1. Human Engineering Evaluation of Street Cleaners’ MSDs Symptoms

2. Reason of subject selection The aim of project Survey from Street cleaners about MSDs Posture analysis of RULA Improvements Gantt chart Q & A

3. Reason for subject selection  Street cleaners work in a poor environment and they have MSDs symptoms because of repetitive work, rack of tools and work overload.  We will analyze the posture and will suggest how to reduce MSDs symptoms.

4.  Human Engineering Evaluation of Street Cleaners’ MSDs Symptoms  Way to reduce overloading of the amount of work  Preventive management of MSDs

5. About MSDs M usculoskeletal disorders (MSDs) are injuries or pain in the body's joints, ligaments, muscles, nerves, tendons, and structures that support limbs, neck and back. MSDs can arise from a sudden exertion, or they can arise from making the same motions repeatedly repetitive strain, or from repeated exposure to force, vibr ation, or awkward posture. E xamples carpal tunnel syndrome Low back pain Tension Neck Syndrome

6. Survey from street cleaners Place : Seoul Ages : All ages Respondents : Street cleaners from Seoul Total : 299

7. Survey from street cleaners Ages Years of service The highest ratio group of ages are 50s by 51%, people who have been working for 10years are 62%

8. Survey from street cleaners More than half of workers have physical pain.

9. Survey from street cleaners

10. Posture analysis of RULA

11. Table A An action of picking garbage up upper arm lower arm wrist posture score 1234 wrist twist 12121212 1 112222333 222223333 323333344 2 123333444 233333444 334444455 3 133444455 234444455 344444555 4 144444555 244444555 344455566 Score A

12. Table B unbalanced posture : +2points Neck posture score trunk posture score 123456 legs 121212121212 1132334556677 2232345556777 3333445566777 4555667777788 5777778888888 6888889999999 Score B An action of picking garbage up

13. Table C 1234567+ 11233455 22234455 33334456 43334566 54445677 64456677 75566777 85567777 Score C Score D Score B (6) + Muscle (1) + Force (0) = Score D (7) Score A (4) + Muscle (1) + Force (0) = Score C (5) Grand Score (7) =Action Level 4

14. Total RULA System Wrist twist Wrist Lower arm Upper arm Legs Trunk Neck A B Muscular use Power ++ ++ Score C = = Posture score by using graph A Power Use score Action level Score D Muscular use Posture score by using graph B Posture score by using graph C 3 2 3 1 3 4 2 6 4 1 1 0 0 5 7 7 4

15. Action level # The requirements for action into which the grand scores are divided is summarized into Action levels as follows. Action level 1 : A score of 1 or 2 indicates that posture is acceptable If it is not maintained or repeated for long periods. Action level 2 : A score of 3 or 4 indicates that further investigation is needed and changes may be required. Action level 3 : A score of 5 or 6 indicates that investigation and changes are required soon. Action level 4 : A score of 7 indicates that investigation and changes are required immediately. Need to improve

16. Improvements

17. Improvement - 1

18. Neck posture score trunk posture score 123456 legs 121212121212 1132334556677 2232345556777 3333445566777 4555667777788 5777778888888 6888889999999 Improved score B

19. Improvement - 1 1234567+ 11233455 22234455 33334456 43334566 54445677 64456677 75566777 85567777 Score C Score D Score B (3) + Muscle (1) + Force (0) = Score D (4) Score A (4) + Muscle (1) + Force (0) = Score C (5) Improved grand Score (4) =Action Level 2

20. Improvement – 2

21. Improvement - 3

22. Improvement - 4

23. Gantt chart 1주1주 2주2주 3주3주 4주4주 5주5주 6주6주 7주7주 8주8주 9주9주 10 주 11 주 12 주 13 주 14 주 Organizing team Theme selection Symptom Survey on MSDs work measurement interim report Data analysis and evaluation Improvement Final report