Conference Program of WCICA 2012

WCICA 2012
Book of Abstracts: Sunday Sessions
Yang, Fan
Univ. of Beihang
This paper presents a design procedure of static H∞loop-shaping control
for linear time-invariant system. The H∞loop-shaping weights are
selected by maximizing the robust stability margin of closed-loop system
while ensuring that the resulting loop-shape lives in a pre-defined
region. Existence conditions for a static output loop-shaping controller
are given in terms of two linear matrix inequalities. A major advantage
of the proposed method is its low computational complexity. Meanwhile,
the controller has the simplest structure and the smallest complexity
of realization. The efficacy of the proposed method is shown on the
AF25B Unmanned Helicopter control design.
◮ SuA10-4 14:30–14:50
A New Approach for Long-term Person Tracking, pp.4926–4930
Fu, Deqian
Jhang, Seong Tai
Linyi Unitersity
The Univ. of Suwon
Abstract –This paper investigates long-term visual person tracking using
particle filter as the underlying framework and online boosting as the
detection strategy. In the case of the being tracked person with abrupt
motion, under occlusion or in low sample rate of video source, two main
issues rise inevitably. One is the poor constraint of person motion model,
and the other is the drastic variation of pose or incomplete appearance
when the person reappears. We address the problems with an
integrated framework of multiple observers, and online boosting algorithm
with independent features and its static and dynamic combination
aiming to balance the tradeoff of adaption and drift.
◮ SuA10-5 14:50–15:10
Research on the Strategy Method for the Final Translation Phase of
Space Autonomous Rendezvous, pp.290–294
Li, Nan
Liu, Zhenghua
Li, Huifeng
Zong, Xiaoxiao
Beihang Univ.
School of Automation
Beihang Univ.
Beihang Univ.
In this paper, a Multi-mode switching guidance control strategy is proposed
for the final translation phase space autonomous rendezvous
and docking precision-guided control problem. Firstly, dynamic model
for spacecraft rendezvous is established and analyzed under the target
coordinates. Secondly,the final translation phase is divided into two
parts, constant speed translation phase and inconstant speed translation
phase. In the constant speed phase, PID controller is used for
ensuring control precision. Considering the uncertainty and nonlinear
characteristics of the system, a fuzzy controller is designed to realize
the precise guidance for inconstant speed translation phase. The w-
hole control process is based on the error threshold control method to
reduce fuel consumption. The simulation results demonstrate the effectiveness
of the proposed guidance control strategy. Finally, the method
of converting the continuous control law into the relay-type control law is
discussed. The relay-type control law is easier to realize in engineering
application.
◮ SuA10-6 15:10–15:30
Design and Mathematical Modeling of a 4-Standard-Propeller (4SP)
Quadrotor, pp.3270–3275
Phang, Swee King
National Univ. of Singapore
Cai, Chenxiao Inst. of Automation, Nanjing Univ. of Sci. & Tech.
Chen, Ben M.
National Univ. of Singapore
Lee, Tong Heng
National Univ. of Singapore
The recent development of small yet sophisticated sensors has led
to the development of smaller unmanned aerial vehicles, especially
in the form of quadrotor. When it is limited by the availability of the
reverse propellers, the conventional quadrotor will no longer be realizable,
and thus introducing the 4-standard-propeller (4SP) quadrotor
design. This paper presents a comprehensive nonlinear modeling of a
4SP quadrotor, and the guidelines to design it. The advantages of constructing
such aircraft and its detailed working principle are first highlighted.
A nonlinear mathematical model is then derived based on the
first-principles approach. The model parameters are finally identified
and verified through actual flight tests.
SuA11 13:30–15:50 Room 311C
Invited Session: Quantum Control and Quantum Information
Chair: Xi, Zairong
Co-Chair: Cong, Shuang
Chinese Acad. of Sci.
Univ. of Sci. & Tech. of China
◮ SuA11-1 13:30–13:50
An Efficient Scheme for Multi-party Quantum State Sharing via GHZ
Channels, pp.5122–5126
Jiang, Min
Dong, Daoyi
Soochow Univ.
Inst. of Sys. Sci., CAS
We develop an innovative and efficient scheme to share an arbitrary
multi-qubit state between agents via only one GHZ channel under control
of agents in a network. Compared with existing ones in this literature,
our scheme involves less qubits, only single-qubit measurements,
Bell-basis measurement and CNOT gate operations and thus exhibits
a higher overall efficiency.
◮ SuA11-2 13:50–14:10
Transition graph-based control of quantum eigenstates, pp.1750–1755
Kuang, Sen
Cong, Shuang
Univ. of Sci. & Tech. of China
Univ. of Sci. & Tech. of China
Based on the analysis of the invariant set in quantum Lyapunov control
under a performance index with degrees of freedom, the population
control of eigenstates is studied. For isolated target eigenstates, this
paper shows the existence of the degrees of freedom that guarantee
exact convergence and obtains rigorous construction relation of those
degrees of freedom. For non-isolated target eigenstates, we propose a
path-planning-based method. The method considers transition paths of
controlled systems, so can achieve intuitive and high-probability transition
to desired target eigenstate accompanied with appropriate design
of those degrees of freedom.
◮ SuA11-3 14:10–14:30
Implicit Lyapunov Control of Multi-Control Hamiltonian Systems Based
on State Distance, pp.5127–5132
Meng, Fangfang
Cong, Shuang
Kuang, Sen
Univ. of Sci. & Tech. of China
Univ. of Sci. & Tech. of China
Univ. of Sci. & Tech. of China
For closed quantum systems, if controlled systems are strongly regular
and all other eigenstates are directly coupled to a target state, then
such control systems can be asymptotically stabilized by means of the
Lyapunov-based control. However, when the controlled systems are
not strongly regular, or when there exists at least one eigenstate that is
directly uncoupled to the target state, the situations will become complicated.
This paper proposed a method based on an implicit Lyapunov
function to overcome these two degenerate cases. Also, the proposed
method is suitable for multi-control Hamiltonian systems. The convergence
of closed-loop systems is analyzed by the LaSalle invariance
principle. Finally, numerical simulation experiments on a 4-level system
are done. The experiment results show the effectiveness of the implicit
Lyapunov control method for degenerate cases and multi-control
Hamiltonians.
◮ SuA11-4 14:30–14:50
quantum discord dynamics of two atoms under different quantum feedbacks,
pp.1634–1638
Wang, Hui
Xi, Zairong
Chinese Acad. of Sci.
Chinese Acad. of Sci.
The author studies the dynamics of two identical atoms resonantly coupled
to a single-mode cavity under two different quantum feedback controls,
i.e., the symmetric feedback control and the nonsymmetric feedback
control. Correspondingly, the quantum discord of the system is
induced to reach steady values under these two kinds of feedback controls.
Furthermore, in some cases, the steady value of quantum discord
of the system under symmetric feedback control is much larger than
the steady value under nonsymmetric feedback control. The situation
is just the opposite when the initial state is —eg¿. It is also found that
the feedback is not good for getting a high discord when the initial state
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