Jinhui Zhang

Peng Shi

Xi-Ming Sun

Yun-Bo Zhao

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Editorial
Recent Advances on the Theory and Applications of
Networked Control Systems
Yun-Bo Zhao,1 Xi-Ming Sun,2 Jinhui Zhang,3 and Peng Shi4,5
1Department of Automation, Zhejiang University of Technology, Hangzhou 310023, China
2Research Center of Information and Control, Dalian University of Technology, Dalian 116024, China
3College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
4College of Automation, Harbin Engineering University, Harbin, Heilongjiang 150001, China
5School of Electrical and Electronic Engineering, University of Adelaide, Adelaide, SA 5005, Australia
Correspondence should be addressed to Yun-Bo Zhao; yunbo.zhao@imperial.ac.uk
Received 10 March 2015; Accepted 10 March 2015
Copyright © 2015 Yun-Bo Zhao et al. This is an open access article distributed under the Creative Commons Attribution License,
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Networked control systems (NCSs) are control systems
whose control links are closed via some form of communica-
tion networks [1, 2]. These communication networks can be
either control-oriented, such as the control area network and
the DeviceNet, or data networks such as the Internet which
are not particularly optimized for real-time control systems.
The former type of NCSs, often referred to as remote control
systems, has long been an active topic in control theory
and has already been successfully implemented in various
industrial applications. However, it is the latter that has made
NCSs an emerging research field in the recent decades, posing
a number of great challenges for the control community as
well as proposing even more potentially exciting applications
in the future [3, 4]. Indeed, the data networks used in NCSs
are featured by ubiquitous access and high throughput but
have no real-time transmission or data consistency guarantee.
These features have made NCSs cost-effective, maintainness-
friendly, readily extendible, and reconfigurable but left a
number of open questions to deal with as well [5–7].
The interest in NCSs originates with the control com-
munity, and therefore it is no wonder why NCSs have
usually been regarded as control systems with only some
special features, that is, the use of the data networks. With
this perspective, various conventional control methods have
found their applications to NCSs, contributing a major part
in the early days to the research on NCSs [8]. People soon
realized that the communication networks should not be only
modelled as given parameters to the control systems. The
active use of, or even themodification of, the communication
networks can potentially give rise to much better systems
performance. In fact, the codesign approach, that is, the
integration of both control and communication, can be the
ideal approach to NCSs [9–12].
In this special issue, a dozen of research works on NCSs
and the related topics are reported. We are proud to notice
that these limited numbers of research works have shown a
great variety and in a sense give a fairly complete picture of the
state-of-the-art research onNCSs. In addition, a brief tutorial
on NCSs from the Editorial Board is also included in this
special issue.
This special issue is organized in the following way.
First, theoretical studies constitute the major part of the
works reported here. Various control methods have been
used, for example, H
∞
output feedback control (S. H. Kim),
guaranteed cost fault tolerant control (Y. Zhu et al.), and
model predictive control (Q. Chen et al. andM. Li et al.). The
authors have also considered different design and analysis
issues in NCSs, for example, the stability of the closed-loop
system (S. W. Yun et al. and A. F. Khalil and J. Wang), the
robust design of NCSs (Z. Lu et al.), and the quantization
effect (S. W. Yun et al.).
These theoretical studies from mainly the control per-
spective are then balanced with research works that have
taken active consideration of the communication networks
Hindawi Publishing Corporation
Mathematical Problems in Engineering
Volume 2015, Article ID 239620, 2 pages
http://dx.doi.org/10.1155/2015/239620
2 Mathematical Problems in Engineering
in NCSs. These include, for example, a codesign approach
which integrates an event generator and a dynamic output
feedback controller (D. Ma et al.) and the energy balanced
redeployment algorithm for the wireless version of NCSs (G.
Ye et al.). This type of works then further leads to a more
network-based perspective, as seen in the works done by M.
Manzano et al. and L. Du et al., where access control in ad hoc
networks and pinning synchronization of switched complex
dynamical networks are considered.
Finally, the special issue is concluded by the exciting
applications of NCSs, which include, for example, distributed
fault estimation applied to robotic manipulator (J. Chen
et al.), banknote validation using RFID and NFC techniques
(M. H. Eldefrawy and M. K. Khan), and the control and
optimization of smart homes (J. Lai et al.).
To conclude, we believe that this Special Issue contains
sufficiently interesting materials on NCSs and the related
topics, both in theory and in applications. We hope this
special issue will be a useful reference for people working on
NCSs, and more fruitful results will be obtained in the time
ahead based on the published works.
Acknowledgment
We are very grateful to the great support and encouragement
from publishing and Editorial Board of this journal, which
have made this project possible and successful.
Yun-Bo Zhao
Xi-Ming Sun
Jinhui Zhang
Peng Shi
References
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Editorial Recent Advances on the Theory and Applications of Networked Control Systems

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