A new method of forming silicon p$^{+}$-n-n$^{+}$ junctions has been attempted by using the VDH-Implanter (Vacuum Discharge and Heating). Each of p$^{+}$-n and n-n$^{+}$ junctions was formed on both sides of an n-type silicon substrate by means of predeposition of each dopant and their bombarding due to rarefied air ions together with the preheating of the substrate in the implanter. The recifying principle of the p$^{+}$-n-n$^{+}$ junctions is thought to be based on the theory of double injection. The I-V characteristic of the diode has shown that it has a fairly high forward current density with the desirable rise due to vary low voltage though the reverse voltage is a little low on account of the low resistivity of the silicon substrate.n substrate.

This paper deals with Linear Programming by Signal Flow Graph technique which is different from that of Mason and Coates. The objective function is regarded as variable, and slack variable node, artificial variable node and objective function variable (constant) node are newly defined, which shows the process for optimization of solution very intuitively. Also methods for solving L.P. and examples with subject to Ax.leq.b, Ax=b and Ax.geq.b are presented.

This paper treats with some of plasma jet behaviors under magnetic field for the purpose of controlling important characteristics of plasma jet in the practices of material manufacturings. Under the existence and non-existence of magnetic field, the pressure distribution, flame length, stability and noise of plasma jet are comparatively evaluated in respect of such parameters as are current, gap of electrode, quantity of argon flow, magnetic flux density, diameter and length of nozzle. The results are as follows: 1) the pressure, the length and the noise of plasma jet rise gradually with the increase of are current, and have high values under identical arc current as the diameter of nozzle increases, but reverse phenomenon tends to appear in the noise. 2) The pressure, the flame length and the noise increase with the increased quantity of argon flow, and the rising slope of noise is particularly steep. Under magnetic field, the quantity of argon flow in respect of flame length has the critical value of 80(cfh). 3) The pressure and length of flame decrease with small gradient value as the length of gap increases, but the noise tends to grow according to the increase of nozzle diameter. 4) The pressure and the length of jet flame decrease inversly with the increase of magnetic flux density, which have one critical value in the 100 amps of arc current and two values in 50 amps. The pressure of jet flame can be below atomospher pressure in strong magnetic field. 5) "The constriction length of nozzle has respectively the critical value of 6(mm) for pressure and 23(mm) for the length of flame. 6) Fluctuations in the wave form of voltage become greater with the increase of argon flow and magnetic flux density, but tends to decrease as arc current increases, having the frequency range of 3-8KHz. The wave form of noise changes almost in parallel with that of voltage and its changing value increases with argon flow, arc current and magnetic flux density, having the freuqency range of 6-8KHz. The fluctuation of jet presurre is reduced with the increase of argon flow and magnetic flux density and grows with arc current.rent.

3상 농형 유도전동기는 가장 경제적이고 편리한 동력원이다. 본 고에서는 유도전동기용 기동기에 대하여 여러가지 설계양식의 타당성과 장래의 개발가능성을 고찰한다. 기동기는 전동기를 기동시킬뿐만 아니라 정상상태하에서 정지시키는 장치이다. 또 기동기는 과부하에 의한 손상으로부터 전동기를 보호하고, 정전시의 우발적인 재기동을 방지한다. 기동기의 보호기능이 전기적으로는 중요하지만 이문제는 성가신 기동책무만큼 빈번히 발생하지는 않는다. 전동기용 기동기의 또하나의 기능은 회전방향의 전환 및 속도조정이다.

본고에서는 다음의 내용을 다루었다. 1. 새로운 기술시대와 전기학회의 사명 2. 현대전기공학의 영역 및 좌표설정