Publications


  (Corresponding authors asterisked; + Equal contribution)

  1. Level set method for two-phase electrohydrodynamic flows
    H. Ki*
    In preparation, (2017).

  2. Role of the critical point in the laser ablation of materials
    H. Cho and H. Ki*
    In preparation, (2017).

  3. A unified momentum equation approach for fluid-structure interaction problems
    H. Yeo and H. Ki*
    In preparation, (2017).

  4. Investigation of cut quality in fiber laser cutting of CFRP
    S. Oh and H. Ki*
    submitted, (2017).

  5.  Functionally-graded yttria-stabilized zirconia thermal barrier coatings by dual-beam pulsed laser deposition
    C. Deng, H. Kim and H. Ki*
    submitted, (2017).

  6. A unified momentum equation approach for computing thermal residual stresses during melting and solidification
    H. Yeo and H. Ki*
    Computer Physics Communications 224, 230-244, (2018.03). link

  7. A study of keyhole behavior and weldability in zero-gap laser welding of zinc-coated steel sheets at subatmospheric pressures
    J. Kim, S. Oh, M. Son and H. Ki*
    Journal of Materials Processing Technology 249, 135-148, (2017.11). link

  8. Fabrication and optimization of transparent conductive films using laser annealing and picosecond laser patterning
    K. Lee and H. Ki*
    Applied Surface Science 420, 886-895, (2017.10.31). link

  9. Prediction of hardness and deformation using a 3-D thermal analysis in laser hardening of AISI H13 tool steel
    S. Oh and H. Ki*
    Applied Thermal Engineering 121, 951-962, (2017.07) link

  10. A unified momentum equation approach for computing flow-induced stresses in structures with arbitrarily-shaped stationary boundaries
    H. Yeo and H. Ki*
    Communications in Computational Physics 22(1), 39-63, (2017.07) link

  11. Effect of beam size in laser welding of ultra-thin stainless steel foils
    J. Kim+, S. Kim+, K. Kim, W. Jung, D. Youn, J. Lee and H. Ki*
    Journal of Materials Processing Technology 233, 125-134 (2016.07) link

  12. Rapid fabrication of transparent conductive films with controllable sheet resistance on glass substrates by laser annealing of diamond-like carbon films
    K. Lee and H. Ki*
    Acta Materialia 111, 315-320 (2016.06) link

  13. Effect of keyhole geometry and dynamics in zero-gap laser welding of zinc-coated steel sheets
    J. Kim, S. Oh and H. Ki*
    Journal of Materials Processing Technology 232, 131-141 (2016.06) link

  14. Electrodynamic simulation of energy absorption in laser keyhole welding of zinc-coated and uncoated steel sheets
    C. Deng, J. Kim, S. Oh and H. Ki*
    Journal of Materials Processing Technology 231, 412-421 (2016.05) link

  15. Pulsed laser deposition of refractive-index-graded broadband antireflection coatings for silicon solar cells
    C. Deng and H. Ki*
    Solar Energy Materials and Solar Cells 147, 37-45 (2016.04) link

  16. A study of keyhole geometry in laser welding of zinc-coated and uncoated steels using a coaxial observation method
    J. Kim, S. Oh and H. Ki*
    Journal of Materials Processing Technology 225, 451-462 (2015.11) link

  17. Water-assisted pulsed Er:YAG laser interaction with silicon
    J. Kim and H. Ki*
    Journal of Applied Physics 118(1), 018105 (2015.07) link

  18. Controlling thermal deformation using a heat sink in laser transformation hardening of steel sheets
    S. Kim, S. So and H. Ki*
    Journal of Materials Processing Technology 216, 455-462 (2015.02) link

  19. Scaling law for penetration depth in laser welding
    J. Kim and H. Ki*
    Journal of Materials Processing Technology 214(12), 2908-2914 (2014.12) link

  20. Laser transformation hardening of carbon steel sheets using a heat sink
    H. Ki*, S. So and S. Kim
    Journal of Materials Processing Technology 214(11), 2693-2705 (2014.11) link

  21. Effect of film gradient profile on adhesion strength, residual stress and effective hardness of functionally graded diamond-like carbon films
    Y. J. Won and H. Ki*
    Applied Surface Science 311, 775-779 (2014.08.30) link

  22. Finite-difference time-domain simulation of laser beam absorption in fully penetrated keyholes
    C. Deng and H. Ki*
    Journal of Applied Physics 114(16), #164901 (2013.10) link

  23. FDTD method for laser absorption in metals for large scale problems
    C. Deng and H. Ki*
    Optics Express 21(21), 25467-25479 (2013.10) link

  24. Effect of specimen thickness on heat treatability in laser transformation hardening
    S. So and H. Ki*
    International Journal of Heat and Mass Transfer 61, pp. 266-276 (2013.06) link

