71 research outputs found
Characters, Weil sums and -differential uniformity with an application to the perturbed Gold function
Building upon the observation that the newly defined~\cite{EFRST20} concept
of -differential uniformity is not invariant under EA or
CCZ-equivalence~\cite{SPRS20}, we showed in~\cite{SG20} that adding some
appropriate linearized monomials increases the -differential uniformity of
the inverse function, significantly, for some~. We continue that
investigation here. First, by analyzing the involved equations, we find bounds
for the uniformity of the Gold function perturbed by a single monomial,
exhibiting the discrepancy we previously observed on the inverse function.
Secondly, to treat the general case of perturbations via any linearized
polynomial, we use characters in the finite field to express all entries in the
-Differential Distribution Table (DDT) of an -function on the finite
field \F_{p^n}, and further, we use that method to find explicit expressions
for all entries of the -DDT of the perturbed Gold function (via an arbitrary
linearized polynomial).Comment: 22 page
-differential bent functions and perfect nonlinearity
Drawing inspiration from Nyberg's paper~\cite{Nyb91} on perfect nonlinearity
and the -differential notion we defined in~\cite{EFRST20}, in this paper we
introduce the concept of -differential bent functions in two different ways
(thus extending Kumar et al.~\cite{Ku85} classical definition). We further
extend the notion of perfect -nonlinear introduced in~\cite{EFRST20}, also
in two different ways, and show that, in both cases, the concepts of
-differential bent and perfect -nonlinear are equivalent (under some
natural restriction of the parameters). Some constructions of functions with
these properties are also provided; one such construction provides a large
class of PcN functions with respect to all in some subfield of the field
under consideration. We also show that both our classes of -differential
bents are supersets of permutation polynomials, and that Maiorana-McFarland
bent functions are not differential bent (of the first kind).Comment: 24 page
C -differential bent functions and perfect nonlinearity
17 USC 105 interim-entered record; under review.The article of record as published may be found atΒ https://doi.org/10.1016/j.dam.2021.10.010Drawing inspiration from Nybergβs paper (Nyberg, 1991) on perfect nonlinearity and the c-differential notion we defined in Ellingsen et al. (2020), in this paper we introduce the concept of c-differential bent functions in two different ways (thus extending Kumar et al. (1985) classical definition). We further extend the notion of perfect c-nonlinear introduced in Ellingsen et al. (2020), also in two different ways, and show that, in both cases, the concepts of c-differential bent and perfect c-nonlinear are equivalent (under some natural restriction of the parameters). Some constructions of functions with these properties are also provided; one such construction provides a large class of PcN functions with respect to all c in some subfield of the field under consideration. We also show that both our classes of 0-differential bents are supersets of permutation polynomials, and that MaioranaβMcFarland bent functions are not differential bent (of the first kind).Pantelimon StΔnicΔ acknowledges the sabbatical support from Naval Postgraduate School from September 2020 to July 2021
A quantum algorithm to estimate the Gowers norm and linearity testing of Boolean functions
We propose a quantum algorithm to estimate the Gowers norm of a Boolean
function, and extend it into a second algorithm to distinguish between linear
Boolean functions and Boolean functions that are -far from the set of
linear Boolean functions, which seems to perform better than the classical BLR
algorithm. Finally, we outline an algorithm to estimate Gowers norms of
Boolean functions
Analysis of the Influence of Wind Turbines on the Power Line Protection Operation
In the article an experimental power system consisting of Russian equipment, as well as 220 kV power line distance protection, are simulated in the RTDS Simulator. The settings were calculated and the polygonal characteristics of distance protection were constructed. A sequential installation of wind turbines into various nodes of the power system was carried out and the correct operation of the protection was verified. As a result of the study, the influence of wind turbines on the distance protection when they are connected between the protection installation site and the point of the short circuit is revealed. The analysis of this influence is made. Possible ways to solve the identified problems are proposed, such as the use of adaptive distance protection, as well as numerous studies of the behavior of wind turbines in various operating modes for further analysis and possible adjustment of guidelines for relay protection using new algorithms for calculating and configuring of distance protection. The results of this work can be used to improve and clarify the recommendations for tuning, produced by manufacturers of relay protection devices, which currently do not take into account the influence of wind turbines
Analysis of the Influence of Wind Turbines on the Power Line Protection Operation
In the article an experimental power system consisting of Russian equipment, as well as 220 kV power line distance protection, are simulated in the RTDS Simulator. The settings were calculated and the polygonal characteristics of distance protection were constructed. A sequential installation of wind turbines into various nodes of the power system was carried out and the correct operation of the protection was verified. As a result of the study, the influence of wind turbines on the distance protection when they are connected between the protection installation site and the point of the short circuit is revealed. The analysis of this influence is made. Possible ways to solve the identified problems are proposed, such as the use of adaptive distance protection, as well as numerous studies of the behavior of wind turbines in various operating modes for further analysis and possible adjustment of guidelines for relay protection using new algorithms for calculating and configuring of distance protection. The results of this work can be used to improve and clarify the recommendations for tuning, produced by manufacturers of relay protection devices, which currently do not take into account the influence of wind turbines
Road monitoring system based on iot technology for SmartCity
This work is devoted to the problem of automatic road quality control, which can be used by both road repair services and common drivers. This paper provides a survey of different known techniques and algorithms of finding potholes on the road and describe our own method, using accelerometer. It will be shown our device for detecting potholes on the road, which can be used, as a part of the IoT system of SmartCity. It uses data from an accelerometer for finding road bumps
Circulating levels of Bcl-2 and its expression in the nasal mucosa of patients with chronic rhinosinusitis
Aim: To evaluate expression of anti-apoptotic Bcl-2 protein in the nasal tissue and its levels in blood serum of patients with chronic rhinosinusitis with (CRSwNP) and without nasal polyps (CRSsNP).
