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Tytuł:
Multiple Endpoints
Wielokrotne punkty krańcowe
Autorzy:
Parys, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/906882.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
multiple comparisons
multiple endpoints
bootstrap approach
Opis:
In ANOVA we are mainly based on inter-treatment comparisons. Another common problems arising in biometric studies (especially in biomedical studies) is that of comparing two groups of patients (treatment and a control group) based on multiple response (called multiple endpoints). In this paper we present the continuos and discrete approaches to multiple endpoints. In the case of continuous multiple endpoints we have common assumption in that the covariance matrices in group of the control and observation are equal. Let ρ be the correlation coefficient between Y₁, and Yj endpoints and ρ₁, be the raw ρ-value obtained using some tests statistics for the i-th endpoints. We can also proposed a general bootstrap approach which can be used to estimate the ρ-value without making any parametric and distributional or correctional assumptions. Binary outcomes are common in medical studies. We present the modified Bonfferroni procedures and permutational procedures and we compare these procedures to each other.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2007, 206
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear multiple model particle filters algorithm for tracking multiple targets
Autorzy:
Sebbagh, A.
Tebbikh, H.
Powiązania:
https://bibliotekanauki.pl/articles/229441.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
estimation
particle filter
multiple targets tracking
multiple model approach
Opis:
The paper addresses multiple targets tracking problem encountered in number of situations in signal and image processing. In this paper, we present an efficient filtering algorithm to perform accurate estimation in jump Markov nonlinear systems, which we aim to contribute in solving the problem of multiple targets tracking using bearings-only measurements. The idea of this algorithm consists of the combination between the multiple model approach and particle filtering methods, which give a nonlinear multiple model particle filters algorithm. This algorithm is used to estimate the trajectories of multiple targets assumed to be nonlinear, from their noisy bearings.
Źródło:
Archives of Control Sciences; 2011, 21, 1; 37-60
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of Multiple Access Techniques Applicable for Maritime Satellite Communications
Autorzy:
Ilcev, S. D.
Powiązania:
https://bibliotekanauki.pl/articles/116635.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Maritime Distress and Safety System (GMDSS)
Maritime Mobile Satellite Communications (MMSC)
Multiple Access (MA)
Multiple Access Techniques
Code Division Multiple Access (CDMA)
Time Division Multiple Access (TDMA)
Frequency Division Multiple Access (FDMA)
Random (Packet) Division Multiple Access (RDMA)
Opis:
In this paper are introduced fundamentals, characteristics, advantages and disadvantages of Multiple Access (MA) employed as transmission techniques in the Maritime Mobile Satellite Communications (MMSC) between ships and Coast Earth Station (CES) via Geostationary Earth Orbit (GEO) or Not-GEO satellite constellations. In fixed satellite communication, as a rule, especially in MMSC many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users can be solved by using MA technique, such as Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), Space Division Multiple Access (SDMA) and Random (Packet) Division Multiple Access (RDMA). Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with complete charge and to create a different MA to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 529-540
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Closed Bootstrap Multiple Test Procedure
Wielokrotny bootstrapowy test domknięcia
Autorzy:
Domański, Czesław
Parys, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/905267.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
closed multiple tests
bootstrap technique
multiple comparisons
Opis:
In this paper we present how to apply the ideas of bootstrap and closed testing procedures on a multiple comparison test. We consider L samples of size n2, ..., n, from L distributions, with expected values uv u2, ..., uL, are to be compared. We consider the stepwise procedures introduced by Ho l m (1977). The test in each step is performed by means of the bootstrap technique. This procedures are always closed, but just the fact that a procedure is stepwise does not guarantee that it is closed. We discuss whether the appropriate conditions are met to make our bootstrap procedure closed. When the test is performed on very few observations the significance level is sometimes only approximately kept. However, since the approximation are due to the bootstrap, and not to the test procedure itself, the multiple test discussed in this paper is likely to keep the multiple level of significance.
W pracy zaprezentowano zastosowania idei bootstrapowej i domkniętych procedur testowych we wnioskowaniu dotyczącym porównań wielokrotnych. Rozważmy L prób o liczebnościach nlt n2, ..., nL, odpowiednio pochodzących z L populacji. Porównuje się wartości oczekiwane //,, /i2, ..., p.L. W procedurze kroczącej dla porównań wielokrotnych zaproponowana przez Holma (1977) zastosowano technikę bootstrapową. Procedura jest niezależna od rozkładów badanych populacji, liczby badanych hipotez, równej liczby prob. Jest procedurą domkniętą, przez co utrzymany jest wielokrotny poziom istotności a na poziomie z góry ustalonym.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2003, 164
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple criteria ranking decision support
Autorzy:
Chmielewski, M.
