Amy K. Karlson
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Publications by Amy K. Karlson (bibliography)
» 2009 «
Karlson, Amy K., Brush, A. J. Bernheim and Schechter, Stuart (2009): Can i borrow your phone?: understanding concerns when sharing mobile phones. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 1647-1650. Available online
“Mobile phones are becoming increasingly personalized in terms of the data they store and the types of services they provide. At the same time, field studies have reported that there are a variety of situations in which it is natural for people to share their phones with others. However, most mobile phones support a binary security model that offers all-or-nothing access to the phone. We interviewed 12 smartphone users to explore how security and data privacy concerns affected their willingness to share their mobile phones. The diversity of guest user categorizations and associated security constraints expressed by the participants suggests the need for a security model richer than today's binary model.”
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» 2008 «
Karlson, Amy K. and Bederson, Benjamin B. (2008): One-handed touchscreen input for legacy applications. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 1399-1408. Available online
“Supporting one-handed thumb operation of touchscreen-based mobile devices presents a challenging tradeoff between visual expressivity and ease of interaction. ThumbSpace and Shift -- two new application-independent, software-based interaction techniques -- address this tradeoff in significantly different ways. ThumbSpace addresses distant objects while Shift addresses small object occlusion. We present two extensive, comparative user studies. The first compares ThumbSpace and Shift to peripheral hardware (directional pad and scrollwheel) and direct touchscreen input for selecting objects while standing and walking. The data favored the Shift design overall, but suggested ThumbSpace is promising for distant objects. Our second study examines the benefits and learnability of combining Shift and ThumbSpace on a device with a larger screen (3.5"). We found their combined use offered users better overall speed and accuracy in hitting small targets (3.6 mm{sup:2}) than using either method alone.”
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» 2007 «
Karlson, Amy K. and Bederson, Benjamin B. (2007): ThumbSpace: Generalized One-Handed Input for Touchscreen-Based Mobile Devices. In: Baranauskas, Maria Cecília Calani, Palanque, Philippe A., Abascal, Julio and Barbosa, Simone Diniz Junqueira (eds.) DEGAS 2007 - Proceedings of the 1st International Workshop on Design and Evaluation of e-Government Applications and Services September 11th, 2007, Rio de Janeiro, Brazil. pp. 324-338. Available online
» 2006 «
Karlson, Amy K., Robertson, George G., Robbins, Daniel C., Czerwinski, Mary and Smith, Greg R. (2006): FaThumb: a facet-based interface for mobile search. In: Proceedings of ACM CHI 2006 Conference on Human Factors in Computing Systems 2006. pp. 711-720. Available online
“In this paper we describe a novel approach for searching large data sets from a mobile phone. Existing interfaces for mobile search require keyword text entry and are not suited for browsing. Our alternative uses a hybrid model to de-emphasize tedious keyword entry in favor of iterative data filtering. We propose navigation and selection of hierarchical metadata (facet navigation), with incremental text entry to further narrow the results. We conducted a formative evaluation to understand the relative advantages of keyword entry versus facet navigation for both browse and search tasks on the phone. We found keyword entry to be more powerful when the name of the search target is known, while facet navigation is otherwise more effective and strongly preferred.”
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Parhi, Pekka, Karlson, Amy K. and Bederson, Benjamin B. (2006): Target size study for one-handed thumb use on small touchscreen devices. In: Proceedings of 8th conference on Human-computer interaction with mobile devices and services 2006. pp. 203-210. Available online
“This paper describes a two-phase study conducted to determine optimal target sizes for one-handed thumb use of mobile handheld devices equipped with a touch-sensitive screen. Similar studies have provided recommendations for target sizes when using a mobile device with two hands plus a stylus, and interacting with a desktop-sized display with an index finger, but never for thumbs when holding a small device in a single hand. The first phase explored the required target size for single-target (discrete) pointing tasks, such as activating buttons, radio buttons or checkboxes. The second phase investigated optimal sizes for widgets used for tasks that involve a sequence of taps (serial), such as text entry. Since holding a device in one hand constrains thumb movement, we varied target positions to determine if performance depended on screen location. The results showed that while speed generally improved as targets grew, there were no significant differences in error rate between target sizes =9.6 mm in discrete tasks and targets =7.7 mm in serial tasks. Along with subjective ratings and the findings on hit response variability, we found that target size of 9.2 mm for discrete tasks and targets of 9.6 mm for serial tasks should be sufficiently large for one-handed thumb use on touchscreen-based handhelds without degrading performance and preference.”
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Parhi, Pekka, Karlson, Amy K. and Bederson, Benjamin B. (2006): Target size study for one-handed thumb use on small touchscreen devices. In: Nieminen, Marko and Röykkee, Mika (eds.) Proceedings of the 8th Conference on Human-Computer Interaction with Mobile Devices and Services - Mobile HCI 2006 September 12-15, 2006, Helsinki, Finland. pp. 203-210. Available online
» 2005 «
Karlson, Amy K., Bederson, Benjamin B. and SanGiovanni, John (2005): AppLens and launchTile: two designs for one-handed thumb use on small devices. In: Proceedings of ACM CHI 2005 Conference on Human Factors in Computing Systems 2005. pp. 201-210. Available online
“We present two interfaces to support one-handed thumb use for PDAs and cell phones. Both use Scalable User Interface (ScUI) techniques to support multiple devices with different resolutions and aspect ratios. The designs use variations of zooming interface techniques to provide multiple views of application data: AppLens uses tabular fisheye to access nine applications, while LaunchTile uses pure zoom to access thirty-six applications. We introduce two sets of thumb gestures, each representing different philosophies for one-handed interaction. We conducted two studies to evaluate our designs. In the first study, we explored whether users could learn and execute the AppLens gesture set with minimal training. Participants performed more accurately and efficiently using gestures for directional navigation than using gestures for object interaction. In the second study, we gathered user reactions to each interface, as well as comparative preferences. With minimal exposure to each design, most users favored AppLens's tabular fisheye interface.”
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Mar 18th, 2010
Changes to this page (author)
15 Feb 2010: Enabled abstracts to be shown on Amy K. Karlson's author page.25 Jul 2009: Author was edited 29 May 2009: Author was edited
09 May 2009: Author was edited
12 May 2008: Author was edited
24 Jul 2007: Author was edited
29 Jun 2007: Author was edited
19 Jun 2007: Author was added to the bibliography
