Výsledky vyhledávání - "Ivan Kovalev"

Akademický článek

Ergodicity and Related Bounds for One Particular Class of Markovian Time—Varying Queues with Heterogeneous Servers and Customer’s Impatience

Autor: Yacov Satin, Rostislav Razumchik, Ivan Kovalev, Alexander Zeifman

Publikováno v: Mathematics, Vol 11, Iss 9, p 1979 (2023)

We consider a non-standard class of Markovian time: varying infinite capacity queues with possibly heterogeneous servers and impatience. We assume that during service time, a customer may switch to the faster server (with no delay), when such a serve

Externí odkaz: https://doaj.org/article/fad3bff70cc6497cb25601bef20bdb33

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Akademický článek

Convergence Bounds for Limited Processor Sharing Queue with Impatience for Analyzing Non-Stationary File Transfer in Wireless Network

Autor: Irina Kochetkova, Yacov Satin, Ivan Kovalev, Elena Makeeva, Alexander Chursin, Alexander Zeifman

Publikováno v: Mathematics, Vol 10, Iss 1, p 30 (2021)

The data transmission in wireless networks is usually analyzed under the assumption of non-stationary rates. Nevertheless, they strictly depend on the time of day, that is, the intensity of arrival and daily workload profiles confirm this fact. In th

Externí odkaz: https://doaj.org/article/58a746517e5a42e5b831566d3bbffe93

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Akademický článek

Ta/Ti/Ni/Ceramic Multilayered Composites by Combustion Synthesis: Microstructure and Mechanical Properties

Autor: Olga Kamynina, Sergey Vadchenko, Natalia Shkodich, Ivan Kovalev

Publikováno v: Metals, Vol 12, Iss 1, p 38 (2021)

Ta/Ti/Ni/ceramic multilayered composites were successfully prepared by combustion synthesis. Laminated composites Ti–Ta–(Ti + 0.65C)–Ni–(Ti + 1.7B)–(Ti + 1.7B)–Ta–Ni-Ti and 3(Ti + 1.7B)–Ta–(5Ti + 3Si)–Ta–(Ti + 1.7B)–Ta–(5Ti

Externí odkaz: https://doaj.org/article/01cef9f46c264d1697f34f46a792967a

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Akademický článek

Facilitating Numerical Solutions of Inhomogeneous Continuous Time Markov Chains Using Ergodicity Bounds Obtained with Logarithmic Norm Method

Autor: Alexander Zeifman, Yacov Satin, Ivan Kovalev, Rostislav Razumchik, Victor Korolev

Publikováno v: Mathematics, Vol 9, Iss 1, p 42 (2020)

The problem considered is the computation of the (limiting) time-dependent performance characteristics of one-dimensional continuous-time Markov chains with discrete state space and time varying intensities. Numerical solution techniques can benefit

Externí odkaz: https://doaj.org/article/8953154d45544fb8923fb18ed69bb1b3

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Akademický článek

The Social Environment and Business Communication in English: A Small-Scale Research on Front-Line Staff Performance in Russia, Spain and France

Autor: Maria Rubtsova, Elena Kapustkina, Ruben Karapetyan, Ivan Kovalev, Sergey Rasskazov

Publikováno v: International Review of Management and Marketing, Vol 5, Iss 4, Pp 253-258 (2015)

The performance measuring of the English everyday use of the front-line personnel remains an important topic of theoretical and practical study. Using a method of participant observation, the authors compared the St. Petersburg business environment w

Externí odkaz: https://doaj.org/article/ad5cff61f7304d07ae09938e72fee69c

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Akademický článek

n-Alkane Distribution—A Paleovegetation Change Indicator during the Period from Late Glacial to Late Holocene on Russian Plain (Bryansk Region)

Autor: Ekaterina Stolpnikova, Natalia Kovaleva, Ivan Kovalev

Publikováno v: Geosciences, Vol 10, Iss 3, p 86 (2020)

Loess-paleosol series are well preserved in the south part of the Russian Plain. However, these sequences have a low number of studies on their organic matter, such as researches of isotope composition, n-alkane and other biomarkers. Thus, the purpos

Externí odkaz: https://doaj.org/article/2fd1a49c1fd845428aaf8a62a7948198

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