Dmitry Kozyrev

Dmitry Kozyrev
Peoples' Friendship University of Russia (RUDN University) · Department of Applied Informatics and Probability Theory

PhD

About

57
Publications
7,293
Reads
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232
Citations
Additional affiliations
June 2014 - February 2016
Peoples' Friendship University of Russia (RUDN University)
Position
  • Professor (Associate)
September 2007 - June 2014
Peoples' Friendship University of Russia
Position
  • Professor (Associate)

Publications

Publications (57)
Article
Full-text available
The model discussed in this paper provides an efficient mechanism for the selection and allocation of available limited spectra for transmission of heterogeneous data in a network. The data packets (customers), belonging to different classes, arrive according to a batch marked the Markovian arrival process (BMMAP). The inventory considered is of mu...
Article
Full-text available
We consider a queueing inventory with one essential and m optional items for sale. The system evolves in environments that change randomly. There are n environments that appear in a random fashion governed by a Marked Markovian Environment change process. Customers demand the main item plus none, one, or more of the optional items, but were restric...
Chapter
We consider the mathematical model of a closed homogenous redundant hot-standby system. This system consists of an arbitrary number of data links with an exponential distribution function (DF) of uptime and a general independent (GI) distribution function of the repair time of its elements with a single repair unit. We also consider the simulation...
Chapter
We consider the problem of ensuring the durability indicators of a distributed communication automatic weather stations network (AWSN), consisting of access points and weather stations (WS), remote from each other at distances of up to several tens of kilometers and connected to the nearest access points and to each other by communication channels....
Article
Full-text available
In the actual study, we carried out a reliability analysis of a repairable redundant data transmission system with the use of the elaborated mathematical and simulation model of a closed heterogeneous cold standby system. The system consists of one repair unit and two different data sources with an exponential cumulative distribution function (CDF)...
Conference Paper
Full-text available
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 p...
Article
Full-text available
This paper aimed to demonstrate the capabilities of decomposable semi-regenerative processes for the investigation of the k-out-of-n system. Proposed in 1955 by W. Smith, the regeneration idea has come a long way in terms of development and has found widespread applications. First, we briefly recall the history of the development of the regeneratio...
Article
Full-text available
A single-server queuing-inventory system in which arrivals are governed by a batch Markovian arrival process and successive arrival batch sizes form a finite first-order Markov chain is considered in this paper. Service is provided in batches according to a batch Markovian service process, with consecutive service batch sizes forming a finite first...
Chapter
Full-text available
The problem of sensitivity of a redundant system’s probability characteristics to shapes of the input distributions is considered. In some previous works, closed-form representations have been obtained for stationary characteristics of hot-standby redundant systems with exponential lifetime distribution of their elements and general distribution of...
Chapter
With the rapid development and spread of computer networks and information technologies, researchers are faced with new complex challenges of both applied and theoretical nature in investigating the reliability and availability of communication networks and data transmission systems. In the current paper, we perform the system-level reliability ana...
Book
Highlighting the latest advances in stochastic analysis and its applications, this volume collects carefully selected and peer-reviewed papers from the 5th International Conference on Stochastic Methods (ICSM-5), held in Moscow, Russia, November 23-27, 2020. The contributions deal with diverse topics such as stochastic analysis, stochastic methods...
Book
This book constitutes the refereed post-conference proceedings of the 24th International Conference on Distributed and Computer and Communication Networks, DCCN 2021, held in Moscow, Russia, in September 2021. The 26 revised full papers and 3 revised short papers were carefully reviewed and selected from 151 submissions. The papers cover the follow...
Article
Full-text available
In the current work, we perform reliability analysis of a repairable data transmission system with the use of the elaborated mathematical model of a closed heterogeneous redundant cold standby system. The system consists of a single repair unit with two different data sources with an exponential distribution function (DF) of uptime and a general in...
Article
Full-text available
Резервирование является одним из основных способов повышения надежности сложных технических систем и широко применяется не только в наземных системах передачи данных, но и в телекоммуникационных беспроводных сетях на базе высотных привязных мультироторных платформ. В работе рассматривается математическая модель восстанавливаемой резервированной сис...
Article
Full-text available
