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포인트 클라우드의 강건한 특징 검출을 위한 군집화 기반의 법선 추정 기술
한지훈(Jihoon Han),신민우(Minwoo Shin),박상우(Sangwoo Park),강동구(Donggoo Kang),노영록(Youngrock Lo),백준기(Joonki Paik) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
This paper presents a clustering-based normal estimation method for robust feature point detection in point clouds. Existing feature point detection methods have insufficient expression using the location and color features of the point cloud. However, the proposed method calculates the normal feature for each point by using the cluster"s normal estimation. The proposed method utilizes a better recall than the existing method in the point cloud matching problem and can be used for various point cloud matching problems.
한지훈 ( Jihoon Han ),정은영 ( Eunyoung Jeong ) 한국생물교육학회 2021 생물교육 Vol.49 No.1
The purpose of this study was to investigate the implementation of ‘Science Inquiry Experiment’ classes. In order to do this, the researcher’s classes were monitored by applying self-study and the students’ perception on the classes were examined. The participants were 4 persons including the researcher and critical colleagues. ‘Science Inquiry Experiment’ classes were implemented to 109 students of 4 classes during 1 semester. The data were self-reflection diaries, records of discussion with critical colleagues, and questionnaire surveys and interviews with students. In these classes, the groups of four or five students would carry out investigation activities, experiment, discussion and debate. The researcher was excessively involved in the students’ activities, and didn’t give the adequate feedback on students’ questions. But the classes changed from teacher-centered to learner-centered one by self-reflection and discussion with critical colleagues. The students became more interested in the classes and came to actively participate in them. By applying the process-centered assessments, many students reached their achievement goals because of the appropriate feedback, and they satisfied with the classes. However, the teachers’ perception on the process-centered assessment was still lacking, and there were difficulties in preparing assessment criteria. In addition, the frequent feedback in the process of assessment was an excessive work burden on the teachers. There were difficulties such as the lack of science labs and experimental equipment and materials, and the free-riding of students, which often occurs in group activities, was also a problem. For the effective implementation of ‘Science Inquiry Experiment’ classes, not only physical environments but also process-centered assessment, guidance materials for self-study, and teacher training are necessary.