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Tytuł:
Application of spread spectrum transmission in the aspect of radio communications security
Zastosowanie transmisji z widmem rozproszonym w aspekcie bezpieczeństwa łączności radiowej
Autorzy:
Król, Robert
Powiązania:
https://bibliotekanauki.pl/articles/30145370.pdf
Data publikacji:
2020
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
communication security
operating mode
radio communications
Polish Armed Forces
frequency hopping
FH
SINCGARS
HAVE QUICK
narrow band hopping
broadband hopping
bezpieczeństwo łączności
tryb pracy
łączność radiowa
Polskie Siły Zbrojne
hopping wąskopasmowy
hopping szerokopasmowy
Opis:
This publication considers the use of spread spectrum transmissions in the aspect of threats to radio communications security. Numerous restrictions related to the previous use of specific operating modes of VHF, UHF and KF radio stations with reference to the possibilities of counteracting on the part of a potential enemy using the most modern EW (electronic warfare) systems, as well as those based on the procedures of the Russian Federation Armed Forces.
W niniejszej publikacji poddano pod rozwagę wykorzystanie transmisji z widmem rozproszonym w aspekcie zagrożeń bezpieczeństwa łączności radiowej. Wskazano na liczne ograniczenia związane z dotychczasowym wykorzystywaniem określonych trybów pracy radiostacji VHF, UHF oraz KF w odniesieniu do możliwości przeciwdziałania ze strony potencjalnego przeciwnika wykorzystującego najnowocześniejsze systemy WRE, a także bazujące na procedurach SZ Federacji Rosyjskiej.
Źródło:
Scientific Journal of the Military University of Land Forces; 2020, 52, 1(195); 121-134
2544-7122
2545-0719
Pojawia się w:
Scientific Journal of the Military University of Land Forces
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New methods of hopping (dryhopping) and their impact on sensory properties of beer
Autorzy:
Podeszwa, T.
Harasym, J.
Powiązania:
https://bibliotekanauki.pl/articles/105602.pdf
Data publikacji:
2016
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
hop
dry hopping
beer
bitterness
aroma
hopping
chmiel
piwo
gorycz
aromat
Opis:
Due to the significant changes on the beer market the flourishing development of small and craft breweries is clearly observed. Upgraded consumers’ expectation led to many technological challenges in brewing process resulting in novel methods of manufacturing of many different beer types. As bitterness and aroma are two crucial quality features of beer and many scientific efforts have been done especially in the area of hop aroma. Despite the predominant impact of main beer flavor compound e.g. linalool, other substances also contribute to the hoppy beer aroma through additive or synergistic effects not only raw materials used but also hopping regimes contribute as well to final flavor release though several new methods of hopping, particularly dry hopping have been developed.
Źródło:
Acta Innovations; 2016, 21; 81-88
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved linear complexities of the frequency hopping sequences in two optimal sets
Autorzy:
Gao, J.
Li, X.
Wei, Y.
Powiązania:
https://bibliotekanauki.pl/articles/206234.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
frequency hopping sequence
linear complexity
permutation polynominal
optimal set
Opis:
For the anti-jamming purpose, high linear complexity is desired for each frequency hopping sequence in an optimal set. Using a proper power permutation, Wang has shown that an optimal set of frequency hopping sequences with small linear complexity can be transformed into a new optimal set of frequency hopping sequences with large linear complexity. This paper conains two results. First, we extend the result of Wang. A power permutation is only suitable for a special construction of optimal set of frequency hopping sequences, see Wang (2011). However, the power permutation chosen in this paper applies to the general construction of optimal set of frequency hopping sequences. Second, by using a binomial permutation polynomial P(x), which is different from those permutations used before, we obtain a novel optimal set of frequency hopping sequences with high linear complexity from an optimal set of frequency hopping sequences with small linear complexity. By counting the number of different roots in the sequence representation, we determine the linear complexities of the frequency hopping sequences in two optimal sets transformed by the power permutation or binomial permutation.
