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Chat Wacharamanotham


Publications by Chat Wacharamanotham (bibliography)

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Wacharamanotham, Chat, Hurtmanns, Jan, Mertens, Alexander, Kronenbuerger, Martin, Schlick, Christopher and Borchers, Jan (2011): Evaluating swabbing: a touchscreen input method for elderly users with tremor. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 623-626. http://dx.doi.org/10.1145/1978942.1979031

Elderly users suffering from hand tremor have difficulties interacting with touchscreens because of finger oscillation. It has been previously observed that sliding one's finger across the screen may help reduce this oscillation. In this work, we empirically confirm this advantage by (1) measuring finger oscillation during different actions and (2) comparing error rate and user satisfaction between traditional tapping and swabbing in which the user slides his finger towards a target on a screen edge to select it. We found that oscillation is generally reduced during sliding. Also, compared to tapping, swabbing resulted in improved error rates and user satisfaction. We believe that swabbing will make touchscreens more accessible to senior users with tremor.

© All rights reserved Wacharamanotham et al. and/or their publisher

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Voelker, Simon, Weiss, Malte, Wacharamanotham, Chat and Borchers, Jan (2011): Dynamic portals: a lightweight metaphor for fast object transfer on interactive surfaces. In: Proceedings of the 2011 ACM International Conference on Interactive Tabletops and Surfaces 2011. pp. 158-161. http://dx.doi.org/10.1145/2076354.2076384

We introduce Dynamic Portals, a lightweight interaction technique to transfer virtual objects across tabletops. They maintain the spatial coherence of objects and inherently align them to the recipients' workspace. Furthermore, they allow the exchange of digital documents among multiple users. A remote view enables users to align their objects at the target location. This paper explores the interaction technique and shows how our concept can also be applied as zoomable viewport and shared workspace.

© All rights reserved Voelker et al. and/or ACM Press

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Weiss, Malte, Wacharamanotham, Chat, Voelker, Simon and Borchers, Jan (2011): FingerFlux: near-surface haptic feedback on tabletops. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 615-620. http://dx.doi.org/10.1145/2047196.2047277

We introduce FingerFlux, an output technique to generate near-surface haptic feedback on interactive tabletops. Our system combines electromagnetic actuation with permanent magnets attached to the user's hand. FingerFlux lets users feel the interface before touching, and can create both attracting and repelling forces. This enables applications such as reducing drifting, adding physical constraints to virtual controls, and guiding the user without visual output. We show that users can feel vibration patterns up to 35 mm above our table, and that FingerFlux can significantly reduce drifting when operating on-screen buttons without looking.

© All rights reserved Weiss et al. and/or ACM Press

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