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다중 렌더 타겟을 사용하여 정적 및 동적 오브젝트를 분리한 게임용 그림자 매핑 기법
이동렬(Lee, Dongryul),김영식(Kim, Youngsik) 한국게임학회 2015 한국게임학회 논문지 Vol.15 No.5
3D 게임에서 오브젝트의 위치를 파악하거나 사실감을 높이기 위하여 광원의 시점에서 정점의 깊이 값을 계산하는 그림자 매핑 기법이 많이 사용된다. 그림자 맵의 깊이 값은 월드 좌표를 통해 계산되기 때문에 월드 좌표가 변하지 않는 정적 오브젝트는 깊이 값을 갱신할 필요가 없다. 본 논문에서는, (1) 렌더링 속도를 향상시키기 위하여 한번만 저장하는 정적 오브젝트 깊이 값과 매번 갱신하는 동적 오브젝트의 깊이 값을 다중 렌더 타겟을 이용하여 따로 관리한다. 또한 (2) 쿼터 뷰 기반 3D 게임에서 동적 오브젝트 그림자 품질을 높이기 위하여 광원의 위치가 카메라를 따라다니며 동적 오브젝트에 가깝게 변동한다. 제안하는 방법의 효율성을 3D 게임의 다양한 정적 및 동적 오브젝트 구성에 따른 실험을 통하여 검증하였다. To identify the location of the object and improve the realism in 3D game, shadow mapping is widely used to compute the depth values of vertices in view of the light position. Since the depth value of the shadow map is calculated by the world coordinate, the depth values of the static object don't need to be updated. In this paper, (1) in order to improve the rendering speed, using multiple render targets the depth values of static objects stored only once are separated from those of dynamic objects stored each time. And (2) in order to improve the shadow quality in the quarter view 3D game, the position of the light is located close to dynamic objects traveled along the camera each time. The effectiveness of the proposed method is verified by the experiments according to the different static and dynamics object configuration in 3D game.
이일영(Ilyoung Lee),최태규(Taegue Choi),한효진(Hyojin Han),박정향(Junghyang Park),이동렬(Dongryul Lee) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Headlamp is the essential product in the vehicles. Nowadays, the consumers are asking increasingly demanding requirements in their needs. This paper is to present assembly tolerance reference for headlamp photometric performance that installs the led projection module through photometric analysis. The projection module was installed the one unit that assembled the four unit parts. The four parts are light-source, reflector, light-shield and projection lens. The tolerance in the assembly module is an inevitable trouble. It makes a quality problem of lamp product. And so, the projection module needs an establishment of the tolerance reference. This paper studied how to keep the tolerance of the each unit part to satisfy the photometric regulations.
이승욱(SeungWook Lee),송룡수(RyongSu Song),이동렬(DongRyul Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
In this study, the objective of this research is to conduct the flow analysis of Torque Converter with Speed Ratios. Torque Converter consists of Turbine, Impeller, Stator. The Torque Ratio, The Efficiency, The Capacity Factor according to the Torque Converter with Speed Ratios through ANSYS CFX. The Torque Ratio of 1.82 was the highest Torque Ratio at Speed Ratio of 0.3. The Torque Ratio of 1.01 was the lowest Torque Ratio at Speed Ratio of 0.8. The Efficiency of 81.42% was the highest Efficiency at Speed Ratio of 0.7. The Efficiency of 54.49% was the lowest Efficiency at Speed Ratio of 0.3. The Capacity Factor of 2.05 was the highest Capacity Factor at Speed Ratio of 0.5. The Capacity Factor of 1.48 was the lowest Capacity Factor at Speed Ratio of 0.8. In conclusion, the optimized design for Torque Converter should be at Speed Ratio between 0.7 and 0.8.
송룡수(RyoungSu Song),이동렬(DongRyul Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
in this study, we analysed the influence of the flow and performance of the generated micro gas turbine with different rotational speeds. CFD analysis was also performed using commercial code called ANSYS CFX 14.5. It adopted the turbine of radial flow type suitable for power generation for small rotating equipment. The number of blades was designed with each radial turbine 8, vane nozzle 14. The boundary layer flow analysis was widely used to the SST model. Mass flow rate of the turbine was 1.45 kg/s. While the rpm varies from 38,000rpm to 48,000rpm under various boundary conditions, the distributions of Mach number and pressure were numerically analyzed for electric power output, turbine isentropic efficiency. We analyze the inlet pressure, outlet temperature, electric power output, turbine isentropic efficiency. It compared maximum and minimum revolution through CFD analysis. Power output of maximum revolution has been increased 18% more than minimum revolution. Isentropic efficiency of maximum revolution has been increased 16.5% more than minimum revolution. Therefore maximum power output was 332kW, and maximum isentropic efficiency was 33.2%.
강제대류에 따른 Lithium Polymer 배터리 열·유동해석
박찬우(Chanwoo Park),이동렬(Dongryul Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
This research is to investigate the convection cooling performance in the Lithium Polymer Battery without heat sink. Research focus is on the study on cooling performance that forced convection cooling is better than natural convection cooling. Therefore, selected local locations for various temperature distributions had shown. Final temperature on the cell surface has compared by forced convection with natural convection. According to the results of velocity in the fluid domain, Buoyancy appear by density difference in the natural convection. Unlike natural convection, vortex was detected in the fluid domain for forced convection. According to the calculations of convective heat transfer between cell and atmosphere in the battery pack, average temperature value of the cell surface has been increased 11.205% by natural convection. While average temperature value of the cell surface has been decreased 46.50% by forced convection. Due to the vortex by air, cooling performance of forced convection is very excellent. In addition, cooling on edge of the battery is better than heat source location.
김건형(Gunhyung Kim),정희도(Heedo Jung),박찬우(Chanwoo Park),이동렬(Dongryul Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Recently, as demand for secondary battery has been increasing, the interest in thermal control which determine the capacity of secondary battery is growing in parallel. Following these trends, the research on thermal management system has gone along actively. In this study, after simplifying the secondary battery with attached heat-sink, the research was conducted for cooling effect on natural convection and forced convection. Also it analyzed the velocity field and temperature field via making second battery lay-out into tetragonal inlet and outlet respectively. Based on them, it is found that in case of natural convection, the temperature increases 22% than the first level and another case of forced convection, the temperature cools down by 39% than at first time. Several results with cooling effect of secondary battery could be obtained from the study.