Browsing by Author "Chung, Yi-Ju"

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"I Think It's Her": Investigating Smartphone Users' Speculation about Phone Notifications and Its Influence on Attendance
(2019-01-01)
Chang, Yung-Ju
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Chung, Yi-Ju
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Shih, Yi-Hao
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資訊工程學系
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Department of Computer Science
Smartphone users' decisions about whether to attend to a notification after sensing it are under-researched. We therefore studied 33 Android users, and found that they speculated extensively about notifications' sources-i.e., which apps and which senders were responsible for them- before attending to them. The participants' speculation about apps was both more common and more accurate than that about senders. They also were more likely to 1) perceive notifications as important, 2) attend to them, and 3) consider them beneficial if they speculated about them than if they did not or could not. Participants' speculations were based on the alert's inherent characteristics, context, and temporality. Inaccurate speculations were mainly caused by unclear signals, insufficient clues, and a multiplicity of possible sources. Ringer mode affected the accuracy of user speculation, but not its frequency or the frequency of attending to notifications.
Outside-In: Visualizing Out-of-Sight Regions-of-Interest in a 360 Video Using Spatial Picture-in-Picture Previews
(2017-01-01)
Lin, Yung-Ta
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Liao, Yi-Chi
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Teng, Shan-Yuan
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Chung, Yi-Ju
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Chan, Liwei
360-degree video contains a full field of environmental content. However, browsing these videos, either on screens or through head-mounted displays (HMDs), users consume only a subset of the full field of view per a natural viewing experience. This causes a search problem when a region-of-interest (ROI) in a video is outside of the current field of view (FOV) on the screen, or users may search for non-existing ROIs. We propose Outside-In, a visualization technique which reintroduces off-screen regions-of-interest (ROIs) into the main screen as spatial picture-in-picture (PIP) previews. The geometry of the preview windows further encodes a ROI's relative location vis-a-vis the main screen view, allowing for effective navigation. In an 18-participant study, we compare Outside-In with traditional arrow-based guidance within three types of 360-degree video. Results show that Outside-In outperforms in regard to understanding spatial relationship, the storyline of the content and overall preference. Two applications are demonstrated for use with Outside-In in 360-degree video navigation with touchscreens, and live telepresence.
What Do Smartphone Users Do when They Sense Phone Notifications?
(2017-01-01)
Chang, Yung-Ju
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Chung, Yi-Ju
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Shih, Yi-Hao
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Chang, Hsiu-Chi
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Lin, Tzu-Hao
Smartphone users receive a variety of notifications on their phone every day. To understand how smartphone users deal with notifications, recent mobile receptivity research has started studying notification management and attendance behavior. However, what do smartphone users do when they sense a notification, such as hearing the sound or feeling the vibration before they spot it? We present a study investigating smartphone users' behavior starting from the moment when they sense a notification, including speculating the source and deciding whether and when to look at it, until they attend to it. We explore how users' behaviors vary according to the situation, what factors affect the behaviors, and in what situations users need particular help from a notification system to be better aware of and to accurately judge the source of a notification. We expect the findings will provide useful implications for the design of future notification alert system.