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마우스 장치를 이용한 3차원 카메라와 물체의 회전 제어 도구
조송래(Songrae Cho),이상윤(Sangyoon Lee),박찬모(Chan-Mo Park),김정현(Jounghyun Kim) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.1B
3차원 상의 카메라 또는 물체를 제어하는 연구는 많이 되어져 왔다. 특히 카메라 또는 물체의 회전을 제어하는 분야에서는 대부분의 연구가 기존의 트랙볼(Trackball)이나 아크볼(ARCBALL)을 기반으로 하고 있다. 하지만 아크볼은 볼의 실루엣 부분에서 회전이 제어 될 때 회전속도가 급격해 지는 등의 단점으 가지고 있고 트랙볼은 회전 조합의 성질을 갖지 못하는 단점을 가지고 있다. 본 논문에서는 트랙볼과 아크볼의 장점을 살리고 단점을 보완한 개선된 3차원 카메라와 물체의 회전 제어 도구를 제안한다.
Applicability of Soil Suitability Class Assessed with the Quantification Theory I
Woori Go,Byunghwan Seo,Songrae Cho,Yeonkyu Sonn 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.2
This study was conducted to suggest a method to assess soil suitability for crops objectively with categorical soil data and multivariate analysis methods. The Quantification Theory I was selected for the multivariate analysis method and the comprehensive point method was used as the conventional analysis tool for soil suitability assessment. The sites to survey soil characteristics and fig production were determined to include all classes of soil samples for all soil factors. Soil factors were soil texture of the subsoil, drainage class, available soil depth, gravel contents, and soil slope. In order to apply it nationwide based on the materials of the survey area, we used the 1,361 soil symbols data in Korea. After calculating the quantity forecast value for each soil factors, it was divided into four equal parts in descending order of very suitable, suitable, possible, and not suitable area. In the comprehensive point method, points were applied for each soil factor, and then classified according to the sum of the scores. The result of comparing the soil suitability class of the two setting methods the 1,361 soil symbols, 876 (64.4%) had the same grade, and 485 (35.6%) were classified as one grade lower or higher. Quantification Theory I is considered to have the potential to be utilized because it has the advantage of being able to classify at once through statistical analysis without subjective intervention if there is crop quantity data.