• 한국전기전자재료학회논문지
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• 제17권2호
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• pp.190-195
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• 2004

The effect of heat treatment on torsion characteristics of high nitrogen steel wire has been studied by torsion test, tensile test, specific resistivity, X-ray diffraction and scanning electron microscopy. After heat treatment at 600∼$700^{\circ}C$, torsion cycle was increased with increasing temperature. Especially, in case of high nitrogen steel wire heat teated at $650^{\circ}C$, torsion cycle was sharply increased. It is estimated that cold worked high nitrogen steel wire started to recrystallize and phase transform at 64$0^{\circ}C$ in air atmosphere.

• 대한전자공학회논문지
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• 제25권8호
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• pp.950-958
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• 1988

We have implemented a RTA system using W-halogen lamps and tried to recrystallize the phosphorus ion implanted amorphous silicon on insultor (SOI) taking advantages of seeding window. The purpose of this study is to investigate the possibility of a typical crystalline orientation occurred during the solidifying process of molten amorphous silicon layer. Experimental results show that several twin boundaries are found on the seeding window region after annealing for 15 sec at 1040\ulcorner. These twin boundaries represent that the recrystallization is partialy possible and when the annealing is done at 1150\ulcorner, (100) etch pits with <110> facets are found on the solidified amorphous silicon layer. Consequently, Hall mobility of recrystallized silicon film is measured and the thermal behavior of grain boundary is also observed by SEM.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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• pp.526-528
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• 2003

The effect of heat treatment on torsion characteristics of high nitrogen steel wire has been studied by using torsion test, micro vickers hardness and scanning electron microscopy. After heat treatment at $600{\sim}700^{\circ}C$, the torsion cycle was increased with increasing temperature. Especially, in case of high nitrogen steel wire heat treated at $600^{\circ}C$, the torsion cycle was sharply increased. It is estimated that the cold-worked high nitrogen steel wire started to recrystallize around at $650^{\circ}C$ in air atmosphere.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 C
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• pp.1469-1471
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• 2003

The effect of heat treatment on torsion characteristics of high nitrogen steel wire has been studied by using torsion test, micro vickers hardness and scanning electron microscopy. After heat treatment at $600{\sim}700^{\circ}C$, torsion cycle was increased with increasing temperature. Especially, in case of high nitrogen steel wire heat treated at $650^{\circ}C$, torsion cycle was sharply increased. It is estimated that the cold-worked high nitrogen steel wire started to recrystallize around at $640^{\circ}C$ in air atmosphere.

• 한국표면공학회지
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• 제26권3호
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• pp.127-134
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• 1993

P+ and BF2+ were implanted to LPCVD amorphous silicon films deposited on thermally-oxidized silicon wafers and the low temperature annealing process followed with various conditions to activate implanted ions and to recrystallize the films. We tried to find the optimum processing condition by comparing the recrystallization behaviors and the electrical properties. TEM analysis showed that the final grain size of BF2+-implanted films was similar to that of unimplanted films, whereas the grains of P+-implanted films. For both P+ - and BF2+ -implanted films, sheet resistances were decreased with elevating annealing temperature and the minimum value was about 110~120$\Omega$/$\square$ at $600^{\circ}C$.

• Journal of Information Display
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• 제2권3호
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• pp.44-47
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• 2001

The extracted field emission current can be used to controllably heat microfabricated cold field emission cathode tips. The heating can be sufficient to smooth and recrystallize the tip surface by surface self-diffusion, and at least partially clean the surface of contaminants by thermal desorption. Self-heating not only allows for the achievement and maintenance of stable emission characteristics, but can be used to make the current-voltage characteristics of microfabricated field emitter tips nearly identical to one another. The resulting improvement in emission uniformity will allow for more reliable array operation at increased electron emission current densities.

