• 한국주조공학회지
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• 제10권1호
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• pp.57-63
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• 1990

Continuous casting of the $Al-CuAl_2$ eutectic composite was carried out by the upward continuous casting process. The morphology of the eutectic growth and the stability of solid-liquid interface were investigated under various growth conditions. It was possible to get the planar solid-liquid interface at the condition of $G_L/R$＝$3.6{\times}10^3^{\circ}Csec/mm^2$. And the colony structures were formed at the conditions of $G_L/R$ < $R=0.33{\times}10^3^{\circ}Csec/mm^2$. The inter-lamellar spacing of $Al-CuAl_2$ eutectic composite was decreased with the increase of pulling speed. The reduction of inter-lamellar spacing & value of $G_L/R$ caused the increase of ultimate tensile strength and Rockwell hardness in $Al-CuAl_2$ eutectic composite.

• 한국주조공학회지
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• 제10권1호
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• pp.50-56
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• 1990

Continuous casting of the $Al-Al_3Ni$: eutectic composite was carried out by the upward continuous casting process. The morphology of the eutectic growth and the stability of solid-liquid interface were investigated under various growth conditions in an upward continuous casting. The effect of growth conditions on the mechanical properties of the $Al-Al_3$ Ni eutectic composit was also investigated, and the results were compared with those by the Bridgman method. As for the results, it was possible to get the planar solid-liquid interface at the condition of $G_L/R$＝$1.04{\times}10^3^{\circ}Csec/mm^2$. And the inter-rod spacing of $Al-Al_3Ni$ eutectic composite was decreased with the increase of pulling speed. The reduction of inter-rod spacing & value of $G_L/R$ caused the increase of ultimate tensile strength in $Al-Al_3Ni$: eutectic composite. The ultimate tensile strengths of $Al-Al_3Ni$ by the upward continuous casting were higher then those by the Bridgman method.

• Molecular & Cellular Toxicology
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• 제1권2호
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• pp.87-91
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• 2005

Although 2D-PAGE has been widely used as the primary method for protein separation, difficulties in displaying proteins with an extreme values of isoelectric paint (pI), molecular size and hydrophobicity limit the technique. In addition, time consuming steps involving protein transfer and extraction from the gel-pieces can result in sample loss. Here, we describe a novel protein separation technique with capillary size-exclusion chromatography (CSEC) for rapid protein identification from human plasma. The method includes protein fractionation along with molecular size followed by in-solution tryptic digestion and peptide analysis through reversed phase liquid chromatography (RPLC) coupled to nanoflow electrospray-tandem mass spectrometry (ESI-MS/MS). Tryptic peptides are applied an a $100\;{\mu}m\;i.d.{\times}10mm$ length pre-column and then separated on a $75\;{\mu}m{\times}200mm$ analytical column at -100 nL/min flaw rate. Proteins were identified over the wide ranges of pI (3.7-12.3) when this technique was applied to the analysis of $1-2\;{\mu}L$ of human plasma. This gel-free system provides fast fractionation and may be considered a complementary technique to SDS-PAGE in proteomics.

• 정보보호학회논문지
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• 제28권1호
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• pp.249-267
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• 2018

미국의 사이버보안 인력양성 정책은 2010년 시작된 NICE를 중심으로 포괄적이고 체계적으로 추진되고 있다. 기존 과학 기술 공학 수학(STEM) 전문인력 양성 정책의 일환인 국가과학재단(NSF)의 첨단기술교육(ATE) 8개 분야 중 하나인 보안기술(Security Technologies)에서 사이버보안 인력양성 프로그램을 운영 중이다. 이 보안기술 분야는 NICE와 연계하여 추진되고 있으며, 5종의 세부 프로그램으로 구성된다. 본 논문은 ATE에서 지원하는 사이버보안 인력양성 프로그램 5종에 대해 세부적으로 살펴보고, 이 프로그램들과 유사한 우리나라의 정부지원 프로그램을 상호 비교하여 개선점을 도출한 후, 국가차원의 신규 사이버보안 인력양성에 대한 추진 방향을 제안한다. 이때 적용된 방법론을 체계적으로 정리한 사이버보안 인력양성 정책 평가 프레임워크를 새로운 인력양성 정책 수립시 적용할 수 있도록 제안한다.