糖心TV

NOTE REGISTRATION DEADLINE 6 APRIL (as of 27 March).

The International Workshop on Complex Systems and Networks 2009 (IWCSN09) will be the 6th International Workshop in a successful series of events organized in Bologna (2004), Hong Kong (2005), Vancouver (2006), Guilin (2007) and Canberra (2008). The aim of the workshop is to foster exchange and collaboration among researchers in the fields of multi-agent and complex systems, nonlinear dynamics, networks and coupled systems and related applications. The 2009 edition will be organized by the Bristol Centre for Complexity Sciences, a new interdisciplinary centre in Complexity funded by the UK EPSRC (Engineering and Physical Research Council). The workshop will be focussed on the problem of studying the emergence of coordinated behaviour in multi-agent systems and networks and their applications. Topics will include synchronization and control of networks of dynamical systems, coordination of behaviour in multi- agent systems, applications to biological and communication networks, epidemics and artificial intelligence. The meeting is sponsored by the IEEE Circuits and Systems Society, the Centre for Chaos and Complex Networks at the City University of Hong Kong, the EU Project PASCAL and the Bristol Centre for Complexity Sciences. On Monday 20th July 2009, a set of tutorial lectures on complex networks will be run as part of this workshop. Organisers     * Mario di Bernardo (Chair)    * John Hogan    * Nello Cristianini    * Eddie Wilson    * Caroline Coljin Invited speakers     * Prof Guanrong Chen (Hong Kong)    * Prof David Hill (Canberra, Australia)    * Dr Chai Wah Wu (IBM T.J. Watson Research Center, USA)    * Prof Juergen Kurths (Potsdam, Germany)    * Prof Michael Tse (Hong Kong)    * Prof Ljiljana Trajkovic (Vancouver)    * Prof J.J. Slotine (MIT)    * Prof Maurizio Porfiri (New York)    * Prof Erik Volz (Cornell)    * Prof Mike Kearns (Pennsylvania) Registrations are now open online at There is a strict limit on the number of participants at this meeting. The registration deadline is 6th April 2009.

James Greenberg (CMU) 

Discrete Lagrangian Traffic Models

We discuss some of the more popular Discrete Lagrangian Traffic
Models. We focus our attention on two of such models, namely the “Optimal Velocity
Model” and the “Intelligent Driver Model.” Both describe cars traveling on a
unidirectional, one-lane highway.
New Material will include A-Priori estimates which are independent of the number
of cars on the road. These estimates guarantee that the models are well posed;
specifically they imply no car collisions and no velocity reversals.
We also investigate Large Amplitude “Stop and Go Waves.” These are “Traveling
Wave” solutions of the underlying systems. Typically, such solutions exits and are
stable when the “Equilibrium Solutions” where cars are uniformly spaced have a
large, linearly unstable region. As with Wilson’s studies on this subject the small
wave number dispersion relation will be a critically important tool.
We also discuss how to obtain PDE models with the same basic properties as
the discrete models. These PDE systems are obtained by matching the small wave
number dispersion relationships.