Search results

article

Using conditional averaging of delayed signals to measure phase shift angle

Adam Kowalczyk, Anna Szlachta

Metrology and Measurement Systems > 2022 > Vol. 29, nr 4 > 655--667

A novel measurement method and a brief discussion of basic characteristics of measuring the phase shift angle between two sinusoidal signals of the same frequency are presented in this paper. It contains a mathematical model for using conditional averaging of a delayed signal interfered with noise to measure the phase shift angle. It also provides characteristics of conditional mean values and discusses...

article

A direct solution method for generalized stochastic eigenvalue problems of structures with random parameters

Zhiping Qiu, Nan Jiang

International Journal for Numerical Methods in Engineering > 124 > 7 > 1547 - 1563

In this paper, a direct solution method is proposed for solving generalized stochastic eigenvalue problems of structures with random uncertainties in structural parameters. Taking random parameters into consideration, predicting the statistical characteristics of the eigenvalues of structures within a probabilistic framework precisely is significant for structural analysis and design. However, the...

article

O estymacji wartości średniej napięcia sinusoidalnego

Sergiusz Sienkowski, Mariusz Krajewski

Przegląd Elektrotechniczny > 2022 > R. 98, nr 11 > 139--142

W artykule oceniono dokładność wyników estymacji wartości średniej napięcia sinusoidalnego. W tym celu zastosowano estymator wartości średniej obliczany na podstawie próbek napięcia. Wyznaczono obciążenie, wariancję i błąd średniokwadratowy estymatora.

article

Stochastic model of drug concentration level during IV-administration

Irada Dzhalladova, Miroslava Růžičková

Opuscula Mathematica > 2022 > Vol. 42, no. 6 > 833--847

A stochastic model describing the concentration of the drug in the body during its IV-administration is discussed. The paper compares a deterministic model created with certain simplifications with the stochastic model. Fluctuating and irregular patterns of plasma concentrations of some drugs observed during intravenous infusion are explained. An illustrative example is given with certain values of...

article

Statistische Verteilung von Rissabständen und Rissbreiten in Stahlbetonbauteilen

Jonas Cramer, Martin Empelmann

Beton‐ und Stahlbetonbau > 116 > 11 > 859 - 870

Der Nachweis der Rissbreite verfolgt das Ziel, Maximalwerte der Rissbreite zu begrenzen, sodass der Nachweis gemäß DIN EN 1992‐1‐1 nicht auf Basis von Mittelwerten, sondern mit charakteristischen Werten erfolgt. Da entsprechende Quantilwerte oder auch Maximalwerte versuchstechnisch nur sehr aufwendig zu erfassen sind, ist eine Validierung bestehender Nachweisformeln – insbesondere für variierende...

article

How many of the digits in a mean of 12.3456789012 are worth reporting?

R. S. Clymo

BMC Research Notes > 2019 > 12 > 1 > 1-5

Objective A computer program tells me that a mean value is 12.3456789012, but how many of these digits are significant (the rest being random junk)? Should I report: 12.3?, 12.3456?, or even 10 (if only the first digit is significant)? There are several rules-of-thumb but, surprisingly (given that the problem is so common in science), none seem to be evidence-based. Results Here I show how the significance...

article

Symbols of Multiqubit States Admitting a Physical Interpretation*

Peter Adam, Vladimir A. Andreev, Margarita A. Man’ko, Vladimir I. Man’ko

Journal of Russian Laser Research > 2018 > 39 > 4 > 360-375

We study the multiqubit states and the corresponding minimal sets of dequantizers and quantizers, such that symbols of the operators (observables) obtained with the help of the dequantizers admit a physical interpretation; more precisely, the symbols can be measured in the experiments. We consider two types of such quantities: (i) the probabilities of spin projections onto certain directions and (ii)...

article

Quantile and mean value measures of search process complexity

Jaromír Kukal, Matej Mojzeš

Journal of Combinatorial Optimization > 2018 > 35 > 4 > 1261-1285

Performance measures of metaheuristic algorithms assess the quality of a search process by statistically analysing its performance. Such criteria serve two purposes: they provide the verdict on which algorithm is better for what task, and they help applying an algorithm on a given task in the most effective way. The latter goal may be achieved by an appropriate restart strategy of the search process...

