IEEE Circuits and Systems Magazine - Q2 2018 - 10

Feature

Singularities of Nonlinear
Circuit Theory and Applications:
Achievements of
Professor Leon Ong Chua

sung-mo "steve" Kang
FOOtagE FIrm, Inc.

P

rofessor Leon O. Chua is globally recognized as
a profound founder of modern nonlinear circuit
theory and original researcher. It was my personal
fortune to become one of Leon's early graduate students
at the University of California, Berkeley in 1972 soon after
his move to UC Berkeley from Purdue University. The Circuits and Systems faculty at that time included late professors Ernest Kuh, Charles Desoer and professors Lofti
Zadeh, Elijah Jury, and Lucien Polak, among others. The
Integrated Circuits faculty was consisted of late professor
Donald Peterson and professor David Hodges, and their
associates. Leon's graduate research group included Robert Schilling, Douglas Green, formerly of UCLA, John Wyatt
of MIT, and some years later Stephen Boyd of Stanford University, Michael Peter Kennedy of the University College
Cork, Ireland, and Chai Wah Wu of IBM Yorktown Heights,
NY. His brilliance and passion for research attracted many
Digital Object Identifier 10.1109/MCAS.2018.2821723
Date of publication: 21 May 2018

10

IEEE cIrcuIts and systEms magazInE

talents. For CAS Society Leon hosted the 1974 San Francisco ISCAS and served as president in 1977. I met many
distinguished visitors and many of them have become
life-long colleagues- to mention a few, professor Timothy
Trick of the University of Illinois at Urbana-Champaign,
late professor Tamas Roska from Hungary, professor Akio
Ushida of Tokushima University, Japan. It is difficult to list
Leon's life-long achievements in a limited space. Here I will
try to describe a subset that I have had some involvement
under Leon's guidance. My own research topics included
modeling of nonlinear devices and systems. The world of
nonlinear circuits and systems is considered broad and
Leon's research strategy was to classify and investigate
particular classes of nonlinear systems. Leon's first book
on nonlinear network theory [1] describes specific nonlinear systems. One of projects that I was initially worked
on was on development of a canonical representation of
piecewise linear functions using a combination of linear
functions, absolute value functions with different breakpoints and jump discontinuities as [2]

1531-636X/18©2018IEEE

sEcOnd quartEr 2018



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