• Title/Summary/Keyword: OWAS

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Observing Children's Body Movement in Daily Activities : An Example of OWAS Application (활동 내에서의 유아 몸 움직임에 대한 관찰 : OWAS 인간공학 측정법의 적용 사례)

  • Yun, Eunju
    • Korean Journal of Childcare and Education
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    • v.8 no.2
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    • pp.139-155
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    • 2012
  • This study aimed to glean lessons for desirable early childhood physical education programs by contouring the current paradigms on body or physical activities in the area of early education for young children. It also aimed to analyze their postures while participating in daily activities. The research method for analysis of children's postures while doing daily activities was OWAS(Ovako Working Posture Analysing System) which has been extensively used in ergonomics. Components of data analysis have been redesigned on the basis of information gathered from OWAS with the help of ergonomic experts. The results showed different percentages of children's movements according to activities such as whole class meeting, small group activity and outdoor activity. Small group and outdoor activities can be considered the most desirable physical activities not only for cognitive and social development but also for physical development. And it is recommended to reconstruct the quality and nature of whole class meetings in order to coordinate the physical nature of young children.

The structure Optimization Research of the Automation Welding Equipment of the Large L-type Using the Response Surface Method (반응표면법을 이용한 대형 L-type 자동화용접장치의 구조최적화 연구)

  • Jang, Junho;Jung, Wonjee;Lee, Dongsun;Jung, Jangsik;Jung, Sung Ho
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.1
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    • pp.138-144
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    • 2013
  • The automation technology for overlay welding is needed due to the occurrence of severe corrosion and abrasion on the surface of internal contact in different shape of fittings. In Korea, different shapes of fittings have been manufactured by using the imported equipment of overlay welding automation at some companies. Thus the research on the development of overlay welding automation system (in short, OWAS) for a large L-type tube is urgently needed. In this paper, the investigation is focused on the optimal design of a supporting base for the (currently developing) OWAS of large L-type tube. Specifically we assume that the base which supports the equipment during the process of overlay welding is loaded as self-weight in the direction of gravity through static analysis especially when it is rotated 180 degree on the OWAS. For optimal design of a supporting base for OWAS of large L-type tube, Solidworks(R) (for 3-dimensional modelling) and ANASYS Workbench(R) (for structural analysis) are incorporated so as to proceed an optimization routines based on Response Surface Method (RSM) and Design of Experiment (DOE). In more specific, DOE finds out major factors (or dimensions) of the supporting base by using MINITAB(R). Then the regression equations between design variables (the major factors of supporting base) and response variables (deformation, stress and safety factor for the supporting base), which will be resulted in by RSM, verify the major factors of DOE. In the next step, Central Composite Design (CCD) plans 20 simulations of ANASYS Workbench(R) and then figures out the optimal values of design variables which will be reflected on the manufacturing of supporting base. Finally welding experiment is conducted to figure out the influence of overlay welding quality in applying the optimized design values of supporting base to the actual OWAS.

A Comparison of Excess Rates of Risk Factors among Ergonomic Assessment Tools for Automobile and Part Manufacturing Industry Workers (자동차 업종의 근골격계질환 발생 위험요인에 대한 인간공학적 평가도구간 초과율 비교)

  • Chung, Eun Kyo;Kim, Jung Man
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.19 no.2
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    • pp.88-95
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    • 2009
  • There are many assessment techniques used for occupational risk factors of MSDs in the workplaces. However, because all ergonomic assesment techniques or tools are based on theoretical background derived from workphysiology, biomechanics, psychophysics, industrial hygiene, work system, and etc, it is impossible to compare the assessment techniques. This study was conducted to compare the excess rates of risk factors among ergonomic assessment techniques and to make alternative methods. Site-visits to 6 automobile products and parts company provided data for process repeated work where the produced data was examined for evaluating the relationship between workplace lay-out and work posture by using ergonomic assessment techniques. We evaluated 157 jobs for simple repeated work and 37 jobs for manual materials handling (MMH). In simple repeated work, the exceeded rates of AC were 36.3% in OWAS method and 93.0% in RULA method. The exceeded rate for RULA method was significantly higher than those for OWAS method (p<0.05). In MMH, the exceeded rates of AC were 80.0% in NLE method and 76.5% in WAC method. Statistically significant differences were not identified in the exceeded rates for NLE and MAC methods (p<0.05). The analyzed results among ergonomic assessment techniques (OWAS, RULA, NLE/WAC) were applied to the same work places performing simple repeated work and manual materials handling simultaneously. The applied results showed statistically significant differences (p<0.05) among ergonomic assessment techniques (OWAS, RULA, NLE/WAC). Exceeded rates of four ergonomic assessment techniques in decreasing order was "RULA>NLE>WAC>OWAS". The RULA method was the strongest assessment technique for automobile products and parts company. We discovered that the results could easily be overestimated or underestimated when the ergonomic assessment techniques were not applied correctly during the evaluation process. Therefore, we recommend using at least 2 methods when evaluating and analysing the results.

