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스마트 자동차 좌석을 이용한 엉덩이의 동적 균형조절이 코어 등근육 활성도에 미치는 효과
최우진,김성훈,여성윤,강구창,손문준 대한산업공학회 2022 대한산업공학회지 Vol.48 No.6
Sitting in a car seat for a long time causes fatigue in muscles such as trapezius and paraspinal muscles, which increases muscle fatigue and tension and eventually causes in degenerative spinal changes and pain. Therefore, the authors attempt to investigate the effect of trapezius and lower back muscle activity changes on whether fatigue may be improved by balancing the buttock contact pressure in the sitting position. The purpose of this study was to assess the electrophysiologic effect of dynamic balance control for the trapezius and lower core back muscles through wireless surface electromyographic evaluation using the smart car seat equipped with an ICT-based air bladder. Surface electromyography (sEMG) was measured for each 32 participant’s trapezius and lumbar back muscles in three phases: 1) initial on standing, 2) seated for 25 minutes without balancing ischial pressure, 3) seated for 25 minutes with balancing ischial pressure, and then sEMG was measured for 1 minute on the standing of three individual phases. In the trapezius and low back muscles, the sEMG value of the three-phase MVIC showed a statistically significant increase in the left side compared to the right side (p<0.0001). % MVIC difference increased in unbalanced seating (7.32±0.83) compared to the initial measure (7.24±1.72). However, it decreased with balancing seating(6.73±1.81, p=0.049). There was no statistically significant difference in the overall %MVIC differences between both lower back muscles among three phases (p=0.35), but the balanced seating showed a slightly increased % MVIC difference (p=0.10) in contrast to that of the trapezius. Balanced control of hip pressure using automatic logic control of ICT-based smart car seats has the effect of reducing the left-right difference in muscle activity of upper core muscles compared to that of non-balanced seating. Conclusively, it is believed that the difference in the left and right imbalances in the activity of trapezius can be alleviated through the pressure balance seating at the driver’s seat, and the effect of improving muscle fatigue can be expected. Nevertheless, driving in a sitting position, regardless of balance control, the lower core muscles continue to increase the activity of the lumbar muscles, which inevitably causes pain, discomfort, and fatigue over time. Wireless bio-sensing and balanced seat control using ICT-integrated smart car seats can be used as important application science fields that can improve muscle fatigue and degenerative spinal changes associated with professional workers.
자동차 시트에서 자동으로 좌우 엉덩이 부분 독립제어가 가능한 Air bladder를 이용한 척추 골반 균형 개선 효과에 대한 연구
최우진(Woojin Choi),여성윤(Seongyun Yeo),강구창(Guchang Kang),김성훈(Sunghoon Kim),손문준(Moonjun Sohn) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
This study is to investigate changes in the drivers spinal pelvis posture between imbalanced and balanced sitting in the smart car seat using radiographic parameters. A smart car seat capable of balancing the air bladders was used to automatically measure the pressure difference between the participants hips and balance them on IoT based controller. When comparing x-ray imaging of balanced seating with initial standing versus unbalanced seating for a total of 32 applicants, the shoulder and pelvic height differences were statistically significantly reduced during a 25-minute balanced seating (p=0.0026, 0.0013 versus p=0.0188, 0.0105, respectively). There was no statistically significant difference in radiographic changes between initial and 25-minute unbalanced seating. The use of smart car seats equipped with air bladder allows drivers with spinal, shoulder, and pelvic imbalance to sit balanced while driving, thereby reducing the progress of driving-related-spine diseases and ultimately contributing to improved driving comfort.
다이어프램 타입 펌프 소형화 개발을 위한 설계 인자 최적화 연구
김성훈(Sunghoon Kim),이인호(Inho Lee),양태형(Taehyoung Yang),강구창(Guchang Kang) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
A convenience device for a vehicle seat using a pneumatic adjuster system, which is a new structure based on the diaphragm type motor pump. We are doing operating pressure, flow rate, noise, and reliability test about pump performance. This device is fully integrated so we can reduce core parts size and weight of pump. As a result, this device applies to various seat parts like lumbar support or others. There are several types of pneumatic adjuster system but most of systems are imported from abroad. This document shows system localization and improvement of existing diaphragm type pump.