Curriculum Vitae
Chai Wah Wu
IBM T. J. Watson Research Center
P. O. Box 218
Yorktown Heights, NY 10598
U. S. A.
Office: 1 (914) 945-1567
E-mail: chaiwahwu@ieee.org
ORCID: http://orcid.org/0000-0002-0657-0683
Research Interests
Digital halftoning algorithms.
Document and multimedia security, digital watermarking and steganography.
Cellular Neural Networks for parallel analog computation and signal processing.
Design and analysis of nonlinear and distributed signal and information processing systems.
Synchronization, consensus and control in complex networks of circuits and systems.
Algebraic graph theory and linear algebra.
Foundations of nonlinear circuit and system theory.
Logic and machine learning
Education
University of California, Berkeley, CA, USA, Doctor of Philosophy in Electrical Engineering, December 1995.
Major field: Nonlinear circuits, systems, and control.
Thesis title: On some aspects of order in circuits and systems.
Minor fields: Signal processing and applied mathematics.
Graduate coursework: All areas of circuits and systems, control and signal processing.
Thesis advisor: Prof. Leon O. Chua.
University of California, Berkeley, CA, USA, Master of Arts in Mathematics, December 1994.
Emphasis: Analysis, algebra and foundations.
Thesis title: Topological dynamics of continuous maps on the n-od.
Thesis advisor: Prof. Charles Pugh.
University of California, Berkeley, CA, USA, Master of Science in Electrical Engineering, December 1991.
Emphasis: Neural networks.
Thesis title: On the universe of stable cellular neural networks.
Thesis advisor: Prof. Leon O. Chua.
Lehigh University, Bethlehem, PA, USA, Bachelor of Science in Computer Engineering and Bachelor of Arts in Cognitive Science, June 1990.
Minor: Mathematics.
Certifications
INFORMS Certified Analytics Professional
Computer Proficiencies
C, FORTRAN, DSP Assembly, MATLAB, Python (including packages such as tensorflow, pytorch, pandas, numpy, scipy, sympy, scikit-learn, scikit-image, streamlit, gmpy2, etc.), Java, BASIC, Pascal, SQL, Unix, Linux, Git, GIS, VBA.
Experience in writing computer software for data analysis, machine learning, image processing, simulation of dynamical systems and processing of real time signals.
Research Experience
6/1997-present: Principal Research Scientist, IBM T. J. Watson Research Center, Yorktown Heights, NY, USA
Developed halftones used in all Ricoh Production Print Solutions' (RPPS) high speed printers today. Project leader of joint Research project with Ricoh Production Print Solutions (formerly IBM Printing Systems Division) on printer-related technologies from 1997 to 2012.
Other responsibilities during this period include serving as the project leader of the Special Mathematics group and as chairman of department patent evaluation committees.
Recent research topics and projects include:
Analog computing for computational science.
Travel data analytics and transit route optimization.
Semiconductor manufacturing defect analysis.
Analysis of synchronization and consensus behavior in complex networks of coupled circuits and systems.
Design and analysis of image halftoning and image processing algorithms.
Analysis of nonlinear behavior in error diffusion algorithms and sigma-delta modulators.
Design and analysis of image and document watermarking and authentication systems.
Design and analysis of privacy preserving data mining systems.
Design and analysis of sensor network deployment algorithms.
Analysis of separability conditions in quantum mechanics.
Optimization and tuning of large-scale integrated circuits.
Algebraic connectivity of directed graphs.
9/2012-1/2015: Manager, Numerical Methods group, IBM T. J. Watson Research Center, Yorktown Heights, NY, USA
Lead a team of researchers in the Business Solutions and Mathematical Sciences department to develop innovative technologies for modeling and optimizing components of a smarter planet such as buildings, transportation networks, and power grids.
1/2011-9/2012: Manager, Intelligent Energy Management group, IBM T. J. Watson Research Center, Yorktown Heights, NY, USA
Lead a team of researchers in the Business Analytics and Mathematical Sciences department to develop innovative solutions for energy management in buildings and data centers, intelligent transportation management and high performance image processing for high speed printers.
4/2007-12/2010: Manager, Distributed Digital Media Infrastructure group, IBM T. J. Watson Research Center, Hawthorne, NY, USA
Lead a team of researchers to develop next generation media-aware middleware and multimedia collaboration solutions.
5/2006-3/2007: Technical Staff to VP of Technical Strategy and Worldwide Operations, IBM T. J. Watson Research Center, IBM T. J. Watson Research Center, Yorktown Heights, NY, USA
Part of the staff responsible for coordinating and managing the yearly Global Technology Outlook (GTO) effort in 2006. Responsibilities include setting up meetings, leading discussions, assembling information, creating the GTO documents and giving internal and customer presentations and training sessions.
4/2005-5/2006: Manager, Foundations of Mathematics group, IBM T. J. Watson Research Center, Yorktown Heights, NY, USA
9/1996-6/1997: Mathematical Sciences Postdoctoral Fellow (precursor of IBM Herman Goldstine Memorial Postdoctoral Fellowship for research in mathematical and computer sciences), IBM T. J. Watson Research Center, Yorktown Heights, NY, USA
1/1996-8/1996: Postdoctoral Researcher, University of California, Berkeley, CA, USA.
9/1990-12/1995: Research Assistant, University of California, Berkeley, CA, USA.
Summer 1989: Sherman Fairchild Scholar, Sherman Fairchild Center for Solid-State Studies, Lehigh University, Bethlehem, PA, USA.
Designed a bit-serial systolic array for the calculation of 1-dimensional convolutions with 1-bit gaps between consecutive words.
Summer 1988: NSF Summer Fellow in Sensor Technologies, Moore School of Electrical Engineering, University of Pennsylvania, Philadelphia, PA, USA.
Designed, manufactured and tested the interchip wiring and packaging for a general purpose neural computer.
Teaching and Mentoring Experience
Mentored various summer student interns over the years.
Adjunct Professor, 1. Department of Electronic and Information Engineering, Hong Kong Polytechnic University. 2. Holcombe Department of Electrical and Computer Engineering, Clemson University.
August 5-14, 2015: University of Minnesota, Minneapolis, MN, USA. Industry mentor at Mathematical Modeling Workshop. Mentor a team of graduate students in solving an industrial research problem.
August 3-12, 2011: University of Minnesota, Minneapolis, MN, USA. Industry mentor at Mathematical Modeling Workshop. Mentor a team of graduate students in solving an industrial research problem.
August 6-15, 2008: University of Minnesota, Minneapolis, MN, USA. Industry mentor at Mathematical Modeling Workshop. Mentor a team of graduate students in solving an industrial research problem.
August 9-18, 2006: University of Minnesota, Minneapolis, MN, USA. Industry mentor at Mathematical Modeling Workshop. Mentor a team of graduate students in solving an industrial research problem.
August 1-10, 2005: University of Minnesota, Minneapolis, MN, USA. Industry mentor at Mathematical Modeling Workshop. Mentor a team of graduate students in solving an industrial research problem.
2005: Member of Ph.D. committee, New Jersey Institute of Technology.
Spring 1998: Columbia University, New York, NY, USA. Taught a graduate course on nonlinear dynamics in science and engineering with Charles Tresser. Partly responsible for preparing the lecture notes used in the class.
Spring 1997: City University of New York, New York, NY, USA. Taught a graduate course on nonlinear dynamics in science and engineering in the Mathematics Department with Charles Tresser. Partly responsible for preparing the lecture notes used in the class.
1/1996-8/1996: Postdoctoral Researcher, University of California, Berkeley, CA, USA. Part of my responsibilities include the supervision of visiting scholars and students. During this time, I have also supervised two graduate students in the Mathematics department at UC Berkeley with Prof. Charles Pugh.
9/1990-12/1995: Research Assistant, University of California, Berkeley, CA, USA.
Supervised several undergraduate students, visiting scholars and postdoctoral scholars in various research projects.
8/1994-12/1994: Head teaching assistant, Department of Electrical Engineering, University of California, Berkeley, CA, USA.
Led weekly discussion section, wrote up homework solutions, designed and organized two term projects, designed and wrote part of the computer software used in the term projects, and handled all administrative details for a senior level class on linear and nonlinear circuit theory.
8/1993-12/1993: Head teaching assistant, Department of Electrical Engineering, University of California, Berkeley, CA, USA.
Led weekly discussion section, wrote up homework solutions, prepare quizzes, designed and organized a term project, and handled all administrative details for a junior level class on linear and non-linear circuit theory of over 60 students.
8/1989-12/1989: Tutor, Challenge for Success program, Lehigh University, Bethlehem, PA, USA.
8/1988-12/1988: Teaching Apprentice, Department of Mathematics, Lehigh University, Bethlehem, PA, USA.
Conducted two lectures, and assisted in making up the quizzes and final exam for a course in discrete mathematics.
Other Employment
6/1992-8/1996: Laboratory Manager of Nonlinear Electronics Laboratory, University of California, Berkeley, CA, USA.
Responsible for all aspects of operations in the Nonlinear Electronics Laboratory, including computer hardware and software support and equipment purchase.
1/1989-5/1989: Computer Programmer, Advanced Technology for Large Structural Systems (ATLSS), Lehigh University, Bethlehem, PA, USA.
