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Wyszukujesz frazę "Ignatova, I." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Modeling the process of purchase payment as a constituent of information security in e-commerce
Autorzy:
Skitsko, V.
Ignatova, I.
Powiązania:
https://bibliotekanauki.pl/articles/406251.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
online store
payment card
verification
information security
queuing network
Poisson stream
Opis:
A mathematical model of the process of payment for purchases in an online store has been pre-sented. The model belongs to the class of semi-open queueing networks with four phases of exponential servers and Poisson arrivals. The authors describe in detail the derivation of the equations describing the system. Analytic expressions are derived on the basis of the proposed model for the average number of online store customers who have already paid for goods. Practical implementation of the model allows us to determine the number of clients who have added goods to their cart, but have not yet passed through the payment verification system, and thus determine the stream of real customers of the online store.
Źródło:
Operations Research and Decisions; 2016, 26, 3; 83-99
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating the reliability of the elements of cloud services
Autorzy:
Ignatova, I. V.
Biehun, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/406316.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cloud technologies
performance evaluation
Markovian queuing systems
Poisson input flow
Opis:
Cloud technologies are a very considerable area that influence IT infrastructure, network services and applications. Research has highlighted difficulties in the functioning of cloud infrastructure. For instance, if a server is subjected to malicious attacks or a force majeure causes a failure in the cloud’s service, it is required to determine the time that it takes the system to return to being fully functional after the crash. This will determine the technological and financial risks faced by the owner and end users of cloud services. Therefore, to solve the problem of determining the expected time before service is resumed after a failure, we propose to apply Markovian queuing systems, specifically a model of a multi-channel queuing system with Poisson input flow and denial-of-service (breakdown).
Źródło:
Operations Research and Decisions; 2017, 27, 3; 65-80
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High salt-solvent systems in separation of betanin and its derivatives from red beet (Beta vulgaris L.) by high-performance countercurrent chromatography (HPCCC)
Autorzy:
Spórna-Kucab, A.
Ignatova, S,
Garrard, I.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115564.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betanin
betalains
betacyanins
countercurrent chromatography
Beta vulgaris L.
Opis:
A study on a separation of betanin and its decarboxy- and dehydro-derivatives obtained from red beet roots (Beta vulgaris L.) using analytical high-performance countercurrent chromatography (HPCCC — Dynamic Extractions Ltd., UK) was performed. The HPCCC process was accomplished in the ‘tail to head’ mode with three highly polar solvent systems with high salt concentrations: 1-propanol-acetonitrile-saturated ammonium sulphate-water (v/v/v/v, 1:0.5:1.2:1); ethanol-acetonitrile-1- propanol-saturated ammonium sulphate-water (v/v/v/v/v, 0.5:0.5:0.5:1.2:1) and ethanol-1-butanol-acetonitrile-saturated ammonium sulphate-water (volume ratio), 0.5:0.5:0.5:1.2:1). HPLC analysis was performed in a conventional reversed phase mode with diode-array (DAD) detection to characterize the composition of obtained fractions. The applied solvent systems enabled the separation of the betalain pigments with high efficiency for the first time. In the mode of separation selected, the more hydrophobic compounds eluted first as expected. Moreover, for the first time, the applied HPCCC solvent systems generated a separation of 2-decarboxy-betanin from 17- and 2,17-bidecarboxy-betanin as well as from neobetanin and betanin.
Źródło:
Challenges of Modern Technology; 2012, 3, 1; 57-61
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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