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최상일(Sang-Il Choi) 한국컴퓨터정보학회 2015 韓國컴퓨터情報學會論文誌 Vol.20 No.11
We propose a hybrid pattern recognition method that effectively combines two different features for improving data classification. We first extract the PCA (Principal Component Analysis) and LDA (Linear Discriminant Analysis) features, both of which are widely used in pattern recognition, to construct a set of basic features, and then evaluate the separability of each basic feature. According to the results of evaluation, we select only the basic features that contain a large amount of discriminative information for construction of the combined features. The experimental results for the various data sets in the UCI machine learning repository show that using the proposed combined features give better recognition rates than when solely using the PCA or LDA features.
최상일 ( Sang Il Choi ),강정규 ( Jeong Gyu Kang ) 한국감정평가학회 2011 감정평가학논집 Vol.10 No.1
This study is to establish a house selection expectation model in senescence. An object of study is baby boom generation which lives in Busan. Research finding shows that baby boom generation``s demand structure will be changed from midium-large to midium-small. Thus it is important to research their senescence house consumption needs in case of house marketing part. Then suggest few prediction of a house size selection expectation model. First, This group has retirement savings less than \200,000,000 and invest vital index to house less then 4.25, comfort vital index to house less than 2.82. It is more than 50% that they will choose a house smaller than 85㎡. Second, This group has retirement savings less than \200,000,000 and invest vital index to house more then 4.25. And attending a patient cognition is out of family. 33% of them will be select 103~119㎡ house. The trait of this research, variable and analysis method couldn``t be used all. Therefore it seems to have limitation. For that reason, if there are various researches of house selection expectation model, it will be very useful method for a company of house marketing part.
최상일(Choi Sang-Il),장현태(Jang Hyun Tae) 한국산학기술학회 2005 한국산학기술학회 학술대회 Vol.- No.-
공기중의 산소농축 PSA 기술로 RPSA(Rapid Pressure swing adsorption)이 적용되므로 1979년 이후 소형의 의료용 장치로 상업화되기 시작하였다. 산소발생기(산소농축기)의 경우에도 개량형 RPSA방식을 적용한 기술로써 최근 우리나라도 고령화 사회가 되므로써 의료용으로 사용이 확대되고 있으며, 기타 작업장이나 특수 시설 등에서 사용이 증대되고 있다. 이러한 산소농축기의 핵심부품 중의 하나인 흡착탑의 경우 흡착제 구성 및 흡착탑의 구조에 의하여 성능이 좌우되고 있다. 현재 상용화된 제올라이트의 각 흡착제의 흡착특성을 도출하기 위하여 압력, 온도, 수분함유량에 따른 파과곡선을 측정하여 흡착탑의 단수에 따른 최적 단수를 도출하였다.