• Korean Journal of Pharmacognosy
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• v.49 no.3
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• pp.240-245
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• 2018

The fruits of Eleutherococcus sessiliflorus (Rupr. & Maxim.) S. Y. Hu (Araliaceae), as edible fruits, were traditionally used for ingredients of wine or tea in Eastern Asia. In addition to, the fruits of E. sessiliflorus were known for having antioxidant and anti-inflammatory effects. Recently, we investigated that the ethanolic extracts of E. sessiliflorus fruits (DHP1501) have effects on hypertension via vasorelaxation and decrease of blood pressure. In the present study, we investigated that the gene and protein expression levels of endothelial nitric oxide synthase (eNOS) was increased by treatment of DHP1501 in HUVECs. Moreover, we confirmed the angiotensin converting enzyme inhibitory activity of DHP1501 through in vitro tasks. Therefore, DHP1501 could be a candidate of functional food for alleviating hypertension.

• Proceedings of the KIEE Conference
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• 2002.11b
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• pp.91-93
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• 2002

자가발전기가 운전되는 산업체 전력계통에서 대형 유도전동기 기동 특성을 안정도 해석 프로그램을 이용하여 해석하고 과도한 기동전류로 발생하는 전압 강하 문제를 해결하기 위해 기동방안을 모의하여 적정성을 검증한 실계통 적용 연구사례이다.

• YAKHAK HOEJI
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• v.60 no.2
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• pp.73-77
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• 2016

Alginic acid and carboxymethyl cellulose sodium are dietary fibers from plants. They have a swelling property and delay the gastric emptying time, thereby resulting in feeling satiated after oral administration, which may eventually contribute to loss of body weight. The goal of this study was to compare swelling property of three commercial matrix tablets based on alginic acid and carboxymethyl cellulose sodium. When the swelling was determined by the Korean Ministry of Food and Drug Safety (MFDS) guideline, the tablet prepared by direct compression method with highly viscous swelling agent showed the highest swelling in acidic conditions. Water uptake of these tablets was rapid and completed within 30 min. Moreover, when the pH was changed from 2.5 to 6.8 buffer, the water uptake was not significantly changed in all tablets.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1134_1135
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• 2009

태양광발전 출력은 인버터를 통하여 상업용 전력계통에 연계된다. 소형 태양광발전 전력은 다수의 수용가를 포함하고 있는 기존의 22.9kV 배전선로에 직접 연결되며, 비선형 전력전자소자로 구성된 인버터는 고조파를 발생하게 된다. 본 논문은 태양광발전소 고조파를 실측하여 이를 모델로 연계 전력계통에 미치는 고조파 영향을 전력계통 해석 도구인 소프트웨어로 분석한 것이다.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.287-289
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• 2008

전력계통에서 풍력발전 점유율이 지속적으로 확대되고 있다. 고장전류 계산은 풍력발전소 및 연계 전력계통 보호계전 방안 수립 등을 포함한 전력계통 구성방안 수립 등에 이용되는 기초 자료이다. 현재 건설되고 있는 풍력발전소 관련 자료를 토대로 고장전류를 계산하여 실효성 있는 계통계획 기초 자료로 이용하고자 한다.

• Korean Architects
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• s.606
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• pp.70-75
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• 2019

• Korean Architects
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• s.580
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• pp.78-91
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• 2017

• Economic and Environmental Geology
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• v.18 no.1
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• pp.11-22
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• 1985

The Daehwa and Donsan tungsten-molybdenum deposits are composed of numerous fissure-filling veins developed in Precambrian gneiss and Cretaceous granite and quartz porphyry. K-Ar age of biotite in granite and that of muscovite in ore veins are $105{\pm}5\;Ma$ and 88.2~88.6 Ma respectively. Occurrence of ore deposits shows that relevant igneous rock is possibly quartz porphyry rather than above mentioned granite in temporal view point. Vein structure and mineralogy suggest that ore veins were formed by continuous vein filling, not by repeated mineralization. Three distinct depositional stages with decreasing age can be devided on the basis of mineral paragenesis and fluid inclusion studies: Stage I, deposition of oxides and silicates; stage II, deposition of base-metal sulfides and sulfosalts with carbonates; stage III, deposition of barren calcite and fluorite. Tungsten, molybdenum and tin mineralization occurred in stage I.

• Journal of the Economic Geographical Society of Korea
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• v.25 no.2
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• pp.254-263
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• 2022

• Journal of the Korean institute of surface engineering
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• v.41 no.5
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• pp.245-253
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• 2008

The porous metal material is used for injection metal mold with a great deal of gas production because it makes plenty of gas exhausted through pores formed in the metal mold. A canning HIP method was conventionally used for manufacturing of porous metals, but because of difficulty of process control and high cost of production its application was limited. In this experiment, porous metal mold material was produced by an enhanced vacuum sintering method with simply controlled and economical process and porosities/mechanical properties with variation of sintering temperature and duration time during vacuum sintering were studied. As a result, quality goods were obtained at optimized conditions as follows: sintering temperature of $1230^{\circ}C$, duration time of 2 hr and showed superior properties in wear loss and thermal conductivity and the same properties in hardness, TRS (Transverse Rupture Strength), and thermal expansion coefficient in comparison with those under canning HIP.