Kaliszewski, I.
Powiązania:
https://bibliotekanauki.pl/articles/206087.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
multiple criteria ranking
interactive multiple criteria decision making
holistic preferences
atomistic preferences
model building
Opis:
We propose a methodology to support decisions on how to construct rankings of objects which account for decision makers' preferences. As it is not always so that objects to be ranked are known upfront, the methodology is focused on constructing ranking algorithms rather than rankings themselves. The methodology builds on Multiple Criteria Decision Making paradigms. To operationalize it we provide a consistent interactive framework which allows the decision maker to express his preferences with respect to objects directly, with respect to the criteria selection process (multiple criteria model building), and with respect to attributes resulting from the selected criteria. The methodology is illustrated by a numerical example of municipality rankings.
Źródło:
Control and Cybernetics; 2011, 40, 4; 1161-1187
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple myeloma – cancer among elderly people
Autorzy:
Januszewska, Joanna
Świderska-Kołacz, Grażyna
Zmorzyński, Szymon
Powiązania:
https://bibliotekanauki.pl/articles/472516.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
multiple myeloma
etiology of multiple myeloma
epidemiology
prognostic factors
genetic mutations
chromosomal abberration
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Biologiae Pertinentia; 2016, VI; 52-61
2083-7267
2450-3487
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Biologiae Pertinentia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disjunctive Multiple-Conclusion Consequence Relations
Autorzy:
Nowak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/750032.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
multiple-conclusion consequence relation
closure operation
Galois connection
Opis:
The concept of multiple-conclusion consequence relation from [8] and [7] is considered. The closure operation C assigning to any binary relation r (dened on the power set of a set of all formulas of a given language) the least multiple-conclusion consequence relation containing r, is dened on the grounds of a natural Galois connection. It is shown that the very closure C is an isomorphism from the power set algebra of a simple binary relation to the Boolean algebra of all multiple-conclusion consequence relations.
Źródło:
Bulletin of the Section of Logic; 2019, 48, 4
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controlling the effect of multiple testing in Big Data
Autorzy:
Denkowska, Sabina
Powiązania:
https://bibliotekanauki.pl/articles/585035.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
multiple testing
FDR
Big Data
Opis:
Big Data poses a new challenge to statistical data analysis. An enormous growth of available data and their multidimensionality challenge the usefulness of classical methods of analysis. One of the most important stages in Big Data analysis is the verification of hypotheses and conclusions. With the growth of the number of hypotheses, each of which is tested at significance level, the risk of erroneous rejections of true null hypotheses increases. Big Data analysts often deal with sets consisting of thousands, or even hundreds of thousands of inferences. FWER-controlling procedures recommended by Tukey [1953], are effective only for small families of inferences. In cases of numerous families of inferences in Big Data analyses it is better to control FDR, that is the expected value of the fraction of erroneous rejections out of all rejections. The paper presents marginal procedures of multiple testing which allow for controlling FDR as well as their interesting alternative, that is the joint procedure of multiple testing MTP based on resampling [Dudoit, van der Laan 2008]. A wide range of applications, the possibility of choosing the Type I error rate and easily accessible software (MTP procedure is implemented in R multtest package) are their obvious advantages. Unfortunately, the results of the analysis of the MTP procedure obtained by Werft and Benner [2009] revealed problems with controlling FDR in the case of numerous sets of hypotheses and small samples. The paper presents a simulation experiment conducted to investigate potential restrictions of MTP procedure in case of large numbers of inferences and large sample sizes, which is typical of Big Data analyses. The experiment revealed that, regardless of the sample size, problems with controlling FDR occur when multiple testing procedures based on minima of unadjusted p-values ( ) are applied. Moreover, the experiment indicated the serious instability of the results of the MTP procedure (dependent on the number of bootstrap samplings) if multiple testing procedures based on minima of unadjusted p-values ( ) are used. The experiment described in the paper and the results obtained by Werft, Benner [2009] and Denkowska [2013] indicate the need for further research on MTP procedure.