В данной работе мы рассматриваем математическую модель восстанавливаемой резервированной системы передачи данных как модель замкнутой неоднородной системы холодного дублирования с одним ремонтным устройством, с произвольным числом источников данных с экспоненциальной функцией распределения времени безотказной работы и произвольной функцией распреде...
Article
Full-text available
The reliability study of k-out-of-n systems is of interest both from theoretical and practical points of view. Applications of such models can be seen in many real-world phenomena, including telecommunication, transmission, transportation, manufacturing, and services. A probabilistic study of a real-world k-out-of-n system often helps to develop an...
Chapter
In the light of the proliferation of the Internet of Things (IoT), the device-to-device (D2D) communication is becoming a promising technology and a key enabler for enhancing the energy efficiency of the wireless network environment and reducing the traffic latency between user equipments (UEs) within their communication range. This papers consider...
Chapter
We consider a topology of a distributed communication network of weather stations and its hardware configuration. The operability criteria for the considered network are formulated. The theoretical foundations for optimizing the acquisition of spare parts, tools and accessories (SPTA) for distributed systems are considered. An algorithm for SPTA op...
Book
This book constitutes the refereed proceedings of the 23rd International Conference on Distributed and Computer and Communication Networks, DCCN 2020, held in Moscow, Russia, in September 2020. Due to the COVID-19 pandemic the conference was held online. The 43 papers were carefully reviewed and selected from 167 submissions.The papers are organiz...
Conference Paper
Full-text available
С быстрым развитием и распространением компьютерных сетей и информационных технологий, перед исследователями возникают новые сложные и комплексные задачи как прикладного, так и теоретического характера по исследованию надежности и доступности сетей и систем передачи данных. Одной из них является исследование надежности резервированных систем переда...
Chapter
This article discusses a model on the basis of a multidimensional Markov process applied for evaluation of the reliability characteristics of a tethered multirotor high-altitude platform based on a hexacopter. The proposed model takes into account the increase in the functional load after the failure of an element on the remaining operating ones, a...
Chapter
Distributed automatic weather stations networks (AWSN) play an important role in modern weather forecasting and digitalization of agriculture. These networks allow to monitor various environment parameters and transmit actual data in real time to data centers, which makes possible to dramatically increase the efficiency of technical processes contr...
Chapter
Full-text available
We consider a mathematical model of a repairable data transmission system as a model of a closed homogeneous system \(\langle M_2/GI/1 \rangle \) of two elements in a warm-standby with an exponential distribution function of the time to failure, and with an arbitrary distribution function of the repair time of its elements with one restoring elemen...
Conference Paper
A redundant data transmission system with linear topology is studied using reliability modeling of a heterogeneous hot standby system with one repair unit and exponential repair time of its failed elements (data transmission channels). Two cases are considered — a special one, when the lifetime distribution of the elements is exponential, and a gen...
Book
This book constitutes the refereed proceedings of the 22nd International Conference on Distributed and Computer and Communication Networks, DCCN 2019, held in Moscow, Russia, in September 2019. The 44 full papers and 2 short papers were carefully reviewed and selected from 174 submissions. The papers cover the following topics: Computer and Communi...
Book
This book constitutes the refereed proceedings of the 22nd International Conference on Distributed and Computer and Communication Networks, DCCN 2019, held in Moscow, Russia, in September 2019. The 50 full papers and 2 short papers were carefully reviewed and selected from 174 submissions. The papers cover the following topics: Computer and Communi...
Conference Paper
Full-text available
R. Сравнение численных и графических результатов, полученных с использованием как аналитических, так и имитационных подходов, показала, что они имеют близкое соответствие, поэтому предложенная имитационная модель может использоваться в случаях, когда аналитическое решение в явном виде не может быть получено или как часть более сложной имитационной...
Conference Paper
Full-text available
In this paper we study a M AP/M/2 queueing system with heterogeneous servers. The system operates in a Markovian random environment which modulated service rates of faster server. The allocation of customers between the servers proceeds according to a heuristic FFS-policy (Fastes Free Server) and to an optimal policy which minimizes the average num...
Chapter
Full-text available
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...
Article
Full-text available
Today, the number of interconnected Internet of Things (IoT) devices is growing tremendously followed by an increase in the density of cellular base stations. This trend has an adverse effect on the power efficiency of communication, since each new infrastructure node requires a significant amount of energy. Numerous enablers are already in place t...
Conference Paper
Full-text available