Programmed part of the graphical interface of the Bridge Fatigue Investigator, an expert system for evaluating bridges developed at Lehigh University.
Experience in attracting funding and managing funded projects
Project leader of USDOT funded 3-year joint Smarter Travel Research Project with City of Dubuque. The goal of this project is to develop an end-to-end integrated system for travel data acquisition, analytics and transit route optimization. This project has been awarded a 2017 NADO Excellence in Regional Transportation Award.
Project leader of joint Research project with Ricoh Production Print Solutions (formerly IBM Printing Systems Division) on printer-related technologies from 1997 to 2012. This project has been funded internally and externally for over 10 years. I was responsible for drafting the project proposal, leading the research teams to deliver on the work items and reporting on the results.
IBM FOAK (First-of-a-kind) project with an utility company. Obtained funding for a joint project to develop algorithms to detect high impedance faults in power lines.
Awards and Honors
IEEE Region 1 Technological Innovation Award, 2013.
IBM Research Technical Accomplishment, 2005, 2009, 2013, 2017.
IBM Outstanding Research Accomplishment Award, 2013, 2017.
IBM Research Supplemental Outstanding Technical Achievement Award, 2003.
IBM Research Outstanding Technical Achievement Award, 2001.
IBM Invention Development Team Award, 2015, 2019, 2020.
Elected Fellow of Institute of Electrical and Electronics Engineers (IEEE) in 2001 at age 32.
Fellow, Asia-Pacific Artificial Intelligence Association (AAIA).
Josephine de Karman Fellowship 1993.
George C. and Helen N. Pardee Scholarship 1990.
William L. Everitt Award 1990.
Tau Beta Pi Lehigh University's chapter's prize 1987.
Member of honor societies Phi Eta Sigma, Phi Beta Kappa, and Eta Kappa Nu.
Professional Activities
Board of Governors, IEEE Circuits and Systems Society, 2010-2011.
General co-chair, IEEE International Workshop on Cellular Nanoscale Networks and Applications, 2010, 2012.
IEEE Educational Activities Board ABET Program Evaluator, 2006-present.
ABET EAC Commissioner 2018-present.
Webmaster/Social Media, IEEE Mid-Hudson section, 2011-present.
Publicity Chair, IEEE Mid-Hudson section, 2013-present.
Guest Associate Editor, International Journal of Bifurcation and Chaos, 2010-present.
Senior Editorial Board Member, IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2014-2015, 2022-2023.
Editor-in-Chief, IEEE Circuits and Systems Magazine, 2016-2019.
Deputy Editor-in-Chief, IEEE Circuits and Systems Magazine, 2014-2015.
Associate Editor, IEICE NOLTA journal, 2009-present.
Associate Editor of IEEE Transactions on Circuits and Systems, Part I, 1997-1999, 2002-2003, Part II, 2004-2005, Part I, 2006-2007.
IEEE Circuits and Systems Society Distinguished Lecturer, 2006-2007.
Organizing Committee Chair, AMS Special Session on Mathematics Through the Informational Lens, Joint Mathematics Meetings, 2022.
Organizing Committee Chair, First IBM Research Workshop on the Informational Lens, 2020.
Organizing Committee Member, IMA workshop on Optimal Control, Optimal Transport, and Data Science, 2020.
Program Committee Member, AAAI-19.
Organizing Committee Member, SIAM 2013 Annual Meeting.
Organizing Committee Member, 9th International Workshop on Complex Systems and Networks.
Organizing Committee Member, IMA Hot Topics Workshop: Mathematical and Computational Challenges in the Control, Optimization, and Design of Energy-Efficient Buildings, June 11-14, 2013.
Technical Program Committee, 2003 IEEE International Conference on Multimedia and Expo, First International Workshop on Nonlinear Dynamics and Synchronization (INDS'08).
Review Committee Member, IEEE International Symposium on Circuits and Systems, 2001, 2004, 2006, 2008, 2009, 2010, 2011, 2012, 2013.
Session Chair, IS&T's NIP: International Conference on Digital Printing Technologies, 2001, 2004, 2006, 2007, 2008.
Session Chair, IEEE International Symposium on Circuits and Systems, 2002, 2004, 2005, 2010, 2011, 2012, 2013.
Track Chair, IEEE International Symposium on Circuits and Systems, 2011.
Member, IEEE CAS Technical Committee on Nonlinear Circuits and Systems.
Member, IEEE CAS Technical Committee on Cellular Nanoscale Networks and Array Computing. (Chairman: 2009-2010)
Member, IEEE CAS Technical Committee on Sensory Systems.
Member, IEEE CAS Technical Committee on Multimedia Systems and Applications.
Member-at-Large, IEEE CEAA, 2016-2017.
Member of NSF CAREER Panel, 2002, NSF Theoretical Foundations Panel, 2006, NSF STC Panel 2011.
Digital Media Judge, Imagine Cup 2010 Finals.
Moody's Mega Math Challenge Judge, 2011-2016.
Contributor to Online Encyclopedia of Integer Sequences and Sympy development
IBM Smarter Cities Challenge, Baton Rouge, Louisiana 2014.
Reviewed papers for: 1) IEEE transactions on circuit and systems parts I and II, 2) IEEE transactions on industrial electronics, 3) International journal of circuit theory and applications, 4) International journal of bifurcation and chaos, 5) Journal of Circuits, Systems, and Computers, 6) Journal of Electronic Imaging, 7) Journal of the Franklin Institute, 8) Nonlinearity, 9) Physical Review Letters, 10) Physical Review E. 11) Physica A. 12) Discrete Mathematics
Member of
Institute of Electrical and Electronics Engineers (IEEE)
American Mathematical Society (AMS)
The Institute for Operations Research and the Management Sciences (INFORMS)
Published Computer Software
M. P. Kennedy and C. W. Wu, "ABC: Adventures in Bifurcation and Chaos", software accompanying Chua's circuit: A paradigm for Chaos (R. N. Madan, ed.), Singapore: World Scientific, 1993.
OEISsequences: Python functions to generate The On-Line Encyclopedia of Integer Sequences (OEIS) sequences. Available at: OEISsequences · PyPI
algebraic-connectivity-directed: Python functions to compute various notions of algebraic connectivity of directed graphs. Available at: algebraic-connectivity-directed · PyPI
graph-generators: Python functions to compute various classes of networkx graphs. Available at: graph-generators · PyPI
Issued Patents: 78
Patents on Computing
US patent 11,544,061, "Analog hardware matrix computation", issued January 3, 2023.
US patent 11,366,876, "Eigenvalue decomposition with stochastic optimization", issued June 21, 2022.
Patents on Digital halftoning, image processing and printing technology
US patent 9,621,762, "Halftone calibration mechanism employing an ink model", issued April 11, 2017.
US patent 9,614,998, "Mechanism for generating a hybrid halftone using a DMSSA screen", issued April 4, 2017.
US Patent 9,363,414, "Halftone mechanism", issued June 7, 2016.
US Patent 9,229,408, "Toner estimation mechanism", issued January 5, 2016.
US Patent 9,036,212, "Halftone screen generation mechanism", issued May 19, 2015.
US Patent 8,922,834, "Hybrid halftone generation mechanism using change in pixel error", issued December 30, 2014.
US Patent 8,922,802, "Method and system for halftoning using energy minimization", issued December 30, 2014.
US Patent 8,807,691, "Print head alignment mechanism", issued August 19, 2014.
US Patent 8,773,722, "Hybrid halftone generation mechanism using change in pixel error", issued July 8, 2014.
US Patent 8,693,054, "Mask generation mechanism", issued April 8, 2014.
US Patent 8,625,161, "Multibit digital halftoning, indexing 2D and 3D lookup tables", issued January 7, 2014.
US Patent 8,520,253, "Method and system for scaling with dot gain control", issued August 27, 2013.
US Patent 8,282,182, "Correction of print engine artifacts using an iterative halftoning search algorithm", issued October 9, 2012.
US Patent 7,733,533, "Generating threshold values in a dither matrix", issued June 8, 2010.
US Patent 7,616,347, "System and method for multi-bit halftoning", issued November 10, 2009.
US Patent 7,599,097, "Method and system for designing multilevel halftone screens using spot functions", issued October 6, 2009.
US Patent 7.545.537, "Bandless halftone design for multiple beam printers employing non- orthogonal halftones", issued June 9, 2009.
US Patent 7,489,419, "Method and system for specifying halftone spot shapes", issued February 10, 2009.
US Patent 7,446,904, "Methods and apparatus for generating dither mask through interpolation between preferred patterns", issued November 4, 2008.
US Patent 7,400,430, "Detecting and compensating for color misregistration produced by a color scanner", issued July 15, 2008.
US Patent 7,310,168, "Method and apparatus for controlling a spot function for digital halftoning", issued December 18, 2007.
US Patent 7,215,445, "Method and apparatus to correct distortion of document copies", issued May 8, 2007.
US Patent 6,956,670, "Method, system, program, and data structures for halftoning with line screens having different lines per inch (LPI)", issued October 18, 2005.
US Patent 6,954,290, "Method and apparatus to correct distortion of document copies", issued October 11, 2005.
US Patent 6,870,643, "Method and system for error diffusion with a plurality of error measures", issued March 22, 2005.
US Patent 6,801,220, "Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displays", issued October 5, 2004.