Źródło:
Mathematical Economics; 2014, 10(17); 5-16
1733-9707
Pojawia się w:
Mathematical Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examples of Objectified Multiple Criteria Ranking in the Selection of Infrastructural Projects
Autorzy:
Klimasara, E.
Wierzbicki, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/308171.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
multiple criteria ranking
objectified multiple criteria ranking
objectified ranking method
subjective ranking
Opis:
The paper addresses the issue of multiple criteria rankings of infrastructural projects (buildings, roads, etc.). Although the amount of literature devoted to this subject is considerable, all methods proposed produce subjective rankings, dependent on a direct or indirect definition of weighting coefficients applicable to subsequent evaluation criteria. Infrastructural projects are usually selected and approved collegially, however, by a group of decision makers with preferences that may potentially differ significantly. Therefore, an objectified ranking, independent from subjectively defined weighting coefficients, is needed for infrastructural projects. Such a ranking is proposed, analyzed and applied by the authors of this paper. This ranking depends originally only on the multiple objective evaluation data, i.e. the values of evaluation criteria related to decision scenarios or alternatives. Such an approach does not render a fully objective ranking, since one of this kind does not exist at all. Even the choice of the ranking method is a subjective decision, but it is objectified to the extent possible. The paper presents several examples of multiple criteria evaluation of infrastructural projects, derived from literature, and compares subjective rankings published in literature with objectified rankings that are independent of weighting coefficients.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 4; 18-25
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incorporating Multiple Intelligences Theory into English classes
Autorzy:
Peters, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1193964.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
English language
Howard Gardner
Multiple Intelligences Theory
learners
Opis:
The purpose of this thesis is to analyze the influence of Multiple Intelligences Theory on the process of acquiring a foreign language. MI theory developed by Howard Gardner (1983), says that every single individual possesses eight different types of intelligences: Linguistic, Logical-Mathematical, Musical, Spatial, Bodily-Kinesthetic, Interpersonal, Intrapersonal, and Naturalist. It stands in opposition to the belief that intelligence is an innate entity which we inherit or we are born with. Nevertheless, not everybody has eight very well-developed intelligences, some may be dominant or underdeveloped. Moreover, Gardner claims that all these types of intelligence may be improved. As a result, learners of English language are able to know themselves better and find appropriate milieu in which they would feel comfortable and safe. Different intelligence capacities provide various ways of knowing, acquiring, understanding, and learning about the surrounding world. Hence, teaching with the knowledge concerning students’ dominant intelligences is perceived as fruitful and lucrative because then educators may nurture their intelligences.
Źródło:
World Scientific News; 2015, 17; 1-63
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What are multiple primary malignancies?
Autorzy:
Romaszko, Anna
Doboszyńska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/552224.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
early diagnosis
multiple primary malignancies
primary health care.
Źródło:
Family Medicine & Primary Care Review; 2017, 1; 75-79
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise Generated by Multiple-Jet Nozzles With Conical Profiles
Autorzy:
Sheen, S. C.
Powiązania:
https://bibliotekanauki.pl/articles/91211.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
jet noise
multiple-jet nozzle
ultrasound
Opis:
Conical multiple-jet nozzles, which reduce the risk of nozzle openings being blocked, are tested for their effectiveness in noise reduction. Nozzles with different exit spacings are tested. It is found that the multiple-jet design significantly decreases noise levels in the audible range by shifting emitted sound power to higher and ultrasonic frequencies. No significant difference in noise characteristics between exits distributed on a flat plane and beveled exits on a conical surface is observed. When the exits are more densely distributed, there is a trend of spectra shifting back toward the low frequency. This phenomenon is found to increase sound levels in a certain range of frequencies much lower than the peak one. Although this increase contributes little to the total emitted sound power, it is an important factor in determining the sound levels of audible noise.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 3; 287-299
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating multiple-cause mortality in Poland
Autorzy:
Fihel, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1827564.pdf
Data publikacji:
2020-12-30
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
causes of death
mortality
multimorbidity
multiple causes of death
Polska
Opis:
Progress in life expectancy and the growing number of people living to old age intensify the phenomenon of multi-morbidity, defined as the coexistence of several chronic diseases. By exploiting all the medical information in death certificates, the multiple causes of death (MCoD) approach serves to investigate complex pathological processes that lead eventually to death. This is the first MCoD analysis for Poland and its objective is twofold: to examine the quality of information on contributing causes of death, in particular in the regional dimension, and to assess the scale of multi-morbidity involving conditions that are becoming more and more frequent in ageing populations. The analysis is carried out for all deaths that took place in Poland in 2013. The results show that medical doctors issuing death certificates often define contributing causes of death, but a large part of this information includes unknown or ill-defined conditions. Several conditions favour the certification of well-defined contributing causes: when death occurs in hospital, or is due to underlying causes other than cardiovascular, the number of contributing conditions is higher. Important regional differences are observed in this regard. The analysis highlights the importance of diseases that are rarely certified as the underlying causes, but often contribute to mortal conditions, such as diseases of the blood and the blood-forming organs, diseases of the skin and subcutaneous tissue, diseases of the genitourinary system or mental and behavioural disorders.
