The Experts below are selected from a list of 8271 Experts worldwide ranked by ideXlab platform
Vitaly Kober - One of the best experts on this subject based on the ideXlab platform.
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Fast Hopping Discrete Sine Transform
'Institute of Electrical and Electronics Engineers (IEEE)', 2021Co-Authors: Vitaly KoberAbstract:Discrete sine transform (DST) is widely used in digital signal processing such as image coding, spectral analysis, feature extraction, and filtering. This is because the discrete sine transform is close to the optimal Karhunen–Loeve transform for first-order Markov stationary signals with low correlation coefficients. Short-time (hopping) discrete sine transform can be employed for time-frequency analysis and adaptive processing quasi-stationary data such as speech, biomedical, radar and communication signals. Hopping transform refers to a transform computed on the signal of a fixed-size window that slides over the signal with an integer hop step. In this paper, we first derive a second-order Recursive equation between DST spectra in equidistant signal windows, and then propose two fast algorithms for computing the hopping DST based on the Recursive Relationship and input-pruned DST algorithm. The performance of the proposed algorithms with respect to computational costs and execution time is compared with that of conventional sliding and fast DST algorithms. The computational complexity of the developed algorithms is lower than any of the existing algorithms, resulting in significant time savings
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fast algorithms for the computation of sliding discrete sinusoidal transforms
IEEE Transactions on Signal Processing, 2004Co-Authors: Vitaly KoberAbstract:Fast algorithms for computing various discrete cosine transforms and discrete sine transforms in a sliding window are proposed. The algorithms are based on a Recursive Relationship between three subsequent local transform spectra. Efficient inverse algorithms for signal processing in a sliding window are also presented. The computational complexity of the algorithms is compared with that of known fast discrete sinusoidal transforms and running Recursive algorithms.
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Fast Recursive algorithm for sliding discrete sine transform
Electronics Letters, 2002Co-Authors: Vitaly KoberAbstract:A fast algorithm for computing the sliding discrete sine transform (DST) is proposed. The algorithm is based on a Recursive Relationship between three subsequent local DST spectra. The computational complexity of the algorithm is compared with that of fast DST algorithms.
Noelia Ibanezescriche - One of the best experts on this subject based on the ideXlab platform.
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a cross specific multiplicative binomial Recursive model for the analysis of perinatal mortality in a diallel cross among three varieties of iberian pig
Scientific Reports, 2020Co-Authors: L Varona, Jose Luis Noguera, J Casellas, Melani Martin De Hijas, Juan Pablo Rosas, Noelia IbanezescricheAbstract:Perinatal piglet mortality is an important factor in pig production from economic and animal welfare perspectives; however, the statistical analysis of mortality is difficult because of its categorical nature. Recent studies have suggested that a binomial model for the survival of each specific piglet with a logit approach is appropriate and that Recursive Relationships between traits are useful for taking into account non-genetic Relationships with other traits. In this study, the Recursive binomial model is expanded in two directions: (1) the Recursive phenotypic dependence among traits is allowed to vary among groups of individuals or crosses, and (2) the binomial distribution is replaced by the multiplicative binomial distribution to account for over or underdispersion. In this study, five Recursive multiplicative binomial models were used to obtain estimates of the Dickerson crossbreeding parameters in a diallel cross among three varieties of Iberian pigs [Entrepelado (EE), Torbiscal (TT), and Retinto (RR)]. Records (10,255) from 2110 sows were distributed as follows: EE (433 records, 100 sows), ER (2336, 527), ET (942, 177), RE (806, 196), RR (870, 175), RT (2450, 488), TE (193, 36), TR (1993, 359), and TT (232, 68). Average litter size [Total Number Born (TNB)] and number of stillborns (SB) were 8.46 ± 2.27 and 0.25 ± 0.72, respectively. The overdispersion was evident with all models. The model with the best fit included a linear Recursive Relationship between TNB and the logit of [Formula: see text] of the multiplicative binomial distribution, and it implies that piglet mortality increases with litter size. Estimates of direct effects showed small differences among populations. The analysis of maternal effects indicated that the dams whose mothers were EE had a larger SB, while dams with RR mothers reduced the probability of born dead. The posterior estimates of heterosis suggested a reduction in SB when the sow is crosbred. The multiplicative binomial distribution provides a useful alternative to the binomial distribution when there is overdispersion in the data. Recursive models can be used for modeling non-genetic Relationships between traits, even if the phenotypic dependency between traits varies among environments or groups of individuals. Piglet perinatal mortality increased with TNB and is reduced by maternal heterosis.
Yannick Griep - One of the best experts on this subject based on the ideXlab platform.
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reciprocal effects of psychological contract breach on counterproductive and organizational citizenship behaviors the role of time
Journal of Vocational Behavior, 2018Co-Authors: Yannick Griep, Tim VantilborghAbstract:Abstract The purpose of this study was to investigate the dynamic Relationship between psychological contract (PC) breach, violation feelings, and acts of counterproductive work (CWBs) and organizational citizenship (OCBs) behavior, as well as to investigate the reverse Relationship from CWB and OCB to PC breach. We tested these direct and reverse Relationships by means of structural equation modeling using latent growth parameters on weekly survey data from 80 respondents for 10 consecutive weeks (516 observations). Our results revealed that an accumulation of PC breach over the course of 10 weeks was positively associated with intensifying violation feelings, which in turn was positively associated with the enactment of an increasing number of CWB-O acts over time. However, we did not find such a Relationship for the enactment of OCB-O acts over time. Moreover, we found that both static and increasing numbers of OCB-O and CWB-O acts were negatively and positively related to static and accumulating perceptions of PC breach, respectively. This study challenges the static treatment of PC breach and its reactions, as well as the often assumed negative PC breach-OCB-O Relationship. In addition, this study demonstrates a Recursive Relationship between PC breach and OCB-O and CWB-O.
John N Haddad - One of the best experts on this subject based on the ideXlab platform.
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on the closed form of the covariance matrix and its inverse of the causal arma process
2004Co-Authors: John N HaddadAbstract:Derivation of the theoretical autocovariance function of a causal autoregressive moving-average process of order (p,q), ARMA(p,q), when q greater than or equal to 1 is considered. A Recursive Relationship is established between the covariance matrices of an ARMA(p,q) process and its associated ARMA(p,q-1) process. The obtained recursion is shown to produce the inverse of the covariance matrix and its determinant. Moreover, the introduced method can be easily implemented in any programming environment.
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the Recursive property of the inverse of the covariance matrix of a moving average process of general order
Journal of Time Series Analysis, 1995Co-Authors: John N HaddadAbstract:. The inverse of the covariance matrix of a moving-average process of general order is considered. A Recursive Relationship between the inverses for any two consecutive orders has been established. Illustrative situations are derived and exact expressions are discussed.
Frances Cleaver - One of the best experts on this subject based on the ideXlab platform.
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paradoxes of participation questioning participatory approaches to development
Journal of International Development, 1999Co-Authors: Frances CleaverAbstract:This article suggests that the concepts underlying participatory approaches to development should be subject to greater critical analysis. Drawing on research on water resource management in sub-Saharan Africa, and on social theory concerning the Recursive Relationship between agency and structure, it illustrates the need for a more complex understanding of issues of efficiency and empowerment in participatory approaches. Particularly, two key concepts are examined: ideas about the nature and role of institutions ; and models of individual action . The article concludes by identifying the questions such an analysis raises about the Relationships between community, social capital and the state. Copyright © 1999 John Wiley & Sons, Ltd.
