Miguel A. Nacenta
Has also published under the name of:
"Miguel Nacenta"
Personal Homepage:
http://nacenta.comCurrent place of employment:
University of Calgary Miguel is a Ph.D. candidate at the Interaction Lab, University of Saskatchewan. His research is mostly focused on Multi-display Environments and Co-located collaboration.
Publications by Miguel A. Nacenta (bibliography)
» 2009 «
Pinelle, David, Barjawi, Mutasem, Nacenta, Miguel A. and Mandryk, Regan (2009): An evaluation of coordination techniques for protecting objects and territories in tabletop groupware. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 2129-2138. Available online
“Indirect input techniques allow users to quickly access all parts of tabletop workspaces without the need for physical access; however, indirect techniques restrict the available social cues that are seen on direct touch tables. This reduced awareness results in impoverished coordination; for example, the number of conflicts might increase since users are more likely to interact with objects that another person is planning to use. Conflicts may also arise because indirect techniques reduce territorial behavior, expanding the interaction space of each collaborator. In this paper, we introduce three new tabletop coordination techniques designed to reduce conflicts arising from indirect input, while still allowing users the flexibility of distant object control. Two techniques were designed to promote territoriality and to allow users to protect objects when they work near their personal areas, and the third technique lets users set their protection levels dynamically. We present the results of an evaluation, which shows that people prefer techniques that automatically provide protection for personal territories, and that these techniques also increase territorial behavior.”
Copyrights may apply
Hancock, Mark S., Nacenta, Miguel A., Gutwin, Carl and Carpendale, Sheelagh (2009): The Effects of Changing Projection Geometry on the Interprestation of 3D Orientation on Tabletops. In: Proceedings of Interactive Tabletops and Surfaces Tabletop 2009, Banff, Canada. pp. 175-182. Available online
Marquardt, Nicolai, Nacenta, Miguel A., Young, James E., Carpendale, Sheelagh, Greenberg, Saul and Sharlin, Ehud (2009): The Haptic Tabletop Puck: Tactile Feedback for Interactive Tabletops. In: Proceedings of Interactive Tabletops and Surfaces, Tabletop 2009, Banff, Canada. . Available online
Nacenta, Miguel A., Baudisch, Patrick, Benko, Hrvoje and Wilson, Andy (2009): Separability of Spatial Manipulations in Multi-touch Interfaces. In: Proceedings of Graphics Interface 2009, Kelowna, Canada. pp. 175-182. Available online
Pinelle, David, Barjawi, Mutasem, Nacenta, Miguel A. and Mandryk, Regan L. (2009): An Evaluation of Coordination Techniques for Protecting Objects and Territories in Tabletop Groupware. In: Proceedings of the ACM Conference on Human Factors in Computing Systems CHI 2009 2009, Boston, MA, USA. pp. 2129-2138. Available online
Nacenta, Miguel A., Gutwin, Carl, Aliakseyeu, Dima and Subramanian, Sriram (2009): There and Back again: Cross-Display Object Movement in Multi-Display Environments. In Human-Computer Interaction, 24 (1) pp. 170-229
» 2008 «
Nacenta, Miguel A., Mandryk, Regan L. and Gutwin, Carl (2008): Targeting across displayless space. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 777-786. Available online
“Multi-monitor displays and multi-display environments are now common. Cross-display cursor movement, in which a user moves the pointer from one display to another, occurs frequently in these settings. There are several techniques for supporting this kind of movement, and these differ in the way that they deal with displayless space (the physical space between displays). Stitching is the method used by most operating systems; in this technique, the cursor jumps from the edge of one display directly into the next display. In contrast, Mouse Ether maps the motor space of the mouse exactly to the physical space of the displays, meaning that the cursor has to travel across displayless space until it reaches the next display. To determine which of these approaches is best for cross-display movement, we carried out a study comparing Stitching, Mouse Ether, and a variant of Mouse Ether with Halo for off-screen feedback. We found that Stitching is equivalent to or faster than any variant of Mouse Ether, and that Halo improves Ether's performance (but not enough to outperform Stitching). Results also indicate that the larger the gap between displays, the longer the targeting takes -- even for Stitching. These findings provide valuable guidance for practitioners and raise new interesting questions for research.”
Copyrights may apply
Pinelle, David, Nacenta, Miguel A., Gutwin, Carl and Stach, Tadeusz (2008): The Effects of Co-Present Embodiments on Awareness and Collaboration in Tabletop Groupware. In: Proceedings of the 2008 Conference on Graphics Interface May 28-30, 2008, Windsor, Ontario, Canada. pp. 1-8.
