Number of co-authors:17
Number of publications with 3 favourite co-authors:Yuanchun Shi:8Wenchang Xu:4Yongqiang Qin:3
Chun Yu's 3 most productive colleagues in number of publications:Ravin Balakrishnan:108Yuanchun Shi:30Paul Jen-Hwa Hu:19
It's really hard to design products by focus groups. A lot of times, people don't know what they want until you show it to them.
-- Steve Jobs, 1998
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Publications by Chun Yu (bibliography)
Liu, Jie, Yu, Chun, Xu, Wenchang and Shi, Yuanchun (2012): Clustering web pages to facilitate revisitation on mobile devices. In: Proceedings of the 2012 International Conference on Intelligent User Interfaces 2012. pp. 249-252.
Due to small screens, inaccuracy of input and other limitations of mobile devices, revisitation of Web pages in mobile browsers takes more time than that in desktop browsers. In this paper, we propose a novel approach to facilitate revisitation. We designed AutoWeb, a system that clusters opened Web pages into different topics based on their contents. Users can quickly find a desired opened Web page by narrowing down the searching scope to a group of Web pages that share the same topic. Clustering accuracy is evaluated to be 92.4% and computing resource consumption was proved to be acceptable. A user study was conducted to explore user experience and how much AutoWeb facilitates revisitation. Results showed that AutoWeb could save up a significant time for revisitation and participants rated the system highly.
© All rights reserved Liu et al. and/or ACM Press
Xu, Wenchang, Liu, Jie, Yu, Chun and Shi, Yuanchun (2012): Digging unintentional displacement for one-handed thumb use on touchscreen-based mobile devices. In: Proceedings of the 14th Conference on Human-computer interaction with mobile devices and services 2012. pp. 261-270.
There is usually an unaware screen distance between initial contact and final lift-off when users tap on touchscreen-based mobile devices with their fingers, which may affect users' target selection accuracy, gesture performance, etc. In this paper, we summarize such case as unintentional displacement and give its models under both static and dynamic scenarios. We then conducted two user studies to understand unintentional displacement for the widely-adopted one-handed thumb use on touchscreen-based mobile devices under both scenarios respectively. Our findings shed light on the following four questions: 1) what are the factors that affect unintentional displacement; 2) what is the distance range of the displacement; 3) how is the distance varying over time; 4) how are the unintentional points distributed around the initial contact point. These results not only explain certain touch inaccuracy, but also provide important reference for optimization and future design of UI components, gestures, input techniques, etc.
© All rights reserved Xu et al. and/or ACM Press
Xu, Wenchang, Yu, Chun and Shi, Yuanchun (2011): RegionalSliding: enhancing target selection on touchscreen-based mobile devices. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 1261-1266.
Target selection on mobile devices with touchscreens usually gets users into trouble due to the occlusion of the target by the user's finger and ambiguity about which part of the finger generates the result point. In this paper, we propose a novel technique to enhance target selection on touchscreen-based mobile devices, named RegionalSliding, which selectively renders the initially "selected" target as well as its "surrounding" targets in a non-occluded area when users press down on the screen and enables users to complete the selection with sliding gestures according to the visual feedback from the rendered area. A preliminary user study shows that RegionalSliding increases the selection accuracy and brings good user experience.
© All rights reserved Xu et al. and/or their publisher
Qin, Yongqiang, Yu, Chun, Liu, Jie, Wang, Yuntao, Shi, Yue, Su, Zhouyue and Shi, Yuanchun (2011): uTable: a seamlessly tiled, very large interactive tabletop system. In: Proceedings of the 2011 ACM International Conference on Interactive Tabletops and Surfaces 2011. pp. 244-245.
We present uTable, a very large horizontal interactive surface which accommodates up to ten people sitting around and interacting in parallel. We identify the key aspects for building such large interactive tabletops and discuss the pros and cons of potential techniques. After several rounds of trials, we finally chose tiled rear projection for building the very large surface and DI solution for detecting touch inputs. We also present a set of techniques to narrow the interior bezels, uniform the color/brightness of the surface and handle multiple streams of inputs. Finally uTable achieves a good overall performance in terms of display effect and input capability.
