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Query: Cherek_C* ⇒ Results: 4 Sorted by: Date  Comments?
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Chronicler: Interactive Exploration of Source Code History End-User Programming / Wittenhagen, Moritz / Cherek, Christian / Borchers, Jan Proceedings of the ACM CHI'16 Conference on Human Factors in Computing Systems 2016-05-07 v.1 p.3522-3532
© Copyright 2016 ACM
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Summary: Exploring source code history is an important task for software maintenance. Traditionally, source code history is navigated on the granularity of individual files. This is not fine-grained enough to support users in exploring the evolution of individual code elements. We suggest to consider the history of individual elements within the tree structure inherent to source code. A history graph created from these trees then enables new ways to explore events of interest defined by structural changes in the source code. We present Tree Flow, a visualization of these structural changes designed to enable users to choose the appropriate level of detail for the task at hand. In a user study, we show that both Chronicler and the history aware timeline, two prototype systems combining history graph navigation with a traditional source code view, outperform the more traditional history navigation on a file basis and users strongly prefer Chronicler for the exploration of source code.
PERCs Demo: Persistently Trackable Tangibles on Capacitive Multi-Touch Displays Demos / Cherek, Christian / Voelker, Simon / Thar, Jan / Linden, Rene / Busch, Florian / Borchers, Jan Proceedings of the 2015 ACM International Conference on Interactive Tabletops and Surfaces 2015-11-15 p.389-392
© Copyright 2015 ACM
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Summary: Tangible objects on capacitive multi-touch surfaces are usually only detected while the user is touching them. When the user lets go of such a tangible, the system cannot distinguish whether the user just released the tangible, or picked it up and removed it from the surface. In this demo we demonstrate PERCs, persistent capacitive tangibles that "know" whether they are currently on a capacitive touch surface or not. This is achieved by adding a small field sensor to the tangible to detect the touch screen's own, weak electromagnetic touch detection probing signal. In this demo we present two applications that make use of PERC tangibles -- An air hockey like game for two players and a single person arcade game.
PERCs: Persistently Trackable Tangibles on Capacitive Multi-Touch Displays Session 5B: Tangibles / Voelker, Simon / Cherek, Christian / Thar, Jan / Karrer, Thorsten / Thoresen, Christian / Øvergård, Kjell Ivar / Borchers, Jan Proceedings of the 2015 ACM Symposium on User Interface Software and Technology 2015-11-05 v.1 p.351-356
© Copyright 2015 ACM
ACM Digital Library Link
Summary: Tangible objects on capacitive multi-touch surfaces are usually only detected while the user is touching them. When the user lets go of such a tangible, the system cannot distinguish whether the user just released the tangible, or picked it up and removed it from the surface. We introduce PERCs, persistent capacitive tangibles that "know" whether they are currently on a capacitive touch surface or not. This is achieved by adding a small field sensor to the tangible to detect the touch screen's own, weak electromagnetic touch detection probing signal. Thus, unlike previous designs, PERCs do not get filtered out over time by the adaptive signal filters of the touch screen. We provide a technical overview of the theory behind PERCs and our prototype construction, and we evaluate detection rates, timing performance, and positional and angular accuracy for PERCs on a variety of unmodified, commercially available multi-touch devices. Through their affordable circuitry and high accuracy, PERCs open up the potential for a variety of new applications that use tangibles on today's ubiquitous multi-touch devices.
HaptiCase: Back-of-Device Tactile Landmarks for Eyes-Free Absolute Indirect Touch Tangible Interaction with Phones / Corsten, Christian / Cherek, Christian / Karrer, Thorsten / Borchers, Jan Proceedings of the ACM CHI'15 Conference on Human Factors in Computing Systems 2015-04-18 v.1 p.2171-2180
© Copyright 2015 ACM
ACM Digital Library Link
Summary: Using a smartphone for touch input to control apps and games mirrored to a distant screen is difficult, as the user cannot see where she is touching while looking at the distant display. We present HaptiCase, an interaction technique that provides back-of-device tactile landmarks that the user senses with her fingers to estimate the location of her finger in relation to the touchscreen. By pinching the thumb resting above the touch-screen to a finger at the back, the finger position is transferred to the front as the thumb touches the screen. In a study, we compared touch performance of different landmark layouts with a regular landmark-free mobile device. Using a landmark design of dots on a 3x5 grid significantly improves eyes-free tapping accuracy and allows targets to be as small as 17.5 mm -- a 14% reduction in target size -- to cover 99% of all touches. When users can look at the touchscreen, landmarks have no significant effect on performance. HaptiCase is low-cost, requires no electronics, and works with unmodified software.