In this letter, an economical VLSI switch MWS is proposed. MWS is constructed using a large amount of normal speed RAM and provdies sufficient switching capacity without high speed devices or technology.

A simple power spectral calculation formula for a digitally modulated carrier signal is derived by modifying the method for a baseband signal previously proposed by Yasuda and Inose. Some computed examples based on the proposed formula are presented to show its effectiveness.

GaInAs/InP MOSFETs were fabricated by organometallic vapor phase epitaxy (OMVPE) for the first time to obtain an effective channel mobility of 900 cm²/Vs comparable to the best data by other growth techniques. For the MOS structure, a native oxide layer was formed by low-temperature (220) oxidation technique using water. Due to potentially high uniformity, OMVPE MOSFET technique could be very attractive in the optoelectronic integrated circuits(OEIC) for optical communication.

Natural quartz jacketed fibers showed a larger OH loss increase due to diffused H₂ than synthesized silica jecketed fibers. This additional OH loss increased with an increase in the drawing temperature and a decrease in the drawing speed in the former, although it was not changed by the drawing conditions in the latter. From this result, it was estimated that impurities which diffused from the natural quartz into the core glass during the drawing process were related to the large OH loss increase.

A method for the synthesis of near optimal NAND networks is presented. At first, a given logical function is realized as a multilevel network with a minimum number of negative gates. Next this is transformed into a NAND network. Since procedures presented here do not require backtracking, they are quite efficient.

The construction method for ladder filters employing piezoelectric ceramic resonators, widely used in consumer radio communication equipments, is investigated with the object of obtaining low-cost high-performance filters. For the presented method, the resonant or antiresonant frequencies of the resonators included in a filter are staggered one after another, perceiving that a small difference in these frequencies between electrically adjacent resonators can be tolerated. The allowable frequency limits for this filter are about four times as great as those for a usual filter, designed using the image parameter or near-image parameter method. The filter can exhibit performances equal to the usual filter. The frequency adjustment process for resonators is able to be fairly well curtailed. Filters based on this construction method include ceramic filters for CB transceiver and pocket-bell receiver, which were designed and trially produced. As a result, low-ripple filters with rough frequency adjustment at most were obtained.

Application of the one-bit correlation method is shown to be effective to spectral estimation of the very low frequency (VLF) waves observed in the earth's magnetosphere, whose wave forms were recorded with a conventional multi-bit data acquisition system. These natural radio noises are confirmed to be stationary and to have Gaussian amplitude-probability distribution. A few examples of comparisons are presented to demonstrate validity of the one-bit correlation method between spectra obtained by one-bit and multi-bit correlation procedures. Advantages of one-bit method over multi-bit method are briefly discussed.

A new switching gate called a kinetic momentum quantum transition device is proposed. The device is composed of two SQUIDs; one is a guantum flux generator and the other is a flux detector. The two SQUIDs are magnetically coupled with each other. The principle of operation is based on the quantized effective flux generated by the SQUID with a small inductance (LI₀φ₀) and detected by the other SQUID. The device operations were demonstrated experimentally using the fabricated coupled SQUIDs having lead-alloy Josephson junctions. The experimental results were analysed quantitatively using the proposed model for devices. The input-output chracteristics of the device showed step-function-like nonlinearity resulting in a very high current gain. The input and output are well separated from each other. Because of the small necessary inductances, the device-size is one tenth smaller than usual SQUID gates.

Consider the following open problems:
(1) DL=? NL;
(2) DL=? P;
(3) NL=? P;
(4) DCSL=? CSL.
Here DL = DSpace(log n), NL = NSpace(log n), DCSL = DSpace(n), and CSL = NSpace(n). We study a restriction R on both deterministic and nondeterministic oracle machines that operate within log n space such that DL=NL if and only if for every oracle set A, DL_R(A)=NL_R(A), and similary for the other problems.