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Hwang, SeungKuk,Lee, Sangpill,Lee, Jinkyung,Bae, Dongsu,Lee, Moonhee,Nam, Seunghoon The Korean Society of Industry Convergence 2019 한국산업융합학회 논문집 Vol.22 No.1
This study dealt with the tensile strength characteristics of stainless steel 304L steel by hydrogen charging. Especially, the effect of hydrogen charging time on the tensile strength and ductility of 304L stainless steels was evaluated, in conjunction with the observation of their fracture surfaces. The tensile properties of hydrogen-charged 304L stainless steels were also investigated with the variation of tensile loading speeds. The hydrogen amount of 304L stainless steels obviously increased with the increase of hydrogen charging time. The tensile properties of 304L stainless steels were clearly affected by the short term charging of hydrogen. In particular, the elongation of 304L stainless steels decreased with increasing hydrogen charging time, due to the hydrogen embrittlement. It was also found that the tensile properties of hydrogen-charged 304L stainless steels were very sensitive to the crosshead speed for tensile loading.
Eunjeong Choi,Seungkuk Bae,김동현,Gi Hoon Yang,이경호,유희진,강효진,곽소정,안상현,전호준 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Various approaches have been made to successfully regenerate tissues or organs. One approach is todesign a bioengineered scaffold which simulate the native environment of tissues and organs. This studyexamined the efficacy of a PCL basedfibrous scaffold embedded with decellularized bone extracellularmatrix (bdECM) fabricated using electrospinning process. Electrospunfibers are known to mimic thestructure of the natural ECM, while bdECM can provide a rich environment for the human mesenchymalstem cells to adhere and differentiate. We found that the bdECM particles strongly influenced the surfacecharacteristics of the fabricated scaffolds such as wettability, water uptake ability, and surface roughness. Also, the cell adhesion depending on the bdECM content was studied in depth. As a result, increasedbdECM content in the scaffold showed enhanced cell adhesion and proliferation. Moreover, the ALPactivity, calcium deposition, and gene expression results indicate that the bdECM particles had significanteffect on osteogenic differentiation. In the present study, the feasibility of the bdECM/PCL scaffold wasdemonstrated which can be used as a potential biomedical device for hard tissue regeneration.