Сучасні проблеми радіоелектроніки, телекомунікацій, комп'ютерної інженерії
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Item 3-D-display(Видавництво Львівської політехніки, 2010) Omeltshenko, SvitlanaIn this paper are given a brief description of the work and the basic advantages and disadvantages of 3- D-displays.Item 3GPP Long Term Evolution (LTE)(Видавництво Львівської політехніки, 2010) Pospishny, Igor; Vasyuk, Volodymyr; Romanchyk, Sergiy; Dovzhenko, Olexander; Dony, Olexander; Shvaichenko, VolodymyrIn these theses in common considered objectives of development of the LTE standard and also the advantages of application of this technology, meeting requirements of subscribers and operators of services. The article describe OFDM technology and possibilities of 3GPP standard.Item 4G interactive heterogeneous telecommunication system (IHTS)(Видавництво Львівської політехніки, 2010) Burtovyi, Sergii; Sunduchkov, K. S.In this paper the possible variant of IHTS topology is given.Item A 2D and 3D electrical impedance tomography imaging using experimental data(Видавництво Львівської політехніки, 2012) Shulga, DmitryIn this paper model, method and results of 2D and 3D conductivity distribution imaging using experimental data are described. The 16-electrodes prototype of computer tomography system, special Matlab and Java software were used to perform imaging procedure. The developed system can be used for experimental conductivity distribution imaging and further research work.Item A calculation of radio electronic devices own noises in the range of low frequencies(Видавництво Львівської політехніки, 2010) Kolodiy, Zenoviy; Nedostup, Leonid; Kolodiy, AndriyFormula for calculation of own noises level of radio electronic devices in the range of low frequencies.Item A device for detection of bacterial cells(Видавництво Львівської політехніки, 2012) Bilyj, Oleksandr; Yaremyk, Roman; Ferensovich, Yaroslav; Getman, Vasyl'; Grechukh, Taras; Kotsyumbas, Ihor; Kushnir, IhorA device for detection of bacterial cells and results of researches bacterial cells of Escherichia coli and Desulfuromonas of acetoxidans is described.Item A dynamic model of a TCP-session at the management by a length of queue with the use of RED mechanism(Видавництво Львівської політехніки, 2010) Starkova, O. V.a mathematical model of TCP-session of data communication at the management by a length of queue with the use of congestion avoidance mechanism – RED (Random Early Detection) – is proposed. This model is expressed by differential equations, which represent the dynamic of information exchange between hosts.Item A flow-based model of two-level routing in multiservice network(Видавництво Львівської політехніки, 2010) Lemeshko, Olexandr; Hailan, Ahmad M.; Ali, Ali S.In this paper an approach to the flow-based modeling of two-level routing in multiservice networks is considered. The model supports the source routing. At the low level – the level of edge routers – the routes are directly computed, and at the top level the received decisions are coordinated for excluding overloads of communication channels in a multiservice network.Item A modified method for estimating software projects labor costs(Видавництво Львівської політехніки, 2012) Bragina, Tetyana; Tabunshchyk, GalynaIn the article labor coefficients assessment methods were analyzed and the correction factor that takes into account the software development model, in order to reduce the risk of internal scheduling violations was suggested by the authors.Item A multi-criteria method of compressed video sequences comparison(Видавництво Львівської політехніки, 2010) Pietkiewicz, TadeuszA multi-criteria method is presented for comparison of compressed video images. As criteria are used: bit rate of video stream, subjective quality evaluation of compressed video sequence and objective quality evaluation of compressed video sequence using Average Peak Signal-to-Noise Ratio (APSNR) metric.Item A multiple access technique for differential noise shift keying system(Видавництво Львівської політехніки, 2012) Sytnyk, AntonIn this paper briefly described a multiple access technique for differential noise shift keying (DNSK) system.Item A possible approach to increasing of the telecommunication network’s capacity(Видавництво Львівської політехніки, 2012) Grynkov, YuriIn this work an approach to increase of the telecommunication network’s capacity by constructing all-optical fragments of data networks is offered.Item A problem of providing of coherent treatment of signals is during realization of non-coherent methods of radio-location(Видавництво Львівської політехніки, 2012) Shyncaruk, Oleg; Chesanovskiy, IvanThe questions of rise of coherence processing of radiolocation signals are examined in non-coherence impulsive facilities of radio-location.Item A procedure for a choice of the operating feature dictionary for recognition of radiation sources with means of radar monitoring(Видавництво Львівської політехніки, 2012) Kalyuzhniy, N. M.; Galkin, S. A.; Nikolaev, I. M.; Kolesnik, V. I.Approaches to a choice of the most informative combinations of signal features are considered. The procedure for a choice of the operating feature dictionary is proposed. Probabilities of true recognition and are estimated.Item A two channels I/Q-demodulator(Видавництво Львівської політехніки, 2012) Slyusar, V. І.; Serduk, P. E.In this article are analyzed one-cascade and multicascade I/Q-demodulators with two channels.Item A сombined LIFO-priority algorithm for overload control of SIP server(Видавництво Львівської політехніки, 2012) Kuzminykh, IevgeniiaIn this paper a simulation model of message service procedure in SIP server in the normal conditions and in the congestion state is represented. The paper proposes local overload control for SIP server applied FIFO discipline in normal state and LIFO discipline with priority service model during overload.Item About expediency of use of the reemission of photons for increasing light intensity of multilayer LEDs that can be exposed to radiation(Видавництво Львівської політехніки, 2010) Irkha, Vasily; Gorbachev, VictorOn the basis of the obtained experimental regular dependences the probable causes of the degradation of emission of multilayer GaAlAs-LEDs after gamma irradiation are considered.Item About the accuracy of analysis of linear parametric circuits performed by frequency- symbolic method(Видавництво Львівської політехніки, 2010) Shapovalov, Yu.; Mankowsky, S.It deals with comparison of the results of the calculations performed by frequency-symbolic method with the calculations done by MicroCAP programme and analytical solution.Item About the time measurement of radio-waves propagation in atmosphere at nanoseconds accuracy(Видавництво Львівської політехніки, 2010) Antipov, Ivan; Bondar’, Eugenia; Kostyrja, AlexandrMethods for measuring time of radio-waves propagation in troposphere are presented in article. The estimate of measurements is 1-10 nanoseconds for purpose of high-precision synchronization.Item Absolute cross-section of turbojet aviation engine calculation(Видавництво Львівської політехніки, 2012) Ryabokon, EvgenThe calculation method of three-dimensional model of turbojet aviation engine is offered, thus the form of turbine vanes with spiralling is described like parametric surface. The method allows make the calculation of absolute cross-section (ACS) of turbojet aviation engines with different geometrical parameters. The calculation results of ACS of aviation engine are presented.