# Work Performance Comparison of Holding and Using Tablet

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3 , March 12-14, 2014, Hong Kong TABLE II RESULTS OF LINEAR REGRESSION EQUATION, R-SQUARE (R 2 ) AND INDEX OF PERFORMANCE (IP) FOR DRAGGING BY FINGER AND DIGITAL PEN WHICH COMPARING BETWEEN SHORT TIME (~10 MINS.) AND LONG TIME (~30 MINS.) Input device Holding for short time Linear Regression Y = bx + a R 2 IP=1/b Holding for long time Linear Regression Y = bx + a Put on the table (TB) y = x R 2 IP=1/b Finger Clipboard (CB) y = x y = x Flat hand (FH) y = x y = x Thumb Extended with Thenar Support (TE) y = x y = x Put on the table (TB) y = x Digital pen Clipboard (CB) y = x y = x Flat hand (FH) y = x y = x Thumb Extended with Thenar Support (TE) y = x y = x As Table II illustrated, it is showing the relationship between the mean movement time and the Index of Difficulty (ID) as performed dragging task by finger for short time (~10 mins.) and long time (~30 mins.). The Index of Performance (IP, defined as 1/b) of TE is highest among the studied postures. Moreover, the Mean Movement Time (Y-interception, defined as a) of TE is also lowest. These results mean that TE is the most effective posture while TB, CB, and FH return the likely results to each other for short time tablet usage as displayed in Table II. Meanwhile, for long time tablet using, with three different holding postures, TE gives higher IP than CB and FH, respectively. From Table III, this study collected the movement times of doing task (dragging) in specified condition. The results show the similarity among the studies over various postures and IDs. The longer period of holding a tablet leads the higher value of Standard Deviation (SD). It means that the accuracy of doing task is dropped as the tablet is held for longer period. This is the effect of fatigue that results in the deviation of moving time when doing task (dragging). TABLE III COMPARISON OF MEAN STANDARD DEVIATION FOR DRAGGING BY FINGER BETWEEN HOLDING FOR SHORT TIME AND LONG TIME Put on the table (TB) Clipboard (CB) Flat hand (FH) Thumb Extended with Thenar Support (TE) Index of Difficulty (ID) Mean Standard deviation (SD) SD Holding for short time SD' Holding for long time SD ( SD= SD'-SD) SD trend Increase Increase Increase Increase Increase Increase Increase Increase Increase Fig. 3. Pointing task for drag by finger while holding for short time As shown in Fig. 3, the graph delivers the deviation of movement time used to do the task versus various IDs. It is found that Thumb Extended with Thenar Support (TE) is the most precise posture as the lowest value of SD is come out along increasing of ID. Nevertheless, the results of doing the task by put the tablet on the table do not show the better performance over any other postures.

4 , March 12-14, 2014, Hong Kong Fig. 4. Pointing task for drag by finger while holding for long time Fig. 5. Pointing task for drag by digital pen while holding for long time Fig. 4 is illustrating the results of doing task while holding the tablet for long. It is shown that the SD of Flat hand (FH) posture is smallest at ID of 3.14, while, Thumb Extended with Thenar Support (TE) results the smallest SD at ID of This is showing that the posture TE is the most precise posture even the tablet is held for short (~10 mins.) or long time. From Fig. 5, it is found that Thumb Extended with Thenar Support (TE) for short time has the smallest deviation (SD) for ID of This means this TE posture is the most stable posture. However, the results of doing the task by put the tablet on the table do not show the better performance over other postures. B. Dragging by digital pen The results of performed dragging task by digital pen for short time (~10 mins.) and long time (~30 mins.) as Table II with all postures and conditions are also alike dragging task by finger that TE has the highest IP and the lowest Movement Time. R-Square value of the analyzed linear regression is more than 0.98 for dragging by digital pen which are essential for application of Steering Law model. Put on the table (TB) Clipboard (CB) Flat hand (FH) Thumb Extended with Thenar Support (TE) Index of Difficulty (ID) TABLE IV COMPARISON OF MEAN STANDARD DEVIATION FOR DRAGGING BY DIGITAL PEN BETWEEN HOLDING FOR SHORT TIME AND LONG TIME Mean Standard deviation (SD) SD Holding for short time SD' Holding for long time SD ( SD= SD'-SD) SD trend Increase Increase Decrease Increase Decrease , Increase Increase Increase Increase From Table IV, the results are showing that the using of Digital pen leads the SD of this result to be larger when the duration of holding tablet is longer. Fig. 6. Pointing task for drag by digital pen while holding for long time As shown in Fig. 6, Thumb Extended with Thenar Support (TE) also delivers the smallest SD value even the tablet is held for long time (30 mins). This result is similar for ID of 3.14 and ID IV. DISCUSSION AND CONCLUSION From this study, it has found 4 main conclusions. First, Thumb Extended with Thenar Support (TE) is the highest posture stability which implies the highest of data Index of Performance and the smallest of data deviation. This high stability comes from the position of a thumb and fingers of TE can tightly hold a tablet. And, TE also provides the proper display position for user. Meanwhile, Clipboard Grip (CB) is not flexible enough for user to adjust a tablet s position. For the Flat Hand (FH), the holding stability is not so good. So, the SD of FH is a bit larger than TE. Therefore, Thumb Extended with Thenar Support (TE) is recommended for using a computer tablet as its stability and performance on both short-holding and longholding. Despite this posture has several advantages in terms of wrist positioning, it requires strength to support digit opposition [6].

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