Chai Wah Wu

Title

Principal Research Staff Member

Bio

I am currently a principal research staff member in the Exploratory Math Sciences group developing innovative solutions for AI, modeling of complex processes and data analytics. Previously I have managed the Intelligent Energy Management group, the Distributed Digital Media Infrastructure group and the Foundations of Mathematics group.

Research interests

Foundations of nonlinear circuits & systems theory
Dynamics in coupled networks of oscillators
Synchronization of chaos
Application of chaos to information processing
Distributed video streaming
Digital halftoning
Document and multimedia security
Algebraic graph theory
Logic and Machine Learning

Education

Ph.D. electrical engineering, University of California, Berkeley, CA, USA, 1995.
M.A. mathematics, University of California, Berkeley, CA, USA, 1994.
M.S. electrical engineering, University of California, Berkeley, CA, USA, 1991.
B.S. computer engineering, Lehigh University, Bethlehem, PA, USA, 1990.
B.A. cognitive science, Lehigh University, Bethlehem, PA, USA, 1990.

Professional activities, Awards and Honors

Fellow, IEEE.
Member, AMS.
INFORMS Certified Analytics Professional
Adjunct Professor, Department of Electronic and Information Engineering, Hong Kong Polytechnic University (2013-2017)
Adjunct Professor, Department of Electrical and Computer Engineering, Clemson University.
Webmaster/Social Media/Publicity Chair, IEEE Mid-Hudson Section. (Google sites) (Facebook) (blogger) (twitter)
Board of Governors, IEEE Circuits and Systems Society, 2010-2011.
General co-chair, 12th IEEE International Workshop on Cellular Nanoscale Networks and their Applications, 2010.
General co-chair, 13th IEEE International Workshop on Cellular Nanoscale Networks and their Applications, 2012.
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, 9th International Workshop on Complex Systems and Networks, 2012.
Organizing Committee Member, SIAM 2013 Annual Meeting.
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.
Senior Editorial Board Member, IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2014-2015, 2022-2023.
Deputy Editor-in-Chief, IEEE Circuits and Systems Magazine, 2014-2015.
Editor-in-Chief, IEEE Circuits and Systems Magazine, 2016-2019.
Associate editor, IEEE Transactionson Circuits and Systems, Part I, 1997-1999, 2002-2003, 2006-2007.
Associate editor, IEEE Transactionson Circuits and Systems, Part II, 2004-2005.
Associate Editor, IEEE Circuits and Systems Magazine, 2012-2013.
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 Sensor Systems.
Member, IEEE CAS Technical Committee on Multimedia Systems and Applications.
Review Committee Member, IEEE ISCAS, 2001, 2006, 2008, 2010, 2011, 2012.
Session Chair, IS&T's NIP, 2001, 2004, 2006, 2007, 2008.
Session Chair, IEEE ISCAS, 2002, 2004-2005, 2010, 2011, 2012.
Technical Committee Member, IEEE ICME2003, INDS 2008, INDS 2009.
Industry mentor, MathematicalModeling Workshop, Institute for Mathematics and its Applications, University of Minnesota,2005,2006, 2008, 2011.
IEEE Circuits and Systems Society's Distinguished Lecturer, 2006-2007
ABET EAC program evaluator, 2006-, EAC commissioner 2018-
Member, IEEE CEAA, 2016-2017.
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
Holder of 78 U.S. Patents.
IEEE R1 Technological Innovation Award, 2013.

Invited lectures and workshop presentations

'Solving Sparse Linear Systems via Flexible GMRES with In-Memory Analog Preconditioning', Minisymposium on Analog and Mixed Precision Preconditioning, Conference on Preconditioning Techniques for Scientific and Industrial Applications (Precond 24), Atlanta, Georgia, June 10-12, 2024.
'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,' 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.
'Eigenvalue bounds of matrices and control of networked dynamical systems,' NYU Distributed Systems Lab Seminar, New York City, New York, May 5, 2017.
'Geometric motifs in graphs on regular grids,' 2016 IEEE International Workshop on Complex Systems and Networks, Atlanta, Georgia, November 14-15, 2016.
'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.
'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.
'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.
'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.
'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, HongKong, September 30, 2010.
'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.
'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, University of Bristol, Bristol, United Kingdom, July 20-22, 2009.
'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.
'Controland synchronization in systems coupled via a complex network,' Hong Kong CityU-PolyU Joint Seminar Series on Chaos and Complex Networks, City University of Hong Kong, Hong Kong, May 29, 2009.
'Global Technology Outlook 2008,' Presentations given at Hungarian Academy of Sciences and Peter Pazmany Catholic University, Budapest, Hungary, Dec4-5, 2008.
'Localization of forcing sites to facilitate synchronization in systems coupled via a complex network,' International Workshop on Complex Systems and Networks, Canberra, Australia, Oct1-3, 2008.
'Global Technology Outlook 2008,' Keynote talk, IEEE 11th International Workshop on Cellular Neural Networks and their Applications (CNNA 2008),Santiago de Compostela, Spain, July 16, 2008.
'Digital Halftoning and Sensor Placement,' BIRS Workshop on Low Complexity Dynamics, Banff, Alberta, Canada, May29, 2008.
'SensorPlacement and Digital Halftoning,' ComputerScience Colloquium, The Graduate Center, City University of New York, February 28, 2008.
'Global Technology Outlook 2007,' Department of Electrical Engineering, 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 19-21, 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.
'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.
'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.
'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, nonreciprocal and delay coupling,' International workshop onnonlinear 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.

Books

C. W. Wu, Synchronization in complex networks of nonlinear dynamical systems, World Scientific, Singapore, 2007. (Table of contents, Preface, Chapter 1, Errata)
C. W. Wu, Synchronization in coupled chaotic circuits and systems, World Scientific, Singapore, 2002. (Table of contents, Preface, Chapter 1)

Book chapters

C. W. Wu, 'Control of Networks of Coupled Dynamical Systems,' in Consensus and Synchronization in Complex Networks, pp. 23-50, Springer, 2013.
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.
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, 'Qualitative Analysis of Dynamic Circuits,' in Encyclopedia of Electrical and Electronics Engineering (J. Webster ed.), John Wiley & Sons, New York, 1999.

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.), World Scientific, Singapore, 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