© All rights reserved Qin et al. and/or ACM Press
Zhong, Yu, Suo, Yue, Xu, Wenchang, Yu, Chun, Guo, Xinwei, Zhao, Yuhang and Shi, Yuanchun (2011): Smart home on smart phone. In: Proceedings of the 2011 International Conference on Uniquitous Computing 2011. pp. 467-468.
Mobile phone with high accessibility and usability is regarded as the ideal interface for the users to monitor and control the approaching smart home environment. Moreover, networking technologies and protocols have been advanced enough to support a universal monitoring and controlling interface on smart phones. This paper presents HouseGenie, an interactive, direct manipulation application on mobile, which supports a range of basic home monitoring and controlling functionalities as a replacement of individual remotes of smart home appliances. HouseGenie also addresses several common requirements that may be behind the vision, such as scenario, short-delay alarm, area restriction and so on. We demonstrate that HouseGenie not only provides intuitive presentations and interactions for smart home management, but also improves user experience comparing to present solutions.
© All rights reserved Zhong et al. and/or ACM Press
Yu, Chun, Tan, Xu, Shi, Yue and Shi, Yuanchun (2011): Air finger: enabling multi-scale navigation by finger height above the surface. In: Proceedings of the 2011 International Conference on Uniquitous Computing 2011. pp. 495-496.
We present Air Finger, a novel technique that enables controlling CD ratio by finger height above the touch sur-face for multi-scale navigation tasks. Extending previous research on virtual touch, Air Finger divides the space above surface into two layers and associates the high, medium and low CD ratios to the touch surface, the lower air and the higher air respectively. Users can fluidly switch between the three navigation scales by lifting and pressing the finger. Air Finger enables multi-scale navigation control using one hand.
© All rights reserved Yu et al. and/or ACM Press
Qin, Yongqiang, Shi, Yuanchun, Jiang, Hao and Yu, Chun (2010): Structured laser pointer: enabling wrist-rolling movements as a new interactive dimension. In: Proceedings of the 2010 International Conference on Advanced Visual Interfaces 2010. pp. 163-166.
In this paper, we re-visit the issue of multi-point laser pointer interaction from a wrist-rolling perspective. Firstly, we proposed SLP -- Structured Laser Pointer, and detects a laser pointer's rotation along its emitting axis. SLP adds the wrist-rolling gestures as a new interactive dimension to the conventional laser pointer interaction approach. We asked a group of users to perform certain tasks using SLP, and derived from test results a set of criteria to distinguish between incidental and intentional SLP rolling, and then the experimental results also approved the high accuracy and acceptable speed as well as throughput of such rolling interaction.
© All rights reserved Qin et al. and/or their publisher
Yu, Chun, Shi, Yuanchun, Balakrishnan, Ravin, Meng, Xiangliang, Suo, Yue, Fan, Mingming and Qin, Yongqiang (2010): The satellite cursor: achieving MAGIC pointing without gaze tracking using multiple cursors. In: Proceedings of the 2010 ACM Symposium on User Interface Software and Technology 2010. pp. 163-172.
We present the satellite cursor -- a novel technique that uses multiple cursors to improve pointing performance by reducing input movement. The satellite cursor associates every target with a separate cursor in its vicinity for pointing, which realizes the MAGIC (manual and gaze input cascade) pointing method without gaze tracking. We discuss the problem of visual clutter caused by multiple cursors and propose several designs to mitigate it. Two controlled experiments were conducted to evaluate satellite cursor performance in a simple reciprocal pointing task and a complex task with multiple targets of varying layout densities. Results show the satellite cursor can save significant mouse movement and consequently pointing time, especially for sparse target layouts, and that satellite cursor performance can be accurately modeled by Fitts' Law.
© All rights reserved Yu et al. and/or their publisher
Yu, Chun and Hu, Paul Jen-Hwa (2007): Examining the Impacts of Institutional Framework on E-Government Infrastructures: A Study of Hong Kong Experiences. In: HICSS 2007 - 40th Hawaii International International Conference on Systems Science 3-6 January, 2007, Waikoloa, Big Island, HI, USA. p. 93.
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