Size

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Size

We have experimented with three different types of sizes. Figures 5-7 show the additional energy for benchmark Size. They also show the equation for the best-fit line, obtained through linear regression. The relationship between the size and additional energy is approximately linear. Each letter consumes about 12 EUs. Each new menu item consumes about 220 EUs. These data suggest that GUI designs should be economical to be energy-efficient. Moreover, the huge constants in the linear regression equations also imply that if a user needs to view a large number of items, putting them in as few windows as possible saves significant energy.

**Figure 5:** Additional energy for showing texts of different sizes.
$\begin{figure} \centering\epsfig{file=drawtext.eps,width=3in} \end{figure}$

**Figure 6:** Additional energy for showing menu windows containing different numbers of items.
$\begin{figure} \centering\epsfig{file=menu.eps,width=3in} \end{figure}$

**Figure 7:** Additional energy for showing windows of different sizes.
$\begin{figure} \centering\epsfig{file=showwindow.eps,width=3in} \end{figure}$

Lin Zhong 2003-10-13