Prof. Chih-Chen Chang Profile

Prof. Chih-Chen Chang

Professor at Hong Kong Univ of Science and Technology

SPIE Involvement:

Author

Publications (28)

Proceedings Article | 1 April 2019 Paper

Surface damage detection for concrete bridges using single-stage convolutional neural networks

Chaobo Zhang, Chih-Chen Chang

Proceedings Volume 10972, 109722E (2019) https://doi.org/10.1117/12.2513571

KEYWORDS: Bridges, Inspection, Sensors, Damage detection, Convolutional neural networks, Data modeling, Image processing, Artificial intelligence

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Proceedings Article | 15 March 2018 Paper

Simultaneous vibration control and energy harvesting using actor-critic based reinforcement learning

Cheng Ning Loong, C. C. Chang, Elias Dimitrakopoulos

Proceedings Volume 10595, 105952Q (2018) https://doi.org/10.1117/12.2295304

KEYWORDS: Control systems, Transducers, Vibration control, Electromagnetism, Energy harvesting, Sensors, Neural networks, Detection and tracking algorithms, Modeling, Civil engineering

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Proceedings Article | 12 April 2017 Presentation + Paper

A new self-powered electromagnetic damper for structural vibration control

Maziar Jamshidi, Chih Chen Chang

Proceedings Volume 10168, 101682E (2017) https://doi.org/10.1117/12.2256657

KEYWORDS: Electromagnetism, Vibration control, Control systems, Energy harvesting, Electronic components, Earthquakes, Switching, Resistance, System on a chip

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Proceedings Article | 20 April 2016 Presentation + Paper

In-plane motion measurement by using digital sampling moiré method

Xinxing Chen, Chih-Chen Chang

Proceedings Volume 9803, 980311 (2016) https://doi.org/10.1117/12.2217259

KEYWORDS: Motion measurement, Digital recording, Fourier transforms, Visual process modeling, Sensor performance, Cameras, Imaging systems, Fringe analysis, Numerical simulations, 3D metrology, 3D acquisition, Doppler effect, Distortion

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Proceedings Article | 3 April 2015 Paper

A digital sampling moiré method for two-dimensional displacement measurement

Xinxing Chen, Chih-Chen Chang

Proceedings Volume 9435, 943523 (2015) https://doi.org/10.1117/12.2084148

KEYWORDS: Cameras, Sensors, Motion measurement, Civil engineering, Safety, Optical design, Numerical simulations, MATLAB, Digital cameras, Global Positioning System

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Proceedings Article | 10 April 2014 Paper

Scavenging vibration energy from seismically isolated bridges using an electromagnetic harvester

Qiuchen Lu, Chengning Loong, Chih-Chen Chang, Elias Dimitrakopoulos

Proceedings Volume 9061, 90610I (2014) https://doi.org/10.1117/12.2044839

KEYWORDS: Bridges, Electromagnetism, Energy harvesting, Optical isolators, Wind energy, Earthquakes, Bismuth, Intelligence systems, Civil engineering, Capacitors

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Proceedings Article | 19 April 2013 Paper

Implementation of a wireless image motion estimation method for two-dimensional crack monitoring

Sin-Hang Man, Chih-Chen Chang, Muhammad Hassan, Amine Bermak

Proceedings Volume 8692, 86922E (2013) https://doi.org/10.1117/12.2009427

KEYWORDS: Sensors, Digital signal processing, Motion estimation, Image sensors, Image processing, Ions, Optical navigation, Neodymium, Calibration, Digital image processing

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Proceedings Article | 6 April 2012 Paper

A preliminary study on the use of optical navigation sensor for two dimensional crack propagation monitoring

Chih-Chen Chang, Sin-Hang Man, Cheng Zhong Ng, Muhammad Hassan, Amine Bermak

Proceedings Volume 8345, 834532 (2012) https://doi.org/10.1117/12.914546

KEYWORDS: Sensors, Digital signal processing, Optical navigation, Calibration, Neodymium, Image processing, Optical flow, Signal processing, Speckle, Fiber optics sensors

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Proceedings Article | 1 April 2010 Paper

Adaptive noise variance identification for data fusion using subspace-based technique

Zhen Li, C. Chang

Proceedings Volume 7647, 76471U (2010) https://doi.org/10.1117/12.847353

KEYWORDS: Filtering (signal processing), Interference (communication), Data fusion, Principal component analysis, Error analysis, Signal processing, Global Positioning System, Sensors, Time metrology, Data analysis

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Proceedings Article | 30 March 2009 Paper

