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Byungwook Ahn, Ph.D.

  • SMALL Member: Sep. 2006 - Sep. 2011

Current Position

  • Post-doc (Oct. 2011 - present)

    • Emory University School of Medicine and Georgia Institute of Technology

  • Advisor

    • Wilbur A. Lam, MD, PhD
      Assistant Professor
      Department of Pediatrics
      Aflac Cancer Center and Blood Disorders Service of Children's Healthcare of Atlanta Emory University School of Medicine Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology and Emory University

  • E-mail: lostfangion@gmail.com

  • Web-site: www.SMALL.buffalo.edu/people/byungwook_ahn.html
Education - Ph.D. (February 2007 – Aug. 2011)

  • University at Buffalo, The State University of New York (SUNY at Buffalo)

  • Department of Electrical Engineering

  • Dissertation: Dynamic control of water-in-oil droplets in a continuous flow by active and passive methods.

  • Advisor: Prof. Kwang W. Oh
Education - M.S. (September 2005 – January 2007)

  • University at Buffalo, The State University of New York (SUNY at Buffalo)

  • Department of Electrical Engineering

  • Advisor: Prof. Kwang W. Oh
Education - B.S. (March 1997 – February 2004)

  • Ajou Universitu, Suwon, South Korea

  • Electrical Engineering
Honors and Awards

  • Research Assistantship, 2011, 2010, 2009

  • Teaching Assistantship, 2011, 2010, 2009, 2008, 2007

  • Departmental Award for Graduate Student Research Poster Competition, 2011, Department of Electrical Engineering, University at Buffalo, Buffalo, New York

  • The Mark Diamond Research Fund (MDRF) for graduate students, 2010, University at Buffalo, Buffalo, New York

  • Departmental Award for Graduate Student Research Poster Competition, 2009, Department of Electrical Engineering, University at Buffalo, Buffalo, New York
Research interest

  • Design and analysis of microfluidic system with applications in BioMEMS

  • Single droplet control using electrostatic actuation in microfluidic device

  • Particle encapsulation and sorting in two phase droplet

  • Biological analysis (immunoassay in two phase droplet system)
Research at SMALL

  • Two phase active droplet control (two-phase droplet sorting)

    • Designed and implemented a two-phase sorting device based on electrostatic actuation

    • Studies the parameters including magnitude of actuation voltage and frequency to droplet sorting

    • Realized the single droplet manipulation with actuation frequency

  • Two phase passive droplet control (Synchronization and distribution)

    • Designed and implemented the microfluidic device which could synchronize the position of two droplets in continuous flow microfluidic device

    • Realized two-phase droplet guiding and distribution device regardless of its hydrodynamic resistance value

    • Studied and characterized on the phenomenon as a function of flow rate and droplet size

  • Microfluidic pump using piezo actuator (New scale technologies, Rochester, NY)

    • Developed a small size microfluidic pump using piezo actuator

    • Focused on design and fabrication of microfluidic device which included fluidic channel and valve

  • Micro-particle encapsulation in two-phase droplet

    • Single particle encapsulation using inertia force

    •
Skills Summary

  • Device Fabrication

    • Silicon based micro-fabrication

    • Thick photoresist (SU-8 series) fabrication

    • Operation of metal deposition machines (E-beam evaporator, DC sputter)

    • Oxide deposition machine (PECVD)

    • Wet etching (HF solution) and dry etching (RIE)

    • Oxygen plasma cleaner (PDMS bonding machine)

    • PDMS device fabrication with multiple PDMS layers

    • SEM

  • Computer Skills

    • Microfluidic simulation with COMSOL multiphysics

    • AutoCAD

    • Circuit simulation and calculation using PSpice

    • Maple

    • Microsoft office and origin
Teaching Experience

  • Department of Electrical Engineering
    University at Buffalo (Sep. 2007 – Present)
    Teaching Assistant

    • Assisted faculty in conducting the course

    • Graded homework and exams

    • Conducted office hours and recitation for students

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  • EE 202 Circuit Analysis I (Fall 2008)

