Fuzzy control has recently emerged as a new technique of knowledge-based intelligent control in which precise knowledge of control algorithms is not required. The control knowledge is expressed in terms of membership ...
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Fuzzy control has recently emerged as a new technique of knowledge-based intelligent control in which precise knowledge of control algorithms is not required. The control knowledge is expressed in terms of membership functions for control parameters and a given rule set which defines the relationship among various parameters. Although this technique is robust, it cannot learn and adapt as parameters change over time. Neural network control uses learning for defining mapping between input and output data. By using fuzzy logic rule/membership knowledge and neural network learning capability, this work proposes a new method for combining the two intelligent control methods. The proposed neuro-fuzzy method embeds fuzzy rule and membership knowledge into a neural network for training via a backpropagation algorithm. Results based on fuzzy control, the Iwata-Machida-Toda method, and this proposed method are given for cart-pole problems. The proposed method has the best response time and the smallest magnitude of oscillations near the setpoint.
A hybrid adaptive learning control for nonlinear dynamical systems is proposed. Feedforward multilayer neural networks are used to construct a controller. Parameters of the neural networks are adjusted by a dynamic ba...
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A hybrid adaptive learning control for nonlinear dynamical systems is proposed. Feedforward multilayer neural networks are used to construct a controller. Parameters of the neural networks are adjusted by a dynamic backpropagation algorithm and a genetic algorithm. The genetic algorithm manages to escape local minima and reach the neighborhood of the global minimum on the squared error surface. The dynamic backpropagation algorithm is used to search the global minimum from its neighborhood. Computer simulations show that the tracking control performance of nonlinear dynamical systems can be enhanced by the proposed method.
This paper attempts to perform text-to-phoneme conversion by using recurrent neural networks trained with the real time recurrent learning (RTRL) algorithm. As recurrent neural networks deal well with spatial temporal...
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This paper attempts to perform text-to-phoneme conversion by using recurrent neural networks trained with the real time recurrent learning (RTRL) algorithm. As recurrent neural networks deal well with spatial temporal problems, they are proposed to tackle the problem of converting English text streams into their corresponding phonetic transcriptions. We found that, due to the high computational complexity, the original RTRL algorithm takes a long time to finish the learning. We propose a fast RTRL algorithm (FRTRL), with a lower computational complexity, to shorten the time consumed in the learning process.
In this paper experimental conclusions are reported on the verification of a new learning procedure for training time delay neural networks (TDNN), based on the maximization of the cross-correlation between the output...
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In this paper experimental conclusions are reported on the verification of a new learning procedure for training time delay neural networks (TDNN), based on the maximization of the cross-correlation between the output of the network (pattern) and the target reference sequence. This functional has been used for training a TDNN encharged of estimating the aperture of the speaker's mouth from the acoustic analysis of his speech. Performances have been compared to those reported in a previous paper obtained with classical MSE-based back-propagation. Experimental results provide clear evidence of the improvements, both in terms of convergence speed and estimation fidelity, achievable through this new training algorithm.
The identification of a three-component distillation column was performed using a multilayered neural network trained with the backpropagation algorithm. To find an appropriate network size, several adjustment tests w...
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The identification of a three-component distillation column was performed using a multilayered neural network trained with the backpropagation algorithm. To find an appropriate network size, several adjustment tests were carried out during the experimentation. These tests included changing the number of hidden layers and number of the nodes in the hidden layer. Validation of the resulting neural model was made by comparison of network and process responses to inputs different from those used during training. The network adequately identified the system. Also, it was observed that the network is able to approximate the nonlinearities of the process with greater accuracy than an ARX model whose parameters were estimated using the classical least squares method.
A fuzzy inference network (FIN) is proposed. The proposed FIN preserves the advantages of both fuzzy classification algorithm and neural networks. It can learn membership functions directly from training samples and c...
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A fuzzy inference network (FIN) is proposed. The proposed FIN preserves the advantages of both fuzzy classification algorithm and neural networks. It can learn membership functions directly from training samples and classify patterns according to the membership values. As efficient self-organizing learning algorithm is also presented.
In this paper, we deal with the visualization of multivariate data by nonlinear projection methods performed by several multilayer neural networks. As the visualization is the first step in interactive pattern classif...
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In this paper, we deal with the visualization of multivariate data by nonlinear projection methods performed by several multilayer neural networks. As the visualization is the first step in interactive pattern classification, we provide the operator with a set of tools to manipulate the data. The results have been applied to a real biometrical example of the Guadeloupe honeybees races.
The concept of classification using principal features is presented. The principal features defined in this paper are analogous to principal components in statistics and linear algebra. Neural network training can be ...
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The concept of classification using principal features is presented. The principal features defined in this paper are analogous to principal components in statistics and linear algebra. Neural network training can be done by sequential identification of principal features and corresponding pruning of the training data. Two neural network simplification algorithms, lossless and lossy simplifications, make the the classifier design more efficient. The design procedure is compared with other classifier design algorithms.
This paper describes a recurrent neural network (RNN) based hourly load forecaster for hourly prediction of power system loads. The system is modular, consisting of 24 RNNs, one for each hour of the day. The RNNs cons...
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This paper describes a recurrent neural network (RNN) based hourly load forecaster for hourly prediction of power system loads. The system is modular, consisting of 24 RNNs, one for each hour of the day. The RNNs considered are sigmoid type neural networks with a single hidden layer. Two types of recurrency are considered: one has connections between the hidden layer nodes, and the other has feedback from output to hidden layer nodes. The hours of the day are divided into four categories and a different set of load and temperature input variables is defined for the RNNs of each category. The RNNs are trained with Pineda's recurrent backpropagation algorithm. To handle non-stationarities, an adaptive scheme is used to adjust the RNN weights during the online forecasting phase. The performance of the forecaster was evaluated on real data from two electric utilities with excellent results.
The multilayer perceptron (MLP) is successfully used in many nonlinear signal processing applications. The backpropagation learning algorithm is very useful for various problems. But the MLP obtains low generalization...
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The multilayer perceptron (MLP) is successfully used in many nonlinear signal processing applications. The backpropagation learning algorithm is very useful for various problems. But the MLP obtains low generalization ability if the number of hidden units is very large in training. In this paper, the authors show that if the MLP is trained with adding noise to hidden units, it obtains good generalization ability for any number of hidden units.
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