Integrated text entry from power wheelchairs

Integrated text entry from power wheelchairs

s of the ACM Conference on Human Factors in Computing Systems (CHI ‘03), 5 – 10 April 2003 (New York: ACM Press), pp. 942 –

Text entry using soft keyboards

Text entry rates are explored for several variations of soft keyboards. We present a model to predict novice and expert entry rates and present an empirical test with 24 subjects. Six keyboards were examined: the Qwerty, ABC, Dvorak, Fitaly, JustType, and telephone. At 8± 10 wpm, novice predictions are low for all layouts because the dominant factor is the visual scan time, rather than the move...

Speech-Assisted Mobile Text Entry

Dynamics and probabilistic text entry

We present a gestural interface for entering text on a mobile device via continuous movements, with control based on feedback from a probabilistic language model. Text is represented by continuous trajectories over a hexagonal tessellation, and entry becomes a manual control task. The language model is used to infer user intentions and provide predictions about future actions, and the local dyn...

Force Sensorless Power Assist Control for Wheelchairs Considering Caster Effects

Power Assist Wheelchair (PAW) has being developed for users and caregivers in current high aging society. As a human-machine system, it is important for PAW to sense the human force and operation. In this paper, a Disturbance Observer (DOB) based force estimator is applied to PAW to estimate external forces including the human force, the rolling resistance and the sliding resistance. The rollin...