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Author: Lyons, Kenton Michael × Author: Starner, Thad × End date: 2006 ×

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Now showing 1 - 6 of 6
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Reading on the Go: An Evaluation of Three Mobile Display Technologies

2006 , Vadas, Kristin , Lyons, Kenton Michael , Ashbrook, Daniel , Yi, Ji Soo , Starner, Thad , Jacko, Julie A.

As mobile technology becomes a more integral part of our everyday lives, understanding the impact of different displays on perceived ease of use and overall performance is becoming increasingly important. In this paper, we evaluate three mobile displays: the MicroOptical SV-3, the Sony Librie, and the OQO Model 01. These displays each use different underlying technologies and offer unique features which could impact mobile use. The OQO is a hand-held device that utilizes a traditional transflective liquid crystal display (LCD). The MicroOptical SV-3 is a head-mounted display that uses a miniature LCD and offers hands free use. Finally, the Librie uses a novel, low power reflective electronic ink technology. We present a controlled 15-participant evaluation to assess the effectiveness of using these displays for reading while in motion.

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Twiddler Typing: One-Handed Chording Text Entry for Mobile Phones

2003 , Lyons, Kenton Michael , Starner, Thad , Plaisted, Daniel , Fusia, James Gibson , Lyons, Amanda , Drew, Aaron , Looney, E. W.

An experienced user of the Twiddler, a one--handed chording keyboard, averages speeds of 60 words per minute with letter--by--letter typing of standard test phrases. This fast typing rate coupled with the Twiddler's 3x4 button design, similar to that of a standard mobile telephone, makes it a potential alternative to multi--tap for text entry on mobile phones. Despite this similarity, there is very little data on the Twiddler's performance and learnability. We present a longitudinal study of novice users' learning rates on the Twiddler. Ten participants typed for 20 sessions using two different methods. Each session is composed of 20 minutes of typing with multi--tap and 20 minutes of one--handed chording on the Twiddler. We found that users initially have a faster average typing rate with multi--tap; however, after four sessions the difference becomes negligible, and by the eighth session participants type faster with chording on the Twiddler. Furthermore, after 20 sessions typing rates for the Twiddler are still increasing.

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Revisiting and Validating a Model of Two-Thumb Text Entry

2006 , Clarkson, Edward C. , Lyons, Kenton Michael , Clawson, James , Starner, Thad

MacKenzie and Soukoreff have previously introduced a Fitts' Law--based performance model of expert two--thumb text entry on mini--QWERTY keyboards. In this work we validate the original model and update it to account for observed behavior. We conclude by corroborating our updated version of the model with our empirical data. The result is a validated model of two-thumb text entry that can inform the design of mobile computing devices.

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KeyMenu: A Keyboard Based Hierarchical Menu

2002 , Lyons, Kenton Michael , Patel, Nirmal J. , Starner, Thad

KeyMenu is a keyboard based hierarchical menu system originally designed for use on a wearable computer. The menu uses a one to one mapping between buttons on the keyboard and menu items. The KeyMenu leverages off of the advantages of other pointer based menus such as Marking Menus. It provides support for both novice and expert user interaction through the use of a delay in popping up the menu. Finally, by using a consistent physical action we support the transition from novice to expert.

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Expert Chording Text Entry on the Twiddler One-Handed Keyboard

2004 , Lyons, Kenton Michael , Plaisted, Daniel , Starner, Thad

Previously, we demonstrated that after 400 minutes of practice, ten novices averaged over 26 words per minute (wpm) for text entry on the Twiddler one-handed chording keyboard, outperforming the multi-tap mobile text entry standard. Here we present an extension of this study that examines expert chording performance. Five subjects continued the study and achieved an average rate of 47 wpm after approximately 25 hours of practice in varying conditions. One subject achieved a rate of 67 wpm, equivalent to the typing rate of the last author who has been a Twiddler user for ten years. We provide evidence that lack of visual feedback does not hinder expert typing speed and examine the potential use of multiple character chords (MCCs) to increase text entry speed. We demonstrate the effects of learning on various aspects of chording and analyze how subjects adopt a simultaneous or sequential method of pushing the individual keys during a chord.

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Widespread Easy and Subtle Tracking with Wireless Identification Networkless Devices -- WEST WIND: an Environmental Tracking System

2000 , Lyons, Kenton Michael , Kidd, Cory D. , Starner, Thad

In this paper we introduce and describe a radio frequency-based system for location identification and tracking. The basic design of the system consists of transmitters in the environment, transceivers on the person or object for which location information is desired, and a receiver in the environment. Each of these three pieces of hardware and their associated software are discussed in this paper. We also talk about system design considerations, privacy concerns, and current and future applications of the system.

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