article

Integrate-and-fire models with an almost periodic input function

Piotr Kasprzak, Adam Nawrocki, Justyna Signerska-Rynkowska

Journal of Differential Equations > 2018 > 264 > 4 > 2495-2537

We investigate leaky integrate-and-fire models (LIF models for short) driven by Stepanov and μ-almost periodic functions. Special attention is paid to the properties of the firing map and its displacement, which give information about the spiking behavior of the considered system. We provide conditions under which such maps are well-defined and are uniformly continuous. We show that the LIF models...

article

Modification of the algorithm for calculating fatigue life for the criteria based on the concept of the critical plane

K. Kluger, T. Łagoda

Journal of Theoretical and Applied Mechanics > 2018 > Vol. 56 nr 1 > 191--201

The aim of this paper is to propose an algorithm for fatigue life determination with the use of widely-known criteria for the fatigue life considering proper determination of material characteristics, which are a function of the number of cycles to failure. The application of the modified algorithm has been presented within the criteria of Findley, Matake, Papadopoulos and Dang Van, and the results...

article

New definitions of mean value and variance of fuzzy numbers: An application to the pricing of life insurance policies and real options

Luca Anzilli, Gisella Facchinetti

International Journal of Approximate Reasoning > 2017 > 91 > C > 96-113

We propose a new definition of mean value and variance for fuzzy numbers whose membership functions are upper-semicontinuous but are not necessarily continuous. Our proposal uses the total variation of bounded variation functions. The proposed concepts are used for the evaluation of insurance contracts and real options in a fuzzy framework.

article

On the fourth power moment of Fourier coefficients of cusp form

Jin Jiang Li, Pan Wang Wang, Min Zhang

Acta Mathematica Sinica, English Series > 2018 > 34 > 6 > 1050-1058

Let a(n) be the Fourier coefficients of a holomorphic cusp form of weight κ = 2n ≥ 12 for the full modular group and A(x) = Ʃ_n≤xa(n). In this paper, we establish an asymptotic formula of the fourth power moment of A(x) and prove that $$\int_1^T {{A^4}\left( x \right)dx = \frac{3}{{64\kappa {\pi ^4}}}{s_{4;2}}\left( {\tilde a} \right){T^{2\kappa }} + O\left( {{T^{2\kappa - {\delta _4} + \varepsilon...

article

General fuzzy integral as a base for estimation of fuzzy quantities

Gabrijela Grujić, Zagorka Lozanov-Crvenković, Ivana Štajner-Papuga

Fuzzy Sets and Systems > 2017 > 326 > C > 69-80

Estimation of fuzzy quantities is a topic that often appears in decision making. Some of the well-known approaches are based on the integration done with respect to the probability measure and, later on, on the possibility measure and the necessity measure. The approach considered here is focused on a fuzzy measure in general as a base of integration.

article

Using either Mean or RMS values to represent current in modeling of arc welding bead geometries

Diego Costa Correia Silva, Américo Scotti

Journal of Materials Processing Technology > 2017 > 240 > C > 382-387

With the objective of assessing the representability of current signal on modeling of bead geometries, a series of experiments were carried with GTAW under parametric conditions in which the RMS values were increased while the Mean values were kept the same and vice-verse. The weight of each current representation on bead geometry was searched using penetration, fused area and bead width as responses...

article

Mean value based reversible data hiding in encrypted images

Smita Agrawal, Manoj Kumar

Optik - International Journal for Light and Electron Optics > 2017 > 130 > C > 922-934

A novel reversible data hiding technique for encrypted images is proposed in this paper. Proposed technique utilizes additive modulo 256 for encryption purpose and a property of mean for embedding watermark in the encrypted image. Preserved mean values are used for watermark extraction and image recovery. In contrast to several state of art reversible data hiding techniques for encrypted images, proposed...

article

Quality assessment of welded joints using the mean value distribution of amplitude spectrums calculated by the time window method

A. Szeleziński, A. Muc, L. Murawski

Journal of KONES > 2017 > Vol. 24, No. 2 > 263--270

In continuous monitoring systems of welded joints of thin-walled structures, a vibrodiagnostic method is the most promising. Its most important advantage is that it is effective and offers the greatest real-time research capabilities. It is used in classic NDT techniques as well as in structural health monitoring during exploitation. This work presents a measurement method of dynamic characteristics...

article

Testy ANOVA jako narzędzie wspomagające weryfikację hipotez statystycznych

Wiesława Malska, Bogusław Twaróg

Acta Scientifica Academiae Ostroviensis. Sectio A, Nauki Humanistyczne,... > 2017 > 10(2)/2017 > 148-159

