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2522. Asymptotically stable multi-valued many-to-many associative memory neural network and its application in image retrieval
- Creator:
- Chen , Lei, Yang , Geng, Zhang, Yingzhou, Wang , Chuandong, and Yang, Zhen
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Artificial neural network, associative memory model, asymptotical stability, similarity metric, and association-based image retrieval
- Language:
- English
- Description:
- As an important artificial neural network, associative memory model can be employed to mimic human thinking and machine intelligence. In this paper, first, a multi-valued many-to-many Gaussian associative memory model (M3GAM) is proposed by introducing the Gaussian unidirectional associative memory model (GUAM) and Gaussian bidirectional associative memory model (GBAM) into Hattori {et al}'s multi-module associative memory model ((MMA)2). Second, the M3GAM's asymptotical stability is proved theoretically in both synchronous and asynchronous update modes, which ensures that the stored patterns become the M3GAM's stable points. Third, by substituting the general similarity metric for the negative squared Euclidean distance in M3GAM, the generalized multi-valued many-to-many Gaussian associative memory model (GM3GAM) is presented, which makes the M3GAM become its special case. Finally, we investigate the M3GAM's application in association-based image retrieval, and the computer simulation results verify the M3GAM's robust performance.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2523. Asymptotická struktura prostoročasů s kosmologickou konstantou
- Creator:
- Krtouš, Pavel and Podolský, Jiří
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- teoretická fyzika, časoprostor, fyzikální kosmologie, theoretical physics, space and time, physical cosmology, 6, and 53
- Language:
- Czech
- Description:
- Pavel Krtouš, Jiří Podolský. and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
2524. Asymptotická volnost: od paradoxu k paradigmatu
- Creator:
- Wilczek, Frank A. and Gregora, Ivan
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- teoretická fyzika, Nobelova cena (ocenění), paradigma vědy, theoretical physics, Nobel Prizes, paradigma of science, 6, and 53
- Language:
- Czech
- Description:
- Frank A. Wilczek ; přeložil Ivan Gregora. and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
2525. Asymptotics for weakly dependent errors in-variables
- Creator:
- Pešta, Michal
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- errors-in-variables (EIV), dependent errors, total leasts squares (TLS), and asymptotic normality
- Language:
- English
- Description:
- Linear relations, containing measurement errors in input and output data, are taken into account in this paper. Parameters of these so-called \emph{errors-in-variables} (EIV) models can be estimated by minimizing the \emph{total least squares} (TLS) of the input-output disturbances. Such an estimate is highly non-linear. Moreover in some realistic situations, the errors cannot be considered as independent by nature. \emph{Weakly dependent} (α- and φ-mixing) disturbances, which are not necessarily stationary nor identically distributed, are considered in the EIV model. Asymptotic normality of the TLS estimate is proved under some reasonable stochastic assumptions on the errors. Derived asymptotic properties provide necessary basis for the validity of block-bootstrap procedures.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2526. Asymptotics of variance of the lattice point count
- Creator:
- Janáček, Jiří
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- point lattice, Fourier transform, volume, and variance
- Language:
- English
- Description:
- The variance of the number of lattice points inside the dilated bounded set $rD$ with random position in $\Bbb R^d$ has asymptotics $\sim r^{d-1}$ if the rotational average of the squared modulus of the Fourier transform of the set is $O(\rho ^{-d-1})$. The asymptotics follow from Wiener's Tauberian theorem.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2527. Asynchronous sampling-based leader-following consensus in second-order multi-agent systems
- Creator:
- Wang, Zhengxin, Feng, Yuanzhen, Zheng, Cong, Lu, Yanling, and Pan, Lijun
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- leader-following, multi-agent systems, consensus, and asynchronous sampling
- Language:
- English
- Description:
- This paper studies the leader-following consensus problem of second-order multi-agent systems with directed topologies. By employing the asynchronous sampled-data protocols, sufficient conditions for leader-following consensus with both constant velocity leader and variable velocity leader are derived. {Leader-following quasi-consensus can be achieved in multi-agent systems when all the agents sample the information asynchronously.} Numerical simulations are provided to verify the theoretical results.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2528. Atherogenic impact of lecithin-cholesterol acyltransferase and its relation to cholesterol esterification rate in HDL (FERHDL) and AIP [log(TG/HDL-C)] biomarkers: the butterfly effect?
