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In this paper, the vehicle routing problem with time windows (VRPTW) was considered, and a mixed integer programming mathematic model of VRPTW was proposed in detail. Meantime, an improved ant colony algorithm (IACA) was proposed to overcome the shortcomings of premature convergence and slow convergence of conventional ant colony algorithm (ACA). The experiment results showed that the IACA can solve...
p-Cycle protection is an efficient pre-configured and pre-cross-connected protection scheme which can achieve ring-like recovery speed while retaining the capacity efficiency of mesh-based schemes. Thereafter, we study the stability and the efficient reconfiguration of p-cycles in the context of dynamic asymmetric traffic, a protection problem that is acknowledged to be difficult to solve, but with...
The location-routing problem is one of the problems in distribution network designing and logistic management, whose mathematical model is proposed in this paper firstly. Since finding the optimal solution for this model is an NP(non-polynomial)problem, we divide the original problem into two sub-problems, i.e., one is the location-allocation problem and the other is general vehicle routing problem...
In this paper, we study the freight train formation plan problem by multi-agent method. We build a decision-making scheme where the decision regarding on how to maximize the total profit and individual profit in different sets of states. We explain how to coordinate the actions of different agents and describe the cooperation mechanisms. Finally, we examine the validity and feasibility of the model...
In this paper we discuss the relevance of performing a population dynamics analysis to improve the results obtained using agent-based artificial life systems for optimization. The present study derives from our work trying to solve engineering optimization problems using a distributed approach based on agent's interactions. We have realized that a simple analysis of the population dynamics can show...
Recent advances in the general theory of multivariable and large-scale systems have contributed to the development of hierarchical control schemes where the overall decision-making task is distributed over a number of hierarchical levels. Use of such a hierarchical framework for the design of control schemes at the transport level in large computer communication networks can result in several beneficial...
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