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이차원의 대류-확산 현상 해석에서 업와인드 방식에 의한 수치적 확산을 줄이기 위한 방법 연구
이경진,김숭평 조선대학교 원자력연구소 1990 原子力硏究 Vol.4 No.-
In solving the convection-diffusion phenomena, it is common to use central difference scheme or upwind scheme. The central difference scheme has second order accuracy, while the upwind scheme is only first order accurte. However, since the variation rising in the convection-diffusion problem is exponential, central difference scheme ceased to be a good method for anything but extremely small values of Δx. At large values of Δx, which is all one can afford in most practical problems, it is the upwind scheme that gives more reasonable results than the central scheme. But in the conventional upwind scheme, since the accuracy is only first order, false diffusion is some what large, and when the real diffusion is smaller than the numerical diffusion, solutions may be very errorneous. So in this paper, a method to reduce the numerical diffusion of upwind schme is studied. Developed scheme uses same number of nodes as conventional upwind scheme, but it considers the direction of flow more sophistically. As a conclusion, the developed scheme shows very good results. It can reduce false diffusion greatly with the cost of small complexity. Also, algorithm of the developed scheme is presented at appendix.
이경진,성기원,이재수,최창락,송진언 대한신경외과학회 1989 Journal of Korean neurosurgical society Vol.18 No.4
From March 1966 to July 1988, 22 patients were diagnosed as discitis among the 2106 operation with total or hemilaminectomy in Department of Neurosurgery of Catholic University Medical College. Main symptoms were severe low back(95%) and buttock pain(86%). Physical examination showed severe paravertebral spasm and tenderness. The erythrocyte sedimentation rate was always elevated in all cases and averaged to 43㎜/hr. X-ray examination of the lumbar spine showed typical findings of decreased intervertebral space, subchondral sclerosis and bony fusion. In bacterial culture staphylococcus aureus and streptococcus epididymis were grown. Good long-term results were seen in all cases.
정신분열병환자의 뇌량에 대한 신경병리적 고찰 : 확산텐서영상(Diffusion Tensor Image)기법의 적용
이경진,신용욱,하태현,이종민,김인영,김선일,문원진,정은철,박해정,오정은,박지영,강경훈,권기원,권준수 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.4
Objectives : Diffusion tensor imaging (DTI) is a new technique that can be used to visualize and measure the diffusion of water in brain tissue. It is particularly useful for evaluating white matter abnormalities. In this paper, we investigated the neuropathology of the corpus callosum in patients with schizophrenia through the new methods, diffusion tensor imaging. Methods : Diffuse tensor imaging was performed in 19 schizophrenic patients and 26 healthy controls. One complementary measure, fractional anisotropy (FA), which is considered to be sensitive indices of axonal integrity, was obtained from regions of interest in the five areas of the corpus callosum. Neuropsychological measurement also underwent for measurement of frontal lobe function in two groups. Results : There were no significant differences of FA in the DTI measures for either the schizophrenic patients compared with controls. FA was significantly decreased in women compared with men. Neuropsychological measurements such as Wisconsin card sorting test were correlated with FA of patients with schizophrenia. Conclusion : FA measures revealed no differences between schizophrenia and controls. The findings suggest that the structural integrity of white matter in patient with schizophrenia was not disrupted. The results are discussed in relation to previous studies reporting positive and negative findings. It is concluded that further studies using DTI in larger samples, improved and standardized methods of data acquisition and analysis are needed.
A Numerical Analysis on Heat Inflow into a Rectangular Cavity
이경진,천원기 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.2
A numerical experiment about thermal discharge into a rectangular shaped enclosed body of fluid that has one inlet and one outlet jet has been carried out. Three two-dimensional partial differential equations (the heat transport equation, vorticity transport equation and stream function equation) that are coupled by the nature of the problem were solved by using the Alternating Direction Implicit method and Successive Over-Relaxation. A computer program was developed on the basis of these algorithms to give the temperature and velocity distribution a t each time step. The results are then reviewed in terms of the physical parameters involved. The numerical stability of the scheme is also discussed. Depending on the actual boundary conditions, the numerical results obtained could provide some information to predict the flow pattern and thermal penetration within the lower convective zone of a saltstratified solar pond as well as inside the heat storage units of other heat collection systems.