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오해옥,감신,한창현,황병덕,문효정,차병준,박상연 대한류마티스 건강전문학회 2001 근관절건강학회지 Vol.8 No.1
This study was reformed to examine the annual experience rate of musculoskeletal symptom and its related factors in rural farmers. Six-hundred and sixty one rural farmers were investigated by questionnaire survey through interview from July 1 to July 31 in 2000. The results were as follows : The rural farmers who had experienced musculoskeletal symptom during recent 1 year was 82.7% in male, 92.1% in female. The annual experience rate of musculoskeletal symptom by part of the body in male were turned out as back: 42.3%, leg and knee: 36.4%, shoulder; 21.4%, arm and hand; 12.7%, elbow: 7.7%, hip: 6.8%, neck: 6.8%, ankle and foot; 6.4% in order. The annual experience rate of musculoskeletal symptom by part of the body in female were turned out as back: 59.4%, leg and knee; 48.5%, shoulder; 20.2%, arm and hand: 13.8%, hip: 10.7%, neck: 6.8%, ankle and foot: 6.3%, elbow: 5.0% in order. The annual experience rate of musculoskeletal symptom, back pain, and Pain on leg and knee were significantly higher in female. In male, the experience rate of musculoskeletal symptom was different significantly according to educational level, family size, economic status, status of smoking, duration of farming, type of major agricultural affairs. By the multiple logistic regression analysis far experience of musculoskeletal symptom, family size and economic status were the significant variables. It was higher in male with no or one family living together and low economic status. In female, the experience rate of musculoskeletal symptom was different significantly according to body mass index, perceived health status, type of agricultural affairs. By the multiple logistic regression analysis for experience of musculoskeletal symptom, body mass index, perceived health status, and type of major agricultural affairs were the significant variables. It was higher as female farmer's body mass index was increasing and when female farmer's perceived health status was not healthier, and it was lower when female farmer did livestock farming as major agricultural affair. The experience rate of musculoskeletal symptom was higher in the busy season for farmers and treatment methods for musculoskeletal symptom were physical therapy, medication, herb medical treatment, etc. In conclusion, because most of farmers experience musculoskeletal symptom, continuous systematic study on musculoskeletal symptom of farmers and active effort to prevent and manage musculoskeletal symptom of farmers are necessary.
자동차용 현가장치의 반능동 제어 시스템의 설계파라미터에 대한 연구
박호,한창수,이명호,노병옥 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
In the determination of control laws of semi-active suspension system, optimal control theory is applied, which used in the design of fully active suspension system and in the performance index sense. Optimal semi-active control laws are designed, and the computer program is developed for estimation of performance in the time and frequency domain. It is certified that in the semi-active control system, it is desirable to minimize the spring constant and damping coefficient as possible in the given constraints. The effect of performance improvement which is almost equal to fully active type is obtained.