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scientific edition of Bauman MSTU

SCIENCE & EDUCATION

Bauman Moscow State Technical University.   El № FS 77 - 48211.   ISSN 1994-0408

Informatics, Computer Science and Management

Models and algorithms of multicriteria optimization of AIS with fuzzy information
# 06, June 2012
DOI: 10.7463/0612.0369542
O.I. Lisov, A.B. Markov
The paper describes the formalization process of optimization of automated information system’s quality based on fuzzy logic, information system model as an object of optimization in terms of population genetic, genetic algorithm with fuzzy model for optimization, and also methods of conversion of the population with usage of heuristic algorithms.
Quasi-genetic algorithm for optimization of automated information systems structure
# 05, May 2012
DOI: 10.7463/0512.0369022
O.I. Lisov, A.B. Markov
 The proposed algorithm considers accumulated experience both of automated information system (AIS) designing and evolution modeling principles, in particular, simultaneous consideration of a few versions of AIS construction and their comparison. Ways of further improvement of the AIS structure were determined. The structure should match many criteria of optimality.
77-30569/367724 Admissible spatial trajectories of the unmanned aerial vehicle in a vertical plane
# 03, March 2012
A.P. Krishchenko, A.N. Kanatnikov, S.B. Tkachev
Trajectory planning problem of the unmanned aerial vehicle (UAV) was considered in this article. UAV should flied by the preset traveling points during the preset moments of time. State and control variables were also restricted.The main problem is to find the permissible trajectory, which satisfy given restrictions. The approach based on design of a trajectory from a certain set of sample maneuvers was proposed. These maneuvers were formed with use of a combination of analytical methods of trajectories calculation, methods of mathematical simulation and various heuristic algorithms.The sequence of traveling points breaks required trajectory into segments. Essential simplification of the problem can be obtained by the demand that calculation of the trajectory segment does not affect on calculation of the subsequent segments and depends only on values of state and control variables of UAV obtained on the previous segment. In this case planning of a trajectory was carried out consistently, from one segment to another.In this paper the maneuver planning problem of an echelon change was solved. This maneuver in a combination with rectilinear uniform movement allowed to plan those segments of a UAV trajectory where movement can take place in the vertical plane, i.e. with constant value of a traveling angle.The nonlinear mathematical model of UAV movement as material point in the trajectory coordinates was described. The proposed method of the solution of a terminal problem was based on usage of polynoms on time. Two heuristic algorithms of maneuver planning of echelon change were described. Examples were included. Results of simulation and the scheme of testing of proposed planning method were presented.
77-30569/363023 Review: population methods of Pareto set approximation in multi-objective optimization problem
# 04, April 2012
DOI: 10.7463/0412.0363023
A.P. Karpenko, A.S. Semenikhin, E.V. Mitina
This authors present a review of numerical methods of approximate Pareto set generation in the multi-objective optimization problem. The following methods are discussed: "naive" methods, switching objective functions methods, methods of objective functions aggregation, methods based on ranking of population agents, and other methods. All cases referred to methods involving the use of genetic or swarm algorithms, such as particle swarm optimization algorithm.
Analysis of approaches to formation of expert group membership focused on preparing and making decisions.
# 05, May 2012
DOI: 10.7463/0512.0360720
V.M. Postnikov
 The article considers the analysis of existent approaches to formation of quantitative and qualitative membership of decision-making working group. The author presents a review of approaches focused on selection of quantitative membership of expert working group. Analytical expression allowing to determine boundary values of quantitative membership of expert working group was obtained by way of this review. Estimation of competence of both single expert and the whole group was considered and a set of overall indexes for competence estimation was proposed.  The author gives recommendations on organization of expert groups producing coordinated, high technology and cost effective decisions.
77-30569/359383 Estimation of steganographic algorithms undetectability
# 03, March 2012
A.V. Remizov, M.V. Filippov
