• 식물병과 농업
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• 제5권1호
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• pp.55-57
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• 1999

Botrytis cinerea was isolated from a gray mo이 leaf lesion on persimmon in fields of Kyeonsangnam-do from 1996 to 1998, and etiological study was conducted including physiological characteristics. It formed gray mold lesion with light green color on leaves of persimmon (Diospyros kaki). The temperature range for mycelial growth was between $5^{\circ}C$ and $30^{\circ}C$ with the optimum temperatures of $20^{\circ}C$ to $25^{\circ}C$. Conidia were oviod, cylindric, and colorless and their dimensions in culture were $8.4~11.5\times7.0~8.9\mu\textrm{m}$. The optimum temperature of conidial germination was $25^{\circ}C$. Sclerotia on potato dextrose agar medium were well formed and brownish condiophores were observed with their size of $18.5~64.9\times4.5~8.0\mu\textrm{m}$. Symptoms on artificially inoculated plants were similar to those of gray mold disease on persimmon caused by Botrytis cinerea in fields.

• 한국세라믹학회지
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• 제32권5호
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• pp.559-566
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• 1995

Alumina powder was coated with stearic acid and then mixed with isotactic polypropylene, atactic polypropylene as binders at 15$0^{\circ}C$ for 2 hours. The mixture was then injection molded at various mold temperatures using injection molding machine to investigate the effect of the molding temperature and debinding parameters on the formation of the defects. The molded specimens were debinded in both air and nitrogen atmospheres. Wicking and solvent methods were also used to enhance debinding efficiency. The specimens were prefired at 120$0^{\circ}C$ and then sintered at 150$0^{\circ}C$ for 3 hours. Various defects were formed at mold temoperature of 3$0^{\circ}C$, 6$0^{\circ}C$ and 10$0^{\circ}C$ and any noticeable defect was not formed at 85$^{\circ}C$. The density of green body increased with mold temperature. Debinding in air atmosphere was more effective than in nitrogen atmosphere. Results also proved that wicking and solvent treatments helped minimize the number of defects.

• Elastomers and Composites
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• 제49권3호
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• pp.220-224
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• 2014

자동차 타이어의 트레드는 노면과 직접적으로 접촉하며 제동력, 구동력, 소음 등 중요한 역할을 한다. 트레드는 많은 그루브로 이루어져 있는데 고무의 형상을 형성하는 가류 공정에서 불량이 발생하게 되면 트레드의 기능이 저하되어 자동차 성능의 문제로 이어지게 된다. 본 논문은 CAE 해석을 통하여 가류 공정 중 구체적인 고무의 흐름을 분석하였다. 트레드 형상에 따라 고무 흐름의 편차가 발생하기 때문에 형상에 따른 트레드의 고무가 금형에 접촉되는 순서와 속도 그리고 고무의 흐름을 관찰하였다. 트레드의 형상에 따라서 고무가 금형에 안착되는 양상이 다르게 나타났으며 고무의 흐름에 큰 변화를 주는 것을 확인할 수 있었다.

• Preventive Nutrition and Food Science
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• 제13권1호
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• pp.51-53
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• 2008

To utilize edible red algae paper for food packaging, red algae paper coated with green tea extract or catechin was prepared and microbial growth in bread wrapped with the paper was determined during storage. The paper coated with green tea extract or catechin had antimicrobial activity against Escherichia coli. Packaging of bread with the red algae paper coated with green tea extract or catechin decreased the populations of total aerobic bacteria and yeast and mold after 2 days of storage by 0.41 and 0.63 log CFU/g, respectively, compared to the control. These results suggest that bread can be packaged by edible red algae paper coated with green tea extract or catechin, resulting in inhibit microbial growth during storage.

• Mycobiology
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• 제38권1호
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• pp.7-12
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• 2010

