Systems and Means of Informatics scientific journal
Volume 27, Issue 1, 2017
Abstract: Analytical modeling methodological support and corresponding algorithms for normal (Gaussian) stochastic processes in differential stochastic systems (StS) with Jacobian elliptic nonlinearities based on statistical linearization and normal approximation methods are presented. Dynamics of Jacobian oscillator in stochastic media is the basis of the test example. Necessary information about elliptic integrals and elliptic Jacobi-functions and statistical linearization coefficients of basic Jacobian nonlinearities are given. The results may be generalized to other types of elliptic functions and functions related to them.
Keywords: analytical modeling; method of normal approximation (MNA); method of statistical linearization (MSL); Jacobian elliptic nonlinearity; Jacobian elliptic oscillator
PARAMETRIC ANALYTICAL MODELING OF WIDE BAND PROCESSES IN STOCHASTIC SYSTEMS WITH UNSOLVED DERIVATIVES
Abstract: Methods of parametric analytical modeling (AMM) of stochastic processes in finite dimensional nonlinear stationary and nonstationary stochastic systems with unsolved derivatives are presented. Such models describe technical systems in control and informatics if one neglects transient processes. For analytical modeling and accuracy and sensitivity analysis, the author developed autocorrelated methods based on normal approximation and statistical linearization (NAM and SLM), orthogonal expansions (OEM), and other parametric methods for one- and multidimensional densities. Special attention is paid to AMM for discrete systems by OEM based on the Poisson distribution. Typical nonlinearities with unsolved derivatives and statistical linearization coefficients are given. Test examples are discussed. Algorithms are the basis of experimental software tools for safety and reliability analysis of technical systems that are being developed by the authors.
Keywords: accuracy and sensitivity analysis; analytical modeling method; normal approximation method (NAM); one- and multidimensional densities; orthogonal expansions method (OEM); statistical linearization method (SLM); stochastic process (StP); stochastic system (StS); stochastic system with unsolved derivatives
LAYOUT OF AN INTEROPERABLE INFORMATION-ANALYTICAL SYSTEM FOR SPATIAL AND SEMANTIC SEARCH AND ANALYSIS OF GEODATA
Abstract: The paper describes the principle of operation and the functionality of the layout of an interoperable information-analytical system designed to perform the tasks of spatial and semantic search and analysis of geographic data by the example of landforms and elements of a hydrographic network on the basis of the model of interoperability proposed by the authors. To search geoimage data in arrays, the authors use an approach taking into account not only text, but also visual descriptors, reflecting the substantial and visual (shape, color, and texture) features of natural geoobjects, processes, or phenomena. The authors created a fragment of a verbal-graphic thesaurus containing visual descriptors of objects of the hydrosphere and designed the layout of the search engine used to search geoobjects in a repository of geospatial information. The layout of the system was developed in Microsoft Visual Studio 2008 and operates using Microsoft SQL Server 2005.
Keywords: geodata; semantic geo interoperability; ontologies; Semantic Web
Abstract: It is known that mixed probability models allow high-performance data-flow analysis in the information systems. However, the resulting estimated parameters of the model can vary significantly depending on the actual realization of algorithms. To solve this problem, the heterogeneous computing service MSM Tools implementing a number of methods based on the analysis of mixed probability models has been created. This approach satisfies the requirement of necessary virtualization between the actual hardware of a researcher and that of a computing service; so, it eliminates the necessity to install any additional software, as the computing service requires only a browser to perform calculations.
Keywords: mixed probability models; moving separation of mixtures; heterogeneous computing; online service
Abstract: The issues of providing services for scientific research and approaches to the integration of services into the cloud infrastructure are discussed with the provision of a single interface for user access to scientific services to cloud services. An overview and analysis of the known categories of cloud services are presented: "Software as a Service - SaaS;" "Platform as a Service - PaaS;" and "Infrastructure as a Service - IaaS." The stages of the integration of the scientific service into cloud computing are considered. The stages of the integration of the scientific service into cloud computing are presented. The version of cloud-based IT infrastructure with hypervisor allocation is developed for unified information environment of scientific research. In general, the suggested approaches allow one to introduce and use in practice a new category of cloud services - "Research as a Service - RaaS."
Keywords: cloud service; scientific service; IT-service; information technology; information support of activities; operational and technical management; unified information environment
Abstract: Creating a fully functional model of automated information- analytical control systems is a complex scientific problem of current importance. The article proposes the implementation of the systematic approach to the solution of this problem in the subject area of case control systems based on the process approach. The article proposes and justifies the cyclic fully functional model of systems of situational management, which includes five stages: Goal setting, Monitoring, Analysis, Decision, and Action. The automated functions of the generalized control system are represented as a set of five groups of interrelated processes. The article describes the main processes of a situational control system.
