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천조영 대한전기학회 1962 전기의 세계 Vol.9 No.-
직류기정류이론은 Arnold, Langsdorf등에 의하여 연구되어 왔으며, 이들은 정류방정식에서 정류주기중의 전류의 시간적변화와 정류주기종단에서 전류의 시간적 변화율의 값에 의하여 spark 발생여부를 판별하여 정류량부를 판별하였다. 본 논문은 상기한 방법과는 달리 정류의 기본방정식에서 정류곡선의 일반식을 구하고 정류곡선을 해석하여 정류양부를 판별하는 것이며, 정류주기중에 있는 단종선론의 coil저항과 연접한 극(pole)아래의 Brush에 의한 단각전류의 상호유도작용까지도 고려하였을때의 정류곡선의 일반식을 구하고 이를 해석하여 Langsdorf에 의하여 연구된 정류판별의 결과를 비교하여 정류판별에 대한 차이점과 명확한 결론을 제시코저 한다.
조영천(Youngchun Jo),강해용(Haeyong Kang),이현경(Hyunkyung Lee),전진호(Jinho Jeon),이현섭(Hyeonseop Lee) 한국물리학회 2024 새물리 Vol.74 No.1
Optoelectronic properties of a phototransistor made from solution-processed amorphous InGaZn oxide (a-IGZO) were investigated. This wide bandgap metal oxide semiconductor is known for its optical transparency, yet it exhibits visible light absorption attributed to sub-gap states resulting from oxygen vacancies. The study found that depositing a thin layer of aluminum oxide (AlO<SUB>x</SUB>) on the transistor channel led to an increase of photocurrent in the visible spectrum. Additionally, surface treatment of the a-IGZO thin film with UV ozone reduced persistent photoconductivity at 450 nm. Analysis of the absorption coefficient and optical band gap indicated that the results were associated with changes in the oxygen vacancy states within the a-IGZO thin film. The ability to control photocurrent and persistent photoconductivity through the deposition of aluminum (Al) and UV ozone treatment opens up exciting possibilities for applications in photosensors and neuromorphic systems.
생화학,분자생물학 : Bacillus속이 생산하는 Cyclodextrin Glucanotransferase에 의한 Stevioside로의 당전이반응
조영제 ( Jo Yeong Je ),천성숙 ( Cheon Seong Sug ) 한국응용생명화학회 2004 Applied Biological Chemistry (Appl Biol Chem) Vol.47 No.1
Cyclodextrin glucanotransferase (CGTase) of Bacillus sp. isolated from soil was purified and its enzymological characteristics were investigated. It was found that the production of CGTase reached to the maximum when the strain was cultured in the broth containing 0.1% albumin, 2% NH₄Cl, 2% soluble starch and 0.2% KH₂PO₄ for 72 hrs at 37℃. The purity of CGTase was increased by 9.7 folds through purification procedures by the following column chromatography DEAE-cellulose ion exchange chromatography and Sephadex G-100, G-150 gel filtration and its specific activity was 528.0 unit/㎎. The optimum PH and temperature for the CGTase activity were 8.0 and 80℃, respectively. The enzyme was stable in pH 8.0~11.0 at 60~80℃. The activity of purified enzyme was inhibited by Pb^(2+), Hg^(2+) and Zn^(2+). When CGTase was treated with each 20.5 unit, 41 unit, 205 unit and 410 unit to investigate the transglucosylation to stevioside by purified cyclodextrin glucanotransferase, transglucosylation rate to stevioside was 74.9%, 75.7%, 68.7% and 57.9%. Brown effect was observed above the concentration amounting to 205 unit of our CGTase.
식품 : 둥시 장아찌 제조 과정 중 세포벽성분 및 연화효소의 변화
조영제 ( Jo Yeong Je ),천성숙 ( Cheon Seong Sug ) 한국응용생명화학회 2004 Applied Biological Chemistry (Appl Biol Chem) Vol.47 No.1
Changes of cell wall components and softening enzyme during the preparation of persimmon pickles with soy sauce and soy paste were investigated. The contents of alcohol insoluble substance and cell wall extracted from persimmon pickles in soy sauce and soy paste were gradually decreased to the 20th day of storage and then decreased rapidly, but the contents of water soluble material extracted from persimmon pickles in soy sauce and soy paste was increased during the storage time (0~5O days). The contents of lignin, pectin and acid-soluble hemicellulose of persimmon pickles in soy sauce and soy paste were decreased during the storage, but contents of alkali-soluble hemicellulose was increased. The contents of cellulose almost did not change during storage of pickles. The hardness of persimmon pickles in soy sauce and soy paste was gradually increased up to the 30th day of storage and then decreased. The activities of polygalacturonase and pectinesterase as softening enzyme in persimmon pickles with soy sauce and soy paste increased during storage. And β-galactosidase activity was slightly increased to the 30th day of storage and after increased rapidly.