Vol 7, No 2 (2009)
- Year: 2009
- Articles: 19
- URL: https://journals.eco-vector.com/2073-3909/issue/view/3230
Articles
NEW TECHNOLOGIES OF CRYPTOGRAPHIC PROTECTION OF THE INFORMATION WITH USE OF ELLIPTIC CURVES
Abstract
In article the technology of construction cryptosystem, based on perspective elliptic curves with representation and information processing in system of residual classes is considered. The offered approach allows to provide high speed and reliability of enciphering of the information.
Infokommunikacionnye tehnologii. 2009;7(2):8-12
8-12
ALGORITHM FOR OPTICAL FIBER CHROMATIC DISPERSION CALCULATION BASED ON FULL-VECTORMIXED FINITE ELEMENT METHOD
Abstract
We present algorithm for optical fiber chromatic dispersion method calculation based on full-vector mixed finite element method. Algorithm potentialities are demonstrated on the samples of calculations for microstructured fibers. Correctness of estimations is confirmed by comparing to known solutions and experimental data.
Infokommunikacionnye tehnologii. 2009;7(2):13-20
13-20
STABILIZATION CHARACTERISTICS OF OSCILLATOR BASED ON MULTIMODE NONLINEAR DYNAMICS SYSTEMS
Abstract
The approach of multimode nonlinear dynamic systems stabilization on an example of oscillator, on the base of generalized multimode models is considered. It is shown, that several methods to nonlinear dynamic systems division into modes enables to consider the problem of stabilization from various positions. Two approaches of Lorenz dynamics system stabilization problem, providing required behavior of such system is considered.
Infokommunikacionnye tehnologii. 2009;7(2):18-20
18-20
MATHEMATICAL METHDS OF FORMATIONMULTIALPHABETIC CODES OF REPLACEMENT
Abstract
In the suggested cipher each symbol (the letter, a punctuation mark, number) is replaced with two real numbers. These two numbers are top and bottom limits of the determined integral. Value of integral is used that under the table of replacements to define, to what symbol of a open text there corresponds the calculated value of integral. It is supposed, that the kind of sub-integral function and a configuration of the table of replacements are known only to authorized representatives on the transmitting and reception sides. In each session of communication the table of replacements and sub-integral function are defined by a confidential key.
Infokommunikacionnye tehnologii. 2009;7(2):21-25
21-25
WIRELESS MESH-NETWORKS OF A SPECIAL PURPOSE
Abstract
Now the most widespread technology of wireless access which is everywhere applied to transfer of a considerable quantity of the traffic of a various kind, the standard of wireless local networks IEEE 802.11 is. The mesh-networks described in standard IEEE 802.11s became one of the most perspective directions of development of technology Wi-Fi. In article possibility of application of the given standard for forces of a special purpose and work of one of known algorithms of appointment of channels in networks IEEE 802.11s-Hyacinth with the centralized way of appointment of channels is considered.
Infokommunikacionnye tehnologii. 2009;7(2):25-37
25-37
OUTAGE PROBABILITY IN CELLULAR MOBILE RADIO IN THE CONDITIONS OF SIGNAL AND INTERFERERS FADINGS
Abstract
Outage probability provides a fundamental performance measure of the grade of service for cellular mobile radio systems. Now effective techniques to determine outage probability are based on the Nakagami distributions. However the most general model of signals fading in a cellular mobile radio system is model with quadriparametrical distribution of amplitudes. In this paper, a new technique is presented, which is based on the quadriparametrical descriptions of signal and interferers fading. Exact precise formula for probability of outage.
Infokommunikacionnye tehnologii. 2009;7(2):27-31
27-31
HIGH-SPEED SYSTOLIC FAULT-TOLERANTPROCESSORS OF DIGITAL SIGNAL PROCESSING FOR INFOCOMMUNICATIONAL SYSTEMS
Abstract
Computational systolic model for orthogonal signal transformation in extended Galois GF(pv) fields based on polynomial system of residue classes is examined. Modular codes' ability to increase fault-tolerant characteristics is proven.
Infokommunikacionnye tehnologii. 2009;7(2):31-47
31-47
THE PROBLEMS OF WORK QUALITY CONTROL OFCOMMUNICATION NETWORKS UNDER CONDITIONSOF NEXT GENERATION NETWORK EQUIPMENT AVAILABILITY
Abstract
The article deals with the problems of work quality control of communication networks under conditions of TDM and NGN equipment availability. There has been made an analysis of the existing and possible work quality indices of the communication networks. The method of selection of the most meaningful indices from the position of how to control the communication network work quality has been suggested.
