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金炯來 건국대학교부설 산업기술연구소 1977 논문집 Vol.3 No.-
In this paper, the 8-bit D/A Converter is designed and fabricated. D/A Converter which is most important in digital systems is consisted of a register, a Analog switch, a level amplifier, a ladder network and a Operational amplifier and these parts are mentioned too. In this experiment, resistor in ladder network is used within 0.05% to get a high accuracy. It is found that error of D/A Converter is less than 0.019% and it means a good agreement with a theory. It is expected that D/A Converters are many kinds used in all Digital systems and Analog system, so it needs more researches that D/A Converter can be to get a excellent accuracy and a fast conversion speed.
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폴리올레핀의 방사중 구조형성에 관한 연구 : PP 방사과정 시뮬레이션 Simulation of Melt Spinning Process of Polypropylene
尹文求 건국대학교부설 산업기술연구소 1987 논문집 Vol.12 No.-
In this paper, high speed spinning of polypropylene was simulated. Changes of diameter, temperature, stress, birefrigence and relative crystallinity along the spinning line were calculated utilizing experimental data and some assumptions. In expressing relative crystallinity, Avrami equation was modified as the cryatallization rate constant is function of birefringence and temperature, and set Avrami exponent n=1, spinning speed, and the relative crystalinity became to unity in the course of spinning when the speed exceeded about 5000m/min.
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金炯來 건국대학교부설 산업기술연구소 1978 논문집 Vol.4 No.-
Recently the digital electronic engineering is effected on all fields of the engineering and it is a current tendency that the electronic devices are digitaling. In the paper, Ternary logic theory, a important base of digital electronic engineering, is threated and Ternary logic adder are designed and arranged. Adder circuits which are composed of one NOT gate, DOUBLE NOT gate and a Gate Sellector circuit are analyzed theoretically. It is observed that the circuit, designed have a good operational stability and are simplified in circuit configuration, for the half and the full adder.
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李濬 건국대학교부설 산업기술연구소 1978 논문집 Vol.4 No.-
Effects of electrokinetic potential of mineral fillers in the formed sheets were studied not only by determining zeta potential of the fillers in various wet and conditions but also by comparing retention of the fillers and turbidity of the white water along with the change of zeta potential. Zeta potential change of a filler with change of alum concentration in distilled water was quite different from those of the other fillers, probably because their intrinsic mineralogical properties are different. However, zeta potential change of a filler with change of alum concentration in rosin size solution was nearly same to those of the other fillers, probably because the rosin-aluminum size precipitates, being formed in the first stage, adsorbed to the surface of each filler particle in same manner. As being able to be expected with the zeta potential change of fillers in rosin size solution, the retention of the fillers in the formed sheets was maximized and turbidity of the white water was minimized around zero zeta potential.
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Some Mixed Boundary Value Problems for Regions with Oblate Spheroidal Boundaries
Lee,Doo-Sung 건국대학교부설 산업기술연구소 1980 논문집 Vol.5 No.-
近年에 이르러 경계치가 혼합경계조건으로 주어진 문제들이 많은 관심의 대상이 되었고 그중에서 대부분이 원통좌표계의 축대층문제 또는 二次元平面問題들로서 oblate spheroidal 좌표계의 문제를 취급한 것은 없다. 이 논문에서는 탄성학에서 일어나는 oblate spheroidal 좌표계의 혼합경계치 문제를 다루었다. 두 문제의 해를 구하였는데 첫째는 外部크랙과 동전 모양의 크랙을 가진 무한탄성체내의 응력분포를 고찰한 문제로 혼합경계치조건으로부터 3雙의 方程式을 얻었다. 이 3雙 方程式은 종래의 방법에 의해 원통좌표제로서 3雙 積分方程式의 해를 구하는 방법으로도 해결할 수 있겠으나 closed form solution을 얻을 수 없는 반면 現在의 방법으로는 이것이 가능하다. 둘째는 oblate spheroid 의 응력분포에 관한 고찰을 하였다.
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冷間壓廷鋼板의 Cyclic Tension에 依한 强度增加에 관한 硏究
孫世元 건국대학교부설 산업기술연구소 1984 논문집 Vol.9 No.-
In this paper, author report that a cold rolled steel plate when applied cyclic tension shows various mechanical properties as follows (1) It was noticed that under the identical treatment the hardness of specimen B was greater than that of specimen A, and the hardness of the specimens showed no sign of changes after 25 days. (2) Residual strain was observed even under the cyclic load which varied from 70% to 90% of the yield point load according to various conditions. (3) If certain period of time passes, after applying cyclic load greater than the yield point-load, upper and lower yield point of the specimen are increased. (4) Yield points of specimen A and B have increased both, particularly the increment of specimen B is much greater than that of specimen A, however the ultimate tensile strength is little affected by the cyclic load.
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金暎權 건국대학교부설 산업기술연구소 1978 논문집 Vol.4 No.-
The Performance of travelling wave type Laser modulators is Analysis are mode of the characteristics of there modulators in both the time and frequency domains. There analysis are used in design of a 2GHz modulator for high speed optical modulation. It is shown that even at there high bandwidth it is not necessary to resort to velocity Compensation of the electrical and light signals.
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李鐘岳 건국대학교부설 산업기술연구소 1978 논문집 Vol.4 No.-
The analysis is based on the variational method and equivalent network theory. The results calculated show that the mean slow wave factor is 10 and the slow factors at the upper and lower 5% of pass band are 50.
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尹文求,張瑛燾 건국대학교부설 산업기술연구소 1980 논문집 Vol.5 No.-
Some characteristics of the isotactic polypropylene that contain 0.2%∼0.6% trilauryl trithiophosphite(TLTTP) and subjected to heat treatment above melting point under nitrogen atmosphere have been investigated. After melt processing, there were considerable decrease of molecular weight of the polymer when compared with that of without TLTTP. IR test of the sample showed that there was no evidence of any chemical combination with TLTTP. It was observed that TLTTP promoted depolymerisation of polypropylene when melted above the temperature of 240∼260℃. Although there were some increase of extractable low molecular weight fraction after melt processing, depolymerisation occured mainly on the main chain of the polypropylene and the structure of the polymer has not changed.
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金炯來,朴慶淳 건국대학교부설 산업기술연구소 1980 논문집 Vol.6 No.-
High-Fidelity demodulation of FM signals requires a wide frequency range with low distortion, and sufficient protection form interference. The sharp frequency selectivity of the tracking filter separates the desired FM signal from interference, and the feed-back nature improves the detecting. A Linearity ensuring High-Fidelity can be reproduced in P.T.L. A P.T.L. consints of Tracking Filter, Hilbert, Filter, Loop Filter, Phase Comperator and OP Amp. In this paper, the circuit of P.T.L. FM detector is designed and is applied for an FM receiver. As a result, it is evident that P.T.L. is possessed of improved threshold level by 20dB, which proves the superior reception in fringe areas.
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