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Follow Moving Things in Virtual World
Jyh-Ming Lien,Young J. Kim 한국HCI학회 2016 한국HCI학회 학술대회 Vol.2016 No.1
There are many scenarios in virtual reality and video games where it is desirable to assist human user and maximize his/her visibility of a group of moving targets. This paper presents a new type of space partitioning strategy based on the idea of visibility integrity to enhance the user experience in the context of solving the group following problem. This problem involves computing the motion for a mobile camera to maximize its visibility of a coherent group of targets moving about a space filled with obstacles. Current solutions to this problem involve approximation of the visibility between different areas of the space. These areas are usually defined by simple shapes such as discs, squares or rectangles, and have always been constructed somewhat arbitrarily as long as they can collectively cover the space. Consequently, such partitioning strategy usually suffers from both over partitioning and under partitioning in different regions of a given environment, thus significantly hinders the ability to provide reliable pursuit of a group. To address this challenge, we have developed a visibility-integrity roadmap data structure that provides a partition of the space into regions of similar visibility.
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Recent progress in shape-transformable materials and their applications
Yu-Ki Lee,Juhee Kim,Jyh-Ming Lien,Young-Joo Lee,In-Suk Choi 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.3
Carefully designed geometries and materials can program desired shapes. In this review, we introduce shape-transformablematerials and their recent applications in electronic devices and robots. Strain-guiding shape transformation can be achievedby geometry design or materials design, which can program the magnitude and direction of strain to develop desired shapes. For the geometry design, we discuss origami and kirigami, which transform 2D sheet materials into desired 3D shapesvia local deformations caused by fold creases and cut openings. The desired shape can be programmed by controlling thelength and alignment of folds or cuts. For the material design, heterogeneities in materials can develop strain driven shapetransformation. Heterogeneities in materials include those in anisotropic materials, graded materials, or mixtures of differentmaterials. Shape-transformable materials can be prepared by introducing heterogeneities into stimuli-responsive materials,including inflatable materials, shape memory polymers, liquid crystal elastomers, and hydrogels. The development ofshape-transformable materials has led to innovations in energy storage devices, displays, sensors, epidermal electronics,actuators, and robots.
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