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Welcome to Chi-Ok Hwang's Personal Homepage

Professor in the Department of Mathematical Sciences at the Gwangju Institute of Science and Technology (GIST).

My research primarily focuses on Computational Sciences, specifically Diffusion Monte Carlo methods, Kinetic Monte Carlo simulations, molecular dynamics, and electronic structure calculations.

πŸ‘€ Personal Info

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🧘 Hobby Links

Traditional Korean mind-body training and spiritual research websites:

This page is maintained by Chi-Ok Hwang.

Department of Mathematical Sciences, Gwangju Institute of Science and Technology.

Resume

πŸŽ“ Education

1994 – 1996
M.S. in Physics

Computational Science emphasis.

1989 – 1991
M.S. in Astronomy

Cosmology focus.
Thesis: "Primordial Black Holes in the Very Early Universe"

1984 – 1988
B.S. in Astronomy

Thesis: "Galaxy Formation"

1981 – 1983
Suncheon High School (μˆœμ²œκ³ λ“±ν•™κ΅)
33rd Graduating Class

High School Diploma (33회)

1978 – 1980
Gwangyang Okryong Middle School (κ΄‘μ–‘μ˜₯룑쀑학ꡐ)
7th Graduating Class

Located in Okryong-myeon, Gwangyang-si (κ΄‘μ–‘μ‹œ μ˜₯룑면 μ†Œμž¬, 7회, ν˜„μž¬ 폐ꡐ)

1972 – 1977
Okryong Elementary School (μ˜₯룑ꡭ민학ꡐ)
52nd Graduating Class (Currently μ˜₯λ£‘μ΄ˆλ“±ν•™κ΅)

Located in Okryong-myeon, Gwangyang-si (κ΄‘μ–‘μ‹œ μ˜₯룑면 μ†Œμž¬, 52회)

πŸ’Ό Employment

2017 – Present
Professor
Gwangju Institute of Science and Technology (GIST)

Research on Diffusion Monte Carlo methods, etc.

2010 – 2017
Associate Professor
Gwangju Institute of Science and Technology (GIST)

Research on Diffusion Monte Carlo methods, etc.

2006 – 2010
Senior Researcher

Daejeon, Korea. Research on Diffusion Monte Carlo.

2005 – 2006
Research Professor
Computer Aided Molecular Design Research Center, Soongsil University

Research on Ising Antiferromagnetic Models.

2003 – 2005
Visiting Professor
Computational Electronics Center, Inha University

KMC for dopant diffusion in Si, molecular dynamics for ion implantation, SIESTA/VASP calculations.

2002 – 2003
Research Professor
Innovative Technology Center for Radiation Safety, Hanyang University

Research on Monte Carlo methods for Nuclear Engineering.

1999 – 2002
PostDoctoral Research Associate
Florida State University

Research on SPRNG (Parallel Random Number Generators).

1998 – 1999
Research Assistant
University of Southern Mississippi

Research on First Passage Algorithms.

1995 – 1997
Teaching Assistant
University of Southern Mississippi

Instructed Astronomy and Physics Labs.

1992 – 1994
Instructor
Private Educational Institute

Taught high school students.

1990 – 1992
Teaching Assistant
Seoul National University

Helped Astronomy professors.

πŸ”¬ Research Areas

Ab-initio electronic structure calculations (SIESTA, VASP) Molecular dynamics for ion implantation Kinetic (Lattice) Monte Carlo for dopant diffusion Hybrid Monte Carlo for particle transport (Nuclear Eng) Green's Function Last-Passage Algorithms Green's Function First-Passage Algorithms Monte Carlo Simulations SPRNG (Scalable Parallel Random Number Generators) Parallel computing using MPI Numerical solutions of Differential Equations

🌐 Memberships & Awards

Professional Memberships:

  • Korean Mathematical Society (KMS)
  • Korean Society for Industrial and Applied Mathematics (KSIAM)
  • Korean Physical Society (KPS)

Awards & Honors:

  • 2004 – 2005: KOSEN Expert
  • 1999: Elected to Sigma Pi Sigma (National Physics Honor Society, USM Chapter)
  • 1995 – 1997: Rotary Foundation Multi-Year Ambassadorial Scholarship ($10,000/year)

Publications & Presentations

Use the options below to instantly search and filter publications, conference papers, and presentations by keyword, year, or document type.

