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최석호 대한양계협회 1980 월간 양계 Vol.12 No.4
젊은이들의 날카롭고 신선한 눈으로 보는 업계와 그 문제점은 어떠한가? 본지에서는 4월호부터 '젊은이의 발언대'난을 신설하여 젊은이들의 많은 참여를 바라고 있다. 이번호는 그 첫벗째로서 최석호군의 눈에 비친 업계와 그 비젼을 들어본다.
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Graphene-Based Vertical-Junction Diodes and Applications
최석호 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.6
In the last decade, graphene has received extreme attention as an intriguing building block for electronic and photonic device applications. This paper provides an overview of recent progress in the study of vertical-junction diodes based on graphene and its hybrid systems by combination of graphene and other materials. The review is especially focused on tunnelling and Schottky diodes produced by chemical doping of graphene or combination of graphene with various semiconducting/ insulating materials such as hexagonal boron nitrides, Si-quantum-dots-embedded SiO2 multilayers, Si wafers, compound semiconductors, Si nanowires, and porous Si. The uniqueness of graphene enables the application of these convergence structures in high-efficient devices including photodetectors, solar cells, resonant tunnelling diodes, and molecular/DNA sensors.
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최석호,임영순 한국낙농식품응용생물학회 2019 한국유가공기술과학회지 Vol.37 No.1
The effects of yogurt supplementation with enzyme-bioconverted ginseng (EBG), ascorbic acid, and yeast extract on the bacterial counts of Streptococcus thermophilus, Lactobacillus acidophilus LA-5, and Bifidobacterium BB-12 were investigated to develop healthy yogurts with high probiotic counts during storage. In addition, the colors and viscosities of the yogurts were determined. EBG, ascorbic acid, and yeast extract did not affect S. ther- mophilus counts. EBG and ascorbic acid enhanced the viabilities of L. acidophilus LA-5 and Bifidobacterium BB-12 during storage. Yeast extract improved growth of L. acidophilus LA-5 and Bifidobacterium BB-12 during fermentation. EBG turned the yogurt into brown color. We conclude that supplementation of yogurt with EBG, ascorbic acid, and yeast extract may enhance its health-promoting functions by increasing the viability of probiotics, which can thus promote consumption of the yogurt.
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최석호,이관수,김인규,이동혁 대한설비공학회 2004 설비공학 논문집 Vol.16 No.9
The stack effect of a new type condenser installed in a high-rise apartment building was studied numerically. A sirocco fan is introduced to the new type condenser instead of an axial flow fan. The new type condenser intakes the cold air through the lower inlet and exhausts the hot air through the upper outlet. The effects of the building height and frontal wind on the performance of an air-conditioner were analyzed. The performance of an air-conditioner was evaluated by using COP (coefficient of performance) and CGPI (condenser group performance indicator). The hot air was exhausted by the new type condenser at an angle of 50 from the outer wall of the building. If there was no draft, the new type condenser installed in the high-rise apartment building had a good performance and its performance on each floor is not influenced by the stack effect. It is shown that the efficiency of the air-conditioner installed in several floors below the top floor decreased when the frontal wind velocity was greater than 8 m/s.
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Anti-Outer Membrane Protein 면역단백질을 이용한 Sandwich ELISA 방법에 의한 우유 내 Salmonella의 검출
최석호 한국축산식품학회 2004 한국축산식품학회지 Vol.24 No.2
우유내 Salmonella를 검출하기 위한 Sandwich ELISA의 특이성을 조사하였다. Sandwich ELISA에 사용한 항체들은 OMP 분획을 닭에 면역주사하여 얻은 IgY와 OMP 분획을 gel filtration하여 얻은 분자량 40,000의 OMP를 토끼에 면역 주사하여 얻은 토끼 IgG를 사용하였다. Immnoblot assay에서 IgY는 분자량 6,000의 OMP에 강하게 반응하였으며 토끼 IgG는 분자량 40,000, 35,000과 6,000의 OMP들에 강하게 반응하였다. IgY와 토끼 IgG는 Salmonella typhimurium의 다른 단백질에도 반응하였다. Competitive ELISA에서 IgY가 Salmonella의 두 개 균주에 대해 특이성을 나타냈으며 Eshcherchia coli와 Yersinia enterocolitica에 의하여서는 반응을 나타내지 않았다. 우유에 세균을 첨가하여 실시한 sandwich ELISA에서 Salmonella typhimurium 2균주가 가장 높은 흡광도를 보였다. Salmonella cholerasuis 균주들은 상대적으로 흡광도가 낮았으며 이루 일부 Salmonella cholerasuis 균주들은 비 Salmonella 균주들과 차이가 없었다. The specificity of sandwich enzyme-linked immunosorbent assay (ELISA) to detect Salmonella in milk was determined in this study. The antibodies used in sandwich ELISA were egg yolk immunoglobulin G (IgY) obtained after immunization of hen with outer membrane protein (OMP) fraction from Salmonella typhimurium and rabbit IgG obtained after immunization of rabbit with the purified OMP with the molecular weight of 40,000. The immunoblot assay showed that the IgY reacted strongly with OMP with the molecular weight of 6,000 and the rabbit IgG reacted strongly with OMP with the molecular weights of 40,000, 35,000, and 6,000 from the bacteria including Salmonella which belongs to Enterobacteriaceae. The IgY and rabbit IgG also reacted with other proteins from Salmonella typhimurium in immunoblot assay. Competitive ELISA showed that IgY showed specifity to react with two strains of Salmonella typhimurium and Salmonella cholerasuis but not with Escherichia coli and Yersinia enterocolitica. Two strains of Salmonella typhimurium added to UHT milk showed the highest absorbance of all the bacteria used in the sandwich ELISA. Some strains of Salmonella cholerasuis showed higher absorbances than non-Salmonella bacteria.
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SWRO 전처리 공정에 적용된 DABF 내 Ball Media Filter 성능 평가
최석호,이정현,박성주,이영근,노형근,김용범 한국물환경학회 2019 한국물환경학회지 Vol.35 No.6
DABF(Dissolve Air Flotation with Ball Filter) is developed as the DAF with the addition of a fiber ball at the lower part of the DAF. The DABF with a capacity of 4,500 m3/h was constructed at Gijang SWRO plant in Busan. Since the ball filter has high filtration rate, the loading rate of DABF was designed from 20 to 42 m3/h/m2. When one DABF basin is in the back washing mode, the loading rate of other two DABF basins is increased to 42 m3/h/m2. Turbidity at the BF outlet in DABF is <2 NTU at turbidity of 5-10 NTU at the BF inlet. If there is no algae bloom and turbidity is low in raw seawater, only BF in DABF is operated and meets <2 NTU at the BF outlet. Even if BF is operated at high hydraulic loading rates, no significant differential pressure increases and reduction in the turbidity removal rate is minimal in a day. Thus, DABF is the pre-treatment technology that provides stable water quality even with BF onlyoperation without DAF operation. Compared with the DAF, DABF requires additional facilities such as valves, piping, and drainage systems for backwashing the BF. But in terms of footprint and operating costs, DABF has more advantages than DAF. With DABF application, the load of the downstream filtration equipment is decreased so that the capacity of the filtration equipment can be reduced. Also, if the downstream filtration equipment is to be maintained the same regardless of DABF, the operating cost of DABF is less than DAF.
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