Sunjoong Kim, Ph.D.
Curriculum Vitae

Postdoctoral researcher
BK21PLUS Research Program
Dept. of Civil and Environmental Engineering
Seoul National University
Room 314, Building 35
1 Gwanak-ro, Gwanak-gu, Seoul, Korea
Email: fanta909@snu.ac.kr 
Office: +82-2-880-2279
Mobile: +82-10-7402-1845

RESEARCH INTERESTS

  • Operational Modal Analysis (OMA), Damping estimation, Structural health monitoring, Vibration assessment, Structural dynamics, Aerodynamic, Wind engineering

EDUCATIONS

  • 2012-2017: Ph.D. Department of Civil & Environmental Engineering, Seoul National University
    • Major concentration: OMA-based damping estimation
    • Minor: Vibration/serviceability assessment, field tests, wind tunnel test and vibration control
    • Thesis: Enhancing damping estimation in cable-supported bridges under operational conditions
    • Advisor: Prof. Ho-Kyung Kim
    • Relevant courses: Earthquake Engineering, Structural Reliability, Numerical Analysis in Mechanical Engineering, Advanced Bridge Engineering, 

  • 2010-2012: M.S. Department of Civil & Environmental Engineering, Seoul National University
    • Major concentration: Structural engineering, wind engineering 
    • Thesis: Evaluation of characteristic of wake galloping of unparallel cylinders by wind tunnel test
    • Advisor: Prof. Ho-Kyung Kim
    • Relevant courses: Theory of Elasticity, Advanced Structural Analysis, Finite Element Method, Dynamics of Structures, Bridge Engineering, Structural Optimization

  • 2005-2010: B.S. Department of Civil, Urban & Geosystem Engineering, Seoul National University
    • Major: Civil Engineering
    • Relevant courses: Engineering Mathematics, Mechanics of Materials and Lab., Structural Analysis, Designs of Steel Structures, Statistics for Civil & Environmental Engineers

RESEARCH PROJECTS AND PROFESSIONAL EXPERIENCES

  • 2017-present: Postdoctoral Researcher. BK21PLUS Research Program, Seoul National University
    Based on OMA-based damping estimation process developed during my Ph.D., I aim to conduct the following research to participate in the research project on “Nonstationary Data-Driven Real-Time Damping Identification of Flexible Structures in Operational and its Probabilistic Model” supported by the National Research Foundation (NRF) of Korea grant funded by the Korean government (MSIP) (2017R1A2B4008973)
    • Development of physical relationship between structural damping ratio and environmental/operational influencing factors using the long-term data of accumulated damping ratios, accompanied with other multi-data
    • Development of probabilistic model of structural damping ratio, which enables a reliability-based assessment of vibrational serviceability of flexible structures 

  • 2010-2017: Graduate Student Researcher, Seoul National University 
    I participated in the big research consortium on “Development of technologies for risk assessment of cable bridges and constant securement of resilience against natural and man-made disasters” supported by grants (16SCIPB119960-02) from the Ministry of Land, Infrastructure and Transport of the Korean Government 
    • Enhancing the accuracy of OMA-based damping ratios of cable-supported bridges by introducing an amplitude-modulating function to nonstationary data induced mainly by vehicles and normal winds.
    • Development of reliable automated process for the real-time estimation of damping ratios. 
    • Operation technologies for cable bridges in hazardous situations (strong wind, abnormal vibration)

  • 2013-2014: Graduate Student Researcher, Extreme Performance Testing Center, Seoul National Univ. 
    I partially contributed to the research project on “Establishment of Structural Performance Testing Facilities for Extreme Conditions”.
    • Design/development of a two/single-stage gas gun and split Hopkinson pressure bar.

  • Projects I: The assessment of wind-induced vibration in civil infrastructures
    My research skills–wind tunnel test, operational modal analysis and numerical simulation– were implemented successfully for the investigation of wind-induced vibration of civil infrastructures.
    • UGCC C3 Spillter (2016-2017): Risk assessment of vortex-induced vibration of UGCC C3 Spillter during operational condition based on numerical simulation
    • Ulsan suspension bridge (2015-2016): Performance evaluation of Stockbridge dampers on the mitigation of vortex-induced vibration of stay cables via numerical simulation
    • Yi-Sun-Shin suspension bridge (2015): Damping estimation using measured data for the assessment of cause of higher mode (4th vertical mode) vortex-induced vibration
    • Jindo cable-stayed bridge (2011-2012): Two dimensional wind tunnel test and OMA-based damping estimation for the assessment of cause/effect of vortex-induced vibration

  • Projects II: Wind resistance design of cable-supported bridge during construction stage
    I participated in many projects for wind resistance design/assessment of the construction of long-span bridges via wind tunnel test, wind environmental evaluation and buffeting analysis.
    • Ulsan suspension bridge with Hyundai E&C (2013-2014): Evaluation of design wind speed by MCP analysis using field monitoring data on the top of pylon
    • Hwayang cable-stayed bridge with Hyundai E&C (2012): 3-dimensional full scale wind tunnel test and buffeting analysis for wind resistance design during construction stage
    • Samdo cable-stayed bridge with Korea Consultants International (2011-12): 2-dimensional section model wind tunnel test for wind resistance design
    • Mokpo cable-stayed bridge with GS E&C (2011): Risk assessment of wake galloping of unparallel stay cables via 2-dimensional wind tunnel test

AWARDS

  • Best Young Engineer's Award (2016) 
    • 2016 Korean Institute of Bridge and Structural Engineers (KIBSE) Conference