A green mold species that has not previously been reported in Korea was isolated from oak log beds used for shiitake (Lentinula edodes) cultivation that were infested by mushroom flies. In this study, we identify the mold species as Gliocladium viride (an anamorph of Hypocrea lutea) and describe its mycological properties. The fungus was cottony on both potato dextrose agar (PDA) and Czapek yeast extract agar (CYA), but was colored white on PDA and became yellowish green and brown on CYA. Mycelial growth on PDA attained a diameter of 73 mm at $30^{\circ}C$ after 5 days. The fungus grew faster on malt extract agar (> 80 mm, 5 days at $25^{\circ}C$) compared to CYA and PDA (< 68 mm, 5 days at $25^{\circ}C$). Penicillate conidiophores of the fungus are hyaline, smooth walled, branching above typically in four stages, and $120\sim240\;{\mu}m$ in length. Club-shaped or slender phialides are formed on the metulae. Conidia of the fungus were ovate and elliptic, yellowish brown and green, and $2.5\sim3.0\;{\mu}m\times1.8\sim2.3\;{\mu}m$ in size. Typically, slimy conidia are formed in a mass and colored brown to dark green to almost black. The internal transcribed spacer rDNA and translation elongation factor 1 alpha gene sequences of the fungus isolated here show 99% identity with previously identified G. viride strains.

• The Plant Pathology Journal
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• 제24권1호
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• pp.87-89
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• 2008

A blue mold on tomato fruit caused by Penicillium oxalicum occurred sporadically in a greenhouse at Gyeongsangnam-do Agricultural Research and Extension Services. Infection usually occurred through wounds or cracks on the fruits. Symptoms began with water soaking lesions, then became watery and softened eventually. Colony of the causal fungus was white at the early growing stage, turned green on Czapek yeast extract agar and malt extract agar. Conidia were ellipsoidal in shape and $2-6{\times}2-4{\mu}m$ in size. Stipes were septate, smooth, thin walled, and $90-280{\times}3-4{\mu}m$ in size. Penicilli were mostly biverticillate. Ramuli were 1-3 groups, smooth, and $10-16{\times}2-3{\mu}m$ in size. Rami were 1-2 groups and $6-30{\times}2-4{\mu}m$ in size. Metulae were 2-3(5) verticils, smooth, and $12-20{\times}3-4{\mu}m$ in size. Phialides were 5-7 verticilate, ampulliform to cylindroidal, smooth, and $8-12{\times}2-3{\mu}m$ in size. Optimum temperature for growth was about $25^{\circ}C$. Pathogenicity of the fungus was proved on tomato fruit according to Koch's postulation. On the basis of mycological and pathological characteristics, the fungus was identified as P. oxalicum Currie & Thom. This is the first report of the blue mold on tomato fruit caused by P. oxalicum in Korea.

• Design & Manufacturing
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• 제11권3호
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• pp.1-7
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• 2017

The fabrication process of micro pattern structure with high precision and high aspect ratio using powder injection molding (PIM) is developed. In the PIM process, the metal powder is mixed with the binder systems and the mixture is injected into the metal mold. The injection molded green parts are debinded and sintered to reach final shape and properties. In this method, the optimization of physical properties such as fluidity and strength of the binder system is essential for perfect filling the high aspect ratio micro-pattern. For this purpose, the correlation between the properties of the binder system and feedstock and ${\mu}-PIM$ process was investigated, and a binder system with low viscosity at low temperature(about $110^{\circ}C$) and high strength after cooling was investigated and applied. Employing this process, high precision parts with line type micro pattern structure which has pattern size $160{\mu}m$ and aspect ratio more than 2 can be manufactured.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.167-168
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• 2006

• 한국균학회소식:학술대회논문집
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• 한국균학회 2009년도 춘계학술대회 및 임시총회
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• pp.38-40
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• 2009

• 한국균학회지
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• 제39권3호
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• pp.213-216
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• 2011

2007년부터 2010년에 걸쳐 국내 8지역에서 블루베리의 병을 조사한 결과, 청양, 당진, 대전, 제주 지역의 온실에서 재배중인 블루베리의 신초, 잎, 꽃, 열매에서 잿빛곰팡이병 증상이 빈번하게 관찰되었으며, 조사된 다른 지역의 포장에서는 잿빛곰팡이병 증상이 관찰되지 않았다. 조사된 온실내 이 병의 발생율은 1~30%였다. 병반에서는 Botrytis속 균이 분리되었으며, 단포자 분리된 27개 균주의 형태적 및 배양적 특성을 조사한 결과, 모두 Botrytis cinerea로 동정되었다. 병원성 검정을 위하여 선발한 4균주를 4품종의 블루베리잎에 분생포자현탁액으로 인공접종한 결과, 4균주 모두 접종한 블루베리 잎에 자연병반과 유사한 병반을 형성하였다. 국내의 온실재배 블루베리에 발생하는 B. cinerea에 의한 잿빛곰팡이병은 본 연구에 의해 처음으로 보고된다.