http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Euh, Hyung-Jin (검색결과 339 건)
- 무료
- 기관 내 무료
- 유료
-
정의덕,강신원,박덕수,신학기,백우현 한국환경과학회 2000 한국환경과학회지 Vol.9 No.5
A study on the removal of Pb ion from Pb-contaminated soil was carried out, using ex-situ extraction process. Tartaric acid (TA) and iminodiacetic acid sodium salt (IDA) as a washing agent were evaluated as a function of concentration, reaction time, mixing ratio of washing agent and recycling of washing agent. TA showed a better extraction performance than IDA. The optimum washing condition of TA and IDA were in the ratio of 1 : 15 and 1 : 20 between soil and acid solution during 1 hr reaction. The total concentrations of Pb ion by TA and IDA at three repeated extraction, were 368.8 ppm and 267.5 ppm, respectively. The recovery of Pb ion from washing solution was achieved by adding calcium hydroxide and sodium sulfide, form the precipitation of lead hydroxide and lead sulfide, and optimum amounts of sodium sulfide and calcium hydroxide were 7 g/ℓ for the TA washing solution and 4 g/ℓ , 5 g/ℓ for the IDA washing solution, respectively. The efficiency of recycle for TA and IDA washing solution were 78.8%, 95.1% and 89.2%, 96.6%, at third extractions under Na_2S and Ca(OH)_2, respectively.
-
정의덕,강신원,백우현 한국환경과학회 2000 한국환경과학회지 Vol.9 No.1
A study on the remediation of heavily Fe ion contaminated soils from abandoned iron mine was carried out, using ex-situ extraction process. Also, oxalic acid as a complex agent was evaluated as a function of concentration, reaction time and mixing ratio of washing agent in order to evaluate Fe removability of the soil contaminated from the abandoned iron mine. Oxalic acid showed a better extraction performance than 0.1N-HCI, i.e., the concentrations of Fe ion extracted from the abandoned mine for the former at uncontrolled pH and the latter were 1,750 ppm and 1,079 ppm, respectively. The optimum washing condition of oxalic acid was in the ratio of 1:5 and 1:10 between soil and acid solution during 1 hr reaction. The total concentrations of Fe ion by oxalic acid and EDTA at three repeated extraction, were 4,554 ppm and 864 ppm, respectively. The recovery of Fe ions from washing solution was achieved, forming hydroxide precipitation and metal sulfide under excess of calcium hydroxide and sodium sulfide. In addition, the amounted of sodium sulfide and calcium hydroxide for the optimal recovery of Fe were 15g/ℓ and 5g/ℓ from the oxalic acid complexes, respectively.
-
백우현,정의덕,윤천기 한국환경과학회 2000 한국환경과학회지 Vol.9 No.5
The characteristics of Far-infrared rays mineral water(FIR water) have been compared to the tap water by means of relationship between FIR water and Nuclear Magnetic Resonance spectroscopy(NMR), FIR water and thermography, FIR water and velocity of blood, FIR-water and pH, FIR water and dissolved oxygen(DO), FIR water and Oxidation-Reduction Potential(ORP), using the development FIR water purification of grand prix system. From the experimental result are quite satisfactory when compared with the tap water. Also, the FIR water were evaluated to see if those are tasty and healthy using the Hashimoto's Mineral Balance Index. As a result, FIR-water was found as tasty and healthy.
-
Dynamic Modeling of Lactic Acid Fermentation Metabolism with Lactococcus Lactis
Euh Lim Oh,Ming Shou Lu,Chang Hun Park,Han Bin Oh,Sang Yup Lee,Jin Won Lee 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.2
A dynamic model of lactic acid fermentation using Lactococcus lactis was constructed, and a metabolic flux analysis (MFA) and metabolic control analysis (MCA) were performed to reveal an intensive metabolic understanding of lactic acid bacteria (LAB). The parameter estimation was conducted with COPASI software to construct a more accurate metabolic model. The experimental data used in the parameter estimation were obtained from an LC-MS/MS analysis and time-course simulation study. The MFA results were a reasonable explanation of the experimental data. Through the parameter estimation, the metabolic system of lactic acid bacteria can be thoroughly understood through comparisons with the original parameters. The coefficients derived from the MCA indicated that the reaction rate of L-lactate dehydrogenase was activated by fructose 1,6-bisphosphate and pyruvate, and pyruvate appeared to be a stronger activator of L-lactate dehydrogenase than fructose 1,6-bisphosphate. Additionally, pyruvate acted as an inhibitor to pyruvate kinase and the phosphotransferase system. Glucose 6-phosphate and phosphoenolpyruvate showed activation effects on pyruvate kinase. Hexose transporter was the strongest effector on the flux through L-lactate dehydrogenase. The concentration control coefficient (CCC) showed similar results to the flux control coefficient (FCC).
