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전기로 제강분진에 함유된 금속원소의 휘발거동에 대한 속도론적 연구
윤재홍,윤치현,이명원,Yoon, Jaehong,Yoon, Chihyun,Lee, Myungwon 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.3
전기로 제강분진은 고철을 전기로에서 용해하는 과정에서 발생하는 휘발성분들이 공기 중의 산소와 반응하여 산화물형태로 포집된 미세분말로써 다양한 특성을 가지고 있다. 이러한 전기로 제강분진의 효율적인 자원화를 위해서 반응속도론적 기초실험과 Pilot 규모의 생산실험을 병행하여 실시하였다. 그 결과 전기로 제강분진은 다양한 구성성분과 화합물로 구성되어 있었으며 공통적으로 Cl과 알카리 성분이 다량으로 존재함에 따라 자원화를 위한 실제 조업에 큰 악영향을 미치는 화합물의 형성이 예상된다. 휘발거동은 $1100^{\circ}C$ 영역에서 활발히 진행되고 $1250^{\circ}C$ 영역에서는 용융현상이 나타남을 확인할 수 있었다. 이러한 결과는 Pilot규모의 실증테스트의 결과로 얻은 조산화아연과 환원철의 형성거동에서도 동일한 결과를 얻었다. 이러한 결과는 전기로 제강분진의 자원화 플랜트의 설계 및 조업조건 설정에 유용한 기초자료로 활용이 기대된다. Electric arc furnace steelmaking dust has various physicochemical properties as volatile components generated in the melting process of steel scraps in an electric arc furnace, which is captured in oxide form as fine powder by reacting with oxygen in the air. In order to efficiently recycle these electric arc furnace dust, a kinetic basic experiment and a pilot production test were carried out in parallel. As a result, it was found that the electric arc furnace dust contain a large amount of Cl and alkali components, thus it was expected that the compounds have a great adverse effect on the actual operation for the recycling. It was confirmed that the volatilization behavior was progressing actively at $1100^{\circ}C$ and the electric arc furnace dust was melted at $1250^{\circ}C$. These results are the same as a result of pilot test for the formation behavior of zinc oxide and reduced iron. These results should be useful as basic data for designing the recycling plant of the electric arc furnace dust and establishing the operating conditions.
윤재홍,정용,신동천,이종태,Yoon, Jae-Hong,Chung, Yong,Shin, Dong-Chun,Lee, Jong-Tae 대한예방의학회 1999 Journal of Preventive Medicine and Public Health Vol.32 No.2
Objectio ostinato the carcinogenic risks from the ingestion of some carcinogenic pesticides (CPs) in vegetables sampled at a local agricultural product market in Seoul. Methods: After applying a hazard identification step, we selected four pesticides, such as DDT, dieldrin, folpet, and heptachlor epoxide, for this risk assessment. Concentrations of each pesticide were measured from randomly sampled vegetables. In order to estimate the human exposure levels, we combined the concentration of pesticides in the vegetables with consumption rate of those vegetables. Three scenarios were hypothesized for human exposure assessment. Scenario I was the most conservative which supposed the undetected CPs would be the detection limit values. Scenario II was assumed that the undetected CPs would be a half of the detection limit values, and finally scenario III merely considered only values greater than the detection limit values. We finally presented the estimated carcinogenic risks on the basis of the traditional risk assessment procedure suggested by U.S. EPA. Results: Pesticides including DDT, dieldrin, folpet and heptachlor epoxide were detected in 9 samples (6%) in the range of $0.0006\sim0.09ppm$. The daily intake levels of carcinogenic pesticides were estimated in the range of $0.0009\sim0.0079{\mu}g/day$. As we expected, excess cancer risks based on scenario I was also the highest $(1.1\times10^{-8}\sim5.5\times10^{-5})$. Conclusions: We found that the estimated risks from the pesticides we investigated were not serious. We, however, propose that a continuos monitoring is needed to make sure for the protection of public health.
