Figure 15.
(a) Cursor movement tracking on the virtual keyboard developed by OptiKey [56] and (b) signals provided by the PDA on both axes of the coordinate system during typing a sentence.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.