• Korean Journal of Medicinal Crop Science
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• v.12 no.4
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• pp.321-327
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• 2004

Cortex of Ulmus davidiana var. japonica N. and Hemipteleae davidii P. have been used without classification according to countries as oriental medicine for treatment of various disorders. This study was conducted to elucidate the difference in antioxidant activity and total phenol content of these medicinal materials. Root cortex and trunk cortex of two medicinal plants were extracted with 80% ethanol $(at\;85^{\circ}C)$ and water (at room temperature), respectively. All of the extracts at $200{\sim}5\;{\mu}g/ml$, showed more effective scavenging activity on superoxide radical than ascorbic acid, and 80% ethanol and water extracts of Ulmus root cortex (URC) was more effective. Scavenging activities on DPPH radical of 80% ethanol extracts from URC and Ulmus trunk cortex (UTC) at 10 ${\mu}g/ml$, (41.4, 35.6%) were higher than those of the other six extracts and ${\alpha}-tocopherol\;(2.3{\sim}24.0%)$. Inhibitory activities on human low density lipoprotein (LDL) oxidation of 80% ethanol extracts from UTC and URC (84.3, 81.7%) at $10\;{\mu}g/ml\;(31.3{\sim}78.2%)$ were higher than those of the other six extracts and ${\alpha}-tocopherol$. However, antioxidant activities on linoleic acid peroxidation of all of the extracts were relatively lower than that ${\alpha}-tocopherol$. Total phenol content of 80% ethanol extract from URC was the highest value as 50.8% and that of water extract from HRC was the lowest as 5.6% among the extracts. From these results, it is suggested that Ulmus root cortex was the most effective in antioxidant activity.

• Korean Journal of Agricultural and Forest Meteorology
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• v.15 no.3
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• pp.178-185
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• 2013

Forest fires are expected to increase in severity and frequency under global climate change and thus better understanding of fire dynamics is critical for mitigation and adaptation. Researchers with different background, such as ecologists, physicists, and mathematical biologists, have developed various simulation models to reproduce forest fire spread dynamics. However, these models have limitations in the fire spreading because of the complicated factors such as fuel types, wind, and moisture. In this study, we suggested a simple model considering the wind effect and two different fuel types. The two fuels correspond to susceptible tree and resistant tree with different probabilities of transferring fire. The trees were randomly distributed in simulation space with a density ranging from 0.0 (low) to 1.0 (high). The susceptible tree had higher value of the probability than the resistant tree. Based on the number of burnt trees, we then carried out the sensitivity analysis to quantify how the forest fire patterns are affected by wind and tree density. The statistical analysis showed that the total tree density had greatest effect on the forest fire spreading and wind had the next greatest effect. The density of the susceptible tree was relatively lower factor affecting the forest fire. We believe that our model can be a useful tool to explore forest fire spreading patterns.

• Food Science and Preservation
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• v.13 no.5
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• pp.629-633
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• 2006

Pinus rigida Miller leaf extract (PRLE) showed antimicrobial activity remarkably against food pathogenic and spoilage bacteria at concentrations of $100{\sim}250{\mu}g/mL$. Alcohol-soluble PRLE had higher antimicrobial activity against Staphylococcus aureus and E-coli than any other-soluble PRLE such as butanol, ethyl acetate, ether and water. As PRLE concentration increased alcohol-soluble PRLE increased the remarkable inhibitory zone of microbial growth on the microbial media. PRLE showed good stability against temperature and pH in the range of $40{\sim}150^{\circ}C$ and $4{\sim}11$, respectively. This may indicate that PRLE can be a potential anti-microbial agent for industrial application. In addition, SEM of Listeria monocytogenes suggested that it antimicrobial component would perturb the functions of microbial cell membranes synergistically. In the feeding experiment the formaldehyde content in the serum of formalin-fed and PRLE-treated me decreased remarkably due to the lysis of formaldehyde and the rate of hemoglobin biosynthesis was recovered to the orignal state within a short breeding time.

