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Kiev, Ukraine
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Adamenko V.A.,NTUU KPI | Mirskikh G.A.,NTUU KPI
CriMiCo 2012 - 2012 22nd International Crimean Conference Microwave and Telecommunication Technology, Conference Proceedings | Year: 2012

The advantages of neural networks application for the development of microwave devices are considered. Expedience of problems solution related to the approximation peculiarities of the microwave devices characteristics using neural networks ensemble is validated. Ensemble architecture for characteristics approximation is proposed. © 2012 CriMiCo.

Meshaninov S.K.,DSTU | Spivak V.M.,NTUU KPI
Modern Problems of Radio Engineering, Telecommunications and Computer Science, Proceedings of the 13th International Conference on TCSET 2016 | Year: 2016

There are presented results of analytical researches of reliability and efficiency of the using of apparatus for biophysical researches as a difficult technical system. Considered the classification factors, qualificatory efficiency of functioning of apparatus for biophysical researches. Create the conclusion that the combined service is optimal, here as an evaluation criterion the criterion of a minimum of risk is chosen. © 2016 National University Lviv Polytechnic.

Trubina S.,NTUU KPI
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 10th International Conference, TCSET'2010 | Year: 2010

The article presents possible ways of achievieng international coordination for the Ukrainian satellite "Lybid".

Demchenko Y.,NTUU KPI
2014 IEEE 34th International Scientific Conference on Electronics and Nanotechnology, ELNANO 2014 - Conference Proceedings | Year: 2014

In this paper the energy performance comparison of active high-frequency power factor correctors for three control methods (borderline control, peak current control and average current control) is made. In MATLAB/Simulink environment models corresponding to each method of control were developed. Functional circuit diagrams, throttle current charts and load voltage charts of each corrector are given. Power factor correctors energy performance under the nominal load condition, under reduced and increased load resistance was researched. © 2014 IEEE.

Manulyk A.,Owens-Illinois | Mykhalenkov K.,NTUU KPI
Materials Science and Technology Conference and Exhibition 2013, MS and T 2013 | Year: 2014

The erosion, corrosion, and oxidation-resistance properties of TiAlSiCN and TiCrSiCN coatings depend directly on the microstructure and uniformity of composition in the coating body. Where the Key material parameters that influence the emergence of a protective silica oxygen diffusion barrier in these materials under high temperature, oxidizing conditions include: the composition, crystallographic structure, size, size distribution, and spatial uniformity of discrete phases distributed throughout the resulting cermet. There is a difference in TiAlSiCN and TiCrSiCN microstructure. TiCrSiCN contains a higher ceramic - to-metallic phase ratio: i.e. it is more "ceramic" by nature. Based on preliminary characterization of the scale layers in these two series of materials, we believe that here are two possible mechanisms for oxide scale formation high temperature: (1) simultaneous emergence of competing stable oxides, including silica, with silica rapidly forming the dominant, continuous protective phase over time and (2) the initial nucleation and growth of network of stable and complex local oxide phases across the exposed cermet surface, each of which reduces the rate of oxygen diffusion in varying degrees over the material and upon eventual impingement react or thermally mix with one another to form final complex scale layer. Copyright © 2013 MS&T'13®.

Mudriievskyi S.,TU Dresden | Tsokalo I.,NTUU KPI | Haidine A.,KEMA Consulting GmbH | Adebisi B.,Lancaster University | Lehnert R.,TU Dresden
2011 IEEE International Conference on Smart Grid Communications, SmartGridComm 2011 | Year: 2011

This paper investigates the backoff algorithm for Narrowband Power Line Communications (PLC) Medium Access Control (MAC) protocol. Specifically, the paper considered the MAC designed by Yitran and implemented within its Differential Code Shift Keying (DCSK) technology. In this algorithm width of the contention window is calculated based on the estimated number of active nodes in the network. Further the performance of the algorithms were evaluated under different saturated throughput conditions and varying number of active nodes, in a fully meshed network. Comparison were also made between the simulated and the polynomial backoff algorithm's dynamic characteristics. Simulation results show that the algorithm under investigation has an excellent performance under the saturated throughput, although its dynamic characteristic can be further improved. © 2011 IEEE.

Maksymiuk Ie.,NTUU KPI
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 11th International Conference, TCSET'2012 | Year: 2012

Paper presents tool for service-oriented applications design, which will improve the overall efficiency and reduce the time for development and adaptation of such applications in constantly changing environment. © 2012 Lviv Polytechnic Natl Univ.

Telpiakova A.,NTUU KPI
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 11th International Conference, TCSET'2012 | Year: 2012

This paper provides the reasoning and technical solutions for development of thermal simulator of human - the device for measuring the thermo physical characteristics of materials and thermosurgical equipment. © 2012 Lviv Polytechnic Natl Univ.

Portier R.A.,École Nationale Supérieure de Chimie de Paris | Ochin P.,French National Center for Scientific Research | Pasko A.,French National Center for Scientific Research | Monastyrsky G.E.,NTUU KPI | And 3 more authors.
Journal of Alloys and Compounds | Year: 2013

Cu-Al-Ni-based shape memory material was elaborated by spark plasma sintering method from the micron and submicron sized particles prepared by spark-erosion method in liquid argon from preliminary melted master alloy with the composition of Cu-13.01Al-3.91Ni-0.37Ti-0.24Cr wt%. The effects of processing parameters, mainly temperature of sintering and sintering time on the martensitic transformation and microstructure of the sintered compacts were investigated. Both martensitic phases (18R and 2H) available for Cu-Al-Ni alloy of such composition as well as γ and α phases were found in sintered samples. Their amounts depend on the temperature of sintering and seem to be strongly affecting the Ms point. Although the powder has already sintered at 390 C the best quality of samples were found for samples sintered at 650-700 C. © 2012 Elsevier B.V.

Ilchenco M.Ye.,NTUU KPI | Kalinin V.I.,Russian Academy of Sciences | Narytnik T.N.,IEC of ASU UANSP | Cherepenin V.A.,Russian Academy of Sciences
CriMiCo 2011 - 2011 21st International Crimean Conference: Microwave and Telecommunication Technology, Conference Proceedings | Year: 2011

UWB ecologically friendly communication link at 70 nanowatt transmit power is proposed for wireless personal area networks. The electromagnetic compatibility and transmit covertness performances are presented. © 2011 CRIMICO (Crimean Microwave Conference).

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