• Journal of the Korean earth science society
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• v.43 no.6
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• pp.661-679
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• 2022

Plate tectonics, with the continental drift theory and later strongly supported by the sea-floor spreading theory with evidence of paleo-geomagnetic fields, ocean floor sediments, successfully explained the slow but continuous movements of rigid lithospheres in geological time. Initially, plate motions were described as relative movements between adjacent plates, mainly based on paleo-geomagnetic reversal data. The advent of space geodetic techniques in the 1980s enabled direct measurements of plate velocities and assessment of deformations within certain regions. In this review, early relative plate motion models are briefly summarized, the no-net-rotation frame theory and corresponding models are explained, and the characteristics of the most recent models that incorporate intraplate deformation are described. Additionally, the plate motion section of the International Terrestrial Reference Frame is introduced, and a few recent case studies of local plate motion are briefly described; for example, in South America, Europe, Antarctica, and Turkey. Finally, studies of plate motion in northeastern Asia focusing on the Korean Peninsula are introduced.

• Journal of the Korean association of regional geographers
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• v.16 no.3
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• pp.249-264
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• 2010

This study is to comparatively analyse the place names on "Cheonggu-do"("靑邱圖", manuscript edition, 1834) and "Daedongyeo-jido"("大東輿地圖", woodblock-edition, 1861). Though the same person-Kim, Jungho(金正浩)- published those maps, and the latter was based on the former map, place names on thos maps are very different. The hypothesis is that those different information on maps were not from the cartographic, but from the social aspects at that times. The whole township names on "Cheonggu-do" were erased in "Daedongyeo-jido". The other names such as mountain, river, port, castle, beacons, official waer houses were recorded instead of township. Especially military names which were recorded newly in "Daedongyeo-jido", such as castle, beacon, ranches for the defense of nation, was geographical distributed in a strategic and key point in the northern and coastal area. This shows that there were rules for the mapping of "Daedongyeo-jido" and those rules could be come from the social demand.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.11a
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• pp.203-203
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• 2001

패선/구부림 가공은 후가공의 일부분으로서. 박스가공 시 종이에 패션치기와 구부림 공정이 들어가게 되며 이때 종이표면이 약할 경우 금이가는 현상이 발생한다. 본 연구 는 이러한 가공과 다층판지의 물성이 패선/구부림 적성에 영향을 미치는가에 대한 연 구로서 2000년도 추계논문발표시 종이 물성 중 패션/구부림 가공에 영향을 주는 것으 로 표면층의 층간결합력과 내절도 그리고 인장강도가 중요한 변수로 작용하는 결과를 얻었으며 이후 이들 영향인자 중 핵심영향인자의 도출을 위하여 침엽수를 배합하지 않 은 상태에서 상질고지 재생펄프를 고해 처리하여 특성을 향상시켜 실제 공정에서 실험 하였다. 1차 실험은 공정실험 전 예비 실험으로서 재생펄프를 공장 refiner를 사용하여 고해 처리하여 강도향상 효과를 분석하였다. 분석결과 인장강도는 증가하나 내절도 향상은 기대에 미치지 못하는 것으로 나타났다. 이에 따라 1차 공정실험 조건을 부착량을 향상 시켜 인장강도를 침엽수 펄프 배합수준으로 끌어올리는 방법을 선택하였으며 그 결과 패선/구부림 적성이 기존대비 양호한 결과를 얻었다. 즉 인장강도 향상으로 침엽수 펄 프를 대체할 수 있다는 결론을 얻었다. 2차 실험은 부착량 대선 refiner를 사용하여 상 질고지 재생펄프를 고해 처리하여 인장강도를 향상시켜 생산하였다. 실험결과 인장강도 가 침엽수펄프 배합 시 대비 동등이상 수준에 있을 경우 패션/구부린 가공 시 금이가 는 터짐문제는 발생하지 않는 것으로 나타났다. 3차 실험은 두 차례 동안 실시된 공정 실험을 기준으로 refining 처리와 부착량 기준을 설정하고 장시간 생산하여 그 특성을 측정하였다. 실험결과 표면층의 인장강도가 낮아질 때 패선/구부림 적성이 약해지는 경 향을 보였으며 인장강도가 기존 침엽수펄프 배합대비 동등이상일 경우 패선/구부림 가 공적성이 양호하게 나타났으며 실제 가공업체에서도 터짐 문제가 발견되지 않았다. 결론적으로 표면층의 인장강도가 패션/구부림에 가장 중요한 변수로 작용하며 어떠 한 형태로 표면층의 인장강도를 향상시킬 경우 침엽수 펄프는 재생펄프로 대체가 가능 할 것으로 판단된다.

