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원호 해석법을 적용한 점성토사면의 3차원 해석에 관한 연구
김팔규,맹창환 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2
Soil is one of the material that have been used for civil engineering. Soil slope is constructed unavoidably because fill and cut is repeated during construction. If most of structure is destroyed, it causes great loss of life and economic loss. Especially, the stability of soil slope is very important because most of structure has a soil slope. However, Though a study about stability of soil slope has been advanced, soil slope is being destroyed continuously. In fact, a precise analysis of slope failure is impossible because, slope failure has a very complicated and combined mechanical relation. So, many scholars and civil engineers have analyzed a stability of slope by 2-D plane on the basis of plane-strain condition. It means that failure of slope occurs equally on any section of soil slope but, very important fact is failures have a finite width and shape of failure and mechanical relations are different for location of section. Therefore, 3-D spatial idea must be introduced to modeling for probable analysis of slope stability. In this study, an assumption that failure block is a part of sperical shape which has an arbitrary center point and radius is introduced and the computer program, 3DSSA(3-Dimensional Slope Stability Analyzer), is developed on the basis of the circular arc method(∮=0 method). For using 3DSSA, the chart of 3-D stability number is made for many geometrical conditions of cohesive soil slope that pore water pressure is not considered. Through the analysis of finite simple cohesive soil slope, the results obtained by means of the computer program 3DSSA show that: 3-D factor of safety is 1.41 times larger than 2-D factor of safety for most case of soil slope. 3-D stability number converges at 0.128 as angle of slope increase from 7.5。 to 60。. When angle of slope is 60。, 2-D stability number calculated by 3DSSA is smaller than Taylor's(1948) by 5.6 percent. The changes of cohesion and unit weight of soil affect little the ratio of 3-D factor of safety to 2-D factor of safety.
맹창환(Chang Hwan Maeng),윤동구(Dong Gu Yun),김춘동(Choon Dong Kim),노영수(Young Soo Rho) 대한두경부종양학회 2002 대한두경부 종양학회지 Vol.18 No.1
Malignant melanoma of the nasal cavity occurs rarely. Malignant melanoma, originated from the upper respiratory tract including nasal cavity, has clinical feature of local recurrence and easily metastasizes to regional or distant lymph nodes, lung, and liver. Malignant melanoma originated from nasal cavity frequently shows tumor cell invasion, ulceration, or infection. Owing to these characteristics, complete surgical excision of the malignant melanoma in nasal cavity is not easy. And also the prognosis of this tumor is not so good because of a high recurrence rate. Recently the authors have recently experienced a case of malignant melanoma originated from the inferior turbinate, which was treated with lateral rhinectomy, total maxillectomy. The defect developed after surgical extirpation was reconstructed with rotational forehead flap.