  • EE 200 Electrical Engineering Concepts / non-majors (Spring 2009)

  • EE 311 Electronic Devices and Circuits II (Spring 2011)

  • EE 448/548 Microelectronic Device Fabrications (Fall 2007)

  • EE 471/571 Sustainable Energy Systems (Spring 2010)

  • EE 480/580 Biomedical Electronics (Fall 2010, Fall 2009)

  • EE 547 Microlithography (Spring 2008)
Publications - Journals

  • Byungwook Ahn, Kangsun Lee, Hun Lee, Rajagopal Panchapakesan, and Kwang W. Oh, "Parallel synchronization of two trains of droplets using a railroad-like channel network," Lab Chip, in publication, 2011

  • Byungwook Ahn, Kangsun Lee, Hun Lee, Rajagopal Panchapakesan, Linfeng Xu, Jing Xu, and Kwang W. Oh, " Guiding, distribution, and storage of trains of shape-dependent droplets," Lab chip, in publication, 2011

  • Byungwook Ahn, Kangsun Lee, Rajagopal Panchapakesan, and Kwang W. Oh ��On-demand electrostatic droplet charging and sorting��, Biomicrofluidics, 5, 024113, 2011

  • Byungwook Ahn, Kangsun Lee, Romain Louge, and Kwang W. Oh, "Concurrent droplet charging and sorting by electrostatic actuation", Biomicrofluidics, 3, 044102, 2009

  • Kangsun Lee, Choong Kim, Byungwook Ahn, Rajagopal Panchapakesan, Anthony R. Full, Ledum Nordee, Ji Yoon Kang, and Kwang W. Oh, "Generalized serial dilution module for monotonic and arbitrary microfluidic gradient generators", Lab Chip, 9, 709 – 717, 2009

  • Kangsun Lee, Choong Kim, Byungwook Ahn, Ji Yoon Kang, and Kwang W. Oh, "Hydrodynamically Focused Particle Filtration Using An Island Structure", Biochip Journal, 3, 275 – 280, 2009

  • Kangsun Lee, Choong Kim, Youngeun Kim, Keunhui Jung, Byungwook Ahn, Ji Yoon Kang, and Kwang W. Oh, "2-layer based microfluidic concentration generator by hybrid serial and volumetric dilutions", Biomedical Microdevices, 12, 297 – 309, 2010

  • K. Lee, C. Kim, Y. Kim, Byungwook Ahn, R. Panchapakesan, J. Bang, J. Kim, Y. K. Yoon, J. Y. Kang, and K. W. Oh, "Microfluidic concentration-on-demand combinatorial dilutions," Microfluid Nanofluid, 2011.
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Publications - Conferences/Workshops

  • Byungwook Ahn, Kangsun Lee, Rajagopal Panchapakesan, Hun Lee, Linfeng Xu, Jing Xu, and Kwang W. Oh, ��Guiding and Distribution of a Train of Droplets Employing Side Flows and Guiding Tracks��, Proc. in MicroTAS 2011.

  • Byungwook Ahn, Kangsun Lee, Hun Lee, Rajagopal Panchapakesan, Linfeng Xu, Jing Xu, and Kwang W. Oh, ��Droplet Synchronization of Two Parallel Trains of Droplets Using a Ladder-like Channel Network��, Proc. in MicroTAS 2011.

  • Jing Xu, Byungwook Ahn, Hun Lee, Kangsun Lee, Rajagopal Panchapakesan, Linfeng Xu, and Kwang. W. Oh, ��Droplet based Microfluidic Device for Multiple Droplet Trapping, Storing and Clustering Employing Guiding Track and Forward/Backward Flow��, Proc. in MicroTAS 2011.

  • Hun Lee, Byungwook Ahn, Kangsun Lee, and Kwang. W. Oh, ��Continuous-Flow in-Droplet Magnetic Particle Separation in a Droplet-Nased Mocrofluidic Platform��, Proc. in MicroTAS 2011.

