<italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">k</italic>-nearest neighbor 1 Complex working condition Employee welfare 1 Fault detection 1 Fault diagnosis 1 Feature extraction 1 Indexes 1 Power system dynamics 1 Wind turbines 1 dynamic neighborhood scale 1 dynamic threshold 1 fault detection 1 multistep index 1