• Journal of the Korea Society of Computer and Information
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• v.17 no.12
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• pp.209-217
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• 2012

In this paper, I proposed new system that a user makes modeling 3D symmetric pottery using mouse and can confirm the result immediately in internet browser. The main advantage of proposed system is that users who have no specialized knowledge about 3D graphic can easily create 3D objects. And a user can use it that has only PC connected network and mouse without additional devices as like expensive haptic and camera device. For developing proposed system, VRML/X3D that is International Standard language for virtual reality and 3D graphics was used. Because it was born based on internet that is different from other 3D graphic languages, it was able to interact and navigate with users. With those features and high completeness of 3D pottery realization using mouse considered, the system may be useful and is superior in performance to other pottery modeling system.

• The Journal of Korean Institute of Next Generation Computing
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• v.14 no.6
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• pp.66-74
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• 2018

Recently, there has been active studies on hand gesture recognition to increase immersion and provide user-friendly interaction in a virtual reality environment. However, most studies require specialized sensors or equipment, or show low recognition rates. This paper proposes a hand gesture recognition method using Deep Learning technology without separate sensors or equipment other than camera to recognize static and dynamic hand gestures. First, a series of hand gesture input images are converted into high-frequency images, then each of the hand gestures RGB images and their high-frequency images is learned through the DenseNet three-dimensional Convolutional Neural Network. Experimental results on 6 static hand gestures and 9 dynamic hand gestures showed an average of 92.6% recognition rate and increased 4.6% compared to previous DenseNet. The 3D defense game was implemented to verify the results of our study, and an average speed of 30 ms of gesture recognition was found to be available as a real-time user interface for virtual reality applications.

• Journal of the Korea Society of Computer and Information
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• v.16 no.1
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• pp.163-173
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• 2011

In this paper, we propose a new paradigm of augmented reality board game environment and a portable game assistant(PGA) which can help gamers with strategy information. Previous AR board games consist of a private and public space. The public space provides rules of the game and shows the scene of game. And the gamers control game pieces in the public space. The previous games use the RFIDs for recognizing positions of the pieces, and the VR/AR environment for providing the scene of the game. However the RFIDs are expansive, and the VR/AR environment is inconvenient because it uses additional devices: the DataGlove, the digital pen, and the HMD. The proposed system recognizes positions of real pieces using the computer vision technique, and uses a monitor to provide dynamic effects. In the private space, previous systems provide entire screen of game and position of specific pieces, but cannot be controled the pieces by gamers. Therefore, in this system, we provide PGA that helps the user to plan of the strategy individually using universally mobile. The PGA helps to plan the strategy in the individual area, and to play easily in the side of the user's convenience.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.38 no.6
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• pp.611-622
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• 2020

As the advancement of technologies on indoor positioning systems and measuring devices such as LiDAR (Light Detection And Ranging) and cameras, the demands on analyzing and searching indoor spaces and visualization services via virtual and augmented reality have rapidly increasing. To this end, it is necessary to model 3D objects from measured data from real-world structures. In addition, it is important to store these structured data in standardized formats to improve the applicability and interoperability. In this paper, we propose a method to construct IndoorGML data, which is an international standard for indoor modeling, from point cloud data acquired from LiDAR sensors. After examining considerations that should be addressed in IndoorGML data, we present a construction method, which consists of free space extraction and connectivity detection processes. With experimental results, we demonstrate that the proposed method can effectively reconstruct the 3D model from point cloud.

• Journal of Practical Engineering Education
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• v.16 no.1_spc
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• pp.1-9
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• 2024

The introduction of smart factory digital twins is a concept that has already been proposed to increase productivity in the manufacturing industry through CPS(Cyber Physics System), and has been applied to specific industrial process stages or partially introduced in stages where simulation is required. However, with the recent development of the 4th Industrial Revolution technology, it is receiving attention again along with XR (Extended Reality) technology. However, because there are not many effective cases, this study analyzed the devices, equipment, and technology of the manufacturing process to build a digital twin applying digital threads and synchronized signals and information to control, remote control, and produce intelligent process automation equipment. A platform capable of analyzing information was proposed and developed. Through this, we designed and built an XR content service platform that can support artificial intelligence and developed it to enable control, remote control, and analysis of production information. A possible platform was proposed and developed. We hope that this study will be helpful in conducting research on many cases, and in the future, expanded research on increasing productivity in each part of the process and production is needed through intelligent models.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.421-424
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• 2002

