Search

Start Over Format svazek Original context has metadata only false

2511. Asymptotic stability condition for stochastic Markovian systems of differential equations

Creator:
Shmerling, Efraim
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
jump parameter system, Markov process, and asymptotic stability
Language:
English
Description:
Asymptotic stability of the zero solution for stochastic jump parameter systems of differential equations given by dX(t) = A(ξ(t))X(t) dt + H(ξ(t))X(t) dw(t), where ξ(t) is a finite-valued Markov process and w(t) is a standard Wiener process, is considered. It is proved that the existence of a unique positive solution of the system of coupled Lyapunov matrix equations derived in the paper is a necessary asymptotic stability condition.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2512. 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

2515. 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

2516. 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

2517. 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

2518. 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

2519. 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

Limit your search

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

View distribution

Current results range from 0 to 2021

View larger »