Publication statistics

Pub. period:2003-2012
Pub. count:7
Number of co-authors:5


Number of publications with 3 favourite co-authors:

Mathieu Raynal:
Emmanuel Dubois:
Wendy E. Mackay:



Productive colleagues

Theophanis Tsandilas's 3 most productive colleagues in number of publications:

Wendy E. Mackay:61
M. C. Schraefel:28
Emmanuel Dubois:24

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Theophanis Tsandilas


Publications by Theophanis Tsandilas (bibliography)

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Tsandilas, Theophanis (2012): Interpreting strokes on paper with a mobile assistant. In: Proceedings of the 2012 ACM Symposium on User Interface Software and Technology 2012. pp. 299-308.

Digital pen technology has allowed for the easy transfer of pen data from paper to the computer. However, linking handwritten content with the digital world remains a hard problem as it requires the translation of unstructured and highly personal vocabularies into structured ones that computers can easily understand and process. Automatic recognition can help to this direction, but as it is not always reliable, solutions require the active cooperation between users and recognition algorithms. This work examines the use of portable touch-screen devices in connection with pen and paper to help users direct and refine the interpretation of their strokes on paper. We explore four techniques of bi-manual interaction that combine touch and pen-writing, where user attention is divided between the original strokes on paper and their interpretation by the electronic device. We demonstrate the techniques through a mobile interface for writing music that complements the automatic recognition with interactive user-driven interpretation. An experiment evaluates the four techniques and provides insights about their strengths and limitations.

© All rights reserved Tsandilas and/or ACM Press

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Tsandilas, Theophanis and Mackay, Wendy E. (2010): Knotty gestures: subtle traces to support interactive use of paper. In: Proceedings of the 2010 International Conference on Advanced Visual Interfaces 2010. pp. 147-154.

We introduce the knotty gesture, a simple yet powerful technique for interacting with paper. Knots are tiny circles that can be added to any gesture. Users can leave subtle marks that permit both immediate interaction in the flow of writing and create rich opportunities for future interaction. We identify diverse applications of knotty gestures and explore alternative techniques for interacting with their traces. We conducted two experiments to evaluate the design and recognition heuristics and demonstrated that people can successfully execute knotty gestures, even without feedback. Knotty gestures provide users with a subtle, in-the-flow-of-writing technique for tagging information and subsequently interacting with the paper.

© All rights reserved Tsandilas and Mackay and/or their publisher

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Tsandilas, Theophanis, Dubois, Emmanuel and Raynal, Mathieu (2010): Free-space pointing with constrained hand movements. In: Proceedings of ACM CHI 2010 Conference on Human Factors in Computing Systems 2010. pp. 3451-3456.

Research on pointing devices has shown that rate control is appropriate for isometric and elastic devices but not effective when input control is purely isotonic. Human hand has been generally considered as an isotonic device. Therefore, pointing devices that are directly controlled by hand movements (e.g., the mouse) are based on position rather than rate control. In this work, we study the relevance of rate control in low-resolution input. Taking into account elastic properties of the human wrist, this work explores designs that mix position and rate control when input is handled by constrained hand movements.

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

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Tsandilas, Theophanis, Letondal, Catherine and Mackay, Wendy E. (2009): Musink: composing music through augmented drawing. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 819-828.

We focus on the creative use of paper in the music composition process, particularly the interaction between paper and end-user programming. When expressing musical ideas, composers draw in a precise way, not just sketch. Working in close collaboration with composers, we designed Musink to provide them with a smooth transition between paper drawings and OpenMusic, a flexible music composition tool. Musink's built-in recognizers handle common needs, such as scoping and annotation. Users can also define new gestures and associate them with their own or predefined software functions. Musink supports semi-structured, delayed interpretation and serves as a customizable gesture browser, giving composers significant freedom to create their own, individualized composition languages and to experiment with music, on-paper and on-line.

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

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Tsandilas, Theophanis and Schraefel, M. C. (2007): Bubbling menus: a selective mechanism for accessing hierarchical drop-down menus. In: Proceedings of ACM CHI 2007 Conference on Human Factors in Computing Systems 2007. pp. 1195-1204.

This paper introduces bubbling menus, a new design for cascading drop-down menus. Bubbling menus combine the bubble cursor [10] with directional mouse-gesture techniques to facilitate the access of certain items in a menu, such as frequently selected items. Through an extensive iterative design process, we explore bubbling menus in the context of adaptive and customizable user interfaces. Unlike other adaptation and customization techniques such as split menus, bubbling menus do not disrupt the original structure of menus and enable the activation of menus far from a menu bar. Results from two evaluation studies presented in the paper show that bubbling menus provide an effective alternative to accelerate menu selections tasks.

© All rights reserved Tsandilas and Schraefel and/or ACM Press

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Tsandilas, Theophanis and Schraefel, M. C. (2005): An empirical assessment of adaptation techniques. In: Proceedings of ACM CHI 2005 Conference on Human Factors in Computing Systems 2005. pp. 2009-2012.

The effectiveness of adaptive user interfaces highly depends on the how accurately adaptation satisfies the needs of users. This paper presents an empirical study that examined two adaptation techniques applied on lists of textual selections. The study measured user performance controlling the accuracy of the suggestions made by the adaptive user interface. The results indicate that different adaptation techniques bare different costs and gains, which are affected by the accuracy of adaptation.

© All rights reserved Tsandilas and Schraefel and/or ACM Press

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Tsandilas, Theophanis and Schraefel, M. C. (2003): User-controlled link adaptation. In: Proceedings of the Fourteenth ACM Conference on Hypertext 2003. pp. 152-160.

This paper introduces an adaptable hypermedia approach applied to adaptive link annotation techniques. This approach suggests that the combination of direct manipulation with automated link annotation affords greater user control over page adaptation. In turn, this direct control better supports user focus in information discovery tasks. Unlike adaptive-only systems, our approach lets users both define multiple topics of interest and then manipulate how these topics' associated links are presented in a page. We discuss how the approach can be applied both to pages viewed as well as to the user's history list, thereby relieving users from the task of either adding to or organizing bookmarks. We describe the prototype developed to support these manipulations, as well as the adaptive architecture developed to support these controls.

© All rights reserved Tsandilas and Schraefel and/or ACM Press

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