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It is very important to determine the consolidation rate of ground, depending on the progress of time in applying vertical drain method, so that various consolidation analysis solutions are proposed for forecasting of the consolidation rate. The consolidation rate measured in the actual field, however, has a considerable difference from the value which was obtained by the interpretation of vertical drain consolidation. This study was assessed the applicability and validity of each consolidation analysis solution by comparing and analyzing the degree of consolidation actually measured in the field and the degree of consolidation based on the theoretical equation for the analysis of the consolidation of Hansbo, Onoue, Zeng&Xie used as the consolidation analysis solution before the start of construction. on the basis of the site measurement data and ground survey data as to the deep soft ground in Busan area which applies PBD method.
This study results of performed field load test in order to estimate the best pile length assessment and allowable bearing capacity of the pile foundation. End of initial driving(EOID) and restrike of pile dynamic loading tests were performed to calculate allowable bearing capacity of the experimental pile side and results were compared with the allowable bearing capacity estimated by theory. The results of allowable bearing capacity by EOID test is 1.08~1.21 in the range of compared to the capacity calculated by the Structure Foundation Design Criterion. Allowable bearing Capacity by restrike of pile dynamic loading test is 1.32~1.48 in the range of compared to the Structure Foundation Design Criterion. The Foundation Design Criterion underestimated the pile capacity. If the bearing capacity calculated by Structure Foundation Design Criterion is 100, EOID of pile dynamic loading test is 116, restrike of pile dynamic loading test is 138 for 20m pile used in this experimental.
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.
집락표본 추출을 할 때에, 이 논문에서는 주어진 비용 아래서 모총계 추정량의 분산을 최소로 하는 집락의 크기와 표본 추출율을 단위당 조사비용이 변하는데 따라서 구하는 문제를 다루었다. 집락의 크기는 행정상의 편리성과 분산과의 연계성을 고려하여 결정하였다. In this paper, we determine cluster size and sampling fraction on the given costs. The cluster size depends on unit cost in survey. The size of a cluster is determined with consideration of administrative convenience as well as the variance in accordance with unit cost.
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.
우리나라에는 1995년 11월1일 기준으로 232개의 기초자치단체가 있는데, 각 기초자치단체들은 위치와 인구수에 따라 대도시형, 중소도시형, 농어촌형 등으로 구분할 수 있다. 이와 같은 기초자치단체들은 주택 및 인구관련 통계에 있어서도 집단별로 서로 다른 특성을 가지고 있을 것으로 판단된다. 본 논문에서는 우리나라 232개 기초자치단체들을 위치와 인구수에 따라 2집단으로 집단화를 실시한 후에 주택 및 인구관련 자료를 이용한 판별분석을 실시하여 이와같은 집단화가 어느정도 설명될 수 있는가를 연구한다. 또한 판별분석결과 오분류된 사례들에 대한 재분류과정을 통하여 완전분류를 실시한 후에 신경망분석방법인 다중퍼셉트론 방법을 이용한 분류를 실시하여 다중퍼셉트론 방법의 유용성을 알아보고 판별분석 결과와 비교분석 한다. There are 232 basic self-governing communities in KOREA. Each communities can be classified as large city type, medium/small city type, and rural area type based on the location and number of population. These communities may have different characters on the type. In this paper, we have classified the 232 communities into two groups and tried discriminant analysis by using the housing and demographic variables to find whether the groups can be explained by the variables. We have also tried the multilayer perceptron method to find the classification. By comparing the classification results of multilayer perceptron and discriminant analysis, we have tried to understand the system of multilayer perceptron that is a major classification method of neural network.
In Rc structre, sufficient anchorage of reinforcement is necessary for the member to produce the full strength. In the case of beam-column joints, the problems of overcrowded rebar arrangement and lowered compaction of concrete can occur often due to the development of rebar, so it is required to study those problems. This research aims at verifying the performance requirements of the equipment for rebar development at the beam-column joints by using a head rebar method, one of the mechanical construction methods, and identifying functions of head rebar through a pull-out test. Headed steel in the shape of main rebar at the girder-column joint and test value in the shape of hook show similarity.
It is very important to determine the consolidation rate of ground, depending on the progress of time in applying vertical drain method, so that various consolidation analysis solutions are proposed for forecasting of the consolidation rate. The consolidation rate measured in the actual field, however, has a considerable difference from the value which was obtained by the interpretation of vertical drain consolidation. This study was assessed the applicability and validity of each consolidation analysis solution by comparing and analyzing the degree of consolidation actually measured in the field and the degree of consolidation based on the theoretical equation for the analysis of the consolidation of Hansbo, Onoue, Zeng&Xie used as the consolidation analysis solution before the start of construction, on the basis of the site measurement data and ground survey data as to the deep soft ground in Busan area which applies PBD method.
최기철(Ki-Chul Choi), 임용재(Yongjae Lim), 이재범(Jae-Bum Lee), 남기표(Kipyo Nam), 이한솔(Hansol Lee), 이용희(Yonghee Lee), 명지수(Jisu Myoung), 김태희(Taehee Kim), 장임석(Limseok Jang), 김정수(Jeong Soo Kim), 우정헌(Jung-Hun Woo), 김순태(Soontae ) 한국대기환경학회 2018 한국대기환경학회지 Vol.34 No.2
Emission inventory is the essential component for improving the performance of air quality forecasting system. This study evaluated the simulated daily mean PM2.5 concentrations in South Korea and China for 1-year period (Sept. 2016~Aug. 2017) using air quality forecasting system which was applied by the emission inventory of E2015 (predicted CAPSS 2015 for South Korea and KORUS 2015 v1 for the other regions). To identify the impacts of emissions on the simulated PM2.5, the emission inventory replaced by E2010 (CAPSS 2010 and MIX 2010) were also applied under the same forecasting conditions. These results showed that simulated daily mean PM2.5 concentrations had generally suitable performance with both emission data-sets for China (IOA>0.87, R>0.87) and South Korea (IOA>0.84, R>0.76). The impacts of the changes in emission inventories on simulated daily mean PM2.5 concentrations were quantitatively estimated. In China, normalized mean bias (NMB) showed 5.5% and 26.8% under E2010 and E2015, respectively. The tendency of overestimated concentrations was larger in North Central and Southeast China than other regions under both E2010 and E2015. Seasonal differences of NMB were higher in non-winter season (28.3% (E2010)~39.3% (E2015)) than winter season (-0.5% (E2010)~8.0% (E2015)). In South Korea, NMB showed - 5.4% and 2.8% for all days, but - 15.2% and - 11.2% for days below 40 μg/m3 to minimize the impacts of long-range transport under E2010 and E2015, respectively. For all days, simulated PM2.5 concentrations were overestimated in Seoul, Incheon, Southern part of Gyeonggi and Daejeon, and underestimated in other regions such as Jeonbuk, Ulsan, Busan and Gyeongnam, regardless of what emission inventories were applied. Our results suggest that the updated emission inventory, which reflects current status of emission amounts and spatio-temporal allocations, is needed for improving the performance of air quality forecasting.