Anlaysis on the Influence of Work-related Musculoskeletal Disorders in Explosive Blasting Performance (화약류발파작업이 근골격계에 영향을 미치는 자세평가분석)

  • Lee Jung-Hoon;Ahn Myung-Seog
    • Explosives and Blasting
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    • v.23 no.1
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    • pp.1-8
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    • 2005
  • Explosive blasting performance is composed of charging, tamping and connecting performance, which need lots of power and time. Thus, operator's inconvenience and muscle load are increased by their pose. Then it's unavoidable for one to make a human error. As a result, blasting accidents and disasters of explosives may happen. So we need to have systematic study. According to their pose's changing we have OWAS, RULA, REBA, OSHA, ISI, NLE, TVAV, BLUE-X. In this article, OWAS, RULA, REBA have been evaluated. As a result of this research, it is shown that work-related musciloskeletal disorders are related to the second accident's happening.

A Study of the Ergonomics Evaluation of a Water Heater's Case Manufacturing Factory

  • Hsu, Yao-Wen;Chung, Yi-Chan;Chiu, Chung-Ching;Chen, Ching-Piao;Tsai, Chih-Hung
    • International Journal of Quality Innovation
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    • v.9 no.1
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    • pp.22-40
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    • 2008
  • Unnatural working postures usually cause musculoskeletal problems for workers in work field, especially in traditional industry. Many analysis and survey methodologies have been developed to identify unnatural postures and disorder risks in workplaces. The Ovako Working Posture Analyzing System (OWAS) and Nordic Musculoskeletal Questionnaire (NMQ) are the representative methods and applied widely. This study applied the both tools to investigate the work field of a manufacturing factory of the water heater's case. We divided the manufacturing process into nine workshops, took the pictures of working motions by DV camera and analyzed the postures on OWAS. From the OW AS results, we could identify the risks level of musculoskeletal symptoms as four Action Categories (AC). And from the comparison of OWAS and NMQ results, we could provide the suggestions to improve the working methods and environment. From the results of OWAS, we found that the operators' head/neck and back were above AC3 in some workshops. If the situation continued in long period, the operators might have the risk to get musculoskeletal symptoms. From the investigation of NMQ, we also found that the percentage of aches on neck, shoulders and lower back were higher than other parts of body. The correlation between aches and jobs was more than 75%. So we provided some suggestions to improve: work rotation and adjustment of work surface/height to fit in with Ergonomics. Then the risks of musculoskeletal symptoms would be reduced.

Evaluation of 119 emergency medical technicians' work related musculoskeletal disorders risk with regard to patient lifting procedures (119 구급대원의 업무관련성 근골격계 손상 위험성 평가 - 환자 들기 작업을 중심으로 -)

  • Son, Jeong-Won
    • The Korean Journal of Emergency Medical Services
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    • v.23 no.1
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    • pp.101-112
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    • 2019
  • Purpose: The purpose of the study was to contribute to the prevention of musculoskeletal disorders (MSDs) in 119 emergency medical technicians (EMTs) by evaluating ergonomic risk factors of patient lifting work-postures. Methods: Four procedures were evaluated: using long back-board (LBB) on the sitting and standing main stretcher, using variable stretcher on the sitting and standing main stretcher. Wok-postures were assessed during training. Results: In using LBB on the sitting main stretcher, the OWAS-score was Mode:3 (Mean:2.30, Maximum:3), the REBA-score was Mode:9 (Mean:7.61, Maximum:11), requiring improvement soon. In using LBB on the standing main stretcher, the OWAS-score was Mode:3 (Mean:2.33, Maximum:3), requiring as soon as possible corrective action, the REBA-score was Mode:6 (Mean:5.44, Maximum:11), requiring improvement. In using variable stretcher on the sitting main stretcher, the OWAS-score was Mode:1 (Mean:1.85, Maximum:3), not requiring corrective action, the REBA-score was Mode:6 (Mean:6.78, Maximum:11), requiring improvement. In using variable stretcher on the standing main stretcher, the OWAS-score was Mode:3 (Mean:2.84, Maximum:3), requiring as soon as possible corrective action, the REBA-score was Mode:11 (Mean:9.38, Maximum:11), requiring immediate improvement. Conclusion: All four-procedures showed improvement in work-posture. Thereby, required attention and management in training, occupational health professionals should participate in change of lifting-method, and programs aimed at preventing MSDs should be developed and implemented in fire-academy and fire-station.