The authors propose formal criteria of estimation of steganographic algorithms in the context of undetectability of hidden information by the opponent. A method of creating optimal detection methods is also presented in the article. The article also contains the results of the analysis of known and prospective stenographic algorithms operation with the usage of methods constructed in this manner.
77-30569/359132 Influence of initial conditions and time of simulation on characteristics of conditional non-stationary processes
# 04, April 2012
D.V. Stroganov, A.A Solncev, P.S. Yakunin, R.V. Batov, A.A. Karasev
In the article a provisionally non-stationary Gaussian process was proposed for analytical research of simulation processes convergence. This Gaussian process was considered as a stationary Gaussian process with a specified pre-history. The authors studied dependence of medium-integral estimation on different factors. It was shown that the trend of the medium-integral estimation had a lasting character, contains a significant systematic error at the initial stage and depends on the process correlation, initial values and time of simulation.
77-30569/355664 Application of wavelet-transforma for analysis of spectrograms obtained with Auger spectrometer
# 04, April 2012
T.N. Romanova, M.V. Plaksina
 The method of Auger-electron spectroscopy for studying the content and structure of a solid body external surface is considered in this article. The authors propose a procedure of clearing the electronic spectrum from noise, based on the wavelet-transform. A comparative analysis of the quality of clearing for three types of wavelets was carried out.
77-30569/355792 Co-hybridization of PSO
# 04, April 2012
DOI: 10.7463/0412.0355729
E.Yu. Vorob'eva, A.P. Karpenko, E.Yu. Seliverstov
This article deals with co-algorithmic hybridization of two Particle Swarm Optimization (PSO) algorithms, using click-type and ring-type neighborhood topologies of particles. Each of these topologies has their disadvantages which can be eliminated by using co-algorithmic hybridization. The authors compared the efficiency of canonical PSO and its co-algorithmic modification and found optimal values of free parameters.
77-30569/354740 Mathematical simulation of temperature fields considering phase transitions in cryolithic zone
# 04, April 2012
D.A. Krylov
One of the most dangerous processes that reduce stability of constructions in permafrost is seasonal soil thawing and heat accumulation beneath buildings. This paper describes a three-dimensional mathematical model for analyzing and forecasting temperature distribution under buildings subject to seasonal temperature fluctuations. An example of calculation of a temperature field under a building is included in the article. The developed model and software package can be used for geotechnical investigations at any stage of construction projects in the permafrost zone.
77-30569/355371 Approximation of integral mean estimations of transient regimes of simulated models of queuing networks
# 03, March 2012
V.M. Prihod'ko, D.V. Stroganov, P.S. Yakunin, E.S. Moskvichev, A.A Solncev
This article deals with the problems of estimation of the character of autocovariance functions and trends of typical output simulated processes, which are necessary when investigating the convergence of search optimization algorithms on simulated models. In order to determine the function class of output simulated processes, simulation of typical structures of queuing networks was conducted, namely disconnected single- and multi-phase queue systems with different service procedures and closed-loop single- and multi-phase queue systems with sources of various population and service procedures.
77-30569/353914 Estimation of influence of harmonic interference on phase locked loop.
# 04, April 2012
B.I Shahtarin
The harmonic interference affecting the phase locked loop can cause a number of unwanted effects, reducing stability of the phase locked loop and distorting the information contained in the incoming signal. Several dynamic characteristics of phase locked loop were obtained by the method of harmonic balance, under the stipulation that the frequency of harmonic interference lies outside the phase locked loop synchronization band.
Strategy of group query of sensors in monitoring networks
# 05, May 2012
DOI: 10.7463/0512.0351666
N.E. Bogomolova, A.Yu. Malikov
This article deals with the strategy of group query of sensors in wireless monitoring networks. The authors proposed a mathematical model of monitoring networks; construction algorithms of matrix query were obtained. The results of network numerical simulation in the case of changing of various parameters of the model are included in the article.
