• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.150-153
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• 2022

최근 XR은 LED스크린의 VR과 그 LED 스크린의 외부영역을 AR 그래픽으로 덮는 방법으로 LED에서 표현되는 VR영상과 확장된 AR의 효과로 LED VR의 확장의 개념으로 가상환경 제작으로서 많이 시도 되고 있다. 그러나, 여전히 LED 스크린의 VR에서 어떤 가상의 객체가 AR로 튀어 나올 때 타이밍을 맞추어 전환해야 할 경우 부자연스럽거나 동기가 맞지 않아 합성결과가 어긋나 품질이 떨어지며, 여러 객체를 동시에 수동으로 전환시켜야 할 때 객체의 제어에 어려움이 많을 수 있다. 본 논문에서는 그래픽 오브젝트가 VR과 AR의 경계를 오갈 때 자동으로 자연스럽게 전환/합성 가능하도록 하는 'Culling 박스'와 또, 여러 렌더링 머신에서 같은 오브젝트 제어를 동시에 제어 가능한 'TCP/IP 기반의 원격제어 UI'를 설명한다. 컬링박스는 전환해야 할 객체가 많은 복잡한 장면에서 모든 오브젝트가 일정 경계에서 자동으로 전환되며, 원격제어 UI의 타임라인 에디터와 이벤트 제어메뉴 UI를 통하여, 각각의 다른 머신의 시퀀스 및 오브젝트들을 제어 가능하여 효율적인 XR제작이 가능함을 확인 하였다.

• The Journal of the Korea Contents Association
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• v.18 no.5
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• pp.420-431
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• 2018

This study approaches the subject of satisfaction and persistent use intention based on presence based on virtual reality (VR). VR presence, user characteristic, and VR sickness, content satisfaction and system satisfaction, and continued use intention through this of 569 men and women commissioned by the survey agency were investigated. In the content of the study, the constituent factors of VR presence, an independent variable, were set as realism, immersion, and interaction. The user characteristics were set as the individual 's propensity to innovate, the degree of immersion, and the experience of using VR. VR Presence, User Characteristics, VR Sickness of Intention of Continuous Usage were set as research problems and models. Eight hypotheses were adopted in the analysis of the research problem applying the structural equation modeling (SEM) model. In conclusion, this study suggests that content satisfaction, which has the greatest influence on VR content satisfaction and persistent intention, is suggested.

• Journal of the Korea Society for Simulation
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• v.13 no.2
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• pp.45-52
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• 2004

This paper presents a prototype visualization system of mixed reality for a VR flight simulator. The chroma key technique is used to build the mixed reality model for a VR flight simulator. The Daedeok science town can be visualized in real time according to the rider control. He can also see his own hand/foot operating the control stick/rudder as well as virtual environment projected to the blue-screen using a video-see-through HMD.

• Journal of Broadcast Engineering
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• v.26 no.5
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• pp.508-518
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• 2021

Recently as a result of covid 19, it has emphasis on the importance of non-contact. VR content has been attracting attention as an alternative to visual arts, media art, new media exhibitions and performances with limited offline activities. Although interest in 360 VR video contents such as VR contents for exhibitions and performances is increasing, research on immersion and satisfaction is focused on games and animation VR contents. In this paper, it verified the effect of the difference in the position and height of the VR camera in exhibitions and performances on the user's presence and satisfaction. For this experiment, the presence and satisfaction were measured after experiencing the VR contents of the convergence exhibition and performance filmed at different locations and heights. As a result of the experiment, the difference of VR camera's position had a significant effect on presence and satisfaction, the difference of VR camera's height had a significant effect only Realistic immersion of the presence.

