• Journal of the Korea Convergence Society
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• v.10 no.3
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• pp.135-140
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• 2019

This study is aimed at analyzing cyber motion sickness factors focus on virtual environment-based VR and real-world VR. First literature study of cyber motion sickness, 3D animations and documentaries were conducted. As a measurement tool for the degree of motion sickness, the symptom values were measured in a standardized SSQ (Simulator Sickness Questnire) questionnaire. Following the measurement, an in-depth interview was conducted based on the SSQ questionnaire. The results are as follows, First, actual environment based VR caused bigger cyber motion sickness, second, values of strong saturation of VR contents cause cyber motion sickness. This study is expected to be used as design guidelines for configuring VR early contents and to be used for cyber motion sickness research.

• Journal of the Institute of Convergence Signal Processing
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• v.19 no.3
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• pp.133-138
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• 2018

VR technology is a technology that allows a user to experience virtual reality close to reality by wearing an HMD (Head Mounted Display) device. Recently, as the interest in VR technology increases due to the 4th industrial revolution, various HMD devices are spreading. As a result, VR technology is being rapidly applied to various fields, but many of them still experience VR nausea. VR nausea is caused mainly by visual factors, unlike motion nausea, such as car nausea, sea nausea, and air nausea. Such occurrence of VR nausea may be caused by the characteristics of visual information of VR video contents, the hardware characteristics of HMD devices blocking the external visual field, or the physical specificity of individuals, and it is difficult to distinguish the causes. In this paper, we aim to analyze the characteristics of Visually Induced Motion Nausea images focusing on VR video content, which is the cause of VR nausea, in order to search for minimization of Cyber sickness occurrence.

• Journal of the Korea Computer Graphics Society
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• v.25 no.1
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• pp.23-32
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• 2019

Cybersickness is a symptom of dizziness that occurs while experiencing Virtual Reality (VR) technology and it is presumed to occur mainly by crosstalk between the sensory and cognitive systems. However, since the sensory and cognitive systems cannot be measured objectively, it is difficult to measure cybersickness. Therefore, methodologies for measuring cybersickness have been studied in various ways. Traditional studies have collected answers to questionnaires or analyzed EEG data using machine learning algorithms. However, the system relying on the questionnaires lacks objectivity, and it is difficult to obtain highly accurate measurements with the machine learning algorithms. In this work, we apply Deep Neural Network (DNN) deep learning algorithm for objective cybersickness measurement from EEG data. We also propose a data preprocessing for learning and network structures allowing us to achieve high performance when learning EEG data with the deep learning algorithms. Our approach provides cybersickness measurement with an accuracy up to 98.88%. Besides, we analyze video characteristics where cybersickness occurs by examining the video segments causing cybersickness in the experiments. We discover that cybersickness happens even in unusually persistent changes in the darkness such as the light in a room keeps switching on and off.

• TTA Journal
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• s.175
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• pp.88-94
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• 2018

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.449-450
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• 2018

가상현실(VR) 기술을 활용한 가상직무체험은 실제 업무 경험과 유사한 경험을 습득할 수 있기 때문에 기존 e-러닝 및 동영상 교육에 비해 학습몰입도와 효과가 뛰어나다. 그러므로 한국전력공사에서는 (주)포미트와 함께 접근이 어렵고 위험한 작업이 많은 변전설비의 정비를 위한 가상현실(VR) 교육콘텐츠를 제작하였다. 가상현실(VR) 기술이 적용된 교육콘텐츠의 경우 교수내용의 적정성 및 효과성 외에도 반복/장기 학습이 가능하도록 하기 위하여 콘텐츠의 화질, VR 멀미를 최소화 할 수 있는 초당 프레임 수 등 학습자 관점에서의 기술 적용에 대한 연구가 필요하다. 하여 본 연구에서는 "변전설비 정밀점검 절차 교육콘텐츠"를 대상으로 가상현실(VR) 교육콘텐츠의 구현 방법에 대해 서술하고자 한다.

