scholarly journals A Random Traffic Assignment Model for Networks Based on Discrete Dynamic Bayesian Algorithms

2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Wei Zhou

In this paper, a stochastic traffic assignment model for networks is proposed for the study of discrete dynamic Bayesian algorithms. In this paper, we study a feasible method and theoretical system for implementing traffic engineering in networks based on Bayesian algorithm theory. We study the implementation of traffic assignment engineering in conjunction with the network stochastic model: first, we study the Bayesian algorithm theoretical model of control layer stripping in the network based on the discrete dynamic Bayesian algorithm theory and analyze the resource-sharing mechanism in different queuing rules; second, we study the extraction and evaluation theory of traffic assignment for the global view obtained by the control layer of the network and establish the Bayesian algorithm analysis model based on the traffic assignment; subsequently, the routing of bandwidth guarantee and delay guarantee in the network is studied based on Bayesian algorithm model and Bayesian algorithm network random traffic allocation theory. In this paper, a Bayesian algorithm estimation model based on Bayesian algorithm theory is constructed based on network random observed traffic assignment as input data. The model assumes that the roadway traffic distribution follows the network random principle, and based on this assumption, the likelihood function of the roadway online traffic under the network random condition is derived; the prior distribution of the roadway traffic is derived based on the maximum entropy principle; the posterior distribution of the roadway traffic is solved by combining the likelihood function and the prior distribution. The corresponding algorithm is designed for the model with roadway traffic as input, and the reliability of the algorithm is verified in the arithmetic example.

Author(s):  
Junxiang Xu ◽  
Jingni Guo ◽  
Jin Zhang

Current traffic assignment theories and methods are studied. To address the limitations of existing models and algorithms in solving the traffic assignment problems under uncertain supply and demand, a traffic assignment model based on the cumulative prospect theory is proposed. Firstly, the problem of uncertain supply and demand of the traffic network is described, and an improved traffic impedance function of road sections is proposed. Then, the reference point of generalized cost and the reference point of the dynamic section risk are set up, and the comprehensive cumulative prospect value function considering the preference coefficient of the reference point is given. A traffic assignment model based on the cumulative prospect theory is constructed, and an isolation niche genetic simulated annealing algorithm is designed to solve the model. Finally, with the highway traffic network in the Sichuan-Tibet region as an example, the process of network traffic equilibrium based on the cumulative prospect theory under the fixed and changing network structure is studied respectively, and parameter sensitivity and algorithm comparison are analyzed. The results show that the proposed traffic assignment model based on the cumulative prospect theory provides a good idea for solving the traffic assignment problem under uncertain supply and demand, and is of theoretical significance and application value.


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