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어깨위로 들어올리기 작업시 의도적인 복근수축이 요부근 활성도와요추신전각도에 미치는 영향
김희원,권오윤,이충휘,전혜선,Kim, Hui-Won,Gwon, O-Yun,Lee, Chung-Hwi,Jeon, Hye-Seon 대한인간공학회 2006 大韓人間工學會誌 Vol.25 No.2
This study was conducted to evaluate the effect intentional contraction of abdominal muscles during lifting above shoulder on the muscles activities of the lower trunk and on the degree of lumbar extension. Fifteen healthy adult males were selected as test subjects. A 5kg weight was raised to the shoulder level, 20cm, and 40cm above the shoulder level. EMG activities of all muscles except the rectus abdominis were significantly greater when subjects were asked to contract their abdominal muscles intentionally during lifting(p<0.05). Degree of lumbar extension also significantly decreased with intentional abdominal contraction during the lifting. Also, degree of lumbar extension significantly increased with increase in lifting height(p<0.05). The results of this study show that intentional contraction of abdominal muscles during lifting above shoulder increases the EMG activities of external abdominis oblique, internal abdominis oblique, and erector spinae.
김희원,김형중,이정문,Kim, Hee-Won,Kim, Hyoung Joong,Lee, Jung-Moon 강원대학교 산업기술연구소 1995 産業技術硏究 Vol.15 No.-
This paper presents a new method for load distribution in a single-level tree network equipped with front-end processors. This method focuses on effective data distribution over a number of processors minimize job processing time. Optimal multiple installment load distribution algorithm is presented. Minimum number of processors that maximizes efficiency is decided theoretically.