(1) "Thermal Entanglement and Thermal Discord in two-qubit Heisenberg XYZ Chain with Dzyaloshinskii-Moriya

      Interactions" , Quantum Information Processing, 18 (2019) 172.
                         DaeKil Park,    final.pdf  arXiv:1901.06165 (quan-ph)

(2) "Dynamics of Entanglement in Three Coupled Harmonic Oscillator System with Arbitrary Time-Dependent

      Frequecy and Coupling Constants", Quantum Information Processing, 18 (2019) 282.

                                DaeKil Park,      trifinal.pdf   arXiv:1811.06256 (quant-ph)

(3) "Thermal Entanglement Phase Transition in Coupled Harmonic Oscillators with Arbitrary

     Time-Dependent Frequencies", submitted to Quantum Information Processing  

               DaeKil Park,  timedep.pdf   arXiv:1903.03297 (quant-ph)