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소석회와 CO<sub>2</sub>를 이용한 상수관로의 부식제어(II) - 관종별 부식특성 평가
이두진,김영일,송영일,박현아,Lee, Doo-Jin,Kim, Young-Il,Song, Young-Il,Park, Hyun-A 대한상하수도학회 2008 상하수도학회지 Vol.22 No.3
The pH & alkalinity adjustment method by lime and carbon dioxide($CO_2$) for corrosion control in water distribution system was investigated to evaluate the corrosion characteristics of metal pipes, such as galvanized iron, copper, stainless steel, and carbon steel. When the pH in sand filtered and ozone+GAC treated water was increased with lime and $CO_2$ from 7.5 to 8.0, the concentration of residual chlorine decreased at higher pH and longer reaction time; the concentration of trihalomethane increased. The corrosion rate of coupons with corrosion control using lime and carbon dioxide was showed much smaller than those without corrosion control using pilot-scale simulated distribution system. The galvanized iron was corroded much faster than carbon steel, copper, and stainless steel. Especially, copper and stainless steel coupons were hardly corroded. The galvanized iron and carbon steel coupons with corrosion control were produced the corrosion products less than those without corrosion control by the results of environmental scanning electron microscope(ESEM) and energy dispersive x-ray spectroscopy(EDS) analyses. The galvanized iron coupon with pH and alkalinity adjustment by lime and carbon dioxide was detected about 30 percent of zinc, when the carbon steel was detected about 30 percent of calcium by calcium carbonate products formation. For the results of X-ray diffraction(XRD) analyses, the goethite(${\alpha}$-FeOOH) was identified as primary corrosion product of galvanized iron without corrosion control, while the Zinc oxide(ZnO) was found on corrosion products of galvanized iron coupon with corrosion control as the results of EDS analyses. However, the carbon steel corrosion products regardless of corrosion control were composed predominantly of maghemite(${\gamma}-Fe_2O_3$) and hematite(${\alpha}-Fe_2O_3$).
소형 코먼레일 디젤 엔진에서의 조기 분사가 연소 및 배기특성에 미치는 영향
이두진(Doo Jin Lee),김명윤(Myung Yoon Kim),윤승현(Seung Hyun Yoon),노현구(Hyun Gu Roh),이제형(Je Hyung Lee),이창식(Chang Sik Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An experimental investigation of early injection were conducted on a small single cylinder common-rail diesel engine to reduce NOx emission. The main objectives of the study were to investigate the emissions, performance ad combustion characteristics of partially homogeneous charge compression ignition combustion. The two stage injection was conducted to reduce wall-wetting of early injected spray on the cylinder wall and to promote the ignition of premixed charge. The engine test was performed at conditions of 1500rpm, injection timing ranging from TDC to BTDC 80˚. The experimental results show that NOx emissions of early injection and two stage injection decreased than conventional diesel injection combustion (near TDC injection), but soot, incomplete products (i.e. HC ad CO) are slightly increased. Also, the second injection near TDC promoted the ignition of premixed fuel, therefore, IMEP was increased.
개도국에 대한 직업교육훈련 공여사업 원조효과성 제고를 위한 연구
이두진(Doo-Jin Lee),허요(Yo Heo) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.4
Korea is the unique country that has the history of an assistance-recipient country and an assistance-donor country as well, at the same time. This study first defines the theoretical concept of ODA(Official Development Assistance), the ODA policies of the industrialized countries, and the Korean ODA organizations with their roles, and then presents the points of consideration to be made when proceeding the development projects of vocational education and training for developing countries, as a donor country, based on the reports prepared with focus on some cases of the vocational education and training development projects provided by Korea, and the opinions of the project participants. The objective of this study is to provide a guide material that the government and related organizations should refer to, in order to help improve the aid efficiency of the development projects provided to the developing countries by way of ODA in transferring Korea s Framework and the System of Vocational Education and Training , by enabling that the receiving countries can train and provide high-quality skilled workers to the labour market, thus contribute to countries industrial development and the beneficiaries themselves get the education and training opportunities to be relieved from poverty. This study has been carried out, with a view to rendering useful service for increasing the efficiency level of vocational education and training development projects, which will grow in the of ODA, according to Korea s international status that has changed after having acquired the membership of OECD/DAC.