2009, VOLUME 10 #1. "TRANSPORT AND TELECOMMUNICATION". ЖУРНАЛ ИЗДАТЕЛЬСТВА TSI, ISSN 1407-6160, ISSN 1407-6179
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Universidad del Valle de México,
Campus Guadalajara Sur Periférico
Sur No. 8100 C.P. 45601 Guadalajara, Jal. México
In this paper a microscopic discrete event urban traffic model validation using simulation is presented. In a previous study a hierarchical microscopic urban traffic system (UTS) model was developed . That model integrates the event oriented and agent-based approach. The UTS is described using the multi-level Petri net based formalism, named n-LNS. The first level describes the traffic network; the second level models the behaviour of diverse road network users considered as agents, and the third level specifies detailed procedures performed by the agents, namely travel plans, tasks, etc.. Usually simulators are designed using time step approach and are validated using real data and is verified that the flow/density relationship (fundamental diagram) are conserved and then state the simulator generates a valid behaviour. However, the model used in this paper uses the event oriented approach, doing more complex the process to obtain these validation graphs and their corresponding analysis. In order to validate it, was developed a library known as CiudadelaSim .
Keywords: discrete event, traffic simulation, microscopic validation, n-LNS, Petri nets
Transport and Telecommunication Institute
Lomonosova Str. 1, Riga, LV-1019, Latvia
In the analysis are represented collected data, poll opinions and their interpretation of Latvian logistics service. The focus was made for three groups of companies: manufacturing/construction companies, trading companies, logistics service providers. In research mainly analyzed micro, small and medium size enterprises. The important Latvian logistics costs (transportation, warehousing, administration) and their trends are compared with similar US logistics characteristics. The results are used in LogOn Baltic project.
Keywords: logistics, costs, indicators
Research & Production
Ltd Proezd 4806, 5, 124498, Moscow, Zelenograd, Russia
Special features of implementing an object-oriented technology for the integration of navigation sensors in strapdown inertial satellite systems( SISNS) are considered. A block diagram of the object-oriented hardware support and object-oriented mathematical-software support for the SINS-1000 system built around fiber-optic gyros is given. The results of testbed experiments of the SINS-1000 system are presented, which corroborate the fact that it is possible and expedient to apply the proposed technology to the creation of different-purpose SISNSs which can be made to order.
Keywords: navigation systems, fiber-optic gyros, object-oriented technology, half-scale modeling
Belorussian National Technical University
Nezavisimosty avenue, 65, Minsk, 220013, The Republic of Belarus
Tel.: +375 2312968.
Fax: +375 2373631.
The analysis of the developed system of increase of road traffic safety in the city centres of road accidents is resulted. The block diagram of the given system has been received; lacks of the existing position are reflected. The description of necessary actions for creation of methodological base of increase of road safety of traffic in the city centres of road accidents in Byelorussia is performed. In the article substantive provisions on the road traffic organisation in the city centres the road accidents, which are based on the account of all kinds of losses in road traffic and an estimation of quality of accepted decisions are resulted. Practical, scientific and scientifically-methodical problems on creation the system of safety increase of road traffic are defined.
Keywords: losses in road traffic, methodology of accident forecasting, accident losses, forecasting methods
Transport and Telecommunication Institute
Lomonosova Str.1, Riga, LV-1019, Latvia
This work, by making specific references to investigation of ecological problems shows the legitimacy of two approaches: the apparatus of the theory of chance and mathematical statistics and the conceptually alternative approach connected with using the apparatus of the theory of differential equations in partial derivatives and equations of mathematical physics. The investigation comes to the conclusion that the second approach manages to penetrate deeper into the physical essence of the examined phenomena and yielding analytical results directly connected with the physical aspect of a particular process. Investigators face the prospects of receiving precise or approximate results with respect to the process in its dynamic development; they also get the possibility of forecasting the course of a particular physical phenomenon without the necessity of collecting a huge volume of statistical data. The second approach is deeper and more comprehensive – for example, if problems of motor traffic ecology are to be solved. On the other hand, the expediency of using approaches of the theory of chance and mathematical statistics is not argued. The two approaches, not conflicting with each other, are useful and mutually complementary. The task of the author was to show the legitimacy and the advantages of using a powerful apparatus of mathematical physics in cases where only the apparatus of probabilistic approaches is currently used as a rule.
Keywords: anthropogenic pollutions, exhaust gases, mathematical statistics, dynamics, partial differential equations, mathematical physics equations