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서성일,송시헌,김성호,김관태,김윤 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.2
The clinical analysis was carried out with 182 cases of craniocerebral injuries under 15 years of age, admitted at the Department of Neurosurgery, Chung Nam National Universty Hospital during the period from September, 1990 to September 1993. Following results were obtained : 1) There were 133 males and 49 females and sex ratio was 2.7% 2) Age incidence of the accidents was greatest at 6 years of age and mostly distributed to the age group between 4 to 7. 3) Seasonal peak of the accidents was at May. 4) The accident occurred mostly botween 4 P.m. and 6 P.m in a day.5) The most frequent cause of the craniocerebral injuries was traffic accident(105cases, 57.69%) 6) No deterioration of cansciousness before and after the admission was doserved in 68cases(37.36%) 7) Pupillary change was observed in 25 cases and Babinski sign was elicitable in 31cases 8) Early convulsion and vomiting were frequent symptoms in childhood. 9) Skull fracture was observed in 72 cases(39.56%) in which linear fracture was most frequent and predilection site was parietal bone. 10) The accompanying rate of skull fracture in intracranial hemorrhage was 65.54% 11) Associated injures were found in 44 cases(24.18%). The frequent ones were e xtremity fracture, clavicle fracture 12) The overall mortality was 7.14%.
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도금 처리된 SS41, SM45C강의 피로한도에 관한 연구
김현집,성관제 동국대학교 산업기술연구원 1996 산업기술논문집 Vol.8 No.-
본 논문에서는 크롬 또는 아연이 20 및 40㎛의 두께로 도금된 SS41 연강과 SM45C 탄소강의 피로한도에 관한 특성을 연구하기 위하여 회전-굽힘 시험을 실시하였다. 피로한도는 오노식 회전-굽힘 피로 시험기에서 약 10^6회의 반복 하중 상태에서 구하였다. 시험 결과 SS41과 SM45C 모두 도금 처리된 상태가 원래의 모재보다 향상된 피로한도를 나타내었다. SM45C의 도금처리 후 피로한도는 도금재료나 두께에 상관없이 도금처리된 후 약 11%의 향상을 보인 반면, SS41는 도금재료에 따라 다른 경향을 나타내었다. 즉, 크롬 도금처리는 도금재료의 두께에 비례하는 피로한도 향상을 나타낸 반면 (20㎛에서 14%, 40㎛에서 26%), 아연으로 도금한 경우는 오히려 20㎛에서 최고의 효과인 40% 향상을 나타내었고 40㎛에서는 14%에 그쳤다. 이와 같은 현상은 주로 모재와 도금면 사이에서 아연 결정 입자들의 팽창 및 수축과 관련이 있을 것으로 생각된다. 따라서 본 연구에서는 강에 도금처리 하는 것이 부식 방지뿐만 아니라 재료의 피로강도를 상당히 높이는데도 효과가 있음을 입증하였고, 특히 아연도금의 경우 도금재질의 두께에 최적치가 존재함을 보였다. Rotary-bending tests are performed to study the fatigue limit characteristics of SS41 mild steel and SM45C carbon steel coated with 20 or 40㎛ of chrome or zinc. Fatigue limits are determined at about 10^6 cycles of repeated loading on Ono's type rotary bending fatigue testing machine. It is found that the fatigue limits of both SS41 and SM45C increased with coating. The fatigue limit of SM45C shows an increase of about 11% for both chrome and zinc coating irrespective of their thickness. SS41 when coated with chrome shows an increase in its fatigue limit proportional to the plating thickness, about 14% and 26% for coating of 20 and 40㎛ respectively. However when coated with zinc, fatigue limit increased the most at 40% with 20㎛ and only 14% with 40㎛ and it is believed that this phenomenon is related to contraction and expansion of zinc crystal grains at the coating interface. In this study, we verified that plating steel has the duel effect of being more tolerant to corrosive environment and increasing its material strength. Furthermore, we found that for zinc coating there exits an optimal thickness as regarding improvement of steel's fatigue strength.
