
479Chapter twenty-one: Using Six Sigma to evaluate radio frequency technologies at NASA
registers that 36 razors have been used and need to be replenished during the next
launch (Figure 21.4).
21.6.4 Sensor active tag
The sensor active tag (SAT) system has the potential to be the ideal inventory management
system for ISS. The key function of the SAT system is that it can query consumables on
board the ISS on a regular schedule as well as locate items on board the ISS. These audits
can keep the ground crew constantly aware of what items are being used on a daily basis.
Figure 21.3 Door antennae placement.
Tags
Figure 21.4 Waste tracking s