Characteristics of a Delayed System with Time-dependent Delay Time
  The characteristics of a time-delayed system with time-dependent delay time is investigated. We demonstrate the nonlinearity characteristics of the time-delayed system are significantly changed depending on the properties of time-dependent delay time and especially that the reconstructed phase trajectory of the system is not collapsed into simple manifold, differently from the delayed system with fixed delay time. We discuss the possibility of a phase space reconstruction and its applications. 
Won-Ho Kye, Muhan Choi, Sunghwan Rim, M.S. Kurdoglyan, Chil-Min Kim,   and Young-Jai Park