Paper

2024

S. Kim, D. K. Sohn, H. S. Ko. Numerical study on piezoelectric inkjet with liquid compressibility. Physics of Fluids, 2024; 36(7), 072008

J. H. Chung, K. H. Kim, D. K. Sohn, H. S. Ko. Numerical study on staggered needle-plate electrode configuration for improved particulate matter collection in electrostatic precipitator. Powder Technology, 2024; 119865.

J. H. Chung, D. K. Sohn, H. S. Ko. Heat transfer enhancement of electrohydrodynamic (EHD) cooling system with magnetic field. Journal of Mechanical Science and Technology, 2024; 38(8). 1-11.

S.W. Hyun, S. Kim, H. Jeong, H. S. Ko, D. H. Shin. Development of snow removal system using embedded piped inside road with solar thermal energy collector and packed bed latent heat thermal energy storage. Journal of Energy Storage, 2024; 83, 110737.

Y. Y. Ji, D. K. Sohn, H. S. Ko. The effect of baffles on vertical wall PCM to enhance natural convection. International Journal of Heat and Mass Transfer, 2024; 125187.

2023

J. H. Chung, D. K. Sohn, H. S. Ko. Study on the Influence of Central Hole Diameter in a Wire Mesh Electrode on Ionic Wind Characteristics. Micromachines, 2023; 14(8), 1614.

S. H. Choi, D. K. Sohn, H. S. Ko. Experimental study on PVT-PCM system performance using bubble-driven flow. International Communications in Heat and Mass Transfer, 2023; 146, 106919.

S. H. Choi, D. K. Sohn, H. S. Ko. Heat transfer enhancement of latent heat thermal energy storage with nanoparticle by bubble-driven flow. Applied Thermal Engineering, 2023; 120922.

S. Kim, J. H. Choi, D. K. Sohn, H. S. Ko. Printability of inkjet according to supply pressure. Physics of Fluids, 2023; 35(5).

J. H. Chung, S. Kim, D. K. Sohn, H.S. Ko, Ventilation Efficiency According to Tilt Angle to Reduce the Transmission of Infectious Disease in Classroom. Indoor and Built Environment. 2023; 32(4), 763-776.

S. Kim, H. S. Ko, D. H. Shin. Fluid flow and heat transfer characteristics of corona wind in cross-cut finned channel. International Journal of Thermal Sciences,2023; 184, 107962.

2022

S. Kim, H. S. Ko, D. H. Shin. Enhanced performance of algal decomposition of electrolysis under cavitation. Journal of Electroanalytical Chemistry,2022; 920, 116596.

Y. Y. Ji, D. K. Sohn, H. S. Ko. Numerical analysis of nozzle shape effect on fluid motion in LPCVD batch-type furnace. Journal of Mechanical Science and Technology, 2022; 1-9

S. Kim, J. H. Choi, D. K. Sohn, H. S. Ko. The effect of ink supply pressure on piezoelectric inkjet. Micromachines, 2022; 13(4), 615.

J. Ryu, H. S. Ko, H. Kim. Vapor absorption and marangoni flows in evaporating drops. Langmuir, 2022; 38(7), 2185-2191.

S. Kim, H. J. Oh, S. J. Han, H. S. Ko, Y. Shin, D. H. Shin. Development of black-ice removal system with latent heat thermal energy storage and solar thermal collectors. Energy, 2022; 244, 122721.

S. H. Choi, H. S. Ko, D. K. Sohn. Bubble-driven flow enhancement of heat discharge of latent heat thermal energy storage. Energy, 2022; 244, 123168.

J. W. Lee, H. Heo, D. K. Sohn, H. S. Ko. Control of electrohydrodynamic (EHD) flow by secondary electric potential. International Journal of Heat and Mass Transfer, 2022; 186, 122490.

J. W. Lee, H. Heo, D. K. Sohn, H. S. Ko. Analysis and optimization of the electrohydrodynamic (EHD) flow with a wire-to-two-cylinder configuration for convective heat transfer. International Journal of Heat and Mass Transfer, 2022; 182, 121959.

