Analytical Algorithms for Ergonomic Seated Posture When Working with Notebook Computers

  • Jalil, Sakib (Engineering Management Program Sirindhorn International Institute of Technology, Thammasat University) ;
  • Nanthavanij, Suebsak (Engineering Management Program Sirindhorn International Institute of Technology, Thammasat University)
  • Published : 2007.12.31

Abstract

This paper discusses two algorithms for recommending notebook computer (NBC) and workstation adjustments so that the user can assume an ergonomic seated posture during NBC operation. Required input data are the user's anthropometric data and physical dimensions of the NBC and the workstation. The first algorithm is based on an assumption that there are no workstation constraints while the second algorithm considers the actual seat height and work surface height. The results from the algorithms include recommendations for adjusting the NBC (tilt angle of the NBC base unit, angle between the base and screen units, and base support height) and the workstation (heights of seat support and footrest, and distance between the body and the NBC).

Keywords

References

  1. Harris, C. and Straker, L. (2000), Survey of physical ergonomics issues associated with school children's use of laptop computers, International Journal of Industrial Ergonomics, 26, 337-346. https://doi.org/10.1016/S0169-8141(00)00009-3
  2. Horikawa, M. (2001), Effect of visual display terminal height on the trapezius muscle hardness: quantitative evaluation by a newly developed muscle hardness meter, Applied Ergonomics, 32, 473-478. https://doi.org/10.1016/S0003-6870(01)00026-6
  3. Kadefors, R. and Laubli, T. (2002), Muscular disorders in computer users: introduction, International Journal of Industrial Ergonomics, 30, 203-210. https://doi.org/10.1016/S0169-8141(02)00125-7
  4. Lueder, R. (1996), A proposed RULA for computer users, Proceedings of the Ergonomics Summer Workshop, San Francisco, USA.
  5. McAtamney, L. and Corlett, E. N. (1993), RULA: a survey method for the investigation of work-related upper limb disorders, Applied Ergonomics, 24(2), 91-99. https://doi.org/10.1016/0003-6870(93)90080-S
  6. Moffet, H., Hagberg, M., Hansson-Risberg, E., and Kalrqvist, L. (2002), Influence of laptop computer design and working position on physical exposure variables, Clinical Biomechanics, 17(5), 368-375. https://doi.org/10.1016/S0021-9290(02)00062-3
  7. Rurkhamet, B. and Nanthavanij, S. (2004a), Analytical design methodology for recommending VDT workstation settings and computer accessories layout, Industrial Engineering and Management Systems, 3(2), 149-159.
  8. Rurkhamet, B. and Nanthavanij, S. (2004b), Analytic and rule-based decision support tool for VDT workstation adjustment and computer accessories arrangement, Journal of Human Ergology, 33, 1-17.
  9. Saito, S., Miyao, M., Konto, T., Sakakibara, H., and Toyoshima, H. (1997), Ergonomic evaluation of working posture of VDT operation using personal computer with flat panel display, Industrial Health, 35(2), 264-270. https://doi.org/10.2486/indhealth.35.264
  10. Sommerich, C. M., Starr, H., Smith, C. A., and Shivers, C. (2002), Effects of notebook computer configuration and task on user biomechanics, productivity, and comfort, International Journal of Industrial Ergonomics, 30, 7-31. https://doi.org/10.1016/S0169-8141(02)00075-6
  11. Stammerjohn, L. W., Smith, M. J., and Cohen, B. F. G. (1981), Evaluation of workstation design factors in VDT operations, Human Factors, 23, 401-412. https://doi.org/10.1177/001872088102300403
  12. Straker, L., Jones, K. J., and Miler, J. (1997a), A comparison of the postures assumed when using laptop computers and desktop computers, Applied Ergonomics, 28, 263-268. https://doi.org/10.1016/S0003-6870(96)00073-7
  13. Straker, L., Pollock, C. M., and Mangharam, J. E. (1997b), The effect of shoulder posture on performance, discomfort and muscle fatigue whilst working on a visual display unit, International Journal of Industrial Ergonomics, 20, 1-10. https://doi.org/10.1016/S0169-8141(96)00027-3
  14. Straker, L., Pollock, C. M., and Limerick, R. B. (2006), Towards evidence-based guidelines for wise use of computers by children, International Journal of Industrial Ergonomics, 36, 1045-1053. https://doi.org/10.1016/j.ergon.2006.09.006
  15. Szeto, G. P. and Lee, R. (2002), An ergonomic evaluation of desktop, notebook and subnotebook computers, Archives of Physical Medicine and Rehabilitation, 83(4), 527-532. https://doi.org/10.1053/apmr.2002.30627
  16. Thai Industrial Standards Institute (2001), Report of the Survey and Research on the Anthropometric Data of Thai Population, Ministry of Industry, Thailand.
  17. The Human Factors Society (1988), American National Standard for Human Factors Engineering of VisualDisplay Terminal Workstations (ANSI/HFS 100-1988), Santa Monica, USA.