(Sharma et al., 2007).
Artificial neural networks are based on the neural structure of the human brain, which processes information by means of interaction among many neurons. In the past few years there has been a constantincrease in interest in neural network modelling in various fields of material science (Taskin et al., 2008). These networks consist of many simple units working in parallel with no central control, and learning takes place by modifying the weights between connections. The basic components of an ANN are neurons, weights and learning rules (Stich et al., 2000).