J. W. Lee, H. Heo, D. K. Sohn, H. S. Ko. Experimental and numerical study on bubble behaviour using electrostatic model around wire–mesh sensor. Chemical Engineering Science, 2022; 117170.

2021

S. Kim, D. H. Shin, Y. Jung, H. S. Ko, Y. Shin. Short-period thermal cyclic test device for large volumes of microencapsulated phase change materials using a Venturi injector. Journal of Energy Storage, 2021; 43, 103223.

S. H. Choi, D. K. Sohn, H. S. Ko. Performance enhancement of latent heat thermal energy storage by bubble-driven flow. Applied Energy, 2021; 302, 117520.

J. W. Lee, Y. Y. Ji, D. K. Sohn, H. S. Ko. Enhancement of continuous bubbles by non-thermal plasma for water treatment. Journal of Mechanical Science and Technology, 2021; 35(6), 2503-2511

J. W. Lee, H. Heo, D. K. Sohn, H. S. Ko. Development of a numerical method for multiphase flows using an electrostatic model in a wire-mesh sensor. Engineering Applications of Computational Fluid Mechanics, 2021; 15(1), 344-362.

2020
S. Y. Kim, D. W. Shin, S. G. Kim, K. B, Nam, Q. Hu, T. Kim, Y. H. Gim, H. S. Ko, M. J. Kim, J. B. Yoo. The 100 mm × 100 mm Extreme Ultraviolet Graphite Pellicle: Nano-Pellicle Production Using the Lowest Free Energy at the Graphite–Water Interface. Advanced Materials Interfaces, 2020; 24(7), 2001141.

J. Woo, D. K. Sohn, H. S. Ko. Analysis of Stiffness Effect on Valve Behavior of a Reciprocating Pump Operated by Piezoelectric Elements. Micromachines, 2020;11(10), 894.

J. W. Lee, D. K. Sohn, H. S. Ko. Experimental study on momentum of electrohydrodynamic flow induced by corona discharge in the pin to two cylinders configuration. Journal of Mechanical Science and Technology, 2020;34(9), 3679~3686.

S.H. Choi, J. Park, H. S. Ko, S.W. Karng. Heat penetration reduction through PCM walls via bubble injections in buildings. Energy Conversion and Management, 2020; 221, 113187.

D. Kim, J. W. Lee, R. Song, Y. Gim, H. Kwon, H. S. Ko, J. Lee. Improvement of defogging performance of automobile defroster using vortex generators. Heat and Mass Transfer 2020;56, 2595-2604

S. H. Kang, S. Kim, J. W. Lim, D. K. Sohn, H. S. Ko. Study on fall velocity of continuously ejected micro inkjet droplet. Journal of Mechanical Science and Technology, 2020;34,3311-3315

Y. Gim, D. K. Jang, D. K. Sohn, H. Kim, H. S. Ko. Three-dimensional particle tracking velocimetry using shallow neural network for real-time analysis. Experiments in Fluids, 2020;61(2), 1-8.

S. H. Kang, S. Kim, D. K. Sohn, H. S. Ko. Analysis of drop-on-demand piezo inkjet performance. Physics of Fluids, 2020;32(2), 022007.

J. Woo, D. K. Sohn, H. S. Ko. Performance and Flow Analysis of Small Piezo Pump. Sensors and Actuators A: Physical. 2020;301:111766.

2019
J. W. Lee, D. K. Sohn, H. S. Ko. Study on Bubble Visualization of Gas-Evolving Electrolysis in Forced Convective Electrolyte. Experiments in Fluids. 2019;60(10).

G. Lee, D. K. Sohn, S. H. Seok, H. S. Ko. The Effect of Hole Density Variation in the PECVD Reactor Showerhead on the Deposition of Amorphous Carbon Layer. Vacuum. 2019;163:37-44.

D. H. Shin, Y. Gim, D. K. Sohn, H. S. Ko. Development of Venturi-Tube with Spiral-Shaped Fin for Water Treatment. Journal of Fluids Engineering-Transactions of the ASME. 2019;141(5).

D. H. Shin, D. K. Jang, D. K. Sohn, H. S. Ko. Control of Boundary Layer by Ionic Wind for Heat Transfer. International Journal of Heat and Mass Transfer. 2019;131:189-95.

