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PHYSICAL SYSTEMS: Pak, Hyuk Kyu Telephone : 052-217-5553

  • Profile
    Professor Hyu Kyu Pak is an experimental physicist working on the research areas of soft matter and statistical physics.

    His research interests include
    ► Nonequilibrium Fluctuations (2010 - )
    ► Biological physics (2002 - )
    ► Micro-fluidics (2005 - )
    ► Liquid thin films (1994 - )
    ► Optical studies of complex fluids (1987 - )
    ► Phase transitions and critical phenomena in the bulk and at the interfaces
    of liquids (1987 - )
    ► Nonlinear dynamics and pattern formation in granular systems (1992 - 2003)
    ► Nonlinear dynamical transitions at the onset of turbulence (1987 - 1991)
    ► Nonlinear laser spectroscopy studies of organic molecules (1985 - 1987)


    Short biography of Pak
    ► B.S. in Physics (1985), Pusan National University, Busan, Korea
    ► Ph.D. in Physics (1992), University of Pittsburgh, Pittsburgh, PA
    “Light Scattering Studies of the Transition Region of Weak Turbulence”
    Advisor: Prof. Walter I. Goldburg
    ► Postdoctoral research associate in the Group of Prof. Robert P. Behringer
    Department of Physics, Duke University, NC (1992-1994)
    ► Postdoctoral research associate in the Group of Prof. Bruce M. Law
    Department of Physics, Kansas State University, KS (1994-1995)
    ► Professor in Department of Physics, Pusan National University (1995 - 2014)
    ► Professor in Department of Physics, UNIST (2014 - )
    ► Member of IBS Center for Soft and Living Matter (2014 - )
  • Group achievements

    Selected Publications

    Nonequilibrium Fluctuations for a single-particle analog of gas in a soft wall  
        
    Physical Review Letters (2015) 114, 060603
    Breathing, crawling, budding, and splitting of a liquid droplet under laser heatings
        Soft Matter (2014) 10, 2679-2684
    Electrical power generation by mechanically modulating electrical double layers
        Nature Communications (2013) (
    doi:10.1038/ncomms2485)
    Diffusing-wave spectroscopy study of microscopic dynamics of three-dimensional granular systems
        Soft Matter (2010) 6, 2894-2900
    Thermochemical control of oil droplet motion on a solid substrate
         Applied Physics Letters (2008) 93, 084102
    Dynamics of prey-flock escaping behavior in response to predator’s attack
        Journal of Theoretical Biology (2006) 240, 250-259
    Coarsening Dynamics of Striped Patterns in Thin Granular Layers under Vertical Vibration
         Physical Review Letters (2002) 88, 204303
    Capillary Force on Colloidal Particles in Freely Suspended Liquid Thin Film
         Physical Review Letters (2001) 86, 4326-4329
    Jamming of Granular Flow in a Two-Dimensional Hopper
         Physical Review Letters (2001) 86, 71-74
    Influence of Hydrodynamic flow on Nucleated Wetting
         Journal of Chemical Physics  (1997) 106, 301-310
    2-D Imaging Ellipsometric Microscope
         Review of Scientific Instruments (1995) 66, 4972-4976
    Effects of Ambient Gases on Granular Materials under Vertical Vibration
          Physical Review Letters (1995) 74, 4643-4646
    Bubbling in vertically vibrated granular materials
          Nature (1994) 371, 231-233
    Surface Waves in Vertically Vibrated Granular Materials
         Physical Review Letters (1993) 71, 1832-1835
    Measuring the Probability Distribution of the Relative Velocities in Grid-Generated Turbulence
         Physical Review Letters (1992) 68, 938-942
  • Group research

    Liquid-solid/liquid/soft matter interfaces
    Any piece of matter in nature is bounded by a surface or interface. We study the dynamical phenomena near the interfaces between liquid and solid (or liquid, soft matter) in following aspects.
    (1) Understanding the principles and developing the devices of a micro power generator using the liquid droplet under oscillation
    (2) Understanding the charge distribution near the interfaces
    (3) Understanding the dynamics of micro particles near the interfaces
    (4) Measuring the biological membrane potential using the complex of quantum dots and soft matter



    Nonequilibrium fluctuations
    Most systems in nature are far from equilibrium. According to the second law of thermodynamics, the entropy of an isolated system should tend to increase until it reaches equilibrium. But according to recent studies about the nonequilibrium fluctuations, the second law is only a statistical one, and there is always nonzero possibility that the entropy of an isolated system might spontaneously decrease. As the size of the systems in interest becomes small, this unusual property becomes apparent.
    Currently we are studying the motion of a colloidal particles in an optical trap with a time-varying stiffness. This system can be compared with a heat engine which usually uses a piston to compress and decompress a macroscopic gas, for which temperature, volume and pressure are all well-defined. But our system is one particle gas driven out of equilibrium and the volume where the particle moves around id determined by the optical harmonic potential generated from an external laser light.

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