  25. Fabricating functionally graded films with designed gradient profiles using pulsed laser deposition
    Y. J. Won and H. Ki*
    Journal of Applied Physics 113(17), #174910 (2013.05) link

  26. CO2 and Er:YAG laser interaction with grass tissues
    J. Kim and H. Ki*
    Journal of Applied Physics 113(4), #044902 (2013.01) link

  27. 355, 532, and 1064 nm picosecond laser interaction with grass tissues
    J. Kim and H. Ki*
    Journal of Applied Physics 112(11), #114908 (2012.12) link

  28. Surface modification of the patterned Al6061/SUS304 metal plates using the large electron beam
    D.M. Kim, J. Kim, S.S. Park, H.W. Park and H. Ki
    Applied Surface Science 261, 458-463 (2012.11)

  29. Pocess map for laser heat treatment of carbon steels
    H. Ki* and S. So
    Optics & Laser Technology 44(7), 2106-2114 (2012.10) link

  30. Pulsed laser deposition of functionally gradient diamond-like carbon (DLC) films using a 355 nm picosecond laser 
    H. Cho, S. Kim and H. Ki*
    Acta Materialia 60(18), 6237-6246 (2012.10) link

  31. Lattice Boltzmann simulation of laser interaction with weakly ionized helium plasmas
    H. Li and H. Ki*
    Physical Review E 82, #016703 (2010.07) link

  32. Level set method for two phase incompressible flows under magnetic fields
    H. Ki*
    Computer Physics Communications 181(6), 999-1007 (2010.06) link

  33. On vaporization in laser material interaction
    H. Ki*
    Journal of Applied Physics 107, #104908 (2010.05) link

  34. Computation of flow induced stresses in a structure using a hybrid momentum equation approach
    J. Gattu and H. Ki*
    International Journal of Theoretical and Applied Multiscale Mechanics 1(2), 118-133 (2009)

  35. Lattice Boltzmann simulation of weakly-ionized plasmas and fluid flows using physical properties of fluids
    H. Li and H. Ki*
    Journal of Physics A: Mathematical and Theoretical 42, #155501 (2009) link

  36. Simulation of MHD flows using a hybrid lattice-Boltzmann finite-difference method
    H. Li and H. Ki*
    Communications in Computational Physics 4(2), pp. 337-349 (2008)


  37. Lattice Boltzmann method for weakly ionized isothermal plasmas
    H. Li and H. Ki*
    Physical Review E 76, #066707 (2007)

  38. Effect of ionization on the femtosecond laser pulse interaction with silicon
    H. Li and H. Ki*
    Journal of Applied Physics
     100, #104907 (2006)

  39. Mass removal modes in the laser ablation of silicon by a Q-switched diode-pumped solid-state laser
    D. Lim, H. Ki* and J. Mazumder
    Journal of Physics D: Applied Physics 39, 2624-2635 
    (2006)

  40. Numerical simulation of heat transfer and fluid flow in coaxial laser cladding process for direct metal deposition
    H. Qi, J. Mazumder and H. Ki
    Journal of Applied Physics 100, #024903 
    (2006)

  41. A numerical method for multiphase incompressible thermal flows with solid-liquid and liquid-vapor phase transformations
    H. Ki*, P.S. Mohanty and J. Mazumder
    Numerical Heat Transfer, Part B: Fundamentals 48(2), 125-145 (2005)


  42. Numerical simulation of femtosecond laser interaction with silicon
    H. Ki* and J. Mazumder
    Journal of Laser Applications 17(2), 110-117 (2005)


  43. Modeling of laser keyhole welding – II. Simulation of keyhole evolution, velocity, temperature profile and experimental verification
    H. Ki, P.S. Mohanty and J. Mazumder*
    Metallurgical and Materials Transactions A  33(6), 1831-1842 (2002)

  44. Modeling of laser keyhole welding – I. Mathematical modeling, numerical methodology and role of recoil pressure, multiple reflections, and free surface evolution
    H. Ki, P.S. Mohanty and J. Mazumder*
    Metallurgical and Materials Transactions A 33(6), 1817-1830 (2002)

  45. Multiple reflection and its influence on keyhole evolution
    H. Ki, P.S. Mohanty and J. Mazumder*
    Journal of Laser Applications 14(1), 39-45 (2002)

  46. Modelling of high-density laser-material interaction using fast level set method
    H. Ki, P.S. Mohanty and J. Mazumder*
    Journal of Physics D: Applied Physics 34, 364-372 (2001)





Dr. Ki and his colleagues' work at the University of Michigan was featured in Access Magazine:

Big Kids, Access Magazine (Official Magazine for the National Center for Supercomputing Applications, the University of Illinois), Spring 2002. Also available online at http://access.ncsa.uiuc.edu/Stories/laserkeyhole/