W artykule przedstawiono wykorzystanie testów istotności, które wspomagają weryfikację hipotez statystycznych. Weryfikacja hipotez statystycznych opiera się na przyjęciu lub odrzuceniu hipotezy zerowej z góry przyjętym poziomem prawdo-podobieństwa α. Decyzja ta podejmowana jest jedynie na podstawie wyników próby losowej, bez badań całej zbiorowości statystycznej. Testy istotności są przydatne zwłaszcza...

article

Stanowisko do badań zmęczeniowych materiałów przy zginaniu ze skręcaniem

D. Rozumek, R. Pawliczek, J. Lewandowski

Czasopismo Inżynierii Lądowej, Środowiska i Architektury / Journal of... > 2017 > z. 64, nr 2/I > 27--38

W pracy zaprezentowano budowę, zasadę działania i pomiary na maszynie wytrzymałościowej do badań zmęczeniowych. Maszyna przeznaczona jest do badań zmęczeniowych próbek z materiałów konstrukcyjnych pracujących przy cyklicznie zmiennych obciążeniach zginających, skręcających i proporcjonalnym zginaniu ze skręcaniem. Można zadawać obciążenia z zerową lub różną od zera wartością średnią momentu. W pracy...

article

A modified augmented lagrange multiplier algorithm for toeplitz matrix completion

Chuanlong Wang, Chao Li, Jin Wang

Advances in Computational Mathematics > 2016 > 42 > 5 > 1209-1224

In this paper, a modified scheme is proposed for iterative completion matrices generated by the augmented Lagrange multiplier (ALM) method based on the mean value. So that the iterative completion matrices generated by the new algorithm are of the Toeplitz structure, which decrease the computation of SVD and have better approximation to solution. Convergence is discussed. Finally, the numerical experiments...

article

Periodic Solutions and Hydra Effect for Delay Differential Equations with Nonincreasing Feedback

Tibor Krisztin, Mónika Polner, Gabriella Vas

Qualitative Theory of Dynamical Systems > 2017 > 16 > 2 > 269-292

We consider a delay differential equation modeling production and destruction, and prove the presence of the paradoxial hydra effect. Namely, for the equation $$\dot{y}(t)=-\mu y(t)+f(y(t-1))$$ y ˙ ( t ) = - μ y ( t ) + f ( y ( t - 1 ) ) with $$\mu >0$$ μ > 0 and nonincreasing $$f:\mathbb {R}\rightarrow (0,\infty )$$ f : R → ( 0 , ∞ ) , it is shown that...

INFONA - science communication portal

Search results

Using conditional averaging of delayed signals to measure phase shift angle

A direct solution method for generalized stochastic eigenvalue problems of structures with random parameters

O estymacji wartości średniej napięcia sinusoidalnego

Stochastic model of drug concentration level during IV-administration

Statistische Verteilung von Rissabständen und Rissbreiten in Stahlbetonbauteilen

How many of the digits in a mean of 12.3456789012 are worth reporting?

Symbols of Multiqubit States Admitting a Physical Interpretation*

Quantile and mean value measures of search process complexity

Integrate-and-fire models with an almost periodic input function

Modification of the algorithm for calculating fatigue life for the criteria based on the concept of the critical plane

New definitions of mean value and variance of fuzzy numbers: An application to the pricing of life insurance policies and real options

On the fourth power moment of Fourier coefficients of cusp form

General fuzzy integral as a base for estimation of fuzzy quantities

Using either Mean or RMS values to represent current in modeling of arc welding bead geometries

Mean value based reversible data hiding in encrypted images

Quality assessment of welded joints using the mean value distribution of amplitude spectrums calculated by the time window method

Testy ANOVA jako narzędzie wspomagające weryfikację hipotez statystycznych

Stanowisko do badań zmęczeniowych materiałów przy zginaniu ze skręcaniem

A modified augmented lagrange multiplier algorithm for toeplitz matrix completion

Periodic Solutions and Hydra Effect for Delay Differential Equations with Nonincreasing Feedback

Filter options

Publication date

Content availability

Publication type

Publication language

Keywords

Data set

INFONA - science communication portal

Search results

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Publication type

Publication language

Keywords

Data set

Reporting an error / abuse

Sending the report failed

Accessibility options