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Lei Gao,Feng Li,Ye Wang,Xing Mao Xiao,Peng Da Huo 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
Solid-state bonding of heterogeneous materials is one of the effective ways to achieve light weight. An extrusion formingprocess for Mg/Al thickness-oriented bonding sheet was carried out. Due to triaxial compressive stress in the extrusion container,the AZ31 and AA6061 billets were deformed and the bonding and forming of Mg/Al thickness-oriented sheet can berealized by this method. The observation results of the bonding position by using XRD, SEM and EDS showed that: at theforming temperature with 360–420 °C, it had a good bonding interface, and the width of the transition layer increased withthe increase of the forming temperature. The presence of brittle intermetallic compounds in the transition layer indicated thatmetallurgical bonding had occurred at the interface. Considering all factors comprehensively, when the forming temperaturewas 390 °C, the bonding quality was appropriate. Its tensile-shear strength was 42 MPa, the width of the interface transitionlayer was about 10 μm, and the microhardness was about 164.3 HV. This method provided scientific guidance and technicalreserves for green forming of Mg/Al sheets.
( Da Lei Yao ),( Chang Hao Zhang ),( Jie Luo ),( Mei Jin ),( Ming Shan Zheng ),( Jiong Mo Cui ),( Jong Keun Son ),( Gao Li ) 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
Two new (1 and 3) two known diarylhep-tanoids (2 and 4), along with two tetralones (5 and 6), one naphthoquinone (7), four phenylpropanoids (8-11), and phenol (12) were isolated from the leaves of Juglans mandshurica. Their structures were elucidated on the basis of spectral and chemical data. Compounds 2 and 10 are firstly isolated from this plant and 8 and 12 were isolated from the Juglans genus for the first time. Among these compounds, only 7 cxhibitcd moderate cytotoxicities against cultured Mgc-803, A549, K562, and Hela tumor cell lines with IC50 values of 25.90, 28.60, 39.06, 44.90 LLM, respectively.
Lei Xu,Lei Xu,Wen-Da Wang,Jian-Gang Sun 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.4
The present study established a numerical investigation on the behavior of concrete filled steel tube reinforced concrete (CFSTRC) columns subjected to fire. A finite element analysis (FEA) model was built to simulate the performance of CFSTRC columns under combined loading and fire. The FEA model was verified by the experimental results of CFSTRC columns subjected to fire. The comparison demonstrated an acceptable accuracy for the proposed FEA model. Afterwards, the FEA model was used to analyze the failure modes, the redistribution of internal force, the changes and development of the stress and strain, and the contact stress between the tube and concrete of CFSTRC columns subjected to fire. Influencing factors that may affect the bearing capacity of the CFSTRC columns subjected to fire were analyzed. The bearing capacity and stiffness of the CFSTRC columns gradually decreased in the fire; the parameters such as the fire duration time, sectional dimension, slenderness ratio, and sectional core area ratio significantly influenced the bearing capacity of the CFSTRC columns. Finally, a simplified calculating formula was proposed to calculate the influence factors of the bearing capacity of the CFSTRC columns subjected to ISO-834 standard fire. The formula-calculated results were well in agreement with the finite element analysis results, which provide a simple and feasible method for evaluating the fire-resistance design of these types of components in practical engineering.
Chemical constituents from the leaves of Juglans mandshurica
Da Lei Yao,Chang Hao Zhang,Jie Luo,Mei Jin,Ming Shan Zheng,Jiong Mo Cui,손종근,Gao Li 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.4
Two new (1 and 3) and two known diarylheptanoids(2 and 4), along with two tetralones (5 and 6), onenaphthoquinone (7), four phenylpropanoids (8–11), andone phenol (12) were isolated from the leaves of Juglansmandshurica. Their structures were elucidated on the basisof spectral and chemical data. Compounds 2 and 10 arefirstly isolated from this plant and 8 and 12 were isolatedfrom the Juglans genus for the first time. Among thesecompounds, only 7 exhibited moderate cytotoxicitiesagainst cultured MGC-803, A549, K562, and HeLa tumorcell lines with IC50 values of 25.90, 28.60, 39.06,44.90 lM, respectively.
중국기업의 對한국 FDI 진입전략 및 성과인식에 관한 연구
이대뢰(Da-Lei Li),김성순(Seong-Suhn Kim) 한국경영사학회 2011 經營史學 Vol.60 No.-
본 연구는 더닝(Dunning)의 절충이론을 기반으로 중국기업의 對한국 FDI 성과 영향 요인을 분석․검증해 봄으로써 앞으로 對한국 FDI의 효과적인 진출전략 및 시사점을 제시하였다. 분석결과, 對한국 직접투자에 있어 단독투자 진입방식은 합작투자 진입방식에 비해 더 높은 성과를 나타냈다. 모기업의 국제화 경험과 인적자원 우위, 그리고 현지 자회사의 마케팅능력과 재무능력 등 기업내부 요인은 對한국 단독투자기업과 합작투자기업 성과에 모두 유의하게 정(+)의 영향을 미치는 결과를 얻었다. 또한 환경적 요인에서는 현지국 국가위험과 같은 불확실성 및 현지시장수요 등 변수는 對한국 해외직접투자 전체 표본기업과 단독투자기업 성과에 영향을 주며, 문화적 차이 변수만 합작투자기업 성과에 영향을 미치는 것으로 분석되었다. The purpose of this study is to empirically analyze the determinants of the per-formance of the Chinese Enterprises FDI in Korea. The results show that, in view of direct investments in Korea, wholly owned sub-sidiaries have shown much higher subsidiary performances than the joint venture corporations. In terms of internal factors such as the population’s global experience, human resource competence, local subsidiary’s marketing and financial capabilities, both the wholly owned subsidiaries and the joint venture corporations have recorded positive effects from the internal factors. Also, this research has shown that environ-mental factors such as uncertainty and local market demand brought about by country’s risk affect the performance of direct investments negatively of the wholly owned subsidiaries in Korea, while cultural variables would influence only the com-panies engaging in the joint venture corporations.
