HCI~ Sarin Regmi

Reference Authors: Adam Marcus, Michael S. Bernstein, Osama Badar, David R. Karger, Samuel Madden, Robert C. Miller Affiliation: MIT CSAIL,32 Vassar St., Cambridge MA Presentation: CHI 2011, May 7–12, 2011, Vancouver, BC, Canada. Summary Hypothesis For people trying to understand events by querying services like Twitter, a chronological log of posts makes it very difficult to get a detailed understanding of an event.This paper presents TwitInfo, a system for visualizing and summarizing events on Twitter. Contents TwitInfo allows users to browse a large collection of tweets using a timeline-based display that highlights peaks of high tweet activity. A novel streaming algorithm automatically discovers these peaks and labels them meaningfully using text from the tweets. Users can drill down to subevents, and explore further via geolocation, sentiment, and popular URLs. They present an algorithm and an user interface as the TwitInfo system. An evaluation of the TwitInfo system revealed th...

Reference Authors and Affiliations Hao Lü, Computer Science and Engineering DUB Group, University of Washington Seattle, WA 98195 Yang Li, Google Research,1600 Amphitheatre Parkway Mountain View, CA 94043 Presentation: CHI 2011, May 7–12, 2011, Vancouver, BC, Canada. Summary Hypothesis The paper presents gesture avatar and hypothesizes the following about it performance. 1)Gesture Avatar will be slower than Shift on larger targets, but faster on small targets. 2) Gesture Avatar will have fewer errors than Shift. 3) Mobile situations such as walking will decrease the time performance and increase the error rate of Shift, but have little influence on Gesture Avatar. Contents The paper presents Gesture Avatar, a novel interaction technique that allows users to operate existing arbitrary user interfaces using gestures. It is hypothesized to leverage the visibility of graphical user interfaces and the casual interaction of gestures. Due to the low precision of finger input, small u...

Reference Authors and Affiliations: Jaime Ruiz,University of Waterloo Waterloo, ON, Canada Yang Li,Google Research Mountain View, CA, USA Edward Lank,University of Waterloo Waterloo, ON, Canada Presentation:CHI 2011, May 7–12, 2011, Vancouver, BC, Canada. Summary Hypothesis The paper presents the results of a guessability study that elicits end-user motion gestures to invoke commands on a smartphone device.They demonstrate that consensus exists on parameters of movement and on mappings of motion gestures onto commands.It is used to develop a taxonomy for motion gestures and to specify an end-user inspired motion gesture set. Methods The authors elicited input from 20 participants asking them to design and perform a motion gesture with a smartphone device (a cause) that could be used to execute a task on the smartphone (an effect). Nineteen tasks were presented to the participants during the study . Participants used the think- aloud protocol and supplied subjective preference ratings f...

Reference Authors : Mathieu Nancel, Julie Wagner, Emmanuel Pietriga, Olivier Chapuis, Wendy Mackay Affiliations: LRI - Univ Paris-Sud & CNRS,INRIA ,F-91405 Orsay, France Presentation: CHI 2011, May 7–12, 2011, Vancouver, BC, Canada Summary Contents As complex tasks such as pan-zoom navigation have received little attention on large sized high resolution display,building upon empirical data gathered from studies of pan-and-zoom on desktop computers and studies of remote pointing, the paper identifies three key factors for the design of mid-air pan-and-zoom techniques;uni- vs. bi- manual interaction, linear vs. circular movements, and level of guidance to accomplish the gestures in mid-air. 32 LCDs each 30 inch diagonal were used to create the display and the software was ZVTM toolkit run on Mac OS X. Hypothesis The paper presents the following seven hypotheses Two- handed gestures will be faster than one-handed gestures because panning and zooming are complementary actions, integra...

Reference Authors: Rebecca Fiebrink,Perry R. Cook( Department of Computer Science and Department of Music) and Daniel Trueman , Department of Music, Princeton University,Princeton, New Jersey, USA Presentation: CHI 2011, May 7–12, 2011, Vancouver, BC, Canada. Summary Hypothesis The paper presents study of the evaluation practices of end users interactively building supervised learning systems for real-world gesture analysis problems. The authors examine users’ model evaluation criteria, which spans over conventionally relevant criteria such as accuracy and cost, as well as novel criteria such as unexpectedness. Contents The researchers develop and test a software tool, called the Wekinator, that implements basic elements of supervised learning in a machine learning environment to recognize physical gestures and label them as a certain input. This application is particularly chosen because gesture modeling is one of the most common applications of machine learning and as well music nat...

Reference Authors and Affiliations: Leah Findlater,Jacob O. Wobbrock ,The Information School DUB Group University of Washington Seattle, WA 98195 USA Darren Gergle, School of Communication Northwestern University Evanston, IL 60208 USA James J. Higgins,Department of Statistics Kansas State University Manhattan, KS 66506 USA Presentation: CHI 2011, May 7–12, 2011, Vancouver, BC, Canada. Summary Hypothesis: The paper present the Aligned Rank Transform (ART) for nonparametric factorial data analysis in HCI. They propose a preprocessing step that “aligns” data before applying averaged ranks, after which point, common ANOVA procedures can be used, making the ART accessible to anyone familiar with the F-test. They hypothesize that researchers only familiar with ANOVA can use, interpret, and report results from the ART. Contents Conover and Iman’s Rank Transform (RT) uses the parametric F-test on the ranks, resulting in a nonparametric factorial procedu...

Reference Author: Jennifer A. Rode Affiliation: iSchool, Drexel University,3141 Chestnut St. Philadelphia PA, 19104 Presentation: CHI 2011, May 7–12, 2011, Vancouver, BC, Canada. Summary Hypothesis The paper overviews key aspects of use and contribution of digital anthropology in HCI, as well as in the anthropological approach. It relates these practices to participatory design and the socio-technical gap, and the ways ethnography can address them. Contents /Methods The paper illustrates how Anthropological Ethnographic’s reflexivity contributes to design and theory in HCI. First, It describes three forms of anthropological writing. Second, It explains key elements of those technique. Finally, It discusses where ethnography is used in the design process in CHI so that It can highlight how Digital (Anthropological) Ethnography can contribute. The paper discusses the following three methods of anthropology commonly used in HCI. Realist :The realist account strives for the authenticit...