http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유/무기산 혼합용출제를 이용한 중금속(카드뮴,구리)오염토양 처리공법(soil washing/flushing) 개선에 대한 연구
이홍균,김동현,조영훈,도시현,이종열,공성호,Lee, Hong-Kyun,Kim, Dong-Hyun,Jo, Young-Hoon,Do, Si-Hyun,Lee, Jong-Yeol,Kong, Sung-Ho 한국지하수토양환경학회 2009 지하수토양환경 Vol.14 No.2
토양 세척/세정(soil washing/flushing)기법을 적용하여 카드뮴과 구리로 오염된 토양을 처리하기 위해 최적의 유기산 및 무기산 용출제 선정 실험을 batch 및 column test를 통하여 수행하였다. 널리 알려진 EDTA와 비교한 Citric acid는 저분자 유기산 용출제로 구리와 카드뮴의 제거효율이 EDTA를 제외한 다른 유기산 용출제에 비해 처리효율이 높았으며, 탄산은 독성이 가장 낮으면서 토양공극효과를 동시에 수반할 수 있는 무기산 용출제로 확인되었다. 최적의 유/무기산 혼합용출제는 citric acid와 탄산의 혼합 용출제였으며, 최적 농도비는 citric aicd:탄산 = 10:1이었다. 이때의 카드뮴과 구리의 제거효율은 각각 46%와 39%이였다. 탄산은 공극 막힘 현상을 완화시키는 역할으 하는 것으로 확인되었으며, 이는 EDTA + 탄산과 citric acid+탄산에서 용출제의 유량이 점차 증가하는 것을 확인하였따. 따라서, 유/무기산 혼합 용출제는 카드뮴 및 구리로 오염된 토양 처리를 위한 세정 복원기법의 실제현상 적용 시 발생하는 토양공극 막힘 연상을 개선시켜 줄 수 있다. The applicability of soil washing/flushing to treat a contaminated soil with cadmium (Cd) and copper (Cu) using a mixture of organic/inorganic extractant was evaluated in laboratory-scale batch and column tests. Citric acid was the effective extractant to remove Cd and Cu from the soil among various organic acids except EDTA. Carbonic acid was chosen as inorganic extractant which was not only low toxicity to environment, but also increasing soil permeability. Moreover, the optimum ratio of organic and inorganic extractant to remove Cd and Cu was 10 : 1, and this ratio of organic and inorganic extractant achieved removal efficiencies of Cd (46%) and Cu (39%), respectively. The increasing flow rate of extractant could explain the phenomena of soil packing when carbonic acid was used with organic extractant (i.e. EDTA and citric acid). Therefore, a mixture of organic extractant with inorganic extractant, especially carbonic acid, could resolve a problem of soil packing when this extractant was applied to a field application to remove Cd and Cu using in-situ soil flushing process.
퍼지-신경회로망 제어기를 이용한 유도전동기의 최대토크 제어
이홍균(Hong-Gyun Lee),남수명(Su-Myeong Nam),최정식(Jung-Sik Choi),고재섭(Jae-Sub Ko),정동화(Dong-Hwa Chung) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper, we propose fuzzy-neural network controller that combines a fuzzy control and the Neural Networks for high performance control of induction motor drive. Also, this paper is proposed control of maximum torque per ampere of induction motor. This strategy is proposed which is simple in structure and has the honest goal of minimizing the stator current magnitude for given load torque. The performance of the proposed induction motor drive with maximum torque control using fuzzy-neural network controller is verified by simulation at dynamic operation conditions.
한국 중소기업의 해외마케팅역량이 수출성과에 미치는 영향
이홍균(Hong-Kyun Lee),남경두(Kyung-Doo Nam) 한국무역연구원 2014 무역연구 Vol.10 No.4
Export in Korea has been the main driving force of the nation’s economic growth, but since export is largely concentrated upon the major firms, there is a need to expand the participation of small and medium-sized enterprises in oversea markets in order to overcome the economic recession. By constructing an overall model, which includes factors such as market orientation and entrepreneurship, as a precedence factor of Korean small and medium-sized firms’ oversea marketing capabilities, this research conducted an analysis based on the surveys made upon 153 Korean exporting small and medium-sized enterprises to observe the possible effects on overseas marketing capability. The analysis result shows that both corporate entrepreneurship and market orientation are similar as the precedence factor of marketing capabilities. This research expanded the subject of study in association with business performance and marketing capabilities to small and medium-sized enterprises and the sphere of overseas marketing capabilities.