title: Optical implementation of the Hopfield model for two-dimensional associative memory.
abstract: Optical implementation of Hopfield's neural network model [Proc. Natl. Acad. Sci. USA 79, 2554 (1982)] for two-dimensional associative memory is discussed. Two-state neuron elements are represented by a twisted nematic liquid-crystal optical switch array, and three-dimensional holographic interconnections are realized with these elements. Unipolar connections, created by adding a constant to bipolar interconnections and compensating them with an input-dependent thresholding operation, are realized. The 16- (4 x 4) neuron system model acts as a content-addressable associative memory with error-correction capability.
authors.forename: J S
authors.initials: JS
authors.lastname: Jang
authors.forename: S W
authors.initials: SW
authors.lastname: Jung
authors.forename: S Y
authors.initials: SY
authors.lastname: Lee
authors.forename: S Y
authors.initials: SY
authors.lastname: Shin