In this paper, we present a new augmented reality (AR) head mounted display (HMD)-based balance rehabilitation method. This method assesses the individual’s postural stability quantitatively by measuring head movement via the inertial measurement unit sensor integrated in the AR HMD. In addition, it provides visual feedback to train through holographic objects, which interacts with the head position in real-time. We implemented applications for Microsoft HoloLens and conducted experiments with eight participants to verify the method we proposed. Participants performed each of three postural tasks three times depending on the presence or absence of augmented reality, the center of pressure (COP) displacement was measured through the Wii Balance Board, and the head displacement was measured through the HoloLens. There are significant correlations (p < 0.05) between COP and head displacement and significant differences (p < 0.05) between with/without AR feedback, although most of them were not statistically significant likely due to the small sample. Despite the results, we confirmed the applicability and potential of the AR HMD-based balance rehabilitation method we proposed. We expect the proposed method could be used as a convenient and effective rehabilitation tool for both patients and therapists in the future.

With the recently developed glass type devices, augmented reality is expected to provide more intuitive interaction and be actively used in work environments leaving the hands free. In addition, since eco-friendly new types of cars were launched in the automobile industry, there has been a shortage of skilled maintenance personnel. In order to solve this problem, using augmented reality technology based on Hololens can make it possible to deliver the exact information in real time in various maintenance situations. Therefore, this study intends to evaluate, compare and analyze the user experiences of augmented reality contents in the field of car maintenance between mobile devices and Hololens and use the results as the materials for creating novel services in the future.

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This study aimed to formulate a hydrogel membrane containing chitosan (CS) and virgin coconut oil (VCO) using repeated cycles of freezing and thawing (F-T) for wound dressing applications. This study evaluated the effects of degree of hydrolysis of polyvinyl alcohol (PVA), solution concentration and thickness, number of F-T cycles, CS proportion on the sensory properties, swelling ratio, and gel fraction of hydrogels. The antibacterial ability of PVA/CS/VCO membrane against methicillin-sensitive Staphylococcus aureus, methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans was evaluated by disk diffusion method. The results showed that PVA with a high degree of hydrolysis (over 99%) easily generated hydrogel after several F-T cycles. The thicker the hydrogel membrane or the higher the concentration of PVA solution was, the lower the flexibility, elasticity, swelling ratio was, and the higher the gel fraction was. The formula including 10% PVA solution, the ratio of CS to PVA is 40%, 5% w/w VCO, through 3 F-T cycles created hydrogel with suitable properties and good antibacterial activity.