• Journal of the Korea Computer Graphics Society
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• v.22 no.3
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• pp.31-41
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• 2016

This study proposes suitable input processing technique for producing the mobile platform based virtual reality contents. First of all, we produce the mobile platform based virtual reality interactive contents to be used in experiments for improve user's immersion who experience the virtual reality contents, get interests and design the input processing that easily controllable. Then design the input processing technique in two methods, with gamepad that accessibility to mobile and with directly through user's gaze to interface. Through virtual reality based input processing technique that we proposed, we analyse effect of improve user's immersion, cause of get interests and whether provide the convenience or not for controlling contents through experiments. Moreover we verify whether bring negative psychological elements like sickness, fatigue or not.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.155-158
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• 2018

VR기기를 착용하고 주변 시야가 차단된 상태로 일정 시간 사용하면, 다소 편차는 있지만 누구에게나 사이버 멀미 현상이 쉽게 일어날 수 있다는 문제점이 VR 관련 콘텐츠 개발자 및 사용자들에게 대두되고 있다. 이 문제를 현시점에서는 완전히 해결할 수는 없지만, 일반적으로 VR 게임을 개발할 때 사전에 숙지해야 할 중요한 부분 중 하나이다. 따라서 사용자가 VR 게임을 체험하기 전에 사이버 멀미를 예방하기 위해, 미리 개발 과정에서부터 사이버 멀미가 일어날 수 있는 변수를 최대한 줄이며 개발하는 여러 가지 방안에 대해 연구하였다. 본 논문에서는 먼저 고려해야 할 사항으로 사이버 멀미 현상이 일어나는 원인을 분석하고, 이를 예방할 수 있는 방법을 모색하여 상용 엔진인 Unity3D를 이용한 VR 게임 개발에 실제로 적용하였다.

• The Journal of the Korea Contents Association
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• v.17 no.4
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• pp.200-208
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• 2017

Despite a rapid market growth in VR, cyber sickness has become the most serious problem in terms of user experience. The aim of this study is to verify whether there are differences in user's perception of cyber sickness by the point-of-view and the movement in VR contents. An experimental testing of game playing with VR headset was conducted on the effects of two conditions: first-person and third-person views in the point-of-view condition, and yaw - pitch rotations in the head movement condition. The results showed that cyber sickness worsened in the first-person point-of-view and in the yaw rotation movement. Point-of-view and movement had main effects on the cyber sickness, but an interaction effect between point-of-view and movement was not found. Based on the findings, along with reducing VR sickness, we proposed practical implications for VR contents planning for building balanced VR user experience. Positive VR experience can be reinforced through visual design, multi-modal interface design, and experience marketing for the optimal level of contents immersion. A future research was suggested on the roll rotation for diverse content genre development.

• Journal of the Korea Computer Graphics Society
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• v.27 no.3
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• pp.55-63
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• 2021

This study proposes an interface for providing mobile interaction suitable for mobile virtual reality (VR) and analyzes it through comparative experiments. The proposed interface is premised on not using additional equipment except for the mobile head-mounted display(HMD) in consideration of accessibility and usability. And the interface that controls the movement interaction using the user's gaze is designed in two phases. The key is to minimize the occurrence of negative factors such as VR sickness that can be caused by straight line movement in virtual reality. To this end, two phases are designed: an interface composed of forward/backward buttons to move the gaze toward the ground, and an interface composed of left and right buttons on the front in consideration of the gaze change in real walking motion. An application that can compare and analyze movement interactions through the proposed interface is produced, and a survey experiment is conducted to analyze the user's satisfaction with the interface experience and the negative impact on the movement process. It was confirmed that the proposed movement interaction reduced negative effects such as VR sickness along with a satisfactory interface experience for users.

• The Journal of the Convergence on Culture Technology
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• v.8 no.5
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• pp.603-611
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• 2022

As the era of metaverse approaches, there are challenges that need to be solved. Among them, 'cyber motion sickness' is a representative problem from 2016;when VR technology began to attract attention. According to the theory of sensory conflict, motion sickness is caused when the perceived direction of motion information and the expected value are not the same. The paper was written to theoretically explore the relationship between brain cognition and cyber motion sickness, and to prove the effect of user immersion on motion sickness symptoms based on this. Through the SSQ experiment, it was found that the rotation value of the camera aggravates the symptoms of cyber motion sickness and can alleviate cyber motion sickness by increasing the immersion of the game by giving the viewer visual and shift missions to solve. This study was conducted to solve the problem of cyber motion sickness during the process of developing the VR rhythm game "beatale", and it is expected to be the basis for improving cyber motion sickness not only in the development of the project but also in the production of VR contents in the future.