Systems and Means of Informatics scientific journal
Volume 26, Issue 1, 2016
Abstract: This article discusses sparse buffers - address ranges in computer's virtual memory, for which mapping to the physical memory is partially or completely absent. Such buffers are intended for use in subroutines to transfer to them input data or to obtain from them output data so that when a subroutine reads or writes data at addresses for which no physical memory is allocated, a registered exception handler is called that allocates physical memory for virtual memory fragment to which access has been made, and in the case of reading data fills that memory with the necessary data. Actions made by a subroutine handler do not affect the execution of the subroutine, i.e., are transparent to it. This mechanism allows avoiding unnecessary allocation of physical memory when the amount of read or written data is less than the provided buffer's size and, in the case of reading the data, allows saving the CPU time required to fill the buffer with portions of data that would not be used by the subroutine.
Keywords: informatics; virtual memory; memory buffer; subroutines; reducing memory usage; reducing CPU time usage
Abstract: The paper deals with the problem of the availability and efficiency of advising highly specialized care for patients of regional health centers, serving a vast region of the Russian Federation with low average density of population by the example of the Krasnoyarsk region. It is proposed to solve this problem with the help of a medical information system "Virtual clinic," which implements the following principles of flow control of remote patients: differentiation of patients by type of advice (full-time or part-time consulting), distance forming a route sheet to provide full-time advice to the patient of intraregional clinics, and remote distance counseling. The paper presents the rationale of the proposed approach as a result of the structural and functional domain modeling methodology SADT (Structured Analysis and Design Technique). The paper contains the results of the simulation of patient flow control in the form of a data flow diagram in a graphical notation IDEF0 AS IS and TO BE. The paper reveals the features of the remote absentee counseling and individual route planning of the patient in the clinic at the regional level by the example of the Krasnoyarsk Regional Hospital. The paper contains the description of the "Virtual clinic," which reflects the composition and functions of the system, data presentation, user category, methodical and financial aspects of implementation, and monitoring tools accessibility provide advice. The paper describes the experience of the introduction of the "Virtual clinic" medical information system in the regional consultative clinics and 134 medical organizations of the Krasnoyarsk region sending patients for consultation to the regional hospital.
Keywords: medical information systems; remote consulting; patient flow control; individual patient routing; virtual clinic
ALGORITHM AND PROGRAM COMPLEX FOR ANALYSIS OF THE CHARACTERISTICS OF PLASMA RELATIVISTIC ULTRAHIGH FREQUENCY GENERATOR OUTPUT RADIATION.
Abstract: The article proposes a method for processing experimental results obtained from plasma relativistic ultrahigh frequency (UHF) generator (PRG). For gathering information about a PRG output radiation spectrum with high time and frequency resolution, the authors use wavelet transformation and digital filtration of signal, presenting output radiation of PRG. The program has been written in the MATLAB language in the MATLAB 7.0 environment. The sampling interval of the PRG output signal is equal to 50 ps. The plasma relativistic UHF generator, built on Sinus 550-80 accelerator, has some unique properties: PRG has a single impulse mode and a multiple impulses mode (up to 50 pulses per second); PRG can generate pulses with durations of 80 ns and frequency band lying in 2 to 25 GHz area of spectrum; PRG can generate an UHF radiation in single frequency and multifrequency modes. By alteration of starting parameters such as plasma density, one can switch between different PRG work modes and, by that, one can regulate some of radiation characteristics such as carrier frequency or bandwidth or other. To make control of PRG output radiation possible, a complex of program and signal-gathering devices were created. The relation between different initial parameters of experiment and PRG output radiation spectral characteristics needs to be investigated.
Keywords: analysis of numerical data; algorithms; time series; Fourier transformation; wavelet transformation; UHF radiation; plasma relativistic UHF generator
THE EXPERIMENTAL ANALYSIS OF THE METHOD OF CLUSTERING AND RANKING OF MULTIDIMENSIONAL DATA USING THE KOHONEN NEURAL NETWORK.
Abstract: The paper proposes a methodology of clustering and ranking data using the Kohonen neural network based on space-correlation properties of a training sample regardless of the network learning algorithm. The possibility of applying the promising method of linear transformation of training samples coordinates for clustering weakly correlated spatially inseparable data is shown experimentally. The paper demonstrates the usage of ranking to highlight the border instances and define the level of closeness to neighborhood cluster, which makes it possible to solve the problem of finding cluster boundaries in spatially inseparable data. The necessity of the multilayer clustering is justified in the case of uneven spatial data distribution. The method of clustering and ranking is illustrated by the example of analysis of financial statements empirical data. The technique is applicable to samples of small and medium size.
