Seongkook Heo

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Force gestures are touch screen gestures augmented by the normal and tangential forces on the screen. In order to study the feasibility of the force gestures on a mobile touch screen, we implemented a prototype touch screen device that can sense the normal and tangential forces of a touch gesture on the screen. We also designed two example applications, a(More)
We introduce an interaction technique that increases the touch screen input vocabulary by distinguishing a strong tap from a gentle tap without the use of additional hardware. We have designed and validated an algorithm that detects different types of screen touches by combining data from the built-in accelerometer with position data from the touch screen.(More)
Similar sliding gestures may have different meanings when they are performed with changing intensity. Touch screens, however, fail to properly distinguish those intensities due to their inability to sense variable pressures. Enabled by distinguishing normal and tangential forces, we explore new possibilities for gestures on a touch screen. We have(More)
Text entry on a smartwatch is a challenging problem due to the device's limited screen area. In this paper, we introduce the SplitBoard, which is a soft keyboard designed for a smartwatch. As the user flicks left or right on the keyboard, it switches between the left and right halves of a QWERTY keyboard. We report the results of two user experiments where(More)
We explored the use of a hover tracking touchpad in a laptop environment. In order to study the new experience, we implemented a prototype touchpad consisting of infrared LEDs and photo-transistors, which can track fingers as far as 10mm over the surface. We demonstrate here three major interaction techniques that would become possible when a hover-tracking(More)
As a way to enrich touch screen interaction, the possibility of using shear forces is being explored recently. However, most of the studies are restricted to the case of single-point shear forces possibly due to the difficulty of sensing shear forces at multiple touch points independently. In this video, we introduce a novel method to indirectly estimate(More)
In recent years, touch screens have emerged and matured as the main input interface for mobile and tablet computers calling for extended touch input possibilities. In this paper, we explore the use of consecutive distant taps to expand the touch screen input vocabulary. We analyzed time intervals and distances between consecutive taps during common(More)
In this paper, we explore the possibility of a long touchpad that utilizes the entire area below the keyboard of a laptop computer. An essential prerequisite for such a touchpad is a robust palm rejection method, which we satisfy using a proximity-sensing touchpad. We developed LongPad, a proximity-sensing optical touchpad that is as wide as a laptop(More)