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남자 고교 태권도시범단원의 뒤공중돌기와 뒤공중 앞차기 1단계, 2단계 동작의 생체역학적 비교
강동권,김혜리 국기원 2019 국기원태권도연구 Vol.10 No.2
The purpose of this study is to provide instructors and demonstration team member with information to improve their understanding of the Back Somersault Kick and their teaching methods. In this experiment, 9 male Taekwondo demonstration team members were selected. 3-D motion analysis cameras (200 Hz) and ground reaction force system (2,000 Hz) were used to collect and analyze biomechanical variables. The biomechanical variables of the Back Somersault, Back Somersault 1 step Kick, and Back Somersault 1 step Kicks were analyzed with the One-way Repeated Measured ANOVA, and post-hoc was used by bonferroni. The results of this study are as follows: First, when the kick is added in Back Somersault, the vertical jump height is lowered, which shortens the time of flight. Second, when the kick is added in Back Somersault, the rotational speed of the horizontal axis is slowed, increasing the risk of landing. Third, Back Somersault 1 step and Back Somersault 2 step are much the same, but there is a difference in landing stability. Therefore, the next movement should not be attempted without sufficient flight time, and training should be required to flex the whole body quickly after kick. 이 연구는 남자 고교생을 지도하는 현장의 지도자들과 시범단원들에게 뒤공중 앞차기 동작에대한 이해를 높이고 지도법을 개선하기 위한 정보를 제공하는데 목적이 있다. 본 연구는 남자고교 태권도시범단원 9명을 대상으로 실험하였고, 생체역학적 변인을 수집하고 분석하기 위하여 3차원 동작분석 카메라(200Hz)와 지면반력기(2000Hz)를 사용하였다. 뒤공중돌기, 뒤공중 앞차기 1단계, 뒤공중 앞차기 2단계의 생체역학적인 변인들은 One-way Repeated Measured ANOVA로 검증하였고, 사후분석은 bonferroni로 검증하였다. 본 연구의 결과는 다음과 같다. 첫째, 뒤공중돌기에서 차기 동작이 추가되면 수직 점프 높이가 낮아져 체공 시간이 짧아진다. 둘째, 뒤공중돌기에서 차기 동작이 추가되면 수평축 회전 속도가 느려져 착지의 위험성이 증가한다. 셋째, 뒤공중 앞차기 1단계와 2단계는 많은 부분 동일하지만 착지의 안정성에서 차이가나타난다. 따라서 체공시간이 충분하지 않은 상태에서 차기 동작을 무리하게 시도해서는 안되며, 보조자 또는 안전매트를 구축한 상태로 지면에서 어깨를 빠르게 굴곡하고 차기 이후 전신을 신속하게 굴곡시키는 훈련이 필요하다.
발사대의 동역학 해석을 위한 통합 CAE Tool 개발
강동권 동의공업대학 1998 論文集 Vol.24 No.1
In this study, the CAE Tool for dynamic analysis of a launcher are developed and introduced. The dynamic behavior of a launcher system under impulse forces is analyzed using a CAE Tool. The developed program consists of three basic elements. The preprocessor creates or edits the input data of the main program to analyze the dynamic behavior of a launcher system. The preprocessor shows the initial configuration of the system to verify values of input data. In the main program. an efficient and systematic formulation for the dynamics of spatial multibody systems is derived and developed from the velocity transformation technique. All the components of the launcher system, i.e., chassis. turret, cage and suspension parts are modeled as rigid. The force interaction between a torsion bar and the ground is modeled, including nonlinear properties. Vehicle modeling and stability analyses of the system under impulsive force are performed. The postprocessor has an animation module and a graph module. The analysis results can be studied by constructing plots with the graph module or by animating the results to visualize the launcher system behavior
강동권 동의공업대학 2000 論文集 Vol.26 No.1
Hydraulic engine mount is usually used to improve the noise the vibration quality. Design variables of the hydraulic engine mount, the mass of orifice fluid and viscous damping coefficient, are coupled of each other. In this study, the governing equation of hydraulic engine mount is derived and hydraulic engine mount module of DADS program is made to predict the performance in time domain. Effects of the design variables on ride quality are investigated by changing the values of hydraulic stiffness, ratio of the cross-sectional area of the upper chamber to that of the orifice, and fluid mass in the orifice. Eighteen cases are compared and an optimum value for a quarter car is proposed.
강동권,조현수 동의공업대학 1999 論文集 Vol.25 No.1
This paper presents a study to develop the design procedure of valve rotators which turn the inlet and exhaust valves of four stroke marine diesel engines a little each time the valves are open. First the functions of all parts of a valve rotator were discussed. And then in order to get the better understanding of the movement mechanism a rotating test apparatus was made and then the measured results from the test apparatus were studied. Those discussion and test showed that the loading position among parts, the quality of coned disk springs, and the surface hardness of some parts are the most important factors in the design of valve rotators.
강동권 동의공업대학 1999 論文集 Vol.25 No.1
This paper proposes a design procedure for the adjustable crankshaft mechanism of bicycle pedal. And 3D solid models of the mechanism and 2D drawings from the solid models is created using 3D CAD. Then Simulation based on analysis of multibody dynamic motion in mechanical system were performed to predict the performance of the adjustable crankshaft mechanism of bicycle pedal compared to conventional crankshaft mechanism. The multibody dynamic models are constructed and compared to verify the effects of the adjustable crankshaft mechanism and conventional crankshaft mechanism.