Źródło:
Control and Cybernetics; 2012, 41, 2; 317-334
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of doping on time-of-flight transient currents in twin crystalline layers: a Monte-Carlo study
Autorzy:
Rybicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1941715.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
hopping transport
time-of-flight experiment
Monte Carlo methods
Opis:
In the paper we present the results of the Monte Carlo simulations of time-of-flight transient currents in hopping systems containing various, concentrations of transport-active centres placed in an inert matrix, and doped with various concentrations of additional transport-active centres, characterised by a different ionisation potential than the host transport centres. Such hopping centre distribution can be found in molecularly doped organic crystals. The carriers are allowed to jump between localised states of two kinds: the host transport sites of concentration c/sub 0/, and the additional doping sites of concentration c/sub d/. We deal only with the dependence of the carrier mobility on doping level, and on the difference of ionisation potentials between the host and dopant centres, at fixed external field and temperature. The results of simulations performed for various dopings, and various hopping sites distributions in energy, are discussed. The carrier jump statistics is discussed in detail.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 1; 33-48
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DS-UWB and TH-UWB Energy Consumption Comparison
Autorzy:
Elabboubi, A.
Elbahhar, F.
Heddebaut, M.
Elhillali, Y.
Powiązania:
https://bibliotekanauki.pl/articles/958085.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
energy consumption
multi-user techniques
Nakagami fading channel
TH time hopping
UWB
Opis:
The energy consumption of the wireless communication systems is starting to be unaffordable. One way to improve the power consumption is the optimization of the communication techniques used by the communication networks and devices. In order to develop an energy efficient UWB multi-user communication system, the choice of modulation and multi access technique is important. This paper compares two Ultra-wideband multi-user techniques, i.e. the DS-UWB and the TH-UWB in the case of the Nakagami-m fading channel. For the DS-UWB technique, the orthogonal (T-OVSF, ZCD) and non-orthogonal (Kasami) codes are used. For TH-UWB, authors consider different modulations (PPM, PSM, PAM). This comparison allows choosing the best solution in terms of energy consumption, data rate and communication range. Two different studies are realized to find the most efficient technique to use. In the first study, the same number of users for the different type of codes (data rate values) is chosen and the total energy consumption for several distances and path-loss coefficient is computed. In the second one, the multiusers effects (same data rate) for various values of distances and path-loss are evaluated.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 1; 101-109
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robustifying analysis of the direct adaptive control of unknown multivariable nonlinear systems based on a new neuro-fuzzy method
Autorzy:
Theodoridis, D. C.
Boutalis, Y.S.
Christodoulou, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/91598.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
nonlinear systems
control
neuro-fuzzy dynamical system
fuzzy systems
FS
fuzzy recurrent high order neural network
F-RHONN
adaptive regulator
parameter
“Hopping”
“Modified Hopping”
modeling errors
asymptotic regulation
Opis:
In this paper, we are dealing with the problem of directly regulating unknown multivariable affine in the control nonlinear systems and its robustness analysis. The method employs a new Neuro-Fuzzy Dynamical System definition, which uses the concept of Fuzzy Systems (FS) operating in conjunction with High Order Neural Networks. In this way the unknown plant is modeled by a fuzzy - recurrent high order neural network structure (F-RHONN), which is of the known structure considering the neglected nonlinearities. The development is combined with a sensitivity analysis of the closed loop in the presence of modeling imperfections and provides a comprehensive and rigorous analysis showing that our adaptive regulator can guarantee the convergence of states to zero or at least uniform ultimate boundedness of all signals in the closed loop when a not-necessarily-known modeling error is applied. The existence and boundedness of the control signal is always assured by employing a method of parameter “Hopping” and “Modified Hopping”, which appears in the weight updating laws. Simulations illustrate the potency of the method showing that by following the proposed procedure one can obtain asymptotic regulation despite the presence of modeling errors. Comparisons are also made to simple recurrent high order neural network (RHONN) controllers, showing that our approach is superior to the case of simple RHONN’s.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 1; 59-79
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pragmatic Distribution Based Routing Cluster to Improve Energy Efficient Cluster lifetime for Wireless Sensor Networks
Autorzy:
SV, Harish
NV, Archan
Powiązania:
https://bibliotekanauki.pl/articles/27311930.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
cluster
routing protocol
Energy hole
fitness function
throughput
energy delay
hopping fairness
Opis:
Energy consumed by the sensor nodes are more sporadic in a sensor networks. A skilled way to bring down energy consumption and extend maximum life-time of any sensor present can be of evenly and unevenly distributed random area networks. Cluster heads are more responsible for the links between the source and destination. Energy consumption are much compare to member nodes of the network. Re-clustering will take place if the connectivity in the distributed network failure occurs in between the cluster networks that will affects redundancy in the network efficiency. Hence, we propose pragmatic distribution based routing cluster lifetime using fitness function (PDBRC) prototype is better than the existing protocol using MATLAB 2021a simulation tool.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 2; 353--360
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiary właściwości elektrycznych nanokompozytów (CoFeZr)x + (Al2O3)1-x
The measurements of the electrical properties of (CoFeZr)x + (Al2O3)1-x nanocomposites
Autorzy:
Kołtunowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/152236.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
nanokompozyty
przewodność skokowa
studnie kwantowe
rezystancja
nanocomposites
hopping recharging
quantum wells
resistance
Opis:
W pracy przedstawiono wyniki pomiarów właściwości elektrycznych nanokompozytów (CoFeZr)x + (Al2O3)1-x w oparciu o prąd przemienny o częstotliwości z zakresu od 50 Hz do 1 MHz. Pomiary wykonano w zakresie temperatur od 77 K do 373 K. Przeprowadzono analizę uzyskanych wyników i zaproponowano sposób przenoszenia ładunków elektrycznych pomiędzy studniami kwantowymi.