International Journal Papers

  1. Muhammad Awais, Taeil Yoon, Chi-Ok Hwang and Byeongha Lee, "DenSFA-PU: Learning to unwrap phase in severe noisy conditions", Optics & Laser Technology, 187, 112757 (2025)
  2. Jaeho Kim and Chi-Ok Hwang, "Electrical properties of the unit square plate", Journal of Electrostatics, 129, 103907 (2024)
  3. Youngjoo Chung, C.-O. Hwang and Hyun Seok Yang, "Algebraic properties of Riemannian manifolds", General Relativity and Gravitation, 55, 92 (2023)
  4. Jinseong Son, Dongheyon Shin and C.-O. Hwang, "Walk-on-Hemispheres first-passage algorithm", Scientific Reports, 13, 1143 (2023)
  5. H. Jang, U. Yu and C.-O. Hwang, "Octupole Last-Passage Algorithm for Charge Density on the Fichera-Corner Conducting Surface", Advanced Theory and Simulations, 202300436 (2023)
  6. Jinseong Son, Junhyeok Im and C.-O. Hwang, "Sphere Last-Passage Algorithm for Charge Density on a Smooth (Convex) Conducting Surface", Advanced Theory and Simulations, 202200608 (2022)
  7. Chanyong Park, C.-O. Hwang, Kyungchan Cho and Se-Jin Kim, "Dual geometry of entanglement entropy via deep learning", Physical Review D, 106, 106017 (2022)
  8. Unjong Yu, Hoseung Jang and C.-O. Hwang, "A diffusion Monte Carlo method for charge density on a conducting surface at non-constant potentials", Monte Carlo Methods and Applications, 27(4), pp315-324 (2021)
  9. H. Jang, J. Park, U. Yu and C.-O. Hwang, "Quadrupole Last-passage Algorithm for Charge Density on an L-Shaped Conducting Surface", Advanced Theory and Simulations, doi:10.1002/adts.202100180 (2021)
  10. H. Jang, J. Park, U. Yu and C.-O. Hwang, "Last-passage Monte Carlo Algorithm for Charge Density on a Conducting Spherical Surface", Journal of Scientific Computing, doi:10.1007/s10915-021-01594-w (Aug. 6, 2021)
  11. H. Jang, J. Given, U. Yu and C.-O. Hwang, "Last-passage Algorithm for Charge Distribution over a Finite Region", Advanced Theory and Simulations, doi:10.1002/adts.202000268 (Jan. 4, 2021)
  12. H. Jang, U. Yu, Y. Chung and C.-O. Hwang, "Off-centered Last-passage Monte Carlo Algorithm for the Charge Density on a Flat Conducting Surface", Advanced Theory and Simulations, 3(8) (July 10, 2020)
  13. C.-O. Hwang, M. Kim, "Infinite Parallel Plates Algorithm", Advanced Theory and Simulations, 3(6), doi:10.1002/adts.202000014 (May 5, 2020)
  14. C.-O. Hwang, Mi Do, "Fast Diffusion Monte Carlo Sampling via Conformal Map", Applied Mathematics, 11, pp35-41 (Jan. 2020)
  15. C.-O. Hwang, Youngmin Ko, Mingyo Kim and Jiseop Lim, "Comment on 'Radial dependence of induced current density and small pixel effect in parallel-plate detectors'", IEEE Transaction on Nuclear Science, 66(9), pp2153-2155 (Sept. 2019)
  16. C.-O. Hwang, Y. Kim, C. Im and S. Lee, "Buffon's Needle Algorithm to Estimate π", Applied Mathematics, 8, pp275-279 (March 3, 2017)
  17. W. Kwak, Sanghyun Kim, and C.-O. Hwang, "Phase Transitions of 2D Triangular Antiferromagnetic Ising Model in a Uniform Magnetic Field near h=0 and T=0", Journal of Physics: Conference Series, 750, 012012, pp1-5 (2016)
