운동역학 : 태권도 차기기술 분석을 위한 인체 분절의 3차원 위치 결정 = Determination of Three - Dimensional Orientation of Human Body Segments for Analysis of Taekwondo Kicking Techniques

다국어 초록 (Multilingual Abstract)

To propose a reasonable methodology to mathematically quantify Taekwondo kicking techniques should be considered first of all not only for their scientific study but also for their scientific coach in educational or sports field. Therefore, the purpose of this study was to propose a methodology to determine three-dimensional orientation of human body segments by using the concept of relative orientation of Euler’s angle to which can be universally applied the film analysis of Taekwondo kicking techniques, and to represent the three-dimensional relative orientation of joints and segments during Dwi-chagi with the proposed methodology.
Dwi-chagi performed by six male elite Taekwondo players were filmed using two LocamII 16 mm high speed camera set to the filming speed of 100 frames/s. Based on three-dimensional coordinates of anatomical landmarks calculated by DLT method, the relative orientation between two adjacent body segments was determined through three calculation processes, which were consisted of embedding local segment coordinate system on each body segment and making unit vectors, deriving a rotational transformation matrix through the unit vectors, and calculating Euler’s angle through rotational matrix derived by rotations about three axes.
When observing the output of joint and segment motions during Dwi-chagi, the proposed Euler’s angle showed the motion characteristics of Dwi-chagi in detail and naturally. In particular, the quantitative representation of supporting leg and trunk made it possible to define Taekwondo kicking techniques more comprehensively.