Algorithm 1 Cloud-based Data Analysis

Inputs: ya, yb, α, β, $x_a^{\delta }$, $x_b^{\delta }$ Output: Event code (0, 1, 2) Normalize all the time series so that all time series y and xb have a value between 0 and 1, inclusive. Normalize xa based on the maximum distance expected between the sensor and the user. Calculate DTW alignment cost between yb, xb event = 0 if cost(yb, ) < α and $\overline{ x_a^{\delta }}$ < β, then  event = 1 else if cost(yb, $x_b^{\delta }$) < α and $\overline{x_a^{\delta }}$ > β, then  event = 2