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Journal ArticleDOI

A modified ant colony optimisation based approach to solve sub-tour constant travelling salesman problem

16 Oct 2017-International Journal of Mathematics in Operational Research (Inderscience Publishers (IEL))-Vol. 11, Iss: 3, pp 310-331

TL;DR: This paper presents a modified form of the basic ACO algorithm, obtained by introducing a new operation known as restoring operation for solving the SCTSP problem, where the low-quality path/solution given by any ant is replaced by a nearest better solution.

AbstractThis paper presents an advanced ant colony optimisation approach to solve sub-tour constant travelling salesman problem (SCTSP) with time limit in fuzzy environment. In SCTSP, there is a set of sub-tours (two cities for each sub-tour). A traveller must complete his/her tour with predetermined sequence of distinct sub-tours. In this proposed model, the total time of travel must not exceed a predetermined time limit, i.e., the salesman should maintain a maximum time limit to complete his/her tour. In this paper, we present a modified form of the basic ACO algorithm, obtained by introducing a new operation known as restoring operation for solving the problem. In restoring operation, the low-quality path/solution given by any ant is replaced by a nearest better solution. The proposed problem is solved by considering fuzzy travel costs and time. Fuzzy credibility measure and graded mean integration method are used to obtain optimal decision. Computational results with different datasets are presented for illustration.

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Book ChapterDOI
01 Jan 2021
Abstract: A synergetic approach for simulation the processes of optimizing cargo delivery routes, taking into account the non-stationary dynamics of traffic flows on sections of the urban road network is proposed. Here, route optimization is carried out using a modified ant colony self-organization algorithm. At that, the analytical dependences of the change in the speed of the traffic flow on the characteristic time and load density on sections of the road network are determined in the framework of the synergetic Lorentz model. Simulation of the building of optimal routes is carried out using the proposed approach on the example of the Kiev city. The possibility of using this approach to solve the problems of efficient control of the process of routing freight traffic in conditions of the real dynamics of traffic flows is shown. Prospects for the use of the developed approach in intelligent transportation systems are discussed, for example, in solving problems of dynamic routing of vehicles using traffic prediction information.