US Patent 6,738,162, "Digital printer for avoiding moire patterns by using a dithering mask and angular rotation between print head and print medium to simulate analog printer halftoning of color images", issued May 18, 2004.
US Patent 6,714,318, "Dithering method and apparatus for multitone printers", issued March 30, 2004.
US Patent 6,687,023, "Data processing system and method for producing shifted-element halftone screens", issued February 3, 2004.
US Patent 6,603,573, "Constrained digital halftoning", issued August 5, 2003.
US Patent 6,597,813, "Masks with modulated clustering and aperiodicity and rescaling of masks", issued July 22, 2003.
US Patent 6,515,770, "Dither mask generation with calibration-independent number of threshold levels", issued February 4, 2003.
US Patent 6,172,769, "Printer dependent descreening method", issued January 9, 2001.
US Patent 6,101,001, "Target patterns controlled error management", issued August 8, 2000.
US Patent 6,088,123, "Dithering masks with very large periods", issued July 11, 2000.
US Patent 6,055,065, "Printer independent halftone image rendering", issued April 25, 2000.
US Patent 6,025,930, "Multicell clustered mask with blue noise adjustments", issued February 15, 2000.
US Patent 6,006,011, "Target patterns controlled error management", issued December 21, 1999.
US Patent 5,946,455, "Model based error diffusion with correction propagation", issued August 31, 1999.
US Patent 5,943,477, "Microlocal calibration of digital printers", issued August 24, 1999.
US Patent 5,917,951, "Clustered aperiodic mask", issued June 29, 1999.
Patents on Digital watermarking and multimedia security
US Patent 7,333,244, "Method and system for embedding an image into two other images", issued February 19, 2008.
US Patent 7,188,258, "Method and apparatus for producing duplication- and imitation-resistant identifying marks on objects, and duplication- and duplication- and imitation-resistant objects", issued March 6, 2007.
US Patent 7,100,050, "Secured signal modification and verification with privacy control", issued August 29, 2006.
US Patent 7,006,254, "Method and system for data hiding and authentication via halftoning and coordinate projection", issued February 28, 2006.
US Patent 6,907,527, "Cryptography-based low distortion robust data authentication system and method therefor", issued June 14, 2005.
US Patent 6,834,344, "Semi-fragile watermarks", issued December 21, 2004.
US Patent 6,807,634, "Watermarks for customer identification", issued October 19, 2004.
US Patent 6,564,322, "Method and apparatus for watermarking with no perceptible trace", issued May 13, 2003.
US Patent 6,275,599, "Compressed image authentication and verification", issued August 14, 2001.
US Patent 6,256,736, "Secured signal modification and verification with privacy control", issued July 3, 2001.
Patents on Security and privacy
US Patent 8,200,982, "Semiotic system and method with privacy protection", issued June 12, 2012.
US Patent 7,761,715, "Semiotic system and method with privacy protection", issued July 20, 2010.
US Patent 6,996,543, "System for protection of goods against counterfeiting", issued February 7, 2006.
US Patent 6,982,625, "Event-recorder for transmitting and storing electronic signature data", issued January 3, 2006.
US Patent 6,873,977, "Achieving buyer-seller anonymity for unsophisticated users under collusion amongst intermediaries", issued March 29, 2005.
US Patent 6,807,530, "Method and apparatus for remote commerce with customer anonymity", issued October 19, 2004.
US patent 6,737,954, "Event-recorder for transmitting and storing electronic signature data", issued May 18, 2004.
US Patent 6,525,672, "Event-recorder for transmitting and storing electronic signature data", issued February 25, 2003.
US Patent 6,501,390, "Method and apparatus for securely determining aspects of the history of a good", issued December 31, 2002.
US Patent 6,450,403, "Method and apparatus for depositing ordinary checks from home or office", issued September 17, 2002.
US Patent 6,397,334, "Method and system for authenticating objects and object data", issued May 28, 2002.
US Patent 6,069,955, "System for protection of goods against counterfeiting", issued May 30, 2000.
Patents on various other topics
US patent 10,707,996, "Error correcting codes with Bayes decoder and optimized codebook", issued July 7, 2020.
US patent 10,586,131, "Multimedia conferencing system for determining participant engagement", issued March 10, 2020.
US Patent 9,260,031, "Distributed charging of electrical assets", issued February 16, 2016.
US Patent 8,494,004, "Resource allocation in peer-to-peer streaming", issued July 23, 2013.
US Patent 8,214,840, "Optimization with unknown objective function", issued July 3, 2012.
US Patent 8,108,537, "Method and system for improving content diversification in data driven P2P streaming using source push", issued January 31, 2012.
US Patent 7,848,355, "Resource allocation in peer-to-peer streaming", issued December 7, 2010.
US Patent 7,433,856, "Optimization with unknown objective function", issued October 7, 2008.
US Patent 6,115,616, "Hand held telephone set with separable keyboard", issued September 5, 2000.
US Patent 6,064,701, "Synchronization-based communication systems", issued May 16, 2000.
US Patent 6,028,907, "System and method for three-dimensional geometric modeling by extracting and merging two-dimensional contours from CT slice data and CT scout data", issued February 22, 2000.
US Patent 6,023,495, "System and method for acquiring three-dimensional data subject to practical constraints by integrating CT slice data and CT scout images", issued February 8, 2000.
US Patent 5,946,370, "System and method for accessing the three-dimensional geometry of large objects using X-ray based method subject to limitations on radiation doses", issued August 31, 1999
Invited Lectures, Workshop Presentations and Keynote Talks
"Trace estimation via asynchronous stochastic rounding," ICIAM Minisymposium on Stochastic Rounding for Reduced-Precision Arithmetic in Scientific Computing, August 22, 2023.
"Algorithms for Analog Arrays," AMS Special Session on Mathematics Through the Informational Lens, Joint Mathematics Meetings (JMM 2022), April 9, 2022.
"Memristive Cellular Analog Arrays for Numerical Computation," The 17 th IEEE International Workshop on Cellular Nanoscale Networks and their Applications/The 7th Memristor and Memristive Symposium (CNNA 2021) Keynote talk, September 30, 2021.
"Simplifying Deep Neural Networks via Look-up Tables and Product of Sums Matrix Factorizations," ISCAS 2020 Overview Lecture, October 17, 2020. (slides)
"Graph Laplacian Matrices as Quantum State Density Matrices and their Entanglement Properties," ACM Poughkeepsie Chapter Talk, Marist College, Poughkeepsie, New York, May 22, 2017. (slides)
"Eigenvalue bounds of matrices and control of networked dynamical systems," NYU Distributed Systems Lab Seminar, New York City, New York, May 5, 2017. (slides)
"Geometric motifs in graphs on regular grids," 2016 IEEE International Workshop on Complex Systems and Networks, Atlanta, Georgia, November 14-15, 2016. (slides)
"Levy-Desplanques, Gersgorin and Beyond: Eigenvalue Bounds and Matrix Graphs," 2015 IEEE International Workshop on Complex Systems and Networks, Perth, Australia, October 5-7, 2015. (slides)
"Global Technology Outlook 2014: Transforming industries with Systems of Insight," Systems Seminar/Ezra's Round Table, Cornell University, November 14, 2014.
"Pendant vertices in complex networks: separable graphs and control localization of weighted trees", 2014 IEEE International Workshop on Complex Systems and Networks, Shanghai, China, October 25-26, 2014. (slides)
"Control of Complex Networks of Coupled Dynamical Systems", 2012 International Workshop on Complex Systems and Networks, University of Minnesota, September 5-7, 2012.
"Locally Connected Processor Arrays for Matrix Multiplication and Linear Transforms", Seminar Series on Chaos, Control and Complex Networks, City University of Hong Kong, May 18, 2012. (slides)
"Some Aspects of Multicoverage in Sensor Networks", Wireless and Optical Communications Conference, New Jersey Institute of Technology, April 15-16, 2011.
"Can stubbornness or gullibility facilitate language formation? A study of various strategies for reaching consensus in a model of the naming game", Computer Science Colloquium, The Graduate Center, City University of New York, March 3, 2011. (slides)
"More is More: the benefits of denser sensor deployment", Hong Kong CityU-PolyU Joint Seminar Series on Chaos and Complex Networks, The Hong Kong Polytechnic University, Hong Kong, September 30, 2010. (slides)
"Some graph-theoretical criteria for control in networks of dynamical systems", Invited lecture, 2010 International Workshop on Complex Systems and Networks, Beijing, China, September 25-27, 2010. (slides)
"Transformational Hybrid Systems: The Next Generation of System Architecture", Keynote talk, 12th IEEE CNNA, International Workshop on Cellular Nanoscale Networks and their Applications, Berkeley, CA, Feb 3-5, 2010.
"Global Technology Outlook 2009" and "Synchronization and consensus in networks of coupled nonlinear circuits and systems," EECS/CASE Colloquium, Syracuse University, Oct. 14, 2009.
"Graph Laplacian Matrices and Multipartite Entanglement in Quantum Mechanics," International Workshop on Complex Systems and Networks, Bristol, United Kingdom, July 20-22, 2009. (slides)
"Sensor placement and coverage: tools from geometry and image processing," Keynote talk, MITACS Workshop on Decision Support, Information Fusion and Sensor Networks, University of Calgary, Calgary, Canada, June 18-19, 2009.