Infokommunikacionnye tehnologii. 2009;7(2):38-41
38-41
OPTIMIZATION OF THE BASE STATIONS NUMBER IN CASE OF STRONG-CROSSED COUNTRY SIDE
Abstract
In the article the technique of optimization of number of base stations and their aerials height for cellular communication is offered. The technique is based on a mathematical apparatus of differential geometry and tensor calculations.
Infokommunikacionnye tehnologii. 2009;7(2):41-46
41-46
INVESTIGATIONS OF FIBER ATTENUATION INCREASING DUE TO OPTICAL CABLE TIGHTBUFFER DEFORMATIONS
Abstract
We present results of experimental investigations of optical fiber attenuation increasing due to optical cable tight buffer deformations. Empirical ratios for calculation of tight buffer acceptable deformation via an additional loss criterion were obtained, and experimentally verified.
Infokommunikacionnye tehnologii. 2009;7(2):46-50
46-50
SECONDARY COMPACTION OF NONSTATIONARY SIGNALS USING CRITERIAL METHODS
Abstract
Criterion task solution of signal synthesis and extraction for nonstationary secondary channel is examined. This channel allowing to transmit additional information within the bounds of existing channels in telecommunication systems with nonstationary signals.
Infokommunikacionnye tehnologii. 2009;7(2):50-56
50-56
ANALYSIS OF TWO-LEVEL INFORMATION SYSTEMWITH DATA REPLICATION
Abstract
Distributed information system (IS) is considered with main (central) database (MDB) and collection of local databases (LDBs) at remote user workstations. With the help of asynchronous replication mechanisms a copy of certain part of MDB is maintained in each LDB. Mathematical model for analyzed system is presented and by means of this model it is demonstrated that under certain conditions the presence of local data decreases the mean duration of query processing and reduces as well expenses for data transmission between separate elements of IS.
Infokommunikacionnye tehnologii. 2009;7(2):56-60
56-60
AUTOMATIC SYNTHESIS SYSTEM DEVELOPMENT FORINTEGRATED DIGITAL/ANALOG CONVERTERS
Abstract
Integrated Digital/Analog Converters (DAC) design problem is considered. Design automation methods based on parametric optimization, circuit simulation and expert systems is proposed. Automatic design system DAC Compiler is designed using proposed methods. There is a capability to integrate considered system to Cadence(R) Virtuoso Design Environment System.
Infokommunikacionnye tehnologii. 2009;7(2):61-63
61-63
PROGRAM REALIZED SIMULATION MODEL OF QUEUINGOF THE GENERAL VIEW
Abstract
In operation process of cloning of system operation of queuing of general view GI/G/m/k, its program implementation on the basis of digital-event the approach, and also verification of this program system are considered. Results of calculations of its main characteristics depending on the value of loading, coefficients of a variation of allocation of a holding time and arrival for a wide range of change of parameters of the traffic are resulted.
Infokommunikacionnye tehnologii. 2009;7(2):63-68
63-68
SCIENTIFIC-RESEARCH INSTITUTE'S ACTIVITY: FIGHT AGAINST WORLD ECONOMIC CRISIS
Abstract
The purpose of this work: the applying of busyness processes' reengineering technology to enhance the efficiency scientific-research institute activity. The practical value of this work consist in the using of new informational technologies such as reengineering that allows to scientific-research institutes perform the thorough analysis of existing system activity processes, get one's hand in conditions of serious competition and also enhance the efficiency of their work and maximize the obtained financial result.
Infokommunikacionnye tehnologii. 2009;7(2):69-73
69-73
73-78
SUBSTANTIVE PROVISIONS OF THE TECHNIQUE OF DEFINITION OF THE LOCATION OF THE NETWORK OF THE REMOVED INTERCONNECTED RADIOCENTERS - RETRANSMITTERS
Abstract
Offers on introduction in a hybrid wireless communication network of means of a radio communication decameter a range are considered. For increase of efficiency of functioning realization of the mechanism of use of a spatial resource of a short-wave radio communication is offered.
Infokommunikacionnye tehnologii. 2009;7(2):79-82
79-82
ENERGY PARAMETER OF EFFECTIVE HIGH QUALITY DIGITAL AUDIO SIGNALS COMPRESSION
Abstract
The article highlights the ways of improving the quality of digital audio signals compression. The author focuses on the question how to range bits while coding the coefficients of discrete orthogonal transformations. The process of bits rate ranging is presented as necessary and sufficient for providing high-quality perception of the decoded audio signals. The work focuses on the process of bits ranging for different audio signals bands.
Infokommunikacionnye tehnologii. 2009;7(2):82-87
82-87
87-92