• Journal of Food Hygiene and Safety
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• v.30 no.4
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• pp.383-389
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• 2015

This study was to examine the antioxidative activity of fermented Rhynchosia nulubilis (FRN) in obese rats. Oxidative stress due to reactive oxygen species (ROS) can cause oxidative damage to cells. Mitochondria are especially important in the oxidative stress as ROS have been found to be constantly generated as an endogen threat. Mitochondrial defense depends mainly on superoxide dismutase whereas microsomal defense depends on catalase, which is an enzyme abundant in microsomes. Seven weeks-aged female Sprague-Dawley rats were divided into four groups and fed high fat diets for 44 days. Also fermented Rhynchosia nulubilis was administered orally for 44 days at 7.5 ml/kg of body weight of rats. The antioxidative activities of fermented Rhynchosia nulubilis were measured by the superoxide dismutase, catalase, malondialdehyde levels in liver homogenate. The levels of malondialdehyde in FRN-treated groups were lower than those in obese groups. Superoxide dismutase and catalase levels were significantly increased. These results demonstrated that fermented Rhynchosia nulubilis had the inhibitive effects of oxidative stress in obese rats, suggesting that fermented Rhynchosia nulubilis would be used as an ingredient of the useful functional products.

• Journal of the Korean Society of Radiology
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• v.12 no.5
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• pp.623-630
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• 2018

Non-alcoholic fatty liver disease is the most common cause of chronic liver diseases. This study was to characterize early hepatic lipid changes in fatty liver rat model by in vivo short-echo time(TE) $^1H$-MRS(Proton - Magnetic Resonance Spectroscopy). Each the examinations were measured from liver parenchyma in rats at 0, 2, 4, 6, 8 weeks followed by high fat diet, respectively. Significant increase in lipid signals. 0.9, 1.3, 2.3, 2.8, and 5.3 ppm was found in animals with 2 weeks(p<0.01). Therefore, $^1H$-MRS is useful in detecting and characterizing various hepatic lipid alterations as early as 2 weeks for the start high fat diet.

• Journal of Sericultural and Entomological Science
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• v.41 no.S2
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• pp.21-42
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• 1999

뽕잎의 지금까지 박ㄹ혀진 생리활성은 중금속 흡착과 해독효과, 황산화 효과, 혈중지질 억제효과 및 혈당강하 효과를 들 수 있는데, 요약하면 다음과 같다. 1) 뽕잎이 Cd과 Pb같은 중금속에 대한 흡착 및 해독작용에 미치는 영향을 조사해 본 결과, 납중독으로 인하여 감소된 Hb와 Haematocritcl가 뽕잎 투여로 증가되었고 특히 gpa합성에 관여하는 DALAD효소 활성을 증가시켰다. 또한 뇨로의 Pb의 배설 효과가 뽕잎 투여로 증진되었으며 각 조직으로의 Pb축적을 감소시켰다. Cdwndehr으로 중독시킨 흰쥐에서도 감소된 Hd와 Haematocritcl가 뽕잎투여로 증가되었고, 특히 간조직 중의 Cd축적을 61%로 감소시켜 유의성있게 감소시켰다. 또한 뽕잎투여로 인하여 변으로의 Cd의 배설효과는 38%였고 이는 녹차투여 효솨보다는 낮은 수준이었다. 2)뽕잎의 향산화 효과는 녹차와 거의 비슷하였고 특히 혐기 처리함으로써 그 활성이 증가하였다. 또한 뽕잎중의 황산화 활성 성분은 10여종 flavonoidfb 이었고 그 중 quercetin이 가장 높은 황산화 활성을 나타냈다. 특히 dlavonidfb 화합물 중 kaempferol계열의 화합뭉이 황산화 효과가 높음을 알수 있었다. 3) 뽕잎의 고지혈 억제작용에 미치는 영향을 알아본 결과 뽕잎은 혈중 총 콜레스테롤이 차지하는 비율을 보였고 특히 혈중 중성지질 함량을 감소시킴으로써 정상의 80%수준까지 회복시켰다. 또한 콜레스테롤 생합성에 관여하는 효소활성을 뽕잎의 메탄올 추출물 중 물분획뭉이 59.9%수준으로 억제시켰고 지방분해효소 활성은 유의적인 수준은 아니었지만 16% 증가시켰다. 4) 뽕잎의 혈당강하 효과는 뽕잎을 질소가스를 이용하여 혐기처리하는 경우 유의적으로 그 효과가 증강되었다. 또한 뽕잎은 대조약물인 acarbose의 10배 용량에서 대조약물보다 23% 이상의 혈당강하 효과를 나타냈다. 이들의 혈당강하 효과는 같은 농도에서 인슐린 함량을 27%회복시켰으며 특히 surcrose와 maltose와 같은 이당류를 부하시켰을 때 혈당 강하 효과는 유의적이었다. 이는 뽕잎의 혈당강화 효과는 인슐린생합성 증가에 의한 것보다는 glucosidase의 활성을 억제시키는 기전이 더 많이 관여하는 것으로 판단할수 있었다. 또한 뽕잎 중의 혈당강하 성분으로 알려진 1-deoxynojirimycin 함량은 혐기처리로 인하여 그 함량이 5%정도 증가됨을 확인할 수 있었다. 이러한 뽕잎의 생리활성 결과에 기초할 때, 뽕잎은 고지혈증을 포함한 성인병 질환의 예방과 회복에 관련되는 조절기능을 생체에 충분히 발휘할수 있는 기능성 식품의 중요한 자원으로 이용될 수 있으리라 판단된다.

