• The Journal of Engineering Geology
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• v.26 no.2
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• pp.207-221
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• 2016

As greater numbers of fill dams and reservoirs become old, the risks of damage or embankment collapse increases. However, few studies have considered the deterioration and hazard classification of the internal core layers of fill dams. This study reports the results of geotechnical investigations of 13 earth-cored fill dams in Korea, based on no-water borehole drilling, Standard Penetration Test, and 2D and 3D electrical resistivity surveys along with in situ and laboratory testing. High-capacity no-water boring minimized core layer disturbance while providing continuous core sample recovery. The results allow the classification of potential hazards related to the existing core layers based on both visual inspection of the recovered samples and the results of engineering surveys and tests. Four types of potential hazard are classified: locally fluidized core with a high water content, rapid water inflow to a borehole, cores with granular materials, and relatively low stiffness of core. Among these, the locally fluidized core is the most critical hazard that requires remedial action because it is related to the potential internal flow path and internal erosion. The other three hazard types are of medium importance and require careful monitoring and regular inspection. Of note, there was no correlation between age and core deterioration. The results are expected to aid the safe management and potential upgrading of aging cored fill dams.

• Applied Chemistry for Engineering
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• v.28 no.1
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• pp.42-49
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• 2017

To replace phthalate plasticizer for PVC, acetylated monoglyceride (AMG) plasticizers were prepared from plant oil and their plasticization effects were also investigated. Transesterification of coconut oil by glycerol followed by acetylation with acetic anhydride gave AMG-CoCo (Coco : Coconut Oil). In addition, AMG-GMO (GMO : Glycerol monooleate) and AMG-GMO-Epoxy were synthesized by acetylation and epoxidation with glycerol monooleate. It was found that the thermal stability of AMG plasticizers increased in the following order: AMG-GMO-Epoxy > AMG-GMO > AMG-CoCo and all three plasticizers were thermally more stable than those of common petroleum-based plasticizer DOP (Dioctyl phthalate). The tensile strain values of the PVC containing AMG compounds were ca. 770~810%, while tensile strength values were ca. 19~22 MPa, which were higher than those of PVC containing DOP. DMA (Dynamic Mechanical Analysis) results showed that the miscibility of AMG-GMO-Epoxy in PVC was excellent and the $T_g$ of PVC containing AMG-GMO-Epoxy at 50 phr decreased down to $24^{\circ}C$. Finally, the leaching experiment result showed that the weight loss values of PVC containing AMG-GMO and AMG-GMO-Epoxy at 50 phr were as low as 2 and 1%, respectively, indicating that they have high water migration resistance. The above findings suggested that AMG-GMO-Epoxy could be one of plant oil-based PVC plasticizers to replace DOP.

• KSBB Journal
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• v.17 no.4
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• pp.381-387
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• 2002

A filamentous fungus, strain FB01 showing high $\beta$-glucosidase activity was isolated from a compost. This fungus was cocultured with Trichoderma viride to enhance the productivity of $\beta$-glucosidase by changing inoculation time of the fungus. The microbial consortium showed higher cellulolytic enzyme production than T. viride alone. The maximal enzyme production was obtained when the microbial consortium was cultured at 30$\^{C}$ and pH 6.0 for 10 days with the activities of CMCase, $\beta$-glucosidase, and avicelase of 2.0, 0.8, and 0.2 U/mL, respectively. These enzyme activities were 2, 4, and 2 times as high as those of CMCase, p-glucosidase, avicelase from T. viride, respectively, indicating that a synergistic interaction appeared between T. viride and strain FBOI . The serial subcultures with pH control increased $\beta$-glucosidase production about 3.2 times. Enzyme production using ricestraw as a carbon source showed that the activities of CMCase, $\beta$-glucosidase, and avicelase were 3.69, 0.76, 0.17 U/mL, respectively, and $\beta$-glucosidase activity was 1.5 times higher than that of T viride.

