective under linear and quadratic constraints, thus optimal solutions can be obtained by using existing Global ...