OWAS and EMG-based Mason's Physical Workload Measurement (OWAS 및 근전도 기반 석공 작업부하 비교연구)

  • Seo, Byoung-Wook;Lim, Tae-Kyung;Lee, Dong-Eun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.194-195
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    • 2015
  • Methods for measuring the physical workload of construction workers are classified into posture assessment techniques (i.e., OWAS, RULA, etc.) and physiological measurement techniques (i.e., EMG, heart rate, etc.). The one does not quantify the workload on a specific body part of a worker by considering the weight of the hand tools or materials on hand and time for holding a particular posture. This paper presents a procedure for evaluating a physical demand using the electromyography (EMG) sensor. This study compares the EMG measurement and the posture assessment. The case study is carried out on a masonry operation.

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Risk Factor Analysis of Printing Business Workers (인쇄업종 근로자들의 작업위험성 평가)

  • Choi Ho Dal;Kim Hyun Ho;Jeong Byung Yong;Yang Hong Seok
    • Journal of the Korea Safety Management & Science
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    • v.7 no.3
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    • pp.63-72
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    • 2005
  • The purpose of this study is to examine the prevalence of musculoskeletal disorders and ergonomic risk factors for workers of printing business. A self-reporting survey and task analysis using video camera were performed to identify ergonomic risk factors associated with musculoskeletal disorders. We used the OWAS, RULA, and REBA methods to quantify the risk factors, and the results show that the printing business have high risk of work-related musculoskeletal disorders.

Evaluation of musculoskeletal disorders risk of 119 emergency medical technicians during emergency medical services procedures in firefighter combat challenge (119 구급대원의 근골격계 질환 위험성 평가 - 소방기술경연대회 구급종목을 대상으로 -)

  • Son, Jeong-Won;Park, Jae-Bum
    • The Korean Journal of Emergency Medical Services
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    • v.21 no.3
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    • pp.59-71
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    • 2017
  • Purpose: The purpose of the study was to evaluate the ergonomic risk factors of 119 emergency medical technicians (EMT) with musculoskeletal disorders, performing emergency medical services (EMS) procedures in a firefighter combat challenge. Methods: The evaluated EMT procedures were cardiopulmonary resuscitation (CPR) & intubation, trauma patient assessment, and intravenous (IV) injection. Measurement of working posture was done during training. Results: In CPR & intubation, OWAS-score was 2 (mean 1.9, maximum 4), requiring correction action, while REBA-score was 11 (mean 7.28, maximum 11), requiring immediate improvement. In trauma patient assessment & IV injection, OWAS-score was 4 (mean 2.9, maximum 4), requiring immediate correction action, while the REBA score was 7 (mean 7.5, maximum 11), requiring improvement. Conclusion: Both OWAS score and REBA-score showed improvement of posture and high-risk of musculoskeletal disorders. Occupational health management in EMS procedures during combat challenge and effective injury prevention program in fire stations are warranted.

Comparison of Observational Posture Evaluation Methods based on Maximum Holding Times (최대 지속 시간에 근거한 관찰적 자세 평가 기법의 평가)

  • Moon, Chanyoung;Na, Seokhee;Kee, Dohyung;Chung, Min K.
    • Journal of Korean Institute of Industrial Engineers
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    • v.31 no.4
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    • pp.289-296
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    • 2005
  • This study aims to measure maximum holding times(MHTs) of symmetric and asymmetric whole body postures, and to compare three representative observational methods including OWAS, RULA, REBA, based on the MHTs. An experiment was conducted for obtaining the MHTs, in which hand position was used as experimental variable, and the MHT and subjective discomfort rating as dependent variables. The hand position was defined by the percentage of the shoulder height(%SH), the percentage of the arm reach(%AR) and rotation angle(R). The results showed that three independent variables of %SH, %AR and R significantly affected on the MHTs at ${\alpha}$=0.01, and that the MHTs were negatively linearly related to the discomfort scores of Borg CR10. It was also revealed that OWAS and REBA were less sensitive to postural stress than RULA. In addition, OWAS and REBA underestimated postural load of given postures compared to RULA. Therefore, it is recommended that among the three observational methods investigated in this study, RULA be used for a more precise evaluation of postural load.