입효산(立效散)의 Methicillin-Resistant Staphylococcus aureus에 대한 항균활성에 관한 연구
윤재홍,최연주,정승현,신길조,Yoon, Jae-Hong,Choi, Yeun-Ju,Jeong, Seung-Hyun,Shin, Gil-Cho 대한한방내과학회 2013 大韓韓方內科學會誌 Vol.34 No.3
Objectives : Methicillin-resistant Staphylococcus aureus (MRSA) has a cephalosporin and beta-lactam antibiotic-resistant strains. MRSA is one of the major pathogens causing hospital infection and the isolation ratio of MRSA has gradually increased. Consequently, increased resistance to antibiotics is causing serious problems in the world. Therefore, there is a need to develop alternative antimicrobial drugs for the treatment of infectious diseases. Methods : The antibacterial activities of Ipyo-san were evaluated against 2 strains of MRSA and 1 standard Methicillin-susceptible staphylococcus aureus (MSSA) strain by using the disc diffusion method, minimal inhibitory concentrations (MIC) assay, colorimetric assay using MTT test, checkerboard dilution test and time-kill assay performed under dark. Results : The MIC of Ipyo-san water extract against S. aureus strains ranged from 1000 to $2,000{\mu}g/ml$, so we confirmed that it had a strong antibacterial effect. Also, the combinations of Ipyo-san water extract and conventional antibiotics exhibited improved inhibition of MRSA with synergy effect. We suggest that Ipyo-san water extract against MRSA has antibacterial activity so it has potential as alternatives to antibiotic agents. For the combination test, we used Triton X-100 (TX) and DCCD for measurement of membrane permeability and inhibitor of ATPase. As a result, antimicrobial activity of Ipyo-san water extract was affected by the cell membrane. Conclusions : We suggest that the Ipyo-san water extract lead the treatment of bacterial infection to solve the resistance and remaining side-effect problems that are the major weak points of traditional antibiotics.
윤재홍(Yoon, Jae Hong),김순문(Kim, Soon Moon) 동아대학교 경영문제연구소 2010 經營論叢 Vol.31 No.-
The DBR(Drum-Buffer-Rope) approach of TOC(Theory of Constraints) is used to achieve the global optimization of unbalanced factory by focusing on the management of capacity constrained resources which restrict throughput of the production system. DBR has widely been recognized as an efficient tool to lower the stock level and to shorten the lead time by pursuing the whole profit rather than achieving a local efficiency. The satisfaction of due date is important competitiveness in the thruster factory which has the characteristics of the product variety and frequent order change. Thus, it is desirable to apply the DBR approach to the thruster factory in order to develop an efficient assembly production system for better productivity. This paper presents the DBR scheduling system for the thruster factory and to apply the DBR scheduling system to the thruster factory. Along this line, this study first introduces general steps of DBR scheduling system in detail and describes the methodology of developing the DBR scheduling system for the thruster factory. The proposed DBR scheduling system is applied to the thruster production process in order to demonstrate the procedures of production scheduling based on DBR.
원자흡광도법에 의한 용융 Ga - Sb 계 합금의 활동도 측정
윤재홍(Jae Hong Yoon),중택중후(Shigeatsu Nakazawa) 대한금속재료학회(구 대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10
The activity in the thermodynamic properties of the molten alloy systems make an offer very important information for metal refining. Activities of components in Ga-Sb molten alloy system were determined by the use of atomic absorption specetrometer (AAS) which was modified for our purpose. The heat of vaporization of an element was determined as the slope of the log(A˚T) vs 1/T plot, where A˚ is the absorbance of the vapor, and T is the temperature of the sample. Thus values obtained for Ga and Sb were close to, but some lower than those in the literature. The activities of Ga and Sb in molten Ga-Sb alloys at 1100K showed negative deviations from Raoult`s law over the whole composition range. The activity coeffients of composition elements at infinte dilution solution is γ˚ = 0.22, γ˚ = 0.18 at 1100K In addition other, thermodynamic functions was calculated on the basis of the result obtained. As a rusult of this study, atomic absorption spectrometry(AAS) was effective as activity mesurement method about alloy systems that involves not only monomeric species but also polymetric species in equilibrium vapor phase.