• Title/Summary/Keyword: Lee Guang-su

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Suppression of Magnetization Ringing After Domain Wall Collision Studied by Micromagnetic Simulation

  • Djuhana, Dede;Piao, Hong-Guang;Lee, Sang-Hyuk;Jun, Su-Hyeong;Shim, Je-Ho;Kim, Dong-Hyun
    • Journal of Magnetics
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    • v.13 no.4
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    • pp.120-123
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    • 2008
  • Magnetization ringing following domain wall collision on a ferromagnetic nanowire has been investigated by micromagnetic simulation. Suppressed magnetization ringing is observed with the introduction of a small ribbon to the nanowire. Magnetization ringing has been analyzed in a frequency space by a fast Fourier transform. With the introduction of a small ribbon and/or taping of the wire, the amplitude of ringing is reduced with a shifted frequency peak.

Experiments Study on Critical Strain Properties of Sedimentary Rocks based on Mohr-Coulomb Strength Criterion (Mohr-Coulomb의 파괴기준을 기본으로한 퇴적암의 한계변형률 특성에 관한 연구)

  • Kim, Young-Su;Lee, Jae-Ho;Jin, Guang-Ril;Shin, Shi-Un;Kwon, Tea-Soon;Han, Hee-Su
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.821-832
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    • 2008
  • The hazard warning levels are necessary for the rational design and safety construction of underground space, as mountain and urban tunnel. Sakurai provided the hazard warning levels for assessing the stability of tunnels using the critical strain of rock mass, which is defined as a ratio between uni-axial compressive strength and the Young's modulus. The concept of critical strain guidelines is introduced in this study for the assessment of tunnel safety during excavation. Moreover, in this paper, the critical strain properties of sedimentary rock in Korea has investigated and analysed in detail by Lab. test, as the uniaxial and triaxial compression tests. Finally, critical strain properties of sedimentary rock on uniaxial and triaxial stress condition is discussed the relationship of failure strain values, uniaxial and triaxial compression strengths, confining pressure and Young's modulus.

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고창(鼓脹)의 처방(處方)에 대한 문헌적(文獻的) 고찰(考察)

  • Lee, Yong-Un;Kim, Il-Ryeol;Choe, Chang-Won;Lee, Gang-Nyeong;Lee, Yeong-Su;Gwak, Jeong-Jin;Kim, Hui-Cheol
    • Herbal Formula Science
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    • v.9 no.1
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    • pp.165-206
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    • 2001
  • After this study, I report the following result from it 1. 'Qiao zhang' is the symptoms that the abdomen is distension and fullness, but face, eye, four limb is not dropsial swelling. It corresponds to the Gu zhang(?脹), Zhang man(脹滿), Jiju(積聚), Dan fu zhang(單腹脹), Zhong man(重滿) of the Oriental Medicine. 2. The cause and overeating and, and malfunction pathology of the 'Qiao zhang' were accumulation of water cause of overeating and, overdrinking, the hurt of feeling, overwork, infection of blood sucker and malfunction of liver, spleen and kidney for jandice and Jiji(積聚) 3. The treatment of the 'Qiao zhang' was reinforcing middle-energizer and replenishing Qi and allevating water retention because middle-energizer were much weak. 4. The prescription of the 'Qiao zhang' that Zhang man fen xiao wan(中滿分消散) were 16 times the most. Zhang man fen xiao tang(中滿分消湯), Guang man kui jian tang(廣茂潰堅湯), ren shen gui pi tang(人蔘芎歸湯), Yu yu liang wan(禹餘糧丸), mun xiang sun qi tang(木香順氣散) were next. 5. The single herb of the prescription of the 'Qiao zhang' that were Auckrandiae Radix(木香), Citri Pericarpium(陳皮) for rephenshing qi drug, Atractylodis Macrocephalae Phieoma(白朮), Ginseng Radix(人蔘), Magnoliae Cortex(厚朴) for regurating qi drug, Pinelliae Rhzoma(半夏) for dischanging phlegm drug.

