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On-line Screening HPLC-ABTS<sup>+</sup> Assay을 이용한 산청목으로부터 Salidroside의 분리 및 생물활성 분석
이광진,송나영,마진열,Lee, Kwang Jin,Song, Na-Young,Ma, Jin Yeul 한국생물공학회 2014 KSBB Journal Vol.29 No.2
Acer tegmentosum was a traditional Korean herbal medicine showing various pharmacological activities. In this work, A. tegmentosum were extracted with boiling water and then successively partitioned with dichloromethane, ethyl acetate, n-butyl alcohol (n-BuOH), and water. Salidoside, the target compound, was purified in n-BuOH phase using a chromatography method. For the analysis of salidoside, TLC and LC-MS were used as well as on-line screening $HPLC-ABTS^+$ assay with three different wavelength of 254, 280, and 320 nm. An amount of 1.34 g of salidoside were obtained in n-BuOH phase fromAcer tegmentosum was a traditional Korean herbal medicine showing various pharmacological activities. In this work, A. tegmentosum were extracted with boiling water and then successively partitioned with dichloromethane, ethyl acetate, n-butyl alcohol (n-BuOH), and water. Salidoside, the target compound, was purified in n-BuOH phase using a chromatography method. For the analysis of salidoside, TLC and LC-MS were used as well as online screening $HPLC-ABTS^+$ assay with three different wavelength of 254, 280, and 320 nm. An amount of 1.34 g of salidoside were obtained in n-BuOH phase from 3 kg of dry biomass. The on-line screening $HPLC-ABTS^+$ assay is rapid and efficient tool to search bioactivity from A. tegmentosum. 3 kg of dry biomass. The on-line screening $HPLC-ABTS^+$ assay is rapid and efficient tool to search bioactivity from A. tegmentosum.
A6061-T6/AZ31 이종금속 마찰교반접합부의 기계적 특성에 미치는 툴 삽입 위치의 영향
이광진,김상혁,Lee, Kwang-Jin,Kim, Sang-Hyuk 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.5
Butt-joints of A6061-T6 and AZ31 plates were successfully manufactured by using a friction stir welding method. Off-set free joints and off-set joints were fabricated to investigate the effect of the tool plunge position on the mechanical properties of the joints. Hardness test, tensile test and charpy impact test was performed to evaluate the mechanical properties of the joints. Off-set condition resulted in increase of mechanical properties of the joints. The variation of the hardness distribution in the SZ was also stabilized in the off-set condition. Tensile strength of the off-set joint was about 85% against to that of the AZ31 base metal. Impact absorption energy by Charpy-Impact-Test of the off-set joint also increased by almost 2 times against to that of the AZ31 base metal.
이광진,김상혁,권의표,손규송,Lee, Kwang-Jin,Kim, Sang-Hyuk,Kwon, Eui-Pyo,Son, Kyu-Song 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.2
Friction stir welding (FSW) was successfully performed about 900MPa grade Twinning Induced Plastisity (TWIP) steel. A PCBN tool with convex-type shoulder was applied. Optimal process conditions were deduced. Microstructure and mechanical properties such as hardness, tensile strength and impact absorbed energy were observed and evaluated, respectively. An optical microscope (OM) and a field emission scanning electron microscope (FE-SEM) was selected for observing the grain structure.
Al-Mg-Si계 알루미늄 합금 판재 마찰교반접합부의 결정 방위 분포에 대한 용접후열처리의 영향
이광진,Lee, Kwang-Jin 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.6
Friction stir welding (FSW) was carried out for Al-Mg-Si series aluminum alloys which are being used for automotive body structure. Consequently, Post weld heat treatment (PWHT) was applied to the friction stir welds to evaluate the effect of the paint baking process which is one of the automotive fabrication process on friction stir welded zone (FSWZ) in 443K for 1.2Ks. Grain structure and its crystal orientation distribution was measured about both the as welded specimens and the post weld heat treated specimens. An optical microscope (OM) and an field emission scanning electron microscope (FE-SEM) was used for observing the grain structure and measuring its crystal orientation distribution, respectively. Changes on the grain structure and its crystal orientation distribution were not detected. From the present results, it was confirmed that the paint baking process after FSW do not affect on the grain structure and its crystal orientation distribution of FSWZ. The comprehensive investigations will be performed for various automotive aluminum alloys manufactured by different processes, in the future.
