• Journal of Korea Society of Industrial Information Systems
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• v.16 no.3
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• pp.65-72
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• 2011

Multi-touch display system has recently attracted world wide attention due to easy accessibility to the various interactive media without any specialized equipments. Especially, Microsoft Sphere(R) shows a considerable promise in treating non-fiat multi-touch display. The distinctive feature of the system is a stable multi-touch interaction on a spherical display. To extend the possibility of the interactions to the more various display surfaces, this paper propose a multi-touch interaction system in the circumstance of the irregular convex surface. The proposed method can be used efficiently in various tangible interface, for example, the interactive diorama system at the exhibition or the tangible arcade game.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.131-132
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• 2018

본 프로젝트는 Unity3D Tool 기반의 가상 체험용 VR 프로젝트를 설계하고 개발하였다. 프로젝트의 핵심 기능 및 환경은 게임 제작용 툴인 Unity를 사용하여 웹과 모바일 앱에서 다양하게 접근할 수 있도록 제작하였다. 웹에서는 키보드와 마우스로 제어하고 모바일 앱에서는 자체 컨트롤러 기능을 활용하여 이동 및 제어 처리하였다. 그리고 VR 장치를 활용한 앱 컨트롤러는 시선으로 제어 할 수 있도록 하였다. 프로젝트 활용환경의 공통적인 기능으로는 화면 중앙에 위치한 이동 포인터를 액션 이미지에 일정 시간 올려놓으면 이벤트가 발생하는 레이케스트 기능을 사용하였다. 건물 내부를 표현한 파노라마 이미지는 해당하는 각 장소마다 360' 카메라를 사용하여 촬영하여 기능을 구현하였다. 본 프로젝트는 다양한 네트워크 및 컴퓨팅 환경에서 활용할 수 있는 가상 체험 프로젝트이다. 가상 체험을 통해 가상공간에서 거리, 공간, 시간에 구애받지 않고 학교 소개 및 홍보를 위한 마케팅 효과를 가질 것이다.

• Journal of the Korea Society for Simulation
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• v.18 no.1
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• pp.53-62
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• 2009

The real data obtained from field exercises has a crucial role in modeling and simulation of a combat or a wargame. This becomes an important input especially in analyzing weapon systems realization. Many existing models have been using the mean value of the time between each fire. The firing data can be incorporated into a known probability distribution or used directly as an empirical distribution. Data of field exercises are very useful instead of the real combat outcomes. This study finds a new modeling approach and techniques to compare the data with the previously generated outcomes. This fundamental research work will continue to consider more of the various weapon systems, the sizes, and other tactical aspects.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.333-336
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• 2020

6 자유도 오디오 재현 기술은 사용자가 6 자유도를 가지는 콘텐츠 또는 응용에서 음향학적 주변 환경과 사용자의 위치에 맞는 오디오를 재현하는 기술로서, 가상 현실, 게임 등에 적용이 될 수 있다. 6 자유도 오디오는 기존의 고정된 위치에서 재생되는 채널 기반 오디오와는 다른 특징이 있어 오디오 재생 장치와 헤드폰 또는 스피커만으로 수행하던 기존의 오디오 청취 평가 방법으로 비교하고 평가하는 것이 불가능하다. 최근 MPEG 오디오 서브그룹에서는 6 자유도 오디오 재현 기술에 대한 표준화를 진행하고 있으며, 이를 평가할 수 있는 시스템도 함께 제시하고 있으며, 2019 년 12 월에는 제안한 시스템을 활용한 파일럿 테스트가 진행이 되었다. 본 논문에서는 MPEG 에서 진행한 파일럿 테스트 시스템과 평가 방법에 대하여 살펴보고, 본 기관에서 평가한 내용 및 결과에 대해 기술하며, MPEG 에서 제시한 평가 시스템이 6 자유도 오디오 재현 기술의 평가에 적절한지에 대한 의견을 제시한다.

• Journal of KIISE:Computer Systems and Theory
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• v.34 no.5_6
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• pp.228-237
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• 2007

displacement mapping enables us to add realistic details to polygonal meshes without changing geometry. We present a real-time artifacts-free inverse displacement mapping method. In each pixel, we construct a ray and trace the ray through the displacement map to find an intersection. To skip empty regions safely, we traverse the image pyramid of displacement map in top-down order. Furthermore, when the displacement map is enlarged, intersection with bilinear interpolated displacement map can be found. When the displacement map is at distance, our method supports mipmap-like prefiltering to enhance image quality and speed. Experimental results show that our method can produce correct images even at grazing view angles. Rendering speed of a test scene is over hundreds of frames per second and the influence of resolution of displacement map to rendering speed is little. Our method is simple enough to be added to existing virtual reality systems easily.