-
-
Euh, Yoon Dae,Amsden, Alice H 고려대학교 경영대학 1990 경영논총 Vol.33 No.1
Because Korea's economy has grown so fast, its financial reforms have been a subject of curiosity in other developing countries. The Korean financial system has changed in the 1980s in conjunction with rapid industrial transformation and external pressures. Yet it would be misleading to characterize such change simply as a move towards freer markets. There has been some liberalization of financial markets in Korea, but the financial system continues to operate within the context of industrial policy. Crisis-avoidance and the objectives of financial reform have largely been achieved by means of creating new institutions or adapting old ones, rather than by relying on the price mechanism. Improved efficiency in the delivery of financial services has not necessarily been dependent on liberalizing interest rates. A knowledge of Korea's financial reforms may help other developing countries establish equivalent, if different, institutions to achieve their own financial goals. Part Ⅰ summarizes the changes that Korea s financial system has undergone in the 1980s. Part Ⅱ examines Koreas financial system within the context of industrial policy. Two episodes are examined : The system of bank credit allocation before the 1980s, and the move towards the development of a stock market and direct finance after 1980. Part Ⅲ penetrates more deeply into the cavernous gulf dividing myth and reality in the Korean model. The issues considered are the degree to which the Korean economy was ailing at the time it launched its reforms ; the issue of how to measure the efficiency of capital markets : the relationship between liberalization and equity ; and the degree to which savings are related to interest rates. Because this essay is concerned principally with financial reform in relation to industrialization rather that macroeconomic management, relatively little is said about the reform of monetary policy. A short section in Part Ⅰ briefly reviews the outstanding developments.
-
Euh, D.J.,Kim, K.H.,Youn, Y.J.,Bae, J.H.,Chu, I.C.,Kim, J.T.,Kang, H.S.,Choi, H.S.,Lee, S.T.,Kwon, T.S. Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.7
In order to quantify the flow distribution characteristics of APR+ reactor, a test was performed on a test facility, ACOP ($\underline{A}$PR+ $\underline{C}$ore Flow & $\underline{P}$ressure Test Facility), having a length scale of 1/5 referring to the prototype plant. The major parameters are core inlet flow and outlet pressure distribution and sectional pressure drops along the major flow path inside reactor vessel. To preserve the flow characteristics of prototype plant, the test facility was designed based on a preservation of major flow path geometry. An Euler number is considered as primary dimensionless parameter, which is conserved with a 1/40.9 of Reynolds number scaling ratio. ACOP simplifies each fuel assembly into a hydraulic simulator having the same axial flow resistance and lateral cross flow characteristics. In order to supply boundary condition to estimate thermal margins of the reactor, the distribution of inlet core flow and core exit pressure were measured in each of 257 fuel assembly simulators. In total, 584 points of static pressure and differential pressures were measured with a limited number of differential pressure transmitters by developing a sequential operation system of valves. In the current study, reactor flow characteristics under the balanced four-cold leg flow conditions at each of the cold legs were quantified, which is a part of the test matrix composing the APR+ flow distribution test program. The final identification of the reactor flow distribution was obtained by ensemble averaging 15 independent test data. The details of the design of the test facility, experiment, and data analysis are included in the current paper.
-
-
Euh, D.J.,Kim, S.,Kim, B.D.,Park, W.M.,Kim, K.D.,Bae, J.H.,Lee, J.Y.,Yun, B.J. Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.5
Multi-dimensional two-phase phenomena occur in many industrial applications, particularly in a nuclear reactor during steady operation or a transient period. Appropriate modeling of complicated behavior induced by a multi-dimensional flow is important for the reactor safety analysis results. SPACE, a safety analysis code for thermal hydraulic systems which is currently being developed, was designed to have the capacity of multi-dimensional two-phase thermo-dynamic phenomena induced in the various phases of a nuclear system. To validate the performance of SPACE, a two-dimensional two-phase flow test was performed with slab geometry of the test section having a scale of $1.43m{\times}1.43m{\times}0.11m$. The test section has three inlet and three outlet nozzles on the bottom and top gap walls, respectively, and two outlet nozzles installed directly on the surface of the slab. Various kinds of two-dimensional air/water flows were simulated by selecting combinations of the inlet and outlet nozzles. In this study, two-dimensional two-phase void fraction profiles were quantified by measuring the local gap impedance at 225 points. The flow conditions cover various flow regimes by controlling the flow rate at the inlet boundary. For each selected inlet and outlet nozzle combination, the water flow rate ranged from 2 to 20 kg/s, and the air flow rate ranged from 2.0 to 20 g/s, which corresponds to 0.4 to 4 m/s and 0.2 to 2.3 m/s of the superficial liquid and gas velocities based on the inlet port area, respectively.
-
Euh, Seung Hee,Choi, Yun Sung,Nam, Yun Sung,Lee, Chung Gun,Lee, Sang Yeol,Oh, Kwang Cheol,Oh, Jae Heun,Kim, Dae Hyun Elsevier 2018 ENERGY Vol.161 No.-
<P><B>Abstract</B></P> <P>This study presents a real-time drying control system that was developed to control air drying of sawdust in a pneumatic conveying dryer to produce high-grade wood pellets in the range of the target moisture content (MC). The real-time drying control system was installed with moisture sensors to control the ON/OFF periods of the fuel (pellet) supply motor for the sawdust to generate the heat necessary to dry the sawdust to an optimum level of 15% moisture content for pelletizing. The results of the experiment and the simulation showed that the drying efficiency improved when a buffer was introduced instead of using a conventional system, and the average moisture content of the dried sawdust was measured to be about 12.4% in a pneumatic conveying dryer without buffer and about 14.7%–15.2% in the developed real-time drying control system. This study shows that the real-time drying control system could dry the sawdust to the targeted constant moisture content, and the buffer in the pneumatic conveying dryer could improve the drying efficiency according to an increase in the resident time of the sawdust.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A real-time drying control system was developed to control the air drying process for sawdust in a pneumatic conveying dryer. </LI> <LI> Drying efficiency was improved when the buffer was present instead of the conventional system. </LI> <LI> The real-time drying control system dries the sawdust with constant range compared to the initial moisture content. </LI> </UL> </P>
ScienceON
DBpia연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
