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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%.
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.
Response Matrix 에 의한 감마線 Spectrum 및 그 照射線量 解析
金成冠,田載植 대한방사선 방어학회 1986 방사선방어학회지 Vol.11 No.1
3'×3' 원통형 NaI(T1) 검출기와 多重波高分錫器를 사용하여 측정한 0.05~2.0MeV 구간의 γ선 spectrum에서 實spectrum을 구하기 위하여 照射線量率산출에 편리한 response matrix방법을 사용하였다. Response matrix구성에는, 위의 에너지 구간을 0.1MeV의 등간격으로 나눈 20×20 matrix로 한것과 검출기의 분해능이 입사 γ선 에너지의 平方根에 의존한다는 가정하에 0.1(MeV)?구간으로 나누어 14×14matrix로 구성한, 두가지 방법을 사용하였으며 그 逆matrix들은 P-E82/32콤퓨터로 계산하였다. 이 방법으로 얻은 조사선량율은 에너지와 flux가 알려진 γ선場에 대하여 흔히 사용되는 계산방법으로 구한값과 10% 이내에서 일치하고 있으며, 線量測定學的 견지에서는 E? 구간으로 형성된 matrix가 등에너지간격으로 구성된 것보다 현실적인 것으로 판단되었다. A study has been carried out for figuring out real photon spectrum from an observed gamma-ray spectrum by means of response matrix method, which is known ofe of the relatively convenient method for the estimation of exposure rate of a complex gamma ray field in comparison with graphical analysis and least square fitting of the measured spectrum. A 3"×3" cylindrical Nal(T1) scintillation detector in association with multichannel pulse height analyzer and six reference gamma ray sources covering the photon energy range of 0.05 to 2.0 MeV were used. In dividing the energy region for the construction of response matrix, two different approaches were attempted. One is dividing the entire energy region of interest into 20 bins, one of which corresponds to a width of 0.1 MeV to form 20×20 matrix, and another is dividing the 2MeV region into 14 bins to form 14×14 matrix consists of 0.1(MeV)? Intervals assuming the resolution of the detector is dependent on square root of the incident photon energy. Inversion of thus constructed matrices was performed by a computer(P-E8/32) using the program attached to the end of this paper. The resultant exposure rates obtained by this method were in good agreement, within 10% with those calculated by ordinary formula widely used for a gamma-ray field of known energy and flux. It is concluded that the photen flux obtained by the response matrix constructed under the assumption of E? dependence is more realistic than that obtained by the matrix consist of identical energy bins in dosimetrical point of view.
포러스콘크리트의 기초물성에 미치는 시멘트페이스트의 유동성 및 진동다짐시간의 영향에 관한 실험적 연구
김무한,백용관,최영욱,강석표,김재환,이성일 忠南大學校 産業技術硏究所 2001 산업기술연구논문집 Vol.16 No.2
This study analyzed the influence of paste fluidity and vibration time for fundamental properties of porous concrete. Results of this study were shown as follows: 1) Even if target void ratio is same, void ratio and compressive strength of porous concrete is different according to w/c, paste flow and vibration time. So, In case of target void ratio, we must consider the influence of w/c, past flow and vibration time. 2) Though w/c and vibration time is same, as paste flow increase, all void ratio, continuous void ratio, and compressive strength decrease and difference between upper and lower void ratio increase. 3) Though w/c and paste flow is same, as vibration time increase, all void ratio and continuous void ratio decrease and difference between upper and lower void ratio increase. Also, compressive strength increase by 10 seconds and decease after 10 seconds. 4) As types of superplasticizer is different, all void ratio, continuous void ratio, and compressive strength is different. So, we must give consideration to paste fluidity and vibration time in order that increase of strength of porous concrete and distribution of uniform void.
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%.