All of the characteristics of the batwing rediator, which is the heart of the superturnstile antenna system, are theoretically calculated by using the Moment Method. The original type, based on this antenna, and the modified batwing antennas, types I, II and III in total of four were examined. The modified batwing antenna type I is used as a horizontally polarized wave antenna among the circularly polarized wave antennas developed by RCA in the U.S.A. as a countermeasure for the ghost phenomena, while type II is used as an antenna having wide band characteristics for IFF receiving. Type III is a combination of types I and II. The characteristics of the above stated four types of antennas are analyzed theoretically by the use of the Moment Method and the results are compared through the use of measurement. Furthermore, the matching condition is obtained on the basis of the characteristics in the cases of changing the shape of the jumper and of changing the distance between the support mast and the antenna elements.

This paper reports on the overflow process for a trunk reservation system which has two kinds of Poisson inputs. The Laplace-Stieltjes transforms of the interoverflow distributions for each of priority calls and ordinary calls are derived, respectively. The overflow process for priority calls is renewal. The Laplace-Stieltjes transform of the interoverflow distribution for priority calls is represented by the recurrences, and the variance of overflow traffic can be easily obtained by the theory of GI/M/ model. The overflow process for ordinary calls is semi-Markovian, since it depends on the number of busy trunks. The Laplace-Stieltjes transform for the semi-Markovian kernel, depending on the number of busy trunks, is derived. The variance can be obtained by the theory of semi-Markovian inputs model, SM/M/. The total overflow process for both priority and ordinary calls is also derived, but in this case the semi-Markovian kernel is more complicated than that for the overflow process for ordinary calls. The variance of the total overflow traffic being analyzed, the covariance for the two kinds of overflow traffic can be easily obtained. Moreover, some numerical results are shown and characteristics of the overflow traffic are discussed.

Realizability criteria for infinite dimensional time-varying linear dynamical systems are studied. We set up the problem of realization and obtain some necessary and sufficient conditions for given matrix weighting patterns to be realized by the above mentioned systems in which state spaces are Banach spaces or Hilbert spaces. Moreover, we show that the problem of realization in infinite dimensional systems is not trivial, that is, there are realizable weighting patterns which are not realized by finite dimensional time-varying systems. The theory of evalution operators in Banach spaces plays an important role in our study.

This paper considers a multi-base single repair station problem which is a reliability analysis for a system with a large number of equipments operated in their own bases and some repairmen in the repair station. In this problem, all the failed equipments are repaired in the repair station and are sent back to their own bases after completions of repair. The mean and the variance of the number of operative equipments in each base are obtained by a diffusion approximation method. Numerical examples of an approximation solution and a simulation solution are presented.

A mathematically rigorous treatment of the electromagnetic scattering problem of dielectric cylinders based upon the finite element method is presented. The problem is formulated in the variational terms in two different forms depending upon the matching condition at the artificial boundary.

This paper deals with two optimal preventive maintenance policies, i.e., Policy I and Policy II proposed by R. Barlow and L. Hunter, and in particular emphasizes on the characteristics of the optimal maintenance theories due to numerical analysis. Through this paper, the Weibull model is adopted as a failure modes and its shape parameter β plays an important role. According to the results newly obtained, we discuss the characteristics of the two types of policies and their advantages and disadvantages. Next, the new results are applied to the field data of failure and maintenance in order to investigate the actural maintenance techniques.

If there is high uncertainty in the reliability of a system, it is required to know for which components to collect further failure data for making the uncertainty lower. This paper provides some solutions for such a requirement. First, the variance importance of a component is defined as a measure of component's contribution to the variance of the distribution of system unreliability. For reducing the system-variance efficiently, it would be suitable to collect failure data of comopnents having greater values of variance importance. Next, in the situation that we will perform life tests of components for making the variance of the distribution of system failure-rate smaller than its prior value, some problems for determinig both the number of samples to be tested and the test time for each component are formulated and solved.

In this short note, an upper limit of modulation enhancement of electronic phase shifter employing a multilayer dielectric-waveguide structure is provided by the application of general theory of dielectric waveguides.

The composite dielectric waveguides with multi-boundaries in radial directions have axially unsymmetrical structures. To have the large difference in propagation constant for the two orthogonal HE11 modes, the waveguides have attracted our attention as a new type of single-polarization optical fibers. In this paper, the modal characteristics of the composite dielectric waveguides are investigated by a numerical analysis based on the point-matching method. The dispersion characteristics for millimetric dielectric waveguides with large difference in dielectric constant as well as single polarization optical fibers with small difference in refractive index are shown. Also, the patterns of electric field distributions for propagating modes are illustrated. The propagation constants are obtained with three significant figures for both the dominant and higher order modes. Microwave model experiments using a composite dielectric waveguide made of Rexolite and Teflon were carried out to confirm the theory.

A color subcarrier in a television (TV) signal via a broadcasting satellite is expected to be an effective medium for future frequency dissemination. The difficulty inherent in use of the broadcasting satellite is the Doppler shift due to the drift around the geostationary orbit. Therefore, it is important to measure the Doppler frequency shift of the color subcarrier precisely and to establish a technique which cancels out the effect. The Doppler frequency shift measurements were carried out by using a Medium-Scale Broadcasting Satellite for Experimental Purposes (Yuri). This paper reports the results observed at Sapporo. The important results are as follows. The Doppler shift amounts to about 1108 in the worst case. However, when the transmitted frequency is controlled at the Kashima transmitting station, the Doppler shift may be canceled out to within a few parts in 1010 at Sapporo. Furthermore, it is expected that we may usually obtain the standard frequency with an accuracy of the order of 1012 if the Doppler shift compensation is employed at both transmitting and receiving points. These results are important when we construct a nationwide frequency dissemination system using a broadcasting satellite.