G. Kang, B. Seong, Y. Gim, H. Lee, H. S. Ko, D. Byun. Hydrogel Film Assembly Process at Droplet Interface with Evaporation Temperature. Advanced Materials Interfaces. 2019;6(7).

J. Woo, D. K. Sohn, H. S. Ko. Experimental Study on Pressure Pulsation in Piezo Driven Reed Valve Pump. Journal of Mechanical Science and Technology. 2019;33(2):661-7.

D. H. Shin, J. Park, S. H. Choi, H. S. Ko, S. W. Karng, Y. Shin. A New Type of Heat Storage System Using the Motion of Phase Change Materials in an Elliptical-Shaped Capsule. Energy Conversion and Management. 2019;182:508-19.

S.H. Kang, H.S. Ko. Analysis of Temperature and Gas Flow Distribution in Chamber with Wafer Batch, Heat Transfer Engineering. 2019, 40:17-18, 1498-1510.

2018
D. H. Shin, D. K. Sohn, H. S. Ko. Analysis of Thermal Flow around Heat Sink with Ionic Wind for High-Power Led. Applied Thermal Engineering. 2018;143:376-84.

D. H. Shin, S. Kim, H. S. Ko, Y. Shin. Performance Enhancement of Heat Recovery from Engine Exhaust Gas Using Corona Wind. Energy Conversion and Management. 2018;173:210-8.

Y. Gim, D. K. Jang, S. H. Choi, G. Kang, B. Seong, D. Byun, D. K. Sohn, H. S. Ko. Experimental Study on Slippery Droplet Dynamics Using Optical Correction Method. Journal of Mechanical Science and Technology. 2018;32(10):4731-6.

D. H. Shin, S. Kim, S. Kim, H. S. Ko, Y. Shin. Development of a Calorific Value Controller Using Bimetal Fin Channel for Pcm Heat Storage. Energy Conversion and Management. 2018;173:508-15.

D. H. Shin, S. H. Baek, H. S. Ko. Analysis of Counter Flow of Corona Wind for Heat Transfer Enhancement. Heat and Mass Transfer. 2018;54(3):841-54.

2017
J. H. Lee, Y. Gim, S. Bae, C. Oh, H. S. Ko, S. Baik, T. S. Oh, J. B. Yoo. Determination of Twisting Angle of Electrospun Nanofiber Bundle for Continuous Electrospinning System. Journal of Applied Polymer Science. 2017;134(48).

Y. Gim, D. H. Shin, D. Y. Moh, H. S. Ko. Development of Limited-View and Three-Dimensional Reconstruction Method for Analysis of Electrohydrodynamic Jetting Behavior. Optics Express. 2017;25(8):9244-51.

2016
S. H. Kang, C. Ryu, H. S. Ko. Analysis of Performance for Centrifugal Steam Compressor. Journal of Mechanical Science and Technology. 2016;30(12):5521-7.

D. H. Shin, S. H. Baek, H. S. Ko. Development of Heat Sink with Ionic Wind for Led Cooling. International Journal of Heat and Mass Transfer. 2016;93:516-28.

J. Woo, N. S. Goo, Y. Z. Li, S. H. Kang, H. S. Ko. A Study on Flow Distribution for Integrated Hybrid Actuator by Analysis of Reed Valve. Journal of Mechanical Science and Technology. 2016;30(5):2069-74.

Y. Gim, H. S. Ko. Development of a Three-Dimensional Correction Method for Optical Distortion of Flow Field inside a Liquid Droplet. Optics Letters. 2016;41(8):1801-4.

J. H. Lee, D. W. Shin, K. B. Nam, Y. H. Gim, H. S. Ko, D. K. Seo, G. H. Lee, Y. H. Kim, S. W. Kim, T. S. Oh, J. B. Yoo. Continuous Bundles of Aligned Electrospun Pan Nano-Fiber Using Electrostatic Spiral Collector and Converging Coil. Polymer. 2016;84:52-8.

2015
S. H. Lee, X. H. Nguyen, Y. Gim, H. S. Ko. Study on Electrohydrodynamic Jetting Performance of Organic Solvents. Journal of Mechanical Science and Technology. 2015;29(11):4767-74.

