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1
울산지역 건강인에서의 C 형 간염 항체 양성율

정지인(Ji Inn Jung),손석호(Suk Ho Sohn),조욱현(Wook Hyun Cho),정정희(Jung Hee Jung),김용림(Yong Lim Kim),이진관(Jin Kwan Lee) 대한내과학회 1993 대한내과학회지 Vol.45 No.3
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N/A Background: The prevalence of antibody to hepatitis C virus (anti-HCV) in healthy subjects from Korean has been investigated in various studies. But most of these studies were estimated from data in blood donors who were mostly young adults. So these studies could not represent the prevalence of anti-HCU in all age groups and its age distribution. Method: The prevalence of anti-HCV among healthy subjects in Ulsan area was evaluated using commercially available enzyme immunoassay. We studied a correlation between anti-HCV and alanine aminotransferase (ALT) level, and between anti-HCV and HBs Ag. Effects of increasing age and blood transfusion were also evaluated. Results: 1) The overall prevalence of anti-HCV was 1.079 among 3,000 healty subjects. 2) Male to female ratio was 2.5:1. The prevalence of anti-HCV among male subjects (1.21%) was higher than that among female subjects (0.7%). 3) Anti-HCV prevalence increased with increasing age through the fourth decade of life. 4) There was no significant difference both in the prevalence of anti-HCV in healthy subjects with or without HBs Ag and in the prevalence of anti-HCV in healthy subjects with or without the history of transfusion. 5) Anti-HCV prevalence increased linearly with the increase of alanine aminotransferase level. Conclusion: The prevalence of anti-HCV in healthy subjects in Ulsan area was 1.07%. There was a significant increase with increasing age above 30 years. There was a good correlation between the prevalence of anti- HCV and ALT level, but the prevalence of anti-HCV was not associated with blood transfusion.
2
EDLC 전극용 카본에어로젤의 합성조건에 따른 기공구조 및 전기화학적 특성

서혜인,정지철,김명수,Seo, Hye Inn,Jung, Ji Chul,Kim, Myung-Soo 한국재료학회 2018 한국재료학회지 Vol.28 No.1
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  ScienceON
  
  코리아스칼라
Various carbon aerogels (CAs) were prepared from polymerization of resorcinol and formaldehyde and applied as the electrode materials of an electric double layer capacitor (EDLC) with the aim of controlling the textural and electrochemical properties of CAs by the type of base catalyst and the ratio of resorcinol to catalyst (R/C). The CAs from $NaHCO_3$ and $KHCO_3$ with $H^+$ ions had higher specific surface areas but exhibited lower electrochemical properties than those from $K_2CO_3$ and $Na_2CO_3$, which had more uniform pore size distributions. The electrochemical properties of $Na_2CO_3$ were superior to those of $K_2CO_3$ probably because the polarizing power of $Na^+$ ions was higher than $K^+$ ions. With an increasing R/C ratio, the pore sizes of CA showed a tendency to increase but the uniformity of the pore size distribution got worse. For the four base catalysts, the highest electrochemical property was obtained at the R/C ratio of 500.
3
KOH와 CO₂ 활성화에 의한 카본에어로젤의 기공특성 및 EDLC 전극재로서의 전기화학적 특성

서혜인(Hae Inn Seo),김상길(Sang-Gil Kim),정지철(Ji Chul Jung),김명수(Myung-Soo Kim) 한국고분자학회 2016 폴리머 Vol.40 No.4
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카본에어로젤(CA)의 KOH와 CO₂ 활성화를 진행하여 기공특성 및 전기화학적 특성에 끼치는 영향을 조사하였다. KOH로 활성된 CA는 높은 비표면적과 높은 EDLC 전극 비용량을 나타냈지만, 미세기공보다 중기공이 더 발달하였고, 고전류에서 상대적으로 비용량의 감소폭이 크며, 활성화과정에서 결정성을 대부분 잃어버려 전기전도도가 낮았다. 한편, CO₂ 활성화된 CA는 KOH 활성화된 CA에 비해 1/2 수준의 비표면적을 갖지만, 80% 전후의 비용량을 나타냈다. CO₂ 활성화된 CA의 기공분포는 1 nm 근처의 미세기공이 상대적으로 더 많이 발달하였고, 적절한 기공구조로 인해 고전류에서 용량의 감소폭이 상대적으로 작았으며, 활성화 후 결정성을 유지하여 전기전도도가 상대적으로 높았다. CO₂ 활성된 CA의 전기화학적 특성을 향상시키기 위해 활성화온도를 850에서 1000 ℃로 변화하였을 때, 활성화온도의 증가에 따라서 비표면적과 비용량이 증가하였다. 하지만, 활성화수율 및 단위면적당 비용량을 고려하여 최적의 활성화온도는 950 ℃로 결정하였다. A resorcinol-formaldehyde (RF) carbon aerogel (CA) was activated with KOH and CO₂. The effect of KOH and CO₂ activation on the textural properties and the electrochemical properties of CA was investigated. The KOH activated carbon aerogel (KOHACA) had higher specific surface area and specific capacitance as an electric-double-layercapacitor (EDLC) electrode than the CO₂ activated carbon aerogel (COACA), but the COACA exhibited better electrochemical performance at a high current than the KOHACA. The COACA had more uniform pore structure of around 1 nm and higher electrical conductivity due to increased micro-crystallinity as compared to the KOHACA. As the activation temperature increased in the range of 850~1000 ℃, the specific surface area and specific capacitance per mass of COACA increased. However, the optimal activation temperature was determined as 950 ℃ considering activation yield and specific capacitance per area.