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김지태,한명애,곽현,배성렬 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1
이취미물질중에서 페놀, Geosmin, 2-MIB를 선정하여 응집제(PACS)와 흡착제(PAC) 및 산화제(Cl2, ClO2)로 처리하였을 때 제거율을 알아보았다. 페놀의 경우 이산화염소(ClO2)와 분말활성탄(PAC)으로 처리하였을 때 제거효율이 높았고, Geosmin과 2-MIB는 분말활성탄(PAC)으로 처리하였을 때 제거효율이 높았다. 그러나 페놀, Geosmin, 2-MIB 모두 응집제(PACS), 염소(Cl2)로 처리하였을 경우에는 제거효율이 거의 없음을 알 수 있었다. The removal ratio of phenol, geosmin, and 2-MIB selected in odor and taste causing materials was investigated, when water was treated with coagulant(PACS), adsorbent(PAC), and oxidants(Cl2, ClO2). Phenol was removed at a relatively higher rate by the treatment with CIO2 and PAC(Powder Activated Carbon). The other side, geosmin and 2-MIB were removed at a higher rate by the treatment with PAC. But it was found that the treatment with coagulant(PACS) and chlorine(Cl2) for the removal of phenol, geosmin and 2-MIB was little removal efficiency.
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김상규,박종관,한성길 동국대학교 산업기술환경대학원 1996 산업기술논총 Vol.3 No.-
국내 해안에 퇴적한 실트질모래와 hydraulic fill한 지반에서 채취한 시료의 액상화강도 측정을 위해 응력제어 반복삼축압축시험을 수행하였다. 이를 위해 1)불교란시료와 교란시료의 액상화강도 산정과 2)등방압밀된 시료와 비등방압밀된 시료의 반복삼축시험결과 비교, 3)본 시험결과와 국내 다른 시험자료 및 외국의 결과를 비교하였다. 불교란시료의 경우 반복횟수 N이 10회 일 때 액상화강도는 교란시료에 비해 약 두 배 정도 크게 나왔다. 비등방압밀된 시료의 액상화강도는 수직응력을 구속응력으로 나눈 유효압밀비에 영향을 받는다. 유효압밀비가 증가함에 따라 액상화 강도는 증가하여, 유효압밀비가 1.2와 1.5인 경우 유효압밀비가 1인 경우보다 각각 24%와 56% 정도 증가되었다. 본 시험결과는 국내 다른 연구자들의 시험과 비교했을 때 같은 상대밀도에서 약간 큰 경향을 나타냈으며, Seed and Idress(1971)가 제안한 입경별 액상화강도 추세선으로 비교하였을 때도 약간 큰 강도를 보이고 있다. Dynamic triaxial tests were performed in order to evaluate the liquefaction potentials of silty sands and hydraulic fill ground. In the tests, (1) undisturbed and disturbed samples were prepared for the tests, (2) dynamic shear strengths were measured under isotropic and anisotropic condition and (3) the test results were compared with the other results which were tested by domestic and foreign researchers. The test results of undisturbed samples showed the dynamic shear strength twice larger than those of disturbed samples at the 10 cycles loading. The dynamic shear strength of anisotropically consolidated samples were affected by the effective consolidation ratio which is the rate of vertical effective stress divided by confining stress. The dynamic shear strength at the effective consolidation ratio of 1.2 and 1.5 increased by 24% and 56%, respectively, comparing to the strength at the ratio of 1. These test results showed that the dynamic strengths were a little larger than those of other domestic researchers, and Seed and Idress(1971).
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김성호,송시헌,김관태,김윤 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.2
Authors experienced 36 surgical cases of pyogenic central nervous system infections including brain abscess, subdural empyema, skull osteomylitis with epidural abscess, intraspinal abscess and other rare infections. The incidence was hightest in the 5th and 6th decade, and male patients were predominant. About 56% of the CNS infections were occured after opdraions. The most common causative organisms were staphylococcus aureus. WBC count, ESR and body temperature were not diagnostic in CNS infections. No patient died among the brain abscess cases and the overall mortality rate of CNS infections was 8%.
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