가상현실에서의 속도와 밝기는 착용형 디스플레이를 사용하는 청각장애 학습자에게 영향을 미치는가?
Do the Speed and Brightness in the Virtual Reality Matter for Hearing Impaired Learners with Head Mounted Display?
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초록
이 연구는 착용형 디스플레이를 활용한 몰입형 가상환경에서 그래픽 객체의 밝기 및 조작속도에 대해서 청각장애인과 비장애인간의 지각민감도를 비교 분석할 목적으로 실시되었다. 연구를 위해서 한국장애인 고용공단의 청각장애 학습자 9명과 비장애 학습자 9명이 참가하여 가상환경에서의 객체 밝기 및 조작속도에 대한 지각요소를 비교하고, 색대비에 대한 선호도를 비교했다. 지각민감도의 비교를 위해서 가상환경의 밝기(3 수준)와 조작속도(3 수준)에 따른 지각요인 하위요소인 매력성, 방향성, 만족도를 반복측정 대비분석을 통해 분석하였다. 색대비 선호도 비교를 위해서 시험참가자에게 색상대비 조합을 구성하도록 했다. 연구결과에 따르면 매력성과 만족도에 대한 밝기의 주효과를 확인하였고, 밝기와 조작속도에 따른 방향성과 만족도의 집단간 차이를 확인하였다. 색상대비선택에서는 장애와 비장애 학습자간의 선호도 차이를 확인할 수 있었다. 이 연구는 그래픽 중심의 사용자들의 조도와 색채대비 그리고 조작반응 속도에 대한 사용성 평가를 통해 가상학습 환경 설계를 위한 가이드라인을 제시하는데 기여할 것으로 판단된다.
Abstract
This study aims to analyze perceptual sensitivity between hearing-impaired learners and non-hearing-impaired learners in Immersive Virtual Learning Environment. Nine hearing-impaired students(Korea Employment Agency for the Disabled) and nine non-hearing impaired learners participated into this research, and perceptual sensitivity and color preference of virtual learning environment’s objects according to differentiated illuminance and operating speed. As for the perceptual sensitivity analysis, brightness (3 levels) and operating speed(3 levels) were applied for the virtual learning environment respectively, and a repeated measured ANOVA was applied to examine the effects on perceptional factors of attractive, navigable, and inviting. Regarding color preference, participants were asked to select most preferred color combination with a learning object and background color of a machine. The analysis by brightness and operating speed showed three results. First, the main effects of brightness on ‘attractive’ was found, but no significant effect by operating speed. Further no significant difference was found between hearing impaired and no-impaired students. Second, significant interaction was found on the navigable by operating speed and students. There was a significant difference between student groups when the operating speed was slow. However, no difference was found at high operating speed. Third, the brightness had a significant main effect on inviting, but no other effects were found. For the color preference, there was preference difference between hearing-impaired learners and non-hearing-impaired learners in immersive virtual learning environment. This study will contribute to suggesting guidelines for designing virtual learning environment through usability test of users on illuminance, color contrast, and operating speed.
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