- Creator:
- Milada Dobiášová
- Format:
- print, bez média, and svazek
- Type:
- article, články, journal articles, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, ateroskleróza, atherosclerosis, lecithin-cholesterol acyltransferase (LCAT), FERHDL (fractional esterification rate in HDL), AIP (atherogenic index of plasma, log(TG/HDL-C), biomarkers of cardiometabolic risk, lipoprotein particle size, 14, and 612
- Language:
- English
- Description:
- The atherogenic impact and functional capacity of LCAT was studied and discussed over a half century. This review aims to clarify the key points that may affect the final decision on whether LCAT is an anti-atherogenic or atherogenic factor. There are three main processes involving the efflux of free cholesterol from peripheral cells, LCAT action in intravascular pool where cholesterol esterification rate is under the control of HDL, LDL and VLDL subpopulations, and finally the destination of newly produced cholesteryl esters either to the catabolism in liver or to a futile cycle with apoB lipoproteins. The functionality of LCAT substantially depends on its mass together with the composition of the phospholipid bilayer as well as the saturation and the length of fatty acyls and other effectors about which we know yet nothing. Over the years, LCAT puzzle has been significantly supplemented but yet not so satisfactory as to enable how to manipulate LCAT in order to prevent cardiometabolic events. It reminds the butterfly effect when only a moderate change in the process of transformation free cholesterol to cholesteryl esters may cause a crucial turn in the intended target. On the other hand, two biomarkers - FERHDL (fractional esterification rate in HDL) and AIP [log(TG/HDL-C)] can offer a benefit to identify the risk of cardiovascular disease (CVD). They both reflect the rate of cholesterol esterification by LCAT and the composition of lipoprotein subpopulations that controls this rate. In clinical practice, AIP can be calculated from the routine lipid profile with help of AIP calculator www.biomed.cas.cz/fgu/aip/calculator.php., M. Dobiášová., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2529. Atherogenic lipoprotein profile in families with and without history of early myocardial infarction
- Creator:
- Milada Dobiášová, Katarína Rašlová, Hana Rauchová, Branislav Vohnout, Kateřina Ptáčková, and Jiří Frohlich
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, ateroskleróza, atherosclerosis, cholesterol esterification rate (FERHDL), spouses, offspring, log (TG/HDL cholesterol), 14, and 612
- Language:
- English
- Description:
- a1_In this study we compared several parameters characterizing differences in the lipoprotein profile between members of families with a positive or negative family history of coronary artery disease (CAD). In addition to regular parameters such as the body mass index (BMI), total plasma cholesterol (TC), low density (LDL-C) and high density (HDL-C) cholesterol and triglycerides (TG) we estimated the fractional esterification rate of cholesterol in apoB lipoprotein-depleted plasma (FERHDL) which reflects HDL and LDL particle size distribution. A prevalence of smaller particles for the atherogenic profile of plasma lipoproteins is typical. Log (TG/HDL-C) as a newly established atherogenic index of plasma (AIP) was calculated and correlated with other parameters. The cohort in the study consisted of 29 young (< 54 years old) male survivors of myocardial infarction (MI), their spouses and at least one offspring (MI group; n=116). The control group consisted of 29 apparently healthy men with no family history of premature CAD in three generations, their spouses and at least one offspring (control group; n=124). MI families had significantly higher BMI than the controls, with the exception of spouses. Plasma TC did not significantly differ between MI and the controls. MI spouses had significantly higher TG. Higher LDL-C had MI survivors only, while lower HDL-C had both MI survivors and their spouses compared to the controls. FERHDL was significantly higher in all the MI subgroups (probands 25.85±1.22, spouses 21.55±2.05, their daughters 16.93±1.18 and sons 19.05±1.33 %/h) compared to their respective controls (men 20.80±1.52, spouses 14.70±0.98, daughters 13.23±0.74, sons 15.7±0.76 %/h, p<0.01 to p<0.05). Log (TG/HDL-C) ranged from negative values in control subjects to positive values in MI probands., a2_High correlation between FERHDL and Log (TG/HDL-C) (r = 0.80, p<0.0001) confirmed close interactions among TG, HDL-C and cholesterol esterification rate. The finding of significantly higher values of FERHDL and Log (TG/HDL-C) indicate higher incidence of atherogenic lipoprotein phenotype in members of MI families. The possibility that, in addition to genetic factors, a shared environment likely contributes to the familial aggregation of CAD risk factors is supported by a significant correlation of the FERHDL values within spousal pairs (control pairs: r = 0.51 p<0.01, MI pairs: r = 0.41 p<0.05)., M. Dobiášová, K. Rašlová,H. Rauchová, B. Vohnout, K. Ptáčková, J. Frohlich., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
2530. Atherosclerosis - so well-known and still mysterious
- Creator:
- Michal Vrablík
- Format:
- print, bez média, and svazek
- Type:
- article, zprávy, reports, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, ateroskleróza, atherosclerosis, 14, and 612
- Language:
- English
- Description:
- M. Vráblík.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public