Papers by Roozbeh Daneshvar
We present a network study of the Santa Fe Institute Complex Systems Summer School (SFI CSSS) 200... more We present a network study of the Santa Fe Institute Complex Systems Summer School (SFI CSSS) 2009. SFI CSSS 2009 participants consisted of complex systems researchers who were competitively selected to attend the month-long program. The international and interdisciplinary group spent four weeks together attending lectures, engaging in discussions, and collaborating on projects related to complex systems. We found that the CSSS 2009 network became increasingly decentralized and heterogeneous at the end of the program.
Complexity, Volume 18, Issue 4, pages 41–54, March/April 2013, Apr 2013
In this article, we study the dynamics of coupled oscillators. We use mechanical metronomes that ... more In this article, we study the dynamics of coupled oscillators. We use mechanical metronomes that are placed over a rigid base. The base moves by a motor in a one-dimensional direction and the movements of the base follow some functions of the phases of the metronomes (in other words, it is controlled to move according to a provided function). Because of the motor and the feedback, the phases of the metronomes affect the movements of the base, whereas on the other hand, when the base moves, it affects the phases of the metronomes in return. For a simple function for the base movement (such as y = γx[rθ1 + (1 − r)θ2] in which y is the velocity of the base, γx is a multiplier, r is a proportion, and θ1 and θ2 are phases of the metronomes), we show the effects on the dynamics of the oscillators. Then, we study how this function changes in time when its parameters adapt by a feedback. By numerical simulations and experimental tests, we show that the dynamic of the set of oscillators and the base tends to evolve towards a certain region. This region is close to a transition in dynamics of the oscillators, where more frequencies start to appear in the frequency spectra of the phases of the metronomes. We interpret this as an adaptation towards the edge of chaos.
Abstract: In this article we study the dynamics of coupled oscillators. We use mechanical metrono... more Abstract: In this article we study the dynamics of coupled oscillators. We use mechanical metronomes that are placed over a rigid base. The base moves by a motor in a one-dimensional direction and the movements of the base follow some functions of the phases of the metronomes (in other words, it is controlled to move according to a provided function).
In this project we study a simple model of the effects of gossip spread on social network structu... more In this project we study a simple model of the effects of gossip spread on social network structure. We define gossip as information passed between two individuals A and B about a third individual C which affects the strengths of all three relationships: it strengthens AB and weakens BC and AC. We find out that if gossip occurs in simple triads, it destroys them but if gossip propagates through large dense clusters, it strengthens them. This work is novel in two respects.
In this article,we develop a simple model for the effect of gossip spread on social network struc... more In this article,we develop a simple model for the effect of gossip spread on social network structure.We define gossip as information passed between two individuals A and B about a third individual C which affects the strengths of all three relationships: it strengthens A-B and weakens both B-C and A-C.We find, in both an analytic derivation and model simulations, that if gossip does not spread beyond simple triads, it destroys them but if gossip propagates through large dense clusters, it strengthens them. Additionally, our simulations show that the effect of gossip on network metrics (clustering coefficient, average-path-length, and sum-of-strengths) varies with network structure and average-node-degree.
Intelligent virtual agents: 4th …, Jan 1, 2003
A new approach for learning is presented here. The system that is named Sepanta consists of a set... more A new approach for learning is presented here. The system that is named Sepanta consists of a set of agents that are doing a task. Behaviors of agents are adapted according to emotional signals provided by two parts called emotional critic: one global, generating signal for all agents and, one local, for each agent generating signal specifically for it. The main learning algorithm is Q-Learning that is improved by using these signals. Simulation is done for the task of pushing a mass by a number of robots. The main idea for this work has ...
2006 IEEE International Conference …, Jan 1, 2006
Abstract In this paper we have considered systems in which agents communicate via their environme... more Abstract In this paper we have considered systems in which agents communicate via their environment. In these systems the agents do not have direct and explicit communication with each other and instead they have implicit communication which is performed via the environment they are located in. Different kinds of environment elements are considered to be changed while on the other hand for all of these situations there is a change in the environment and this change means potential stimuli that fires behaviors of agents for ...
Proceeding of the 5th …, Jan 1, 2010
50 years of artificial …, Jan 1, 2007
In this paper we have investigated a group of multi agent systems (MAS) in which the agents chang... more In this paper we have investigated a group of multi agent systems (MAS) in which the agents change their environment and this change has the potential to trigger behaviors in other agents of the group in another time or another position in the environment. The structure makes it possible to conceptualize the group as a super organism incorporating the agents and the environment such that new behaviors are observed from the whole group as a result of the specific distribution of agents in that environment. This distribution exists in many ...
WSEAS Transactions on Systems, Jan 1, 2004
Systems, Man, and …, Jan 1, 2010
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Papers by Roozbeh Daneshvar