A neural network simulator according to an embodiment of the present invention may comprise: a first neuron simulator including a first magnetic tunnel junction structure for outputting a first output stream in which a low level and a high level are mixed at a first ratio; and a synapse simulator which receives the first output stream and a second output stream in which a low level and a high level are mixed at a second ratio, and has electrical conductivity properties changing according to the difference between the first ratio and the second ratio.
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