• Journal of Korean Medical classics
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• v.13 no.1
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• pp.146-183
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• 2000

통과이상적연구(通過以上的硏究), 장상한학술적성숙기(將傷寒學術的成熟期), 칙지명대여청대관여상한의학사적내용정리(則至明代與淸代關與傷寒醫學史的內容整理) 여하(如下). 1. 명청시대적시대배경사상한학적내용갱풍부(明淸時代的時代背景使傷寒學的內容更豊富), 촉진상한학술적발전(促進傷寒學術的發展) 병차출현료흔다관여상한적저작(幷且出現了?多關與傷寒的著作), 단실제상야출현료상한론내용적중복여지론술일반부분(但實際上也出現了傷寒論內容的重複與只論述一般部分), 혹저자립안조잡적처방지폐단(或著者立案粗雜的處方之弊端). 차기우출현각종상한학파적리유(此期又出現各種傷寒學派的理由), 시인위당시류행적사조(是因爲當時流行的思潮), 칙정주리학적영향여명대문단부고(則程朱理學的影響與明代文壇復古), 의고적추향(擬古的趨向), 환유금원시대적백가쟁오등(還有金元時代的百家爭嗚等), 성료형성상한학파적기초(成了形成傷寒學派的基礎). 2. 위료불실거상한론적본래의식(爲了不失去傷寒論的本來意識), 주장정리화고정원문회부왕숙화이전모양적착간중정파시왕안도기료개단(主張整理和考訂原文恢復王叔和以前模樣的錯簡重訂派是王安道起了開端), 방유집확대료기의식(方有執擴大了其意識). 유창여침명종시대표저학파학자(喩昌與沈明宗是代表這學派學者), 장로(張?) 정응모(程應?) 주양준(周揚俊) 오겸등수료저학설(吳謙等隨了這學說). 3. 주장(主張)'존왕(尊王)(숙화(叔和))찬성(贊成)(무기(无己))'적유호구론파(的維護舊論派), 주장료불능수변개상한론삼음삼양편적배렬여순서(主張了不能隨變改傷寒論三陰三陽篇的排列與順序), 문자(文字), 구문(句文), 문장(文章), 고세식(高世?), 진념조등인(陳念祖等人). 4. 주장상한론적정수재어변증론치(主張傷寒論的精髓在於辨證論治), 선우운용칙능득상한핵심리론적학파시변증론치학파(善于運用則能得傷寒核心理論的學派是辨證論治學派). 저학파분사개계통(這學派分四?系統), 이처방수집증상적의가유허굉(以處方收集證狀的醫家有許宏), 가금(柯琴), 서대춘(徐大椿); 이치법수집증상적의가유오인구(以治法收集證狀的醫家有吳人駒), 우이(尤怡); 이분유륙경찰증상적의가유진념조(以分有六經察證狀的醫家有陳念祖), 포성(包誠); 이증상분류증후적의가유류순(以證狀分類證候的醫家有劉純), 왕긍당(王肯堂), 진지정(秦之楨), 침금오등인(沈金鰲等人). 5. 회통파유량종류형(?通派有兩種類型), 일시수통상한여온병적학파(一是誰通傷寒與溫病的學派), 간칭회통파(簡稱?通派), 대표의가유도화(代表醫家有陶華), 오정(吳貞), 유근초등인(兪根初等人), 령일개유회통중의여서의적립장상해석상한적의가당종해(?一?有?通中醫與西醫的立場上解釋傷寒的醫家唐宗海). 6. 경전학파시이상한론위보귀적경전래인식(經典學派是以傷寒論爲保貴的經典來認識), 병차지유숭상차경여사상적학파(幷且持有崇尙此經與思想的學派), 차리분량개편우원문적고증래연구적경전고증파(此里分兩?偏于原文的考證來硏究的經典考證派), 화인위지유상한론(和認爲只有傷寒論), 재능총괄치료외감병(才能總括治療外感病), 부정온병학설병배척적경전림상파(否定溫病學說幷排斥的經典臨床派).

