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이영기,Lee, Young-Ki 대한토목학회 2014 대한토목학회논문집 Vol.34 No.3
The objective of this test series was to determine shear load per unit length which causes a unit slip in the fastener joint. The shear load is one of major factors which reflect partial composite action for cold-formed steel wall stud panels. Test method used were based on the methods presented in the 1962 AISI Specification. According to the comparison with experimental strength, it is seen that the shear loads used in nominal axial strength predictions made acceptable results.
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Agrobacterium rubi와 A. tumefaciens에 의한 국화 뿌리혹병
이영기,차재순,박경석,황혜경,황태호,김진영,이재국 한국식물병리학회 2006 식물병연구 Vol.12 No.3
Crown gall on lower stem and root of chrysanthemum(Dendranthema grandiflorum Kitamura) was observed at Hwasung and Gumi in 2001 and 2004, respectively. Tumors were semi-round with rough surface texture of dark brown color. Nine isolates inducing gall formation on lower stem of chrysanthemum among twenty isolates from the tumor tissues were characterized. Their colonies were convex, glistening, circular with an entire edge and whitish or tannish cream in color on potato dextrose agar supplemented with 0.5% CaCO3. The virulent isolates were rod-shaped with peritrichous flagellae, gram negative, aerobic and growing on D1M agar. Among nine virulent isolates, one isolate was identified as Agrobacterium rubi and eight isolates were A. tumefaciens based on biochemical and physiological characteristics, fatty acid profiles and substrate utilization patterns. A. tumefaciens had strong pathogenicity and broad host range compared with A. rubi. This is the first report on crown gall of chrysanthemum in Korea. To our knowledge, crown gall of chrysanthemum caused by A. rubi is first report in this study worldwide.
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항암성 생약제로 부터 항암성분의 추출 및 항암활성 측정
이영기,신석우,염곤 단국대학교 신소재기술연구소 1993 신소재 Vol.3 No.-
암치료에 많이 사용되는 생약제 16종을 대상으로 항암활성을 규명하고자 in vitro에서 세포 독성능을 측정하여 다음과 같은 결과를 얻었다. HEP 2 cell에 대해 세포 독성능을 높게보인 생약제는 하고초>고삼>화누>선복화 순이었고, HeLa cell에 대해 세포독성능을 높게 보인 생약제는 선복화>아출>포공영>화누>구맥>하고초>고삼>오공>금은화>천문동 순 이었다. RAW 71 cell에 대해 세포독성능을 높게 보인 생약제는 구맥>화누>고삼>호모초>천문동 순 이었고, VERO E6 cell에 대해 세포 독성능을 높게 보인 생약제는 선복화>하고초 순 이었다. 또한 Herbal drug 처리에 의한 HEP 2와 HeLa 세포의 세포 독성능과 Staphylococcus aureus의 항균력간의 관계를 알아본 결과 HEP 2 cell은 약 43%, HeLa cell은 약 71%가 일치하였다. We tested the cytotoxic ability on the tumor cell line by 16 kinds of herbal drugs of which contains the alkaloids and flavoids which shows high antitumoral activity. This has been done on the condition of in vitro. the conclusion are as follows. 1. The herbal drugs which have shown the strong cytotoxic activity to HEP 2 cell are as follows. Prunella vulgaris has the strongest activity, followed by Sophorra angustifolia>Trichoosanthes kirilowii>Inula brontannaca. 2. The herbal drugs which have shown the strong cytotoxic activity to HeLa cell are as follows. Inula britannica has the strongest activity, followed by Curcuma zedoooaria>Tarazacum platycarpum>Trichosanthes kirilowii>Dianthus sinesis>Prunella vulgaris>Sophra angustifolia>Scolopendra subspinpes>Lonicera Japonica>Asparagus cochinensis. 3. the herbal drugs which have shown the strong cytotoxic activity to RAs 71 cell are as follows. Dianthus sinesis has the strongest activity, followed by Trichosanthes kirilowii>Sophra angustifolia>Corispermum stauntoni>Asparagus cochinensis 4. The herbal drugs which have shown the strong cytotoxic activity to VERO E6 cell are as follows. Inula britannica has the strongest activity, followd by Prunella vulgaris. 5. After the treatment with herbal drugs, the relationshipbetween the cytotoxic activity to HEP 2 and HeLa cell, the antimicrobial activity of Staphylococcus aureus was found. these two activites show the similarity of about 43% in HEP 2 cell and 71% in HeLa cell.
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李榮基 동국대학교 경주대학 1992 東國論集 Vol.11 No.-
Recent research on the effects of exchange rate volatility is discussed. This paper examines the relationship between volatility of the real and norminal exchange rates and trade volumes during the floating and fixed exchange rate system the Korean Economy. Empirical results indicate that, during the floating period, exchange rate volatility has not discouraged export and import volumes. Rather, during the fixed exchange rate period, real and nominal exchange rate volatility have discouraged export volumes, thus, I find that risk of exchange rate uncertainty does not affect on trade volumes, and system choice of floating exchange rate does not levy the expected high adjustment costs to the Korean economy.
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Agrobacterium larrymoorei와 A. tumefaciens에 의한 벤자민고무나무 뿌리혹병
이영기,명인식,구한모,차재순,황혜경,황태호 한국식물병리학회 2006 식물병연구 Vol.12 No.3
Crown gall on lower stem of weeping fig (Ficus benjamina Roxb.) was first observed at Daejon in 2003. Tumors were about 15 cm in size and semi-round with rough surface texture of dark brown color. Two virulent isolates among ten bacteria isolated from the tumor tissues were characterized. Their colonies were convex, glistening, circular with an entire edge, and white or tannish cream in color on potato dextrose agar supplemented with 0.5% CaCO3. They were rod shape with peritrichous flagellae, gram-negative, aerobic growth, oxidase-positive, and grew on D1M agar. The isolates were identified as Agrobacterium larrymoorei and A. tumefaciens based on biochemical and physiological characteristics, fatty acid profiles and substrate utilization patterns. Seedlings of some host plants excepting grapevine produced typical galls two to three weeks after inoculation with cell suspensions of the virulent strains. This is the first report on crown gall of weeping fig in Korea.
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李榮基 서울대학교 교육대학원 1969 論文集 - 서울대학교 교육대학원 Vol.6 No.-
Geologic time of the Okcheon System is not fixed and is a focus of debate among the geologists in Korea. Through the field survey, the writer has found clear evidence of nonconformity between the igneous body and the Okcheon System which overlays the igneous body, and a new evidence which the other igneous body intrudes the Okcheon System. Under the microscope, the possibility of absolute geologic age dating by K-Ar method is found because one involves a little biotites and the other much K-feldspars. Therefore, the geologic time of the Okcheon System could be clarified very possibly by the law of intrusion when the absolute geologic age of the two igneous rocks is determined. And also, the strong possibility of new establishment of the Pucknori Formation's (one member of Okcheon System) stratigraphic position has been found.
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