In the framework of the queueing theory, a mathematical model of distributed computer system operation with buffer servicing task flow is constructed. The parameter of outgoing flow depending on time is considered. The analytical solutions of calculating mathematical expectation and dispersion of buffer load with tasks are presented.

This paper considers the issues of fault-tolerant operation of geographically distributed computer systems (GDCS) in multitask modes. The model of GDCS operation consisting of many subsystems was proposed. Algorithms of fault-tolerant distributed job queue operation were developed. Algorithms of resource management for the GDCS subsystems were created. The program tools of fault-tolerant execution of parallel programs on GDCS subsystems were developed and implemented. Simulation results of the algorithms on the multicluster GDCS (GRID model) were presented.

The method of universal coding for sets of sources, consisting of the union of a countable number of sets is proposed. It is shown that the proposed encoding of Markov’s sources combination with finite memory is asymptotically optimal. Furthermore, it was found that the proposed coding is weakly universal for stationary sources.

The approach to investigating control algorithms in terms of their applicability for computing systems of the future generation is presented in this paper. Multi-agent models of control algorithms have being created for the purpose that are oriented to simulation of computer systems with millions cores. Analysis of efficiency of modeled algorithms is being done, and recommendations about their modification are proposed.

This paper is a survey of some results and open problems about the structure of (mostly infinite) periodic groups with a given set of element orders.

This paper considers methods of spatial spectrum analysis of signals and interference in the formation of signals quantity and interference analysis algorithms and direction of their arrival to digital array. Comparative assessment of the resolution quality by different methods in accordance with maximum criteria of signal/(interference + noise) ratio is presented.

This article covers some key approaches to problem solving of reducing inter-cell interference in mobile LTE networks, caused by lack of frequency reuse. On the basis of the authors' simulation model, a comparative analysis of the existing solutions in terms of attainable bandwidth and the probability of blocking traffic channels PUSCH and PDSCH was implemented. Simulation results demonstrate the inefficient use of time division of resources at the edges of cells between subscribers served by different stations as part of any inter-cell interference coordination procedures.

The problem of effective exhaustive algorithm paralleling used for calculation of some network reliability characteristics with unreliable links or/and nodes and for combinatorial optimization of such networks is examined. General approaches and specific algorithms enabling effective usage of computational resources when solving tasks of the classes under consideration are presented.

In this paper, we present a research of optimal networking method of digital terrestrial television broadcasting standard DVB-T2 based on an idealized homogeneous network using software based on mathematical optimization algorithms. In 2006, a session of the Regional Radiocommunication Conference of the International Telecommunication Union (ITU) on planning digital terrestrial broadcasting service in parts of Regions 1 and 3 (including Russia) within the bands 174 - 230 MHz and 470 - 862 MHz (RRC-06) [1] took place. Following the session’s guidelines, ITU carried out a comprehensive research of the optimal networking method of terrestrial digital TV broadcasting based on the standard (homogeneous) network as an example in Novosibirsk region by introducing network efficiency index characterizing the cost of digital terrestrial television broadcasting maintenance of 1-2 km covered by Novosibirsk region.

The technology of Code Division Multiple Access (CDMA) is based on parallel transfer of mutually orthogonal broadband signals that use total available time and frequency band of wireless medium. The errors of inaccurate fulfillment of conditions of mutual signals orthogonality inevitably generate the intra-cell and inter-cell interference noise that define available value of ratio Signal-to-Interference & Noise Ratio (SINR). The SINR value, in turn, limits the maximal number of parallel active code division channels, i.e., the capacity of cellular cell. Usually, SINR values are calculated indirectly through the ratios of energy parameters of broadband signals. However, the indirect approach does not allow considering dependence of the interference versus orthogonality conditions errors. In this paper, the advanced calculation method of the CDMA networks’ capacity is offered, which allows considering the dependences “SINR versus not strict orthogonality errors” directly through the orthogonal signals correlation functions. It is showed, that it is possible raise many times the networks CDMA capacity by reduction of the signals’ orthogonality errors.

During full-scale tests, the effect of structurally similar interference of adjacent channels of Wi-Fi communication equipment on the actual data transfer rate in small-sized wireless network was analyzed. The dependence of the received signal level and the communica-tion range of the artificial noise conditions are defined. Built according to the test results, graphic dependences show that the actual radius of the coverage area of the access point is only 23 meters that is substantially less than it was claimed by the branded equipment manufacturer.

The paper discusses the principles of basic ontology of nonspecific entities BONE, some features of its specification and use of this ontology while creating databases and information systems. A distinctive feature of the presented ontology is the systematic use of so-called constituent relations. It allows you to define attributes not only for objects, but also for relationships between them. Ontology BONE is intended for information structuring within the bounds of the approaches and technologies of Semantic Web.