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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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AND<br />

x 1 x 2 x 3 x 4 x5<br />

OR<br />

w11 w 12 w 13<br />

w 21 w22 w 23<br />

OR<br />

AND<br />

Fig. 14.14: A typical pseudo-median filter.<br />

14.10 Self-Organizing Neural Net<br />

1/2<br />

1/2<br />

OR<br />

AND-OR<br />

Neuron<br />

Kohonen [9] proposed a new technique for mapping a given input pattern onto<br />

a 2-dimensional spatial organization of neurons. In fact, Kohonen considered a<br />

set of weights, connected between the positional elements of the input pattern<br />

<strong>and</strong> a given neuron, located at position (i, j) in a two dimensional plane. Let us<br />

call the weights’ vector for neuron Ni j to be<br />

w<br />

∼ ij<br />

. Thus for a set of (n × n)<br />

points on the 2-D plane, we would have n 2 such weight vectors, denoted by<br />

w<br />

∼ ij<br />

, 1≤ i, j≤ n. In Kohonen's model, the neuron with minimum distance<br />

between its weight vector<br />

w<br />

∼ ij<br />

using the following criterion [10].<br />

Find the (k, l) th neuron, where<br />

<strong>and</strong> the input vector<br />

X is first identified by<br />

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