  18. C.-O. Hwang, S. Park and W. Kwak, "Study of the Antiferromagnetic Blume-Capel Model on kagome Lattice", Journal of Physics: Conference Series, 750, 012016, pp1-4 (2016)
  19. C.-O. Hwang, Sungpyo Hong and Jinwoo Kim, "Off-centered 'Walk-on-Spheres' (WOS) Algorithm", Journal of Computational Physics, 303, pp331-335 (Dec. 15, 2015)
  20. C.-O. Hwang, S.-Y. Kim, "Field-induced Kosterlitz-Thouless Transition in Critical Triangular-lattice Antiferromagnets", Monte Carlo Methods and Applications, 20(3), pp217-221 (2014)
  21. S.-Y. Ha, T. Ha, C.-O. Hwang, and H. Lee, "Nonlinear Instability of the One-Dimensional Vlasov-Yukawa System", Journal of Mathematical Physics, 52, 033301, pp1-23 (2 Mar. 2011)
  22. C.-O. Hwang and S.-Y. Kim, "Yang-Lee Zeros of the Triangular Ising Antiferromagnets", Physica A: Statistical Mechanics and its Applications, 389, pp5650-5654 (2010)
  23. C.-O. Hwang, M. Mascagni and T. Won, "Review: Monte Carlo Methods for Cube Capacitance", Mathematics and Computers in Simulation, 80, pp1089-1095 (2010)
  24. C.-O. Hwang, "Six-state clock model on the square lattice: Fisher zero approach with Wang-Landau sampling", Physical Review E, 80, 042103 (29 Oct. 2009)
  25. J.H.Yoo, C.-O. Hwang and T. Won, "Minimized Atomistic Model (MAM) and Main Evolution Path for Dominant BmIn Clusters in Boron Diffusion", Molecular Simulation, 35(9), pp714-718 (Aug. 2009)
  26. S.-Y. Kim, C.-O. Hwang and J. M. Kim, "Partition Function Zeros of the Antiferromagnetic Ising Model on Triangular Lattice in the Complex Temperature Plane for Nonzero Magnetic Field", Nuclear Physics B, 805, pp441-450 (June 2008)
  27. C.-O. Hwang, S.-Y. Kim, D. Kang and J. M. Kim, "Thermodynamic Properties of the Triangular-Lattice Ising Antiferromagnet in a Uniform Magnetic Field", Journal of the Korean Physical Society, 52, S203-S208 (Feb. 2008)
  28. K.-S. Yoon, C.-O. Hwang, and T. Won, "Determination of the KMC Parameters for Indium Diffusion in Silicon Substrates via an Ab-Initio Calculation", Journal of the Korean Physical Society, 50(6), pp1651-1655 (June 2007)
  29. C.-O. Hwang, S.-Y. Kim, D. Kang and J. M. Kim, "Ising Antiferromagnets in a Nonzero Uniform Magnetic Field", Journal of Statistical Mechanics: Theory and Experiment, L05001:1-8 (May 2007)
  30. C.-O. Hwang, "Self-Diffusion Constants in Silicon: Ab Initio Calculations in Combination with Classical Rate Theory", Journal of Chemical Physics, 125, pp226101-1~3 (Dec. 14, 2006)
  31. C.-O. Hwang and J. A. Given, "Last-Passage Monte Carlo Algorithm for Mutual Capacitance", Physical Review E, 74, 027701 (pp1-3) (Aug. 4, 2006)
  32. K.-S. Yoon, C.-O. Hwang, Y.-H.Yoo, and T. Won, "First-Principles Investigation of Indium Diffusion in Silicon Substrates", Journal of the Korean Physical Society, 48, pp535-539 (Apr. 2006)
  33. C.-O. Hwang and T. Won, "Last-passage Algorithms for Corner Charge Singularity of Conductors", Journal of the Korean Physical Society, 47, ppS464-S466 (Nov. 2005)
