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Intracranial Erdheim-Chester Disease
유남훈,이기택,최찬영,황충진 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.36 No.6
Erdheim-Chester disease is a rare form of non-Langerhans cell histiocytosis consisting of disseminated xanthogranulomatous infiltration and fibrosis that involves the long bones, visceral organs, orbital, retroperitoneal and soft tissues. Intracranial involvement is very rare, although the most common site is extra axial if it occurs. In our case study, a 53-year-old woman with one-month history of left hemianopsia was examined and treated. Her initial T2-weighted MRI revealed increase in signal intensity and an irregularly enhanced mass following gadolinium injection in the right temporal lobe. Stereotactic biopsy was done, and histopathological diagnosis was Erdheim- Chester disease, consist of sheets of foamy histiocytes with abundant cytoplasm. The patient was treated with oral corticosteroid for 4 weeks. During next 6 months, the clinical picture and the MRI showed improvements.
유남훈 ( Nam Hoon Yoo ),한성록 ( Seong Rok Han ),윤상원 ( Sang Won Yoon ),이기택 ( Gi Taek Yee ),최찬영 ( Chan Young Choi ),손문준 ( Moon Jun Sohn ),황충진 ( Choong Jin Whang ) 대한뇌종양학회 2005 대한뇌종양학회지 Vol.4 No.2
Object£ºLateral ventricular tumors are rare lesion of the central nervous system. We conducted a retrospective study of patients with these lesion treated on surgically. Methods£ºTotal 9 cases of lateral ventricular tumors, who underwent operative removal between 2001 and 2004 at our hospital were reviewed. There were 3 cases located in the trigone, 3 in the frontal horn, and 3 in the ventricular body. Tumors were removed by various surgical approaches according to the location of tumors. Transcortical approach was used in 7 patients, and transcallosal approach was used in 2 patients. Results£ºTotal resection was performed in 6 patients. Surgical complications included epidural hematoma, subdural hygroma, intracranial hemorrhage, and seizure. Seven patients were achieved good recovery. Conclusion£ºTo improve surgical outcome and to avoid complications, proper knowledge of intraventricular anatomy and selection of an appropriate surgical approach are needed.
공간구문론을 이용한 근린공원 시각적 접근기회 분석- 청주시를 중심으로 -
이태호,반영운,유남훈,Lee, Tae-Ho,Ban, Yong-Un,Yoo, Nam-Hoon 한국조경학회 2011 韓國造景學會誌 Vol.39 No.4
본 연구의 목적은 도시 근린공원을 대상으로 주변 공간의 가로망 형태에 따른 공원의 시각적 접근기회를 분석하는 것이다. 분석을 위해 도보로 이용이 가능한 도보권 및 근린 생활권 공원 27곳을 최종 선정하였다. 공원을 중심으로 각 유치거리에 따라 GIS를 이용하여 영향권을 설정(buffering)하였으며, 설정된 구역에서의 공간배열 특성을 가로망 중심으로 파악하고 공간구문론을 이용하여 분석하였다. 본 연구수행을 위해 Arcview 기반의 Axwoman Ver3.0프로그램을 활용하였다. 공간구문론에서 제시하는 연결도, 통합도 등의 지수를 통해 공원의 접근기회를 파악하였으며, 정량적 수치들이 가지는 의미는 관련 문헌고찰을 통해 해석하였다. 연구 결과는 공원 유치거리에 따른 공간의 전체적인 배열 특성에 대해서는 통합도, 명료도 값을 활용하였으며, 각 공원의 주출입구 공간은 연결도, 통합도 값을 이용해 분석했다. 분석 결과, 전체공간에서는 대부분의 통합도 값이 2보다 낮았으나, 명료도의 경우 0.7이상의 값을 가진 공원이 10곳으로 나타났다. 공원의 주출입구 공간에 대한 접근기회는 주출입구 공간의 통합도를 중심으로 살펴봤으며, 도보권 공원에서는 사직 2공원이, 생활권 근린공원에서는 중앙공원과 발산공원 등이 상대적으로 접근기회가 높은 것으로 분석되었다. 본 연구는 기존의 공원 접근성에 관한 연구가 시점과 종점간의 물리적 거리 및 환경에 초점이 맞춰져 있는데 반해, 공원을 둘러싼 공간 배열 특성을 고려한 접근성 분석이 이루어졌다는데 의의가 있다. 이러한 결과는 도시공원의 입지계획에 있어 합리적 근거를 부분적으로 제공해 줄 것으로 기대된다. This study analyzes the visual access opportunities of neighborhood park users using the Space Syntax theory. In order to achieve this goal, 27 neighborhood parks were selected and 27 axial maps drawn according to the spatial configuration of the sites. Based on the axial map data, this study has calculated some specific space syntax indices, including Connectivity, Integration, and Intelligibility using the Axwoman ver 3.0 based on the Arcview 3.2 application. The value of the representative indices were used to examine visual access opportunities presented by the parks. This study was conducted in two aspects: one focusing on the entire space and another focusing on only the main entrance of the parks. The former used integration and intelligibility values and the latter used connectivity and integration values to evaluate the visual access opportunities of the sites. As a result, this study found that some parks, including Joongang, Balsan, and Sangdang, have high visual access opportunities in terms of the spatial configuration surrounding the park, which shows an integration value higher than 2, and also having intelligibility values higher than 0.7. This is the result of the grid land use pattern surrounding the parks and the straight roads that are closely linked to the main entrances of the parks. It is expected that this methodology and results will be used for locating neighborhood parks during the urban planning stage as providing reasonable evidence.
박진규,이원재,김용준,이남훈,유문현 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.8
The IPCC methodology for estimating methane emissions from a solid waste landfill is based on the first order decay (FOD) method. One emission factor in the model is the methane generation potential (L0) that is estimated from the amount of decomposable degradable organic carbon (DOC) in a solid waste landfill. L0 is estimated based on the fraction of DOC in the waste, the fraction of the degradable organic carbon that decomposes under anaerobic conditions (DOCf), methane correction factor (MCF), and the fraction of methane in generated landfill gas (F). The other emission factor is the methane generation rate constant (k). The IPCC recommended that every country needs to develop country-specific key parameters (DOC, DOCf, k) more appropriate for its circumstances and characteristics. The objective of this research was to investigate the greenhouse gas emission factor (k) and parameters (DOC, DOCf) for wood wastes in a solid waste landfill. To investigate DOC, DOCf, and k for wood wastes, the biodegradable rate of wood wastes was determined by comparing the composition of excavated samples (L-1, L-2) with their fresh ones (F-1, F-2). The DOC values were found to be 48.36% and 45.27% for F-1 and F-2, respectively. It showed that the IPCC default value of DOC for wood wastes is appropriate for estimating methane emission. The maximum DOCf (0.17 and 0.18) or each wood waste excavated from G landfill was found to be lower compared with those for IPCC. The IPCC provided that default values of DOCf 0.5. The k values were found to be 0.0055 and 0.0058 year−1 for F-1 and F-2, respectively. The result confirmed that the biodegradation rate of wood wastes was very slow due to its lignin.