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Multiplexed Input to Protect Against Casual Observers
Andrea Bianchi,Ian Oakley 한국HCI학회 2014 한국HCI학회 학술대회 Vol.2014 No.12
It has become common to authenticate to private content on smartphones or tablets in the presence of trusted individuals such as friends and coworkers - casual, inadvertent and non-malicious observers to whom users do not want to needlessly expose their passwords. Existing shoulder-surfing resistant authentication schemes provide security but are overly burdensome for users in these relaxed scenarios. This paper explores the idea of using heterogeneous multiplexed input codes as a simple technique for creating good-enough solutions to protect against casual observation in non-malicious and relatively secure settings - trading off security for usability.
Design and evaluation of a head-mounted display for immersive 3D teleoperation of field robots
Martins, Henrique,Oakley, Ian,Ventura, Rodrigo Cambridge University Press 2015 Robotica Vol.33 No.10
<B>SUMMARY</B><P>This paper describes and evaluates the use of a head-mounted display (HMD) for the teleoperation of a field robot. The HMD presents a pair of video streams to the operator (one to each eye) originating from a pair of stereo cameras located on the front of the robot, thus providing him/her with a sense of depth (stereopsis). A tracker on the HMD captures 3-DOF head orientation data which is then used for adjusting the camera orientation by moving the robot and/or the camera position accordingly, and rotating the displayed images to compensate for the operator's head rotation. This approach was implemented in a search and rescue robot (RAPOSA), and it was empirically validated in a series of short user studies. This evaluation involved four experiments covering two-dimensional perception, depth perception, scene perception, and performing a search and rescue task in a controlled scenario. The stereoscopic display and head tracking are shown to afford a number of performance benefits. However, one experiment also revealed that controlling robot orientation with yaw input from the head tracker negatively influenced task completion time. A possible explanation is a mismatch between the abilities of the robot and the human operator. This aside, the studies indicated that the use of an HMD to create a stereoscopic visualization of the camera feeds from a mobile robot enhanced the perception of cues in a static three-dimensional environment and also that such benefits transferred to simulated field scenarios in the form of enhanced task completion times.</P>
CordDial: Usability study about new enhanced TUI with elastic feedback for mobile platform
Youngeun Song,Ian Oakley 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1
While commercial Tangible User Interfaces (TUI) based on capacitive touch screen has appeared, exploring its usability is one of important research area. Thus, we explored usability of TUI on a tablet using Fitts’ law. Our study compared multi-touch input, commercial TUI, and a TUI enhanced with an elastic cord that provides passive haptic feedback, during interaction on a tablet with five representative spanning movement tasks; pull, cross, bend, slide, and rotation. We run this empirical study with 13 participants and gathered throughput, error rate, and subjective ratings (NASA TLX) about combination of each input and task. Our result shows the TUI with the cord decrease overall performance for the bend task. Our work contributes finding new empirical data highlight performance variations between multi-touch and TUI, and suggesting novel TUI with an elastic cord for providing passive haptic feedback.