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배우석(Woo-Seok Bae),권영철(Young-cheul Kwon),김종우(Jong-Woo Kim) 한국암반공학회 2007 터널과지하공간 Vol.17 No.5
노천광산이나 도로ㆍ철도의 대절토사면 등은 급경사지를 형성하며 대부분이 토양층을 포함하지 않는 암반층으로 구성되어 있다. 그러나 암반 비탈면은 풍화와 파쇄가 발달해 있으며 경사가 심하여 표면침식에 의한 탈락과 붕괴가 빈번히 발생되고 있다. 이러한 암반 비탈면의 붕괴억제 등 토압의 지지를 위해 가장 널리 쓰이는 토류 구조물로는 현장 타설식 콘크리트 옹벽이나 석축 등이 있으며, 기존의 옹벽이 가지고 있는 문제점을 극복하기 위해 개발되고 있는 구조물로 기성 부재를 결합하여 시공하는 조립식 격자옹벽이 사용되고 있다. 본 연구에서는 조립식격자옹벽의 변형거동을 평가하기 위해 배면 strecher의 형상과 벽체의 높이와 경사에 따른 실내모형 실험을 수행하였다. 모형실험을 통해 옹벽경사의 변화에 따른 상대적인 변위를 측정하고 위치별 변위 특성을 분석하였다. 또한 옹벽을 구성하는 header와 strecher 중 상부하중 전달의 역할을 수행하는 rear strecher의 유ㆍ무와 rear strecher의 형태에 따른 옹벽의 거동특성, 옹벽 배면채움재의 변위 특성 및 작용점의 위치를 측정하고 조립식격자 옹벽의 하중-변위 특성을 관찰하였다. 실험결과 조립식 격자 옹벽의 파괴는 옹벽의 높이가 감소함에 따라 파괴하중이 급격히 증가하고 최대변형률의 크기가 크게 감소하였다. 또한 동일한 경사와 높이에서 rear strecher의 형태는 최대수평변위 발생위치와 변형의 크기에 크게 영향을 주지 않으며 벽체의 경사에 더 큰 영향을 받고 있는 것으로 나타났다. Most large cut slopes of open pit mines, roadways, and railways are steeply inclined and composed with rocks that do not contain soils. However, these rock slopes suffer both weathering and fragmentation. In the case of steep slopes, falling rock and collapse of a slope may often occur due to surface erosion. Cast-in place concrete and rubble work are the most widely used earth structure-based pressure supports that act as restraints against the collapse of the rock slope. In order to overcome the shortcomings of conventional retaining walls, a segmental grid retaining wall is being used with connects precasted segments to construct the wall. In this study, laboratory model test was conducted to estimate deformation behavior of segmental grid retaining wall with configuration of rear strecher, height and inclination of the wall. In order to examine the behavior characteristics of a segmental grid retaining wall, this research analyzes the aspects of spacial displacement through relative displacement according to change in the inclination of the wall. Also, the walls behavior according to the formation and status of the rear stretcher which serves the role of transferring the load from the header and the stretcher which make up the wall, the displacement of backfill materials in the wall, and the location of the maximum load were surveyed and the characteristics of displacement in the segmental grid retaining wall were observed. The test results of the segmental grid retaining wall showed that there was a sudden increase in failure load according to the decrease in the wall's height and the size of the strain was greatly decreased. Furthermore, it revealed that with identical inclination and height, the structure of the rear stretcher did not greatly affect the starting point or size of maximum horizontal displacement, but rather had a stronger effect on the inclination of the wall.
배병철,최창화,이영우 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.10
Traumatic carotid-cavernous fistula(CCF) is a rare complication of moderate to severe head injury. A series of 15 traumatic carotid-cavernous fistulas has been analyzed and 13cases have been treated with 3 different methods : direct obliteration through pterional approach(5cases). ligation of internal. common and external carotid artery in the neck(2cases). occlusion of CCF with detachable balloon technique(6cases). The remaining 2cases were treated by conservative procedures. There were 12cases(80%) with skull fractures. the majority of which(10cases) had frontal vault and basal skull fractures. The results of each method were as follows : 1) Among the 5 direct obliteration procedure groups. we got satisfactory results in only 2 cases(40%), and the other 2cases needed additional instantaneous carotid trapping procedures. which corrected the fistula. Internal carotid artery patency was also preserved in cases(40%). 2) Among the 2cases of carotid trapping group only 1case(50%) improved to good. 3) Among the datachable balloon group 5cases(83.3%) recovered to good or corrected. Carotid patency was preserved in 4cases(67.7%). As a result initial treatment modality of CCF should be datachable balloon technique because of good preservation of carotid patency. better result. simplicity. and safety compared with other operative methods.
경수에 발생한 원발성 흑색종 : 증례보고 Case Report
배병철,송근성,차승헌,박동준,최창화,이영우 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.9
The primary melanoma of spinal cord was rarely reported in the literatures. The authors report a case of primary spinal maligmant melanoma in the cervical spinal cord. A 41-year-old man presented several months history of right shoulder pain and right hemiparesis. Plain X-ray of the cervical spine. myelography. computerized tomography and magnetic resonance imaging showed intradural mass from third to fifth cervical spine level. The operation was perfomred. and intradural intra- and extramedullary brownish black tumor, which focally infiltrated to the dura and inner surface of lamina, was removed and the histological diagnosis was maligmant melanoma. And then chemotherapy with vincristine, bleomycin, cisplatine, followed by whole central nervous system radiation therapy was performed. The patient was discharged and followed up with no neurological interval change. The pertinent literature of spinal cord melanoma is reviwed and its rareness is discussed.