Eye-typing performance results are reported from controlled studies comparing an on-screen keyboard and EyeWrite, a new on-screen gestural input alternative. Results from the first pilot study suggest the presence of a learning curve that novice users must overcome in order to gain proficiency in EyeWrite's use (requiring practice with its letter-like gestural alphabet). Results from the second longitudinal study indicate that EyeWrite's inherent multi-saccade handicap (4.52 saccades per character, frequency-weighted average) is sufficient for the on-screen keyboard to edge out EyeWrite in speed performance. Eye-typing speeds with EyeWrite approach 5 wpm on average (8 wpm attainable by proficient users), whereas keyboard users achieve about 7 wpm on average (in line with previous results). However, EyeWrite users leave significantly fewer uncorrected errors in the final text, with no significant difference in the number of errors corrected during entry, indicating a speedaccuracy trade-off. Subjective results indicate that participants consider EyeWrite significantly faster, easier to use, and prone to cause less ocular fatigue than the on-screen keyboard. In addition, EyeWrite consumes much less screen real-estate than an on-screen keyboard, giving it practical advantages for eye-based text entry.
Abstract. The free availability of GOES satellite data every 15 minutes makes these data an attractive tool for studying short-term changes on cloud-free volcanoes in the Pacific basin. We use cloud,free GOES-9 data to investigate the chronology of the january 1997, episode 54 eruption of Kilauea Volcano, Hawaii. Seventy-six images for this effusive eruption were collected over a 60-hour period and show the opening •and shutdown of active fissures, the draining and refilling of the Pu'u 'O'o lava lake, and the cessation of activity at the ocean entt3,.
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