• Korean Journal of Plant Resources
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• v.33 no.2
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• pp.93-105
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• 2020

The study was investigated in vegetation and environmental factors of Thuja koraiensis habitats where provided for ecological evidence data for conservation and management. Study plots were located at altitudes of 1,000~1,588 m with inclinations of 10~30°. A total of 150 taxa was identified 22 quadrates in 6 study sites. The highest basal area was analyzed in Mt. Gariwangsan 49.98 ㎡/㏊ with the lowest Mt. Hwaaksan 3.46 ㎡/㏊. Thuja koraiensis forest was classified into two communities; Abeis nephrolepis-Taxus cuspidata community, Betula ermanii-Thuja koraiensis community. As a result of Multi-Response Permutation Procedures test, there was significant difference among the communities.

• KOREAN POULTRY JOURNAL
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• v.40 no.12
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• pp.98-100
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• 2008

2008년 새해를 맞이하면서 좀 더 나은 삶을 간절히 기도했다. 오직 나뿐만 아니었을 것이다. 그러나 간절한 기도는 고통으로 물든 은행나무 잎처럼 우리들 가슴을 새까맣게 물들이고 말았다. 우리 육계인은 품질 좋은 병아리와 사료를 공급 받아 좋은 닭고기를 생산하기 위해 지극 정성으로 키우고 있다. 그런데 올봄에는 느닷없이 조류인플루엔자 발생으로 전국을 떠들썩하게 했다. 국민에게 위압감을 주는 과잉보도로 소비는 바닥으로 떨어지고 말았다. 육계인들은 말로 표현할 수 없는 엄청난 고통을 당했다. 그 고통이 사라지기도 전에 곡물 파동까지 이어져 사료공급이 중단될 위기까지 겪고 있을 때 원유 폭등과 환율 폭등으로 우리 육계인들의 마음은 한시도 편한 날이 없는 한 해였다. 폭풍우 같은 한해가 지나가자 한미 FTA도 우리 육계 산업에 크나큰 걸림돌이 아닐 수 없다. 다행히도 정부와 여, 야 모두 관심을 가지고 있다. 그 관심에 희망과 용기를 가져본다.

• 한국경영정보학회:학술대회논문집
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• 2007.11a
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• pp.611-616
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• 2007

반도체 패키징 공장에서 싸이클타임(Cycle-time)을 정확히 예측하는 것은 납기일 준수를 통해 고객만족도를 향상시킬 수 있고, 보다 효율적인 스케쥴링을 가능하게 하여 공장 가동률을 높일 수 있게 한다. 그러나 반도체 패키징은 제품 종류가 다양하고 제품마다 특화된 기술을 사용할 뿐만 아니라 공정 순서나, WIP에 따라 싸이클타임이 크게 영향을 받아 그 정확한 예측이 매우 어렵기 때문에 현장 전문가의 판단에 의존하는 경우가 많았다. Fab공정의 경우 전문가를 도와 좀 더 정확한 예측에 도움을 주기 위해 그 동안 전통적 통계 기법 및 시뮬레이션에 기반한 의사결정 모형이 많이 연구되었는데, 최근에는 기계학습 및 인공지능 기법을 사용한 연구가 눈에 띄고 있으며 기존의 방법보다 우수한 성능을 보여 주는 것으로 나타났다. 하지만 아직 기계학습 및 인공지능을 이용한 충분한 연구가 진행되지 못하고 있는 실정이다. 따라서 본 연구에서는 사례기반 추론을 사용하여 패키징 공정의 싸이클타임을 예측하고자 하였으며 그 성능을 인공신경망 모형, 의사결정나무 모형, 그리고 해당 분야 전문가의 예측치와 비교하였다. 실험결과에 따르면 사례기반추론 모형이 가장 뛰어난 성능을 보이는 것으로 나타났다.

