| 英文摘要 |
The purpose of this study was to develop a sit-stand chair to be used specifically in clean rooms of the semiconductor industry. Previous studies have shown that lower leg fatigue is one of work-related musculoskeletal problems in semi-conductor industry. To tackle this problem, it was proposed that a sitstand chair could be provided as spontaneously short-term body weight support to reduce lower leg fatigue problems during work process. This study proceeded with design and evaluation phases. In the design phase, we began with worker’s task analysis and clean room’s facility layout to come up with design requirements for prototyping. Based on the design requirements, three versions of the prototype chairs were made one after the other through innovation. The innovation was based on lab trial and structure mechanics analysis. In the evaluation phase, four prototype chairs of the final version were made and installed in two clean rooms for two four-week field tests. A total of 32 (4 chairs x 2 shifts x 2 rooms x 2 evaluations) female workers participated in these two tests. The participants were asked to fill out one questionnaire three times, the first was before the test, the second was two weeks after and the third was four weeks after. The questions consisted of degree of fatigue, frequency of use, duration of use, and comments toward design. The results show that the degree of fatigue was 4.7 (before use) decreased to 3.8(after two weeks) and again decreased to 3.1(after four weeks). In contrast, the frequency of use increased from none to 24 times and then increased to 41 times; the duration of use increased from zero to 1.2 minutes and then again increased to 2.8 minutes; and the comments toward design consisted of a wide spectrum of favorable suggestions. In summary, the results show that the chair is capable of reducing lower leg fatigue and is well accepted by the users. |
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