• Journal of Broadcast Engineering
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• v.23 no.6
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• pp.800-812
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• 2018

In this study, we reviewed recent trends for enhancing human cognitive accessibility to social VR platform. We also proposed a practical method to predict VR sickness and improve the cognitive accessibility. In doing so, we investigated subtle changes in human body sway unconsciously made before, during, and after being exposed to extreme VR experience. The scientific assumption that VR sickness would be correlated with the subtle changes in body sway was validated. We found that participants who showed sensitive changes in the body sway before VR experience, felt more severe VR sickness than others. The findings can be practically applied in predicting susceptibility to VR sickness prior to VR experiences.

• 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.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.06a
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• pp.24-27
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• 2018

본 논문은 최신 가상현실 미디어 기술동향과 다양한 분야에서 시도해 온 VR 멀미저감 방안을 리뷰하여, 가상현실 사용자의 인지적 수용성을 높이는 방안에 대해 논의하였다. 이를 통해 최신 미디어 기술의 사용자 가치제안 방식을 분석하고 Social VR 플랫폼의 인지적 수용성을 개선하는 효율적 방안을 제안하였다. 생체신호 모니터링, VR 콘텐츠 적합도 분석, 멀미 메커니즘 조절, 신체동요측정 기반 멀미예측 등 다양한 멀미저감 방식 중 개발 비용과 사용자 수용성 측면에서 가장 효율적인 신체동요측정 기반 멀미예측 기술의 사전테스트 결과를 소개하고 적용 방안을 구체화하였다. 가상현실 체험 전 미세한 신체동요가 많은 사용자일수록 VR 멀미 민감도가 크게 증가하는 것을 확인하였다. 개인의 멀미민감도를 반영하는 본 측정 결과를 다양한 가상현실 환경에서 테스트하고 개인특성에 따른 VR 멀미 데이터베이스를 구축한다면 AI 기반의 멀미 예측기술을 구현하는데 크게 기여할 것으로 예상된다.

• 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.

• 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.

• 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.

• Science of Emotion and Sensibility
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• v.23 no.3
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• pp.79-90
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• 2020

The inconsistency in different sensory information causes virtual reality (VR) sickness. This research verifies whether the consistent sensory information reduces VR sickness within treadmill-based virtual reality. Furthermore, we examined the inconsistency between the visually perceived walking speed by optical flow in VR and the physically perceived walking speed in treadmill walking on VR sickness. In Experiment 1, participants reported VR sickness levels while experiencing an increase in the virtual reality. We compared the VR sickness level reported on the standing still condition with that on the treadmill-walking condition. Based on our results, less VR sickness and more sense of presence and immersion were reported on the treadmill-walking condition than on the standing still condition. In Experiment 2 and Experiment 3, the effect of inconsistency between perceived visual speed and perceived walking speed on VR sickness was examined. Interestingly, participants reported less sickness when the perceived visual speed was faster than the perceived walking speed, compared to when the sense of speed was consistent. These results imply that allowing participants to walk on a treadmill while experiencing virtual reality reduces VR sickness. Hence, the perceived visual-walking speed consistency is not necessarily required to reduce VR sickness.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.1012-1014
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• 2017

최근 가상현실(VR)기기와 콘텐츠가 전 세계적으로 주목을 받고 있고 많이 대중화되는 추세이다. 하지만 VR콘첸츠 체험 후 많은 이들이 사이버멀미를 호소한다. 사이버멀미는 머지않은 4차산업 발전에 도래하기 위해선 반드시 해결해야 할 불가피한 문제이다. 본 논문은 사이버멀미의 원인을 분석하고 원인에 상응한 기술적 요소에 접근하여 사이버멀미 개선 프로세스를 제안하였다.

• Journal of Korea Game Society
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• v.18 no.4
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• pp.15-32
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• 2018

In this research, SSQ is used to validate and explore effective indices for VR sickness and to diagnose the severity of each symptom. Therefore, this research used first, third person game and $360^{\circ}$ actual content which are mainly used in existing VR contents, and measured various sickness symptoms using SSQ. Also, according to the result of statistical analysis, increased the power and contribute to identify virtual reality sickness measurement method. In addition, this research examined the difference of gender, age and the experience of virtual reality using statistical methodology, and improved diagnostic capability.

• Journal of KIISE
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• v.45 no.3
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• pp.251-279
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• 2018

Users can experience cybersickness when interacting with virtual reality (VR). The symptoms of cybersickness are similar to those of motion sickness which include eye fatigue, disorientation, and nausea. Despite the longstanding interest of user's discomfort, inconsistent results have been drawn on the underlying mechanisms and solutions of cybersickness. In this study, we propose an integrated view of cybersickness connecting causes of the symptoms, human perception model, and measurements of cybersickness. Cybersickness-related factors of previous research are reorganized into content, hardware, and human factors as well as analyzed in terms of VR fidelity. Also, pros and cons that measure the degree of cybersickness are discussed.