( Yao Da Lei ),( Zhang Chang Hao ),( Li Ren ),( Luo Jie ),( Jin Mei ),( Piao Jin Hua ),( Zheng Ming Shan ),( Cui Jiong Mo ),( Son Jong Keun ),( Li Gao ) 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
The present study was designed to isolate and characterize novel chemical constituents of the stem bark of Juglans mandshurica Maxim. (Juglandaceae).The chemical constituents were isolated and purified by various chromatographic techniques. The structures of the compounds were elucidated on the basis of spectral data (1D and 2D NMR, HR-ESI-MS, CD, UV, and IR) and by the comparisons of spectroscopic data with the reported values in the literatures. Two long chain polyunsaturated fatty acids (1 and 2) were obtained and identified as (S)-(8E, 10E)-12-hydroxy-7-oxo-8, 10-octadecadienoic acid (1) and (S)-(8E, 10E)-12-hydroxy-7-oxo-8,10-octadecadienoic acid methyl ester (2). To the best of our knowledge, this is the first report on the isolation and structural elucidation of the two new conjugated ketonic fatty acids from this genus.
Meng, Ze-Da,Song, Da-Ye,Zhu, Lei,Park, Chong-Yeon,Choi, Jong-Geun,Oh, Won-Chun The Korean Ceramic Society 2011 한국세라믹학회지 Vol.48 No.4
ACF and $WO_3$ modified $TiO_2$ composites (ACF/$WO_3$/$TiO_2$) were prepared using a sol-gel method. The composites were characterized by Brunauer.Emmett.Teller (BET) surface area measurements, X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis and scanning electron microscope (SEM) analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. The degradation of the MO was determined using UV/Vis spectrophotometry. An increase in photocatalytic activity was observed and attributed to an increase of the photo-absorption effect by the $WO_3$ and the cooperative effect of the ACF.
Lei, Bo,Shin, Kwan-Ha,Noh, Da-Young,Jo, In-Hwan,Koh, Young-Hag,Choi, Won-Young,Kim, Hyoun-Ee The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.28
<P>We herein propose a novel way of producing nanofibrous gelatin–silica hybrid scaffolds through thermally induced phase-separation (TIPS) particularly using mixtures of gelatin solution and silica sol, which can mimic the physical structure, chemical composition, and eventually functions of the native bone extracellular matrix (ECM). The gelatin solutions were homogeneously hybridized with various contents of a silica sol using simple magnetic stirring, which enabled the construction of a nanofibrous structure with a uniform distribution of the silica in the gelatin nanofibers. The nanofibrous gelatin–silica hybrid scaffolds showed much better mechanical properties and <I>in vitro</I> biodegradation stability and apatite-forming ability than the nanofibrous pure gelatin scaffold, which were achieved by the presence of a stiff, bioactive silica phase in the nanofibers and the interaction between the silica hydroxyls and the amino group in the gelatin polymer. In addition, the nanofibrous gelatin–silica hybrid scaffold with a silica content of 30 wt% showed reasonably high <I>in vitro</I> biocompatibility. These findings suggest that the highly porous, nanofibrous hybrid structure mimicking the bone ECM can provide an excellent matrix for bone tissue regeneration.</P> <P>Graphic Abstract</P><P>We herein propose a novel way of producing nanofibrous gelatin–silica hybrid scaffolds through thermally induced phase-separation (TIPS) particularly using mixtures of gelatin solution and silica sol, which can mimic the physical structure, chemical composition, and eventually functions of the native bone extracellular matrix (ECM). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm31290e'> </P>
Lei Zhu,Ze-Da Meng,오원춘 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2
This paper reported a simple deposition–precipitation method, introducing the metal (Ni, Ag and Sn) and Na2S· 5H2O to preparedispersion metal sulfide nanoparticles on the surface of the Multi-walled carbon nanotube for synthesis of CNT-MxSy (NiS2, Ag2S, SnS) composite photocatalysts. The characterization of the prepared CNT-MxSy (NiS2, Ag2S, SnS) composites was performed by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis and BET analysis. Furthermore, the MB degradation rate constant for CNT-SnS composite was 5.68 × 10−3 under visible light irradiation, which was much higher than the corresponding values for other samples. The detailed formation and photocatalytic mechanism are also provided here.