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Purpose: Traumatic brain injury (TBI) is the most common cause of pediatric trauma patients came to the emergency department. Without guidelines, many of these children underwent repeat brain computed tomography (CT). The purpose of this study was to evaluate the value of repeat brain CT in children with TBI. Methods: We conducted a retrospective study of TBI in children younger than 19 years of age who visited the emergency department (ED) from January 2011 to December 2012. According to the Glasgow Coma Scale (GCS) and Pediatric Glasgow Coma Scale score of the patients, study population divided in three groups. Clinical data collected included age, mechanism of injury, type of TBI, and outcome. Results: A Total 83 children with TBI received repeat brain CT. There were no need for neurosurgical intervention in mild TBI (GCS score 13-15) group who underwent routine repeat CT. 4 patients of mild TBI group, received repeat brain CT due to neurological deterioration, and one patient underwent neurosurgical intervention. Routine repeat CT identified 12 patients with radiographic progression. One patient underwent neurosurgical intervention based on the second brain CT finding, who belonged to the moderate TBI (GCS score 9-12) group. Conclusion: Our study showed that children with mild TBI can be observed without repeat brain CT when there is no evidence of neurologic deterioration. Further study is needed for establish indication for repetition of CT scan in order to avoid unnecessary radiation exposure of children. [ J Trauma Inj 2015; 28: 149-157 ]
김학곤 ( Hak Gon Kim ), 송현진 ( Hyun Jin Song ), 서영롱 ( Young Long Seo ), 임현정 ( Hyun Jeong Im ), 조호준 ( Ho Jun Jo ), 양우형 ( Woo Hyeong Yang ), 양재경 ( Jae Kyung Yang ), 최명석 ( Myung Suk Choi ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-
국내 바이오매스의 활용도와 효율성을 높이기 위해 산림청 조림권장수종을 포함한 86종의 산림자원에 대하여 화학적 성분을 조사하였다. 각 수종은 NREL의 분석방법으로 저분자화합물, lignin, hemicellulose, cellulose의 함량을 조사하였다. 또한 이들 화학적 조성성분간의 상관관계에 대하여 SPSS 대응표본 T검정을 통하여 조사하였다. 그 결과 국내 자생 목본 수종의 화학적 성분은 매우 큰 차이를 보였다. Extractives의 함량이 가장 높았던 종은 가막살나무였고, lignin의 함량이 가장 높았던 종은 명자나무였다. Hemicellulose 함량이 가장 높았던 종은 서양측백 이였고, 낮은 종은 단풍나무였다. Cellulose의 함량이 가장 높았던 종은 벚나무였다. Lignin의 함량이 높을수록 헤미셀룰로오스와 셀룰로오스의 함량은 감소하는 경향을 보였다. 본 연구 결과는 조림권장수종에 대한 이용성 증대에 기여할 것으로 판단된다. In order to increase the efficiency and utilization of domestically producible biomass, wood chemical component for 86 woody plants was analyzed. Each tree species were collected, mecerated and then quantifiable the content of extractives, lignin, hemicellulose, cellulose using the method of NREL. Further, it was statistical analysed through SPSS corresponding sample T-test for correlation between chemical compositions. As a result, the chemical composition of domestic woody species showed a huge variable according to plant species and chemical component. Among woody plants, extractive content was highest in Viburnum dilatatum and lignin content was high contained in c haenomeles lagenaria. The hemicellulose content was highly contained in Thuja occidentalis, however a cer palmatum was lowest compared to other species. Cellulose was highly contained in Prunus serrulata. Statistically, we have found that the higher lignin content is, the more it cellulose content. These results will do much to alleviate of utilization of Korean native woody plants.
SiC<SUB>f</SUB>/SiC composites are well-known materials for high temperature structural applications because of their intrinsic properties using fusion power reactors such as shield and divertor coolant channel. However, the brittle characteristics of SiC such as low fracture toughness and low strain-to fracture still impose a severe limitation on practical applications of SiC materials. For these reasons, SiC<SUB>f</SUB>/SiC composite can be considered as a promising for structural materials because of their good fracture toughness compared with monolithic SiC ceramics. But, high temperature and pressure lead to the degradation of the fiber. Therefore, an improvement of the coating fiber is key requirements for fabrication of SiC<SUB>f</SUB>/SiC composites by LPS method. In this paper, The SiC<SUB>f</SUB>/SiC composites were fabricated by the LPS method and investigated effects of SiC fiber coating. The SiC<SUB>f</SUB>/SiC composites were fabricated with coated and uncoated Tyranno-SA fibers. The thickness of the coating fiber was 0.25 ㎛ and 0.5 ㎛. In order to investigate effects of coating, the flexural strength were carried out at room temperature, respectively. The densification and microstructure of LPS-SiC<SUB>f</SUB>/SiC composites were observed by FE-SEM.