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        • 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)

        • KCI등재
        • SCOPUSKCI등재

          입각기.유각기 동시제어식 대퇴의지의 개발

          김신기,김경훈,문무성,이순걸,백영남,Kim,,Sin-Gi,Kim,,Gyeong-Hun,Mun,,Mu-Seong,Lee,,Sun-Geol,Baek,,Yeong-Nam 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.4

          In this study, a transfemoral prosthesis system of which both stance phase and swing phase are controllable has been developed for the recovery of the biomechanical function of the amputated leg. It consists of a 5 bar link mechanism, a hydraulic-rubber knee damper for stance phase control and a pneumatic cylinder controlled via a microprocessor for stance phase control. The mechanical characteristics of the knee damper which absorbs the impact energy generated at the heel contact were investigated. The characteristics of the pneumatic cylinder essential for the speed adaptation of the prosthesis during swing phase were also studied for its mechanical characteristics. The prosthesis was subject to the clinical tests, and the gait characteristics obtained were very close to those of normal subjects. The stance and swing controlled prosthesis that were developed in this study showed good stability during the stance phase and showed good controllability during the swing phase.

        • KCI등재

          5축 링크를 이용한 입각기 제어 대퇴의지의 개발

          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.

        • KCI등재

          Sonographically Detected Architectural Distortion: Clinical Significance

          김신기,서보경,이안,차상훈,김백현,조규란,김영식,손길수,김영수,김희영 대한초음파의학회 2008 ULTRASONOGRAPHY Vol.27 No.4

          PURPOSE : Architectural distortion is a suspicious abnormality for the diagnosis of breast cancer. The aim of this study was to investigate the clinical significance of sonographically detected architectural distortion. MATERIALS and METHODS : From January 2006 to June 2008, 20 patients were identified who had sonographically detected architectural distortions without a history of trauma or surgery and abnormal mammographic findings related to an architectural distortion. All of the lesions were pathologically verified. We evaluated the clinical and pathological findings and then assessed the clinical significance of the sonographically detected architectural distortions. RESULTS : Based on the clinical findings, one (5%) of the 20 patients had a palpable lump and the remaining 19 patients had no symptoms. No patient had a family history of breast cancer. Based on the pathological findings, three (15%) patients had malignancies. The malignant lesions included invasive ductal carcinomas (n = 2) and ductal carcinoma in situ (n = 1). Four(20%) patients had high-risk lesions; atypical ductal hyperplasia (n = 3) and lobular carcinoma in situ (n = 1). The remaining 13 (65%) patients had benign lesions, however, seven (35%) out of 13 patients had mild-risk lesions (three intraductal papillomas, three moderate or florid epithelial hyperplasia and one sclerosing adenosis). CONCLUSION : Of the sonographically detected architectural distortions, 35% were breast cancers or high-risk lesions and 35% were mild-risk lesions. Thus, a biopsy might be needed for an architectural distortion without an associated mass as depicted on breast ultrasound, even though the mammographic findings are normal. PURPOSE : Architectural distortion is a suspicious abnormality for the diagnosis of breast cancer. The aim of this study was to investigate the clinical significance of sonographically detected architectural distortion. MATERIALS and METHODS : From January 2006 to June 2008, 20 patients were identified who had sonographically detected architectural distortions without a history of trauma or surgery and abnormal mammographic findings related to an architectural distortion. All of the lesions were pathologically verified. We evaluated the clinical and pathological findings and then assessed the clinical significance of the sonographically detected architectural distortions. RESULTS : Based on the clinical findings, one (5%) of the 20 patients had a palpable lump and the remaining 19 patients had no symptoms. No patient had a family history of breast cancer. Based on the pathological findings, three (15%) patients had malignancies. The malignant lesions included invasive ductal carcinomas (n = 2) and ductal carcinoma in situ (n = 1). Four(20%) patients had high-risk lesions; atypical ductal hyperplasia (n = 3) and lobular carcinoma in situ (n = 1). The remaining 13 (65%) patients had benign lesions, however, seven (35%) out of 13 patients had mild-risk lesions (three intraductal papillomas, three moderate or florid epithelial hyperplasia and one sclerosing adenosis). CONCLUSION : Of the sonographically detected architectural distortions, 35% were breast cancers or high-risk lesions and 35% were mild-risk lesions. Thus, a biopsy might be needed for an architectural distortion without an associated mass as depicted on breast ultrasound, even though the mammographic findings are normal.

        • KCI등재후보

          Evaluation of Fibrosis in Liver Cirrhosis by Superparamagnetic Iron Oxide (SPIO)-Enhanced MR Imaging: Does the Radiological Non-Invasive Fibrosis Index Correlate with the Laboratory Non-Invasive Fibrosis Index?

          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. 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.

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