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陸鍾一 건국대학교 1979 論文集 Vol.10 No.1
In this experiment E-glass fiber was used as a specimen material to transfer higher SiO2 content and promote physical properties by acid teaching. The change of SiO2 content and melting point of the fiber were plotted with variable condition such as acid concentration, leaching time and temperature. The results obtained by-the study are as follows. 1) E-glass fiber was the best material for high glass forming, and on acid treatment, 4 NHCI was most suitable. 2) The temperature condition could vary the SiO2 content of the fiber, but it was befit to keep the temperature between 95℃ and 100℃ 3) Melting point of the high glass was almost proportional to the SiO2 content with its purity. 4) Heat treatment had no effect on the SiO2 content.
산용해법에 의한 유리섬유의 실리콘디옥사이드 변동에 관한 영향
육종일,지동선 한국섬유공학회 1988 한국섬유공학회지 Vol.25 No.5
Environmental factors affecting the SiO2 content change of glass fiber caused by the acid solution method were experimented and investigated, and the following results were obtained by analyzing the kinds of acid, concentration, treating time and temperature. 1. In the acid treatment, plain weave showed the maximum value, 97% of SiO2 content in conditions where HC1 concentration was 3N, treating time 95 minutes and treating temperature was 9$0^{\circ}C$, while 5-H satin showed the maximum value, 96% of SiO2 content where HC1 concentration was 3N, treating time 90 minutes and treating temperature was 8$0^{\circ}C$. 2. Respectively 1% increment of SiO2 content was shown for both cases in which plain weave was water-cleansed for 15 minutes in hot water of 7$0^{\circ}C$, following the acid treatment and 5-H satin for 17 minutes. 3. 1 or 2% of A12O3 is remained after water-cleansing, because ionic bonding is lagrer than that of other metallic oxide compounds and so perfect ionization is impossible. 4. Fiber structure was the most stable when it was heat-treated at 80$0^{\circ}C$ for 60 minutes.
페놀 수지를 매트릭스로한 무기섬유 복합재료의 융삭 현상
육종일,모상영 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.5
In order to define the ablation phenomena of the inorganic fiber reinforced ablative materials, the chop type specimen and the laminate one of phenol resin matrix composites have been reinforced with carbon, silica and glass fiber, respectively, were made and examined by the oxy- acetylene torch testing method for 110 seconds. The ablation phenomena, the microstructural change by the internal stress were studied. And both the backface temperature and the weight decrease were measured with the ablation time. Results obtained are as follows. Char layer of the ablative materials is being grown by the repeated actions of melting, decomposing and vaporizing and it is porous at surface region but dense inner the surface one. The deposition of carbon originated from the decomposition of vaporized gases was occured at the surface and resulted in formation of hard layer. Back face temperature of the ablative materials was ordered as follows, carbon-phenolic>glass-phenolic>silica-phenolic. Though the back face temperature of the laminate type was higer than that of the chop type, the thermal resistance of the laminate type is thought to be superior to that of the chop type as materials for high temperature ablation.
육종철,고병준,박용집 대한전기학회 1970 전기의 세계 Vol.19 No.4
A neutron detector, in general, can not be utilized as the thermal neutron detecting chamber in the nuclear power reactor, especially P.W.R. due to the characteristics of high temperature, high pressure and high neutron flux in a reactor vessel. We have performed an experiment to detect the thermal neutrons at 400.deg. C and high flux of thermal neutron in a power reactor. Coating boron-10 on the aluminium plates by means of surface diffusion method at 600.deg. C for 5 hours in an electric furace, also we made a typical chamber which was compensated ionization chamber filled with free air as an ionization gas. It was checked the chamber characteristics in the TRIGA MARK-II Reactor at the power level from zero to 250KW. The chamber current showed a perfect linear increase to power increase. However, many variation of the measured current were observed within the power of 50KW.
육종관,이홍민,박한규,Yook, Jong-Gwan,Lee, Hong-Min,Park, Han-Kyu 대한전자공학회 1989 전자공학회논문지 Vol. No.
주파수에 따른 유효 유전율의 변화를 기존의 설계식에 첨가함으로써 C-ban와 X-band 이상의 넓은 주파수 범위에서도 적용할 수 있는 정방형 마이크로스트립 패치 안테나의 설계 방식을 제안하였다. 제안된 설계 방식을 이용하여 동일한 두께와 유전율을 갖는 마이크로웨이브 기판위에 7개의 안테나를 각 주파수별로 제작하여 실험함으로써 기존의 설계식들이 갖는 부정확성을 극복할 수 있음을 확인하였다. 7GHz에서 15GHz에 이르는 주파수 범위에서 실험한 결과 공진주파수는 예측한 주파수에서 오차가 ${\pm}1%$ 이내인 범위에 들어옴을 알 수 있었으며, 또한 제작한 안테나의 방사패턴도 이론값과 거의 일치하였다. An accurate design method for rectangular microstrip patch antenna that can be applied to wide range of frequencies (C-band to X-band) is proposed. With due regard the frequency dependent effective dielectric permittivity to design formula, the inaccuracy of previous design formulae can be overcome. The results predicted by new procedure are compared well experimental results that had varying operation frequencies between 7GHz and 15GHz. Antennas are fabricated over microwave substrates with the same dielectric permittivity and thickness. Radiation power patterns are also measured and they well with theoretical values.