“…Artificial neural networks (ANNs) are dynamic and self-adapting systems, which closely resemble the process of human learning and have been widely utilized to handle nonlinear data processing from electronic nose systems (Llobet et al, 2004;Parpinello et al, 2007). Back propagation neural network (BPNN), support vector machines (SVM), adaptive logic network (ALN), radial basis function network (RBFN), fuzzy ARTMAP, self organizing map (SOM) network and time-delay neural network are some of the ANN architectures that have been applied to process electronic nose data (Qu et al, 2001;Dutta et al, 2002Dutta et al, , 2006Zhang et al, 2003;Brudzewski et al, 2004;Llobet et al, 2004;Yu et al, 2008). Selection of the appropriate neural network architecture involves a variety of factors including sample size, number of inputs, number of out puts, hidden layers, training method (supervised or unsupervised) and purpose of the network (classification or prediction) with the overall goal to find an appropriate input-output relation that minimizes the prediction error (Yang et al, 1998;Agatonovic-Kustrin and Beresford, 2000).…”