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중등학생의 특수상대론 학습에서 VR과 사건도표를 이용한 수업방법의 제안
김재권 ( Jaek Won Kim ),김영민 ( Young Min Kim ) 경북대학교 과학교육연구소 2011 科學敎育硏究誌 Vol.35 No.2
The purpose of this study were to develop a tutorial for secondary students to understand of basic concepts of special relativity, which is appropriate for the cognition level of secondary student. We developed the concept evaluation tool and the tutorial material. Result from pretest and post-test are presented to verify the effect of the tutorial for helping student understanding of the concept such as time, event, reference frame, relativity of simultaneity. Secondary student had intense cognitive conflict about the complex concepts such as simultaneity, length contraction and time expansion. This tutorial could be proposed methodology to overcome cognitive difficulty for understanding these concepts.
노태양(Tae-yang Noh),장원택(Won-tek Jang),김재권(Jaek-won Kim),박종연(Jong-yoen Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
One of the primary concerns for welding device design is how to reduce the distance error between welding path and a torch, especially in case that the path is composed of circular and linear combination. This study deals with a mechanism in order to reduce the tracking error at the tangent area of circular and linear path. A portable welding device, called a carriage, has designed for a specific welding path through the comparison of distance error deviation. The welding carriage for a vertical cover plate welding consists of a set of rail, a welding torch and carriage body itself.