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RISS 인기검색어
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- 저자 : 권영후 ( Young Hoo Kwon ) (검색결과 21 건)
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성낙준 ( Rak Joon Sung ),권영후 ( Young Hoo Kwon ) 한국운동역학회 1994 한국운동역학회지 Vol.4 No.2
A comprehensive simulation software package was developed in C base on the work done by Yeadon et al.(1990) and Kwon (1993a) in the aim of making it easy to apply the experimental simulation technigues to the human airborne movement studies. This package consists of 3 programs: simulation variable computation program (PREP), simulation program (SIM) and the 3-dimensional graphic program (3DMAN). All programs are driven by an easy-to-use menu system and written compatible to KWON3D Motion Analysis Package Version 2.1 (Kwon, 1993b). Program PREP consists of 4 menus: `Edit Data´, `Prepare´ `Angular Momentum´ and `Optimization´. The `Edit Data´ environment is an editor for the lengths of the segments and body lines. The `Prepare´ menu computes the internal orientation angles of the segments while the `Angular Momentum´ menu computes the mean airborne angular momentum of the body and other initial conditions such as the initial position and velocity of the body CM and the initial external orientation of the body. The `Optimization´ menu performs angular momentum optimization proposed by Kwon (1993a). A geometric 15-segment body model - Yeadon-Kwon model (Kwon, 1993b) - with at most 38 degrees of freedom including 3 external orientation angles (somersault, inclination and twist angles) was employed to compute the simulation variables. SIM consists of 2 menus: `Edit Angles´ and `Simulate´. The `Edit Angles´ environment is an editor for the internal orientation angles of the segments. Users can intentionally manipulate the internal orientation angles for the simulation of modified trials. The program displays time-angle curves segment by segment. The `Simulate´ menu actually performs simulation. The initial conditions can be directly manipulated in the program menu environment. The simulation program was tested by several theoretical configurations to screen out the flaws in the theory and to isolate coding mistakes. The simulated results were compared with the predicted results and the program showed good agreements between the simulated results and the theoretical predictions. The simulation program was then applied to several gymnastic maneuvers and springboard dives for testing. 3DMAN was developed in the extension of the traditional `Stick Figure´ graphics. The program is segment-oriented and the 3-D shape of each segment is defined defined independently in a graphic model file to allow the users to use different body models with different, combinations of segments. The model file was designed easy to edit so as to allow the users to change the graphic model easily to meet their specific needs. The graphic model file can be edited using any text editor such as `EDIT´ of DOS. Once the `3-D Graphics´ option is activated followed by the registration of the graphic model files, the program draws the 3-D shapes of the segments whose model files are registered. All the graphics-related menus including registration of the segment graphic model files are accessible within the graphic environment.
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친수성/소수성 복합표면상에서 초기 구형 액적의 이송 메커니즘
명현국(Hyon Kook Myong),권영후(Young Hoo Kwon) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.11
유체이송 기술은 마이크로 유체시스템 개발에서 핵심문제로 인식되고 있다. 최근 명(2014)은 외부동력을 사용하지 않고 액적을 이동시킬 수 있는 새로운 개념을 제안하고, 초기에 반원통형 형상을 가지는 가상의 2차원 액적에 대한 수치해석을 통해 이 개념이 성립함을 보였다. 또한 명과 권(2015)은 친수성/소수성 표면위에서 초기 3차원 반구 형상의 실제 물 액적이송의 메커니즘을 시간에 따른 액적형상과 액적 내부의 운동에너지, 중력에너지, 표면자유에너지 및 압력에너지의 수치해석 결과를 통해 규명하였다. 본 연구는 새로운 개념을 확립시키기 위해 초기 구형액적에 대한 3차원 수치해석을 수행하고, 액적이송의 메커니즘을 모세관력 힘의 불균형 관점에서 액적 형상과 다양한 에너지의 수치해석 결과를 통해 규명하였다. Fluid transport is a key issue in the development of microfluidic systems. Recently, Myong (2014) has proposed a new concept for droplet transport without external power sources, and numerically validated the results for a hypothetical 2D shape, initially having a hemicylindrical droplet shape. Myong and Kwon (2015) have also examined the transport mechanism for an actual water droplet, initially having a 3D hemispherical shape, on a horizontal hydrophilic/ hydrophobic surface, based on the numerical results of the time evolution of the droplet shape, as well as the total kinetic, gravitational, pressure and surface free energies inside the droplet. In this study, a 3D numerical analysis of an initially spherical droplet is carried out to establish a new concept for droplet transport. Further, the transport mechanism of an actual water droplet is examined in detail from the viewpoint of the capillarity force imbalance through the numerical results of droplet shape and various energies inside the droplet.
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