Begell House Inc.
Journal of Automation and Information Sciences
JAI(S)
1064-2315
34
2
2002
Synthesis of Compromise-Optimal Trajectories of Mobile Objects in Conflict Environment
8
10.1615/JAutomatInfScien.v34.i2.10
Albert N.
Voronin
National Aviation University, Kiev, Ukraine
Alexander G.
Yasinsky
Institute of Space Research of National Academy of Sciences of Ukraine and National Space Agency of Ukraine, Kyiv, Ukraine
Sergey A.
Shvorov
National Center of Defence Technologies and Military Security, Kyiv, Ukraine
A problem of synthesis of a compromise-optimal trajectory of a mobile object in conflict environment is studied. Solution of the problem by the method of multicriteria dynamic programming is described. A modified method of multicriteria dynamic programming is suggested. Here, search of the optimal point at each level is performed by the method of dual programming (non-local approach). Possible approaches to solution of the problem of structure optimization of active conflict environment are analyzed.
Model of Stochastic Systems and their Connections on the Petri Nets Basis
5
10.1615/JAutomatInfScien.v34.i2.20
Svetlana A.
Kachur
Sevastopol State Technical University, Ukraine
Extension of stochastic Petri nets which allows one to describe in terms of these nets the dynamics of Non-Markov processes of stochastic systems random structure is given. Elements (stochastic subsystems) of these systems have probabilistic relations. Novelty of the proposed model is defined by making simple Petri nets structural changes (introduction of restrictive event hyperarc), transition operation rules, set of additional attributes and their interrelation. Models can be applied as a base for analysis and synthesis of automatic control and complex systems under uncertainty conditions.
Regulation of the Dynamics of a Carrying Body Using the Cycloidal Damper of Forced Oscillations with Dry Friction
8
10.1615/JAutomatInfScien.v34.i2.30
Victor P.
Legeza
Ukrainian State University of Food Technologies and National University of Life and Environmental Sciences of Ukraine, Kiev
We consider the forced vibrations of the vibro-protective system of rigid bodies "a heavy cylinder at the cycloidal depression of a carrying movable body", allowing for side forces of dry Coulomb friction, under the action of a periodic external excitation. The dynamic equations of joint motion of the cylinder at the cycloidal depression without slip and carrying body have been formed and numerically investigated. We obtained the graphic chart of the maximum amplitude of the carrying body upon the value of the dry friction coefficient
The Documents Selection Method for Information Retrieval Results Presentation
7
10.1615/JAutomatInfScien.v34.i2.40
Alexey G.
Dubinskiy
Dnepropetrovsk National University, Ukraine
There is a problem of organization and visualization of the results of information retrieval in case if the search query is not identical with a user needs. The new method for excluding the similar documents from results list and keeping only the documents from different subject groups is provided. The procedure of thinning can rebuild results list from linearly organized sequence of documents to the tree graph structure. The approximate number of calculations in a selected rule for detection the similar documents groups was estimated. There is an experimental confirmation of this value. This method was employed in Internet meta-search program.
On Raising Efficiency of Realization of Iterative Grouping Methods
5
10.1615/JAutomatInfScien.v34.i2.50
Nikolay A
Ignatyev
National University of Uzbekistan, Tashkent, Uzbekistan
The paper suggested the ways for efficient realization of iterative grouping algorithms based on elimination from consideration those initial partitions which undoubtedly do not produce new groups and a direct selection of objects which are the candidates for transition from one group into another.
An Algorithm of Realistic Coloring Projections of the Quadric Surfaces
6
10.1615/JAutomatInfScien.v34.i2.60
Igor V
Gaidaichuk
Chernovitsy National University
Alexander V
Bestsenny
Chernovitsy National University, Ukraine
An algorithm of displaying the quadric surfaces on computer screen, that takes into account brightness of their parts, is suggested. The algorithm is based on finding curves along which the brightness is constant. This enables one to increase significantly the projection speed.
Closed-Form and Iterative Solutions to the Global Positioning System Problem
13
10.1615/JAutomatInfScien.v34.i2.70
Marco
Gatti
University Ferrara, Italy
Salvatore
Ponte
The Second University of Naples, Italy
Nikolla
Crocetto
The Second University of Naples, Italy
The well-known nonlinear single-point global positioning system (GPS) based on positioning determination problem is approached in this paper via a closed-form algebraic solution and an iterative computational algorithm, working in the code (or range) domain. The four user unknowns (three coordinates and the user clock bias) of the GPS single-point code-range static positioning problem are evaluated by means of pseudorange measurements and a minimal number of satellites. The presented methodologies, not needing model linearization and computation of trial (initial) values of the unknowns, provide fast and reliable initialisation of commercial GPS firmware, typically based on linearized models. The procedures are validated by analysing numerical results on real GPS measurements. Good performance and rate of convergence with respect to other methodologies found in literature testify the cost-effectiveness of our approach.
Mathematical Simulation of the Deformation of the Telescope Mirror Caused by Gravitational Force
7
10.1615/JAutomatInfScien.v34.i2.80
Lyubov V.
Maksymyuk
Institute of Space Research of National Academy of Sciences of Ukraine and National Space Agency of Ukraine, Kyiv, Ukraine
Axisymmetric deformation of the space telescope main mirror caused by gravitational force is considered. Study is based on the three mathematical models: plate, thin shell and geometrically nonlinear shell. The distribution of displacement, strains and stresses on the concave surface of the thick space telescope main mirror and the thin space telescope main mirror under different clamping were obtained by numerical simulation. It is shown that adequate model choice depends on the boundary conditions and thickness of the mirror.
Mathematical Modeling of Propagation of Action Potential Along Nerve Fiber
9
10.1615/JAutomatInfScien.v34.i2.90
Taras O.
Malinovsky
Institute of Space Research of National Academy of Sciences of Ukraine and National Space Agency of Ukraine, Kyiv, Ukraine
A mathematical model describing propagation of potential of action along a nerve fiber is studied. Main attention is paid to mathematical investigation of the system of equations. Numerical and analytical calculations are performed. Phase trajectories, obtained in the result of integration of a system with particular values of parameters, are presented.