A novel piezoelectric electro-motional device using a PVF₂ multilayer bimorph structure is described. This structure delivers a relatively large bending motion at low applied voltages because of the bimorph action and the thickness of the polymer films. Typically, the bending deflection at the unsupported end of a two-layer bimorph cantilever structure 20 mm in length is 1 mm per 10 volts of dc applied potential across the layers. Frequency response is typically 10 - 10² Hz depending upon cantilever length. Performance is relatively insensitive to temperature over the range 35 to 40. A large range of mechanical-electrical tradeoffs in relatively simple structures using inexpensive material makes these devices potentially attractive for a wide range of applications that require low frequencies and mechanical force, for example: for fine motion control, for displays, for light beam control, and for certain types of electrical circuit control.

Design theory for piezoelectric polymer membrane motional devices is presented. Three types of structures are considered: 1) multilayer structures with a central non-piezoelectric layer, 2) multilayer structures using layers with various thickness in which the electric field is expressed by a approximation of linear spatial dependence, and 3) single layer structures with interdigitated electrodes. The first and second structures feature a reduction in the number of layers with little reduction in motional performance. These approaches are advantageous for structural simplification. The third structure provides a 35 times larger bending displacement than that of the original double layer bimorph using the same layer thickness.

Transient numerical analysis of electrical signal injection into the surface CCD is given regarding the potential equilibration method. The analysis is composed of the charging and discharging processes of signal charges, characterized by time intervals T_C and T_D of the respective input pulses. A concept of setting time T_S" explains how the mode of injection converts from the potential equilibration to dynamic injection, and determines a optimum T_C . A concept of residual effect of excess charges" is discussed in relation to sampling effect. The procedure to determine a optimum T_D is also proposed. It is concluded that the optimum T_C and T_D for completion of linear charge preset are determined by device geometry (that is, electrode lengths of the CCD input gates), while the T_C also depends on the bias condition of the input pulses. The above conclusions can be applied to setting input pulses and the structure of CCD inputs designed for analog signal processing.

The efficient use of frequency spectrum is one of the most important problems in mobile radio communication systems. In a small zone system (the so-called cellular system), the algorithm used to make the channel assignment for a call has a great effect on system performance (traffic characteristics). This paper presents the relationships between the traffic-carrying capacity and the graph which represents the relation among a zone and its buffer zones in the system. Furthermore, using these relationships, an algorithm for the dynamic frequency (channel) assignment which has all channel available at all base stations is proposed. The performance characteristics of this algorithm obtained from computer simulations are also presented. The computer simulation treats the two examples (systems), one is the system in which the mobile units does not cross a zone boundary during a communication (the zone size is sufficiently large and the probability of the occurrence can be neglected.), the other is the system in which the mobile unit may cross a zone boundary during a communication. The results from these simulations show that the algorithm carries more traffic per channel at a given blocking rate than the RING method.

A new quick response rain gauge of waterdrop counting type with a wide measurement range from 0.7 up to 300 mm/H has been developed. From the result of the filed operation for 3 years, this gauge is proven to have the accuracy better than 10%.

A voltage-controlled current source, one of the controlled sources, has been used primarily for realizing the gyrators. This paper proposes a method of realizing an active RC filter using directly VCCS's as the active element. Also, this paper presents various circuits capable of obtaining the low-pass, band-pass, high-pass, and all-pass functions as typical applications.

Optimal channel graphs (least blocking probability), so far confined to those derived by parallel operations", are generalized for a simple 4-stage case. An optimum is materialized, and is assured to be superior to the former optimum.