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목 건강 고위험군의 움직이는 모니터 사용에 따른 두부전방 자세 교정 효과에 관한 연구
최경희(Kyeong-Hee Choi),공용구(Yong-Ku Kong),심현호(Hyun-Ho Shim ),조민욱(Min-Uk Cho),박채원(Chae-Won Park),홍보람(Bo-Ram Hong),김승훈(Seoung-Hoon Kim),정현주(Hyun-Ju Jung),송현아(Hyun-A Song),류지헌(Ji-Heon Ryu),김재경(Jae-Kyeong Ki 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10
Objective: The aim of this study was to verify the correction effect of Forward Head Posture (FHP) by using Moving Monitor in a high-risk group of the neck. Background: Office workers who have been used VDTs are subject to high loads on the neck and shoulders during their work due to the high frequency of FHP. Thus, our research team developed a Moving Monitor Arm that continuously induced calibration movements when the users use the monitor. Method: Seven participants who rated as a high-risk group of the neck to study the effect of FHP correction using the Moving Monitor. The fatigue and posture of the neck were quantified using Flexion Relaxation Ratio (FRR), Onset Angle, Offset Angle, Craniovertbral Angle (CVA) and Subjective Discomfort Rating in this study. Results: The effects of task pre/post on the FRR and subjective discomfort, and the effect of monitor type on the Onset/Offset angles was significant in this study, respectively. Conclusion: Based on the results of the experiment, correction effect of Moving Monitor was verified. Application: The results of this study showed that moving monitors can be applied to prevent musculoskeletal disorders associated with VDTs.
작업-휴식 주기 변화에 따른 허리 굴곡 작업의 작업 부하 비교
이주희(Ju-Hee Lee),공용구(Yong-Ku Kong),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 aims of this study is to compare the workloads at different work-rest period (Standard & non-standard work) in lumbar flexion work and to find a more suitable cycle time for the worker. Background: In the industrial field, there are many works that cause lumbar flexion and it is main risk factor associated with Work-related Musculoskeletal Disorders (WMSDs). To reduce the workload of the worker, a lot of study has been studied on the work-rest cycle time and standard working hours. Nevertheless, in the field, "nonstandard work" without adequate rest period is frequently performed by workers to finish work fast. This non-standard work can cause more fatigue and pressure on the worker. Method: The experiment was conducted on 20 male adults. Participants performed the same task at the same time with two different work-break periods. The standard work consisted of 30 seconds of work / 15 seconds of rest, and the non-standard work consisted of 600 seconds of work / 300 seconds of rest. Two type of tasks were repeated for a total of 45 minutes. A variety of biomarkers were used to compare workloads (Flexion-relaxation phenomenon (FRP) parameter, EMG-signal, Heart rate, Subject discomfort rating). Results: In the FRP variables, it was confirmed that the non-standard work caused more fatigue than the standard work. In the EMG-signal, there was more load in the non-standard work than standard work. There was no significant difference in heart rate and subjective discomfort, however, it is expected that there will be a significant difference in long hours of work more than 8 hours. Conclusion: Despite the short working hours, non-standard work caused more fatigue than standard work, which is likely to show a bigger difference in actual working time (more than 8 hours). Therefore, managers should encourage to comply with standard work hours to reduce workload of workers. Application: This study is expected to encourage workers to comply the standard working time, and further reduce industrial accidents caused by excessive work.
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
작업 부하 고려를 통한 농작업 자세 평가도구의 수정 및 기존 도구와의 비교
공용구(Yong-Ku Kong),최경희(Kyeong-Hee Choi),박채원(Chae-Won Park),김승연(Seoung-Yeon Kim),김민정(Min-Jung Kim),조민욱(Min-Uk Cho) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.5
Objective: The purposes of this study were to revise the AWBA (Agricultural Whole-Body Assessment) considering disc compression according to various workloads and compare Re-AWBA with existing posture risk assessment tools (RULA, REBA, OWAS, and AWBA). Background: Due to the nature of the agricultural site, workers have been frequently exposed to musculoskeletal disorders risk according to awkward working postures. AWBA was developed to overcome the limitations of existing posture risk assessment tools in evaluating such agricultural work postures. AWBA consisted of selecting upper-limb posture and lower-limb posture from AULA (Agricultural Whole-Body Assessment) and ALLA (Agricultural Lower-Limb Assessment). Since AWBA did not consider the workload, there was a limitation in assessing workloads and weights. Method: The modification of AWBA was conducted based on the compression force of the lumbar disc computed by 3D-SSPP software. According to working type (onehanded and two-handed) and weight (0, 2, 4, 6, 8, and 10kg), the lumbar disc compression force was used to subdivide the current risk levels of AWBA. K-means analysis was used to subdivide each level, and the number of sub-levels was decided by the Nbclust package in Rstudio. For comparison between tools, the posture risk of 30 agricultural works was evaluated according to the height of the working point. Results: Based on the current level of AWBA, level 1 and level 2 were divided into three sub-levels, and level 3 and level 4 were divided into four. A total of 11 tables were newly created according to the existing AWBA"s posture combination and workload type. As a result of comparing the posture risk assessment results according to the height of the working point, AWBA and Revised AWBA evaluated higher than other tools at the lower working point. Conclusion: Revised AWBA was modified by subdividing the existing AWBA results based on the lumbar compression force only. Therefore, in further studies, Re-AWBA would be improved by collecting various biomechanical data according to each posture and workload. Application: Revised AWBA could be used more effectively than existing tools for evaluating the risk in agricultural work. It is believed that it would help eliminate the risk factors that exist in agricultural sites.
MyoVision 시스템을 활용한 허리 근육 건강 상태에 따른 피로도에 대한 생체지표 변화 연구
심현호(Hyun-Ho Shim),최경희(Kyeong-Hee Choi),공용구(Yong-Ku Kong),박채원(Chae-Won Park),김승연(Seoung-Yeon Kim),김민정(Min-Jung Kim),조민욱(Min-Uk Cho) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.2
Objective: The aim of this study was to identify changes in bio-parameters before and after muscle fatigue according to the health status of the lumbar muscles. Background: Low back pain is frequently occurring pain area in various industrial field. There are a lot of researches that compare bio-parameters on healthy people and low back pain patients or analyze the change on bio-parameter by fatigue effect. However, researches that compare bio-parameters on lumbar muscle health and fatigue are insufficient. Method: The experiment was conducted on 15 male adults. All participants performed Sorensen test that was consist of 30 seconds of task / 30 seconds of rest for 20 minutes. Myovision was used to classify muscle and people health condition into three types (chronic, normal, acute) according to muscle activity and a variety of bio-parameters were used to compare fatigue pre/post. Results: As a result, the Flexion Relaxation Ratio (FRR) decreased in the normal muscle group and increased in the acute muscle group after muscle fatigue. Although generally the %frequency decreased in all of group, the decrease in normal muscle groups was lower than in chronic/acute muscle groups. Overall, subjective discomfort increased in all muscle groups, but the increase discomfort in normal muscle groups was lower than that of acute muscle groups. Conclusion: In general, healthy muscle groups showed a decrease in FRR after muscle fatigue, while non-healthy muscle groups showed an increasing trend. Therefore, when assessing muscle fatigue from performing a task using FRR, it might be said that post-classification of muscle health conditions should be performed and then interpreted. In addition, non-healthy muscle group was found to be more vulnerable to fatigue by using fatigue parameters and subjective discomfort. Therefore, nonhealthy muscle groups were likely to require continuous monitoring in industrial field. Application: Changes in FRR after fatigue would be evaluated differently between healthy and non-healthy muscle groups.