"Control and synchronization in systems coupled via a complex network," City University of Hong Kong, May 29, 2009. (slides)
"Global Technology Outlook 2008," Presentations given at Hungarian Academy of Sciences and Peter Pazmany Catholic University, Budapest, Hungary, Dec 4-5, 2008.
"Localization of forcing sites to facilitate synchronization in systems coupled via a complex network," International Workshop on Complex Systems and Networks, Canberra, Australia, Oct 1-3, 2008.
"Global Technology Outlook 2008," Keynote talk, 11th International Workshop on Cellular Neural Networks and their Applications (CNNA 2008), Santiago de Compostela, Spain, May 16, 2008.
"Digital Halftoning and Sensor Placement," BIRS Workshop on Low Complexity Dynamics, Banff , Alberta, Canada, May 29, 2008.
"Sensor Placement and Digital Halftoning," Computer Science Colloquium, The Graduate Center, City University of New York, February 28, 2008. (slides)
"Global Technology Outlook 2007," EE Dept., University of Notre Dame, October 15, 2007.
"Synchrony and consensus in complex networks: an overview," International Workshop on Complex Systems and Networks, Guilin, China, July 19, 2007.
"Identical Synchronization in Networks of Coupled Nonlinear Circuits and Systems," IEEE CAS Distinguished Lecturer Seminar, University of Calgary, Calgary, Alberta, Canada, May 11, 2007. (slides)
"Global Technology Outlook 2007: How will it affect the workplace? How can we prepare for it?," SVC Lecture Series to Envision the Workplace of the Future: Its Technology, Design, and its Challenges to Employees, Southern Vermont College, Bennington, VT, March 22, 2007.
"Algorithms for digital halftoning," The Twenty-Second Annual Mathematical Problems in Industry Workshop, Franklin W. Olin College of Engineering, Needham, MA, June 12-16, 2006.
"Some techniques for speeding up digital halftoning algorithms," BIRS workshop on Coarsely Quantized Redundant Representation of Signals, Banff , Alberta, Canada, March 11-16, 2006. (slides)
"The optimality of the greedy algorithm in Carpool and Chairman Assignment Problems," Workshop on Geometric Dynamics with Singularities, Exeter, UK, Dec 13-16, 2005.
"Synchronization and consensus in networks of systems with nonreciprocal coupling," International Workshop on Complex Systems and Networks, Hong Kong, May 20, 2005.
"The error diffusion halftoning algorithm: some stability results and applications beyond halftoning," Oversampling and Coarse Quantization for Signals Workshop, CSCAMM, University of Maryland, April 11-15, 2005. (slides)
"Halftoning, Watermarking and Scheduling: Some Applications of the Error Diffusion Algorithm," IMA/MCIM Industrial Problems Seminar, University of Minnesota, Oct. 15, 2004.
"Global Asymptotical Stability of Neural Networks with Delay," ECE Lectures Series, Polytechnic University, Sept. 30, 2004.
"Synchronization in arrays of systems coupled via a graph: time-varying, nonreciprocal and delay coupling," International workshop on nonlinear dynamics and complexity in information and communication technology, Bologna, Italy, Sept 6-8, 2004.
"Error diffusion: recent developments in theory and applications", Harmonic Analysis and Signal Processing Seminar, Courant Institute of Mathematical Sciences, New York University, Feb 11, 2004.
Publications on computing and algorithms
V. Kalantzis, M. S. Squillante, C. W. Wu, A. Gupta, S. Ubaru, T. Gokmen, L. Horesh, "Solving Sparse Linear Systems via Flexible GMRES with In-Memory Analog Preconditioning," 27th IEEE High Performance Extreme Computing Conference (HPEC), 2023.
A. Gupta, V. Kalantzis, M.S. Squillante, C.W. Wu, H. Avron, S. Ubaru, T. Gokmen, M. Rasch, T. Nowicki, L. Horesh, “Flexible GMRES with Analog Accelerators,” Supercomputing (SC), 2021 (poster).
V. Kalantzis , A. Gupta, L. Horesh , T. Nowicki, M. S. Squillante , C. W. Wu, T. Gokmen , H. Avron, "Solving sparse linear systems with approximate inverse preconditioners on analog devices ,” 25th IEEE High Performance Extreme Computing Conference (HPEC), 2021.
C. W. Wu, "Dither computing: a hybrid deterministic-stochastic computing framework," Proceedings of 28th IEEE Symposium on Computer Arithmetic (ARITH), 2021 (video).
C. W. Wu, "Locally connected processor arrays for matrix multiplication and linear transforms," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 2169-2172, 2011.
D. Coppersmith, T. Nowicki, G. Paleologo, C. Tresser and C. W. Wu, "The optimality of the online greedy algorithm in carpool and chairman assignment problems," ACM Transactions on Algorithms, vol. 7, no. 3, 2011.
Publications on machine learning and artificial intelligence
Y. Lu, M.S. Squillante, C. W. Wu, "General Markov Decision Process Framework for Directly Learning Optimal Control Policies," SIAM Conference on Control and Its Applications (CT), July 2023.
Y. Lu, M.S. Squillante, C.W. Wu, "Markov Decision Process Framework for Control-Based Reinforcement Learning", MAMA, ACM Sigmetrics, June 2023.
C. W. Wu, A. C. Wu, J. Strom, "DeepTune: robust global optimization of electronic circuit design via neuro-symbolic optimization," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), 2021.
C.W. Wu, "Simplifying Neural Networks via Look up Tables and Product of Sums Matrix Factorizations," IEEE International Symposium on Circuits and Systems (ISCAS), Sevilla, Spain, 2020.
Y. Lu, M. S. Squillante, C. W. Wu, "A Family of Robust Stochastic Operators for Reinforcement Learning," 33rd Conference on Neural Information Processing Systems (NeurIPS), Vancouver, Canada, 2019.
Publications on quantum computing
A. Dutt, E. Pednault, C. Wu, S. Sheldon, J. Smolin, L. Bishop, I. Chuang,, "Active learning of quantum system Hamiltonians yields query advantage," Physical Review Research, vol. 5, no. 3, 033060, 2023.
A. Dutt, E. Pednault, C. Wu, S. Sheldon, J. Smolin, L. Bishop, I. Chuang, "Experimental Evaluation of Active Learning of a Two Qubit Cross-Resonance Hamiltonian," APS March Meeting, 2021.
A. Dutt, E. Pednault, C. Wu, S. Sheldon, L. Bishop, J. Smolin, I. Chuang, "Active Learning of Hamiltonians," APS March Meeting, 2020.
C. W. Wu, "Graphs whose normalized Laplacian matrices are separable as density matrices in quantum mechanics," Discrete Mathematics, vol. 339, no. 4, pp. 1377-1381, 2016.
C. W. Wu, "On graphs whose Laplacian matrix's multipartite separability is invariant under graph isomorphism," Discrete Mathematics, vol. 310, no. 21, pp. 2811-2814, 2010.
C. W. Wu, "Multipartite separability of Laplacian matrices of graphs," The Electronic Journal of Combinatorics, vol. 16, no. 1, pp. R61, 2009.
C. W. Wu, "Conditions for separability in generalized Laplacian matrices and diagonally dominant matrices as density matrices," Physics Letters A, vol. 351, issues 1-2, pp. 18-22, 2006.
Publications on linear algebra and algebraic graph theory
A. J. Hoffman and C. W. Wu, "A Simple Proof of a Generalized Cauchy–Binet Theorem," American Mathematical Monthly, vol. 123, pp. 928-930, 2016.
A. Hoffman and C. W. Wu, "Geršgorin variations IV: A left eigenvector approach," Linear Algebra and its Applications, vol. 498, pp. 136-144, 2016.
D. Coppersmith and C. W. Wu, "Conditions for weak ergodicity of inhomogeneous Markov chains," Statistics and Probability Letters, vol. 78, no. 17, pp. 3082-3085, 2008.
C. W. Wu, "On some properties of contracting matrices," Linear Algebra and its Applications, vol. 428, no. 11-12, pp. 2509-2523, 2008.
C. W. Wu, "Algebraic connectivity of directed graphs," Linear and Multilinear Algebra, vol. 53, no. 3, pp. 203-223, 2005.
C. W. Wu, "On Rayleigh-Ritz ratios of a generalized Laplacian matrix of directed graphs," Linear Algebra and Its Applications, vol. 402, pp. 207-227, 2005.
C. W. Wu, "On bounds of extremal eigenvalues of irreducible and m-reducible matrices," Linear Algebra and Its Applications, vol. 402, pp. 29-45, 2005.
Publications on combinatorics, number theory, geometry and analysis
C. W. Wu, "On Rearrangement Inequalities for Triangular Norms and Co-norms in Multi-valued Logic," Logica Universalis, 2023.
C. W. Wu, "Minimal number of points on a grid forming line segments of equal length," International Journal of Geometry, vol. 12, no. 2, pp. 5-13, 2023.
C. W. Wu, "Meertens number and its variations," CONTACT: Communications on Number Theory and Combinatorial Theory, vol. 3, article 5, 2022.
C. W. Wu, "Sums of Products of Binomial Coefficients mod 2 and Run Length Transforms of Sequences," INTEGERS: Electronic Journal of Combinatorial Number Theory, vol. 22, #A81, pp. 1-15, 2022.
