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Particle Tracing Simulations of Dielectrophoretic and Magnetophoretic Flows in Magnetic Nanofluids
Lee, Won-Ho,Kim, Sung-Min,Lee, Sangyoup,Lee, Jong-Chul American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>Alternating current breakdown voltage of magnetic nanofluids with different volume concentrations of magnetic nanoparticles was investigated and compared to that of mineral oil. The magnetic nanofluids exhibited better or worse breakdown strength compared to base fluids according to the amount of magnetic nanoparticles. However, the possible mechanisms behind the change in breakdown strength due to the amount of magnetic nanoparticles are not clearly understood. In this study, a numerical simulation of magnetic nanoparticles in an insulating fluid was developed to model particle tracing for dielectrophoretic and magnetophoretic flows in microfluidic system according to different volume concentrations of magnetic nanoparticles. Possible mechanism involved in the change of breakdown strength due to the behavior of magnetic nanoparticles was also proposed in this study.</P>
A new approach to the characterization of reverse osmosis membrane by dynamic hysteresis
Lee, Eunsu,Lee, Sangyoup,Hong, Seungkwan Balaban Publishers 2010 Desalination and Water Treatment Vol.18 No.1
<P> Physical aspects of dynamic hysteresis for characterizing reverse osmosis (RO) membranes have been investigated. Dynamic hysteresis was used as a parameter of showing physical surface characteristics of RO membranes. Automated microbalance was utilized to determine dynamic hysteresis based on the Wilhelmy plate method. Dynamic hysteresis determined with non-polar liquid was related to physical surface characteristics including surface roughness and heterogeneity determined by atomic force microscopy imaging and analysis. A remarkable correlation between dynamic hysteresis and surface heterogeneity was obtained when nonpolar liquid was used during the measurements. Dynamic hysteresis increased as the surface heterogeneity of RO membrane increased. </P>
Lee, Jong-Chul,Lee, Sangyoup American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.9
<P>Magnetic fluid is a stable colloidal mixture contained magnetic nanoparticles coated with a surfactant. Recently, it was found that the fluid has properties to increase heat transfer and dielectric characteristics due to the added magnetic nanoparticles in transformer oils. The magnetic nanoparticles in the fluid experience an electrical force directed toward the place of maximum electric field strength when the electric field is applied. And when the external magnetic field is applied, the magnetic nanoparticles form long chains oriented along the direction of the field. The behaviors of magnetic nanoparticles in both the fields must play an important role in changing the heat transfer and dielectric characteristics of the fluids. In this study, we visualized the movement of magnetic nanoparticles influenced by both the fields applied in-situ. It was found that the magnetic nanoparticles travel in the region near the electrode by the electric field and form long chains along the field direction by the magnetic field. It can be inferred that the movement of magnetic nanoparticles appears by both the fields, and the breakdown voltage of transformer oil based magnetic fluids might be influenced according to the dispersion of magnetic nanoparticles.</P>
李尙燁(Sangyoup Lee) 중부고고학회 2006 고고학 Vol.5 No.1
환호는 최근까지 대부분 영남지방을 중심으로 확인되었으나, 조사의 증가에 따라 중부지역에서도 다수 확인되었다. 따라서 중부지역에서 환호 중 안성 반제리유적의 환호를 중심으로 그 기능을 살펴보고자 하였다. 환호는 전세계적으로 분포하고 있으며, 시기적으로는 신석기시대 이후부터 출현하고 있는데, 대부분은 주거지와 동반되는 것이 일반적 현상이다. 이러한 환호의 기능에 대해 대부분 방어ㆍ경계ㆍ의례를 위해 조성된 것으로 이해하고 있다. 중부지역에서 확인된 환호는 안성 반제리유적ㆍ부천 고강동 적석유구ㆍ화성 동탄 동학산유적ㆍ오산 가장동유적ㆍ부여 송국리유적ㆍ청원 대율리유적ㆍ강릉 방동리유적 등이며, 입지를 통해 산정형과 구릉형, 형태를 통해 테뫼형 환호와 포곡형 환호로 구분할 수 있다. 안성 반제리유적에서 확인된 환호는 입지상 산정형, 형태상 태뫼형에 해당된다. 환호의 내부에는 환호가 처음 사용되었던 시기의 주거지가 확인되지 않으며, 정상부에 비교적 큰 규모의 바위가 자리하고 있다. 한편 환호는 기능이 상실됨에 따라 폐기되었으며, 이후 환호 내부 또는 환호를 파괴하고 초기철기시대의 주거지가 조성되었다. 안성 반제리유적 환호의 사용시기는 환호의 퇴적토에서 출토된 유물 원형정토대토기와 두형토기 등을 통해 B.C. 5세기에 처음 조성되었던 것으로 추정되며, 정확한 폐기 시기는 알 수 없는 실정이다. 한편 환호 폐기 후 조성된 주거지 출토유물 중 구연의 단면이 원형에서 방형으로 변화되는 토기를 통해 반제리유적은 B.C. 2세기 이전에 폐기된 듯하다. 환호의 기능은 초축시 내부에 생활과 관련된 공간인 주거지가 확인되지 않아 환호의 제기능 중 儀禮 즉, 祭儀의 기능을 수행하였던 것으로 추정하였다. Ditches were discovered around the yeongnam area until a recent date but discovered around the middle area by increased research. So we will inspect the function of ditches of the Ban je-ri ruins among ditches of the middle area. Ditches are distributed all over the world. It appeared after the New Stone Age and most of it usually be accompanied with habitation site. We understand that the function of ditches is for defense, precaution and ceremony. Ditches which were discovered around the middle area are the Ban je-ri ruins in the Anseong city, the Jeokseok synonymous phrase in the Gokang-dong. Bucheon city, the Donghak mountain ruins in the Dongtan. Hwaseong city, Gajang-dong ruins in the Osan city. Songguk-ri ruins in the Buyeo-gun, Bangdong-ri ruins in the Gangneung city, And that is classified a mountaintop type and hill type by location and a headband type and pile up block shape. Ditches were discovered in the Ban je-ri. Anseong city is a mountaintop type by location and a headband type by shape. The habitation site where was used at first stage wasn’t discovered in the inside of ditches and there is relatively big rock in the top. On the other hand ditches were disused by losing function. Then the habitation of the first Iron Age was formed after destroying the ditches or inside of ditches. We presumed the used time of the ditches of Ban je-ri. Anseong city is B.C. 5th century through bowl with round clay stripe and mounted dish from a sedimentary soil of the ditches. Disused time is unknown but we presumed the disused time is before B.C. 2nd century through dish section was changed to square shape from round shape among excavated ruins on the habitation which was formed afterdisusing ditches. We presumed that function or ditches is ceremony because the habitation where is a space in relation to life wasn’t discovered when it was under construction.