P. H. Lee, S. W. Lee, S. H. Lim, S. H. Lee, H. S. Ko, S. W. Shin. A Study on Thermal Characteristics of Micro-Scale Grinding Process Using Nanofluid Minimum Quantity Lubrication (Mql). International Journal of Precision Engineering and Manufacturing. 2015;16(9):1899-909.

D. H. Shin, J. S. Yoon, H. S. Ko. Experimental Optimization of Ion Wind Generator with Needle to Parallel Plates for Cooling Device. International Journal of Heat and Mass Transfer. 2015;84:35-45.

X. H. Nguyen, Y. Gim, H. S. Ko. Multifunctional, Three-Dimensional Tomography for Analysis of Eletrectrohydrodynamic Jetting. Optics and Lasers in Engineering. 2015;68:235-43.

2014
Z. Xuan, T. Jin, N. S. Ha, N. S. Goo, T. H. Kim, B. W. Bae, H. S. Ko, K. W. Yoon. Performance of Piezo-Stacks for a Piezoelectric Hybrid Actuator by Experiments. Journal of Intelligent Material Systems and Structures. 2014;25(18):2212-20.

J. H. Cho, N. S. Goo, Z. Xuan, K. W. Yoon, H. S. Ko. Study on Flow Distribution inside Integrated Hybrid Actuator. Journal of Mechanical Science and Technology. 2014;28(9):3583-8.

2013
X. H. Nguyen, S. H. Lee, H. S. Ko. Analysis of Electrohydrodynamic Jetting Behaviors Using Three-Dimensional Shadowgraphic Tomography. Applied Optics. 2013;52(19):4494-504.

S. Hong, C. Ryu, H. S. Ko, T. I. Ohm, J. S. Chae. Process Consideration of Fry-Drying Combined with Steam Compression for Efficient Fuel Production from Sewage Sludge. Applied Energy. 2013;103:468-76.

X. H. Nguyen, S. H. Lee, H. S. Ko. Comparative Study on Basis Functions for Projection Matrix of Three-Dimensional Tomographic Reconstruction for Analysis of Droplet Behavior from Electrohydrodynamic Jet. Applied Optics. 2012;51(24):5834-44.

2012
X. H. Nguyen, B. H. Sung, J. Choi, S. R. Ryoo, H. S. Ko, C. Kim. Study on Heat Transfer Performance for Loop Heat Pipe with Circular Flat Evaporator. International Journal of Heat and Mass Transfer. 2012;55(4):1304-15.

H. S. Ko, S. S. Ahn, H. J. Kim. Measurement of Impinging Butane Flame Using Combined Optical System with Digital Speckle Tomography. Optics and Lasers in Engineering. 2011;49(11):1320-9.

S. H. Lee, S. U. Na, G. Kang, H. S. Ko. Study on Flow Distribution for Room Air Conditioner Using Visualization Technique. Journal of Visualization. 2011;14(3):193-200.

X. H. Hu, X. H. Nguyen, Y. J. Kim, S. H. Lee, H. S. Ko. Numerical Analysis of Onset Voltage for the Control of Droplet from an Electrostatic Nozzle. Progress in Computational Fluid Dynamics. 2011;11(3-4):184-8.

C. Chen, Y. J. Kim, H. S. Ko. Three-Dimensional Tomographic Reconstruction of Unstable Ejection Phenomena of Droplets: For Electrohydrodynamic Jet. Experimental Thermal and Fluid Science. 2011;35(3):433-41.

S. H. Lee, S. U. Na, G. Kang, H. S. Ko. Study on Flow Distribution for Room Air Conditioner Using Visualization Technique. Journal of Visualization. 2011;14(3):193-200.

S. D. Kim, S. H. Baek, T. Y. Kang, S. J. Park, C. Kim, H. S. Ko. Numerical Analysis of Flow Distribution for Combined Weapon System in Environmental Tester. Journal of Mechanical Science and Technology. 2012;26(10):3339-45.

Before 2011
H. S. Ko, Y. J. Kim. Tomographic Reconstruction of Two-Phase Flows. KSME International Journal. 2003;17(4):571-80.