C. W. Wu, "On rearrangement inequalities for multiple sequences," Mathematical inequalities & applications, vol. 25, no. 2, pp. 511–534, 2022.
C. W. Wu, "On generalizations of Schur's inequality on sums of products of differences of real numbers," Linear and Multilinear Algebra, vol. 70, no. 21, pp. 6452-6467, 2022.
C. W. Wu, "Counting the number of isosceles triangles in rectangular regular grids," Forum Geometricorum, vol. 17, pp. 31-39, 2017.
C. W. Wu, "Pigeonholes and Repunits," The American Mathematical Monthly, vol. 121, no. 6, pp. 529-533, 2014.
C. W. Wu and L. O. Chua, "Quantized Sampling as Sampling with Uncertainty in Time and Amplitude," IEEE Transactions on Circuits and Systems, Part I, vol. 45, no. 4, pp. 458-463, 1998.
Publications on Cellular Neural Networks
T. Kozek, C. W. Wu, A. Zarandy, H. Chen, T. Roska, M. Kunt and L. O. Chua, "New Results and Measurements Related to Some Tasks in Object-Oriented Dynamic Image Coding Using CNN Universal Chips", IEEE Transactions on Circuits and Systems for Video Technology, vol. 7, no. 4, pp. 606-614, 1997.
C. W. Wu and L. O. Chua, "A More Rigorous Proof of Complete Stability of Cellular Neural Networks," IEEE Transactions on Circuits and Systems, Part I, vol. 44, no. 4, pp. 370-371, 1997.
T. Yang, L. B. Yang, C. W. Wu, and L. O. Chua, "Fuzzy cellular neural networks: applications," Fourth IEEE International Workshop on Cellular Neural Networks and their Applications, Seville, Spain, pp. 225-230, 1996.
T. Yang, L. B. Yang, C. W. Wu, and L. O. Chua, "Fuzzy cellular neural networks: theory," Fourth IEEE International Workshop on Cellular Neural Networks and their Applications, Seville, Spain, pp. 181-186, 1996.
T. Roska, C. W. Wu, and L. O. Chua, "Stability of cellular neural networks with dominant nonlinear and delay-type templates," IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, vol. 40, pp. 270-272, Apr. 1993.
L. O. Chua and C. W. Wu, "On the universe of stable cellular neural networks," International Journal of Circuit Theory and Applications, vol. 20, no. 5, pp. 497-517, 1992.
C. W. Wu, L. O. Chua, and T. Roska, "A two-layer radon transform cellular neural network," IEEE transactions on circuits and systems-II: Analog and Digital Signal Processing, vol. 39, pp. 488-489, July 1992.
T. Roska, C. W. Wu, M. Balsi, and L. O. Chua, "Stability and dynamics of delay-type general and cellular neural networks," IEEE transactions on circuits and systems-I: Fundamental theory and applications, vol. 39, pp. 487-490, June 1992.
Publications on digital halftoning and image processing
K. Chandu, M. Stanich, C. W. Wu, B. Trager, "Direct binary search (DBS) algorithm with constraints," Proceedings of IS& T/SPIE Electronic Imaging, pp. 86520K-86520K, 2013.
B. Trager, K. Chandu, C. W. Wu, M. Stanich, "A GPU based implementation of direct multi-bit search (DMS) screen algorithm," Proceedings of IS& T/SPIE Electronic Imaging, pp. 86650Z- 86550Z, 2013.
K. Chandu, M. Stanich, B. Trager, C. W. Wu, "A GPU implementation of color digital halftoning using the Direct Binary Search algorithm," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 185-188, 2012.
K. Chandu, M. Stanich, C. W. Wu, B. Trager, "Direct multi-bit search (DMS) screen algorithm," Proceedings of 19th IEEE International Conference on Image Processing (ICIP), pp. 817-820, 2012.
B. Trager, C. W. Wu, M. Stanich, K. Chandu, "GPU-enabled parallel processing for image halftoning applications," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 1528-1531 , 2011.
S. Bhatt, J. Sabino, J. Harlim, J. Lepak, R. Ronkese and C. W. Wu, "Comparative study of search strategies for the direct binary search image halftoning algorithm," Proceedings of NIP 22: IS&T's International Conference on Digital Printing Technologies, Denver, CO, pp. 244-247, 2006.
C. W. Wu, M. Stanich, H. Li, Y. Qiao and L. Ernst, "Fast error diffusion and digital halftoning algorithms using look-up tables," Proceedings of NIP 22: IS&T's International Conference on Digital Printing Technologies, Denver, CO, pp. 240-243, 2006.
L. Ernst, C. W. Wu, Y. Qiao and M. Stanich, "An interpolation approach in print quality enhancement (PQE) feature determination," Proceedings of Beijing International Conference on Imaging: Technology and Applications for the 21st Century, Beijing, China, 2005.
C. W. Wu, "Error diffusion: recent developments in theory and applications (Focal Paper),"Proceedings of NIP 20: IS&T's International Conference on Digital Printing Technologies, Salt Lake City, UT, pp. 642-646, 2004.
D. Chevion, E. Karnin, G. Thompson, A. Tzadok, C. W. Wu, "Document Segmentation with Application for the Book Publishing Industry," TAGA 2004.
C. W. Wu, G. Thompson, M. Stanich, "A unified framework for digital halftoning and dither mask construction: variations on a theme and implementation issues (Focal Paper)," NIP 19: IS&T's International Conference on Digital Printing Technologies, New Orleans, LA, pp. 793-796, 2003.
R. L. Adler, B. P. Kitchens, M. Martens, C. P. Tresser and C. W. Wu, "The Mathematics of Halftoning," IBM Journal of Research and Development, vol. 47, no. 1, pp. 5-15, 2003.
S. L. Wright, S. Millman, C. W. Wu , P. F. Greier, K. Yamauchi, K. Numano, K. Sumiyoshi, "Color and luminance management for high-resolution liquid-crystal displays", SID 2003, Baltimore, MD, 2003.
J. Q. Trelewicz, D. Dittrich, Y. Qiao, C. W. Wu, G. Thompson, "Shape-changing spot function for digital clustered-dot halftoning," NIP18: IS&T's International Conference on Digital Printing Technologies, San Diego, CA, 2002.
J. L. Mitchell, G. Thompson, C. W. Wu, T. J. Trenary, Y. Qiao, "Multilevel Color Halftoning," The 9th Color Imaging Conference, Scottsdale, AZ, 2001.
C. W. Wu, C. P. Tresser, G. R. Thompson, M. J. Stanich, "Supercell dither masks with constrained blue noise interpolation," IS&T's NIP17: International Conference on Digital Printing Technologies, Fort Lauderdale, FL, 2001, pp. 487-490.
R. L. Adler, B. Kitchens, M. Martens, A. Nogueira, C. P. Tresser and C. W. Wu, "Error bounds for error diffusion and related digital halftoning algorithms," IEEE International Symposium on Circuits and Systems, Sydney, Australia, 2001, pp. II-513-516.
R. L. Adler, B. Kitchens, M. Martens, A. Nogueira, C. P. Tresser and C. W. Wu, "Error bounds for error diffusion and other mathematical problems arising in digital halftoning," IS&T/SPIE's International Symposium on Electronic Imaging: Science and Technology, San Jose, CA, vol. 3963, pp. 437-443, 2000.
Publications on digital watermarking and steganography
C. W. Wu, G. Thompson and M. Stanich, "Digital Watermarking and Steganography via Overlays of Halftone Images," SPIE 49th Annual Meeting, Denver, CO, Proceedings of SPIE, vol. 5561, pp. 152-163, 2004.
C. W. Wu, G. Thompson, S. L. Wright, "Multiple Images Viewable on Twisted-Nematic Mode Liquid Crystal Displays," IEEE Signal Processing Letters, vol. 10, no. 8, pp. 225-227, 2003 (video).
D. Zou, C. W. Wu, G. Xuan, and Y-Q. Shi, "A content based image authentication system with lossless data hiding", 2003 IEEE International Conference on Multimedia and Expo, Baltimore, MD, 2003.
C. W. Wu, "On the Design of Content-based Multimedia Authentication Systems", IEEE Transactions on Multimedia, vol. 4, no. 3, pp. 385-393, 2002.
C. W. Wu, "Multimedia Data Hiding and Authentication via Halftoning and Coordinate Projection," EURASIP Journal on Applied Signal Processing, vol. 2002, no. 2, pp. 143-151, 2002.
G. W. Braudaway, F. Mintzer, J. M. Socolofsky, C. Tresser, C. W. Wu, "Application of invisible image watermarks to produce remotely printed, duplication resistant, and demonstrably authentic documents," IS&T/SPIE's International Symposium on Electronic Imaging: Science and Technology, San Jose, CA, vol. 4314, pp. 351-359, 2001.
C. W. Wu, "Limitations and requirements of content-based multimedia authentication systems," IS&T/SPIE's International Symposium on Electronic Imaging: Science and Technology, San Jose, CA, vol. 4314, pp. 241-252, 2001.
D. Coppersmith, F. Mintzer, C. Tresser, C. W. Wu, and M. M. Yeung, "Fragile Imperceptible Digital Watermark with Privacy Control," IS&T/SPIE's International Symposium on Electronic Imaging: Science and Technology, San Jose, CA, vol. 3657, pp. 79-84, 1999.
