• 대한수학교육학회지:수학교육학연구
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• 제19권3호
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• pp.425-441
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• 2009

공간감각력은 도형영역의 학습과 관련하여 제7차 교육과정 이후 강조되어온 수학적 능력이다. 공간감각력의 신장을 위해 수학 6-가 단계의 교과서에는 쌓기나무단원과 관련하여 쌓인 입체의 위, 앞, 옆에서 본 모양이 주어질 때 쌓인 모양을 알아보는 활동이 포함되어 있다. 본 연구의 목표는 쌓기나무 단원의 전술한 활동을 지도하기 위해 교과서에서 제시한 층별 구성적 접근과 달리 새로운 접근법으로서 부분제거법을 제안하고, 그 방법을 6학년 학생들에게 적용해봄으로써 그 지도 가능성 및 효과를 알아보는 것이다.

• Wind and Structures
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• 제37권1호
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• pp.25-38
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• 2023

Due to the complexity and difficulty in meeting the multiphase flow complexity, similarity, and multiscale characteristics, the mechanism of snow drift is so complicated that the snow deposition prediction is still inaccurate and needs to be far improved. Meanwhile, the validation of prediction methods is also limited due to a lack of field-measured data about snow deposition. To this end, a field measurement activity about snow deposition around a cube with time was carried out, and the snow accumulation process was measured under blowing snow conditions in northwest China. The maximum snow depth, snow profile, and variation in snow depth around the cube were discussed and analyzed. The measured results indicated three stages of snow accumulation around the cube. First, snow is deposited in windward, lateral and leeward regions, and then the snow depth in windward and lateral regions increases. Secondly, when the snow in the windward region reaches its maximum, the downwash flow erodes the snow against the front wall. Meanwhile, snow range and depth in lateral regions have a significant increase. Thirdly, a narrow road in the leeward region is formed with the increase in snow range and depth, which results in higher wind speed and reforming snow deposition there. The field measurement study in this paper not only furthers understanding of the snow accumulation process instead of final deposition under complex conditions but also provides an important benchmark for validating prediction methods.