본 연구에서는 ARM720T core를 사용한 보드에서 머리 전달 함수(HRTF)를 이용한 입체음향 시스템을 구현하였다. ARM720T core를 탑재한 EP7312칩은 저전력 고성능 프로세서로서의 이점을 갖고 있기 때문에 HRTF의 특성을 이용한 입체음향 실시간 구현이 가능하다. 또한 ARM 프로세서를 사용함으로, DAC제어부 부분을 제외한 메인 프로세싱 부분은 ARM 계열의 다른 프로세서에서도 쉽게 사용 가능하단 이점이 있다. HRTF를 이용하여 2채널의 입체음향을 구현하는 방식은 콘볼루션에서 많은 계산량이 소요된다. 본 연구에서는 실시간 구현 시 계산량을 줄이기 위해 시간영역의 콘볼루션을 사용하지 않고 주파수 영역에서의 가중 중복 합산방식을 이용하여 계산하였다. 본 연구의 연구 결과는 가상현실이나 방송음향장비 뿐만 아니라 저전력을 요구하는 휴대용 멀티미디어 기기에서 MP3/AAC/WMA와 같은 오디오 압축 장치부분에 활용되어 질 수 있다.

• Journal of Internet of Things and Convergence
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• v.2 no.4
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• pp.21-25
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• 2016

In this paper, we review curriculum of VR related Departments in 2-3 years colleges. We gather the educational requirements from the current and future VR industry, and we survey the VR short education courses and the curriculum. The demand for VR content is expected to more than triple by 2020 compared to the equipment industry. Therefore, a VR course at a practical two-year college should have a lot of contents-oriented curriculum.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.619-621
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• 2005

햅틱 장치를 이용한 변형체의 실시간 시뮬레이션은 가상현실을 구축하기 위한 중요한 기술의 하나로서 최근에 크게 각광받고 있다. 본 연구에서는 햅틱 장비와 변형체의 정확한 인터페이스를 구축하기 위하여 변형체의 물리적 특성을 고려한 연속체적 모델인 유한요소법을 통한 선행해석을 수행한다. 변형체와 햅틱 장치의 상호작용 과정에서 발생하는 변형과 반력을 사용자에게 실시간으로 제공하기 위하여 선행해석 결과를 이용한 변형체의 정적 시뮬레이션을 구현한다. 이와 함께 햅틱 장치와 접촉이 이루어지는 부분의 변형을 보다 자연스럽게 표현하기 위하여 적응적 유한요소법인 s-adaptive 방법을 적용하였으며 햅틱 장치와 접촉이 끝난 후의 변형체가 평형 상태로 돌아가는 과정을 모사하기 위하여 Newmark scheme을 통한 동적 시뮬레이션을 구현한다. 또한 최적화 행렬 연산 함수인 BLAS와 LAPACK을 이용하여 행렬 연산을 빠르게 수행하고 효율적인 메모리 사용 추구한다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.220-222
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• 2001

가상 현실을 요하는 멀티미디어 콘텐츠, DC-Title, 게임기등의 멀티미디어에서는 고급 장비의 사용 없이 2개의 스피커를 이용하여 3차원 효과를 들을 수 있는 입체 음향 기법이 활용된다. 2채널 3D오디오 방식에 있어서 위치음 효과는 머리전달함수(HRTF)를 사용하여 얻을 수 있다. 콘볼루션을 이용하는 기존의 방식들은 많은 계산량과 HRTP DB 저장을 위한 큰 메모리 용량을 요구한다. 따라서 실시간 구현이 어려울 뿐 아니라 고속 DSP를 사용해야 하는 단점을 가진다. 본 연구에서는 주파수 영역 분석법의 하나인 MDCT를 이용함으로써 계산량을 줄임과 도시에 HRTP DB의 데이터 양도 줄인다. 결과적으로 실시간 처리가 가능할 뿐 아니라 저속 DSP를 사용하여 구현 가능하게 함으로써 저가로 구현 할 수 있다. 본 연구 결과는 기존 제품들 중 스펙트럼 분석법을 이용한 오디오 압축 장치에 활용될 수 있는데 예를 들면 MP3/AAC/WMA Player에 적용하여 3차원 입체 음향을 구현 할 수 있다.

• Annual Conference of KIPS
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• 2020.11a
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• pp.648-650
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• 2020

본 프로젝트는 최근 주목받고 있는 Unity 3D 엔진 및 IoT 센서, 가상현실 기술을 활용하여 작업자들이 시간과 장소의 제약 없이 현실감 있는 환경에서 효율적으로 항만 유지/보수 교육을 받을 수 있는 환경을 제공하고자 한다.