Multi-Objective Evolutionary Optimization of Agent-based Models: An Application to Emergency Response Planning

G. Narzisi, V. Mysore, and B. Mishra (USA)

Keywords

Multi-Objective Optimization, Agent-based Modeling, Pareto Front, Multi-Objective Evolutionary Algorithms, Robustness, Disaster Management.

Abstract

Agent-based models (ABMs) / multi-agent systems (MASs) are today one of the most widely used modeling– simulation–analysis approaches for understanding the dy namical behavior of complex systems. These models are often characterized by several parameters with nonlinear interactions which together determine the global system dynamics, usually measured by different conflicting crite ria. The problem that emerges is that of tuning the control lable system parameters at the local level, in order to reach some desirable global behavior. In this research paper, we cast the tuning of an ABM for emergency response planning as a multi-objective op timization problem (MOOP). We then propose the use of multi-objective evolutionary algorithms (MOEAs) for ex ploration and optimization of the resultant search space. We employ two well-known MOEAs, the Nondominated Sorting Genetic Algorithm II (NSGA-II) and the Pareto Archived Evolution Strategy (PAES), and test their perfor mance for different pairs of objectives for plan evaluation. In the experimental results, the approximate Pareto front of the non-dominated solutions is effectively obtained. Fur ther, a conflict between the proposed objectives is patent. Additional robustness analysis is performed to help policy makers select a plan according to higher-level information or criteria not present in the original problem description.

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