本研究運用人因工程改善技術，整合人因工程原則應用於開發鍵盤操作視覺輔助軟體與工具機配線作業輔助椅來改善電腦輸入與工具機配線等靜態-半靜態作業，後續並分別對兩種作業的改善結果進行效益評估，驗證人因工程改善技術應用於靜態-半靜態作業的可行性。
電腦輸入作業之改善分為三階段進行。第一階段使用加速度規與資料記錄裝置，開發電腦作業人員頭/頸/軀幹動作姿勢之量化評估系統，並配合問卷與工作調查收集相關痠痛抱怨資料，比較14名文書工作者及11名未受打字訓練者之痠痛抱怨與頭/頸/軀幹動作姿勢之差異；而第二、三階段評估使用及未使用視覺輔助軟體對打字姿勢及效率之影響。第二階段先透過軟、硬體技術開發鍵盤操作視覺輔助軟體，並結合頭/頸/軀幹動作姿勢評估系統，以15名大學及研究所學生為受測者進行打字評估，第三階段則從第二階段的受測者中徵募6名自願受測者，經過2週簡易訓練後再重複進行打字評估。
研究結果發現，使用視覺輔助軟體可以幫助受測者在不影響工作姿勢下，減少一般打字時頭/頸部的屈曲動作（角度與角速度），尤其是在進行較不熟悉的英文打字狀況下改善程度更為明顯。當受測者以一般習慣方式進行打字，其中、英文打字速度分別比在使用視覺輔助軟體的情況下快約20%與15% （p<0.001），但是使用視覺輔助軟體所造成的打字速度落差，可以經由簡單的學習及適應消除，相較之下透過練習來改善電腦工作姿勢的效果卻相當有限。
工具機配線作業之改善分為二階段進行。第一階段以AutoCAD進行配線工作椅設計，後續應用JACK軟體以人體模型模擬配線作業之工作姿勢，以進行設計修改。第二階段以12名大學生為受測者進行配線作業實驗評估，比較使用與未使用手臂支撐輔助時肌肉活動電位（EMG）及主觀知覺施力調查之差異，藉此評估使用新式配線工作椅之作業負荷是否低於傳統座椅。
研究結果顯示使用新設計配線椅時，前三角肌與上斜方肌之EMG和肩頸、肘腕部位之主觀施力皆低於傳統用椅；背直肌EMG會隨作業高度的降低而有減少的趨勢；橈側伸腕肌則是明顯受到使用工具的影響。
本研究證實人因工程改善技術應用於靜態-半靜態作業的可行性，使用視覺輔助軟體可以在不損及打字的效率下，明顯地改善電腦使用者打字的不良姿勢與重複低頭動作，而配線工作椅能在適當的高度範圍內提供手臂支撐，降低配線作業時肩頸肌肉的負荷，但手臂支撐的使用可能會限制部分工作姿勢與肌群之施力。

This study explores the feasibility of using ergonomic principles and intervention techniques to reduce the workload of quasi-static tasks such as computer keyboarding and CNC controller wiring. This study developed a visual aid device and an auxiliary chair to improve the computer keyboarding tasks and CNC controller wiring tasks, respectively. The effectiveness and improvement of the two operations were evaluated by laboratory experiments.
The study of improving computer keyboarding is divided into three stages. In the first stage of study, researchers integrated digital accelerometers and data acquisition devices to develop a system for quantifying VDT workers’ head-neck posture and movement. The derived quantitative data were analyzed together with subjects’ perceived discomfort to show the relation between neck-shoulder pain and head-neck posture and movement among 14 university administrators and 11 graduates who have not received typing training. In the second and third stages of study, researchers designed visual aid software and utilized the posture evaluation system to assess the effect of the aid software use on typing posture and efficiency. Participants in the second stage were 15 volunteered university students. Six among them volunteered to join the third stage study and went through a two-week practice before reassessment.
Result of the research showed the use of visual aids software could help participants reduce their head-neck flexion (angle and angular velocity) without affecting their working posture while typing, especially in their unfamiliar English typing tasks. Typing with general customary manner, the participants’ typing speed was about 15% to 20% faster than that with visual aids software (p <0.001). However, the typing speed gap caused by the use of visual aids software could be removed by simple exercises. Nevertheless, using visual aids has a stronger effect than typing exercises on correcting the computer work posture.
The study of improving CNC controller wiring task is divided into two stages. In the first stage of study, the auxiliary chair design was carried out with AutoCAD, and the JACK software was used to simulate various working postures of the wiring work with digital human body model to carry out design modification.In the second stage of study, the efficacy of the proposed chair use was evaluated by 12 healthy males. Their electromyography and perceived exertions when working with and without the use of arm support were compared to justify if the proposed chair can outperform a traditional chair.
Experimental results show the use of arm support significantly reduce EMG in anterior deltoid and upper trapezius muscles, and perceived exertions in wrist, elbow, and neck and shoulder regions. The erector EMG decreases with decreasing work height. The tool used significantly affects EMG in extensor carpi radialis longus and brevis.
This study confirms the feasibility of applying ergonomic techniques in reducing workload of quasi-static tasks. The use of visual aid device can significantly improve the poor posture and repeated bowing movements of computer users without compromising the efficiency of typing. Also, the proposed auxiliary chair provides arm support at an appropriate height tolessen muscle workload in neck and shoulder muscles within a proper range of work height. However, the use of arm support may restrict certain working postures and force generation of upper extremity muscles.

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