Recursive stochastic subspace identification for structural parameter estimation

C. C. Chang, Z. Li

Proceedings Volume 7292, 729235 (2009) https://doi.org/10.1117/12.815422

KEYWORDS: Stochastic processes, Signal processing, Data processing, System identification, Detection and tracking algorithms, Filtering (signal processing), Digital filtering, Structural health monitoring, Performance modeling, Modal analysis

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Proceedings Article | 8 April 2008 Paper

Tracking time-varying properties of hysteretic structure by wavelet multi-resolution analysis

C. C. Chang, Y. F. Shi

Proceedings Volume 6932, 693229 (2008) https://doi.org/10.1117/12.776516

KEYWORDS: Wavelets, Systems modeling, Error analysis, Analytical research, Mathematical modeling, Statistical analysis, Filtering (signal processing), Motion models, Monte Carlo methods, System identification

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Proceedings Article | 10 April 2007 Paper

Non-target image technique for spatial-temporal structural responses measurement

C. Chang, Yunfeng Ji

Proceedings Volume 6529, 65291K (2007) https://doi.org/10.1117/12.715989

KEYWORDS: Cameras, 3D image processing, Calibration, 3D acquisition, 3D metrology, Imaging systems, Edge detection, Digital imaging, Wavelets, Image acquisition

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Proceedings Article | 5 April 2007 Paper

From photogrammetry, computer vision to structural response measurement

C. Chang

Proceedings Volume 6529, 652903 (2007) https://doi.org/10.1117/12.723484

KEYWORDS: Cameras, Calibration, Photogrammetry, Image segmentation, Machine vision, Computer vision technology, 3D image processing, Bridges, Optical flow, Buildings

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Measuring displacement response of large-scale structures is necessary to assess their performance and health condition. Current global position systems (GPS), with a significant cost, can provide point coordinate measurement with an accuracy of ±1cm horizontally and ±2cm vertically at a sampling frequency up to 20 Hz. Photogrammetry is a measurement technology in which the three-dimensional coordinates of points on an object are determined by measurements made with two or more photographic images taken from different positions. This technology is regaining its popularity in various engineering disciplines due to a recent remarkable evolution in the consumer digital cameras. The image resolution of these cameras has increased rapidly from below 1 million pixels a few years ago to over 10 million pixels today, with little increase or even decrease in cost. Image sequences recorded by these cameras contain both spatial and temporal information of the target object; hence can be used to extract the object's dynamic characteristics such as natural frequencies and mode shapes. Research indicates that accuracy in the order of as high as 1 part in 30,000 can be achieved when cameras are properly calibrated in the field and multiple high-resolution images are used. At this level of accuracy, point positions of a 30m object would be accurate to 1mm at 68% probability and responses of large-scale structures can be measured for further meaningful processing and interpretation. In this paper, several image-based sensing techniques that can be used for measuring response of large-scale structures are presented. These techniques are developed based on some methods from photogrammetry and computer vision such as the optical flow method and the egomotion estimation. Examples used to illustrate these techniques include response measurement of buildings and cable-stayed bridges. Results show that the image-based sensing techniques have a great potential for accurately measuring displacement responses of these large-scale structures.

Proceedings Article | 11 April 2006 Paper

Identification of modal responses of hysteretic structures using Hilbert-Huang method

Chun-Wing Poon, Chih-Chen Chang

Proceedings Volume 6174, 61743C (2006) https://doi.org/10.1117/12.658355

KEYWORDS: Modal analysis, Neodymium, Motion models, Signal analyzers, Nonlinear optics, Fourier transforms, Complex systems, Superposition, Time-frequency analysis, Systems modeling

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Proceedings Article | 11 April 2006 Paper

Study on vulnerability assessment of cable-stayed bridges

C. C. Chang, D. Yan

Proceedings Volume 6174, 61741M (2006) https://doi.org/10.1117/12.658101

KEYWORDS: Bridges, Failure analysis, Tolerancing, Earthquakes, Databases, Chemical elements, Civil engineering, Explosives, Transportation security, Smart materials

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Proceedings Article | 5 April 2006 Paper

Identification of structural dynamic behavior for continuous system based on videogrammetric technique

Yunfeng Ji, C. C. Chang

Proceedings Volume 6173, 61731I (2006) https://doi.org/10.1117/12.657828

KEYWORDS: Cameras, Calibration, Structural dynamics, Imaging systems, 3D image processing, Edge detection, 3D metrology, Image processing, 3D acquisition, Sensors

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Proceedings Article | 17 May 2005 Paper

Identification of nonlinear normal modes of structures using the empirical mode decomposition method

Chun-Wing Poon, Chih-Chen Chang

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.599237

KEYWORDS: Complex systems, Neodymium, Modal analysis, Signal analyzers, Superposition, Nonlinear optics, Systems modeling, Matrices, Fourier transforms, Motion models

