Abstract: As abnormal posture caused by prolonged smartphone use increases, its related disease also increases. It is time to prevent this problem. This study aim to figure out how much real-time visual feedback has an effect on postural correction. Healthy 34 participants were instructed to keep neutral posture and then use smartphone. Each participant was instructed to maintain a neutral posture with their elbows positioned in line with the trunk and flexed 90–120˚ and keep the trunk upright, chin tucked, scapula slightly protracted and depressed and sole of the foot on the floor 1) for 15 minutes in non feedback condition, after 3 minutes resting period, 2) for 15 minutes in visual feedback condition while maintaining their original posture. When participants consciously apply feedback for postural correction, participants can check the movement of scapula and forward head level as they apply posterior visual feedback. The result of this study had a significant difference in the meaning of

• Publication Date: 10-Dec-2017
• DOI: 10.15224/978-1-63248-140-5-34
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Abstract: There are many errors to affect the system hit probability. Fixed bias, variable bias and random error are main categories for many errors. In this paper, a parallax error is considered. The parallax error belongs to the fixed bias. The fixed bias cannot be controlled by the shooting control device. The parallax error depends on the distance between the positions of the EOTS (electronic optical tracking device) and the gun. We calculate the error effect at the target by using the mil unit. The definition of a mil is based on a unit circle with a radius of one and 6400 mils mean the circumference in one turn. This analysis for the parallax error is a good guideline for design of the combat vehicle with gun having good system hit probability.

• Publication Date: 10-Dec-2017
• DOI: 10.15224/978-1-63248-140-5-40
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