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권용남(Yong-Nam Kwon),김남용(N. Y. Kim),김국주(K. J. Kim),이진모(J. M. Lee),이영선(Y. S. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
본 연구에서는 대형단조품 열간단조에 미치는 단보지의 영향을 조사하기 위하여 실제 실험과 유한요소해석을 실시하였다. 본 연구에서 수행한 열간단조 조건내에서는 열간단조비의 영향이 크게 발생하지 않는 것을 확인할 수 있었다. 이와 함께 서영 및 냉각공정의 해석을 통하여 실제 단조품의 미세조직을 예측하는데 활용할 수 있음을 확인하였다. Hot forging characteristics of S355NL steel for wind mill parts have been studied in the present study. Firstly, three different sized billets were prepared and forged at the temperature of 1250℃. Forged microstructure as well as mechanical properties was characterized to verify the effect of forging ratio. Also, a conventional finite element analysis consisting of both forging and cooling of forged billets was carried out to simulate forged part’s microstructure numerically. These data were compared with thermodynamic calculation results in the end.
Terahertz conductivity of reduced graphene oxide films.
Hong, J T,Lee, K M,Son, B H,Park, S J,Park, D J,Park, Ji-Yong,Lee, Soonil,Ahn, Y H Optical Society of America 2013 Optics express Vol.21 No.6
<P>We performed time-domain terahertz (THz) spectroscopy on reduced graphene oxide (rGO) network films coated on quartz substrates from dispersion solutions by spraying method. The rGO network films demonstrate high conductivity of about 900 S/cm in the THz frequency range after a high temperature reduction process. The frequency-dependent conductivities and the refractive indexes of the rGO films have been obtained and analyzed with respect to the Drude free-electron model, which is characterized by large scattering rate. Finally, we demonstrate that the THz conductivities can be manipulated by controlling the reduction process, which correlates well with the DC conductivity above the percolation limit.</P>
衝擊波動 重疊原理에 의한 耐衝擊性 3重壁構造 Polymer
申容珍,崔勝平,梁京承,白昌鉉 朝鮮大學校 自然科學硏究所 1995 自然科學硏究 Vol.18 No.1
In thermoplasticity polymer, mean molecular weight and molecular weight distribution are the important factors which effect the physical property. If impact strength(I.S-) is high, tensile strength(T.S.) and flating weight(F.W-) are low. Because of the reciprocal relation I.S. and T.S. there set a limit to satisfy I.S. and T.S. in single matter at the same time. Applying the superposition principle to the polymer, extemal impact wave pulse on the 3-1ayered stmcture may be changed to the transmitted wave and reflected wave, and then separated waves lose the mechanical energy to the S-layered structure which contains different molecular weight. There is the dispersion and attenuation of the impact energy, hence at the low temperature impact strength and tensile strength synchronously are high.
왕겨에 의한 신령버섯균사체 액체배양액의 생쥐 항복수암성 증가
Young S. Kim(김영숙),Wook J. Jang(장욱진),Md. A. Rakib(라키브),Jung M. Kwon(권정민),Chae R. Ahn(안채린),So Y. Kim(김소영),Yong U. Cho(조용운),Young K. Ha(하영권),Jeong O. Kim(김정옥),Yeong L. Ha(하영래) 한국생명과학회 2010 생명과학회지 Vol.20 No.9
왕겨가 Agaricus blazei Murill (AB: 신령버섯)균사체 액체배양 추출물의 항암성을 증가시키는지에 관한 연구를 수행하였다. AB균사체를 대두박을 기본으로 한 액체배지에 다양한 조건으로 배양하여, β-glucan 함량, Brix, 균사체를 측정하여 적정 생육조건을 선정하고, 이들의 열수추출물의 S-180 cell로 유도한 mouse 복수암에 대한 항암성을 조사하였다. AB균사체는 25℃에서 5일간 배양하였을 때 최적 생육을 나타내었고, 이 배양물이 다른 조건에서 배양한 배양물보다 우수한 항암성을 나타내었다. AB균사체의 생육 및 항암성은 변온배양에 따른 효과는 없었다. 따라서 이 최적배양조건(25℃, 5일 배양)에서 AB균사체를 1% 왕겨분말이 함유된 액체배지에 배양하고, 이의 열수 추출물의 항암성을 검증하였다. 1% 왕겨가 함유된 액체배지에서 배양한 열수추출물의 항암성은 왕겨가 함유되지 않은 배지의 열수추출물보다 항암성이 유의성 있게 증가되었다(p<0.05). 왕겨의 첨가는 AB균사체의 생육을 오히려 촉진시켰다. 이 결과는 왕겨가 AB균사체 뿐 만 아니라 다른 버섯균사체 액체배양물의 항암성 증진을 위한 원료로 활용될 수 있을 것임을 의미한다. The effects of rice hull (RH) powder on the anticarcinogenic activity of submerged-liquid cultures of Agaricus blazei Murill (AB) were assessed for mouse ascites cancers induced by mouse Sarcoma S-180 (S-180) cancer cells. Optimal growth of AB mycelia in the basal liquid culture medium, containing soybean meal, was achieved by culturing at 25℃ for 5 days, when evaluated by β-glucan content, Brix, and mycelial weight, relative to other culture conditions. Hot-water extract (HWE) of the submergedliquid culture of AB mycelia grown at 25℃ for 5 days exhibited a stronger anticarcinogenic activity, relative to HWE from other culture conditions. No such effects were obtained from AB mycelial cultures by alternative temperature-controlling cultures. Both cytotoxicity for S-180 cells and anticarcinogenic potentials for mouse ascites cancer of the HWE from AB mycelia grown in the basal medium containing 1% RH powder for 5 days at 25℃ were significantly (p<0.05) enhanced, relative to HWE from the AB mycelia culture of the basal medium without RH powder. These results indicate that HWE of submerged-liquid culture of AB mycelia, incubated in media containing 1% RH powder at 25℃ for 5 days, enhanced anticarcinogenic activity against S-180 cell-induced mouse ascites cancer, and suggest that RH powder is an excellent ingredient for the improvement of the anticarcinogenic potentials of the submerged-liquid culture of mushroom mycelia.
Physiological responses and effective selection criteria of drought tolerant plants
Park, D.J.,Im, H.J.,Kim, H.G.,Yang, W.H.,Yong, S.H.,Choi, M.S. Triveni Enterprises 2018 Journal of environmental biology Vol.39 No.4
<P>Interpretation : The results revealed that S. scilloides, C. communis, H. fulva. B. latissimum, H. plantaginea and I. dichotoma were screened as drought tolerant plants and the established method in the study can be applied to screen drought tolerant plants for Korean natives.</P>