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Proceedings Article | 17 May 2005 Paper

High precision videogrammetric technique for structural dynamic response measurement

Chih-Chen Chang, Yunfeng Ji

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.599320

KEYWORDS: Cameras, Calibration, 3D image reconstruction, Imaging systems, 3D metrology, 3D image processing, Bridges, Photogrammetry, Digital cameras, 3D acquisition

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Proceedings Article | 17 May 2005 Paper

Multi-component signal decomposition techniques for structural health monitoring

Chih-Chen Chang, Zhi Sun, Chun-Wing Poon, Kin-Wai Sze

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.599303

KEYWORDS: Principal component analysis, Wavelets, Structural health monitoring, Fourier transforms, Signal analyzers, Wavelet transforms, Time-frequency analysis, Damage detection, Sensors, Signal processing

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Proceedings Article | 29 July 2004 Paper

Covariance-driven asymptotic wavelet analysis for modal identification

Zhi Sun, Chih-Chen Chang

Proceedings Volume 5391, (2004) https://doi.org/10.1117/12.540281

KEYWORDS: Wavelets, Wavelet transforms, Modal analysis, Error analysis, Fourier transforms, Matrices, Stochastic processes, Sun, Civil engineering, Buildings

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Proceedings Article | 21 July 2004 Paper

Direct damage diagnosis of structural component using vibration response

Tian-Wei Ma, Henry Yang, Chih-Chen Chang

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.539676

KEYWORDS: Structural health monitoring, System identification, Structural dynamics, Earthquakes, Matrices, Actuators, Signal processing, Time metrology, Damage detection, Inspection

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Proceedings Article | 21 July 2004 Paper

Structural damage assessment using principal component analysis

Chih-Chen Chang, K. Sze, Zhi Sun

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.540247

KEYWORDS: Principal component analysis, Earthquakes, Electroluminescence, Shape analysis, Neodymium, Civil engineering, Matrices, Structural health monitoring, Damage detection, Data modeling

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Proceedings Article | 21 July 2004 Paper

Dynamic characterization of a damaged beam using empirical mode decomposition and Hilbert spectrum method

Chih-Chen Chang, Chun-Wing Poon

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.540230

KEYWORDS: Fourier transforms, Signal analyzers, Bandpass filters, Failure analysis, Time-frequency analysis, System identification, Nonlinear optics, Wavelet transforms, Damage detection, Complex systems

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Proceedings Article | 18 August 2003 Paper

Multivariable adaptive fuzzy control for nonlinear building-MR damper systems

Li Zhou, Chih-Chen Chang

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.488891

KEYWORDS: Control systems, Fuzzy logic, Complex systems, Nonlinear control, Adaptive control, Buildings, Fuzzy systems, Earthquakes, Actuators, Nickel

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Proceedings Article | 18 August 2003 Paper

Locating and quantifying structure damage using spatial wavelet packet signature

Chih-Chen Chang, Zhi Sun

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.482769

KEYWORDS: Wavelets, Wavelet packet decomposition, Mathematical modeling, Sun, Matrices, Digital filtering, Civil engineering, Signal processing, Bridges, Fourier transforms

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Proceedings Article | 3 August 2001 Paper

Continuous condition assessment for bridges based on wavelet packets decomposition

Zhi Sun, C. Chang

Proceedings Volume 4337, (2001) https://doi.org/10.1117/12.435611

KEYWORDS: Wavelet packet decomposition, Wavelets, Bridges, Signal processing, Neural networks, Interference (communication), Signal analyzers, Numerical simulations, Optical inspection, Nondestructive evaluation

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Proceedings Article | 9 June 2000 Paper

Iterative constrained optimization scheme for model updating of long-span bridges

Chih-Chen Chang, T. Y. Chang, Q. W. Zhang

Proceedings Volume 3995, (2000) https://doi.org/10.1117/12.387825

KEYWORDS: Bridges, 3D modeling, Data modeling, Optimization (mathematics), Computer programming, Matrices, Finite element methods, Spine, Shape analysis, Error analysis

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Proceedings Article | 20 April 2000 Paper

Adaptive fuzzy control for a structure-MR damper system

Li Zhou, Chih-Chen Chang

Proceedings Volume 3988, (2000) https://doi.org/10.1117/12.383131

KEYWORDS: Control systems, Adaptive control, Complex systems, Fuzzy logic, Earthquakes, Fuzzy systems, Actuators, Algorithm development, Intelligence systems, Civil engineering

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Showing 5 of 28 publications

Conference Committee Involvement (18)