  34. J.-H.Yoo, C.-O. Hwang, B.-J. Kim and T.-Y. Won, "Simple Atomistic Modeling of Dominant BmIn Clusters in Boron Diffusion", Molecular Simulation, 31, pp817-824 (Oct. 15, 2005)
  35. C.-O. Hwang and T. Won, "Edge Charge Singularity of Conductors", Journal of the Korean Physical Society, 45, ppS551-S553 (Dec. 2004)
  36. C.-O. Hwang and M. Mascagni, "Electrical Capacitance of the Unit Cube", Journal of Applied Physics, 95(7), pp3798-3802 (April 1, 2004)
  37. C.-O. Hwang, "Extrapolation Technique in the 'Walk on Spheres' Method for the Capacitance of the Unit Cube", Journal of the Korean Physical Society, 44(2), pp469-470 (Feb. 2004)
  38. C.-O. Hwang and M. Mascagni, "Analysis and Comparison of Green's Function First-Passage Algorithms with 'Walk on Spheres' Algorithms", Mathematics and Computers in Simulation, 63(6), pp605-613 (Nov. 24, 2003)
  39. J. A. Given and C.-O. Hwang, "Edge Distribution Method for Solving Elliptic Boundary Value Problems with Boundary Singularities", Physical Review E, 68, 046128 (pp1-6) (Oct. 27, 2003)
  40. M. Mascagni and C.-O.Hwang, "ε-Shell Error Analysis in 'Walk On Spheres' Algorithms", Mathematics and Computers in Simulation, 63(2), pp93-104 (Jun. 10, 2003)
  41. C.-O. Hwang, M. Mascagni and J. A. Given, "A Feynman-Kac Path-Integral Implementation for Poisson's Equation Using an h-conditioned Green's Function", Mathematics and Computers in Simulation, 62(3-6), pp347-355 (Mar. 3, 2003)
  42. C.-O. Hwang and M. Mascagni, "Capacitance of the Unit Cube", Journal of the Korean Physical Society, 42, ppL1-L4 (Jan. 15, 2003)
  43. J. A. Given, C.-O. Hwang and M. Mascagni, "First- and Last-Passage Monte Carlo Algorithms for the Charge Density Distribution on a Conducting Surface", Physical Review E, 66, 056704 (pp1-8) (Nov. 22, 2002)
  44. C.-O. Hwang, J. A. Given and M. Mascagni, "Rapid Diffusion Monte Carlo Algorithms for Fluid Dynamic Permeability", Monte Carlo Methods and Applications, 7(3-4), pp213-222 (2001)
  45. C.-O. Hwang, J. A. Given and M. Mascagni, "The Simulation-Tabulation Method for Classical Diffusion Monte Carlo", Journal of Computational Physics, 174(2), pp925-946 (Dec. 10, 2001)
  46. J. A. Given, M. Mascagni and C.-O. Hwang, "Continuous Path Brownian Trajectories for Diffusion Monte Carlo Via First- and Last-Passage Distributions", Lecture Notes in Computer Science, 2179, pp46-57 (June 2001)
  47. C.-O. Hwang and M. Mascagni, "A Feynman-Kac Path-Integral Implementation for Poisson's Equation", Lecture Notes in Computer Science, 2073, pp1282-1288 (May 2001)
  48. C.-O. Hwang and M. Mascagni, "Efficient Modified 'Walk On Spheres' Algorithm for the Linearized Poisson-Boltzmann Equation", Applied Physics Letters, 78(6), pp787-789 (Feb. 5, 2001)
  49. C.-O. Hwang, J. A. Given and M. Mascagni, "On the Rapid Estimation of Permeability for Porous Media Using Brownian Motion Paths", Physics of Fluids, 12(7), pp1699-1709 (July 2000)