“Most current tabletop groupware systems use direct touch, where people manipulate objects by touching them with a pen or a fingertip. The use of people's real arms and hands provides obvious awareness information, but workspace access is limited by the user's reach. Relative input techniques, where users manipulate a cursor rather than touching objects directly, allow users to reach all areas of the table. However, the only available awareness information comes from the virtual embodiment of the user (e.g., their cursor). This presents designers with a tradeoff: direct-touch techniques have advantages for group awareness; relative input techniques offer additional power but less awareness information. In this paper, we explore this tradeoff, and we explore the design space of virtual embodiments to determine whether factors such as size, realism, and visibility can improve awareness and coordination. We conducted a study in which seven groups carried out a picture-categorizing task using seven techniques: direct touch and relative input with six different virtual embodiments. Our results provide both valuable information to designers of tabletop groupware, and a number of new directions for future research.”
Copyrights may apply
Bateman, Scott, Gutwin, Carl and Nacenta, Miguel A. (2008): Seeing things in the clouds: the effect of visual features on tag cloud selections. In: Proceedings of the Nineteenth ACM Conference on Hypertext and Hypermedia 2008. pp. 193-202. Available online
“Tag clouds are a popular method for visualizing and linking socially-organized information on websites. Tag clouds represent variables of interest (such as popularity) in the visual appearance of the keywords themselves -- using text properties such as font size, weight, or colour. Although tag clouds are becoming common, there is still little information about which visual features of tags draw the attention of viewers. As tag clouds attempt to represent a wider range of variables with a wider range of visual properties, it becomes difficult to predict what will appear visually important to a viewer. To investigate this issue, we carried out an exploratory study that asked users to select tags from clouds that manipulated nine visual properties. Our results show that font size and font weight have stronger effects than intensity, number of characters, or tag area; but when several visual properties are manipulated at once, there is no one property that stands out above the others. This study adds to the understanding of how visual properties of text capture the attention of users, indicates general guidelines for designers of tag clouds, and provides a study paradigm and starting points for future studies. In addition, our findings may be applied more generally to the visual presentation of textual hyperlinks as a way to provide more information to web navigators.”
Copyrights may apply
Sakurai, Satoshi, Itoh, Yuichi, Kitamura, Yoshifumi, Nacenta, Miguel A., Yamaguchi, Tokuo, Subramanian, Sriram and Kishino, Fumio (2008): A Middleware for Seamless Use of Multiple Displays. In: Graham, T. C. Nicholas and Palanque, Philippe A. (eds.) DSV-IS 2008 - Interactive Systems. Design, Specification, and Verification, 15th International Workshop July 16-18, 2008, Kingston, Canada. pp. 252-266. Available online
Sakurai, Satoshi, Yamaguchi, Tokuo, Kitamura, Yoshifumi, Itoh, Yuichi, Fukazawa, Ryo, Kishino, Fumio, Nacenta, Miguel A. and Subramanian, Sriram (2008): M3: multi-modal interface in multi-display environment for multi-users. In: ACM SIGGRAPH ASIA artgallery emerging technologies 2008, Singapore. p. 45.
» 2007 «
Nacenta, Miguel A., Pinelle, David, Stuckel, Dane and Gutwin, Carl (2007): The effects of interaction technique on coordination in tabletop groupware. In: Proceedings of the 2007 Conference on Graphics Interface 2007. pp. 191-198. Available online
“The interaction techniques that are used in tabletop groupware systems (such as pick-and-drop or pantograph) can affect the way that people collaborate. However, little is known about these effects, making it difficult for designers to choose appropriate techniques when building tabletop groupware. We carried out an exploratory study to determine how several different types of interaction techniques (pantograph, telepointers, radar views, drag-and-drop, and laser beam) affected coordination and awareness in two tabletop tasks (a game and a storyboarding activity). We found that the choice of interaction technique significantly affected coordination measures, performance measures, and preference -- but that the effects were different for the two different tasks. Our study shows that the choice of tabletop interaction technique does indeed matter, and provides insight into how tabletop systems can better support group work.”
