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띠형 물체의 기력수송(氣力輸送)을 위한 부하한계식(負荷限界式)
이춘식,Lee, Chun Sik 대한설비공학회 1988 설비저널 Vol.17 No.4
Pneumatic transportation systems are operated most economically, if the transportation velocity is somewhat greater than the limit velocity. Therefore it is very important to find out this limit velocity. That is well known for coarse and fine particles, but not yet for long ribbon type material. In this study a formula for the mass ratio of transported material to air in limit load point is derived for ribbon type material from the pneumatic transportation theory and the model theory. A relationship for estimating the limit velocity is also found out through experiments. The possibility of the generalization of this formula, which is obtained from a given pneumatic transportation system, should be estimated through further systematic studies.
이춘식(Lee, Chun Sik),임태효(Im, Taehyo),권헌각(Kwon, Heongak) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.4
본 연구에서는 판문천 유역에 대해 강우 시 유량 및 수질 모니터링 결과를 활용하여 L-Thia 모형을 보정하고 해당 유역에서의 비점오염원 부하량을 산정하였다. 모의된 비점오염원 부하량은 토지피복 군에 따라 산정하였다. BOD의 경우 대지에서 발생되는 비점오염원 부하량이 1503.49 kg/year로 가장 높게 산정되었으며 임야 746.43 kg/year > 밭 502.77 kg/year > 논 250.62 kg/year> 기타 55.93 kg/year 순으로 비점오염원 부하량 차이를 나타내었다. T-N 항목의 경우 BOD와 유사한 형태로 대지에서 922.71kg/year로 가장 높은 부하량을 나타내었으며, 산림 853.42 kg/year > 밭 588.09 kg/year > 논 184.12 kg/year > 기타 77.73 kg/year순으로 차이를 나타내었다. T-P 항목의 경우에는 밭에서 192.15 kg/year로 가장 높은 부하량을 나타내었으며, 다음으로는 산림 122.62 kg/year >대지 110.82 kg/year > 논 24.50 kg/year > 기타 20.17 kg/year 순으로 부하량 차이를 나타내었다. 토지피복을 상세화 하여 발생되는 비점오염원 부하량을 비교한 결과, 인위적 관리 또는 개발이 되는 피복의 부하량이 높게 조사되었다. In this study, we calibrate the L-thia model using the flow and water quality monitoring results for the Pan Muncheon watershed and simulate the nonpoint source loads for the watershed. The simulated nonpoint source loadings were estimated according to the land cover classification. In case of BOD, the nonpoint source load from the site was the highest at 1503.49 kg/year, with 746.43 kg/year for wood and forest, 502.77 kg/year for upland, and 250.62 kg/year for paddy, and 55.93 kg/year for other. In the case of T-N items, it was surveyed similar to BOD, and showed the highest load at 922.71 kg/year on the site, and showed the difference in loading in the order of 853.42 kg/year for wood and forest and 588.09 kg/year for upland, 184.12 kg/year for paddy, and 77.73 kg/year for other. The T-P items were the highest at 192.15 kg/year in the upland, and the loadings were shown in the order of wood and forest 122.62 kg/year and site 110.82 kg/year in the following order. As a result of the comparison of the nonpoint source loadings with the details of the land cover, the load of the land cover to which the artificial management or development was carried out was high.
나노직관채널 형상에 따른 나노유체의 혼합 및 열전달 특성연구
이춘식(Chun-Sik Lee),서장원(Jang-Won Seo),이규정(Kyu-Jung Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this study the mixing and heat transfer characteristics of nanofluids are simulated in straight channels which have the periodic obstacles. Several geometric configurations are adopted to find the effects of the width and height of obstacle. Also local temperature distribution is investigated in vertical direction of the channel. So, we use a classical MD simulation and consider the intermolecular force not only among fluid molecules but also between the fluid atoms and the solid wall particles. As a result, it is founded that mixing efficiency and temperature variation is strongly dependent on obstacle shapes.