«Systems and Means of Informatics»
Scientific journal
Volume 25, Issue 2, 2015
Content | About Authors
Abstract and Keywords.
- I. N. Sinitsyn
- V. I. Sinitsyn
- I. V. Sergeev
- E. R. Korepanov
- V. V. Belousov
- V. S. Shorgin
Abstract: Mathematical software for normal stochastic processes (StP) analytical
and statistical modeling in differential and difference (discrete) stochastic systems
(StS) on manifolds with complex irrational nonlinearities (CIRN) of scalar and
vector argument is considered. Typical CIRN and its discrepancy expansions
are presented. Equations for the normal approximation method (NAM) and the
statistical linearization method (SLM) for normal StP analytical modeling are
given. Typical NAM(SLM) integrals and software "StS-CIRN. Analysis" based
on cylindrical functions are discussed. Test examples are given.
Keywords: analytical and statistical modeling; complex irrational nonlinearity (CIRN); cylindrical functions; Hermite polynomials; module "StS-CIRN.Analysis;" normal approximation method (NAM); statistical linearizatio nmethod
(SLM)
- I. N. Sinitsyn
- I. V. Sergeev
- V. I. Sinitsyn
- E. R. Korepanov
- V. V. Belousov
- V. S. Shorgin
Abstract: Algorithms for synthesis of discrete conditionally optimal (Pugachev)
filters (PF) for normal processing in continuous and discrete linear and nonlinear
hereditary stochastic systems (HStS) with Wiener and Poisson noises are considered. Introduction is devoted to the survey of analysis and modeling problems
in HStS. It is stated that for real time processing, problems in informatics
and control PF are effective in computer realization. The theorems for HStS
reduction to differential StS and discrete StS are presented. Also, the theorems
for discrete PF synthesis for normal processing in linear and nonlinear HStS are
given. The HStS test shock examples for software tools "IDStS-Filtering" are
represented.
Keywords: differential stochastic system (DStS); linear Kalman filter (KF):
linear Pugachev filter (PF); software tools "IDStS-Filtering;" method of normal
approximation (MNA); statistical linearizationmethod (SLM); normal stochastic
process; shock (impulse) noise; hereditary (integrodifferential) stochastic system
(HStS); MATLAB
- N. D. Leontyev
- V. G. Ushakov
Abstract: The paper studies two discrete-time single server queueing systems
with infinite capacity and feedback. The arrivals in both systems are driven by
discrete autoregressive models, i. e., the size of each arriving batch may be equal
to the size of one of the previously arrived batches with some fixed probability, or
is a random variable independent of the history with complementary probability.
The main object of the study is the stationary queue length. For the system
with discrete autoregressive arrivals of order 1, expressions for queue length
distribution are derived, and for the system with discrete autoregressive arrivals
of order 2, the expected queue length is found.
Keywords: queueing theory; discrete-time queueing systems; discrete autoregressive model; batch arrivals; feedback
- E. O. Karpukhin
- V. V. Karnacov
- S. V. Filipkov
Abstract: This paper considers the main approaches to the assessment of efficiency
transport layer protocols in modern information and telecommunication systems
that implement the congestion control mechanism. The analysis of existing
modeling tools for transport layer protocols was carried out, based on which it
was concluded that it is impossible to fully take into account the peculiarities of
simulation process data. The paper illustrates the main steps of development of
the specialized software model in the .NET Framework. The paper proves the
value of the sales model based on comparison of the resulting simulation results
with existing estimates data rate at the transport layer using the TCP protocol.
Keywords: transport layer; congestion control; TCP; protocol optimization of
data-driven interaction; specialized programming model; hijacking
Abstract: Existing symmetric encryption algorithms require storage of the secret
key. Stored keys are often protected by poorly selected user passwords or pin-
codes. Combining biometrics with cryptography is often assumed as a possible
solution. This paper describes a novel method for transforming an online
biometric signature into a binary vector, which can be used as a cryptographic
key. The method is based on a secure sketch scheme and makes it possible to
construct 16-bit keys with false accept rate and false reject rate less than 10%.
Keywords: biometric cryptography; online signature; fuzzy extractor; secure sketch
- I. Kirikov
- A. Kolesnikov
- S. Listopad
- S. Soldatov
Abstract: The approach to the modeling of collective decision-making using
computer decision support systems within the synergetic paradigm of artificial
intelligence is considered. History of artificial intelligence has shown that the
methods, constructed within the paradigm of computer modeling of the processes
and phenomena in a single man's memory, are not relevant to the complexity
of the real world problems. Such problems have substantial heterogeneity,
which requires heterogeneous methods for their solution, like decision support
system widely used to solve them. In this regard, the models of the hybrid
intelligent systems taking into account coordination and consistency are proposed
as simulators of the real decision support systems. The results of computational
experiments with the hybrid intelligent systems implementing the coordination
and coherence effects are presented, demonstrating positive impact of the effects
on the quality of collective decision-making.
Keywords: heterogeneity; decision support system; hybrid intelligent system; coordination; consistency
Abstract: The article presents the innovative online service that implements
the method of cost planning taking into account the priorities of expense items.
The widest area of the service usage is budgeting, although the service allows to
plan allocation of any resource flexibly and efficiently. Client applications of
the service provide the possibility to specify an expected resource amount and
requests for expense items as numerical intervals. The planning results are also
represented by numeric intervals, and the plan is adjusted in the course of its
implementation. This approach has a great practical importance. The article can
be useful for experts on the distribution of corporate and government resources,
teachers, graduate students, software developers, and vendors.
Keywords: cost planning; budget planning; resource allocation; online service; SaaS
- A. V. Bosov
- E. S. Gress
- A. V. Naumov
Abstract: The article deals with the automation of the analysis of the quality
of education in universities. An original algorithm for counting students rating
is proposed. Statistical analysis of the sessional rating (marks obtained) and
results of the students ranking analysis on the basis of actual data processing
are presented. The ways to use the assigned rating, in particular, to encourage
(deductions) students and quality control measures are suggested.
Keywords: rating system; quality of education; academic performance of students; statistical criteria; information system
Abstract: This article presents information resources used in contrastive linguistic studies and their principle features. There are two main types of such
information resources: typological databases and electronic text corpora. This
paper is focused on the latter. There are two types of corpora, which are
particularly relevant for contrastive studies: comparable corpora - balanced
collections of original texts in the languages compared and parallel (translation)
corpora - collections of original texts in one of the compared languages aligned
with their translations into other compared language(s). In addition to description of the existing information resources of contrastive linguistic studies, this
paper introduces a new type of such resources, which are termed here as corpus
extension databases. The article outlines features of such databases in comparison
to electronic corpora and justifies the necessity for creating them.
Keywords: linguistic studies; databases; typological databases; comparable corpora; parallel corpora; corpus extension databases
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