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전산유체역학을 이용한 테일러-쿠에트 반응기의 형상 변화에 따른 유동특성 연구
김부성(Bu Seong Kim),윤재룡(Jae Ryong Yoon),배성민(Sung Min Bae),전동협(Dong Hyup Jeon) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
We conducted the three-dimensional fluid flow analysis in various Taylor-Couette reactors using computational fluid dynamics. We investigated the flow characteristics at Turbulent Taylor Vortex Flow regime. The differences of vortex number and length were identified with the length of eccentricity, composition of eccentricity and the angle between the parent line of the Taylor reactor. When the eccentricity of the Y-axis was changed, the speed of the eccentric increased, but the eccentricity caused the speed difference on the Y-axis. When the eccentricity of the lct reactor was triangular, the eccentricity was most easily found in the mixture of substances when the eccentric was 6mm to 8mm. As the angles of the cylinder changed, the larger the angles of the cylinder caused more and less bypass areas. The result showed that the simulation results are agreed well with experimental data.
카본블랙의 형태 특성이 천연고무 배합 물성에 미치는 영향
최관영,윤재룡,김휘중 한국고무학회 1998 엘라스토머 및 콤포지트 Vol.33 No.1
Natural rubber was filled with 8 commercial carbon blacks covering range of rubber-grade products at different levels of filler loadings in order to investigate physical compound and vulcanizate properties. It was found that the curves of rubber property vs filler loading of both uncured compounds and vulcanizates can be superposed to one single master curve by introducing an effective volume fraction which is based on CDBP. The effective volume fraction, V_(Eff) was utilized to explain the variation of the stiffness of all rubber compounds. The surface area-corrected effective volume fraction, V', was utilized to explain the formation of bound rubber, rebound and lambourn wear.
전판석,양의중,장석정,김충현,윤재룡,신호 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.7
The development and differentiation of cells in the spinal ganglion were studied by electron microscopy in human fetuses ranging from 12㎜ to 260㎜ crown rump length. At 12㎜ embryo the primitive neuroblasts which had a single process, contained a large numbers of free ribosome and mitochondria but very little rough endoplasmic reticulum. At 30㎜ fetus, the primitive spinal ganglion consisted of bipolar neuroblasts, satellite cells and undifferentiated cells. Spindle-shaped bipolar neuroblasts formed spinal ganglion of loosely grouped cells at 50㎜ fetus. Two neuroblast cell types, a small cell contained large clumps of rough endoplasmic reticulum at periphery, could be distinguished. At 80㎜ fetus, the spinal ganglion constituted of bipolar neuroblast with apparently random distribution of small and large neurous with process, together with satellite cells and blood vessels. The presences of a large numbers of neurotubules in the Golgi-central region were one of the first sign of further maturation of the neuroblast. During next prenatal stage from 120㎜ on fetus, the ganglion cells were large and contained much rough endoplasmic reticulum, neurotubules and extensive Golgi complex. A large number of neuroblasts became transformed into unipolar cells from 180㎜ to 260㎜ feuts. Nissl bodies appeared during this stage. The ganglion-satellite cell boundary became complicated with increasing age, thus enlarging in parallel with the increase in volume of the nerve cell. During next prenatal stage up to 180㎜ fetus, the unipolar ganglion cell increased in number and size, and the cytoplsm contained all intracytoplasmic structures which were also found in mature spinal ganglion except for large pigment granules.