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.256-261
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• 2008

The curtain-wall work has been more frequently applied in the construction industry since demand of high-rise buildings has been increased. The curtain-wall work is usually performed with the frame work simultaneously for reducing construction period, but it might be delayed because of several problems caused by interference of process. However, there is not an appropriate tool which can be used by a work manager for adjusting quantity of the construction equipments or the workers when the curtain-wall work was delayed. To resolve this problem a construction simulation anticipating and analyzing potential problems before starting the work can be applied in the curtain wall work. This research suggests a general model for the curtain-wall work by using construction simulation and produces a combination of construction equipments and workers which can estimate optimum work productivity.

• Journal of the Korea Concrete Institute
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• v.15 no.3
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• pp.392-399
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• 2003

This paper discusses the validities of insulating curing of cold weather concreting at early stage by applying insulation forms. Tests were carried out using modified insulating form combining existing insulating form and various other insulations in order to develop improved insulation form. Temperature history of concrete using various insulating forms and insulation was measured to determine most effective combination of insulting form. According to results, as for the wall form, under the curing temperature of $-10^{\circ}C$, the temperature of concrete using Euro form drops sharply before 24 hours and lasts below $0^{\circ}C$ for 7 hours. The temperature of concrete using the form combining Polypropylene panel, styrofoam and plywood panel keep above $0^{\circ}C$. And, it is confirmed that the form mentioned above has a favorable effects on enhancing strength development of concrete and the cost to make the forms shows more reasonable than that of existing forms. However, as for the combination methods of insulation form for slab, which is composed of insulating form at the bottom of slab and various surface curing materials at the top of slab, in case of exposed condition at the top of slab, temperature history of concrete goes below $0^{\circ}C$ after 10 hours. In case of the combination of vinyl sheet and curing blanket, it drops below $0^{\circ}C$ after 42 hours. However, in case of the combination of vinyl, styrofoam and curing blanket, it does not go below $0^{\circ}C$ until 55 hours. Accordingly, compared to the case of exposure and the combination of vinyl and curing blanket, it indicates that the combination mentioned above has more effective insulating performance.

• Journal of the Korean Society of Food Science and Nutrition
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• v.21 no.1
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• pp.17-22
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• 1992

Water extract, and free-, ester- and insoluble phenolic acids were extracted from wormwoods. The extracts were then dissolved in equal amounts of an edible soybean oil, and the resulting substrates, portion of the soybean oil (control), 0.02% BHA and 0.02% BHT were stored in incubator at $45^{\circ}C{\pm}1.0^{\circ}C$ for 32days. Peroxide values (POV) and thiobarbituric acid (TBA) values of control and the substrates were determined during th9 storage period. The POV of control, BHA, BHT and six substrates which were contained water extracts 0.5%, 1% and 1.5%, and free-, ester- and insoluble phenolic acids after 24days of storage were 77, 43, 17, 38, 26, 34, 45, 28 and 16m mole/kg oil respectively, The TBA values after 32days of storage were 0.278, 0.170, 0.070, 0.200, 0.178, 0.235, 0.167, 0.136, 0.062, respectively, It was found that the antioxidant activity in water extracts was highest in water 1 (the substrates containing water extracts 1%). It was also found that antioxidant activities in the phenolic acids were decreased in the following order ; insoluble phenolic acids>ester form>free phenolic acids. The phenolic acids separated and tentatively identified by Gas chromatography were catechol, vanillin, umbelliferone, p-coumaric acid, ferulic acid caffeic acid, protocatechuic acid, p-hydroxy benzoic acid and syringic acid.

