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최대식(D. S. Choi),김석우(S. W. Kim),김재덕(J. D. Kim),유한성(H. S. Yoo),이승배(S. B. Lee) 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.12
This study is an example of each improvement activity of driver noise and sound power for a 4 ton class forklift.. To reduce the noise power of the forklift, it is necessary to reduce the noise of the cooling fan. Noise analysis was carried out by applying the optimal design of the cooling fan to simulate nature and applying the eagle wing airfoil. An analysis of noise reduction was conducted through the experimental results mounted on an actual forklift. In order to reduce driver noise, a sound absorbing and insulating material was attached inside the cabin to reduce engine radiation noise. Acoustic BEM analysis and acoustic camera equipment were used to understand the effects on sound absorbing and insulating materials.
최대식(Choi Dae Sik),성장환(Seong Jang Hwan) 한국도시행정학회 2010 도시 행정 학보 Vol.23 No.1
This study aims to forecast the future demand for residential land in each municipality and the whole country. To this end, this study develops two separate models: a per capita living space estimation model and a population projection model. For the former, the whole country is classified into seven municipality groups and a model is established for each group. According to the results, county residents in the non-capital region are expected to have the largest per capita living space of 32.93m' in 2020, while city residents in the capital region to have the smallest of 25. 39m'. The future population of each municipality is projected with the use of Cohort survival method and regression method. In terms of the population increase rate, Yongin ranks the highest, followed by Gwangju(Gyeonggi), Paju, Hwaseong and Ansan. All of them are located in the capital region. Based on these results, the future demand for additional housing space and residential land is derived. By 2020, an additional housing space of 50lkIn', or 5.9 million housing units, are expected to be needed, with the demand for new residential development area reaching 767km', By city, Bucheon is found to have the highest ratio of the demand for new residential area in comparison with 'urban area' designated by the National Land Planning Law, followed by Anyang, Suweon, Seoul and Seongnam. By municipality group, Seoul/Incheon ranks the highest with the annual rate of 0.79 percent, followed by cities in the capital region, and metropolises in the non-capital region. Counties in the non-capital region are forecasted to have the annual rate of 0.06 percent, far lower than other groups.
Random forest 를 이용한 RNA 에서의 단백질 결합 영역 예측
최대식 ( Daesik Choi ),박병규 ( Byungkyu Park ),채한주 ( Hanju Chae ),이욱 ( Wook Lee ),항경숙 ( Kyungsook Han ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2
단백질과 RNA 의 상호작용 데이터가 대량으로 늘어남에 따라, 단백질과 RNA 의 결합부위를 예측하는 계산학적인 방법들이 많이 개발되고 있다. 하지만, 많은 계산학적인 방법들은 단백질에서 단백질과 RNA 결합부위를 예측한다는 한계점이 있었다. 본 논문에서는 RNA 와 단백질의 서열정보를 모두 사용하여, 단백질과 결합하는 RNA 결합부위를 예측하는 기법과 그 결과를 논한다. WEKA random forest(http://www.cs.waikato.ac.nz/ml/weka/)를 이용하여 예죽 모델을 개발하였고, RNA 서열의 서열 프로파일, 서열 composition, 결합 상대방의 단백질의 특성 등을 특징으로 표현하였다. Random forest 기법을 사용한 cross validation 의 결과로서 1:1 모델에서 제일 높은 성능인 92.4% sensitivity, 92.0% specificity, 92.2% accuracy 를 보였고, independent test 에서는 72.5% sensitivity, 90.0% specificity, 92.1% accuracy 를 보였다.