Research Experience

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

à        Operational Modal Analysis Using Frequency-domain System Identification

à        Structural Health Monitoring Using a Bank of Kalman Filters

à        Design of Passive Control Systems Using Active Control Algorithms

à        Damage Detection of Structures Based on Time-Frequency Distributions

à        Structural Integrity Assessment Using Vision-based Methods

 

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

à        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)

à        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)

à        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

à        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

à        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)

à        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

à        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

à        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

à        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

à         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)

à        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

à        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

à        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

à        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)

à        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)

à        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)

à        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