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지구통계학적 기법에 의한 강원폐광부지 중금속의 공간적 분포 양상 예측 연구
김순아,이우균,김정규,신기일,권태협,현승훈,양재의 대한공간정보학회 2012 Spatial Information Research Vol.20 No.4
This study was performed to evaluate the spatial distribution of heavy metals using principal component analysis and Ordinary Kriging technique in the Gangwon Mine site. In the soils from the sub soil, the contents of Zn and Ni in the PC1 were gradually dispersed from south to north direction, while the components of Cd and Hg in the PC2 showed an increase significantly from middle-south area in the Gangwon Mine site. According to the cluster analysis, pollutant metals of As and Cu were presented a strong spatial autocorrelation structure in cluster D. The concentration of As was 0.83mg/kg and shown to increase from the south to north direction. The spatial distribution maps of the soil components using geostatistical method might be important in future soil remediation studies and help decision-makers assess the potential health risk affects of the abandoned mining sites. 본 연구는 한강중상류유역에 위치한 강원광산부지로부터 발생한 중금속의 오염Urban Heat Island, 3-D City Model, Spatial Statistics실태를 파악하고자 주성분 분석과 크리깅 공간통계기법을 시도하였다. 토양 심토에서 제1 주성분(PC1)의 경우 광산주변의 정남쪽방향에서 정북방향으로 아연과 니켈의 농도가 점진적으로 확산되고 있었으며 제2 주성분(PC2)은 강원광산 중남부지역에서 카드뮴과 수은 함량의 농도가 높게 나타났다. 클러스터 분석결과, D 그룹에서 비소와 구리 금속이 공간자기상관관계가 높게 나타났으며 비소의 경우 중금속 농도가 0.83mg/ kg로 남에서 북쪽방향으로 증가하였다. 본 연구는 크리깅모델을 이용하여 광산부지로부터 오염토양의 중금속 분포 현황을 공간학적으로 파악할 수 있었고 향후 휴·폐광부지에서 위해성평가 및 정책당국의 결정권자들에게 오염토양 복원에 대한 의사결정시 도움이 될 것이다.
김신기,홍정화,김경훈,문무성,이순걸,백영남 대한의용생체공학회 2001 의공학회지 Vol.22 No.1
본 연구의 목적은 대퇴부가 절단된 다리의 생체 역학적 기능을 복구할 수 있게 하는 의지의 개발을 위하여 5축 링크, 슬관절 완충장치를 사용하여 보행시 입각기를 제어할 수 있는 대퇴 의지 시스템 개발에 있다. 이를 위하여 입각기시 대퇴의지와 지면간 접촉 중 충격 에너지 흡수를 하는 슬관절 완충장치의 기계적 특성 및 거동을 분석하였다. 임상시험을 통하여 개발된 대퇴의지의 성능을 검증한 결과 대퇴 절단 피검자들의 보행특성은 정상인의 보행에 근접한 경향을 보였다. 결론적으로 본 연구에서 개발된 입각기 대퇴의지는 입각기시 현저한 보행 안전성을 보였다.
김신기,이창희,김경아,최재웅,이종미,박철민 대한자기공명의과학회 2008 Investigative Magnetic Resonance Imaging Vol.12 No.2
Purpose : To evaluate the correlation between the radiological non-invasive hepatic fibrosis index (RNHFI), as determined by SPIO-enhanced MRI, and the laboratory non-invasive hepatic fibrosis index. Materials and Methods : Patients (99 total: 61 men and 38 women; mean age: 58 years) who underwent SPIO-enhanced MRI (1.5T) during 5 years included. These patients were subdivided into a liver cirrhosis group (LCG) and a non-liver cirrhosis group (non-LCG). Using PACS view, we measured the RNHFI (mean standard deviation of hepatic signal intensity (SD), noise-corrected coefficient of variation (CV)) of three ROIs in the liver parenchyma by SPIO-enhanced MRI. The laboratory non-invasive hepatic fibrosis index (AST-platelet ratio index (APRI)) of all patients was calculated from the laboratory data. We compared the RNHFI and APRI of LCG with those of non-LC group using Student’s t-test. A bivariate correlation was performed to investigate the relationship between the RNHFI and APRI in the LCG. Results : For the LCG, mean values of SD and CV by SPIO-enhanced MRI were 10.3±3.7 and 0.19±0.08, respectively. For the non-LCG, mean values of SD and CV were 6.5±1.6 and 0.08±0.05, respectively. The mean APRI of the LCG and the non-LCG were 2.04±1.7 and 0.32±0.32, respectively. The RNHFI and APRI were significantly different between both groups (p<0.05). For the LCG, the bivariate correlation between SD and APRI revealed a statistically significant positive correlation (r=0.5, p<0.001). In both groups, there was no statistically significant correlation between CV and APRI. Conclusion : A measurement of SD can be a simple and useful method for the evaluation of hepatic fibrosis.
SO_(2) 가스에 의한 Fe-Ti-C合金의 高溫酸化에 關한 硏究
김신기,오택열,백영남 慶熙大學校 材料科學技術硏究所 1990 材料科學技術硏究論集 Vol.3 No.-
The high temperature oxidation reaction of Fe-Ti-C alloys was investigated in 1 atmospheric SO_(2) gas pressure at temperature range 600℃ to 800℃. The oxidation rate of the alloys was determined by a thermogravimetry analysis. The structure and the composition of the reaction products were identified by aid of SEM, EDS analysis and X-ray diffraction technique. The overall reaction process obeyed a parabolic rate law at the temperature range 600℃ to 800℃, in which the reaction rate increased with an increase in the temperature. An increase in the reaction rate results mainly from the poor adherence and cracks of the scale from the growth stress in the scale and the evoultion of CO_(2)(orCO) gas between the scale and alloy. The scales consisted of several layers of Fe_(2)O_(4), α-Fe_(2)O_(3) and TiO_(2)