Purdue doctoral student Albert Kim, right, wears a smartphone modified so that it can be used to measure a person’s walking gait. This is to prevent falls in people with compromised balance, such as the elderly or those with Parkinson’s disease. Looking on is Babak Ziaie, a professor in the School of Electrical and Computer Engineering and Weldon School of Biomedical Engineering (Credit: Purdue University/Mark Simons)

The system records a person’s gait by measuring the distance between colored “foot markers” attached to the tip of each shoe. (Credit: Purdue University/Mark Simons)

Read: Smartphone Adapted to Measure Person’s Gait, Reduce Falls