본고의 내용은 다음과 같다. 1. 기계공업과 전자공업의 발전 2. 중화학공업과 경제발전 3. 전기공업진흥법 제정의 필요성

본고에서는 전력송배전계통에 사용되고 있는 변압기와 피뢰기용소재로서, 무부하운전시 또는 부하동작시에 발생되는 불가피한 소비전력을 절감시키기 위한 새로운 전기재료의 기술개발 내용을 소개하고자 한다.

산업용 열병합발전은 연료경제성면에서 충분히 경쟁력이 있는 것으로 인정되고 있으나, 모든 환경에서 경제성이 보장되는 것으로 생각할 수는 없다. 따라서 다음의 여건을 충분히 감안, 전문적인 검토를 받고 실시하는 것이 바람직하다. 첫째, 산업용 열병합발전기의 추진에는 부하특성을 면밀히 검토하고 한전의 수전단가를 고려한 최적용량이 결정되어야 한다. 둘째, 석탄, 석유, 가스 등 연료면에서 다양한 검토를 실시하고 자체공장의 여건에 맞는, 경제성이 있는 연료의 선택이 중요하다. 셋째, 정부에서 열병합발전을 하는 업체에 주는 세제, 금융상의 혜택을 최대한으로 이용할 수 있도록 계획하여야 한다.

본고의 내용은 다음과 같다. 1. 설비현황과 전망 2. 발전원의 다원화와 탈석유전원 개발 3. 발전 열효율의 현황 4. 설비운전기술의 향상 5. 설비관리의 개선과 보완

발전효율은 증기발생용 수질 보일러의 구조 및 재질 등 여러가지가 있겠으나 그중 연료의 연소효율이 가장 중요하여 이것과 관련한 성상 및 연료현상에 대하여 기술하고 또한 국내에서는 이를 성능시험에 대한 제도적 장치 및 기법이 확립되어 있지 않아 성능 기준의 판정이 곤란한 실정이므로 측정 방법도 간단히 부연하였다.

The effects on the characteristics of 20-W fluorescent lamp were studied when applying magnetic field to its positive column. First, when the direction of the magnetic field is axial, i.e., along the lamp, if the magnitude of the field is stronger than the critical field, lamp voltage is increased, lamp current decreased, luminous flux increased, starting voltage decreased, as increasing the applied magnetic field. At the magnetic flux density is 130 gauss, luminous flux is increased to about 6 percents and starting voltage is increased to about 45 percents. Second, when the direction of the magnetic field is transverse to the lamp axis, as increasing the applied magnetic field, lamp voltage is increased, lamp current decreased, luminous flux increased and starting voltage is nearly constant, but the rates of increase or decrease of this case is different from those of the first. At the magnetic flux density is 300 gauss, luminous flux is increased about 45 percents. In both cases, electric power dissipated by lamps is the same as that of the lamp which magnetic field is not applied to.

The objective of this paper is to present a digital method for improving the lateral resolution of the B-scan images in the medical applications of ultrasound. The method is based upon a mathematical model of the lateral blurring caused by the finite beam width of the transducers. This model provides a simple method of applying a recursive scheme for image restoration with fast computation time. The point spread function (P.S.F.) can be measured by the reflective signals after scanning the small pins located along the depth of interest. From the measured P.S.F., one can compute the coefficient matrices of the inverse discrete-time dynamic state variable equation of the blurring process. Then, a recursive scheme for deblurring is applied to the recorded B-scan to improve the lateral resolution. One major advantage of the present recursive scheme over the transform method is in its applicability for the space-variant imaging, such as in the case of the rotational movement of transducer.

This paper considers a finite spectrum assignment Problem for a functional retarded linear differential system with delays in control only. In this problem, by generalizing from an abstract linear system characterized by Semigroups on a Hilbert space to a finite dimensional linear system, we unify the relationship between a control-delayed system and its non-delayed system, and then by using the spectrum of the generator-decomposition of Semigroup, we try to get a feedback law which yields a finite spectrum of the closed-loop system, located at an arbitrarily preassigned sets of n points in the complex plane. The comparative examinations between the standard spectrum assignment method and the method of spectral projection for the feedback law which consists of proportional and finite interval terms over present and past values of control variables are also considered. The analysis is carry down to the elementary spectral projection level because, in spite of all the research efforts, so far there has been no significant attempt to obtain the feedback implementation directly from the abstract representation forms in the case of multivariables.

Metal-Oxide-Metal thin film diodes have been fabricated on the glass substrates by conventional vacuum evaporation method, and the electrical properties, primarily current-voltage characteristics of diodes, have been discussed in the light of various conduction theories presented so far. The experimental results were ploted in the different figures according to the assumed theory, and the characteristic coefficients peculior to these theories were estimated from the function dependence of current (I) upon voltage (V), temperature (T) and oxide film thickness (d).

DC choppers are usually used to control the DC motor by varying the average value of DC input voltage to the DC motors. In this paper, a chopper circuit is suggested and reconstructed by replacing the free-wheeling diode with the parallel capacitor in the conventional ones. It is demonstrated that this chopper circuit with capacitor can reduce the ripples of the output voltage and current in contrast to those of the chopper with diode, and it can be controlled the output waveforms smoothly at high power demand.