• Journal of Korea Multimedia Society
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• v.13 no.5
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• pp.792-801
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• 2010

In this paper, we introduce a novel scene graph library for mobile platforms, called the 'Mobile OpenSceneGraph (Mobile OSG)', as a mobile graphics middleware. Our mobile scene graph library supports several nice properties, including platform-independence, extensibility, touch-based UI supports, and compatibility, by carefully adapting the OpenSceneGraph library, one of the most widely used graphics middlewares for desktop platforms, to mobile platforms. We validate the usefulness of the proposed library for mobiles with the several experimental results including real-time rendering, camera manipulations with a touch-based UI, and animations with switching geometric nodes.

• IEMEK Journal of Embedded Systems and Applications
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• v.9 no.1
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• pp.11-16
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• 2014

When it comes to develop flight simulator, HAT (Height Above Terrain) is required to provide altitude information to the pilot who learns how to control an airplane in landing and takeoff situation. However, there might be inconsistent problem between real terrain and simulation information since current implementation of HAT simply depends on center of gravity point on the airplane. To overcome mentioned problem, in this paper, we propose how to obtain more accurate altitude information than existing scheme by making use of HAT and HOT (Height Of Terrain) information of landing equipments according to movement of the airplane. Moreover, we demonstrate the accuracy of the proposed scheme through new flight simulator developed through OSG(OpenSceneGraph) by taking example of terrain information for domestic airport.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.27-28
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• 2016

실시간 렌더링 시스템에서 시야를 변경하는 속도가 증가할수록 FPS(Frame Per Second)가 감소하는 문제가 발생한다. 이에 따라 시야 변경이 증가할수록 감소하는 FPS를 향상하기 위한 렌더링 최적화 기술이 요구되며, 본 논문에서는 동적 LOD(Level of Detail)와 컬링 기술을 적용하여 실시간 렌더링 과정에서 렌더링 데이터를 감소함으로써 저하되는 FPS를 증가시키기 위한 렌더링 최적화 기법과 HMD(Helmet Mounted Display)의 움직임에 따라 변경된 시야각을 적용한 OSG(Open Scene Graph) 기반 실시간 렌더링 시스템을 제시한다.

• Journal of Navigation and Port Research
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• v.35 no.6
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• pp.489-494
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• 2011

Present study introduces an implementation of product data management (PDM) that can be applied to the design of ship propulsion system. The PDM system is developed based on both object oriented software development environment and Open Scene Graph (OSG) library while the system architecture is modeled by the unified modeling language (UML). Suggested PDM system also integrates the modeling & simulation components required to estimate the performance of ship propulsion system as the product information is represented based on the 3-dimensional digital mock-up (DMU). Finally, functions of the implemented PDM system that is integrated with the M&S softwares are illustrated in order to suggest a practical guidance for the efficient design of ship propulsion system.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.457-459
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• 2012

가상현실 환경은 사용자가 데이터와 상호작용하면서 직관적으로 데이터를 인지할 수 있게 해주는 인터페이스를 제공한다. 이런 가상현실 환경은 고해상도 디스플레이 장치에서 사실상 유일하게 사용할 수 있는 사용자 친화적인 인터페이스 방식이기도 하다. 본 논문에서는 고해상도 디스플레이 장치를 이용한 몰입형 가상현실 환경에서 사용되는 사용자 인터페이스 프레임워크를 소개하기로 한다. 이 인터페이스 프레임워크는 VR Juggler와 OSG(OpenSceneGraph)를 기반으로 하며, 다양한 형태의 디스플레이 장치를 이용한 몰입형 가상현실 환경에서 사용자가 가상현실과 상호작용하는데 필요한 기반 환경을 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.455-458
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• 2011