77-30569/349781 Analytical model of estimation of organizational structures operation for operational inquiry processing systems
# 04, April 2012
V.M. Postnikov, M.E. Postnikov
The authors propose a simple analytical model for estimation of performance characteristics of organizational structures of customer inquiry in-line processing systems formalizing as a multiple channel queue systems.
77-30569/349943 Development of software for automatic rotation of landscape photographs in order to eliminate departures from horizontal or vertical lines
# 04, April 2012
A.E. Shivarov, V.V. Inflyanskas
The authors analyzed possible distortions of photographs caused by the camera tilt; known software allowing to rotate the photographs were also analyzed; the urgency of development of automatic rotation method is shown. The authors propose a method of automatic determination of the rotation angle for elimination of departures from horizontal or vertical lines in landscape photographs. Software solution was implemented for automatic rotation of photographs with the usage of the proposed method.
77-30569/350020 Recognition of text image subject to word morphology
# 04, April 2012
I.V. Rudakov, A.S. Romanov
Algorithms of auto-correction in documents were analyzed. The authors proposed a method of correcting grammar mistakes by means of a morphological analysis. The authors present a bundled software allowing to recognize text images by means of neural network and to correct mistakes with the usage of the proposed method. Creation of a special storage for the dictionary allowed to increase productivity and decrease the complexity of word selection for the operation of the bundled software. The dependence of correction accuracy on the mistake location in the word was identified.
77-30569/350058 Method of mistake reduction in expert systems of interactive training systems
# 04, April 2012
K.A. Maikov, S.M. Jiryakov
 The authors propose a reduction method of fuzzy output mistakes in production expert systems (ES); this method doesn’t require modification of initial expert knowledge base. Sugeno algorithm was taken as a foundation of the proposed method. Error correcting at the stage of logic output using Faber-Schauder functions allowed to correct the fuzzy solution according to the requirements of control precedents without changing the initial definitions in the knowledge base of ES. The advantages of the Sugeno modified algorithm are shown by the example of ES for assessment of an airplane maneuver.
77-30569/345396 Analysis of properties of quasioptimal and optimal algorithms for the spacecraft spatial reorientation
# 02, February 2012
M.A. Velischanskii
The author presents a comparative analysis of two various approaches to the synthesis of control algorithms for spatial reorientation of a spacecraft. One of such approaches is based on the concept of inverse problems of dynamics, which allows of synthesizing smooth programmed control, building controls which stabilize program trajectories, considering restrictions and carrying out numerical optimization of a trajectory by the chosen criterion. The second approach is based on the synthesis of optimal program control using the Pontryagin maximum principle. The results of numerical simulation are provided in the article. The comparative analysis of the received results is also included.
77-30569/345425 Approaches to identification of center-of-mass motion models in space rockets
# 03, March 2012
A.V. Proletarskii
The article considers methods of identification of center-of-mass motion models in space rockets. Reducing the task of identification to a two-point boundary-value problem is shown for the purpose of unification of program-algorithmic support in the control system.
77-30569/348787 Supersonic flutter analysis for axisymmetric shell with meridian as a spline, based on SolidWorks API
# 04, April 2012
M.V. Chugunov
The problem of the supersonic panel flutter for the axisymmetric shell was solved with Mach numbers, above 1.7. This shell was an element of a complex structure, and its meridian was formed with Bezier-spline. FEM was used for the analysis. Aerodynamic pressure was calculated according to the piston theory, but a flow density and velocity had local values corresponding to the non-uniform flow. These parameters were defined by SolidWorks FlowWorks Simulation code, and functions, which were necessary for the analysis of a flutter problem, i.e. formation of the asymmetrical eigenvalue problem, and the analysis of the behavior of the eigenvalues was added to SolidWorks as the AddIn-module with usage of the COM-interface, based on API SolidWorks and API FlowWorks Simulation. The examples are included in this article to illustrate the technique.
 
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