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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,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.
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.
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.
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.
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.
이광진(Kwang-Jin Lee),김지훈(Ji-Hoon Kim),정용갑(Yong-Gahp Chung),조남경(Nam-Kyung Cho),한영민(Young-Min Han) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
엔진의 핵심요소인 연소기는 엔진의 추력을 발생시키는 장치로 우주발사체 개발 시 선행단계에서 개발되어야 한다. 이를 위해 연소기의 연소시험이 필요한데, 이 시험들로부터 연소기의 성능 및 신뢰도를 평가하게 된다. 이 시험들을 수행하기 위한 국내 시험설비의 구축은 외국 시험기관에 의존할 수 있는 문제점을 해소할 수 있을 것으로 기대한다. 그리고 이 설비는 연소기 개발 일정 단축과 비용 절감 효과에 영향을 줄 것으로 보이며, 더 나아가 국내 항공우주분야 관련 업체의 기반을 확대해 줄 것으로 사료된다. A combustion chamber, one of engine components, must be developed in precedent stage of space launch program. For this, hot-firing tests of combustion chamber are needed. The performance and reliability of the combustion chamber are evaluated in these tests. Construction of the domestic facility for conducting these tests is expected to relieve the problem of depending on the foreign agency. And this facility has an effect on shortening schedule and cost reduction of combustion chamber development. Futhermore, it is considered that the infrastructures of aerospace-related industries are expanded through building up the facility.
이광진(Kwang-Jin Lee),장용희(Yong-Hee Jang),권용진(Yong-Jin Kwon) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
최근 인터넷의 발달과 함께 인터넷 상에서의 데이터 보안에 대한 요구가 매우 증가되고 있다. 그래서 공개키 또는 비밀키 알고리즘을 사용하여 데이터 보안을 해결하고 있다. 대부분의 공개키 알고리즘은 모듈려 연산들을 기반으로 하고 있으며 이 중 복잡고가 가장 높은 모듈려 역승 연산은 모듈러 곱셈 연산을 반복 수행하여 계산된다. 그래서 모듈러 곱셈연산을 효율적으로 계산하기 위한 많은 방법들이 제안되어 왔으며 하드웨어 구현 시 속도와 효율성 문제로 몽고메리 솝셈기에 대한 연구가 주목을 받아 왔다. 현재 몽고메리 곱셈 알고리즘을 이용한 곱셈기는 대부분이 성능과 면적만을 고려한 구조로 보안성 향상을 위해 입력 데이터의 비트수 증가 시 곱셈기의 구조 변경이 요구도니다. 따라서 본 논문에서는 비트수 길이가 변하더라도 곱셈기 구조는 변함이 없는 GF(p)상에서의 Scalable한 몽고메리 곱셈기 구조를 제안한다. Scalable한 곱셈기의 구조는 FPGA와 같이 메모리를 포함하는 하드웨어 플랫폼에 적합하다.제안된 구조는 Xllinx FPGA를 이용하여 하드웨어로 구현하며 ModelSim Tool을 통해 기능 및 타이밍 시뮬레이션을 수행한다.