이광진,김형자,Kwang-Jin, Lee,Hyung-Ja, Kim 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3
The sub-surface stress field beneath the spur gear's contact surface in lubricated condition has been analysed. The surface pressure was obtained by the elasto-hydrodynamic lubrication analysis using the accurate geometric clearances around the contact region of the teeth. The sub-surface stress field was calculated by using the Love's rectangular patch solution. The analysis results show that the sub-surface stress distribution is quite dependent on the surface pressure distribution. The pattern of sub-surface stress field is similar to that of the external load. The depth where the maximum effective stress occurs is not proportional to the intensity of the external load.
마찰교반용접(FSW) 및 마찰교반처리(FSP)의 최신 연구개발 동향
이광진,Lee, Kwang-Jin 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.2
The latest research & development trend on friction stir welding and friction stir processing technologies presented in the international symposium, 'Friction Stir Welding & Processing VII'. Papers and presentations about high temperature materials such as advanced high strength steel, stainless steel and titanum alloy shoot up this year. Papers on modeling of metal flow and control of process parameters also increased. The FSP technologies for manufacturing of carbon materials reinforced metal matrix composites were reported, too.
파트릭 모디아노의 근작에 나타나는 근원적 장면과 그 변주
이광진 ( Kwang Jin Lee ) 한국프랑스어문교육학회 2016 프랑스어문교육 Vol.55 No.-
Les oeuvres de Patrick Modiano nous démontrent plusieurs versions de la scène à la fois réelle et fantasmatique. La première relève de la ‘scène originaire’ qui désigne une scène fantasmatique dans laquelle le sujet est témoin du coït de ses parents. Du point de vue psychanalytique, il s'agit d'une scène dans laquelle l'enfant, ignorant ce qui se passe devant lui, ne voit pas l'affection dans la sexualité, mais l'obscénité dans l'action. Le je modianien, personnage principal de Modiano, prétend d'être le témoin de Paris nocturne et tient à interpréter la scène mystérieuse et à la représenter, à plusieurs reprises, comme une scène dramatique. La deuxième version renvoie à la ‘scène à l'origine’ qui nous semble spécifiquement modianien. Cette scène intéresse l'Histoire du père et de sa génération : le je modianien travaille sur un épisode de l'arrêt de son père pendant l'Occupation, c'est-à-dire avant sa naissance. Par ailleurs, c'est à cet épisode que toute scène importante prend naissance. Le je modianien raconte cette histoire en employant quelques élélments du contenu latent de la scène originaire : l'événement mystérieux, une pièce enfermée, un homme et une femme, le sujet qui les regarde, etc. Nous saisissons ici une certaine culpabilité chez le je modianien : ce sentiment immotivé en apparence se lie à une responsabilité à propos de l'Histoire. Nous découvrons ainsi la troisième version de la scène concernant la mémoire à laquelle le je modianien s'applique. Le je s'occupe à représenter le souvenir à propos de son père et de la génération de celui-ci : non seulement il devient le témoin de la scène, mais aussi il tente de faire partie de la mémoire passée : tantôt il participe à jouer le rôle du personnage, tantôt il la met en scène, à son tour, d'une manière fantasmatique et dramatique. Afin d'interpréter l'élaboration secondaire dans ce processus, nous nous proposons à nommer cette scène comme le ‘souvenir-scène’ en empruntant le ‘souvenir-écran’, terme freudien.