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강희인,이원학,오해수,김동석,김상중,Kang, Hee-In,Lee, Won-Hak,Oh, Hae-Soo,Kim, Dong-Suk,Kim, Sang-Joong 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.6
Keratoacanthoma is a benign, self-limited epithelial lesion that closely resembles Squamous cell carcinoma(SCC). Keratoacanthoma occur primarily exposed skin in male patients over 45 years of ages. although etiology is unknown, sunlight, genetic, and human papillomavirus factor have been considered. in clinical feature, rapid enlargement occurs over 4$\sim$8 weeks, resulting ultimately in a hemispheric, firm, elevated, asymptomatic nodule that contains a central plug of keratin. When fully developed, the keratoacanthoma contains a core of keratin surrounded by a concentric collar of raised skin. Over the next 4$\sim$8 weeks, static lesion persists. Then undergoes spontaneous regression over the next 6$\sim$8weeks period by expulsion of the keratin core with resorption of the mass. In histologic feature, Keratoacanthoma consists of hyperplastic squamous epithelium growing into the underlying connective tissue. The surface is covered by a thickened layer of parakeratin with central plugging. Epithelium cell shows dysplastic features and the margins the normal adjacent epithelium is elevated. The differential diagnosis includes SCC. Keratoacanthoma present as a exophytic lesion with horny keratin occupying a depression on the top of the lesion, persists static period and undergoes rapid growth compared with SCC. Keratoacanthoma is usually treated by surgical excision or curettage of the base, spontaneous regression does not occur in every case. A 60 years old male who present facial lesion visit our hospital and surgical excision was done. Biopsy result was keratoacanthoma. We report case with review of literatures.
수분 함유량 및 지하 구조물 깊이에 따른 고고도 전자기파(HEMP) 투과 현상 분석
강희도(Hee-Do Kang),오일영(Il-Young Oh),육종관(Jong-Gwan Yook) 한국전자파학회 2013 한국전자파학회논문지 Vol.24 No.6
본 논문에서는 지하 다층 구조물로 경사 입사하는 고고도 전자기파의 투과 현상을 위한 전자기적 모델링 기법과 편파 및 임계각을 고려한 모델링 기법을 제안하였다. 고고도 전자기파의 전송 채널인 지하 다층 구조물은 측정된 복소 유전율을 바탕으로 지하 터널층으로 투과된 고고도 전자기파를 정량적으로 계산하였으며, 입사파의 편파와 임계각을 고려하여 투과 현상을 분석하여, 평행 편파를 갖는 고고도 전자기파가 수직 편파를 갖는 경우보다 더욱 큰 투과 현상이 발생함을 확인하였다. 또한, 수직 입사의 경우, 편파에 상관없이 약 5.6 ㎸/m의 전기장이 투과함을 확인하였으며, 지하 다층 구조물에서의 임계각인 38도 근처에서 매우 급격한 전기장의 감쇠를 확인하였다. 이를 바탕으로, 지하 다층 구조물을 구성하는 토양층의 수분 함유량 변화 및 각 층의 깊이에 따른 고고도 전자기파의 투과 현상을 정량적으로 분석하여, 지하 터널층의 방호 설계 시 물리적인 깊이에 대한 고려뿐만이 아닌 추가적인 방호 설계에 대한 고려가 불가피함을 소개하였다. In this paper, a formulation for obliquely incident electromagnetic wave has been presented for an analysis of highpower electromagnetic pulse penetration into multilayered dispersive media. Based on generalized models of measured dielectric constants and propagation channels reflecting the Earth"s general features, the propagation phenomenon of the obliquely incident early-time(E1) high altitude electromagnetic pulse(HEMP) is analyzed. In addition, the polarization and critical angle are also considered. It is found that the total reflection occurs at an incident angle of about 38 degrees at the soil-rock interface, and that the parallel-polarized E1 HEMP penetrates better than the perpendicular-polarized one. The peak level of the penetrating electric field is found to be 5.6 ㎸/m at normal incidence, regardless of the type of polarization, and E1 HEMP is greatly reduced near the critical angle. Moreover, the penetrating E1 HEMP is analyzed as a variation of moisture content and depth of materials, resulting E1 HEMP could be useful in determining the levels of shielding required for buried facilities.
2차원 비정렬 격자에서의 내재적 기법을 이용한 난류 유동 계산
강희정(Hee Jung Kang),권오준(Oh Joon Kwon) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
An implicit viscous turbulent flow solver is developed for two-dimensional geometries on unstructured triangular meshes. The flux terms are discretized based on a cell-centered finite-volume formulation with the Roe's flux-difference splitting. The solution is advanced in time using an implicit backward-Euler time-stepping scheme. At each time step, the linear system of equations is approximately solved with the Gauss-Seidel relaxation scheme. The effect of turbulence effects is approximated with a standard k-ε two-equation model which is solved separately from the mean flow equations using the same backward-Euler time integration scheme. The triangular meshes are generated using an advancing-front/Iayer technique. Validations are made for flows over the NACAOO12 airfoiI and the Douglas 3-element airfoil. Good agreements are obtained between the numerical results and the experiment.
2차원 비정렬 격자에서의 내재적 기법을 이용한 난류 유동 계산
강희정(Hee Jung Kang),권오준(Oh Joon Kwon) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.2
An implicit viscous turbulent flow solver is, developed for two-dimensional geon unstructured triangular meshes. The flux terms are discretized based on a cell-centered formulation with the Roe's flux-difference splitting. The solution is advanced in time us backward-Euler time-stepping scheme. At each time step, the linear system of approximately solved with the Gauss-Seidel relaxation scheme. The effect of turbulence is with a standard k-ε two-equation model which is solved separately from the mean flow equation the same backward-Euler time integration scheme. The triangular meshes are generated advancing-front/layer technique. .Validations are made for flows over the NACA 0012 airfc Douglas 3-element airform. Good agreements are obtained between the numerical result experiment.
3차원 비정렬 격자를 이용한 항공기 형상 주위의 유동해석
강희정(Hee Jung Kang),권오준(Oh Joon Kwon) 한국전산유체공학회 1996 한국전산유체공학회 학술대회논문집 Vol.1996 No.-
Inviscid compressible flows over civil transport aircraft configurations are calculated using three-dimensional unstructured tetrahedral meshes. The equations are integrated in time with an explicit multi-stage Runge-Kutta time-stepping algorithm. The flux terms are discretized based on a cell-centered finite-volume formulation with the Roe's flux-difference splitting. The tetrahedral meshes are generated using an advancing-front technique. Validations are made for flows over the ONERA M6 wing and RAE wing-body geometries. Good agreements are obtained between the numerical results and the experiment. The numerical technique is also applied for the K-100 civil transport configuration.