  • Kangsun Lee, Choong Kim, Byungwook Ahn, Hun Lee, Rajagopal Panchapakesan, Lingfeng Xu, Jing Xu, Ji Woon Kang, and Kwang W. Oh, ��Single-Layer Microfluidic Network-Based Combinatorial Dilution For a Standard Simplex-Lattice Combinatorial Design��, Proc. in MicroTAS 2011.

  • Deepu George, Rohit Singh, Chejin Bae, A. G. Markelz, Byungwook Ahn, Kwang W. Oh, ��THz measurements of molecular solution phase dynamical alignment��, Optical Terahertz Science and Technology 2011.

  • Deepu George, Rohit Singh, Chejin Bae, Byungwook Ahn, Kwang Oh, and A. G. Markelz, "THz measurements of molecular solution phase dynamical alignment," Biophysical Society Annual Meeting 2011.

  • Byungwook Ahn, Kangsun Lee, Rajagopal Panchapakesan, Preethi Gopalan, and Kwang W. Oh, "Robust on-demand electrostatic droplet charging and sorting in a droplet-based microfluidic device", Proc. in MicroTAS 2010.

  • Kangsun Lee, Choong Kim, Youngeun Kim, Jaehoon Bang, Byungwook Ahn, ��JK�� Jungkwun Kim, ��YK�� Yong-Kyu Yoon, Ji Yoon Kang and Kwang W. Oh, "Microfluidic network-based combinatorial dilution device with an initial concentration controller", Proc. in MicroTAS 2010.

  • Kangsun Lee, Choong Kim, Jaehoon Bang, Youngeun Kim, Seungha Lee, Byungwook Ahn, Ji Yoon Kang and Kwang W. Oh, "Gravity-oriented microfluidic device for cell spheroid formation", Proc. in MicroTAS 2010.

  • Preethi Gopalan, Byungwook Ahn, and Kwang W. Oh, "Serial microfluidic device for microdroplet trapping and pairing", Proc. in ASME-IMECE 2010.

  • Kangsun Lee, Byungwook Ahn, and Kwang W. Oh, "Hydrodynamic focusing based particle filtration using an island structure with built-in valves", Proc. in ASME-IMECE 2010.

  • Kangsun Lee, C. Kim, Y. Kim, K. Jung, Byungwook Ahn, J. Y. Kang and Kwang W. Oh, "2-layer based microfluidic dilution generator for drug screening", Proc in MicroTAS 2009.

  • Kangsun Lee, Choong Kim, Byungwook Ahn, Yongeun Kim, Ji Yoon Kang, and Kwang W. Oh, "Microfluidic Network based Micro-reactor Platforms for Biological Assay", Nanotechnology in biology and Medicine, the 2nd Integrated Nanostructured Systems (INS) Workshop 2009, Center for the Arts, The University at Buffalo (SUNY), Buffalo, New York, USA.

  • Byungwook Ahn, Rajagopal Panchapakesan, Kangsun Lee, Kwang W. Oh, "Two Phase Droplet; Generation, Sorting and Droplet Charge with E-field", Nanotechnology in biology and Medicine, the 2nd Integrated Nanostructured Systems (INS) Workshop 2009, Center for the Arts, The University at Buffalo (SUNY), Buffalo, New York, USA.

  • Byungwook Ahn, Rajagopal Panchapakesan, Kangsun Lee, Romain Louge and Kwang W. Oh, "Fast, Robust and Simultaneous Sorting with Droplet Generation by Synchronized High Switching Frequency of Electrostatic Actuation", Proc. in MicroTAS 2008.

  • Byungwook Ahn, Rajogopal Panchapakesan, Kangsun Lee and Kwang W. Oh, "Simultaneous sorting with water droplet formation using an electric field", Proc. in ASME-IMECE 2008.

  • Byungwook Ahn and Kwang W. Oh, "A Novel Braille Device Using Meltable Magnetic Nanoparticles," Multifunctional Nanomaterials and Nanodevices, the 1st annual Integrated Nanostructured Systems (INS) Workshop 2007, Center for the Arts, The University at Buffalo (SUNY), Buffalo, New York, USA.
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