The paper presents the results of the measurements of the electrical properties of (CoFeZr)x + (Al2O3)1-x nanocomposites performed on the alternating current in the frequency range from 50 Hz to 1 MHz. The measurements were done in the temperature range from 77 K to 373 K. The analysis of the results were performed and the mechanism of the carrying electric charges between quantum wells was proposed.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 11, 11; 44-46
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leg stiffness adjustment during hopping at different intensities and frequencies
Autorzy:
Mrdakovic, V.
Ilic, D.
Vulovic, R.
Matic, M.
Jankovic, N.
Filipovic, N.
Powiązania:
https://bibliotekanauki.pl/articles/307107.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
połączenie
węzeł podatny
sztywność
skoki
joint stiffness
jumping performance
preferred hopping frequency
spring-mass model
Opis:
Understanding leg and joint stiffness adjustment during maximum hopping may provide important information for developing more effective training methods. It has been reported that ankle stiffness has major influence on stable spring-mass dynamics during submaximal hopping, and that knee stiffness is a major determinant for hopping performance during maximal hopping task. Furthermore, there are no reports on how the height of the previous hop could affect overall stiffness modulation of the subsequent maximum one. The purpose of the present study was to determine whether and how the jump height of the previous hop affects leg and joint stiffness for subsequent maximum hop. Ten participants completed trials in which they repeatedly hopped as high as possible (MX task) and trials in which they were instructed to perform several maximum hops with 3 preferred (optimal) height hops between each of them (P3MX task). Both hopping tasks were performed at 2.2 Hz hopping frequency and at the participant's preferred (freely chosen) frequency as well. By comparing results of those hopping tasks, we found that ankle stiffness at 2.2 Hz (p=0.041) and knee stiffness at preferred frequency (p=0.045) was significantly greater for MX versus P3MX tasks. Leg stiffness for 2.2 Hz hopping is greater than for the preferred frequency. Ankle stiffness is greater for 2.2 Hz than for preferred frequencies; opposite stands for knee stiffness. The results of this study suggest that preparatory hop height can be considered as an important factor for modulation of maximum hop.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 3; 69-76
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, characterization and magnetotransport behavior of La-based double layered manganites
Autorzy:
Reddy, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1054876.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
double layered manganites
electrical transport
magnetoresistance
variable range hopping
spin-glass-like behavior
magnon scattering
Opis:
The single phase double layered manganites La_{1.2}Sr_{1.8-x}Ca_xMn₂O₇ (x=0.0, 0.3) were synthesized by the sol-gel method. The electrical resistivity at various magnetic fields over a temperature range 4.2-300 K was measured. The insulator-to-metal transition temperature (T_{IM}) decreases from 123 K (x=0.0) to 70 K (x=0.3). The spin-glass (SG)-like transition is observed in both the samples at 30 K (T_{SG} - SG-like transition temperature). The transport behavior is analyzed in the entire temperature range (4.2-300 K) in three different regions: paramagnetic insulating region (T>T_{IM}), ferromagnetic metallic region (T_{SG}T_{IM} in the two samples. At T_{SG}
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1544-1549
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved CSE with DLS-MMSE Criteria in TH-UWB System
Autorzy:
Djebbari, Ali
Elahmar, Sid Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/2058501.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
channel shortening equalizer
inter-symbol interferences
rake receiver
time hopping
ultra-wide band
ZF-MMSE
Opis:
This article presents a study on the use of deter ministic least squares criteria combined with the minimum mean square error method for the purpose of computing filter coefficients of the channel shortening equalizer. This method is well known to alleviate inter-symbol interference in time hopping UWB systems. The validity of this method is applied to shorten the impulse response of the effective UWB channels and, therefore, reduce the complexity of the rake receiver. Results show a very promising advantage compared to partial rake (P-Rake), selective-rake (S-Rake) and optimal maximum shortening signal-to-noise ratio methods.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 1; 93--98