• Journal of Food Hygiene and Safety
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• v.13 no.3
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• pp.268-273
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• 1998

The present study has been undertaken to investigate the effects of ginseng extract on the activities of several enzymes in serum of rats fed lard and alcohol. Thirty-five males of Sprague-Dawley strains weighed about 130 g were divided into 7 groups, each group receiving a different diet for 10 weeks; i.e. basal diet plus 15% lard, basal diet plus 5% alcohol, basal diet plus 5% ginseng extract, basal diet plus 15% lard and 5% ginseng extract. Determinations were carried out on the net weight gain, food efficiency ratio, weight of organs, and AST, ALT, lactate dehydrogenase, alkaline phosphatase activities in serum of rats. The results obtained were as follows:Rats given feed containing lard and alcohol showed significant decrease in net weight gain, but ginseng extract caused an increase in food efficiency ratio. Lard supplementation caused an increase in the weight of liver, kidney, spleen, but another groups did not. AST, ALT, ALP, LDH of serum were significantly increased in lard and alcohol containing group but ginseng extract feeding decreased enzyme activities compared to lard and alcohol containing group. The above results suggest that ginseng extract would prevent the metabolic disease of liver by preventing hyperlipemia caused by high fat diet.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.33 no.1
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• pp.88-96
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• 2015

This purpose of this study was to identify the landscape characteristics of cultural heritage area in Gapgot fortification by performing text analysis of related literature and antique maps. And accumulate modern photograph to investigate the landscape of modern. As a additionally analysis, was examined landscape of Gapgot fortification area using aerial photograph. The results were as follows. First, Gapgot fortification has the historical value as symbolic and practical gateway to Ganghwa island caused by geographical position. And historical culture resources were located in Gapgot fortification area such as through traffic, military facilities. Secondly, According to literature and antique maps, Gapgot fortification area was village and military facilities from Goryeo dynasty. The village and military facilities was expanded with Jinhae pavilion since construct Ganhwa castle. Thirdly, In modern Gapgot fortification area appear consecutive coastal landscape when entry Ganghwa bridge. But, inhibiting elements of landscape should be remedied.

• Journal of the Korean Society of Food Science and Nutrition
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• v.21 no.3
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• pp.247-254
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• 1992

In the experiment in which young chicks were fed the semisynthetic diet devoid of choline or the same diet with butanolamine supplementation, the weight gain was decreased significantly accompanied by the reduction of feed consumption in choline deficient chicks as compared to control chicks. However, the overall effects of choline deficiency on the relative liver weight, lipid contents of liver, and plasma lipid and lipoprotein levels were not observed, nor was the response to choline deficiency on the incorporation of $^{14}$ C-oleic acid into lipids in the liver microsomes. When hyperlipidemia was induced by estrogen treatment, the liver lipids, as well as relative liver weight, showed a tendency to be increased only in the chicks fed the semisynthetic diet devoid of choline with butanolamine supple-mentation. And the magnitude of elevation of VLDL lipids by estrogen treatment was the lowest in the above group. These results indicated that young chicks were not able to synthesize considerable choline for normal growth ; nevertheless, the release of VLDL by hepatocytes was performed normally. But it was also implied that there might be some problems of VLDL release under the condition of hyperlipidemia in chicks in choline deficiency accelerated by butanolamine supplementation.

• The Korean Journal of Community Living Science
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• v.27 no.1
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• pp.137-145
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• 2016

This study evaluated the effect of Allium hookeri roots on lipid metabolism of the serum, liver, and adipose tissues induced by a high-fat diet in male Sprague-Dawley rats. The rats were divided into four groups with 8 rats per group for 4 weeks: the normal-diet group (N), the high-fat diet (HFD) group, the HFD containing 3% Allium hookeri (HFD-A3) group, and the HFD containing 5% Allium hookeri (HFD-A5) group. The results showed that the body weight gain and food intake of rats in the HFC-A3 and HFC-A5 groups were significantly decreased compared with those in the HFD group. The epididymal adipose tissue weight in the HFD-A5 group was significantly decreased compared with those in the HFD group, and adipose tissue weights of liver and mesenteric adipose tissues in the HFD-A3 and HFD-A5 groups were significantly decreased compared with those in the HFD group. Serum triglyceride, total cholesterol and LDL cholesterol concentrations, atherogenic index, and cardiac risk factor were significantly lower in the HFD-A3 and HFD-A5 groups than in the HFD group. Serum lipid profiles, as well as ALT and AST activities did not show any difference in all groups. Serum ALP and LDH activities were suppressed in the HFD-A5 group compared with those in the HFD group. The hepatic triglyceride and total cholesterol levels of rats in the HFD-A5 group was significantly lower than those in the HFD group. Moreover, triglyceride and total cholesterol in the epididymal and mesenteric adipose tissues were significantly lower in the HFD-A5 group than in the HFD group. These results demonstrated that the intake of Allium hookeri showed a hypolipidemic effect, changing the lipid metabolsim of a high-fat diet induced rats.