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열수전처리를 통한 폐활성 슬러지의 혐기성 소화 효율 향상에 관한 연구
이성준,이관용,김대기,박기영 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2014 No.-
혐기성 소화는 하수 슬러지의 저감 및 안정화 외에도 유기성 슬러지로부터 메탄을 생산하여 에너지원으로 활용할 수 있는 장점이 있다. 그러나 혐기성 소화는 긴 체류시간으로 인해 큰 용량의 소화조가 필요하고 많은 경우 제대로 성능을 발휘하지 못한 채 안정적으로 운전되지 못하고 있다. 이러한 문제를 해결하기 위해 하수슬러지의 혐기성 소화와 관련하여 많은 연구결과들이 보고되고 있으며, 이러한 보고들에서 공통적으로 잉여슬러지의 가용화 단계가 혐기성소화의 속도를 제한하는 인자임을 보고하고 있다. 슬러지의 가용화를 위한 전처리 방법은 대표적으로 산, 염기 등을 사용하는 화학적 처리, 기계적 파쇄, 초음파 등의 물리적 처리로 구분할 수 있으며, 다양한 방법들을 이용하여 슬러지 가용화를 위한 전처리 연구에 적용 되고 있다. 본 연구에서는 폐활성슬러지(Waste Activated Sludge)의 혐기성 소화 효율을 높이기 위한 전처리 방법으로 열수처리공정을 이용하였으며, 혐기성 소화효율은 BMP test를 통한 바이오가스 생산량 비교와 메탄 생산량 등으로 분석하였다. 또한 전처리에 의한 고형물 감량 효과를 측정하기 위하여 휘발성 고형물 감량율(VSR; Volatile solid reduction)을 분석하였다. BMP test 결과 열수처리 온도 120℃에서 전처리한 폐활성 슬러지의 가스 발생량이 전처리 하지 않은 폐활성슬러지의 가스 발생량에 비하여 약 60% 증가한 490mL-biogas/g-VS으로 가장 높은 바이오가스 발생량을 보였으며, 휘발성 고형물 감량(VSR)에서도 열수처리 온도 120℃에서 VS감량율 61.4%로 전처리하지 않은 슬러지의 VS 감량율 45.1%보다 증가하여 가장 높은 VSR을 보였다.
The Relationship between Economic Growth and FDI in China’s Xinjiang Province
이성준,유념 한국유통경영학회 2014 유통경영학회지 Vol.17 No.5
As China’s Xinjiang state have many kinds of raw materials and located on the old Silk Road,distribution and logistics has been developed well and inflows of foreign direct investment(FDI) hasbeen increased much since 1980. Compared with other Chinese provinces, Xinjiang has numerouspolicies and resources that attract foreign investment, which many foreign firms have begun payingattention to, looking for investment opportunities. Based on this situation, this study examines therelationship between economic development in Xinjiang and foreign direct investment. To do so, weset up an error correction model (VECM) that considers the results of the tests, structural breaks,and unit-root and cointegration tests. Our empirical tests show that FDI, trade openness, and human capital have long-term positiveeffects on economic growth, but no short-term effects on economic growth. Lastly, we proposepossible policy implications of these results.
대형 운행 경유 자동차 자연재생DPF 재생 개선을 위한 정비방안 마련 연구
이성준,한검승,하성용,Lee, Sungjun,Han, Geomseung,Ha, Sungyong 한국자동차안전학회 2021 자동차안전학회지 Vol.13 No.3
Diesel engines emit PM and NOx during combustion. This is the main culprit of fine dust, which seriously affects the atmospheric environment. In particular, large-sized diesel vehicles over 3.5 tons emit a greater amount of pollutants because of their large displacement. The occurrence of vehicle abnormalities in this large-scale diesel vehicle causes even greater problems in the atmospheric environment. It was confirmed that there were many problems caused by natural regeneration DPF among large-sized diesel vehicles. Therefore, the most effective maintenance plan is suggested.
풍납토성 축조연대의 고고과학적 연구 –2011년 동성벽 조사결과를 중심으로–
이성준,김명진,나혜림 한국고고학회 2013 한국고고학보 Vol.88 No.-
This study aims to restructure the archaeological context and depositional sequence based on archaeological stratigraphic methods in order to insure the statistical precision of absolute dating and to determine the prior probability model in Bayesian statistics. The archaeological data concerning the formation and post-depositional processes of the site following the 2011 excavation of Pungnab Earthen Wall Fortress by the National Research Institute of Cultural Heritage contributed to the improved reliability of the results from radiocarbon dating and optically stimulated luminescence dating. The archaeological stratigraphic information was able to provide a time series of archaeological data which made it possible to grasp the formation and post-depositional processes of the site and contributed to the improved statistical precision of absolute dating. Bayesian statistics is not a method that can be used to scientifically modify or examine archaeological seriation, but is a useful method in analyzing the temporality of past human activity which took place during a time span shorter than the transition range of material culture, using the prior probability model based on the archaeological sequence.
스테플러와 고무밴드를 이용한 간편하고 빠른 봉합고정 드레싱
이성준,김용욱,박병윤 대한성형외과학회 2003 Archives of Plastic Surgery Vol.30 No.3
The tie-over dressing is a time consuming work because the long silk sutures get tangled and one must spend time on securing the ends. However it is a necessary procedure for a better take of the skin graft.The skin graft was prepared as a split-thickness graft with or without meshing. After hemostasis of the recipient defect, the prepared skin was placed and tailored for the defect. The skin stapler hold the skin margin, split- thickness graft and a round rubber band in one stitch. And the mesh gauze with ointment was applied over the grafted skin and the bulky moist dressing was applied with fluffy gauze and cotton. Over the bulky dressing the rubber bands crossed over and fixed on the other side of the surrounding edge on the normal skin area by the skin stapler. In case of need, splint and compressive dressing with elastic bandage was applied. From January, 2002 to September, 2002, in 15 patients, this method has been used and proven satisfactory. Skin graft was well taken and the time for tie-over dressing can be reduced markedly. We can ensure the adherence of a skin graft to the bed of the wound by continuous pressure dressing. This technique is simple, fast, and no needs of any special device or dressing materials.