Źródło:
Studia Demograficzne; 2020, 178, 2; 53-73
0039-3134
Pojawia się w:
Studia Demograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple Linear Regression Using Cholesky Decomposition
Autorzy:
Sumiati, Ira
Handoyo, Fiyan
Purwani, Sri
Powiązania:
https://bibliotekanauki.pl/articles/1031897.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cholesky decomposition
Multiple linear regression
covariance matrix
Opis:
Various real-world problem areas, such as engineering, physics, chemistry, biology, economics, social, and other problems can be modeled with mathematics to be more easily studied and done calculations. One mathematical model that is very well known and is often used to solve various problem areas in the real world is multiple linear regression. One of the stages of working on multiple linear regression models is the preparation of normal equations which is a system of linear equations using the least-squares method. If more independent variables are used, the more linear equations are obtained. So that other mathematical tools that can be used to simplify and help to solve the system of linear equations are matrices. Based on the properties and operations of the matrix, the linear equation system produces a symmetric covariance matrix. If the covariance matrix is also positive definite, then the Cholesky decomposition method can be used to solve the system of linear equations obtained through the least-squares method in multiple linear regression. Based on the background of the problem outlined, such that this paper aims to construct a multiple linear regression model using Cholesky decomposition. Then, the application is used in the numerical simulation and real case.
Źródło:
World Scientific News; 2020, 140; 12-25
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple sclerosis – new therapeutic directions
Autorzy:
Łowiec, Paweł
Trzonkowski, Piotr
Chwojnicki, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/895817.pdf
Data publikacji:
2019-06-04
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
multiple sclerosis
neuroprotection
novel therapies
remyelination
gut microbiome
Opis:
Multiple sclerosis (MS) is a chronic inflammatory and neurodegenerative disease which affects the central nervous system. Currently, there are numerous disease-modifying therapies for this condition. Most of them address the inflammatory aspects of the disease and are most effective in the relapsing-remitting stages of multiple sclerosis. However, none of them can completely stop the progression of MS and they are usually associated with adverse effects. There is an ongoing search for novel approaches that involve different modes of action. Here, we discuss examples of new immunomodulating agents such as antigen-specific therapies, neuroprotectants, regenerative strategies and gut microbiota modification.
Źródło:
European Journal of Translational and Clinical Medicine; 2019, 2, 1; 7-22
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three step procedure for a multiple criteria problem of project portfolio scheduling
Autorzy:
Krzeszowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/406383.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
project scheduling
multiple criteria analysis
Opis:
The project portfolio scheduling problem as a multiple criteria decision making problem and a three step procedure to solve this problem have been presnted. In the first step, the problem was described by a multiple criteria mathematical model. Three criteria have been considered: minimization of the sum of penalties for projects delays, minimization of resource overuse and NPV maximization. In the second step, non-dominated solutions were identified by using an elitist evolutionary algorithm for multiple optimization. In the third step, an interactive procedure has been applied to choose the final solution. An example of a portfolio of IT projects was used for computations.
Źródło:
Operations Research and Decisions; 2013, 23, 4; 55-74
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple soft fault diagnosis of BJT circuits
Autorzy:
Tadeusiewicz, M.
Hałgas, S.
