隨科技發展，輸入裝置已從傳統滑鼠演變為現今非接觸輸入裝置，不僅空間自由度大增，也因為直覺式操作，在過去研究中皆有良好學習性。然而使用性分析研究中，仍屬傳統滑鼠有最佳績效。使用性分析的方法有許多，本研究針對操作姿勢及介面形式(包含選單設計與卷軸滾動方向)之績效(移動時間與錯誤次數)評估，並於測試時收集受測者操作手臂之表面肌電信號，進行疲勞分析。更在每次實驗後，進行主觀評量，除作為生理變量的補充，也做全面的使用性評估。
本研究透過Leap Motion為非接觸輸入裝置，對10位男性受測者之數據經分析，發現操作姿勢與卷軸滾動形式具顯著差異。手臂平舉的互動方式雖有較高疲勞度，但整體績效卻顯著優異。介面形式則推薦環狀選單與垂直卷軸滾動為設計方針。本研究也從交互作用中發現，操作姿勢對於垂直軸向誤差影響較大，另一方面，於本實驗數據，疲勞對於績效並非負相關，而是有較高疲勞度之操作姿勢具有較高績效。未來研究可朝向操作姿勢或利用程式編寫校正偏差，期望能有更佳的整體使用性，再者，虛擬實境(VR)與擴增實境(AR)近兩年迅速普及，對於非接觸裝置三維(3D)介面的開發與設計，也是可期的研究方向。

As technology advances, input devices has also slowly evolved from a traditional mouse into touchless devices. This is due to more spatial freedom and intuitive operation that has been shown in previous studies to have good learnability, however, traditional mouse still performs the best in terms of usability. This study focuses on operational posture as well as effectiveness of interface designs (including menu selection design and scroll direction). Movement time and error rate will be recorded and used for analysis in this study along with EMG data from the arm muscles of the participants with the former being used to measure and analyze fatigue experienced by the participants.
This study uses Leap Motion as the touchless input device, and 10 male participants and found that there was a significant discrepancy between scrolling directions and operation posture. When participants’ arms were lifted while operating the device, their fatigue level increased, however this posture shows better performance. As for interface design, radial menu and vertical scrolls show better results and thus can be used as design guideline. It was also found in this study that the operational posture has a greater impact on vertical scroll errors. On the other hand, in the experiment data, it shows that fatigue is not negatively correlated with performance, the posture that yields higher fatigue produces better results.
A further research can be regarding the posture and using adjustments on the code to compensate for the errors. Also, with the rapid expansion and spread of AR and VR in the past few years, it is possible that we will see more research regarding touchless device utilized in 3D interface designs, thus prompting further research to be done this way.

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