Copyrights may apply
Nacenta, Miguel A., Sakurai, Satoshi, Yamaguchi, Tokuo, Miki, Yohei, Itoh, Yuichi, Kitamura, Yoshifumi, Subramanian, Sriram and Gutwin, Carl (2007): E-conic: a perspective-aware interface for multi-display environments. In: Proceedings of the ACM Symposium on User Interface Software and Technology October 7-10, 2007, Newport, Rhode Island, USA. pp. 279-288. Available online
“Multi-display environments compose displays that can be at different locations from and different angles to the user; as a result, it can become very difficult to manage windows, read text, and manipulate objects. We investigate the idea of perspective as a way to solve these problems in multi-display environments. We first identify basic display and control factors that are affected by perspective, such as visibility, fracture, and sharing. We then present the design and implementation of E-conic, a multi-display multi-user environment that uses location data about displays and users to dynamically correct perspective. We carried out a controlled experiment to test the benefits of perspective correction in basic interaction tasks like targeting, steering, aligning, pattern-matching and reading. Our results show that perspective correction significantly and substantially improves user performance in all these tasks.”
Copyrights may apply
» 2006 «
Nacenta, Miguel A., Sallam, Samer, Champoux, Bernard, Subramanian, Sriram and Gutwin, Carl (2006): Perspective cursor: perspective-based interaction for multi-display environments. In: Proceedings of ACM CHI 2006 Conference on Human Factors in Computing Systems 2006. pp. 289-298. Available online
“Multi-display environments and smart meeting rooms are now becoming more common. These environments build a shared display space from variety of devices: tablets, projected surfaces, tabletops, and traditional monitors. Since the different display surfaces are usually not organized in a single plane, traditional schemes for stitching the displays together can cause problems for interaction. However, there is a more natural way to compose display space -- using perspective. In this paper, we develop interaction techniques for multi-display environments that are based on the user's perspective on the room. We designed the Perspective Cursor, a mapping of cursor to display space that appears natural and logical from wherever the user is located. We conducted an experiment to compare two perspective-based techniques, the Perspective Cursor and a beam-based technique, with traditional stitched displays. We found that both perspective techniques were significantly faster for targeting tasks than the traditional technique, and that Perspective Cursor was the most preferred method. Our results show that integrating perspective into the design of multi-display environments can substantially improve performance.”
Copyrights may apply
Reetz, Adrian, Gutwin, Carl, Stach, Tadeusz, Nacenta, Miguel A. and Subramanian, Sriram (2006): Superflick: a natural and efficient technique for long-distance object placement on digital tables. In: Proceedings of the 2006 Conference on Graphics Interface 2006. pp. 163-170. Available online
“Moving objects past arms' reach is a common action in both real-world and digital tabletops. In the real world, the most common way to accomplish this task is by throwing or sliding the object across the table. Sliding is natural, easy to do, and fast: however, in digital tabletops, few existing techniques for long-distance movement bear any resemblance to these real-world motions. We have designed and evaluated two tabletop interaction techniques that closely mimic the action of sliding an object across the table. Flick is an open-loop technique that is extremely fast. Superflick is based on Flick, but adds a correction step to improve accuracy for small targets. We carried out two user studies to compare these techniques to a fast and accurate proxy-based technique, the radar view. In the first study, we found that Flick is significantly faster than the radar for large targets, but is inaccurate for small targets. In the second study, we found no differences between Superflick and radar for either time or accuracy. Given the simplicity and learnability of flicking, our results suggest that throwing-based techniques have promise for improving the usability of digital tables.”
Copyrights may apply
Aliakseyeu, Dzmitry, Nacenta, Miguel A., Subramanian, Sriram and Gutwin, Carl (2006): Bubble radar: efficient pen-based interaction. In: Celentano, Augusto (ed.) AVI 2006 - Proceedings of the working conference on Advanced visual interfaces May 23-26, 2006, Venezia, Italy. pp. 19-26. Available online
» 2005 «
Nacenta, Miguel A., Aliakseyeu, Dzmitry, Subramanian, Sriram and Gutwin, Carl (2005): A comparison of techniques for multi-display reaching. In: Proceedings of ACM CHI 2005 Conference on Human Factors in Computing Systems 2005. pp. 371-380. Available online
“Recent advances in multi-user collaboration have seen a proliferation of interaction techniques for moving digital objects from one device to another. However, little is known about how these techniques work in realistic situations, or how they compare to one another. We conducted a study to compare the efficiency of six techniques for moving objects from a tablet to a tabletop display. We compared the techniques in four different distance ranges and with three movement directions. We found that techniques like the Radar View and Pick-and-Drop, that have a control-to-display ratio of 1, are significantly faster for object movement than techniques that have smaller control-to-display ratios. We also found that using spatial manipulation of objects was faster than pressure-based manipulation.”
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Mar 19th, 2010
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