Powiązania:
https://bibliotekanauki.pl/articles/221281.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog circuits
BJT circuits
fault diagnosis
multiple faults
Opis:
This paper deals with multiple soft fault diagnosis of nonlinear analog circuits comprising bipolar transistors characterized by the Ebers-Moll model. Resistances of the circuit and beta forward factor of a transistor are considered as potentially faulty parameters. The proposed diagnostic method exploits a strongly nonlinear set of algebraic type equations, which may possess multiple solutions, and is capable of finding different sets of the parameters values which meet the diagnostic test. The equations are written on the basis of node analysis and include DC voltages measured at accessible nodes, as well as some measured currents. The unknown variables are node voltages and the parameters which are considered as potentially faulty. The number of these parameters is larger than the number of the accessible nodes. To solve the set of equations the block relaxation method is used with different assignments of the variables to the blocks. Next, the solutions are corrected using the Newton-Raphson algorithm. As a result, one or more sets of the parameters values which satisfy the diagnostic test are obtained. The proposed approach is illustrated with a numerical example.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 663-674
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of an LSTM-based NOMA Detector Over Time Selective Nakagami-m Fading Channel Conditions
Autorzy:
Shankar, Ravi
Bangare, Jyoti L.
Kumar, Ajay
Gupta, Sandeep
Mehraj, Haider
Kulkarni, Shriram S.
Powiązania:
https://bibliotekanauki.pl/articles/2142313.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
deep learning
DL
multiple-input multiple-output
MIMO
non-orthogonal multiple access
NOMA
orthogonal multiple access
OMA
Opis:
This work examines the efficacy of deep learning (DL) based non-orthogonal multiple access (NOMA) receivers in vehicular communications (VC). Analytical formulations for the outage probability (OP), symbol error rate (SER), and ergodic sum rate for the researched vehicle networks are established Rusing i.i.d. Nakagami-m fading links. Standard receivers, such as least square (LS) and minimum mean square error (MMSE), are outperformed by the stacked long-short term memory (S-LSTM) based DL-NOMA receiver. Under real time propagation circumstances, including the cyclic prefix (CP) and clipping distortion, the simulation curves compare the performance of MMSE and LS receivers with that of the DL-NOMA receiver. According to numerical statistics, NOMA outperforms conventional orthogonal multiple access (OMA) by roughly 20% and has a high sum rate when considering i.i.d. fading links.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 3; 17--24
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple radical theories
Autorzy:
Gardner, B. J.
Powiązania:
https://bibliotekanauki.pl/articles/724568.pdf
Data publikacji:
1979
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Colloquium Mathematicum; 1979, 41, 2; 345-351
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On multiple test procedures
Autorzy:
Holm, Sture
Powiązania:
https://bibliotekanauki.pl/articles/1361399.pdf
Data publikacji:
1980
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Banach Center Publications; 1980, 6, 1; 159-168
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Axioms of multiple choice
Autorzy:
Lévy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1382416.pdf
Data publikacji:
1962
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1961-1962, 50, 5; 475-483
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nieklasyczne procedury testowań wielokrotnych
Non-Classical Multiple Testing Procedures
Autorzy:
Denkowska, Sabina
Powiązania:
https://bibliotekanauki.pl/articles/422773.pdf
Data publikacji:
2013
Wydawca:
Główny Urząd Statystyczny
Tematy:
testowanie wielokrotne
FWER
FDR
repróbkowanie
MTP
multiple testing
resampling
Opis:
Zakres zastosowań klasycznych procedur testowań wielokrotnych jest ograniczony z powodu założeń modelowych, a w wielu sytuacjach badawczych rozwiązań klasycznych po prostu brak. Kontrolę efektu testowania wielokrotnego umożliwiają wówczas nieklasyczne procedury testowań wielokrotnych. Proste obliczeniowo, o szerokim zakresie zastosowań, brzegowe procedury testowań wielokrotnych nie uwzględniają jednak łącznego rozkładu statystyk testowych, przez co są bardziej konserwatywne od procedur łącznych. Zakres zastosowań procedur łącznych Westfalla i Younga (1993) jest natomiast ograniczony ze względu na wymóg obrotowości podzbioru. Ciekawą alternatywę stanowią dedykowane badaniom genetycznym procedury łączne, zaproponowane przez Dudoit oraz van der Laana (2008). Szeroki zakres zastosowań, możliwość wyboru miary błędu I rodzaju oraz powszechnie dostępne, oprogramowanie (procedura MTP jest zaimplementowana w pakiecie multtest w R), to ich istotne zalety. Niestety, badania nad procedurą MTP przeprowadzone przez Werfta i Bennera (2009) pokazały problemy z kontrolą miary FDR w przypadku bardzo dużej liczby testowanych hipotez i małej liczebności prób. Z kolei zaprezentowany w artykule eksperyment symulacyjny pokazał, że procedura MTP nie zapewnia również kontroli FWER na z góry zadanym poziomie.
