젊은이 발언대 -축산업계에 대한 나의 바람

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.

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.

Effect of Ge-Nanodot Incorporation on Light-Emission from ZnO Thin Films

최석호,이도규,김성,김창오,엄성환,오형택 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6

ZnO films have been implanted with Ge- ions to doses (nGe) of (1.5 ∽ 4) ×1016 cm-2 and subsequently annealed at 700 ∽ 1000 ℃ for 20 min to form Ge nanodots (NDs) within the ZnO matrix. Transmission electron microscopy images demonstrate the existence of irregularly-shaped Ge NDs of ∽15 to ∽30 nm in the central region of the Ge--implanted ZnO films (ZnO:Ge) after annealing. The photoluminescence (PL) spectra of the annealed ZnO:Ge films are observed in the infrared (IR) range of ∽0.75 to ∽0.95 eV and show a maximum intensity at nGe = 1.5 ×1016 cm-2, which is consistent with the dose-dependent relative intensity ratio of UV and visible PL emissions from near-band-edge and oxygen-related deep levels (DLs), respectively. These PL behaviors are attributed to the Ge suboxide states at the interfaces of Ge NDs/DL sites and Ge-related molecular complexes within the ZnO matrix, as confirmed by the X-ray diraction patterns. ZnO films have been implanted with Ge- ions to doses (nGe) of (1.5 ∽ 4) ×1016 cm-2 and subsequently annealed at 700 ∽ 1000 ℃ for 20 min to form Ge nanodots (NDs) within the ZnO matrix. Transmission electron microscopy images demonstrate the existence of irregularly-shaped Ge NDs of ∽15 to ∽30 nm in the central region of the Ge--implanted ZnO films (ZnO:Ge) after annealing. The photoluminescence (PL) spectra of the annealed ZnO:Ge films are observed in the infrared (IR) range of ∽0.75 to ∽0.95 eV and show a maximum intensity at nGe = 1.5 ×1016 cm-2, which is consistent with the dose-dependent relative intensity ratio of UV and visible PL emissions from near-band-edge and oxygen-related deep levels (DLs), respectively. These PL behaviors are attributed to the Ge suboxide states at the interfaces of Ge NDs/DL sites and Ge-related molecular complexes within the ZnO matrix, as confirmed by the X-ray diraction patterns.

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.

Viability of Probiotic Bacteria in Yogurt Supplemented with Enzyme-Bioconverted Ginseng, Ascorbic Acid, and Yeast Extract

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.

북한사회 진단서:북한의 스포츠 용어와 스포츠 전력 점검

최석호 북한연구소 1985 北韓 Vol.- No.165

고층 아파트에서 응축기 적층문제 분석

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.

Physicochemical effects of different processing temperatures on 5-hydroxymethyl-2-furaldehyde and the volatile flavor of domestic honey

최석호,남명수 충남대학교 농업과학연구소 2021 Korean Journal of Agricultural Science Vol.48 No.4

This study was performed to suggest concentration methods leading to the production ofhoney with an excellent flavor by examining the effects of the concentration temperature and method on changes in 5-hydroxymethyl-2-furaldehyde (5-HMF) levels and the flavor components of honey. The 5-HMF contents of honey samples concentrated in a tray concentrator at 45, 50, 60, and 70℃ were 2.1, 2.3, 2.5, and 3.1 mg·kg-1, respectively, demonstrating that the 5-HMF contents increased as the concentration temperatures were increased. The honey vacuum-concentrated at 70℃ showed a higher 5-HMF content than that at 60℃, similar to the tray-concentrated honey at different temperatures. The main and other minor flavor components of the honey were volatilized and significantly reduced after vacuum concentration. In the tray concentration, all of the honey samples concentrated at 40, 50, 60, and 70℃ showed flavor component patterns similar to each other, and most of the main and other minor flavor components in the honey were volatilized and significantly reduced after tray concentration. As such, most of the main and other minor flavor components of the honey were mostly removed at 70℃ after both the vacuum concentration and tray concentration processes. The effects of the concentration method and temperature on the viscosity, 5-HMF level, and flavor components of the honey were found to be significant in this study. Given that the components of honey were shown to undergo significant physicochemical changes depending on the concentration method used and temperature during laboratory-scale production, the concentration methods devised in this study can be applied industrially.

NH3 와 H2O2 주입에 의한 배연가스내의 SO2 제거

최석호,백민수,유정석,김태희,김정일,김유석,문길호 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.1

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2 . 젖산균 성장용 질소화합물 급원배지의 개선에 관한 연구

최석호,김현욱 한국축산학회 1979 한국축산학회지 Vol.21 No.3