컴퓨터에서 생성된 시뮬레이션 결과는 가시화(Visualization)라는 과정을 통해 인간이 직관적으로 해석하기 쉬운 형태로 가공된다. 사람이 직관적으로 이해하기 어려운 수치의 나열로 구성돼 있던 데이터가 컴퓨터 그래픽스 기술의 적용을 통해 보다 쉽게 분석할 수 있는 형태로 변형되는 것이다. 최근에는 이런 시뮬레이션 데이터의 크기와 복잡도가 점점 증가하고 있는 추세로, 이런 추세에 따라 고해상도 디스플레이 장치나 몰입형 가상현실 장치의 필요성은 점점 증가하고 있다. 이런 이유로 클러스터 시스템을 이용한 고해상도의 디스플레이 장치에서 해당 시스템에 대한 전문적인 지식을 갖추지 않은 일반 연구자가 상호작용할 수 있는 사용자 인터페이스에 대한 필요성도 높아지고 있다. 본 논문에서는 고해상도 디스플레이 장치에서 데이터를 가시화하는 프레임워크와 그 프레임워크에서 사용하는 통합 환경 인터페이스를 소개하기로 한다. 이 인터페이스는 VR Juggler와 OSG(OpenSceneGraph)를 기반으로 하며, 다양한 형태의 디스플레이 장치와 몰입형 가상현실 환경에서 시뮬레이션 데이터와 실시간 상호작용을 통한 해석을 수행하는데 필요한 기반 환경을 제공한다.

• Korean Journal of Computational Design and Engineering
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• v.14 no.2
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• pp.69-76
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• 2009

The development of a simulation system requires many sub modules such as a dynamic module, a visualization module, etc. If a different freeware is used for each sub modules, it is hard to develop the simulation system by incorporating them because they use their own data structures. To solve this problem, a high-level data structure, called Dynamics Scene Graph Data structure (DSGD) is proposed, by wrapping data structures of two freeware; an Open Dynamics Engine (ODE) for the dynamic module and an Open Scene Graph (OSG) for the visualization module. Finally, to evaluate the applicability of the proposed data structure, it is applied to the block erection simulation in shipbuilding. The result shows that it can be used for developing the simulation system.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.7
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• pp.1363-1368
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• 2016

Fast rendering speed is one of key functions to provide realistic scenes in flight simulator. However, since flight simulator mostly operates with high volume terrain data, rendering speed is reduced and changed very rapidly when it handles file containing too much vertexs. So, previous schemes make use of Level of Details (LOD) scheme to prevent this problem. But, since LOD is applied after the large number of vertexs are detected, transition between scenes is not completely smooth. To solve this problem, in this paper, we propose a new dynamic LOD scheme which controls LOD level in advance through prediction of vertex overload. To verify the proposed scheme, we implement the proposed scheme in our flight simulation through OpenSceneGraph(OSG) and identify the reduced number of vertexs and enhanced Frame Per Second (FPS) by comparing real data with predicted one.

• Journal of the Society of Naval Architects of Korea
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• v.47 no.4
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• pp.628-645
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• 2010

To perform the engagement level simulation between the underwater vehicle model and the surface model those are constituted with various systems/ sub-systems, we implemented four different federates as a federation according to the IEEE 1516 HLA (High Level Architecture) protocol that is the international standard in the distributed simulation. Those are CFCS (Command and Fire Control System) federate, motion federate, external entities (torpedos, countermeasure and surfaceship) federate, and visualization federate that interacts with OSG (Open Scene Graph)-based visualization rendering module. In this paper, we present the detailed method about the model constitution for discrete event simulation in the distributed environment. For the sake of this purpose, we introduce the DEVS (Discrete Event System Specification)-HLA-based modeling method of the CFCS federate that reflects not only the interations between models, but also commands from user and tactics manager that is separated from the model. The CFCS federate makes decisions in various missions such as the normal diving, the barrier misision, the target motion analysis, the torpedo launch, and the torpedo evasion. In the perspective of DEVS modeling, the CFCS federate is the coupled model that has the tactical data process model, command model and fire control model as an atomic model. The message passing and time synchronization with other three federates are settled by the $m\ddot{a}k$ RTI (Runtime Infrastructure) that supports IEEE 1516. In this paper, we provides the detailed modeling method of the complicated model that has hierarchical relationship such as the CFCS system in the submarine and that satisfies both of DEVS modeling method for the discrete event simulation and HLA modeling method for the distributed simulation.