Ternary multiway switch by logic element utilizing third subharmonic oscillation (phasor based ternary logic) can be regarded as a complex-valued neural network. After showing various functions multiway switches can perform, including Fourier transform, by extending the original functionality as a memory address selector, its implementation by neuron-like element is considered as a model of natural neural networks by complex-valued artificial neural networks, and a search for pulse coded phasor signal in the real world is proposed.

Geographic-feature extraction methods based on a mesh data model, covering a wide range of features such as surface area, solid volume, slope features, and ridge valley features are proposed. These methods can be applied also for change analysis between multiterm models for a specific area. By analyzing two models measured in different time in the same area, some dynamic informations about the change during the period has been quantitatively and qualitatively obtained.>

Logical circuits using Esaki diodes, and which are based on a principle similar to parametron (subharmonic oscillator element) circuits, are described. Two diodes are used in series to form a basic element called a twin, and a binary digit is represented by the polarity of the potential induced at the middle point of the twin, which is controlled by the majority of input signals applied to the middle point. Unilateral transmission of information in circuits consisting of cascaded twins is achieved by dividing the twins into three groups and by energizing each group one after another in a cyclic manner. Experimental results with the clock frequency as high as 30 mc are reported. Also, a delay-line dynamic memory and a nondestructive memory in matrix form are discussed.