| Summary: | 碩士 === 逢甲大學 === 工業工程學所 === 91 === With fast computer-related hardware development, the design of VDT has been focused on large size and high resolution. Furthermore, inputting data or controlling computer using GUI with input devices under Windows operation system is totally different from that just using keyboard as main input device under DOS. It points out the importance of adjusting the accuracy of mouse. Issues about computer mouse are wildly discussed including from either ergonomics aspect or HCI aspect. Studies indicated that target size, target amplitude, direction of movement, C/R ratio, trajectory of cursor, angle biased, and so on are the main factors that effect the moving speed and positioning accuracy of computer mouse. Although Windows OS does set the C/R ratio of mouse dynamically, fine adjust time, however, determines the total operation time (including travel and adjust time), setting C/R ratio base on the traveling or adjusting status of mouse probably will be a better design. Although issues about computer mouse are wildly discussed, none of them focused on dynamic C/R ratio. This study is to investigate the effects of dynamic C/R ratio control on mouse positioning performance for windows tasks
Experiments consisted of two parts. Experiment one is a preliminary experiment which focused on typical positioning task (moving mouse to close a specific window). Factors considered include target amplitude, direction of movement, and thresholds for acceleration of mouse. The dependent variables are movement time and displacement. The results showed that different target amplitude, direction of movement, and thresholds for acceleration of mouse had significant effect on the movement and displacement of computer mouse and user-defined threshold is better than Windows built-in threshold. Base on the results of preliminary experiment, the second part of experiment focused on all kinds of movement of mouse under Windows operation system. The program written in VB 6.0 collected all the data about mouse (move, click, double click, drag, and so on) by background executing the program and then analyzed the performance of mouse after dropped useless actions (meaningless, movement takes to long, and so on). Factors considers include target amplitude (9 levels), direction of movement (8 levels), and thresholds for acceleration of mouse (built-in and user defined). Take 0~100 pixels as level 1 for target amplitude and so forth and divide 360 degree into 8 levels for direction of movement. The dependent variable is movement time. The results indicated that user- defined threshold is better than that which is Windows built-in.
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