We present an elevating tangible block, G-raff that supports spatial interaction in a tabletop computing environment. The elevating head part of G-raff moves according to the given height and angle data. We adopted two rollable metal tape structures to create large movements with a small volume block. On the head part, a smartphone can be mounted either horizontally or vertically. G-raff becomes a device that can connect a mobile device with a tabletop computer, thus a new spatial representation and control interaction is made. This paper introduces the design details, key features and applications of G-raff. We report on the results of a preliminary user study and discuss future work to improve the elevating device. This work contributes to maximizing the availability of augmented reality space above the tabletop display.
Kim, CM., & Nam, TJ. (2015, April). G-raff: an elevating tangible block for spatial tabletop interaction. In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems (CHI '15). Association for Computing Machinery, New York, NY, USA, 4161–4164. https://doi.org/10.1145/2702123.2702444 

Sim, J., Kim, CM., Nam, SW., & Nam, TJ. (2014, October). G-raffe: an elevating tangible block supporting 2.5 D interaction in a tabletop computing environment. In Adjunct Proceedings of the 27th Annual ACM Symposium on User Interface Software and Technology (UIST '14 Adjunct). Association for Computing Machinery, New York, NY, USA, 87–88. https://doi.org/10.1145/2658779.2658789

심준구, 남택진, "G-raffe: 2.5D 공간을 활용하는 능동형 탠저블 블록 개발 = G-raffe: An active tangible block using 2.5D space", 한국 HCI 학회 학술대회 2013, 강원 하이원리조트, KO, 2013.01, pp.278~280
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