Spectrum efficiency of M-ary PSK land mobile radio is discussed theoretically, where the efficiency ηT (erl/Hz-m2) is defined as the spatial traffic density per system bandwidth. Effective techniques to increase ηT are reviewed. Effects of multi-level modulation, diversity reception, forward error correction (FEC) and detection scheme upon ηT are clarified. It is shown that the combination of quadri-phase-shift-keying with coherent detection (QCPSK) and the FEC at a certain coding rate makes ηT maximum. For the optimum system, ηT and the system capacity are evaluated under a practical condition.

This paper describes charging and deflection characteristics of a binary multi-nozzle ink jet printer. In a binary printer, ink drops are selectively deflected by applying a charge to them, while uncharged drops proceed in a straight line to form the part of characters. The printer used in our experiment has eight nozzles, 55µm in diameter and on 0.5 mm centers. Charging electrode slot width is 0.3 mm. Drop frequency is 40 kHz. Drop frequency is divided into printing frequency by 16 so that a moderate printing speed is obtained. The charge electrode array is positioned with respect to a nozzle array so that the drop formation occurs within a certain region inside the charge electrode slots. Then no crosstalk between the adjoining electrodes has been observed and the induced charge by the previously charged drop can be neglected. The deflection condithion, for defect-free prints, is such that the charged drops are collected into a catcher whereas the charged drops do not merge with the uncharged drops. The charging voltage and the separation between the undeflected ink streams and the deflection plated are important parameters. Experimentally a sufficient amount of deflection has been obtained by the image force of the charged drops without the use of a high deflection voltage.

The effects of multiple scattering between two cylinders which have different radii are explicitly evaluated by direct matrix inversion techniques. This letter gives not only the field calculated around two cylinders but also good agreement between theory and experiment.

A fast identifying method of animation line drawings composed of some ten closed regions is described by the use of spatial location and adjacent relation among closed regions contained in successive two frames of the line drawings. The method consists of global and local matching. The global matching identifies closed regions which change slightly in size and shape as a set of three closed regions in each of successive two frames by the use of a relaxation method. In the local matching, closed regions identified in the global matching are taken as seeds around which new interpritations may grow, and unidentified closed regions which are adjacent to the seeds and have similar location relation are identified by taking vectors drawn between centroids of closed regions as parameters. The mechod is applied to a series of sixteen line drawings, and all the closed regions contained in the line drawings are correctly identified excepting closed regions newly appeared in successive two frames.

In this paper we present a new relationship between two differently derived FIR low-pass differentiation algorithms: The time-domain based Lanczos algorithm, and the frequency domain Minimum Mean Square Error(MMSE) algorithm. We then discuss the theoretical significance and the practical results of this relationship.

Refractive-index dispersion mesuarements were performed using the minimum deviation method for bulk specimens at wavelengths from 0.4047 to 2.0581µm. The data were utilized to calculate an optimum index profile,αop, and zero-material-dispersion wavelength,λ0, for the optical fiber. For GeO2-SiO2 glass core fibers,αop values are 1.93 at 1.30µm, and 1.88 at 1.55µm. There are independent of GeO2 concentration. The wavelength λ0 shifts from 1.272 to 1.376µm, proportionally to the GeO2 concentration from 0-19.3 mol%. The data also show that the addition of P2O5 slightly increases material dispersion, and the value of αop for the P2O5-SiO2 core glass decreases monotonically from 2.16 at 0.4 µm to 1.91 at 2.0µm.

The noise properties of directly modulated laser diode influenced by reflected waves are given theoretically. Firstly, the quantum noise enhancement effect due to direct modulation is found theoretically in term of product between the quantum shot noise and the modulation current. Secondly, the high-frequency intensity noise due to reflected waves (often so-called self-coupling effect) is clarified to be due to resonance of the quantum shot noise to the external cavity. According to our theory, it is found that the noise of the narrow stripe laser diode with the stripe width comparable to the diffusion length of carrier is about 10 dB smaller than that of the wide stripe laser. And also, the reverse isolation loss of an optical isolator is estimated theoretically to be 30 dB to reduce the relative high-frequency intensity noise by 40 dB.

A store and fordward speech interpolation telephonic concentrator system is introduced. This paper presents first the system, describes its main parts and components and using typical parameters the probable system operation is outlined. Following, a study on capacity and delay of transmission of each voice packet is done by supposing that a M/D/1 model can be applied to the system. As voice has special characteristics and packets don't arrive randomly as supposed in the M/D/1 model, an analysis using a computer simulation is done. The source generating speech is closely matched with human voice by using a model with good resolution specially for small pauses of talkers during the active generation of speech. Using this source, simulations representing 120 or 180 sec. of actual time are done. As its results are different of those predicted by the M/D/1 model, the capacity of the system is forecasted again through examples. To increase even more the capacity without impairing the frozen out fraction of the speech or increasing the delay of each packed, a different method to decrease congestion in those short moments of high arrival rate of packets is intended. This method consist in to transmit from each voice sample only 7 bits during the high congestion moments, creating new capacity by shortening packets. Results of parameters obtained by simulation and probable capacity of the system are again shown.

A necessary condition is given for a closed set of k-valued logical functions to be essentially minimal. It is stated in terms of the associated 1-variable function of a generator of the set concerned.

A unified approach to the derivation of canonical single amplifier circuits capable of realizing second-order filters with finite transmission zeros is proposed. Application of the proposed approach leads to the known circuits, as well as some new ones. Design formulae for the new circuits are presented, and their salient features are pointed out. Finally, design examples are also presented.