Publication statistics

Pub. period:2011-2011
Pub. count:5
Number of co-authors:10


Number of publications with 3 favourite co-authors:

Won-Chul Bang:
DoKyoon Kim:
Changyeong Kim:



Productive colleagues

Seongkook Heo's 3 most productive colleagues in number of publications:

Geehyuk Lee:23
Seunghwan Lee:5
Jaehyun Han:4

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Seongkook Heo


Publications by Seongkook Heo (bibliography)

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Heo, Seongkook and Lee, Geehyuk (2011): Force gestures: augmented touch screen gestures using normal and tangential force. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 1909-1914. Available online

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 implemented a pressure-sensitive prototype and have designed a set of gestures that utilize alterable forces. The gestures' feasibility has been tested through a simple experiment. Finally, we discuss the new possibility of touch interactions that are sensitive to pressure.

© All rights reserved Heo and Lee and/or their publisher

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Heo, Seongkook and Lee, Geehyuk (2011): ForceTap: extending the input vocabulary of mobile touch screens by adding tap gestures. In: Proceedings of 13th Conference on Human-computer interaction with mobile devices and services 2011. pp. 113-122. Available online

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. The proposed technique allows a touch screen input to contain not only the position of a finger contact, but also its type, i.e., whether the contact is a 'Tap' or a 'ForceTap.' To verify the feasibility of the proposed technique we have implemented our detection algorithm in experiments that test cases of single-handed, two-handed, immersive, and on the move usage. Based on the experimental results, we investigate the advantages of using two types of touch inputs and discuss emerging issues. Finally, we suggest a design guideline for applying the proposed technique to touch screen applications, and present possible application scenarios.

© All rights reserved Heo and Lee and/or ACM Press

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Heo, Seongkook, Han, Jaehyun, Choi, Sangwon, Lee, Seunghwan, Lee, Geehyuk, Lee, Hyong-Euk, Kim, SangHyun, Bang, Won-Chul, Kim, DoKyoon and Kim, Changyeong (2011): IrCube tracker: an optical 6-DOF tracker based on LED directivity. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 577-586. Available online

Six-degrees-of-freedom (6-DOF) trackers, which were mainly for professional computer applications, are now in demand by everyday consumer applications. With the requirements of consumer electronics in mind, we designed an optical 6-DOF tracker where a few photo-sensors can track the position and orientation of an LED cluster. The operating principle of the tracker is basically source localization by solving an inverse problem. We implemented a prototype system for a TV viewing environment, verified the feasibility of the operating principle, and evaluated the basic performance of the prototype system in terms of accuracy and speed. We also examined its application possibility to different environments, such as a tabletop computer, a tablet computer, and a mobile spatial interaction environment.

© All rights reserved Heo et al. and/or ACM Press

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Heo, Seongkook and Lee, Geehyuk (2011): Force gestures: augmenting touch screen gestures with normal and tangential forces. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 621-626. Available online

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 web browser and an e-book reader, that utilize the force gestures for their primary actions. We conducted a user study with the prototype and the applications to study the characteristics of the force gestures and the effectiveness of their mapping to the primary actions. In the user study we could also discover interesting usability issues and collect useful user feedback about the force gestures and their mapping to GUI actions.

© All rights reserved Heo and Lee and/or ACM Press

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Choi, Sangwon, Han, Jaehyun, Kim, Sunjun, Heo, Seongkook and Lee, Geehyuk (2011): ThickPad: a hover-tracking touchpad for a laptop. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 15-16. Available online

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 touchpad meets a laptop.

© All rights reserved Choi et al. and/or ACM Press

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