控制-顯示增量對遙指作業績效之影響

Abstract

遙指作業和一般傳統的指向作業在本質上有很大的不同。過去的研究顯示作業特性與 使用者特性等因素會影響遙指績效，惟系統設計對搖指績效的影響尚付之闕如。控制器的 控制──顯示增量(C-D gain)為設計指向裝置時常被考量的設計參數。一般輸入設備將C- D gain定義成(1)顯示器和控制器間位置（一階）的對應，和(2)速度（二階）的對應關係 。本研究的目的在探討速度C-D gain、遙指距離、目標尺寸和移動幅度對手部以遙指器執 行間斷型作業績效的影響。 75位交通大學的學生被隨機指派到5（速度C-D gain）×3（遙指距離）個實驗情境之 一，進行以Fitts' Law為基礎4（目標尺寸）×3（移動幅度）個情境的遙指作業。實驗結 果顯示當遙指距離愈長、目標尺寸愈小，點選錯誤率會愈高。高速度C-D gain會造成較短 的作業完成時間和較高的選擇錯誤率，所以最佳速率C-D gain的決定還要視遙指作業特性 而定。速度C-D gain對遙指機制也有顯著的影響，速度C-D gain愈高會使第一副移動時間 愈短，而過高或過低的速度C-D gain皆會使第一副移動速度、調整副移動時間和副移動次 數增加。最後根據實驗結果，提出遙指介面設計原則的建議。

Control-display gain of pointing devices is an important factor in determining the performance effectiveness. The control-display gain (C-D gain ) is usually defined as either the relationship between control displacement and display displacement (i.e., first order) or the relationship between control velocity and display velocity (i.e., second order). The purpose of this study is to investigate the effects of the velocity control-display gain on the performance of discrete remote pointing task based upon hand input device. Seventy-five students of National Chiao Tung University were randomly assigned to one 5 (velocity C-D gain)×3(remote distance) experimental situations to perform cursor positioning tasks by using a remote pointing device. The results showed that velocity C-D gain, movement amplitude, target width, and remote distance had a significant effect on task completion time. In addition, target width and remote distance also had a significant effect on selection error rates. High velocity C-D gain made tasks faster and less accurate. Moreover, the optimal level of velocity C-D gain depended on the characteristics of the task required. Velocity C-D gain also had a significant effect on mechanism of remote pointing. At last, the author offered suggestions for the remote pointing interface design at the end of the paper.