mJADES: Concurrent Simulation in the Cloud

We discuss a parallel implementation of an agent-based simulation. Our approach allows to adapt a sequential simulator for large-scale simulation on a cluster of workstations. We target discrete-time simulation models that capture the behavior of Web users and Web sites. Web users are connected with each other in a graph resembling the social network. Web sites are also connected in a similar graph. Users are stateful entities. At each time step, they exhibit certain behaviour such as visiting bookmarked sites, exchanging information about Web sites in the "word-of-mouth" style, and updating bookmarks. The real-world phenomena of emerged aggregated behavior of the Internet population is studied. The system distributes data among workstations, which allows large-scale simulations infeasible on a stand-alone computer. The model properties cause traffic between workstations proportional to partition sizes. Network latency is hidden by concurrent simulation of multiple users. The system is implemented in Mozart that provides multithreading, dataflow variables, component-based software development, and network-transparency. Currently we can simulate up to 106 Web users on 104 Web sites using a cluster of 16 computers, which takes few seconds per simulation step, and for a problem of the same size, parallel simulation offers speedups between 11 and 14.

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Concurrent Simulation and Testing Concept in Engine Development

10.4271/940207 ◽

1994 ◽

Cited By ~ 7

Author(s):

Thomas Morel ◽

Leon A. LaPointe

Keyword(s):

Concurrent Simulation ◽

Engine Development

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Ferromagnetic Shape Memory Thin Film In-Plane Actuators: Assessment of Mechanical Output

Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2007-35467 ◽

2007 ◽

Author(s):

Vesselin Stoilov

Keyword(s):

Thin Film ◽

Shape Memory ◽

Control Systems ◽

Multiscale Model ◽

Servo Control ◽

Ferromagnetic Shape Memory Alloy ◽

Shape Memory Actuators ◽

Micro Actuators ◽

Concurrent Simulation ◽

Ferromagnetic Shape Memory

Ferromagnetic shape memory alloy micro actuators and motors are promising for applications in various servo control systems, with the potential to provide ultra(sub-nano)-precision positioning and compensation. This article shows that in an in-plane configuration, thin film ferromagnetic shape memory actuators open the possibility to reach more powerful actuators keeping the same geometric dimensions by simply stacking these films. The assessment of mechanical output for the FSMA thin film actuators have been done with a multiscale model, which allowed for concurrent simulation of the phenomena at atomic and mesoscale.

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