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- Jesús González, Ignacio Rojas, Julio Ortega, Héctor Pomares, Francisco Javier Fernández, Antonio F. Díaz
- IEEE Trans. Neural Networks
- 2003

This paper presents a multiobjective evolutionary algorithm to optimize radial basis function neural networks (RBFNNs) in order to approach target functions from a set of input-output pairs. The procedure allows the application of heuristics to improve the solution of the problem at hand by including some new genetic operators in the evolutionary process.… (More)

- Jesús González, Ignacio Rojas, Julio Ortega, Alberto Prieto
- IEEE Trans. Neural Networks
- 2002

To date, clustering techniques have always been oriented to solve classification and pattern recognition problems. However, some authors have applied them unchanged to construct initial models for function approximators. Nevertheless, classification and function approximation problems present quite different objectives. Therefore it is necessary to design… (More)

A general problem in model selection is to obtain the right parameters that make a model t observed data. If the model selected is a Multilayer Perceptron (MLP) trained with Backpropagation (BP), it is necessary to nd appropriate initial weights and learning parameters. This paper proposes a method that combines Simulated Annealing (SimAnn) and BP to train… (More)

- José Luis Bernier, Antonio F. Díaz, +4 authors Julio Ortega
- Neural Processing Letters
- 2003

In previous work we have derived a magnitude termed the 'Mean Squared Sensit-ivity' (MSS) to predict the performance degradation of a MLP affected by perturbations in different parameters. The present Letter continues the same line of researching, applying a similar methodology to deal with RBF networks and to study the implications when they are affected… (More)

- Héctor Pomares, Ignacio Rojas, Jesús González, Fernando Rojas Ruiz, Miguel Damas, F. J. Fernández
- Int. J. Approx. Reasoning
- 2002

In this paper, a novel approach is presented to fine tune a direct fuzzy controller based on very limited information on the nonlinear plant to be controlled. Without any off-line pretraining, the algorithm achieves very high control performance through a two-stage algorithm. In the first stage, coarse tuning of the fuzzy rules (both rule consequents and… (More)

This paper presents a new approach to the pagination problem. This problem has traditionally been solved ooine for a variety of applications like the pagination of Yellow Pages or newspapers, but since these services have appeared in Internet, a new approach is needed to solve the problem in real time. This paper is concerned with the problem of paginating… (More)

- Ignacio Rojas, Jesús González, Antonio Cañas, Antonio F. Díaz, Fernando Rojas Ruiz, Manuel Rodríguez
- Int. J. Neural Syst.
- 2000

We propose a framework for constructing and training a radial basis function (RBF) neural network. The structure of the gaussian functions is modified using a pseudo-gaussian function (PG) in which two scaling parameters sigma are introduced, which eliminates the symmetry restriction and provides the neurons in the hidden layer with greater flexibility with… (More)

- Héctor Pomares, Ignacio Rojas, Julio Ortega, Jesús González, Alberto Prieto
- IEEE Trans. Systems, Man, and Cybernetics, Part B
- 2000

In this paper, a systematic design is proposed to determine fuzzy system structure and learning its parameters, from a set of given training examples. In particular, two fundamental problems concerning fuzzy system modeling are addressed: 1) fuzzy rule parameter optimization and 2) the identification of system structure (i.e., the number of membership… (More)

- Alberto Guillén, Ignacio Rojas, +4 authors Alberto Prieto
- IWANN
- 2005

Clustering algorithms have been applied in several disciplines successfully. One of those applications is the initialization of Radial Basis Functions (RBF) centers composing a Neural Network, designed to solve functional approximation problems. The Clustering for Function Approximation (CFA) algorithm was presented as a new clustering technique that… (More)

- Héctor Pomares, Ignacio Rojas, Jesús González, Alberto Prieto
- FUZZ-IEEE
- 2001

—The identification of a model is one of the key issues in the field of fuzzy system modeling and function approximation theory. There are numerous approaches to the issue of parameter optimization within a fixed fuzzy system structure but no reliable method to obtain the optimal topology of the fuzzy system from a set of input–output data. This paper… (More)