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RISS 인기검색어
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- 저자 : 방경태 (검색결과 4 건)
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방경태,이상진,고성길,이태억 대한산업공학회 2008 대한산업공학회 추계학술대회논문집 Vol.2008 No.11
전쟁양상의 변화와 첨단전투장비의 등장, 훈련비용 증가 및 제한된 훈련여건 등의 이유로 이에 상응하는 효율적인 훈련체계 구축을 위한 많은 노력이 이루어지고 있다. 본 논문에서는 이를 위해 LVC요소를 유기적으로 결합하여 상호 운용성과 재사용성을 보장하는 LVC통합 체계 구축방안을 제안한다. 상호 운용성 증진을 위해 메타 모델 기반의 공통 모델링 체계와, 이를 효과적으로 지원할 수 있는 공통 자원 체계의 개념을 제안한다. 이를 바탕으로 훈련 및 분석 뿐만 아니라 무기 획득, 개발 분야에도 활용 가능한 구성 모의 중심의 LVC 통합 체계를 제안한다.
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종방향 등줄기가 장수거북 모델의 공력성능에 미치는 영향
방경태(Kyeongtae Bang),김주하(Jooha Kim),김희수(Heesu Kim),이상임(Sang-im Lee),최해천(Haecheon Choi) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Leatherback sea turtles (Dermochelys coriacea) are known as the fastest swimmer and the deepest diver in the open ocean among marine turtles. Unlike other marine turtles, leatherback sea turtles have five longitudinal ridges on their carapace. To investigate the effect of these longitudinal ridges on the aerodynamic performance of a leatherback turtle model, the experiment is conducted in a wind tunnel at Re = 1.0 × 10? - 1.4 × 10? (including that of real leatherback turtle in cruising condition) based on the model length. We measure the drag and lift forces on the leatherback turtle model with and without longitudinal ridges. The presence of longitudinal ridges increases both the lift and drag forces on the model, but increases the lift-to-drag ratio by 15 - 32 %. We also measure the velocity field around the model with and without the ridges using particle image velocimetry. Formation of vortex is observed due to the pressure difference between upper and lower surfaces of model. Strength of vortex is increased with the installation of ridge, resulting the increases in the drag and lift.
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종방향 등줄기가 장수거북 모델의 유체역학적 성능에 미치는 영향
방경태(Kyeongtae Bang),김주하(Jooha Kim),이상임(Samg-im Lee),최해천(Haecheon Choi) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Leatherback sea turtles (Dermochelys coriacea) known as the fastest swimmer and the deepest diver among marine turtles have five longitudinal ridges on their carapace, and these ridges are the most remarkable morphological features distinguished from other marine turtles. To investigate the effect of these ridges on the hydrodynamic performance of the leatherback turtle, we model a carapace with and without ridges using a stuffed leatherback turtle in the National Science Museum, Korea. We measure the drag and lift forces on the ridged model in the ranges of real leatherback turtles’ Reynolds number (Re) and angle of attack (α), and compare them with those of non-ridged model. At α ≤ 6°, longitudinal ridges decrease drag on the ridged model by up to 32 %. On the other hand, at α > 6°, the drag and lift coefficients of the ridged model are higher than those of the non-ridged model, and the lift-to-drag ratio of the ridged model is higher by about 7 % than that of the non-ridged model. We also measure the velocity field around both models using a particle image velocimetry and explain the hydrodynamic role of ridges in relation to diving behaviors of leatherback sea turtles.
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종방향 등줄기가 장수거북 모델의 수력학적 성능에 미치는 영향
방경태(Kyeongtae Bang),김주하(Jooha Kim),이상임(Samg-im Lee),최해천(Haecheon Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Leatherback sea turtles (Dermochelys coriacea) are known as the fastest swimmer and the deepest diver in the open ocean among marine turtles. Unlike other marine turtles, leatherback sea turtles have five longitudinal ridges on their carapace. To investigate the effect of these ridges on the hydrodynamic performance of the leatherback turtle, we model a carapace with and without ridges by scanning a stuffed leatherback turtle in the National Science Museum, Daejeon. We measure the drag and lift forces on the ridged model for the Reynolds-number ranges of real leatherback turtle at different angles of attack (α), and compare them with those of non-ridged model. At α ≤ 6˚, the longitudinal ridges decrease the drag on the model by up to 32 %. On the other hand, at α > 6˚, both the drag and lift coefficients of the model with ridges are larger than those of the model without ridges, but the lift-to-drag ratio of the ridged model is larger by about 7 % than that of the non-ridged model. We also measure the velocity field around the model using a particle image velocimetry and explain the hydrodynamic effect of ridges from an ecological point of view.
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