
Preface
 XIE LiangLiang, ZHANG JiFeng

2021, 34(5):
15971598.

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Year 2021 marks the 20th anniversary of this journal being retitled Journal of Systems
Science and Complexity, under the suggestion of Professor Lei Guo, who became the Editorin
Chief in 2001 and led its development for three terms from 2001 to 2014. This year also
sees the 60th birthday of Prof. Guo. Therefore, for a celebration of these happy occasions, we
invited some of the most internationally renowned scholars in the field, who have connections
with Prof. Guo in various ways, to contribute to this special issue.
The contributions in this special issue cover many aspects of systems and control, including
stochastic systems, system identification, optimal control, sampleddata control, control with
delay, game theory, risk management, nonlinear systems, networked systems, etc. Besides recent
progresses, the papers in this special issue also include reviews, reflections and perspectives. It
is a celebration of Prof. Guo’s close to forty years’ contributions in the field by various authors.
Prof. Guo has made fundamental contributions in adaptive control, system identification,
adaptive signal processing, and stochastic systems. His current research interests include control
of nonlinear uncertain systems, PID control theory, distributed filtering and estimation,
capability of feedback, multiagent systems, gamebased control systems, and complex systems,
among others.
Besides his research contributions, Prof. Guo is also a leading figure in China’s advances in
the field of systems and control. The 20 years’ development of this journal is just one example.
We take this opportunity to wish Prof. Guo a very happy 60th birthday, and we look forward
to many years of new contributions from him.
XIE LiangLiang, ZHANG JiFeng
Beijing, 2021