Books

  1. ν™©μΉ˜μ˜₯, β€œκ³Όν•™κ³Όμ’…κ΅μ˜μ‹œκ°„κ³Όκ³΅κ°„β€, μƒκ°μ˜νž˜ (2014λ…„ 9μ›” 30일 μΆœκ°„)

Refereed Chapters in Edited Volumes

  1. C.-O. Hwang, "Solving Partial Differential Equations via Random Walks: A Review", Statistical Mechanics and Random Walks, A. Skogseid and C. Fasano, editors, Nova Science Publishers, Inc., pp433-442 (2012)
  2. C.-O. Hwang, M. Mascagni and N. Simonov, "Monte Carlo Methods for the Linearized Poisson-Boltzmann Equation", CFD Collection: Monte Carlo Methods, Hyper Technology Software, 2006.
  3. J. A. Given, C.-O. Hwang and M. Mascagni, "First- and Last-Passage Algorithms In Diffusion Monte Carlo", New Directions in Statistical Physics: Econophysics, Bioinformatics, and Pattern Recognition, L. T. Wille, editor, Springer-Verlag: Berlin/New York, pp47-66 (Jan. 2004).

Refereed National Journal Papers

  1. H. I. Park, S. Pahadia, C. Hwang and C.-O. Hwang, "Numerical Analysis of Chords Summation Algorithm for π Value", Journal of Applied Mathematics and Informatics, 38(3-4), pp277-290 (March 2020)
  2. W.-J. Sim, Y.-W Kim, C.-O. Hwang, "A Study on the Network Landscape of Korean Folktales", Journal of Korean Oral Literature, 37, pp73-105 (Dec. 2013)
  3. C.-O. Hwang, J. Seo, O. Kwon, K. Kim and T. Won, "An Introduction to Kinetic Monte Carlo Methods for Nano-scale Diffusion Process Modeling", Journal of the Institute of Electronics Engineers of Korea, 41-SD(6), pp435-441 (June 2004)
  4. C.-O. Hwang, "Quasi-Random Number Generation in the View of Parallel Implementation", Trends in Mathematics, 6(2), pp155-162 (Dec. 2003)
  5. C. O. Hwang, J. J. Hyun, "Primordial Black Holes in the Very Early Universe", Publications of the Korean Astronomical Society (P.K.A.S.), 6(1), pp38-49 (Dec. 1991)

Academic Presentations & Talks

Preprints

  1. C.-O. Hwang and S.-Y. Kim, "Scaling Exponents of 2-D Triangular Ising Antiferromagnets in an External Magnetic Field", submitted to Journal of Statistical Mechanics: Theory and Experiment, 2009.

Registered Software & Misc Articles

  1. C.-O. Hwang, β€œMutual capacitance 계산 예,” ν”„λ‘œκ·Έλž¨λ“±λ‘ (2008-01-181-000292) (Jan. 21, 2008).
  2. C.-O. Hwang, "κ³Όν•™μ΄λž€ 무엇인가?," ν•œκ΅­μ „λ ₯연ꡬ원 2008 KEPRI저널 λ΄„ν˜Έ, ν†΅κΆŒ27호 μ‚Άκ³Ό κ³Όν•™ 이야기 (Spring 2008).
  3. C.-O. Hwang and T. Won, β€œν‹ˆμƒˆμ›μžμ™€ 결곡의 μ—΄μ²˜λ¦¬λ₯Ό μœ„ν•œ 격자 μžˆλŠ” 동λ ₯학적 λͺ¬ν…ŒμΉ΄μ•Œλ‘œ,” ν”„λ‘œκ·Έλž¨λ“±λ‘ (2005-01-121-001550) (Mar. 16, 2005).
  4. C.-O. Hwang and T. Won, β€œDilute Boron의 μ—΄μ²˜λ¦¬λ₯Ό μœ„ν•œ 동λ ₯학적 λͺ¬ν…ŒμΉ΄μ•Œλ‘œ,” ν”„λ‘œκ·Έλž¨λ“±λ‘ (2005-01-121-001549) (Mar. 16, 2005).
  5. C.-O. Hwang, "Computational science & engineering or scientific computing?," Online Publication in "Webzine", Vol. 41 (Sept. 2005).
  6. C.-O. Hwang and T. Won, β€œμ •μœ‘λ©΄μ²΄ λͺ¨μ–‘μ˜ 완전도체 μ „κΈ°μš©λŸ‰ 계산,” ν”„λ‘œκ·Έλž¨λ“±λ‘ (2004-01-12-167) (Jan. 14, 2004).
  7. C.-O. Hwang, "What is scientific computing?," Newsletter of Innovative Technology Center for Radiation Safety at Hanyang University, Vol. 2, No. 4, pp4-5 (Dec. 2002).
  8. C.-O. Hwang, "Translation in Korean of 'Astronomical Insights'," Creation News Magazine, No. 134, pp48-50 (Nov.-Dec. 2002).

