A new application has been developed that alerts teachers when a student is wandering away from the flock. This could help teachers prevent anyone from getting lost.
The new app - RubberBand, uses a sensor attached to each child's knapsack that broadcasts a radio signal to all the other kids' sensors once every second.
The signals are then collected by a smartphone running software that measures the signal strength between every pair of children in the group to determine their locations as compared to each other.
If a child strays away, or a splinter group forms, the system plays a sound to alert the teacher and also displays pictures of the children involved.
"This kind of work is invaluable even if we are able to prevent just one child from going missing," New Scientist quoted Hyukjae Jang at the Korea Advanced Institute of Science and Technology in Daejeon as saying.
The app will be presented at the UbiComp conference in Pittsburgh, Pennsylvania, in September.