• Journal of the Korea Computer Graphics Society
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• v.28 no.3
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• pp.67-77
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• 2022

The sense of touch by natural wind is one of the most common feels that every person experiences in daily life. However, it has been rarely studied how natural wind can be reproduced in a VR environment and whether the multisensory contents equipped with artificial winds do improve human emotion or not. To address these issues, we first propose a wind reproduction VR system guided by video and wind capture data and also study the effect of the system on positive affect. We collected wind direction and speed data together with a 360-degree video on a yacht. These pieces of data were used to produce a multisensory VR environment by our wind reproduction VR system. 19 college students participated in the experiments, where the Korean version of Positive and Negative Affect Schedule (K-PANAS) was introduced to measure their emotions. Through the K-PANAS, we found that 'inspired' and 'active' emotions increase significantly after experiencing the yacht VR contents with artificial wind. Our experimental results also show that another emotion, 'interested', is most notably affected depending on the presence of the wind. The presented system can be effectively used in various VR applications such as interactive media and experiential contents.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.8 s.227
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• pp.1116-1124
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• 2004

In these days, a vehicle simulator has been developed with a VR(Virtual Reality) system. A VR system must provide a vehicle simulator with natural interaction, sufficient immersion and realistic images. In addition, a VR system must present a driver with the realistic driving situation. To achieve these, it is important to obtain a fast and uniform rendering performance regardless of the complexity of virtual worlds. In this paper, the factors to improve the reality for the VR based vehicle simulator have been investigated. For the purpose, the modeling and the rendering methods which offer an improved performance for complex VR applications as the 3D road model have been implemented and verified. Then, we experiment on the influence of graphic and sound factors to the driver, and analyze each result for improving the reality such as the driver's viewport, the form of texture, the lateral distance of the side object, and the sound effect. These factors are evaluated on the driving system which is constructed for qualitative analysis. The research results could be used for improving the reality of the VR based vehicle simulator.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.107-109
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• 2016

본 연구는 사용자의 신체 맞춤형 3D 가상모델에 VR을 이용한 패션 코디네이션이 가능하도록 설계한 시스템을 제안한다. 특별히 사용자의 신체 각 부위의 정보에 따라 3D모델을 조정할 수 있으며 의상데이터는 3D asset Database에서 최적의 조건으로 선별되어 VR 환경에서 코디네이션이 가능하도록 설계되었다. 따라서 사용자에게 가장 적합한 의상 정보를 현실감 있게 제공하여 만족도를 높일 것으로 기대한다. 본 시스템은 온오프라인에서 모두 활용 가능하며 가상 패션쇼, 가상 디자인, 패션 교육 등에 연계 가능하다.

• Journal of Digital Convergence
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• v.17 no.1
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• pp.295-300
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• 2019

Modern society is the era of convergence, and storytelling requires the necessity of storytelling in which two types of data types, emotional stories and information, are fused. Particularly, in the case of VR contents, the user must directly participate in the content and select the information through the process of freely searching $360^{\circ}$ space, so that the user can interact with the content immediately. Therefore, there is a limit to access to the existing storytelling method, and it is considered that the implementation of 'convergent storytelling' that meets two areas of sensitivity and information is considered to be an urgent genre. In this paper, we focus on the spatial characteristics of VR contents, and then, as a way to effectively implement 'convergent storytelling' in VR contents, We propose a custom system by organizing the type into a circle structure. Based on this, it is expected that the technology will be developed into a research of a personalized system that meets two areas of emotion and information by utilizing the context recognition process for VR content and interaction in the fourth industrial revolution era.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.05a
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• pp.107-113
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• 2002

We examined the psychophysiological effects of navigation in a virtual reality (VR). Subjects were exposed to the VR, and required to detect specific objects. Ten electrophysiological signals were recorded before, during, and after navigation in the VR. Six questionnaires on the VR experience were acquired from 45 healthy subjects. There were significant changes between the VR period and the pre-VR control period in several psychophysiological measurements. During the VR period, eye blink, skin conductance level, and alpha frequency of EEG were decreased but gamma wave were increased. Physiological changes associated with cybersickness included increased heart rate, eye blink, skin conductance response, and gamma wave and decreased photoplethysmogram and skin temperature. These results suggest an attentional change during VR navigation and activation of the autonomic nervous system for cybersickness. These findings would enhance our understanding for the psychophysiological changes during VR navigation and cybersickness.

• Journal of Broadcast Engineering
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• v.22 no.6
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• pp.808-816
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• 2017

360 VR video systems has become important to provide immersive effect for viewers. The system consists of stitching, projection, compression, inverse projection, viewport extraction. In this paper, an efficient luminance compensation technique for 360 VR video sequences, where feature extraction and histogram equalization algorithms are utilized. The proposed luminance compensation algorithm enhance the performance of stitching in 360 VR system. The simulation results showed that the proposed technique is useful to increase the quality of the displayed image.