Research Experience

Associate Professor, National Taiwan University (August 2019 – Present)

Development of 1st mode shape based damage detection methods for buildings

Structural health monitoring using motion videos: operational modal analysis and damage detection

Automated AI-based crack detection of concrete surfaces from images

Advanced semi-active control strategies with structure-control interaction

Damage diagnosis of civil structures through deep learning algorithms

Structural health monitoring through IMU sensors

Development of equipment isolation platform with geometrically nonlinear damping configuration

Assistant Professor, National Taiwan University (August 2015 - Present)

Operational Modal Analysis Using Frequency-domain System Identification

Structural Health Monitoring Using a Bank of Kalman Filters

Design of Passive Control Systems Using Active Control Algorithms

Damage Detection of Structures Based on Time-Frequency Distributions

Structural Integrity Assessment Using Vision-based Methods

Assistant Research Fellow, National Center for Research on Earthquake Engineering (March 2015 – July 2015)

Signal Processing and Feature Extraction Using Singular Value Decomposition to Time-frequency Distribution

· Denosing and smoothing of multi-channel measurements

· Principle coordinates of earthquake records

· Abnormal signal removal

· Enhanced stochastic system identification

Research Associate, Dept. of Civil Engineering, National Taiwan University (July 2014 – March 2015)

Decentralized Monitoring Systems for Structures via Substructuring Technology

· Automated stochastic subspace system identification for operational modal analysis

· Application of Kalman filter bank for mode shapes updating

· Decentralized system identification through substructuring technology

Associate Professor, Earthquake Engineering Research and Test Center, Guangzhou University (September 2013 – June 2014)

Fault Detection for Sensor Network in Structural Control Systems

· Sensor fault detection using a Kalman filter bank

· Derivation of a Kalman filter bank directly from response measurements of a structure

· Identification of faulty sensor modes

Signal Processing for Structural Health Monitoring

· Developed signal de-noising methods based on kernel regression and singular spectrum analysis

· Applied to simulation data, shaking table testing data, and field measurements

Design and Evaluation Procedure of Multiple Damped Outriggers for a Tall Building

· Modeling of damped outrigger systems using combined Kelvin and Maxwell models

· Utilized dynamic stiffness method to assess a tall building with multiple damped outriggers

· Developed a guidance for damped outrigger design in a tall building against external loading such as strong wind and earthquakes

Postdoctoral Research Associate, NEES at University of Illinois (May 2011 – August 2013)

Enhancement of Large-scale Testing Facility at NEES@Illinois

· Developed tuning and calibration procedure for large-scale and 1/5th-scale loading and boundary condition boxes (LBCB)

· Improved testing-related software for the need of various experiments

· Established testing protocol for cyclic and hybrid testing

Advanced Approach to Enable Hybrid Simulation of Complex Structures

· Developed a high-precision positioning/force control algorithm for large-scale hybrid testing

· Developed a phased approach to hybrid simulation that validates simulation environment prior to large-scale hybrid testing

· Built an accurate LBCB-specimen alignment process

· Established an analysis toolbox for non-contact instrumentation

Hybrid Simulation of a Four-span Curved Bridge

· Executed the hybrid test of a four-span curved bridge in which two large-scale and one small-scale piers were physically evaluated using LBCBs, while the bridge deck and abutments were concurrently simulated

· Modified the hybrid simulation framework to improve testing quality

Real-time Hybrid Simulation of Smart Outrigger Systems for Tall Buildings

· Worked with a Ph.D. student to simulate and experimentally verify semi-active outrigger damping system for a tall building

Improved Hydraulic Control Scheme for Real-time Hybrid Simulation

· Applied an adaptive control method into the feedforward-feedback control approach for real-time hybrid simulation

· Utilized nested control scheme by adding another feedback loop on top of the feedforward-feedback control approach to enhance the accuracy of real-time hybrid simulation

Graduate Research Assistant, Smart Structures Technology Laboratory, University of Illinois at Urbana-Champaign (May 2007 – April 2011)

Multi-axial Active Isolation for Seismic Protection of Buildings

· Designed a model building to portray a building in San Francisco Bay Area

· Built an active isolation system for the model building

· Developed a hybrid system identification approach to obtain a high-fidelity model for understanding of structural behavior and for designing an active controller

· Utilized an augmented system to the LQG control algorithm in order to consider ground motion characteristics in control design

· Established a control design procedure that allow checking stability of an active control system prior to implementation

· Implemented and experimentally verified multi-axial active isolation strategies for buildings against bi-directional seismic excitation

Adaptive Semi-active Control for the ASCE benchmark control problem of smart isolated buildings

· Developed a schedule control scheme that included the nonlinearity of seismic isolation bearings in control design

· Evaluated control performance of the control scheme to the ASCE benchmark control problem of smart isolated buildings

Equivalent Force Control Scheme for Real-time Hybrid Simulation with a Kalman Filter

· Developed a noise-cancelling algorithm for real-time hybrid simulation

· Implemented this new control scheme in a small-scale setup of real-time hybrid simulation

Investigation of Stochastic System Identification Methods for Large-scale Structures

· Built a selection rule of reference nodes in stochastic system identification methods

· Applied this rule in a cable-stayed bridge and a TV tower

Research Assistant, Center of Earthquake Engineering Research, National Taiwan University (January 2006 – December 2006)

Decentralized Control Strategies for Buildings Using a Smart Control and Sensing System

· Developed a reliable semi-active control strategy for building response control

· Combined this control strategy with wireless sensing units

· Implemented decentralized control strategies with smart control devices and wireless sensing units on a three-story building

· Successfully verified semi-active decentralized control strategies using shaking table testing

Research Assistant, National Center for Research on Earthquake Engineering, Taiwan (July 2004 – June 2005)

Semi-active Control Strategies for Response Reduction of Cable Vibrations

· Developed a finite element model for the Gi-Lu cable-stayed bridge with the geometric nonlinearity is considered

· Investigated dynamic characteristics and seismic performance of the cable-stayed bridge

· Derived new semi-active control strategies for bridge structures

Graduate Research Assistant, Department of Civil Engineering, National Taiwan University (September 2002 – June 2004)

Applications of Semi-active Control to a Building and Cable-stayed Bridge in Simulation

· Developed a mechanical model for MR dampers

· Explored semi-active control strategies for a model building with MR damper

· Applied semi-active control strategies for the ASCE benchmark control problem of a cable-stayed bridge