H. S. Ko, K. H. Park, Y. J. Kim. Analysis of Density Distribution for Unsteady Butane Flow Using Three-Dimensional Digital Speckle Tomography. KSME International Journal. 2004;18(7):1213-21.

S. J. Oh, D. H. Chung, H. S. Ko. Analysis of Thermal Distribution for Lcd-Tv Using Infrared Camera. Advanced Nondestructuve Evaluation I, Pts 1 and 2, Proceedings. 2006;321-323:817-20.

Y. J. Kim, S. H. Lee, D. Y. Byun, S. J. Han, J. H. Yang, H. S. Ko, et al. Electrostatic Ejection of Single-Walled Carbon Nanotubes Suspended in Solution. Key Engineering Materials 2006;326–328:321–4.

H. S. Ko, K. Ikeda, M. Ishikawa, K. Okamoto, Y. J. Kim. Experimental Analysis of High-Speed Helium Jet Flow Using Four-Dimensional Digital Speckle Tomography. Experiments in Fluids. 2006;40(3):442-51.

H. S. Ko, Y. J. Kim, O. C. Kwon, K. Okamoto. Analysis of Simultaneous Velocity and Density Distributions for High-Speed CO2 Flow Using Particle Image Velocimetry and Digital Speckle Tomography. Key Engineering Materials 2006;326–328:55–8.

K. Okamoto, Y. J. Kim, H.S. Ko. Development of Digital Speckle Tomography for Analysis of Unsteady and Asymmetric Flows. Solid State Phenomena 2007;120:267–72.

Y. J. Kim, H. S. Ko, S. Lee, S. U. Son, D. Jung, D. Byun. Numerical and Experimental Analysis of Electrostatic Ejection of Liquid Droplets. Journal of the Korean Physical Society. 2007;51:S42-S6.

S. H. Baek, J. Y. Lee, S. J. Park, S. D. Kim, H. S. Ko. A Study on the Design of the Solar Lamp Bank of Metal Halide-Infrared Lamps Combination Method. Journal of Industrial and Engineering Chemistry. 2007;13(7):1122-30.

I. Kang, K. Y. Joung, G. R. Choi, M. J. Schulz, Y. S. Choi, S. H. Hwang, H. S. Ko. The Bulk Piezoresistive Characteristics of Carbon Nanotube Composites for Strain Sensing of Structures. Journal of Nanoscience and Nanotechnology. 2007;7(11):3736-9.

S. Lee, D. Byun, D. Jun, J. Choi, Y. Kim, J. H. Yang, S. U. Son, S. B. Q. Tran, H. S. Ko. Pole-Type Ground Electrode in Nozzle for Electrostatic Field Induced Drop-on-Demand Inkjet Head. Sensors and Actuators a-Physical. 2008;141(2):506-14.

D. Byun, J. Kim, H. S. Ko, H. C. Park. Direct Measurement of Slip Flows in Superhydrophobic Microchannels with Transverse Grooves. Physics of Fluids. 2008;20(11).

J. Choi, Y. J. Kim, S. Lee, S. U. Son, H. S. Ko, V. D. Nguyen, D. Byun. Drop-on-Demand Printing of Conductive Ink by Electrostatic Field Induced Inkjet Head. Applied Physics Letters. 2008;93(19).

Budiono, D. Byun, V. D. Nyugen, J. Kim, H. S. Ko. Free Surface Transition and Momentum Augmentation of Liquid Flow in Micro/Nano-Scale Channels with Hydrophobic and Hydrophilic Surfaces. Journal of Mechanical Science and Technology. 2008;22(12):2554-62.

Y. J. Kim, K. Okamoto, H. S. Ko. Study on Concurrent Measurements of Velocity and Density Distributions for High-Speed Co2 Flow. Journal of Visualization. 2009;12(3):203-15.

V. D. Nguyen, M. G. Schrlau, S. B. Q. Tran, H. H. Bau, H. S. Ko, D. Byun. Fabrication of Nanoscale Nozzle for Electrohydrodynamic (Ehd) Inkjet Head and High Precision Patterning by Drop-on-Demand Operation. Journal of Nanoscience and Nanotechnology. 2009;9(12):7298-302.