• 한국재료학회지
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• 제30권6호
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• pp.308-314
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• 2020

A commercial AA1070 alloy for electrical wire is severely deformed by drawing process in which a rod with an initial diameter of 9mm into is reduced to a wire of 2mm diameter. The drawn AA1070 wire is then annealed at various temperatures from 200 to 450 ℃ for 2h. Changes in microstructure, mechanical properties and electrical properties of the specimens with annealing temperature are investigated in detail. The specimen begins partially to recrystallize at 250 ℃; above 300 ℃ it is covered with equiaxed recrystallized grains over all regions. Fiber textures of {110}<111> and {112}<111> components are mainly developed, and {110}<001> texture is partially developed as well. The tensile strength tends to decrease with annealing temperature due to the occurrence of recovery or/and recrystallization. On the other hand, the elongation of the annealed wire increases with the annealing temperature, and reaches a maximum value of 33.3 % at 300 ℃. Electric conductivity of the specimens increases with annealing temperature, and reaches a maximum value of 62.6 %IACS after annealing at 450 ℃. These results are discussed in comparison with those for the other aluminum alloy.

• 열처리공학회지
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• 제6권4호
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• pp.185-193
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• 1993

The effect and Condition of heat treatment on the tensile strength of welded joint was investigated in 300 grade 18% Ni-Co-Mo-Ti maraging steel sheets welded with electron beam. A good tensile strength of welded joint was obtained by following heat treatment cycle ; At $1100^{\circ}C$ the specimen was high temperature solution treated for 1 hour and then it was repeated solution treated at $900^{\circ}C$, $820^{\circ}C$ for 1 hour respectively to recrystallize the coarsened ${\gamma}$ grain. These heat treatment cycle was completed by an final aging heat treatment at $480^{\circ}C$ for 4 hour. Moreover, dissolution of dendrite, a significant decrease in seregation of Mo, Ti in weld metal were observed and also the coarsened ${\gamma}$ grain formed at $1100^{\circ}C$, $1200^{\circ}C$ changed to fine grain due to the effect of recrystallization.

• 한국미생물·생명공학회지
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• 제21권1호
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• pp.47-53
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• 1993

순수분리된 2,000여주의 혐기성 세균으로부터 선발된 Clostridium sp. KN-431은 bacteria 및 fungi에 대하여 재현성있는 항균활성을 나타내는 항생물질 KG-431A와 KG-431B를 생산하였다. 이들 중 KG-431B는 항암활성이 1차 검색에서도 양성반응을 보인 바 이에 대한 후속연구를 계획중에 있다. 이들의 MIC 값을 비교해 보면 완전정제가 가능하였던 KG-431B 보다는 차라리 정제과정에서 많은 어려움이 따라 불완전 상태로 실험을 행한 KG-431A의 활성이 더 뛰어난 것을 알 수 있었다. 정제된 KG-431B의 여러가니 이화학적 특성과 spectra datark 기지물질인 3-IPA와 일치하나 본 실험을 통해 밝혀진 항암활성의 검색은 정제된 3-IPA에서는 아직까지 알려진 바 없는 생물학적 특성으로 간주된다. 또한 Clostridium 속에서 최초로 발견된 3-IPA 존재에 대한 결과는 아직 정제가 완료되지 않은 KG-431B에 관한 연구와 함께 후속적인 확인 연구가 진행중에 있다.

• 한국미생물·생명공학회지
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• 제1권1호
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• pp.13-18
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• 1973

Bacillus subtilis의 생균 및 포자액을 자외선 조사와 diethylsulfate 처리로서 adenine 요구변이주 총 62주를 분리하였다. 이들 변이주는 발효배지에 자외선흡수 물질을 축적하고 있음을 확인하였으며 이 축적물은 thin-layer chromatogram 자외선흡수 곡선등으로 hypozanthine, uracil 임을 동정하였다. 이 중에서 hypoxanthine만을 축적하는 변이주 BS-137의 배지성분을 검토한 결과 탄소원소로서는 glucose가 좋았으며 질소원으로서는 yeastext와 NaNO$_3$ 가 적당하였다. 아울러 배양액으로부터 hypoxanthine을 분리 정제하는 방법을 확립하였다.