Keywords: multidimensional clustering; ranking; Kohonen neural network; cellular automaton; linear transformation; correlation matrix
Abstract: The paper describes key issues of the development of the automated multiuser testing system with a centralized data storage and a number of information security means to protect data against some external threats. The service is intended for evaluation of the knowledge and learning success at different educational stages. Different qualifying works can be created manually by lecturers. It is very useful option, primarily for the certification in higher education.
Keywords: education automation; distance learning; testing; client-server model; MySQL; Java
Abstract: The paper deals with the general principles and methods of building client .NET-applications in distributed circuit computer-aided design. It is shown that the construction of such applications requires the transfer and reception of a large number of arguments with simple and complex data types. It is noted that the organization should consider the client-server interactions in heterogeneous environments, when client and server applications are written in different languages. The paper describes the technique of converting data to a uniform manner, which ensures reliable operation of client-server interactions in heterogeneous environments. It is proposed to include the additional information software Web service method, the purpose of which is to expand the WSDL- document in which there is no information about selected when building a Web service methods converting multidimensional arrays to a unified form. The paper describes the content of the additional information of the Web service method necessary to build the client application. The paper describes the particular features of client build Windows-based applications and Web applications.
Keywords: computer-aided design; circuit design automation; client-server interaction; Web services; heterogeneous environments; distributed systems
PROBLEMS OF MAINTENANCE OF SEMANTIC GEOINTEROPERABILITY AND COORDINATION OF UNDERSTANDING OF GEODATA SEMANTICS.
Abstract: The primary goal of the work was to develop a complete and, whenever possible, all-round point of view on the problem of interoperability of cooperating information systems in general and the semantic aspect of this problem in particular. The paper considers principal causes of occurrence of the problem of intersystem interoperability, its various definitions, and approaches to its structurization. An attempt to structure the problem of interoperability is made, the ambiguous moments are discovered and possible variants of their elimination are suggested. The state-of-the-art is analyzed in the field of standardization of metadata. The conclusion about necessity of standardization of forms and ways of performance of search inquiries and intersystem functional calls is made. The basic moments of the problem of understanding of sense of the data, existing approaches to its structurization, and solving are considered.
Keywords: geodata; semantic geointeroperability; ontologies; Semantic Web
Abstract: The software-defined networking (SDN) concept, widely discussed lately, is subject to versatile consideration. Regarding the SDN, both unobviousness of several prevalent judgments and conventionality of many widely advertised advantages (e.g., deployment speed-up, operating costs reduction, and control quality improvement) are exposed. The analysis reveals such peculiarities of the SDN approach as inclination to spatial limitation, burdens of individual applied programming, desirability of introducing special trusted control channels, slowed down communication between the control and data planes, problems with ensuring reliability and availability, and objective complexities of connection with existing traditional networks. An attempt is made to explain the recent SDN concept popularity motives with commercial interests of some heavyweights on the microelectronics and networking software markets. Perspectives and conditions of the SDN concept practical implementation in the future are shown.
Keywords: network functions virtualization; network operating system; NFV; orchestration; orchestrator; RUNOS; SDN; software-defined networking
Abstract: The paper considers the purpose and characteristics of situational centers as information technology facilities that ensure the implementation of situational management. A situational center is a system. The paper indicates complicated composition and structure of information resources used to make decisions. The variety of levels of confidentiality related to the processed information is a factor of situational centers information security. Information security is performed as information protection. The paper presents an approach to building the systems of information security and protection for situational centers based on the architectural approach. Herewith, this architecture of any run organization is of a set of business architecture + IT architecture and the concept of system architecture complies with ISO/IEC 15288-2008. The paper formulates the actual problems of information security situational centers.
Keywords: situational center; situational management; informational resources; information and communication technologies; confidentiality; information security; system of information protection; architectural approach
PRINCIPLES OF CREATION OF MONITORING SYSTEM AND ANALYSIS OF WORLD STREAM OF SCIENTIFIC AND TECHNICAL INFORMATION.