Publications on sensor placement
M. P. Johnson, D. Sarioz, A. Bar-Noy, T. Brown, D. Verma, and C. W. Wu, "More is more: The benefits of denser sensor deployment," ACM Transactions on Sensor Networks, vol. 8, no. 3, pp 1–19, 2012.
D. Verma, C. W. Wu, T. Brown, A. Bar-Noy, S. Shamoun, M. Nixon, "Application of halftoning algorithms to location dependent sensor placement," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 161-164, 2009.
M. P. Johnson, D. Sarioz, A. Bar-Noy, T. Brown, D. Verma, and C. W. Wu, "More is more: Robust and efficient coverage in denser sensor deployment," Proceedings of the 28th IEEE Conference on Computer Communications (INFOCOM), pp. 379-387, 2009.
A. Bar-Noy, T. Brown, M. P. Johnson, D. Sarioz, D. Verma, C. W. Wu, "More is more: the benefits of dense sensor deployment," Proceedings of 5th IEEE International Conference on Mobile Ad Hoc and Sensor Systems (MASS), pp. 514-515, 2008.
D. C. Verma, C. W. Wu, T. Brown, A. Bar-Noy, S. Shamoun, M. Nixon, "Location dependent heuristics for sensor coverage planning," Proceedings of SPIE, vol. 6981, pp. 69810B-1-B-7, 2008.
C. W. Wu and D. Verma, "A sensor placement algorithm for redundant covering based on Riesz energy minimization," Proceedings of IEEE International Symposium on Circuits and Systems, Seattle, WA, pp. 2074-2077, 2008.
Publications on peer-to-peer data distribution
H. Zhao, D. Smilkov, P. Dettori, J. Nogima, F. A. Schaffa, P. Westerink, C. W. Wu, "A Feasibility Study of Collaborative Stream Routing in Peer-to-Peer Multiparty Video Conferencing," Proceedings of IEEE International Symposium on Multimedia (ISM), 2011.
D. Smilkov, H. Zhao, P. Dettori, J. Nogima, F. A. Schaffa, P. Westerink, C. W. Wu, "Non-intrusive Adaptive Multimedia Routing in Peer-to-Peer Multiparty Video Conferencing," Proceedings of IEEE International Symposium on Multimedia (ISM), pp. 105-112, 2010.
C. Liang, Z. Fu, Y. Liu, C. W. Wu, "Incentivized Peer-assisted Streaming for On-demand Services," IEEE Transactions on Parallel & Distributed Systems, vol. 21, no. 9, pp. 1354-1367, 2010.
L. Chism, X. He, L. Huang, A. Ibrahim, C. Jones, Y. Shu, C. W. Wu, Z. Fu, "Performance study of peer-to-peer video streaming on complex networks," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 1613-1616, 2009.
C. Liang, Z. Fu, Y. Liu, and C. W. Wu, "iPASS: Incentivized Peer-assisted System for Asynchronous Streaming," Proceedings of 28th IEEE Conference on Computer Communications (INFOCOM) Mini-Conference, pp. 2741-2745, 2009.
Z. Fu, C. W. Wu, J.-J. Jeng, H. Lei, "PACTS: A Service Oriented Architecture for Real-Time Peer- Assisted Content Delivery Service," Proceedings of 32nd Annual IEEE International Computer Software and Applications Conference, pp. 1205-1210, 2008.
Publications on control, synchronization, consensus and dynamics in networks of coupled systems
H. Liu, S. Zhang, C. W. Wu, X. Wu, Z. Li and J. Xu, "Intralayer Synchronization in Heterogeneous Multiplex Dynamical Networks Based on Spectral Graph Theory," IEEE Journal on Emerging and Selected Topics in Circuits and Systems, vol. 13, no. 3, pp. 646-657, 2023.
Y. Tian, A. Sridhar, C. W. Wu, S. A. Levin, K. M. Carley, H. V. Poor, and O. Yağan, "The Role of Masks in Mitigating Viral Spread on Networks ," Physical Review E, vol. 108, no. 1, 014306, 2023.
M. Sood, A. Sridhar, R. Eletreby, C. W. Wu, S. A. Levin, O. Yağan. H. V. Poor, "Spreading processes with mutations over multilayer networks," Proceedings of the National Academy of Sciences of the United States of America (PNAS), vol. 120, no. 24, e2302245120, 2023.
M. Sood, R. Eletreby, S. Kumar, C. W. Wu, O. Yagan, "The Interplay of Clustering and Evolution in the Emergence of Epidemics on Networks," IEEE International Conference on Communications, 2023.
C. W. Wu, "Synchronization in dynamical systems coupled via multiple directed networks," IEEE Transactions on Circuits and Systems-II: Express Briefs, vol. 68, no. 5, pp. 1660-1664, 2021.
C. W. Wu, "Synchronization in dynamical systems coupled via multiple directed networks," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), 2021.
R. Bapat, C. W. Wu, "Control Localization in Networks of Dynamical Systems Connected via a Weighted Tree," IEEE Transactions on Systems, Man, and Cybernetics: Systems, vol. 47, no. 11, pp. 3030-3036, 2017.
H. Liu, M. Cao, C. W. Wu, "Graph comparison and synchronization in complex networks," in Oscillator Circuits: Frontiers in Design, Analysis and Applications, IET Materials, Circuits and Devices Series 32, (Y. Nishio ed.), pp. 183-207, 2016.
H. Liu, M. Cao, C. W. Wu, J-A. Lu, C. K. Tse, "Synchronization in Directed Complex Networks Using Graph Comparison Tools," IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 62, no. 4, pp. 1185-1194, 2015.
H. Liu, M. Cao, C. W. Wu, "Coupling Strength Allocation for Synchronization in Complex Networks Using Spectral Graph Theory," IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 61, no. 5, pp. 1520-1530, 2014.
H. Liu, M. Cao, C. W. Wu, "New spectral graph theoretic conditions for synchronization in directed complex networks," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 2307-2310, 2013.
H. Liu, M. Cao, C. W. Wu, "Graph comparison and its application in network synchronization," IEEE European Control Conference, pp. 3809-3814, 2013.
C. W. Wu, "Control of Networks of Coupled Dynamical Systems," in Consensus and Synchronization in Complex Networks, pp. 23-50, Springer, 2013.
B. Alzalg, C. Anghel, W. Gan, Q. Huang, M. Rahman, A. Shum, C. W. Wu, "Contingency constrained optimal power flow solutions in complex network power grids," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 1636-1639, 2012.
C. W. Wu, "Can stubbornness or gullibility lead to faster consensus? A study of various strategies for reaching consensus in a model of the naming game," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 2111-2114, 2011.
C. W. Wu, "Evolution and Dynamics of Complex Networks of Coupled Systems," IEEE Circuits and Systems Magazine, vol. 10, no. 3, pp. 55-63, 2010.
C. W. Wu, "On control of networks of dynamical systems," Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), pp. 3785-3788, 2010.
C. W. Wu, "On the relationship between pinning control effectiveness and graph topology in complex networks of dynamical systems," Chaos, vol. 18, no. 3, pp. 037103, 2008.
C. W. Wu, "Localization of effective pinning control in complex networks of dynamical systems," Proceedings of IEEE International Symposium on Circuits and Systems, Seattle, WA, pp. 2530- 2533, 2008.
M. Cao and C. W. Wu, "Topology design for fast convergence of network consensus algorithms," Proceedings of IEEE International Symposium on Circuits and Systems, Louisiana, LA, pp. 1029- 1032, 2007.
C. W. Wu, "On two approaches to analyzing consensus in complex networks," Proceedings of IEEE International Symposium on Circuits and Systems, Louisiana, LA, pp. 2638-2641, 2007.
C. W. Wu, "Synchronization and Convergence of Linear Dynamics in Random Directed Networks," IEEE Transactions on Automatic Control, vol. 51, no. 7, pp. 1207-1210, 2006.
C. W. Wu, "On a matrix inequality and its application to the synchronization in coupled chaotic systems," Complex Computing-Networks: Brain-like and Wave-oriented Electrodynamic Algorithms, Springer Proceedings in Physics, vol. 104, pp. 279-288, 2006.
C. W. Wu, "Synchronizability of networks of chaotic systems coupled via a graph with a prescribed degree sequence," Physics Letters A, vol. 346, issue 4, pp. 281-287, 2005.
C. W. Wu, "Synchronization in Arrays of Coupled Nonlinear Systems With Delay and Nonreciprocal Time-Varying Coupling," IEEE Transactions on Circuits and Systems-II, vol. 52, no. 5, pp. 282-286, 2005.
C. W. Wu, "Synchronization in networks of nonlinear dynamical systems coupled via a directed graph," Nonlinearity, vol. 18, pp. 1057-1064, 2005.
C. W. Wu, "Synchronization in an array of chaotic systems coupled via a directed graph," Proceedings of IEEE International Symposium on Circuits and Systems, Kobe, Japan, pp. 6046-6049, 2005.
C. W. Wu, "Agreement and consensus problems in groups of autonomous agents with linear dynamics," Proceedings of IEEE International Symposium on Circuits and Systems, Kobe, Japan, pp.292-295, 2005.
