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This study examined how user handbreadth, brace shape and brace size of a Five-Point Grip Pen affects the performance of three screen tasks: writing, point-and-clicking, and drawing. Nine braces with three shapes (ball, ball-and-brick, and natural) and three brace sizes (large, medium and small) were tested for performance time, number of errors and(More)
Touch pens allow user to write directly on a computer screen. An ergonomically designed touch pen can improve user performance and reduce musculoskeletal injuries. This study investigates the touch pen use in three sections. First, observations of users' handwriting during three screen tasks: writing, pointing-and-clicking and drawing. Second, examinations(More)
Experiments were aimed at investigating the performance of various sizes of touch-pens. The touch-pens were of three different lengths (80, 110 and 140 mm) and four different diameters (5.5, 8, 11 and 15 mm). Three screen tasks were used for determining a reference of ideal dimensions of a pen-based product. Sixteen subjects used 12 touch-pens to perform(More)
Assistive drawing devices help Cerebral Palsy children to communicate and express themselves. This case study introduces the design of a unique assistive drawing device for a Cerebral Palsy child with upper limbs disability using the USERfit framework for user-centred design. The product design includes three parts: (1) hand-grip assistive device, (2) arm(More)
An important step during spine immobilization is application of a cervical collar. Clothing or hair covering the neck may impinge on this process. The purpose of this study was to evaluate the effect of clothing and hair covering the neck on immobilization using a cervical collar. Study participants were 18 female volunteers with long hair aged 20 to 28(More)
Traditional mobile phones depend on MultiTap, virtual or physical QWERTY keyboard for text entry, and they had some respective drawbacks include low input performance, occupying too large an area, high error rates, lack of feedbacks, etc. Therefore, some researches utilized the characteristics of the chording keyboard to improve input performance. Yet, as(More)