• Journal of the HCI Society of Korea
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• v.1 no.1
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• pp.45-52
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• 2006

This paper presents an image-space algorithm to real-time collision detection, which is run completely by GPU. For a single object or for multiple objects with no collision, the front and back faces appear alternately along the view direction. However, such alternation is violated when objects collide. Based on these observations, the algorithm propose the depth peeling method which renders the minimal surface of objects, not whole surface, to find colliding. The Depth peeling method utilizes the state-of-the-art functionalities of GPU such as framebuffer object, vertexbuffer object, and occlusion query. Combining these functions, multi-pass rendering and context switch can be done with low overhead. Therefore proposed approach has less rendering times and rendering overhead than previous image-space collision detection. The algorithm can handle deformable objects and complex objects, and its precision is governed by the resolution of the render-target-texture. The experimental results show the feasibility of GPU-based collision detection and its performance gain in real-time applications such as 3D games.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.843-845
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• 2016

Concomitant with development of AR(Augmented Reality) and VR(Virtual Reality), interest in location based games and augmented reality have increased and various services have been developed. Due to this, AR, VR, MR(Merged Reality) techniques are considered one of fourth industrial revolution techniques. Oculus Rift which is representative of VR technology, and HTC VIVE need separate controllers, and don't offer service such as receiving external video information when users are using devices. In the case of project Alloy, which is a MR device of Intel, this has advantages such as controlling devices through hand signals and facial expressions, and receiving external video information. In this paper, we propose tourist guide system based on current position using MR. This system makes economical tour possible by arranging tourist attraction information which is from current position of tourists in correct places through external video information using MR, location determination using GPS, tourism information search using wireless internet.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.4
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• pp.715-722
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• 2023

The purpose of this study is to revitalize rehabilitation treatment for people with physical disabilities by presenting a convergence plan between e-sports and rehabilitation exercises using AI-based metaverse. Metaverse-based e-sportscan be useful in providing sports experiences to people with physical disabilities who are unable to participate in society, and this also allows individuals with disabilities to experience sports that are difficult to actually experience. The use of metaverse will enable effective rehabilitation exercise links in vulnerable communities such as hospitals and farming and fishing villages, and provide integrated services of medical and rehabilitation movements that allow exercise data to be managed in an integrated manner. To this end, interdisciplinary experts should participate in the convergence development of e-sports and rehabilitation exercise.

• Journal of the Korea Society of Computer and Information
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• v.28 no.1
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• pp.129-136
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• 2023

In this paper, we propose the positive effects of Virtual Reality(VR) sports classes and the foundation for VR sports to become the basis of lifelong sports education through the application of physical education classes in sports virtual reality programs are to be provided. For this purpose, the effect of VR sports experience on sports satisfaction, sports immersion, and sports attitude factors was investigated for 281 elementary school students in Busan. Results It was found that VR sports experience had a significant effect on sports satisfaction, sports satisfaction had a significant effect on sports immersion and sports attitude, and sports immersion had a significant effect on sports attitude. The great advantage of sports virtual reality is that sports activities for items that are difficult to deal with in physical education classes and unpopular items will be easily performed. In addition, by using a program that links physical education classes with English and mathematics, physical education will be recognized as a convergence subject by elementary school students, and at the same time, it will become an integrated subject that can acquire fun elements and learning elements at the same time through play or games.

• The Journal of Korean Institute of Next Generation Computing
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• v.14 no.5
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• pp.31-39
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• 2018

Recently, there has been active studies to provide a user-friendly interface in a virtual reality environment by recognizing user hand gestures based on deep learning. However, most studies use separate sensors to obtain hand information or go through pre-process for efficient learning. It also fails to take into account changes in the external environment, such as changes in lighting or some of its hands being obscured. This paper proposes a hand gesture recognition method based on deep learning that is strong in external environments without the need for pre-process of RGB images obtained from general webcam. In this paper we improve the VGGNet and the GoogLeNet structures and compared the performance of each structure. The VGGNet and the GoogLeNet structures presented in this paper showed a recognition rate of 93.88% and 93.75%, respectively, based on data containing dim, partially obscured, or partially out-of-sight hand images. In terms of memory and speed, the GoogLeNet used about 3 times less memory than the VGGNet, and its processing speed was 10 times better. The results of this paper can be processed in real-time and used as a hand gesture interface in various areas such as games, education, and medical services in a virtual reality environment.