This paper reports on studies of queueing systems having finite waiting buffers and many processors with two input streams, one of which is given preference over the other by buffer reservation. The arrival patterns for the two streams are different. One stream is described by a renewal process and the other is Poissonian. The former is called a GI call, and the latter a Poisson call. The buffer reservation model in this paper is an analogy from a trunk reservation model for telephone network. Two models are considered, giving priority to either Poisson calls or GI calls. The buffer reservation models have some practical applications to packet switched network and integrated communication systems such as voice and data systems. The models are analyzed using piecewise Markov process theory and transient solutions for an M/M/S/K queueing model. In addition, some numerical results are shown for loss probability and mean waiting time, as well as throughput rate. Traffic characteristics are consequently clarified.

The reliability analysis of multi-state systems is needed for treating multi-modal failures, failure interdependency and degraded states. This paper defines some types of multi-state monotone systems from the positive relation between two states of components and presents their properties with emphasis on properties of Boolean structure functions with restricted 0-1 variables. Positive-directionally (or negative-directionally) monotone system is defined as the concept of monotone system wider than the former one, and its deterministic and probabilistic properties useful for the reliability analysis are given. Extended definitions of series, parallel and series-parallel systems are also given.

A CCD memory was implemented and its fundamental operation was confirmed. This memory is the first digital CCD field memory for video signal processing. It can read and write simultaneously at unusually high frequency such as 14.3 MHz in spite of having large capacity such as 195 k bits. This memory is made of one block of serial-parallel-serial structure. The ship size is 9.00 mm (H)5.5 mm (V). It was fabricated by n-channel CCD process using the three-level polysilicon technology. The thickness of gate oxide is 1000 . We developed CCD's of new structure for serial registers to obtain high horizontal bit density keeping high charge transfer efficiency. The serial registers have 768 effective bits and the length per bit is 10 µm/bit. The transfer efficiency was found to be more than 0.99997. Input clock pulses of the serial registers are 2-phase, 9 Vp-p. Parallel registers employ an operation of 6-phase electrode-per-bit, which contributes high vertical bit density. The clock generator and clock drivers for parallel registers are on-chip, and the levels of input clock pulses for them are TTL compatible. This memory generates reference signals, which identify digital signals of 1 or 0 at an external sense amplifier. The amplitude of the output signal is 200 m Vp-p.

This paper proposes, as a new LSI reliability estimation method, a procedure for estimating the failure rate of LSI by classifying failures according to failure modes and by expressing the failure rates as functions of the LSI design parameters. As a concrete example, bipolar logic LSIs and MOSRAMs were taken up. Their respective failure modes and the design parameter dependences for the failure rates were considered, in order to obtain the relations between the integration density and the failures. As a result, it was clarified that the failure rate per gate for bipolar logic LSI was inversely proportional to (the number of gates)^0.4 and that the failure rate per bit for MOSRAM was inversely proportional to (the number of bits)^0.7. And it was concluded that the dominant failure modes will be in the metallization for the bipolar logic LSI and in surface degradation for the MOSRAM. Thus, new LSI reliability estimation was carried out. And the technical problems to solve or new technical targets to study in order to improve the reliability of high density LSIs were clarified.

The static contact resistance between a lubricating composite material and three kinds of metals, copper, molybdenum and tungsten, were studied. The resistance for a pair of the composite and a metal under a load indicated a maximum or a minimum at a certain applied current. The behavior of the resistance vs. current curves could classify the contact pairs tested into three groups.

Field experiments have been performed in the Tokyo metropolitan area, using a 128 kbit/s GMSK signaling. Through the experiments, the diversity improvement on high-speed digital transmission performance have been made clear in land mobile radio channels.

A pitch of a grating drawn by an electron beam was controlled precisely within 10 by attaching an attenuator to a conventional electron-beam-exposure system. This technique may be applied for fabrication of a periodic structure for integrated optics.

A numerical approach for the solution of the scattering by the discontinuities in an elastic plate waveguide for SH waves is described. The approach is a combination of the boundary element method and the analytical method. The results by this approach for the step discontinuity in a plate waveguide agree well with earlier theoretical results.