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Cho, Sungmo,Kim, Jongyul,Kim, TaeJoo,Sato, Hirotaka,Huh, Ilkwon,Cho, Namchul Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.5
This paper demonstrates the possible nondestructive analysis of iron artifacts' metallurgical characteristics using neutron imaging. Ancient kingdoms of the Korean Peninsula used a direct smelting process for ore smelting and iron bloom production; however, the use of iron blooms was difficult because of their low strength and purity. For reinforcement, iron ingots were produced through refining and forge welding, which then underwent various processes to create different iron goods. To demonstrate the potential analysis using neutron imaging, while ensuring artifacts' safety, a sand iron ingot (SI-I) produced using ancient traditional iron making techniques and a sand iron knife (SI-K) made of SI-I were selected. SI-I was cut into 9 cm<sup>2</sup>, whereas the entirety of SI-K was preserved for analysis. SI-I was found to have an average grain size of 3 ㎛, with observed α-Fe (ferrite) and pearlite with a body-centered cubic (BCC) lattice structure. SI-K had a grain size of 1-3 ㎛, α-Ferrite on its backside, and martensite with a body-centered tetragonal (BCT) structure on its blade. Results show that the sample's metallurgical characteristics can be identified through neutron imaging only, without losing any part of the valuable artifacts, indicating applicability to cultural artifacts requiring complete preservation.
산업연관표를 이용한 철도 교통과 통신산업의 상호연관성 분석
조신형(CHO, Shin-Hyung),서영현(SEO, Young-Hyun),이성모(RHEE, Sungmo),고승영(KHO,Seung-Young) 대한교통학회 2017 대한교통학회 학술대회지 Vol.76 No.-
정보통신기술의 혁신적인 발전은 교통서비스의 질적 향상을 가져왔다. 이에 따라 통신의 발달이 교통 수요를 대체하는지, 오히려 더 발생시키는지에 대한 연구가 수행되어 왔으나 서비스적 측면에 집중되어 왔다. 그러나 교통 및 통신산업은 타산업의 중간재로서 더 많이 이용되며 그 산업적 연관성을 규명할 필요가 있다. 산업연관표는 산업간 내부 수요구조를 나타내므로 지역 내 산업간연관의 특징을 파악하는 데 유용하다. 따라서 이번 논문에서는 우리나라의 1975년부터 2005년까지 실측년도의 산업연관표의 교통 및 통신관련 항목들의 투입계수와 생산유발계수를 Spearman 상관관계로 분석하여 향후 교통정책측면에서 두 산업의 발전방향을 모색해 보고자 한다.
Jeon, Bo-Young,Kim, Seung-Cheol,Je, Sungmo,Kwak, Jeongyeon,Cho, Jang-Eun,Woo, Jong-Tae,Seo, Sangkyo,Shim, Hang-Sub,Park, Byoung-Ok,Lee, Sung-Sik,Cho, Sang-Nae Elsevier 2010 Research in veterinary science Vol.88 No.3
<P><B>Abstract</B></P><P>An enzyme-linked immunosorbent assay (ELISA) using bulk tank milk samples was evaluated as a screening test for bovine tuberculosis (TB), a contagious chronic disease of cattle. An ELISA with MPB70, a major antigen of <I>Mycobacterium bovis</I> was performed using paired sets of milk and sera samples from 33 tuberculin-positive and 43 tuberculin-negative cattle. Anti-MPB70 antibodies were detected in milk samples and there was a significant correlation between seroreactivities of milk and sera samples (<I>R<SUP>2</SUP></I>=0.83). Using the tuberculin skin test as the reference test, the sensitivities of ELISA using milk and sera samples were 87.8% and 81.8%, respectively, and the specificities were 97.7% and 100%, respectively.</P><P>In the screening test using bulk tank milk samples from 931 dairy herds in Whasung, Gyeonggi-do, Korea, the positive rate for anti-MPB70 antibody was 4.5% (42/931) and the tuberculin-positive rate was 2.8% (26/931). Individual milk samples (<I>n</I>=253) were collected from randomly selected 8 problematic and 3 negative herds (positive and negative in the screening test by MPB70 ELISA using bulk tank milk samples, respectively) and tested by MPB70 milk ELISA. In the problematic herds, positive rates were 10.5% (20/190) for anti-MPB70 antibodies in milk ELISA and 2.1% (4/190) in the tuberculin skin test. More than one dairy cows were positive by milk ELISA among the problematic herds, and all tuberculin-positive dairy cows were positive in the milk ELISA. Further, no positive cows were detected in negative herds both by milk ELISA and tuberculin skin test. These results suggest that an ELISA, using bulk tank milk samples, might be a potential efficient screening test for bovine TB of dairy cows.</P>