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Guidelines for Designing of the Smart Heated Clothing through the User Needs Survey
Min-Uk Cho(조민욱),Yong-Ku Kong(공용구),Kyeong-Hee Choi(최경희),Hyun-Ho Shim(심현호),Jae-Kyeong Kim(김재경),Sang-Won Lee(이상원),Sooyeon Leem(임수연),Wonyoung Jeong(정원영),Siyeon Kim(김시연),Chae-Won Park(박채원) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10
MyotonPRO 시스템을 이용한 여러 근 수축 수준이 천지굴근의 기계적 속성에 미치는 영향 연구
신재민(Jae-Min Shin),공용구(Yong-Ku Kong),이주희(Ju-Hee Lee),심현호(Hyun-Ho Shim),김재경(Jae-Kyeong Kim),조민욱(Min-Uk Cho),박채원(Chae-Won Park),최경희(Kyeong-Hee Choi) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.3
Objective: The purposes of this study were to understand the effects of various levels of force exertions on the mechanical properties of hand muscles and to evaluate the correlation between the changes of mechanical properties and muscle fatigue. Background: Understanding mechanical properties of human muscles for any types of activities is very important to prevent muscle damages and injuries. Although electromyography (EMG) has been widely used to investigate the muscle activity and fatigue for human movements, EMG system may need a lot of effort and time to install, measure, and analysis. MyotonPRO which is a very simple and fast measurement device has been developed to understand muscle"s mechanical properties for various activities. There is few study for investigation of the mechanical properties such as stiffness, frequency, and decrement using a MyotonPRO. Method: Twenty healthy young men without orthopedics diseases participated in this study. The mechanical properties (stiffness, frequency, and decrement) of flexor digitorum superficialis were measured by using the MyotonPRO system for various muscle contraction (20%, 40%, 60%, and 80% MVCs) levels. The mechanical properties in resting condition was also measured before and after to understand the fatigue effects. Gender, handedness, pre/post and four-contraction level were assigned as independent variables in this study. Results: Statistical analysis revealed that the effects of gender, force exertion level, and interaction of gender and force exertion level were statistically significant on the both stiffness and frequency of mechanical properties of the flexor digitorum superficialis. Stiffness and frequency also showed generally increased as muscle fatigued based on the study of pre/post analysis. Conclusion: Stiffness and frequency, mechanical properties of flexor digitorum superficialis, showed a positive correlation with gender and force exertion level using a MyotonPRO system. These mechanical properties were also related with muscle fatigue. Application: MyotonPRO would be a good method for evaluating muscle activities of the muscles according to the levels of muscle contractions.
공용구(Yong-Ku Kong),김재경(Jae-Kyeong Kim),심현호(Hyun-Ho Shim),조민욱(Min-Uk Cho),박채원(Chae-Won Park),하길수(Kilsu Ha),임성원(Sungwon Lim),문준필(Junpil Moon),오병모(Byung-Mo Oh),최준희(Jun Hee Choi),한반석(Ban-Seok Han),최경희(Kyeo 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10
Objective: The purpose of this study was to validate the effectiveness of the newly designed (new) ultrasound device by comparing it with conventional (old) device through electromyography (EMG) signals, grip force and task time. Background: The prevalence rate of work-related musculoskeletal disorders (WMSDs) among sonographers is approximately four times higher that that of normal people. The awkward posture and over-exertion of upper extremities are the main risk factors for WMSDs. To reduce these risk factors, ergonomic designs such as adjustable control panels and transducer stations have been introduced for new ultrasound device. Method: A total of 10 obstetricians were participated in this study. To compare the scan stress between two devices (old and new), two types of experiments were performed: (1) Scanning task was carried out to measure muscle activity and grip force during scanning operations. (2) Positioning task was performed to quantify the load while obstetricians were moving the devices. Results: The new device showed significantly less muscle activities and grip forces than old device in scanning task. The task time of the new device was significantly shorter than that of the old one. Conclusion: Overall, the performance of the new device was evaluated more positive than that of old device. Application: Methods and findings of this study could be used to evaluate existing and newly developed ultrasound devices.