Article History
Received: 23 December 2018
Accepted: 10 July 2019
First Online: 9 August 2019
Competing interests
: The Institute of Automation, Chinese Academy of Sciences has submitted patent applications on the OWM algorithm (application no. PCT/CN2019/083355; invented by Y.C., G.Z. and S.Y.; pending) and the CDP module (application no. PCT/CN2019/083356; invented by G.Z., Y.C. and S.Y.; pending).