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Lee, Songil,Kyung, Gyouhyung,Lee, Jungyong,Moon, Seung Ki,Park, Kyoung Jong Taylor Francis 2016 Ergonomics Vol.59 No.11
<P>Recently, some smartphones have introduced index finger interaction functions on the rear surface. The current study investigated the effects of task type, phone width, and hand length on grasp, index finger reach zone, discomfort, and muscle activation during such interaction. We considered five interaction tasks (neutral, comfortable, maximum, vertical, and horizontal strokes), two device widths (60 and 90 mm) and three hand lengths. Horizontal (vertical) strokes deviated from the horizontal axis in the range from -10.8 degrees to -13.5 degrees (81.6-88.4 degrees). Maximum strokes appeared to be excessive as these caused 43.8% greater discomfort than did neutral strokes. The 90-mm width also appeared to be excessive as it resulted in 12.3% increased discomfort relative to the 60-mm width. The small-hand group reported 11.9-18.2% higher discomfort ratings, and the percent maximum voluntary exertion of their flexor digitorum superficialis muscle, pertaining to index finger flexion, was also 6.4% higher. These findings should be considered to make smartphone rear interaction more comfortable. Practitioner Summary: Among neutral, comfortable, maximum, horizontal, and vertical index finger strokes on smartphone rear surfaces, maximum vs. neutral strokes caused 43.8% greater discomfort. Horizontal (vertical) strokes deviated from the horizontal (vertical) axis. Discomfort increased by 12.3% with 90-mm-vs. 60-mm-wide devices. Rear interaction regions of five commercialised smartphones should be lowered 20 to 30 mm for more comfortable rear interaction.</P>
A New Grasp Coding Method for Smart Devices
( Songil Lee ),( Gyouhyung Kyung ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
The aim of the current study was to develop a new coding method for smart devices. Though the grasp posture can be regarded as a static gesture, there are few studies on grasp coding methods compared to those on gesture coding methods. By integrating and extending previous studies, we suggested a new coding method that simultaneously considers ``hand information`` and ``object information``. The proposed new grasp coding method can effectively describe various types of grasp postures by using a 26 x 8 matrix per hand, hence can be used to develop PUIs (Physical User Interfaces) for various products including smart phones
Park, Sungryul,Choi, Donghee,Yi, Jihhyeon,Lee, Songil,Lee, Ja Eun,Choi, Byeonghwa,Lee, Seungbae,Kyung, Gyouhyung Elsevier 2017 Applied ergonomics Vol.60 No.-
<P><B>Abstract</B></P> <P>This study examined the effects of display curvature (400, 600, 1200 mm, and flat), display zone (5 zones), and task duration (15 and 30 min) on legibility and visual fatigue. Each participant completed two 15-min visual search task sets at each curvature setting. The 600-mm and 1200-mm settings yielded better results than the flat setting in terms of legibility and perceived visual fatigue. Relative to the corresponding centre zone, the outermost zones of the 1200-mm and flat settings showed a decrease of 8%–37% in legibility, whereas those of the flat setting showed an increase of 26%–45% in perceived visual fatigue. Across curvatures, legibility decreased by 2%–8%, whereas perceived visual fatigue increased by 22% during the second task set. The two task sets induced an increase of 102% in the eye complaint score and a decrease of 0.3 Hz in the critical fusion frequency, both of which indicated an increase in visual fatigue. In summary, a curvature of around 600 mm, central display zones, and frequent breaks are recommended to improve legibility and reduce visual fatigue.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Curvatures of 600 mm and 1200 mm were more legible and less visually fatiguing than a flat display. </LI> <LI> Legibility decreased by 8%–37% in the outermost zones of the 1200-mm and flat settings. </LI> <LI> Visual fatigue increased by 26%–45% in the outermost zones of the flat setting. </LI> <LI> A 30-min visual search task induced visual fatigue. </LI> <LI> Use of ∼600 mm curvature, avoiding the outer zones, and frequent breaks are advised for VDT tasks. </LI> </UL> </P>