本研究目的在於建立一人因握把輔助設計系統，以客製化產生符合特定抓握姿勢的握把造形。首先推導握把截面多項式，該多項式的變數包括手指關節點位置和曲線的曲率值。利用此多項式繪製出握把截面的造形，並結合遺傳演算法的基因編碼與適存函式(fitness function)的設定，演化出最適合使用者的握把造形。
以手工具為例，握把的造形與人因的考量是非常重要的，若長期抓握不適合的握把，容易導致肌肉與手腕的傷害。但是，目前大部分的握把造形設計，僅考量握把的尺寸與製造的方便，較少考量握把曲面特性對使用者的影響。然而，曲面造形設計仰賴設計師的直覺與經驗，設計過程不僅消耗許多時間，更缺乏人因評估的準則。
本研究藉由截面多項式與遺傳演算法，發展一套人因握把輔助設計系統。該系統的功能，主要為自動化衍生新的握把造形，在衍生的過程中導入人因的準則，做為造形最佳化的依據。該輔助系統由Visual C++配合OpenGL函式庫所建立，以提供完整的視覺效果與友善的操作介面。最後，利用此系統設計一人因握把，並以一套人因實驗評估該握把的舒適度。
實驗的項目包括抓握姿勢的測試、問卷調查與肌電量測三大部分。由實驗的結果與分析後可發現，在垂直施力時，使用人因握把較不易造成肌肉疲勞，且用力抓握時，使用人因握把較能分散手掌壓力，避免手掌虎口處過度用力。

The goal of this research is to develop a computer-aided ergonomic handle design system, which produces handle styling by specific grip postures. First of all, establish the cross-section polynomial by means of variables that evolve from positions of the fingers and curvatures of the curves. The appropriate handle styling is presented by the approach combined the cross-section polynomial with setting of fitness function of the real-coded genetic algorithm.
For hand tools, the handle styling and ergonomic considerations are very important. A long-term use of an immoderate handle will cause discomfort, or do harm to wrists and muscles. However, considerations of handle design mostly are about the manufacture and size of handle, and the influence of handle surface characteristics is seldom included. Besides, the handle design procedures rely on the experience and intuition of designers, it would cost much time and lack for evaluations of ergonomic standards.
In this paper, we develop a computer-aided ergonomic handle design system by means of cross-section polynomial and genetic algorithm. According to ergonomic considerations, the primary objective of the system is to create systematic approach, including handle shape design automation and handle shape optimization. Furthermore, the system is programmed by using Visual C++ and OpenGL application programming interface, which provides a thorough rendering environment and user-friendly visual interface. Finally, we design a ergonomic handle by using the system and verify the validity of the handle by experiments.
These experiments include of tests of grip gesture, questionnaires and the measurement of electromyography(EMG). Under vertical working condition, results show that the ergonomical handle eases more muscle fatigue and disperses more pressure on the palm comparing with normal handles.

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【web#1】http://www.iosh.gov.tw/勞工衛生研究所
【web#2】http://www.health.uottawa.ca/biomech/courses/apa4311/biomec~1.htm
【web#3】http://www.rad.washington.edu/atlas/flexorcarpiradialis.html
【web#4】http://www.microsoft.com/taiwan/vstudio/visualc/default.mspx