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李鼎基 弘益大學校 産業技術硏究所 2005 産業技術 Vol.15 No.-
A Mixed Volume and Boundary Integral Equation Method is applied for the effective analysis of elastic wave scattering problems and plane elastostatic problems in unbounded solids containing general anisotropic inclusions and voids. This new method can also be applied to general two-dimensional elastodynamic and elastostatic problems with arbitrary shapes and number of anisotropic inclusions and voids. In the formulation of this method, the continuity condition at each interface is automatically satisfied, and in contrast to finite element methods, where the full domain needs to be discretized, this method requires discretization of the inclusions only. Through the analysis of plane elastostatic problems in unbounded isotropic matrix with orthotropic inclusions and voids, and the analysis of plane wave scattering problems in unbounded isotropic matrix with isotropic inclusions and voids, it will be established that this new method is very accurate and effective for solving plane wave scattering problems and plane elastic problems in unbounded solids containing general anisotropic inclusions and voids
이정기 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.1
Capital gains taxation in Korea requires various changes to improve both its efficiency and equity. In particular, comprehensive tax on capital gains of stocks and bonds transfers on top of the real estates transactions should be gradually introduced. Furthermore, capital losses need to be acknowledged in order to maintain the able-to-pay tax principle. The tax free principle for 'one household-one housing' needs to be converted to comply with the taxing principle, but care should be taken such that the actual tax burden is not in creased by allowing sufficient tax deductions, such as housing deduction and long-term housing possession deduction.
소형 모터용 회전축의 D-cut 가공 기술 향상에 관한 연구
李鼎基 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-
In this paper, in order to improve D-cut manufacturing technology of motor shafts, the effect of the different grinding conditions on the hardness, surface roughness, and residual stress in four different kinds of steel specimens is investigated. As the grinding conditions, a CBN grinding wheel with two different angular speeds and four different feed speeds of the table are used. The steel specimens used in the experiment are STS303, STS420J2, S45C, and KOS92 specimens.
동층류 축대칭 확산화염내의 화염구조 및 매연입자 분포의 예측
이정기,김상수 대한기계학회 1992 대한기계학회논문집 Vol.16 No.8
본 연구에서는 동층류 축대칭 확산화염에서 이전까지의 화염해석 방법들을 면 밀히 고찰하여 층류 확산화염 방식의 연소문제를 해결하는데 있어서 접근이 용이하고 타당성을 가지는 화염해석 방법을 찾아내는데 있으며 매연 입자에 관한 생성및 산화모 델을 총체적으로 연결하여 실험결과와의 비교를 통해 적절한 모델인수를 결정하며 복 사효과와 열영동효과를 고려하여 화염해석과 화염내의 매연입자의 분포를 예측하는데 있다. A numerical calculation on the flame structure and soot particle distribution in a coannular laminar diffusion flame was performed. Flame analysis model utilized basically flame sheet concepts, Shvab-Zel'dovich assumption, and one step overall irreversible reaction. It was also considered the variation of thermodynamics and transport properties, and the stagnation enthalpy was used for solving temperature field. Radiation was taken into account, since it has been found to be important in determining the flame temperature in sooty flames. For soot particle analysis, we adopted the coagulation, suface condensation, and the oxidation model in addition to tesner's two-step formation model. Equations for primary soot particle excluding the agglomeration process were solved. Based on the results, the regions of soot generation, growth, and oxidation in the flame have been observed and radiation strongly influenced flame temperature and soot distribution.