David Ahlström

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Selecting a menu item in a cascading pull-down menu is a frequent but time consuming and complex GUI task. This paper describes an approach aimed to support the user during selection in cascading pull-down menus when using an indirect pointing device. By enhancing such a cascading pull-down menu with "force fields", the cursor is attracted toward a certain(More)
Smartphones are useful personal assistants and omnipresent communication devices. However, collaboration is not among their strengths. With the advent of embedded projectors this might change. We conducted a study with 56 participants to find out if map navigation and spatial memory performance among users and observers can be improved by using a projector(More)
In this paper we explore the usage of "force fields" in order to facilitate the computer user during pointing tasks. The first study shows that pointing time can be reduced by enhancing a pointing target with an invisible force field that warps the screen cursor toward the target center. The application of force fields is further supported in that we show(More)
Touch-based interaction with computing devices is becoming more and more common. In order to design for this setting, it is critical to understand the basic human factors of touch interactions such as tapping and dragging; however, there is relatively little empirical research in this area, particularly for touch-based dragging. To provide foundational(More)
The Video Browser Showdown evaluates the performance of exploratory video search tools on a common data set in a common environment and in presence of the audience. The main goal of this competition is to enable researchers in the field of interactive video search to directly compare their tools at work. In this paper, we present results from the second(More)
We consider different hierarchical menu and toolbar-like interface designs from a theoretical perspective and show how a model based on visual search time, pointing time, decision time and expertise development can assist in understanding and predicting interaction performance. Three hierarchical menus designs are modelled -- a traditional pull-down menu, a(More)
Peephole pointing is a promising interaction technique for large workspaces that contain more information than can be appropriately displayed on a single screen. In peephole pointing a window to the virtual workspace is moved in space to reveal additional content. In 2008, two different models for peephole pointing were discussed. Cao, Li and Balakrishnan(More)
We want to make a window switching interface where the most popular items are bigger, because big things are easier to hit. * SCOTZ means Spatially COnsistent Thumbnail Zones * It supports rapid switching to applications (by zones) and windows (by thumbnails) * It is shown full screen when you press a special function key * Repetitiveness: The more you use(More)
Default image browsing interfaces on touch-based mobile devices provide limited support for image search tasks. To facilitate fast and convenient searches we propose an alternative interface that takes advantage of 3D graphics and arranges images on a rotatable globe according to color similarity. In a user study we compare the new design to the iPad's(More)