Gonzalo Ramos
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Publications by Gonzalo Ramos (bibliography)
» 2009 «
Teevan, Jaime, Cutrell, Edward, Fisher, Danyel, Drucker, Steven M., Ramos, Gonzalo, André, Paul and Hu, Chang (2009): Visual snippets: summarizing web pages for search and revisitation. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 2023-2032. Available online
“People regularly interact with different representations of Web pages. A person looking for new information may initially find a Web page represented as a short snippet rendered by a search engine. When he wants to return to the same page the next day, the page may instead be represented by a link in his browser history. Previous research has explored how to best represent Web pages in support of specific task types, but, as we find in this paper, consistency in representation across tasks is also important. We explore how different representations are used in a variety of contexts and present a compact representation that supports both the identification of new, relevant Web pages and the re-finding of previously viewed pages.”
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» 2008 «
Dragicevic, Pierre, Ramos, Gonzalo, Bibliowitcz, Jacobo, Nowrouzezahrai, Derek, Balakrishnan, Ravin and Singh, Karan (2008): Video browsing by direct manipulation. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 237-246. Available online
“We present a method for browsing videos by directly dragging their content. This method brings the benefits of direct manipulation to an activity typically mediated by widgets. We support this new type of interactivity by: 1) automatically extracting motion data from videos; and 2) a new technique called relative flow dragging that lets users control video playback by moving objects of interest along their visual trajectory. We show that this method can outperform the traditional seeker bar in video browsing tasks that focus on visual content rather than time.”
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Birnholtz, Jeremy P., Gutwin, Carl, Ramos, Gonzalo and Watson, Mark (2008): OpenMessenger: gradual initiation of interaction for distributed workgroups. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 1661-1664. Available online
“The initiation of interaction in face-to-face environments is a gradual process, and takes place in a rich information landscape of awareness, attention, and social signals. One of the main benefits of this process is that people can be more sensitive to issues of privacy and interruption while they are moving towards interaction. However, on-line communication tools do not provide this subtlety, and often lead to unwanted interruptions. We have developed a prototype message system called OpenMessenger (OM) that adds the idea of gradual initiation of interaction to on-line communication. OpenMessenger provides multiple levels of awareness about people, and provides notification to those about whom information is being gathered. OpenMessenger allows people to negotiate interaction in a richer fashion than is possible with any other current messaging system. Preliminary evaluation data suggest the utility of the approach, but also shows that there are a number of issues yet to be resolved in this area.”
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Bi, Xiaojun, Moscovich, Tomer, Ramos, Gonzalo, Balakrishnan, Ravin and Hinckley, Ken (2008): An exploration of pen rolling for pen-based interaction. In: Cousins, Steve B. and Beaudouin-Lafon, Michel (eds.) Proceedings of the 21st Annual ACM Symposium on User Interface Software and Technology October 19-22, 2008, Monterey, CA, USA. pp. 191-200. Available online
» 2007 «
Ramos, Gonzalo, Cockburn, Andy, Balakrishnan, Ravin and Beaudouin-Lafon, Michel (2007): Pointing lenses: facilitating stylus input through visual-and motor-space magnification. In: Proceedings of ACM CHI 2007 Conference on Human Factors in Computing Systems 2007. pp. 757-766. Available online
“Using a stylus on a tablet computer to acquire small targets can be challenging. In this paper we present pointing lenses -- interaction techniques that help users acquire and select targets by presenting them with an enlarged visual and interaction area. We present and study three pointing lenses for pen-based systems and find that our proposed Pressure-Activated Lens is the top overall performer in terms of speed, accuracy and user preference. In addition, our experimental results not only show that participants find all pointing lenses beneficial for targets smaller than 5 pixels, but they also suggest that this benefit may extend to larger targets as well.”
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» 2006 «
Baudisch, Patrick, Tan, Desney S., Collomb, Maxime, Robbins, Dan, Hinckley, Ken, Agrawala, Maneesh, Zhao, Shengdong and Ramos, Gonzalo (2006): Phosphor: explaining transitions in the user interface using afterglow effects. In: Proceedings of the ACM Symposium on User Interface Software and Technology 2006. pp. 169-178. Available online
“Sometimes users fail to notice a change that just took place on their display. For example, the user may have accidentally deleted an icon or a remote collaborator may have changed settings in a control panel. Animated transitions can help, but they force users to wait for the animation to complete. This can be cumbersome, especially in situations where users did not need an explanation. We propose a different approach. Phosphor objects show the outcome of their transition instantly; at the same time they explain their change in retrospect. Manipulating a phosphor slider, for example, leaves an afterglow that illustrates how the knob moved. The parallelism of instant outcome and explanation supports both types of users. Users who already understood the transition can continue interacting without delay, while those who are inexperienced or may have been distracted can take time to view the effects at their own pace. We present a framework of transition designs for widgets, icons, and objects in drawing programs. We evaluate phosphor objects in two user studies and report significant performance benefits for phosphor objects.”
