Gordan Stojić

Golden ratio (sectiona aurea) in markovian ants AI hybrid

The exponential pheromone signal of the AI hybrid of Markovian Ant Queuing System - MAQS, is divided into the spatial and deposit pheromone fractions which have the identical values. A new hybrid is formed. The convolution of two new exponential signals has the Erlang distribution. Introducing the interstate in the process of markovization the Erlang Queuing Ant System - EQAS, is solved. Comparison of the average distance between artificial ants in MAQS and EAQS gave particular numerical specificity. The average distances are in ? equilibrium. Constant ? is a famous constant of the Golden ratio.

A Survey of Hybrid Artificial Intelligence Algorithms for Dynamic Vehicle Routing Problem

In a Dynamic Vehicle Routing Problem (DVRP) new customer orders and changes of existing orders continually arrive and thus disrupt the optimal routing plan. This paper presents a survey of some of the recent hybrid artificial intelligence algorithms suitable for efficient optimization and re-optimization of different DVRPs. An artificial ant colony 2-OPT hybrid algorithm, a hybrid neighborhood search algorithm, and a hybrid heuristic algorithm are explained in detail. Particular interest is focused towards local improvement heuristic algorithms, such as 2-OPT algorithm and OR’s algorithm, which are regularly used in hybrid approaches for intra-route and inter-route improvements.

The spatial pheromone signal for ant colony optimisation

The effect of the passive insecticide on the ant colony Monomorius pharaonis is localised with minor losses -- only one ant. The information on the insecticide location is transferred through the colony in all directions with great speed. After deserting the basic trail, a rapid consolidation of the new ant colony is probably established by the spatial pheromone signal. A simulation model for the time calculation and the number of ants necessary for the formation of the shortest way between the nest and the fictive food source was formed. The basic ant performances have a prevailing part in the shortest trail formation and those are: the range of the radius pheromone signal and the intensity of the pheromone trail evaporation.

A virtual mass model in train aerodynamics

This paper describes a new method of research in to the aerodynamics of vehicles, and how to interpret them. The virtual mass is related to the absorption of kinetic energy and the unit coefficient of restitution of a central collision. Train systems are used to exemplify the approach, and the virtual mass effect is air. Successive collisions of these two factors and systems offer a model of air resistance. Thereby, a relationship between the most important aerodynamic characteristic (the coefficient of aerodynamic profile) and the virtual mass is established.