An ANN Is often a model based upon a group of related units or nodes called "synthetic neurons", which loosely model the neurons within a Organic brain. Each link, like the synapses in a very Organic brain, can transmit facts, a "signal", from one particular artificial neuron to a different. http://shop.ororo.co.kr/bbs/board.php?bo_table=free&wr_id=4740261