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Hsu-Sheng Ko


Publications by Hsu-Sheng Ko (bibliography)

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Bragdon, Andrew and Ko, Hsu-Sheng (2011): Gesture select:: acquiring remote targets on large displays without pointing. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 187-196. http://dx.doi.org/10.1145/1978942.1978970

When working at a large wall display, even if partially utilized, many targets are likely to be distant from the user, requiring walking, which is slow, and interrupts workflow. We propose a novel technique for selecting remote targets called Gesture Select, in which users draw an initial mark, in a target's direction; rectilinear gestures represented as icons are dynamically overlaid on targets within a region of interest; the user then continues by drawing the continuation mark corresponding to the target, to select it. Extensions to this technique to support working with remote content for an extended period, and learning gesture shortcuts are presented. A formal experiment indicates Gesture Select significantly outperformed direct selection for mid/far targets. Further analysis suggests Gesture Select performance is principally affected by the extent to which users can read the gestures, influenced by distance and perspective warping, and the gesture complexity in the ROI. The results of a second 2-D experiment with labeled targets indicate Gesture Select significantly outperformed direct selection and an existing technique.

© All rights reserved Bragdon and Ko and/or their publisher

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Zeleznik, Robert, Bragdon, Andrew, Adeputra, Ferdi and Ko, Hsu-Sheng (2010): Hands-on math: a page-based multi-touch and pen desktop for technical work and problem solving. In: Proceedings of the 2010 ACM Symposium on User Interface Software and Technology 2010. pp. 17-26. http://doi.acm.org/10.1145/1866029.1866035

Students, scientists and engineers have to choose between the flexible, free-form input of pencil and paper and the computational power of Computer Algebra Systems (CAS) when solving mathematical problems. Hands-On Math is a multi-touch and pen-based system which attempts to unify these approaches by providing virtual paper that is enhanced to recognize mathematical notations as a means of providing in situ access to CAS functionality. Pages can be created and organized on a large pannable desktop, and mathematical expressions can be computed, graphed and manipulated using a set of uni- and bi-manual interactions which facilitate rapid exploration by eliminating tedious and error prone transcription tasks. Analysis of a qualitative pilot evaluation indicates the potential of our approach and highlights usability issues with the novel techniques used.

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

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