Devices that provide hearing protection, situational awareness, and radio communications are often referred to as Communications and Hearing Protection Systems (C & HPSs). Soldiers use these systems while deployed to navigate within their environment, communicate with their team members, and protect their hearing. Each of the three features of select C & HPSs (hearing protection, speech communication, and situational awareness) was evaluated by the...

Some fundamental objects in practical documents have not been implemented in software so that they can be used easily for calculation. One such object is the graph. A survey of practical graphs found in a variety of real-world documents reveals that many of their useful features are not captured in software. I describe the salient characteristics and features of graphs and propose data structures and computer representations for graph objects. Through...