Material and methods: Expression of Bcl-2 in the sinonasal tissue and its levels in blood serum of patients with CRSsNP and CRSwNP were evaluated immunohistochemically and using ELISA, respectively.
Results: In patients with CRSsNP, Bcl-2 was overexpressed in nasal epithelial cells mainly in the atrophic regions. However, its upregulation was also observed in regions with epithelial cell proliferation. Immunostaining for Bcl-2 was stronger both in the stroma and epithelial lining compared with control subjects. The level of Bcl-2 in blood serum was elevated in both forms of chronic rhinosinusitis with a more pronounced increase in CRSwNP.
Conclusion: CRSsNP and especially CRSwNP are associated with overexpression of anti-apoptotic Bcl-2 in nasal epithelial cells and in the lamina propria against the background of elevated circulating concentrations of Bcl-2
Investigation of the properties of magnetocaloric Mn1-xFexNiGe (0.05 β€ x β€ 0.30) films
MnNiGe-based solid solutions are currently positioned as βgreenβ magnetocaloric materials, promising for use in magnetic refrigerators [1-3]. The magnetic behavior of the MnNiGe system is strongly dependent on doping, special heat treatment, pressure imposition, etc. One of the most important factors determining the magnetic behavior of the system is the state of the sample - film or massive. Π’Π²Π΅ΡΠ΄ΡΠ΅ ΡΠ°ΡΡΠ²ΠΎΡΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ MnNiGe Π² Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ ΠΏΠΎΠ·ΠΈΡΠΈΠΎΠ½ΠΈΡΡΡΡΡΡ ΠΊΠ°ΠΊ Β«Π·Π΅Π»Π΅Π½ΡΠ΅Β» ΠΌΠ°Π³Π½ΠΈΡΠΎΠΊΠ°Π»ΠΎΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ, ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠ΅ Π΄Π»Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
Ρ
ΠΎΠ»ΠΎΠ΄ΠΈΠ»ΡΠ½ΠΈΠΊΠ°Ρ
[1-3]. ΠΠ°Π³Π½ΠΈΡΠ½ΠΎΠ΅ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ MnNiGe ΡΠΈΠ»ΡΠ½ΠΎ Π·Π°Π²ΠΈΡΠΈΡ ΠΎΡ Π»Π΅Π³ΠΈΡΠΎΠ²Π°Π½ΠΈΡ, ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠΌΠΎΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ, Π΄Π°Π²Π»Π΅Π½ΠΈΡ ΠΈ Ρ. Π. ΠΠ΄Π½ΠΈΠΌ ΠΈΠ· Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π²Π°ΠΆΠ½ΡΡ
ΡΠ°ΠΊΡΠΎΡΠΎΠ², ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΡΡΠΈΡ
ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ΅ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ, ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΠΎΠ±ΡΠ°Π·ΡΠ° - ΠΏΠ»Π΅Π½ΠΊΠΈ ΠΈΠ»ΠΈ ΠΌΠ°ΡΡΠΈΠ²Π°
Surface topography of the InSb-MnSb thin films
In that report we observe a semiconductor eutectic composite InSb-MnSb thin films, prepared by the "flash evaporation" method. The atomic force microscopy and the scanning electron microscopy were employed for investigation microstructure and surface relief of the InSb-MnSb thin films. Π ΡΡΠΎΠΌ ΠΎΡΡΠ΅ΡΠ΅ ΠΌΡ Π½Π°Π±Π»ΡΠ΄Π°Π΅ΠΌ Π·Π° ΡΠΎΠ½ΠΊΠΈΠΌΠΈ ΠΏΠ»Π΅Π½ΠΊΠ°ΠΌΠΈ ΠΏΠΎΠ»ΡΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΈΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΠ»Π΅ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ° InSb-MnSb, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Β«ΠΌΠ³Π½ΠΎΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΠΈΡΠΏΠ°ΡΠ΅Π½ΠΈΡΒ». Π‘ ΠΏΠΎΠΌΠΎΡΡΡ Π°ΡΠΎΠΌΠ½ΠΎ-ΡΠΈΠ»ΠΎΠ²ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΈ ΡΠΊΠ°Π½ΠΈΡΡΡΡΠ΅ΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΠΌΠΈΠΊΡΠΎΡΡΡΡΠΊΡΡΡΠ° ΠΈ ΡΠ΅Π»ΡΠ΅Ρ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΡΠΎΠ½ΠΊΠΈΡ
ΠΏΠ»Π΅Π½ΠΎΠΊ InSb-MnSb
- β¦