C. W. Wu, "Synchronization in Systems Coupled via Complex Networks," Proceedings of IEEE International Symposium on Circuits and Systems, Vancouver, Canada, pp. IV-724-727, 2004.
C. W. Wu, "Perturbation of coupling matrices and its effect on the synchronizability in arrays of coupled chaotic systems," Physics Letters A, vol. 319, issues 5-6, pp. 495-503, 2003.
C. W. Wu, "Synchronization in Coupled Arrays of Chaotic Oscillators with Nonreciprocal Coupling," IEEE Transactions on Circuits and Systems-I, vol. 50, no. 2, pp. 294-297, 2003.
C. W. Wu, "On Three Oscillator Universal Probes for Determining Synchronization Stability in Arrays of Coupled Oscillators", International Journal of Bifurcation and Chaos, vol. 12, no. 10, pp.2233-2238, 2002.
C. W. Wu, "Synchronization in Arrays of Coupled Nonlinear systems: Passivity, Circle Criterion and Observer Design", IEEE Transactions on Circuits and Systems, Part I, vol. 48, no. 10, pp. 1257-1261, 2001.
C. W. Wu, "Synchronization in arrays of coupled nonlinear systems: passivity, circle criterion and observer design," IEEE International Symposium on Circuits and Systems, Sydney, Australia, 2001, pp.III-692-695.
C. W. Wu, "Simple three oscillator universal probes for determining synchronization stability in coupled arrays of oscillators," IEEE International Symposium on Circuits and Systems, Sydney, Australia, 2001, pp. III-261-264.
C. W. Wu, "Synchronization in Arrays of Chaotic Circuits Coupled via Dynamic Coupling Elements," International Journal of Bifurcation and Chaos, vol. 10, no. 4, pp. 819-827, 2000.
C. W. Wu, "Synchronization in Arrays of Coupled Chaotic Circuits and Systems: Theory and Applications," in Controlling Chaos and Bifurcations in Engineering Systems (G. Chen ed.), CRC Press, Boca Raton, 1999.
C. W. Wu, "Graph Coloring via Synchronization of Coupled Oscillators," IEEE Transactions on Circuits and Systems, Part I, vol. 45, no. 9, pp. 974-978, 1998.
C. W. Wu, "Global synchronization in coupled map lattices," 1998 IEEE International Symposium of Circuits and Systems, Monterey, CA, pp. III-302-305, 1998.
C. W. Wu, "Synchronization in an array of chaotic circuits coupled via hypergraphs: static and dynamic coupling," 1998 IEEE International Symposium of Circuits and Systems, Monterey, CA, pp.III-287-290, 1998.
N. Balmforth, C. Tresser, P. Worfolk and C. W. Wu, "Master-slave Synchronization and the Lorenz Equations," CHAOS, vol. 7, no. 3, pp. 392-394, 1997.
L. O. Chua, T. Yang, G-Q. Zhong and C. W. Wu, "Synchronization of Chua's Circuits with Time- Varying Channels and Parameters," IEEE Transactions on Circuits and Systems, Part I, vol. 43, no. 10, pp. 862-868, 1996.
C. W. Wu, G.-Q. Zhong and L. O. Chua, "Synchronizing nonautonomous chaotic systems without phase-locking," Journal of Circuits, Systems, and Computers, vol. 6, no. 3, pp. 227-241, 1996.
C. W. Wu, T. Yang, and L. O. Chua, "On Adaptive Synchronization and Control of Nonlinear Dynamical Systems," International Journal of Bifurcation and Chaos, vol. 6, no. 3, pp. 455-471, 1996.
C. W. Wu and L. O. Chua, "On a conjecture regarding the synchronization in an array of linearly coupled dynamical systems," IEEE Transactions on Circuits and Systems, Part I, vol. 43, no. 2, pp.161-165, 1996.
L. O. Chua, T. Yang, G-Q. Zhong and C. W. Wu, "Adaptive synchronization of Chua's oscillators," International Journal of Bifurcation and Chaos, vol. 6, no. 1, pp. 189-201, 1996.
C. W. Wu and L. O. Chua, "Application of Kronecker products to the analysis of systems with uniform linear coupling," IEEE Transactions on Circuits and Systems, Part I, vol. 42, no. 10, pp.775-778, October 1995.
C. W. Wu and L. O. Chua, "Application of graph theory to the synchronization in an array of coupled nonlinear oscillators," IEEE Transactions on Circuits and Systems, Part I, vol. 42, pp.494-497, August 1995.
C. W. Wu and L. O. Chua, "Synchronization in an array of linearly coupled dynamical systems," IEEE Transactions on Circuits and Systems, Part I, vol. 42, pp. 430-447, August 1995.
G-Q. Zhong, C. W. Wu, and L. O. Chua, "Bi-directional secure communication via synchronized Chua's circuits," Proceedings of the 1995 International Symposium on Nonlinear Theory and its Applications (NOLTA '95), Las Vegas, USA, pp. 141-144, 1995.
C. W. Wu and L. O. Chua, "A unified framework for synchronization and control of dynamical systems," International Journal of Bifurcation and Chaos, vol. 4, no. 4, pp. 979-998, 1994.
C. W. Wu and L. O. Chua, "A simple way to synchronize chaotic systems with applications to secure communication systems," International Journal of Bifurcation and Chaos, vol. 3, no. 6, pp. 1619-1627, 1993 (video).
Publications on autonomic computing and decentralized optimization
S. Lu and C. W. Wu, "Decentralized Stochastic Non-convex Optimization over Weakly Connected Time-varying Digraphs," Proc. 45th International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2020.
T. Nowicki, M. S. Squillante and C. W. Wu, "Fundamentals of Dynamic Decentralized Optimization in Autonomic Computing Systems," in Self-star Properties in Complex Information Systems: Conceptual and Practical Foundations, (O. Babaoglu, M. Jelasity, A. Montresor, et al. eds), Lecture Notes in Computer Science, Hot Topics, vol. 3460, pp. 204-218, Springer-Verlag, 2005.
Y. Diao, C. W. Wu, J. L. Hellerstein, A. J. Storm, M. Surendra, S. Lightstone, S. Parekh, C. Garcia-Arellano, M. Carroll, L. Chu, and J. Colaco, "Comparative Studies of Load Balancing With Control and Optimization Techniques," Proceedings of American Control Conference, 2005.
T. Nowicki, M. S. Squillante and C. W. Wu, "Fundamentals of Decentralized Optimization in Autonomic Systems," International Workshop on Self-* Properties in Complex Information Systems, Bologna, Italy, 2004.
Publications on chaotic and nonlinear dynamics
Y. Lu, M. S. Squillante, and C. W. Wu, "On the control of density-dependent stochastic population processes with time-varying behavior," Automatica, vol. 153, 111023, 2023.
Y. Lu, M. S. Squillante, and C. W. Wu, "Control of Time-Varying Epidemic-Like Stochastic Processes and Their Mean-Field Limits," 2018 Annual American Control Conference (ACC), pp. 6602-6607, 2018.
Y. Lu, M. S. Squillante, and C. W. Wu, "Nearly Completely Decomposable Epidemic-Like Stochastic Processes with Time-Varying Behavior," ACM SIGMETRICS Performance Evaluation Review, vol. 45, no. 2, pp. 48-50, 2017.
Y. Lu, S. T. Maguluri, M. S. Squillante, and C. W. Wu, "On optimal portfolios of dynamic resource allocations," 2017 Annual American Control Conference (ACC), pp. 2447-2452, 2017.
Y. Lu, S. T. Maguluri, M. S. Squillante, and C. W. Wu, "Risk-based dynamic allocation of computing resources," ACM SIGMETRICS Performance Evaluation Review, vol. 44, no. 2, pp. 27-29, 2016.
Y. Lu, M. S. Squillante, C. W. Wu and B. Zhang, "On the Control of Epidemic-Like Stochastic Processes with Time-Varying Behavior," ACM SIGMETRICS Performance Evaluation Review, vol. 43, no. 2, pp. 78-80, 2015.
C. W. Wu, "Nonlinear Electronics Laboratory (NOEL): A Reminiscence," Chaos, CNN, Memristors and Beyond: A Festschrift for Leon Chua, pp. 124-134, World Scientific, 2013.
Y. S. Huang and C. W. Wu, "A unifying proof of global asymptotical stability of neural networks with delay," IEEE Transactions on Circuits and Systems-II, vol. 52, no. 4, pp. 181-184, 2005.
C. W. Wu, Y. S. Huang, "A Unifying Proof of Global Asymptotical Stability of Neural Networks with Delay," Proceedings of IEEE International Symposium on Circuits and Systems, Vancouver, Canada, pp. III-65-68, 2004.
C. W. Wu, "On Nonlinear Dynamical Systems Topologically Conjugate to Jerky Motion via a Linear Transformation," Physics Letters A, vol. 296, no. 2-3, pp. 105-108, 2002.
N. J. Balmforth, A. Provenzale, E. A. Spiegel, M. Martens, C. Tresser, C. W. Wu, "Red Spectra from White and Blue Noise", Proceedings of the Royal Society: Biological Sciences, vol. 266, no. 1416, pp. 311, 1999.