  • Travel grant (2014)
    • The 6th International Symposium on Computational Wind Engineering - CWE2014

  • Best Paper Award (2012, 2015)
    • Korean Society of Civil Engineers Conference (2012)
    • Korean Steel Structure Conference (2015)

  • Special Jury Award (2010)
    • Conceptual Bridge Design Competition, Korea Bridge Design & Engineering Research Center

EXPERIMENTAL & COMPUTATIONAL SKILLS

  • OMA: Output-only system identification 
    • Natural Excitation Technique (NExT)
    • Eigensystem Realization Algorithm (ERA)
    • Frequency Domain Decomposition (FDD)
    • Stochastic Subspace Identification (SSI)

  • Two dimensional wind tunnel test
    • Section model design
    • Free vibration test using a spring supported system
    • Force-balanced test to extract aerodynamic/elastic coefficients
    • Flow visualization via Particle Image Velocimetry (PIV)

  • Computational skills
    • Programming: MATLAB
    • FEM Software: SAP2000, midas Civil

PEER-REVIEWED PUBLICATIONS

  • (Ph.D Thesis) Kim S, Enhancing damping estimation in cable-supported bridges under operational conditions, Doctoral dissertation, Seoul National University, 2017. 
  • (M.S. Thesis) Kim S, Evaluation of characteristics of wake galloping for parallel cylinders by two dimensional wind tunnel tests, M.S. dissertation, Seoul National University, 2012.

  • Kim S, Kim HK and Hwang YC. Enhanced Damping Estimation for a Cable-Stayed Bridge from Operational Monitoring Data, Structural Engineering International, 2017 (Accepted).
  • Kim S, Kim HK. Damping Identification of Bridges under Nonstationary Ambient Vibration. Engineering. 2017 Nov 23. 
  • Park J, Kim S, Kim HK. Effect of gap distance on vortex-induced vibration in two parallel cable-stayed bridges. Journal of Wind Engineering and Industrial Aerodynamics. 2017 Mar 31;162:35-44.
  • Kim S, Park J, Kim HK. Damping identification and serviceability assessment of a cable-stayed bridge based on operational monitoring data. Journal of Bridge Engineering. 2016 Oct 20;22(3):04016123.
  • Kim S, Kim HK. Wake galloping phenomena between two parallel/unparallel cylinders. Wind and Structures. 2014;18(5):511-28.
  • Kim SJ, Kim HK, Calmer R, Park J, Kim GS, Lee DK. Operational field monitoring of interactive vortex-induced vibrations between two parallel cable-stayed bridges. Journal of wind engineering and industrial aerodynamics. 2013 Dec 31;123:143-54.
  • Kim HK, Kim KT, Lee H, Kim S. Performance of unpretensioned wind stabilizing cables in the construction of a cable-stayed bridge. Journal of Bridge Engineering. 2012 Jul 21;18(8):722-34. 

INTERNATIONAL CONFERENCE (AS A PRESENTER)

  • Kim S, Kim HK, Signal stationarization in damping estimation for bridges from traffic loadings, 8th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII-8), Brisbane, Australia, 5-8 December, 2017 
  • Kim S, Kim HK, Amplitude-dependency of estimated damping ratio by operational modal analysis in a cable-stayed bridge, The 9th International Symposium on Steel Structures (ISSS-2017), Jeju, Korea, November 1-4, 2017
  • Kim S, Kim HK, The effect of lock-in range on OMA-based damping estimation for long-span bridges, The 12th China-Japan-Korea International Workshop on Wind Engineering (CJK2017), Yamanashi, Japan, October, 13-14
  • Kim S, Kim HK, Signal stationarization technique in output-only damping identification, 39th IABSE Symposium Vancouver, Vancouver, Canada, September 19-23, 2017
  • Kim S, Kim HK, Damping identification of bridges from nonstatioary ambient vibration data, ACEM'16, ICC Jeju, Jeju island, Korea, 28 August - 1 September, 2016
  • Kim S, Hwang YC, Kim HK, Application of Various Schemes for Damping Estimation of the Suspension Bridge for the Cause Investigation of a Vortex-Induced Vibration, IABSE Conference – Structural Engineering: Providing Solutions to Global Challenges, Geneva, Switzerland, September 23-25 2015
  • Kim S, Kim HK, The effect of nonstationary condition on identification of damping ratio from ambient vibration data, ACEM'14, BEXCO, Busan, Korea, August 24-28, 2014
  • Kim S, Kim HK, Evaluation of effectiveness of MTMD according to wind condition using ambient vibration measurements, The 6th International Symposium on Computational Wind Engineering, Hamburg, Germany, June. 11, 2014
  • Kim S, Calme R, Kim HK, Estimation of Damping Ratio for a Cable-Stayed subjected to an interference Vortex-Induced Vibration, Cambridge UK, July 7-11, 2013
  • Kim S, Kim HK, Lee H, An Experimental Investigation on Characteristics of Flow Field of Wake Galloping, 18th IABSE Congress, Seoul, Korea, September 20, 2012
  • Kim S, Kim HK, Chung HS, Yoo CH, Park J, Lee H, Wake galloping of unparallel cylinders, Proceedings of the 11th Japan-Korea Joint Seminar on Steel Bridges, Jeju island, Korea, 2011, Aug 25-27, pp.19.
  • Kim S, Lee SH, Kim HK, Evaluation of Wake Galloping of Unparallel Twin Cables of the Mokpo Cable-Stayed Bridge, The 28th Annual International Bridge Conference, Pittsburgh, USA, June 5-8, 2011

Updated: November 28, 2017