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Three Case Reports about Improving Vascular Dementia and Secondary Dementia (혈관성 치매와 속발성 치매 치험 및 호전 3례)

  • Yun Kyoung-Sun;Lee Ji-Hun;Kim Jae-Woo;Jeong Sung-Hyun;Shin Gil-Cho;Lee Won-Chul
    • The Journal of Internal Korean Medicine
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    • v.24 no.4_2
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    • pp.1103-1111
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    • 2003
  • Dementia is classified into Alzheimer's disease, vascular dementia and secondary dementia by its causes. Alzheimer's disease is hard to expect cognitive improvement, whereas vascular dementia and secondary dementia are reversible by medical treatments Dementia can be categorized as Chi-Mae(痴?), Geon-Mang(健忘), Huh-Ro(虛勞), Guang(狂), in the oriental medicine and treated by 'purgation therapy' when it is classified into excessive syndrome. We observed some significant improvements in the cognitive function from three patients diagnosed vascular dementia and secondary dementia by herbal medications of $\ulcorner$Dong-Eui-Su-Sheh-Bo-Won(東醫壽世保元)$\lrcorner$. We report the process of the treatment.

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Phytochemical Constituents of the Root Bark from Morus alba and Their Il-6 Inhibitory Activity

  • Chang, Young-Su;Jin, Hong-Guang;Lee, Hwan;Lee, Dong-Sung;Woo, Eun-Rhan
    • Natural Product Sciences
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    • v.25 no.3
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    • pp.268-274
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    • 2019
  • Morus alba L., known as white mulberry, is a medicinal plant belongs to family Moraceae. It has long been used commonly in Ayurvedic for the treatment of lung-heat, cough, asthma, hematemesis, dropsy and hypertension. In the present study, seven prenylated flavonoids, along with four benzofuran compounds were isolated by means of repeated column chromatography. The structures of the known compounds were identified as kuwanon G (1), kuwanon E (2), kuwanon T (3), morusin (4), sanggenon A (5), sanggenon M (6), sanggenol A (7), moracin R (8), mulberofuran G (9), mulberofuran A (10) and mulberofuran B (11), by comparing their spectroscopic data with those reported in the literature. For these isolates, containing trace compounds, the inhibitory activity against IL-6 production in $TNF-{\alpha}$ stimulated MG-63 cells was examined. All isolated compounds (1 - 11) showed excellent inhibitory activity against IL-6 production in $TNF-{\alpha}$ stimulated MG-63 cells. Especially this study is first time to report that sanggenon A (5), sanggenon M (6), sanggenol A (7), mulberofuran G (9), mulberofuran A (10) and mulberofuran B (11) showed the inhibitory activity of IL-6 production. Our study suggested the possibility of anti-inflammatory regulation by compounds (1 - 11) isolated from M. alba.

Stability Estimation of NATM Tunnel due to Excavation using Back Analysis (역해석기법을 통한 NATM 터널의 안정성 평가)

  • Lee, Jae-Ho;Kim, Young-Su;Jin, Guang-Ril;Park, Jin-Kyu;Park, Si-Hyun;Choi, Chil-Yong
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.494-504
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    • 2008
  • Successful design, construction and maintenance of NATM tunnel demands prediction, control, stability estimation and monitoring of surface settlement, gradient and ground displacement with high accuracy. Back analysis using measured data and forward analysis have been and are indispensable tools to achieve this goal. Sakurai provided the hazard warning levels for assessing the stability of tunnels using the relation of critical strain and apparent Young's modulus. This paper performed the estimation of tunnel stability on construction. Firstly, the apparent Young's modulus concept and back analysis method is introduced for the assessment of tunnel safety during excavation a brief framework. Secondly, this paper deals with case study using "Apparent Young's modulus" and "Back analysis" for the purpose of estimating the stability of NATM tunnel in Korea. Finally, a general method that can be estimated the tunnel stability discussed by a flow chart.

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Experiments Study on Critical Strain Properties of Sedimentary Rocks (실험적 연구를 통한 퇴적암의 한계변형률 특성에 관한 연구)

  • Lee, Jae-Ho;Kim, Young-Su;Jin, Guang-Ril;Park, Jang-Ho;Park, Si-Hyun
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.211-219
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    • 2008
  • The hazard warning levels are necessary for the rational design and safety construction of underground space, as mountain and urban tunnel. Sakurai provided the hazard warning levels for assessing the stability of tunnels using the critical strain of rock mass, which is defined as a ratio between uni-axial compressive strength and the Young's modulus. The concept of critical strain guidelines is introduced in this study for the assessment of tunnel safety during excavation. Moreover, in this paper, the critical strain properties of sedimentary rock in Korea has investigated and analysed in detail by Lab. test, as the uniaxial compression tests. Finally, critical strain properties of sedimentary rock is discussed the relationship of failure strain values, uniaxial compression strengths and Young's modulus.

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