Buscar
Mostrando ítems 281-290 de 504
Artículo
The continuous and discrete path variance problem on trees
(Wiley, 2009-03)
In this paper we consider the problem of locating path-shaped facilities on a tree minimizing the variance objective function. This kind of objective function is generally adopted in location problems which arise in the ...
Tesis Doctoral
Avances sobre el problema de localización continua de un único centro
(1998)
"El objetivo de la Teoría de la Localización consiste en determinar una o varias localizaciones para uno o más servicios con respecto a un conjunto de ubicaciones conocidas a priori, que usualmente denominamos puntos de ...
Artículo
Averaging the k largest distances among n: k-centra in Banach spaces
(Elsevier, 2004-03-15)
Given a Banach space X let A ⊂ X containing at least k points. In location theory, reliability analysis, and theoretical computer science, it is useful to minimize the sum of distances from the k furthest points of A: this ...
Artículo
Estimación de la función de distribución sobre poblaciones finitas mediante diseños muestrales bietápicos apropiados
(Universidad Politécnica de Cataluña, 2002)
Con el objeto de estimar la funcion de distribución de una variable de estudio sobre una población finita, se propone en este trabajo emplear el estimador de Horvitz-Thompson, lo que proporciona una estrategia muestral insesgada, ...
Artículo
A mathematical programming approach to SVM-based classification with label noise
(ScienceDirect, 2022-08-30)
In this paper we propose novel methodologies to optimally construct Support Vector Machine-based classifiers that take into account that label noise occur in the training sample. We propose different alternatives based on ...
Artículo
The tree based linear regression model for hierarchical categorical variables
(Elsevier, 2022-05-04)
Many real-life applications consider nominal categorical predictor variables that have a hierarchical structure, e.g. economic activity data in Official Statistics. In this paper, we focus on linear regression models built ...
Tesis Doctoral
Mixed Integer Nonlinear Optimization. Applications to Competitive Location and Supervised Classification
(2015-02-25)
This PhD dissertation focuses on the study of Mixed Integer Nonlinear Programming (MINLP) problems [34] for two important and current applications: competitive location on networks [59, 64] and Support Vector Machines ...
Artículo
Integer constraints for enhancing interpretability in linear regression
(Institut d´Estadística de Catalunya (Idescat), 2020-04-01)
One of the main challenges researchers face is to identify the most relevant features in a prediction model. As a consequence, many regularized methods seeking sparsity have flourished. Although sparse, their solutions ...
Artículo
Mixed integer linear programming for feature selection in support vector machine
(Elsevier, 2019)
This work focuses on support vector machine (SVM) with feature selection. A MILP formula- tion is proposed for the problem. The choice of suitable features to construct the separating hyperplanes has been modeled in this ...
Artículo
A Branch-Price-and-Cut Procedure for the Discrete Ordered Median Problem
(informs, 2020-01-07)
The discrete ordered median problem (DOMP) is formulated as a set-partitioning problem using an exponential number of variables. Each variable corresponds to a set of demand points allocated to the same facility with the ...