Xingyao Yu

Abstract

We introduce AVAR, a prototypical implementation of an agile situated visualization (SV) toolkit targeting liveness, integration, and expressiveness. We report on results of an exploratory study with AVAR and seven expert users. In it, participants wore a Microsoft HoloLens device and used a Bluetooth keyboard to program a visualization script for a given dataset. To support our analysis, we (i) video recorded sessions, (ii) tracked users' interactions, and (iii) collected data of participants' impressions. Our prototype confirms that agile SV is feasible. That is, liveness boosted participants' engagement when programming an SV, and so, the sessions were highly interactive and participants were willing to spend much time using our toolkit (i.e., median ≥ 1.5 hours). Participants used our integrated toolkit to deal with data transformations, visual mappings, and view transformations without leaving the immersive environment. Finally, participants benefited from our expressive toolkit and employed multiple of the available features when programming an SV.

Abstract

We investigate how Mixed Reality (MR) can be used to guide human body motions, such as in physiotherapy, dancing, or workout applications. While first MR prototypes have shown promising results, many dimensions of the design space behind such applications remain largely unexplored. To better understand this design space, we approach the topic from different angles by contributing three user studies. In particular, we take a closer look at the influence of the perspective, the characteristics of motions, and visual guidance on different user performance measures. Our results indicate that a first-person perspective performs best for all visible motions, whereas the type of visual instruction plays a minor role. From our results we compile a set of considerations that can guide future work on the design of instructions, evaluations, and the technical setup of MR motion guidance systems.

Abstract

We designed a within-subject experiment to compare visual discomfort to preteen users caused by using head-mounted displays (HMD) and tablet computers for an hour. 18 participants younger than 13 years old were recruited to fulfill a series of similar painting tasks under both display conditions. Visual fatigue was measured with visual analog scale before and after experiment and during the break of experiment. The results indicated that HMD had a trend to bring higher visual fatigue than tablet computer during the exposure of 1 hour. Although the symptoms of visual discomfort disappeared after resting, there is need for preteen-specific head-mounted displays.

Abstract

The aim of this paper is to reduce simulator sickness caused by the low refresh rate of display in smartphone-based VR system. Without regard to the improvement of hardware, the method proposed in this paper reduces simulator sickness by adding static symbol on the screen of the smartphone. A series of user-participation experiments were done to validate the effectiveness of the method. Participants' responses to the symbol with different textures (cross or Minion logo) and in different positions (the center or near the corners) were assessed by Simulator Sickness Questionnaire (SSQ). The preliminary results demonstrate that the existence, the position and complexity of the symbols can be factors in relieving symptoms of simulator sickness.