Papers by Dmitry V . Kozyrev
Communications in computer and information science, 2024
Mathematics
In this paper, we analyse a queueing system with two servers where the arrival and service proces... more In this paper, we analyse a queueing system with two servers where the arrival and service processes are interdependent. The evolution of these processes is governed by transitions on the product space of three Markov chains, which are descriptors of the arrival and service processes. The transitions in this Markov chain follow a semi-Markov rule and the exponential distribution governs the sojourn times in the states. The stability condition of the system is derived and the stationary distribution is calculated for the system in equilibrium. Several important performance measures are provided, and numerical illustrations of the model are presented.
2022 International Conference on Information, Control, and Communication Technologies (ICCT), Oct 3, 2022
Discrete and continuous models and applied computational science, Sep 15, 2011
Кафедра теории вероятностей и математической статистики Российский университет дружбы народов ул.... more Кафедра теории вероятностей и математической статистики Российский университет дружбы народов ул. Миклухо-Маклая, 6 , Москва, 117198, Россия В работе исследуется скорость сходимости распределения времени безотказной работы дублированной системы облегченного резервирования к показательному закону при "быстром" восстановлении ее элементов. В качестве частных случаев приводятся результаты для системы с нагруженным и ненагруженным резервированием. Ключевые слова: надежность систем, предельные теоремы, быстрое восстановление.
DOAJ (DOAJ: Directory of Open Access Journals), Sep 1, 2020
Mathematics, Nov 13, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Communications in computer and information science, 2016
This paper presents the description of the method of performance evaluation and assessment of mai... more This paper presents the description of the method of performance evaluation and assessment of main characteristics of broadband wireless networks with linear topology, which is based on a model of stochastic multiphase queueing systems with correlated MAP input flows and a cross-traffic. The results of analytical calculations for the networks of small dimension are given. A simulation model for assessment of performance characteristics of large-scale wireless networks with linear topology is developed.
Springer proceedings in mathematics & statistics, 2018
The problem of sensitivity of a redundant system’s reliability characteristics to shapes of their... more The problem of sensitivity of a redundant system’s reliability characteristics to shapes of their input distributions is considered. In Efrosinin and Rykov, Information Technologies and Mathematical Modelling, 2014, [1] an analytical form for dependence of a two-unit cold standby redundant system reliability characteristics on life and repair time input distributions was obtained and investigated for the case of exponential distribution of one of the time lengths. In the current chapter this study is extended with the help of simulation method to a general case of both non-exponential distributions. Comparison of analytic and simulation results was carried out.
Lecture Notes in Computer Science, 2022
In different spheres of human activity one needs to make decisions, connected with different risk... more In different spheres of human activity one needs to make decisions, connected with different risks, under condition of uncertainty. However, the very concept of uncertainty and risk needs clarification. The article discusses various interpretations of the term “uncertainty” and the formation of the term “risk” as a scientific concept. The authors prefer to limit themselves to the random-type uncertainty and propose to investigate risk and its management within the framework of this interpretation. As a tool for the problem solution construction and analysis of a risk tree is proposed. The proposed approach is demonstrated with the help of a real-world example.
This article presents a method of the automated control of distributed radio direction finding sy... more This article presents a method of the automated control of distributed radio direction finding system (RDFS) providing the construction of an automated system of technical diagnostics and recovery of distributed RDFS performance on the specified requirements. This dual-circuit method includes diagnosing and reliability operations, redundancy recommendations, and also control algorithms of the constituent elements of the system. The structure and mathematical apparatus of the operations, recommendations, and algorithms of the proposed method are shown. The basic requirements and restrictions under which the construction of automated technical diagnosis system is carried out are specified.
Indian Journal of Pure and Applied Mathematics, Jun 1, 2016
Creation of a modern infrastructure for multimedia data (voice, data, video) transmission along t... more Creation of a modern infrastructure for multimedia data (voice, data, video) transmission along the long transport routes is one of the most important problems while designing and building up the new highways and exploiting the existing ones. The solution of this problem is especially relevant for countries with a vast territory, like the Russian Federation. Creation of such communication infrastructure allows to provide (i) the operating control over the technical parameters of a route by the means of high-speed data transfer from sensors and data units to the control center (ii) the security control over the route sections and strategically important objects using data from the video surveillance systems and (iii) the voice communication (IP-telephony) and transmission of multimedia information between the stationary and mobile objects on long highways as well as communication with the control center etc.
Lecture Notes in Computer Science, 2018
The article presents the results of the analysis of the need for unification of tethered telecomm... more The article presents the results of the analysis of the need for unification of tethered telecommunication high-altitude platforms (HAP). Possible ways of unification and standardization of HAP, as well as criteria and methods of their structural optimization are considered. It is shown that one of the methods for increasing the efficiency of telecommunication networks is the unification of requirements, component parts and their composite systems. The requirements that should be laid at the stage of setting a technical task for product development are given and it is shown that such parameters as the repeatability factor, the applicability factor, the inter-project unification coefficient are used to assess the level of unification. It is shown that to solve the problems of hardware-software unification and ensure information compatibility, it is necessary to develop appropriate models that take into account the specifics of modern information transmission systems in HAP. The rationale for using the apparatus of logical-dynamic models for solving unification problems is proved, and their joint use with network models allows to formalize the information necessary for solving the problems of hardware-software unification of HAP and ensuring their information compatibility.
2020 International Conference Engineering and Telecommunication (En&T)
One of the promising directions in the framework of the concept of creating the next-generation 5... more One of the promising directions in the framework of the concept of creating the next-generation 5G/IMT-2020 networks is the development of broadband wireless networks based on autonomous unmanned aerial vehicles (UAVs). In addition to the interest in autonomous UAV-based high-altitude platforms (HAPs), leading researchers are currently engaged in the design and implementation of tethered unmanned HAPs, which are intended to be long-term operating and are widely used in civilian and military areas. Their possibility of long-term operation, which is one of the main advantages over autonomous UAVs, puts forward new reliability requirements. In this paper we study an analytical reliability model of the multi rotor flight module of the tethered HAP as a homogeneous hot-standby system consisting of $n$ elements operating in a random environment. A general Markov reliability model of the considered system operating in a random environment is proposed, which accounts for the increase in the functional load and the location of the failed components.
2015 Advances in Wireless and Optical Communications (RTUWO), 2015
A novel iterative algorithm for designing the architecture of broadband wireless networks along t... more A novel iterative algorithm for designing the architecture of broadband wireless networks along the long highways is considered. The mathematical problems were formulated and solved for every step of the iterative method. An example is given of designing a broadband wireless network along the highways in one of the regions of Russia.
In this note we obtain reliability function of two-component system under the Marshall-Olkin fail... more In this note we obtain reliability function of two-component system under the Marshall-Olkin failure model in terms of Laplace transform. The problem of its sensitivity to the shape of the system components repair times is investigated as well.
We consider a distributed Radio Direction Finding System (RDFS) and the structure of its hardware... more We consider a distributed Radio Direction Finding System (RDFS) and the structure of its hardware. A classical diagnostic model of the distributed RDFS according to the binary criterion is presented, which includes diagnostic graphs and a set of tests. We propose a theoretical basis for diagnosing of the distributed RDFS according to the n-dimensional criterion. An example of implementation of the diagnostic approach to the distributed RDFS for states “failure”, “deterioration”, “normal” is presented.
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Papers by Dmitry V . Kozyrev