• Journal of Ginseng Research
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• v.24 no.4
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• pp.188-195
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• 2000

Using Ginseng saponins (crude saponin and total saponin) and ginsenoside Rbl Rb2, Rc, Rd, Re, Rhl, and Rh2 in this study, we have examined the effects of the compounds on the induction of differentiation in normal rat mammary epithelial cells and 7,12-dimethylbenz[a]anthracene (DMBA)-induced mammary tumor cells in culture. When normal rat mammary organoids were cultured in 100-mm culture plates in the presence or absence of ginseng saponins, there were four different cell colonies after two weeks in culture: cobble stone, spindle, honey comb, and senescence type colonies. Ginseng saponins showed different effects on the development of each colonies. Scrape-loading dye transfer tech-nique was performed to measure the effects of total saponin, Rhl, and Rh2 on intercellular junctional communication. Intercellular communication was not observed at short cultilral time, e.g., four or seven days, but when it cultured it up to two weeks, cell to cell communication was observed in saponin-treated cells. Reconstituted basement membrane, Matrigel, supported the growth and development several different multicellular structures from normal mammary organoids (e.g., ductal, webbed, stellate, and squamous colonies) or DMBA-induced mammary tumor (e.g., alveolar unit, foamy alveolar unit, squamous metaplasia, lobule-ductal, stellate, and webbed colony). In ginseng saponin-treated groups, webbed colonies were more and squamous colonies were less than control group. Moreover, the ductal colonies, marker tructure of well-differentiate mammary epithelial cells, were developed more in saponin-treated group than in control group. In conclusion, ginseng saponins affected on the differentiation of normal rat mammary epithelial cells and DMBA-induced mammary tumor cells in culture.

• Korean journal of applied entomology
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• v.5_6
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• pp.1-7
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• 1968

The present investigation was initiated to find out the possible insect vector of the paulownia witches'-broom virus disease. 1. Among a number of piercing-sucking mouth type insects that were feeding on the witches'-broom infected Paulownia leaves, the tobacco leaf bug, Cyrtopeltis tenuis REUTER, was most abundant. Eggs, nymphs and adults of Cyrtopeltis tenuis were observed from the mid-August through the end of October. 2. It was found that Paulownia witches'-broom virus is transmitted by Cyrotopeltis tenuis. 3. On young Pnulownia plants, first symptom appeared twenty days after exposure to virus-bearing colonies of Cyrtopeltis tenuis. Forty days after exposure to these viruliferous insects, the characteristic symptom of Paulownia witches'-broom was apparent. 4. Paulownia witches' -broom virus was also transmitted by Cyrtopeltis tenuis to calendula and morning glory. No app"rent symptom was observed from tomato, carrot. aster, zinnia, cosmos, soybean and plantago at least until sixty days after exposure to the viruliferous colonies of Cyrtopeltis tenuis. 5. Calendula and morning glory appear to be highly suitable test plants for Paulownia witches'-broom vims because of their relatively short incubation period and distinct symptom appearance.

• Journal of Life Science
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• v.22 no.12
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• pp.1697-1703
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• 2012

Obesity is a risk factor for numerous metabolic diseases. Recently, naturally occurring compounds that may improve obesity have received increasing attention. Xanthigen is a mixture of fucoxanthin and punicic acid derived from brown seaweed and pomegranate seed, respectively, which have been traditionally used for lipid-lowering effects in humans. In this study, we investigated whether Xanthigen attenuates high-fat diet-induced obesity in C57BL/6N mice. The mice were fed on a normal diet (ND), high-fat diet (HFD), HFD plus 1% Xanthigen or HFD plus 1% green tea extract (GTE) for 11 weeks. Food efficiency ratio (FER) and body weight were significantly reduced in mice fed HFD plus Xanthigen compared to HFD-fed mice. Consistent with the results in body weight change, Xanthigen also significantly decreased the weights of epididymal adipose tissue, retroperitoneal adipose tissue, and liver in HFD plus 1% Xanthigen-fed mice. The serum level of low-density lipoprotein (LDL)-cholesterol was significantly decreased in HFD plus Xanthigen-fed mice compared to HFD-fed mice. These results suggest that Xanthigen may be useful in the development of a functional health food for anti-obesity.