Mitsubishi Denki Kabushiki Kaisha

Shigetoshi Nara

Takashi Iwamoto

Yuji Abe

Satoru Isoda

Yasunori Tokuda

Satoshi Ueyama

Toshinao Ishii

Hiroaki Kawakubo

Akemi Ogura

Wolfgang Banzhaf

A light transmission circuit 20 is biased to one optical bistable region of its multistable characteristic by a bias light from a light source 29. The bias light is superimposed by plural control pulse lights, and the superimposed light is irradiated. If the light intensity of the bias light exceeds a predetermined turning point according to the light intensity of the control pulse light, the state of multiple quantum well layers 4 and 24 are changed. Then, the light transmission state of the light transmission circuit 20 changes. Hereby, after the control pulse light disappeared, the bias light is detected by a light-receiving device 30 in a different transmission state from the prior state. And, the transmission state returns to the original state by selecting suitable light intensities of the control pulse lights to be superimposed. Therefore the light transmission circuit 20 can be switched reversibly.

Optical switching apparatus

An information retrieval system retrieves stored information on the basis of incomplete or noisy retrieval key information within a realistic processing time. The information to be recalled is stored in neural network associative memory. Genetic algorithms are adopted to avoid a thorough retrieval of data in a huge breadth and depth of high-order space which must otherwise be searched due to ambiguity of retrieval key information. The information containing the given retrieval key is effectively sought. A processor employs a neural network. A memory is correctly recalled from partial inputs or inputs in which noise is extremely pronounced by repeating a sum-of-product operation of a firing pattern within a synapse coupling matrix and also threshold value processing.

Information retrieval system

Layers constituting a rectifier or transistor element are respectively formed by oxidation-reduction substances so that a redox potential difference is provided between adjacent layers. The oxidation-reduction substances are selected from biogenic redox protein, pseudo-redox protein and the like. The element is implemented in hyperfine size in molecular level, so that an integrated circuit of super-high density can be attained by using the element.

Electric element using oxidation-reduction substances

Growing community of inventors

Hyogo, Japan

Shigetoshi Nara