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge carrier mobility in non-equilibrated transport in molecular materials
Ruchliwość nośników ładunku w przewodnictwie nierównowagowym materiałów molekularnych
Autorzy:
Kania, Sylwester
Kościelniak-Mucha, Barbara
Kuliński, Janusz
Słoma, Piotr
Wojciechowski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/952824.pdf
Data publikacji:
2019
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
charge transfer mobility
photocurrent
hopping transport
Marcus-Hush theory
ruchliwość nośników ładunku
fotoprąd
transport hoppingowy
teoria Marcusa-Husha
Opis:
Non-equilibrated transport of charge carriers in the molecular material depends on the structure and packing of the molecules. Explanation of the measurements of the photocurrent generated with use of UV flash light in organic layer needs to define the quantity of charge carriers mobility. Definition of this quantity in the scope of some defined transport model requires the detailed analysis of generation, recombination and charge transfer between neighbouring molecules. The problem is discuss on the basis of transport properties of two anthracene derivatives.
Źródło:
Scientific Bulletin. Physics / Technical University of Łódź; 2019, 40; 37-46
1505-1013
2449-982X
Pojawia się w:
Scientific Bulletin. Physics / Technical University of Łódź
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A kinetic equation for repulsive coalescing random jumps in continuum
Autorzy:
Pilorz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/747233.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Coalescence
coagulation
hopping particles
individual-based model
configuration spaces
infinite particle system
microscopic dynamics
Vlasov scaling
kinetic equation
Opis:
A continuum individual-based model of hopping and coalescing particles is introduced and studied. Its microscopic dynamics are described by a hierarchy of evolution equations obtained in the paper. Then the passage from the micro- to mesoscopic dynamics is performed by means of a Vlasov-type scaling. The existence and uniqueness of solutions of the corresponding kinetic equation are proved.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2016, 70, 1
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of a planar robot in the flight phase using transverse function approach
Autorzy:
Pazderski, D.
Kozłowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/201212.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transverse functions
hopping robot
space manipulator
nonholonomic system
control motion task
systems on Lie groups
skaczący robot
manipulator przestrzenny
nieholonomiczny układ
Opis:
This paper deals with stabilization and tracking control problems defined with respect to a planar mechanical structure similar to Raibert’s robot. The proposed control solution is based on formal analysis of the control system on a Lie group. In order to take advantage of Lie group theory a dynamic extension of the robot kinematics is introduced. To cope with non-zero angular momentum the controller based on transverse functions is employed. Properties of the closed-loop control system are investigated based on simulations including practical stabilization at neighborhood of a constant point or a reference trajectory.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 759-770
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of BER using RSC code for Optical Code Division Multiple Access Networks
Autorzy:
Panda, Satyasen
Powiązania:
https://bibliotekanauki.pl/articles/1178316.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cross Correlation (CC)
Multiple Access Interface (MAI)
Optical Code Division Multiple Access (OCDMA)
Random Sparse Code (RSC)
Wavelength hopping time spreading (WHTS)
Opis:
In this study, a two dimensional (2-D) wavelength hopping and time spreading (WHTS) optical code division multiple access (OCDMA) code is designed using Sparse ruler technique. The proposed 64 bit 2-D code is constructed by an algorithm based on random spacing of sparse codes referred in this work as Random Sparse Code (RSC). The performance of the proposed 2-D RSC is evaluated in terms of bit error rate (BER), received signal power and time domain analysis of received signals. The system performance of the OCDMA system utilizing 2-D RSC code improved significantly due to less BER, low cross correlation property and simple encoder/decoder design. The output BER is much lower at a data rate of 1.25 gbps and 2.5 gbps for a distance of 100 km with ITU-T standard single mode fiber with attenuation level of 0.2dB/km.
Źródło:
World Scientific News; 2017, 81, 2; 106-120
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
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