• Korean journal of applied entomology
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• v.54 no.1
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• pp.39-41
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• 2015

Two species of the genus Cosmophorus (Hymenoptera: Braconidae) are reported in this study. Among them, Cosmophorus (Cosmophorus) klugii Ratzeburg is new to Korea. Diagnosis and distribution data are included.

• The Optical Journal
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• s.141
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• pp.18-20
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• 2012

"내일 지구가 멸망하더라도 나는 오늘 한 그루의 사과나무를 심겠다" 17세기 네델란드 태생의 철학자인 바뤼흐 스피노자가 이렇게 말했다고 한다. 그는 유럽의 대표적인 합리주의 철학자로 인정받으며 '에티카'를 통해 서양철학계에 커다란 화두를 던지기도 했다. 하지만 스피노자의 직업은 잘 알려져 있지 않았다. 그의 직업은 좀 색다르다. 그는 당시로는 파격적인 사상을 지닌 덕에 유대사회에서 추방됐고 카톨릭은 그의 모든 서적을 금서로 지정했다. 결국 스피노자는 렌즈를 가공하는 일로 생계를 유지하게 된다. 현대적 관점에서 보면 직가공에 의한 구면렌즈 가공이 이미 17세기 이전에 일반화된 것이다. 현대의 광학계 가공은 스피노자의 시대와는 비교할 수 없을 만큼의 다양한 기술적 발전에 힘입어 고정밀화, 비구면화, 양산화의 방향으로 진행되고 있다. 특히 성형 방식에 의한 비구면 렌즈 제조는 관련 분야의 핵심 기술이 되고 있으며 최근에는 적외선 렌즈에도 적용되고 있다.

• Journal of Practical Agriculture & Fisheries Research
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• v.12 no.1
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• pp.11-19
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• 2010

This study was carried out to investigate the characteristics survey of Clavicorona pyxidata strains. C. pyxidata are selected 3 kinds of strains collected in GWANG DEOCK Mt., DO BONG Mt., and BUK HAN Mt., Mycelial growth of C. pyxidata collected from GWANG DEOCK and BUK HAN Mt. is 64mm, 60mm for 18days respectively. DO BONG Mt strain is 85mm for 9 days. Transparent crystal body of C. pyxidata mycelia were appeared by microscopic examination of 100 magnification. Optimal temperature of mycelial growth in C. pyxidata strains are 25~30℃ respectively.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.23 no.1
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• pp.50-56
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• 2011

To make conservative port and coast ecosystems and creative the greenspace, We were investigated with characteristic of flora, environmental factors, types of port, adaptive species, minimum conservation area and plantation model. In 50 sites of study areas, there are 19 families and 174 species of vascular plants and 19 families and 48 species of halophytes. Dominant communities in port ecosystem contains Carex kobomugi community, Elymus mollis community, Carex pumila community, Ixeris repens community, Vitex rutundifolia community, Calystegia soldandlla community, Rosa rugosa community, Lathyrus japonica community, Salsola komarovi community, Cynodon dactylon community, Tetragonia tetragonioides community, Suaeda japonica community, Suaeda maritima community, Zoysia sinica community and Phragmites communis community. We carried out Canonical Correspondence Analysis(CCA) for ordinations on the vegetation and plant communities-environmental variable matrices in 50 sites. The communities tended to cluster into three types: Clay marsh, Sand marsh, Sand gravel marsh types. Adaptive species in habitate types are selected that sand marsh-type communities in ports contained Elymus mollis community, Ixeris repens community, Carex kobomugi community, Carex pumila community, Clay marsh-type communities contained Suaeda japonica community, Phragmites communis community, Zoysia sinica community and Suaeda maritima community, Sand gravel marsh-type communities contained Vitex rutundifolia community, Calystegia soldandlla community. We are conducted the estimation of minimal area for plantation of adaptive plant species and carried out guide line and plantation model for creation of green space in port ecosystem.