Abstract: At the present stage of development of scientific and technological potential of the Russian Federation, it is necessary to improve the efficiency of research and development work. Such decisions should be based on using the objective analytical data on development trends of the world scientific and technological complex. These data can be obtained through the complex analysis of the global flow of scientific and technical information. The sources of such information may be foreign and domestic, branches and departmental portals, sites of scientific institutions, journals, scientific conferences and communities, electronic mass media, and other Internet sources of scientific and technical information. In the process of semantic analysis of multilingual heterogeneous distributed information sources, new knowledge can be obtained and the priority areas of activity of domestic and foreign research teams can be determined. The new principles for development of the system for monitoring and analysis of the global flow of scientific and technical information are proposed. These principles are based on the modern perceptions of conceptual text structure. These perceptions are based on the modern conception of phraseological conceptual analysis of texts. The methods and tools for formalization of semantic structure of the text information and adaptation methods for declarative means for the procedures of linguistic processing and semantic analysis of the text information are considered in detail. The architecture of the system and the list of functions of all its subsystems are given.
Keywords: automated text processing; semantic analysis; formal description of text; semantic structure; data extraction; linguistic software
METHODOLOGY OF RELIABILITY CALCULATION OF INTERNATIONAL THERMONUCLEAR EXPERIMENTAL REACTOR AND OPTIMIZATION OF RISK MITIGATION ACTIONS.
Abstract: The article is devoted to one of the most important issues of creation of International Thermonuclear Experimental Reactor (ITER), namely, reliability. The principles of ITER reliability analysis approach which are applicable to the ITER and its subsystems are described. The basis of the reliability increasing is so-called RAMI-analysis (RAMI stands for Reliability, Availability, Maintainability, Inspectability). This analysis covers main aspects of the issue: increasing of availability and reliability, the ability to control, to maintain, to renovate, and so on. The main steps of the RAMI-analysis (functional analysis, calculation of availability and reliability, failure mode effects and criticality analysis, and determination of a list of mitigation actions) are shown on the base of real ITER subsystems. The determination of a list of mitigation actions is closely linked with optimization of possible actions which are focused on decreasing of failure possibility and decreasing of mean time to repair the failed component. A mathematical model allowing automating the selection of the most effective and the least expensive mitigation action process which is coupled with processing of large amounts of information is proposed.
Keywords: ITER; tokamak; large system reliability analysis; mitigation actions; mathematical models of reliability optimization
Abstract: An approach to the formation of the system of procedural decisionmaking information support is suggested, which is based on the application of the fuzzy inference mechanism implemented within the neural network logical basis. Using this approach, the method allowing overcoming the semantic uncertainty in criterion concepts of a procedural law is proposed. As an example, the authors chose the Article "Violation of the author's or adjacent rights" of the Criminal Code of the Azerbaijan Republic, on the basis of which the formalism for the criterion concept "extensive damage" coupled with the applied sanction was suggested. For imposition of adequate to criterion concept sentence, the paper proposed the scale of possible sanctions obtained on the basis of the description of the correspondent legal norm in terms of fuzzy implicative rules.
Keywords: appraisal concept; legal norm; fuzzy set; multilayer neural network; fuzzy conclusion
Abstract: For nonlinear differential stochastic systems on manifolds (MStS) with Wiener and Poisson noises, the theory of synthesis of suboptimal filters based on the normal approximation method, the statistical linearization method, the orthogonal expansions method, and quasi-moment method is developed. Exact optimal (for mean square error criteria) equations for MStS with Gaussian noises in observation equations for one-dimensional a posteriori characteristic function are derived. Special attention is paid to modified filters based on unnormed distributions. Problems of approximate solving of exact equations are discussed. Accuracy and sensitivity equations are presented. A test example for nonlinear scalar differential equation with additive and multiplicative noises is given. Some generalizations are mentioned.
Keywords: a posteriori one-dimensional distribution; coefficient of orthogonal expansion; first sensitivity function; normal approximation method; normal suboptimal filter; modified NAM; modified OEM; orthogonal expansion method; orthogonal suboptimal filter; quasi-moment method; quasi-moment; statistical linearization method; stochastic system on manifolds; suboptimal filter; Wiener white noise
Abstract: Mathematical software for analytical modeling of normal stochastic processes in differential and discrete stochastic systems (StS) with complex fraction-rational nonlinearities (CFRN) is considered. Typical presentation of CFRN is given. Accuracy and sensitivity equations based on the normal approximation (NAM) and the statistical linearization methods (SLM) are given. Basic analytical and numerical methods for computing NAM (SLM) integrals are discussed. Special attention is paid to the software tool "StS-CFRN. Analysis". The Appendix contains test examples and some applications. Some generalizations are mentioned.
Keywords: analytical modeling; complex fraction-rational nonlinearities (CFRN); module "StS-CFRN. Analysis;" method of statistical linearization (MSL); normal approximation method (NAM); stochastic systems (StS)
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