Рассматривается модель < M_2/GI/1 > системы облегчённого резервирования с экспоненциальной функцией распределения (ФР) времени безотказной работы (в.б.р.) и произвольной ФР времени ремонта её элементов. Получены явные аналитические выражения для стационарного распределения вероятностей состояний системы и для стационарной вероятности отказа системы...
Article
Full-text available
Motivated by the unprecedented penetration of mobile communications technology, this work carefully brings into perspective the challenges related to heterogeneous communications and offloaded computation operating in cases of fault-tolerant computation, computing, and caching. We specifically focus on the emerging augmented reality applications th...
Conference Paper
Full-text available
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-dimensio...
Book
This book constitutes the refereed proceedings of the 20th International Conference on Distributed and Computer and Communication Networks, DCCN 2017, held in Moscow, Russia, in September 2017. The 39 full papers and the two short papers were carefully reviewed and selected from 176 submissions. The papers cover the following topics: computer and...
Article
Annotation. We consider the problem of sensitivity analysis of reliability characteristics of a repairable cold standby data transmission system to shapes of the input distributions. Discrete-event simulation model is introduced to obtain results in case of a general (non-exponential) distribution of repair time of the elements.
Conference Paper
Full-text available
Рассматривается система <M_2/GI/1> холодного резервирования с экспоненциальной функцией распределения (ФР) времени безотказной работы (в.б.р.) и произвольной ФР времени ремонта её элементов. Получены явные аналитические выражения для стационарного распределения вероятностей состояний системы и для стационарного в.б.р. системы. Проведено имитационно...
Article
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 F...
Conference Paper
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 sm...
Conference Paper
We consider the problem of reliability assurance of a local ground-based distributed radio direction finding system (RDFS), which consists of a local dispatching center (LDC) and unattended radio terminals (URT), which are up to several hundred kilometers apart from the LDC and are connected to the LDC via communication channels. The performance cr...
Book
This book constitutes the refereed proceedings of the 19th International Conference on Distributed and Computer and Communication Networks, DCCN 2016, held in Moscow, Russia, in November 2016. The 50 revised full papers and the 6 revised short papers presented were carefully reviewed and selected from 141 submissions. The papers cover the followin...
Conference Paper
Full-text available
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.
Conference Paper
Full-text available
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 queue-ing systems with correlated MAP input flows and a cross-traffic. The results of analytical calculations for the networks of s...
Article
Full-text available
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 F...
Conference Paper
Full-text available
We consider a two-channel queuing system with unreliable servers which fail alternately for modeling of hybrid communication systems, which have a millimeter-wave (71-76 GHz, 81-86 GHz) radio channel as a backup communication channel. The stationary distribution of the system states and the most important performance characteristics were obtained.
Conference Paper
Full-text available
Рассматривается задача оптимального выполнения (потока) задач при возможности их прерывания.
Article
Full-text available
Broadband wireless data transmission network for providing of automobile transport system safety is considered. The network operates under IEEE802.11n-2012 protocol that guarantees high-speed transmission of multimedia information between automatic stationary and mobile systems of traffic control. The model of stochastic network with dependent serv...
Conference Paper
Full-text available
A reliability model of homogeneous multi-redundant repairable hot standby systems with PH distribution restoration is developed. Stationary and non-stationary reliability properties of such systems are worked out.
Chapter
Full-text available
For modeling and analysis of the reliability of complex hierarchical partially controllable systems the methods of decomposable semi-regenerative processes are used. A simple example illustrates our approach. Keywords and phrasesReliability of hierarchical systems-Decomposable semiregenerative processes
Article
Full-text available
Most of real technical systems and biological objects with sufficiently high organization are complex hierarchical partially controllable systems. In the paper for modeling and analysis of reliability of such systems the method of decomposable semi-regenerative processes is used. A simple example illustrates our approach.

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Project (1)
Project
Development of a theoretical framework and methods of design and implementation of next-generation broadband wireless networks for transmitting of multimedia information along extended transport routes, that should enhance the quality of management and operational control of technical parameters of transport routes, as well as their safety control with the use of information from video surveillance systems and provide the voice communication (IP telephony) between the stationary and mobile objects along highways. Creation and testing of the network prototype based on wireless routers that function under control of the IEEE 802.11n international protocol standard and antenna devices that implement the MIMO technology.