Lectures

Old Lectures

Archived course materials from Inha University, Incheon, Korea (2003)

Thoughts

Collection of Thoughts

Reflections on consciousness, time, space, and spirituality by Chi-Ok Hwang

Philosophical & Scientific Reflections

  • Consciousness: Self consciousness is only a part of your whole consciousness. That is why in your dream you feel yourself as a part of your whole dream even though the whole dream is happening in your consciousness.
  • Christianity and Buddhism: The impersonal attribute of "I am who I am" in Christianity is the absolute existence in Buddhism. In Buddhism, empty space was referred to as an example of the absolute existence.
  • Biological Time: The aging process is not universal.
  • Logical Time (Cause and Effect): The beginning of time by the God is the beginning of the logical time.
  • Other Dimensions of Time:
    • Physical time: clock time
    • Psychological time: subjective feeling of a time period
  • Transgressions: In Christianity, transgressions are acts, things, or beings that distract people from the God.
  • Open Consciousness: An individual consciousness is not a closed system.
  • Resurrection: Resurrection in Christianity was not inconceivable to Oriental people in Taoism or Buddhism.
  • Space Categories:
    • Physical space: the space where things reside.
    • Imaginary space: the space where thoughts reside (e.g., the space your dream makes). The God is ubiquitous in physical space. And the God is in heaven.
  • Self-Consciousness: The right self-consciousness means removing all illusions.
  • Three Factors in the Universe: Spirit (software), energy (electricity), and material (hardware). The superior factor is the Spirit; the other two came from the Spirit (Christianity). Three ways of medical healing come from these three factors: Religious (spiritual), acupunctual (chi), and herbal (or western) medical healing.
  • Two Characters of the Universe:

    There are two attributes of the Universe: Personal and Impersonal. One example of the impersonal attribute is the laws of sciences. Thanks to the personal attribute of the Universe, prayers work.

    The Personal attribute presides over the impersonal attribute, which means that there are gods (spiritual beings) and the God who controls everything. I believe in miracles. The laws of sciences are temporal. The heavens and the Earth will disappear but Its Word remains forever.

    In Christianity, the God is the Father of all spiritual beings. Humans are one of these spiritual beings.

  • Determinism and Predestination:

    In Christianity, we do not believe in determinism but in predestination. The difference comes from the fact that the Personal character of the Universe comes first before the impersonal character. Predestination comes from the God's resolution. Its Word never fails, achieves, and returns back to It.

  • Attaining to Perfection:

    After attaining to perfection, you will have no questions. Within you, you have an internal motivation (impetus) to attain perfection. Everything will be clear.

Comparison Among Religions

1. Our Natural Status

  • Buddhism & Taoism: We are in the dark.
  • Christianity: We have the original sin.

2. Our Goal (Unification of Yin & Yang)

  • Buddhism: We should get out of the cycle of reincarnation. We should make the body of Law. Sexual desire is the Buddha nature.
  • Christianity: We should be born spiritually again. The spiritual body is initiated by the Holy Ghost. The Holy Ghost has two properties: water (Yin) and fire (Yang).
  • Taoism: The spiritual body seed is obtained by the unification of true Yin and true Yang.

To Christians Practising Dahn, Zen, or Yoga

  • You may experience the impersonal character (that is, emptiness and fullness in Buddhism) of Jehovah, the God.
  • After the minor awakening of Kundalini in Yoga (going up of true living water into the center of your brain in Dahn), you should lower the true living water into your heart (into the center of your lower belly in Dahn).
  • Jehovah ("I am who I am" in Hebrew) is the source of living water (1,6 water in Dahn).
  • The Holy Spirit has two properties: water (Yin) and fire (Yang), just like the 1,6 water in Dahn.
  • Being born again in Christianity is the revival of your spiritual body.
  • The Spirit of Jehovah never sleeps.