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RISS 인기검색어
- 검색키워드
- 저자 : Dyuk-Yoon (검색결과 4 건)
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Electrodeposition Characteristics and Magnetic Properties of CoFeNi Thin Film Alloys
Song, Jae-Song,Yoon, Do-Young,Han, Choon,Kim, Dae-Heum,Park, Dyuk-Young,Myung, No-Sang The Korean Electrochemical Society 2002 한국전기화학회지 Vol.5 No.1
다양한 조성의 CoFeNi합금이 chloride bath와 sulfate bath에서 전해도금 되어졌고, 합금의 도금 특성과 자기특성이 관찰되어졌다. CoFeNi합금 박막의 전해도금에 있어서 Fe조성의 증가는 chloride bath에서보다 sulfate bath에서 빠르게 증가하였다. 전류효율은 큰 변화가 보이지 않는 chloride bath와 달리 sulfate bath에서는 $750\%$에서 $50\%$로 큰 폭으로 감소하였다. Co, Fe, Ni조성이 $80\%,\;10\%,\;10\%$되는 CoFeNi합금이 이번 실험에서 가장 우수한 연자성 재료로 평가되었으며, 그때의 Coercivity는 3 Oe이고 높은 squareness값을 보였다 Various compositions of CoFeNi alloys have been electrodeposited in chloride bath and in sulfate bath, and evaluated for electrodeposition characteristics and magnetic properties. For electrodeposited CoFeNi thin film alloys, the increase of Fe content in the deposits from sulfate bath was considerably faster than those from chloride bath. The current efficiencies in sulfate bath showed observable decrease from $75\%\;to\;50\%$ while those in chloride bath showed no significant decrease. From the low coercivity of 3 Oe in the minimum and the higher squarenesses of the alloys from sulfate bath than those from chloride bath, the alloy at Co, Fe, and Ni contents of $80wt.\%,\;10wt.\%,\;and\;10wt.\%$ can be considered to be the best CoFeNi alloy in this research for the soft magnetic material.
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Reticulocytosis in screen-printing workers exposed to 2-butoxyethanol and 2-ethoxyethanol
Seng-Ho Song,Seong-Kyu Kang,Won-Jun Choi,Kyeong Min Kwak,Dong-Hoon Lee,Dyuk-Yoon Kang,Sang-Ha Lee 대한직업환경의학회 2017 대한직업환경의학회지 Vol.29 No.-
Background: Studies on the hematologic toxicity of ethylene glycol ethers in humans are limited. Therefore, the aim of this study was to examine the association between exposure to solvents (containing 2-butoxyethanol and 2-ethoxyethanol) and hematological effects. Methods: Thirty-four screen-printing workers who were exposed to 2-butoxyethanol and 2-ethoxyethanol and 37 nonexposed clerical workers were selected using data from the health care facilities that provided regular health screening services. Student’s t-tests and Pearson’s chi-square tests were used to compare differences in hematological parameters between the exposed and the control groups. A multivariate analysis was performed using the multiple logistic regression models to adjust for other variables. Results: The chi-square test showed the reticulocyte percentages and corrected reticulocyte counts to be significantly higher in the exposed group. The t-tests showed a significant increase in white blood cell counts, reticulocyte percentages, and corrected reticulocyte count (i.e., reticulocyte index) in the exposed group, with p-values of 0.002, 0.004, and 0.002, respectively. Multivariate analysis showed the odds ratio for the corrected reticulocyte counts to be 16.30 for the exposed group, when compared with that of the control group. Conclusions: Exposure to 2-butoxyethanol and 2-ethoxyethanol was significantly associated with reticulocytosis, necessitating the implementation of preventive measures for workers prone to occupational exposure to ethylene glycol ethers.
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김경덕,강석표,홍성윤 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The natural aggregate will be used up within 10 years due to the great amount of consumption in making of construction materials. Regarding reservation of natural aggregate, the construction waste has to be recycled as one of important constituents of construction materials, typically, concrete. In mortar industry, the demand of fine aggregate is much heavier as industry developed. It is highly essential to think of application study using recycled fine aggregate. In this study, we investigated the effect on basic properties of screeding mortar when recycled fine aggregate is replaced. This study presents document in order to give an applicable guideline for the best use of recycled fine aggregate together with checking properties. We could find that screeding mortar properties is not much influenced by the existence of recycled fine aggregate because particle size distribution is well classified through manufacturing process. As a result, it is considered that application of recycled fine aggregate in dry mortar system is sufficient.
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콘크리트 표면성능개선에 의한 중성화억제방안에 관한 실험적 연구
강석표,김경덕,이병기,길배수,홍성윤,김무한 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Penetration of concrete by aggressive materials in solution may cause an undesirable effect on concrete durability, for instance when Ca(OH)₂ is being leached out or an attack by aggressive liquids takes place. In particular, carbonation occurs in concrete because the calcium bearing phases present are easily attacked by carbon dioxide and converted to calcium carbonate from surface of concrete, It has been known that the durability of reinforced concrete structure is concerned with the surface performance of concrete which affects on the carbonation occurred by invasion of CO₂ gas and the corrosion of steel bar occurred by O₂ In this paper, the effects of carbonation resistance by improvement of surface performance for concrete are investigated according to the accelerated carbonation test. It is believed that the carbonation resistance of concrete has been significantly improved by the application of penetrative hardening agent due to the formation of a dense surface.
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