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경질양극산화를 실시한 Al5052합금의 내공식성에 미치는 ECAP의 영향
손인준(Injoon Son) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.4
The effect of equal channel angular pressing (ECAP) on the pitting corrosion resistance of hard anodized Al5052 alloy was investigated. The degree of internal stress generated in anodic oxide films during hard anodization was also evaluated with a strain gauge method. The pitting corrosion resistance of hard anodized Al5052 alloy was greatly decreased by ECAP. Cracks occurred in the anodic oxide film during hard anodization and these cracks were larger and deeper in the alloy with ECAP than without. The pitting corrosion was accelerated by cracks. The internal stress present in the anodic oxide films was compressive and the stress was higher in the alloys with ECAP than without, resulting in an increased likelihood of cracks. The pitting corrosion resistance of hard anodized Al5052 alloy was improved by annealing at the range of 473-573K after ECAP processed at room temperature for four passes. The compressive internal stress gradually decreased with increasing annealing temperature. It is assumed that the improvement in the pitting corrosion resistance of hard anodized Al5052 alloy by annealing may be attributed to a decrease in the likelihood of cracks due to the decreased internal stresses in anodic oxide films.
Minsoo Son,Hyunsoo Kim,Injoon Yeo,Yoseop Kim,Areum Sohn,Youngsoo Kim 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.2
Quantifying multiple protein biomarkers in a blood sample at one time has many advantages for diagnosing human diseases. In this study, 34 multiplex assays by multiple reaction monitoring-mass spectrometry (MRM-MS) for serum biomarkers were characterized according to Clinical Proteomic Tumor Analysis Consortium (CPTAC) guidelines. The assays revealed that the median lower limit of quantitation (LLOQ) was 0.37 fmol/μL (16.0 ng/mL) and that the median total coefficient of variation (CV) was 18.2%, 12.2%, and 10.6% in the low-, medium-, and high-quality control (QC) samples. With regard to selectivity, the median mean differences in slope and concentration were 2.1% and 4.3%, respectively. The median values for all CVs and %difference from the nominal concentration for stability were 9.5% and 2.7% in low-QC and 3.8% and 3.1% in medium-QC. The median total CV was 9.8% in the reproducibility. Finally, 17 protein-based biomarker assays were reliable and transferrable for preclinical purposes per CPTAC guidelines.
손인준,손호상,Son, Injoon,Sohn, Ho-Sang 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.3
백금족 금속(Platinum Group Metals, PGMs)은 화학적 저항성은 물론 전기·열전도성이 뛰어나 촉매, 전자기기, 전극, 전기기기, 연료전지, 고온 소재 등 광범위한 응용 분야에 사용된다. 일반적으로 백금족 금속은 구리와 니켈의 황화광과 관련되어 있으므로 백금족 금속의 상대적인 농도에 따라 주산물로 생산되거나 니켈과 구리의 부산물로 생산된다. 특히 이러한 자원들은 남아프리카와 러시아 같은 나라들에 편재되어 있으며, 백금족 금속의 연간 공급량은 500톤 미만이다. 이와 같은 백금족 금속의 한정된 공급량을 고려하면 향후에 백금족 금속의 공급 리스크가 증가할 것이다. 따라서 폐촉매와 같은 2차 자원으로부터 백금족 금속을 회수하는 것이 매우 중요하다. 본 논문에서는 백금족 금속의 제련 기술과 리사이클링 기술에 대하여 고찰하였다.
금 합금 도금층의 접촉저항에 미치는 합금원소의 종류 및 Thermal Aging의 영향
이지웅(Jiwoong Lee),손인준(Injoon Son) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.6
In this study, the effects of alloying elements and thermal aging on the contact resistance of electroplated gold alloy layers were investigated by surface analysis using X-ray photoelectron spectroscopy (XPS). The contact resistance of Au-Ag alloy was lower than that of Au-Ni or Au-Co alloy after thermal aging. The XPS results show that nickel and oxygen present as nickel oxides such as NiO and Ni₂O₃ on the surface of gold layers after thermal aging. The increase in the contact resistance after thermal aging is attributable to the nickel oxide layer formed on the surface of the gold layers. The content of nickel diffused from the underlayer during the thermal aging was high in the order of Au-Co, Au-Ni and Au-Ag alloy because the area of grain boundary was large in the order of Au-Ag, Au-Ni and Au-Co alloy.