The range of applications of classical multiple testing procedures is limited due to model assumptions, and in many cases classic solutions are non-existent. In such situations non-classical multiple testing procedures allow to control the effect of multiple testing. Although they are popular for computational simplicity and a wide range of applications, marginal multiple testing procedures do not take into account joint distribution of test statistics, which make them more conservative than joint multiple testing procedures. The range of applications of joint procedures introduced by Westfall and Young (1993) is limited due to the subset pivotality requirement. Thus, joint multiple testing procedures suggested by Dudoit and van der Laan (2008) seem very promising. A wide range of applications, the possibility of choosing the Type I error rate and easily accessible software (MTP procedure is implemented in R multtest package) are their obvious advantages. Unfortunately, the results of the analysis of MPT procedure obtained by Werft and Benner (2009) revealed that it does not control FDR in case of numerous sets of hypotheses and small samples. Furthermore, the simulation experiment presented in the article showed that MTP procedure does not control FWER, either.
Źródło:
Przegląd Statystyczny; 2013, 60, 4; 461-476
0033-2372
Pojawia się w:
Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekonomia złożoności a równowaga wielopunktowa
Complexity economics vs. multiple equilibria
Autorzy:
Dąbrowski, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/583407.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
ekonomia złożoności
równowaga wielopunktowa
complexity economics
multiple equilibria
Opis:
Poszukiwanie mechanizmów harmonizujących i stabilizujących procesy ekonomiczne prowadziło do stawiania praktycznego problemu znajdowania, stabilności i jednoznaczności równowagi jako głównego obszaru badań (stabilizacja równowagi w systemie). Możliwość występowania dodatnich sprzężeń zwrotnych w systemie ekonomicznym generuje dwa nowe problemy jakimi są równowaga wielopunktowa oraz dynamika systemu ekonomicznego. Są to dwa istotne skutki reakcji systemu ekonomicznego na zmiany (szoki) w warunkach niestabilności. Idea równowagi wielopunktowej powoduje konieczność wyjścia poza ekonomię heterodoksyjną, co jest współcześnie coraz częściej akceptowane przez ekonomistów. Badanie zjawisk równowag wielopunktowych wymaga skierowania myślenia ekonomistów w stronę ekonomii złożoności jako syntezy wielu podejść heterodoksyjnych z głównym nurtem ekonomii. Celem artykułu jest przybliżenie problemów równowag wielopunktowych i koncepcji ekonomii złożoności we współczesnej literaturze przedmiotu.
The central problem in mainstream economics was in particular the search for mechanisms harmonizing and stabilizing economic processes (the invisible hand of the market). This led to the practical problem of finding, stability and uniqness of the equlibrium as the main area of research (stabilization of the system). The study of the states of equilibrium is important and interesting, but it should not concern mainly the conditions of existence and uniqueness. The possibility of positive feedback in the economic system generates two new problems, such as multiple equilibrium and dynamics (evolution) of the economic system. These are two important effects of the economic system’s reaction to changes (shocks) in conditions of instability. The aim of the article is to present the problems of multiple equilibria and the concepts of complexity economics in contemporary literature on the subject.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2018, 529; 58-70
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical multiple-image encryption in discrete multiple-parameter fractional Fourier transform scheme using complex encoding, theta modulation and spectral fusion
Autorzy:
Luan, Guangyu
Zhong, Zhi
Shan, Mingguang
Powiązania:
https://bibliotekanauki.pl/articles/1835767.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical security
optical encryption
multiple images
multiplexing
crosstalk
Opis:
We present a novel encryption method for multiple images in a discrete multiple-parameter fractional Fourier transform scheme, using complex encoding, theta modulation and spectral fusion. All pairs of original images are encoded separately into a complex signal. The spectrum of each complex signal can then be scattered into various positions in the spectral plane and multiplexed into one spectral image with a combination of theta modulation and spectral fusion. After Fourier transforming back to the spatial domain, the multiplexed signal is encrypted in the discrete multiple-parameter fractional Fourier transform domain. Information about the original images can only be successfully decrypted given the possession of all correct keys. The parameters of chaotic pixel scrambling for the proposed method enlarge the key space. Moreover, the proposed method solves the crosstalk problem of multiple images and improves the multiplexing capacity. Numerical simulations demonstrate the effectiveness of the proposed method.
Źródło:
Optica Applicata; 2021, 51, 1; 121-134
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
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