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Ramos, Gonzalo, Robertson, George G., Czerwinski, Mary, Tan, Desney S., Baudisch, Patrick, Hinckley, Ken and Agrawala, Maneesh (2006): Tumble! Splat! helping users access and manipulate occluded content in 2D drawings. In: Celentano, Augusto (ed.) AVI 2006 - Proceedings of the working conference on Advanced visual interfaces May 23-26, 2006, Venezia, Italy. pp. 428-435. Available online
» 2005 «
Ramos, Gonzalo and Balakrishnan, Ravin (2005): Zliding: fluid zooming and sliding for high precision parameter manipulation. In: Proceedings of the 2005 ACM Symposium on User Interface Software and Technology 2005. pp. 143-152. Available online
“High precision parameter manipulation tasks typically require adjustment of the scale of manipulation in addition to the parameter itself. This paper introduces the notion of Zoom Sliding, or Zliding, for fluid integrated manipulation of scale (zooming) via pressure input while parameter manipulation within that scale is achieved via x-y cursor movement (sliding). We also present the Zlider (Figure 1), a widget that instantiates the Zliding concept. We experimentally evaluate three different input techniques for use with the Zlider in conjunction with a stylus for x-y cursor positioning, in a high accuracy zoom and select task. Our results marginally favor the stylus with integrated isometric pressure sensing tip over bimanual techniques which separate zooming and sliding controls over the two hands. We discuss the implications of our results and present further designs that make use of Zliding.”
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Hinckley, Ken, Baudisch, Patrick, Ramos, Gonzalo and Guimbretiere, Francois (2005): Design and analysis of delimiters for selection-action pen gesture phrases in scriboli. In: Proceedings of ACM CHI 2005 Conference on Human Factors in Computing Systems 2005. pp. 451-460. Available online
“We present a quantitative analysis of delimiters for pen gestures. A delimiter is "something different" in the input stream that a computer can use to determine the structure of input phrases. We study four techniques for delimiting a selection-action gesture phrase consisting of lasso selection plus marking-menu-based command activation. Pigtail is a new technique that uses a small loop to delimit lasso selection from marking (Fig. 1). Handle adds a box to the end of the lasso, from which the user makes a second stroke for marking. Timeout uses dwelling with the pen to delimit the lasso from the mark. Button uses a button press to signal when to delimit the gesture. We describe the role of delimiters in our Scriboli pen interaction testbed, and show how Pigtail supports scope selection, command activation, and direct manipulation all in a single fluid pen gesture.”
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» 2004 «
Ramos, Gonzalo, Boulos, Matthew and Balakrishnan, Ravin (2004): Pressure widgets. In: Dykstra-Erickson, Elizabeth and Tscheligi, Manfred (eds.) Proceedings of ACM CHI 2004 Conference on Human Factors in Computing Systems April 24-29, 2004, Vienna, Austria. pp. 487-494. Available online
“Current user interface widgets typically assume that the input device can only provide x-y position and binary button press information. Other inputs such as the continuous pressure data provided by styluses on tablets are rarely used. We explore the design space of using the continuous pressure sensing capabilities of styluses to operate multi-state widgets. We present the results of a controlled experiment that investigates human ability to perform discrete target selection tasks by varying a stylus' pressure, with full or partial visual feedback. The experiment also considers different techniques for confirming selection once the target is acquired. Based on the experimental results, we discuss implications for the design of pressure sensitive widgets. A taxonomy of pressure widgets is presented, along with a set of initial concept sketches of various pressure widget designs.”
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Hinckley, Ken, Ramos, Gonzalo, Guimbretiere, Francois, Baudisch, Patrick and Smith, Marc (2004): Stitching: pen gestures that span multiple displays. In: Costabile, Maria Francesca (ed.) AVI 2004 - Proceedings of the working conference on Advanced visual interfaces May 25-28, 2004, Gallipoli, Italy. pp. 23-31. Available online
» 2003 «
Ramos, Gonzalo and Balakrishnan, Ravin (2003): Fluid interaction techniques for the control and annotation of digital video. In: Proceedings of the 16th annural ACM Symposium on User Interface Software and Technology November, 2-5, 2003, Vancouver, Canada. pp. 105-114. Available online
“We explore a variety of interaction and visualization techniques for fluid
navigation, segmentation, linking, and annotation of digital videos. These
techniques are developed within a concept prototype called LEAN that is
designed for use with pressure-sensitive digitizer tablets. These techniques
include a transient position+velocity widget that allows users not only to move
around a point of interest on a video, but also to rewind or fast forward at a
controlled variable speed. We also present a new variation of fish-eye views
called twist-lens, and incorporate this into a position control slider designed
for the effective navigation and viewing of large sequences of video frames. We
also explore a new style of widgets that exploit the use of the pen's
pressure-sensing capability, increasing the input vocabulary available to the
user. Finally, we elaborate on how annotations referring to objects that are
temporal in nature, such as video, may be thought of as links, and fluidly
constructed, visualized and navigated.”
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Mar 16th, 2010
Changes to this page (author)
15 Feb 2010: Enabled abstracts to be shown on Gonzalo Ramos's author page.12 Jul 2009: Author was edited 17 Jun 2009: Author was edited
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27 Sep 2007: Added a picture of Gonzalo Ramos
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28 Apr 2003: Added the author to the bibliography