Keywords: situational control system; functional model; process approach
Abstract: This paper considers the question of relatedness of natural language texts based on textual features (fragments). Two types of relatedness are revealed: first, explicit relatedness, when the texts are linked by bibliographic references, and, second, implicit relatedness, when the texts are linked through common text fragments. The advantages and applications of implicit relatedness are discussed. It is shown that the use of implicit relatedness increases the scope of text processing techniques based on relatedness of texts significantly. Measures of explicit and implicit relatedness are proposed. An experiment was conducted on a set of texts from the subj ect area of " computer graphics. " On the basis of the experiment, it was shown that both types of relatedness are correlated with each other. The authors found the parameters of text processing when the correlation was at maximum and reached about 55%. The plan for further development of the proposed method of texts comparison and refinement of the results is suggested.
Keywords: relatedness between texts; explicit relatedness; implicit relatedness; measure of relatedness; collection of texts; correlation
Abstract: The article introduces a method of packet processing in integrated network processors with conventional core architectures. Packets are processed in an internal "virtual" pipeline, with available hardware resources being its stages.
Keywords: descriptor queue; integrated network processor; packet processing; queue manager; virtual pipeline
Abstract: The approaches to increasing accessibility and improving quality of the medical care provided to inhabitants of hardly accessible and remote settlements of the Russian Federation, realized by means of mobile telemedicine units (MTU) within the project of creation of telemedicine systems (TMS) are considered. The basis of classical TMS is made by two segments interacting among themselves by means of telecommunication lines. The first segment includes a network of stationary telemedicine consulting and diagnostic centers, and the second - a set of MTU performing different functions. The analysis of possible architecture of TMS is carried out. Shortcomings of two-segment TMS, from which the main one is isolation of a system from a network of the out-patient policlinics existing in regions of the Russian Federation, are revealed. It is shown that implementation of such decision results in creation of duplicating circuits of provision of medical services to the population, transmission of a part of functions of policlinics to hospitals of TMS, violation of the rules of medical documents flow, and increase in cost of creation and operation of TMS. The paper proposes three-segment architecture of TMS, which includes existing policlinics as well as MTUs and hospitals of TMS. The proposed solution is free from shortcomings of two-segment TMS, and its functioning conforms to the existing legislation on the organization of delivery of health care to the population of the Russian Federation.
Keywords: telemedicine center; mobile telemedicine module (MTU); primary sanitarian help of the physician; telemedicine system (TMS); telecommunication center of TMS
Abstract: The article is devoted to applied aspects of information modeling in the design of information systems of complex subject areas. It provides a logic diagram of the information system design and substantial description of the basic design stages. The article presents the hybrid cascaded-round-Robin algorithm of formation of a monitoring (monitoring, command, and control) information system. This algorithm is designed to compensate for the shortcomings of the cascade and iterative paradigms of design and to ensure the quality and viability of an information system in terms of short-term planning.
Keywords: modeling of information systems; iterative development; waterfall development; conditional and unconditional links
Abstract: This work considers an application of cloud computing solving chemical kinetics problems. The designed SaaS (Software-as-a-Service) cloud service makes it possible to provide remote access to universal tools used to study kinetics and mechanisms of complex chemical reactions; to automate the mathematical modeling process, starting from the stage of reaction mechanisms preparation; to form and store experimental and reported data; and to solve kinetic problems of construction of multistage chemical processes. Solving inverse problems of physical chemistry, as well as sensitivity and uncertainty analysis, requires a considerable amount of computation; so, the use of parallel computing technologies is required. The article describes the architecture of a cloud service and shows the results of an integrated approach to modeling the inhibitory oxidation reaction of n-decane with the representation of effectiveness of parallelization calculation series.
Keywords: mathematical chemistry; cloud computing; reaction kinetics; processing experimental data; reaction mechanisms; parallel processing; inverse problems; SaaS
Abstract: The paper presents the point of view on the subject of informatics and its research areas, which are actual at the present stage (2017-2020). Informatics is considered as a science of extracting information from messages, creating information resources, programming machines behavior, and other activities associated with the construction and usage of human-machine environment for solving problems of modeling, design, interaction, learning, etc. Scientific products of informatics are considered as a methodological support of constructing a human-machine environment for solving problems in various areas. Definitions of key concepts of informatics are proposed (message, data, information, model of a concepts system, etc.). The research areas of current interest are determined: automated calculations; programming; human-machine environment for solving problems (s-environment); perception and representation of messages; interaction in s-environment; information resources and systems for solving problems in s-environment; information security and cryptography, etc.
Keywords: informatics; information; information resources; knowledge system; human-machine environment of problem solving; computing automation; programming; informational interaction; artificial intelligence
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