Upcoming seminar by Mr. Wei Chen, Explosive Percolation on Networks

Internal Seminar of the Centre for Chaos and Complex Networks
(Department of Electronic Engineering, CityU Hong Kong; Director: Prof. Guanrong (Ron) Chen)

&

Journal Club

The idea behind this event is to establish a platform for regular internal scientific exchange, and to give young researcher the opportunity to present their work and ideas.
Furthermore, interesting topics and concepts related to the field of chaotic dynamics and complex networks are presented to give a deeper and broader understanding
of this wide and highly connected research field. Last but not least, this event shall provide a chance for the presenter to work on his presentation skills, which are essential
a professional career of any kind.

Speaker:
Mr. Chen Wei

Title:
Explosive Percolation on Networks

Time & Place:
Tue, 1st of Nov. 2011, 11 - 12 am
Study Room 1004 in the Library, Humanities Section
(see attached location map)

Abstract:
Networks in which the formation of connections is governed by a random process often undergo a percolation
transition, wherein around a critical point, the addition of a small number of connections causes a
sizable fraction of the network to suddenly become linked together. Typically such transitions are continuous,
so that the percentage of the network linked together tends to zero right above the transition point.
Whether percolation transitions could be discontinuous has been an open question. Here, we show that
incorporating a limited amount of choice in the classic Erdos - Renyi network formation model causes its
percolation transition to become discontinuous.

About the Speaker:

Mr. Wei Chen is a fifth year Ph.D. candidate from Peking University, School of Mathematical Sciences. His
research focus on complex networks, specically the dynamics and critical behavior in networks, community
detection, pattern recognition and applications of network theory in real systems.

All are welcome

Upcoming Seminar Thu, 27 of Oct. 2011, 11 - 12 am by Dr. Zhang, Hongwei

Speaker:

Dr. Zhang, Hongwei

Title:

Cooperative Tracking Tontrol of Multi-Agent Systems

Time & Place:
Thu, 27 of Oct. 2011, 11 - 12 am
Study Room 1004 in the Library, Humanities Section

Abstract:

In the past few decades, an increasing number of industrial, military and consumer applications call for the cooperation
of multiple interconnected agents. The agents can be autonomous mobile robots, robot manipulators, spacecraft,
unmanned air vehicles (UAVs), or wireless sensors. Such applications include formation of mobile robots, multipoint
surveillance, UAV formation flying, wireless sensor networks, etc. Research of cooperative control is inspired by sociobiological groups, such as flocking birds, schooling fish, where each individual is influenced by its nearest neighbors, while the group behaves as a whole to prevent the predator or explore the environment.  The neighborhood interaction plays a vital role in the behavior of multi-agent systems.


This talk will focus on synchronization of identical general linear systems on a directed graph containing a spanning tree. A leader node or command generator is considered, which generates the desired tracking trajectory. It is shown that unbounded synchronization regions that achieve synchronization on arbitrary digraphs containing a spanning tree can be guaranteed by using linear quadratic regulator based optimal control and observer design methods at each node.

About the Speaker:

Hongwei Zhang received his B.E. and M.E. degrees from the Department of Automation, Tianjin University (China) in 2003 and 2006, respectively, and his PhD degree from the Department of Mechanical and Automation Engineering, the Chinese University of Hong Kong in 2010. From July 2009 to December 2010, he was a visiting scholar and subsequently a ostdoctoral researcher at ARRI, the University of Texas at Arlington, Texas, USA. Since February 2011, he has been with the City University of Hong Kong, as a postdoctoral researcher. He serves as a reviewer for many refereed journals and conferences, including Automatica, Systems & Control Letters, IEEE Trans. Neural Netw., and IEEE Conf. Decision Control. His current research interests are cooperative control, neural adaptive control, approximate dynamic programming, and optimal control.

All are welcome

The idea behind this event

Internal Seminar of the Centre for Chaos and Complex Networks

                                                     Department of Electronic Engineering,

 CityU Hong Kong; 

Director: Prof. Guanrong (Ron) Chen)

The idea behind this event is to establish a platform for regular internal scientific exchange, and to give young researcher the opportunity to present their work and ideas. 

Furthermore, interesting topics and concepts related to the field of chaotic dynamics and complex networks are presented to give a deeper and broader understanding
of this wide and highly connected research field. 

Last but not least, this event shall provide a chance for the presenter to work on his presentation skills, which are essential a professional career of any kind.