G.-Q. Zhong, C. W. Wu and L. O. Chua, "Torus-Doubling Bifurcations in Four Mutually Coupled Chua's Circuits," IEEE Transactions on Circuits and Systems, Part I, vol. 45, no. 2, pp. 186-193, 1998.
T. Yang, C. W. Wu and L. O. Chua, "Cryptography Based on Chaotic Systems," IEEE Transactions on Circuits and Systems, Part I, vol. 44, no. 5, pp. 469-472, 1997.
M. Itoh, C. W. Wu, and L. O. Chua, "Communication Systems via Chaotic Signals from a Reconstruction Viewpoint," International Journal of Bifurcation and Chaos, vol. 7, no. 2, pp. 275-286, 1997.
L. Pivka, C. W. Wu, and A. Huang, "Lorenz Equation and Chua's Equation," International Journal of Bifurcation and Chaos, vol. 6, no. 12B, pp. 2443-2489, 1996.
C. W. Wu and L. O. Chua, "On a variation of the Huberman-Lumer adaptive scheme," International Journal of Bifurcation and Chaos, vol. 6, no. 7, pp. 1397-1407, 1996.
C. W. Wu and L. O. Chua, "On the generality of the unfolded Chua's circuit," International Journal of Bifurcation and Chaos, vol. 6, no. 5, pp. 801-832, 1996.
Yu. V. Andreyev, A. S. Dmitriev, D. A. Kuminov, L. O. Chua and C. W. Wu, "1-D maps, chaos and neural networks for information processing," International Journal of Bifurcation and Chaos, vol. 6, no. 4, pp. 627-646, 1996.
L. Kocarev, C. W. Wu and L. O. Chua, "Complex behavior in digital filters with over ow nonlinearity: Analytical results," IEEE Transactions on Circuits and Systems, Part II, vol. 43, no. 3, pp. 234-246, 1996.
C. W. Wu and L. O. Chua, "On linear topological conjugacy of Lur'e systems," IEEE Transactions on Circuits and Systems, Part I, vol. 43, no. 2, pp. 158-161, 1996.
L. Pivka, C. W. Wu, and L. O. Chua, "Chua's circuit: chaotic phenomena and applications," in Nonlinear Dynamics in Circuits (T. Carroll and L. Pecora, eds.), pp. 265-300, World Scientific, Singapore, 1995.
V. C. Anishchenko, T. E. Vadivasova, V. V. Astakhov, O. V. Sosnovtseva, C. W. Wu and L. O. Chua, "Dynamics of two coupled Chua's circuits," International Journal of Bifurcation and Chaos, vol. 5, no. 6, pp. 1677-1699, 1995.
V. C. Anishchenko, T. E. Vadivasova, D. E. Postnov, O. V. Sosnovtseva, C. W. Wu and L. O. Chua, "Dynamics of the nonautonomous Chua's circuit," International Journal of Bifurcation and Chaos, vol. 5, no. 6, pp. 1525-1540, 1995.
L. O. Chua, L. Pivka and C. W. Wu, "A universal circuit for studying chaotic phenomena," Phil. Trans. Royal Society London A, vol. 353, pp. 65-84, 1995.
C. W. Wu and L. O. Chua, "Finding parameters for Chua's oscillator which is topologically conjugate to systems with a scalar nonlinearity," International Journal of Bifurcation and Chaos, vol. 5, no. 3, pp. 895-899, 1995.
L. Pivka, A. L. Zheleznyak, C. W. Wu and L. O. Chua, "On the generation of scroll waves in a three-dimensional discrete active medium," International Journal of Bifurcation and Chaos, vol. 5, no. 1, pp. 313-320, 1995.
L. Pivka, C. W. Wu and A. Huang, "Chua's Oscillator: a compendium of chaotic phenomena," Journal of the Franklin Institute, vol. 331B, no. 6, pp. 705-741, November 1994.
C. W. Wu and L. O. Chua, "Symbolic dynamics of piecewise-linear maps," IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, vol. 41, pp. 420-424, June 1994.
L. Kocarev, C. W. Wu, L. O. Chua, Z. Galias, and M. Ogorzalek, "Chaos in digital filters: a global picture," in Systems and Networks: Mathematical Theory and Applications, Proceedings of the International Symposium MNTS '93, Regensburg, Germany, August 2-6, 1993 (U. Helmke, R. Mennicken, and J. Saurer, eds.), pp. 287-290, Akademie Verlag, Berlin, 1994.
C. W. Wu and L. Pivka, "From Chua's circuit to Chua's oscillator: A picture book of attractors," in Nonlinear Dynamics of Electronic Systems: Proceedings of the Workshop NDES '93, Dresden, Germany, 23-24 July 1993 (W. Schwarz and A. C. Davis, eds.), pp. 15-79, World Scientific, Singapore, 1994.
C. W. Wu and N. F. Rul'kov, "Studying chaos via 1-d maps a tutorial," IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, vol. 40, pp. 707-721, Oct. 1993.
L. O. Chua, C. W. Wu, A. Huang, and G.-Q. Zhong, "A universal circuit for studying and generating chaos part I: Routes to chaos," IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, vol. 40, pp. 732-744, Oct. 1993.
L. O. Chua, C. W. Wu, A. Huang, and G.-Q. Zhong, "A universal circuit for studying and generating chaos part II: Strange attractors," IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, vol. 40, pp. 745-761, Oct. 1993.
R. N. Madan and C. W. Wu, "Introduction to experimental chaos using Chua's circuit," in Chua's circuit: A paradigm for Chaos (R. N. Madan, ed.), pp. 59-89, Singapore: World Scientific, 1993.
K. S. Halle, C. W. Wu, M. Itoh, and L. O. Chua, "Spread spectrum communication through modulation of chaos," International Journal of Bifurcation and Chaos, vol. 3, no. 2, pp. 223-239, 1993.
M. P. Kennedy, C. W. Wu, S. Pau, and J. Tow, "Digital signal processor-based investigation of Chua's circuit family," Journal of Circuits, Systems, and Computers, vol. 3, no. 2, pp. 269-292, 1993.
C. W. Wu and L. O. Chua, "Properties of admissible symbolic sequences in a second-order digital filter with overflow non-linearity," International Journal of Circuit Theory and Applications, vol. 21, no. 3, pp. 299-307, 1993.
Y. V. Andreyev, A. Dmitriev, L. O. Chua, and C. W. Wu, "Associative and random access memory using one-dimensional maps," International Journal of Bifurcation and Chaos, vol. 2, no. 3, pp. 483-504, 1992.
Publications on circuit tuning and circuit theory
C. W. Wu, "Qualitative Analysis of Dynamic Circuits," in Encyclopedia of Electrical and Electronics Engineering (J. Webster ed.), John Wiley & Sons, New York, 1999.
L. O. Chua, C. W. Wu, G. Q. Zhong, L. F. Liu, "Synthesizing Arbitrary Driving-Point and Transfer Characteristics," IEEE Transactions on Circuits and Systems, Part I, vol. 45, no. 12, pp. 1225-1232, 1998.
A. R. Conn, P. K. Coulman, R. A. Haring, G. L. Morrill, C. Visweswariah, C. W. Wu, "JiffyTune: Circuit Optimization Using Time-Domain Sensitivities," IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, vol. 17, no. 12, pp. 1292-1309, 1998.
A. R. Conn, R. A. Haring, C. Visweswariah, and C. W. Wu, "Circuit optimization via adjoint Lagrangians," 1997 IEEE/ACM International Conference on Computer Aided Design, pp. 281-288, 1997.
Publications on privacy preserving data mining
C. W. Wu, "Privacy preserving data mining with unidirectional interaction," Proceedings of IEEE International Symposium on Circuits and Systems, Kobe, Japan, pp. 5521-5524, 2005.
C. W. Wu, "Privacy Preserving Data Mining: a signal processing perspective and a simple data perturbation protocol," 2nd Workshop on Privacy Preserving Data Mining, IEEE International Conference on Data Mining, Melbourne, FL, 2003.
Publications on 3D visualization of medical data
J. Y. Margulies, R. L. Adler, A. D. Kalvin, M. Martens, M. Shub, C. P. Tresser, C. W. Wu, "Deforming Factors in Idiopathic Scoliosis: a Mathematical Tool," SPINE: State of the Art Reviews, vol. 14, no. 2, pp. 505-509, May 2000.
J. Y. Margulies, R. Adler, M. Martens, A. Kalvin, M. Shub, C. Tresser, C. W. Wu, and N. Haramati, "3D visualization of the spine, data acquisition and radiation dosage," American Academy of Orthopaedic Surgeons, 67th Annual Meeting, Orlando, FL, 2000.
A. D. Kalvin, R. L. Adler, J. Y. Margulies, C. P. Tresser, and C. W. Wu, "3D visualization of the scoliotic spine: longitudinal studies, data acquisition, and radiation dosage constraints," SPIE's International Symposium on Medical Imaging, San Diego, CA, 1999.
Books and Monographs
C. W. Wu, "Synchronization in complex networks of nonlinear dynamical systems," World Scientific, Singapore, 2007.(Table of Contents, Chapter 1, Appendices, Bibliography, Index, Errata)
C. W. Wu, "Synchronization in coupled chaotic circuits and systems," World Scientific, Singapore, 2002. (Table of Contents, Chapter 1, Appendices, Bibliography, Index)