scholarly journals Optimal quench for distance-independent entanglement and maximal block entropy

2014 ◽  
Vol 90 (4) ◽  
Author(s):  
Bedoor Alkurtass ◽  
Leonardo Banchi ◽  
Sougato Bose
Keyword(s):  
Block Entropy ◽  
Maximal Block

scholarly journals Voltage-dependent block of endothelial volume-regulated anion channels by calix[4]arenes

1998 ◽  
Vol 275 (3) ◽  
pp. C646-C652 ◽  
Author(s):  
Guy Droogmans ◽  
Jean Prenen ◽  
Jan Eggermont ◽  
Thomas Voets ◽  
Bernd Nilius
Keyword(s):  
Open Channel ◽  
Single Channel ◽  
Anion Channel ◽  
Anion Channels ◽  
Channel Conductance ◽  
Open Channel Block ◽  
Maximum Inhibition ◽  
Voltage Dependent ◽  
A Site ◽  
Maximal Block

We have studied the effects of calix[4]arenes on the volume-regulated anion channel (VRAC) currents in cultured calf pulmonary artery endothelial cells. TS- and TS-TM-calix[4]arenes induced a fast inhibition at positive potentials but were ineffective at negative potentials. Maximal block occurred at potentials between 30 and 50 mV. Lowering extracellular pH enhanced the block and shifted the maximum inhibition to more negative potentials. Current inhibition was also accompanied by an increased current noise. From the analysis of the calix[4]arene-induced noise, we obtained a single-channel conductance of 9.3 ± 2.1 pS ( n = 9) at +30 mV. The voltage- and time-dependent block were described using a model in which calix[4]arenes bind to a site at an electrical distance of 0.25 inside the channel with an affinity of 220 μM at 0 mV. Binding occludes VRAC at moderately positive potentials, but calix[4]arenes permeate the channel at more positive potentials. In conclusion, our data suggest an open-channel block of VRAC by calix[4]arenes that also depends on the protonation of the binding site within the pore.

An Adaptive JPEG Steganographic Scheme Based on the Block Entropy of DCT Coefficients

2012 ◽  
Vol 4 (2) ◽  
pp. 13-27
Author(s):  
Chang Wang ◽  
Jiangqun Ni ◽  
Chuntao Wang ◽  
Ruiyu Zhang
Keyword(s):  
Rounding Errors ◽  
Trellis Coding ◽  
Minimal Distortion ◽  
Distortion Effect ◽  
Dct Coefficients ◽  
Block Entropy ◽  
Block Complexity ◽  
Embedding Distortion ◽  
Significant Superiority

Minimizing the embedding impact is a practically feasible philosophy in designing steganographic systems. The development of steganographic systems can be formulated as the construction of distortion profile reflecting the embedding impact and the design of syndrome coding based on a certain code. The authors devise a new distortion profile exploring both the block complexity and the distortion effect due to flipping and rounding errors, and incorporate it in the framework of syndrome trellis coding (STC) to propose a new JPEG steganographic scheme. The STC provides multiple candidate solutions to embed messages to a block of coefficients while the constructed content-adaptive distortion profile guides the determination of the best solution with minimal distortion effect. The total embedding distortion or impact would be significantly reduced and lead to the less detectability of steganalysis. Extensive experimental results demonstrate that the proposed JPEG steganographic scheme greatly increases the secure embedding capacity against steganalysis and shows significant superiority over some existing JPEG steganographic approaches.

BLOCK ENTROPY ANALYSIS OF HEART RATE VARIABILITY SIGNALS

2006 ◽  
Vol 16 (07) ◽  
pp. 2093-2101 ◽  
Author(s):  
K. KARAMANOS ◽  
S. NIKOLOPOULOS ◽  
K. HIZANIDIS ◽  
G. MANIS ◽  
A. ALEXANDRIDI ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Heat Rate ◽  
Coarse Graining ◽  
Coarse Grained ◽  
Entropy Analysis ◽  
Data Set ◽  
Novel Approach ◽  
Data Files ◽  
Block Entropy ◽  
Artery Disease

In this paper we present a novel approach to the analysis of Heat Rate Variability (HRV) data, by coarse-graining analysis using the estimation of Block Entropies with the technique of lumping. HRV time series are generated from long recordings of Electrocardiograms (ECGs) and are then filtered in order to produce a coarse-grained symbolic dynamics. Block Entropy analysis is applied to these dynamics in order to examine its coarse-grained statistics. Our data set is comprised of two subsets, one of healthy subjects and another of Coronary Artery Disease (CAD) patients. It is found that Entropy analysis provides a quick and efficient tool for the differentiation of these series according to subject category. Healthy subjects provided more complex statistics compared to patients; specifically, the healthy data files provided higher values of block Entropies compared to patient ones. We also compare these results with the Correlation Dimension Estimation in order to establish coherency. We believe that this analysis may provide a useful statistical method towards the better understanding of the human cardiac system.

Dynamical complexity in Swarm electron density time series using Block entropy

2020 ◽  
Vol 131 (6) ◽  
pp. 69001
Author(s):  
G. Balasis ◽  
C. Papadimitriou ◽  
A. Z. Boutsi ◽  
I. A. Daglis ◽  
O. Giannakis ◽  
...  
Keyword(s):  
Time Series ◽  
Electron Density ◽  
Dynamical Complexity ◽  
Block Entropy

An Adaptive JPEG Steganographic Scheme Based on the Block Entropy of DCT Coefficients

2013 ◽  
pp. 77-91
Author(s):  
Chang Wang ◽  
Jiangqun Ni ◽  
Chuntao Wang ◽  
Ruiyu Zhang
Keyword(s):  
Rounding Errors ◽  
Trellis Coding ◽  
Minimal Distortion ◽  
Distortion Effect ◽  
Dct Coefficients ◽  
Block Entropy ◽  
Block Complexity ◽  
Embedding Distortion ◽  
Significant Superiority

Minimizing the embedding impact is a practically feasible philosophy in designing steganographic systems. The development of steganographic systems can be formulated as the construction of distortion profile reflecting the embedding impact and the design of syndrome coding based on a certain code. The authors devise a new distortion profile exploring both the block complexity and the distortion effect due to flipping and rounding errors, and incorporate it in the framework of syndrome trellis coding (STC) to propose a new JPEG steganographic scheme. The STC provides multiple candidate solutions to embed messages to a block of coefficients while the constructed content-adaptive distortion profile guides the determination of the best solution with minimal distortion effect. The total embedding distortion or impact would be significantly reduced and lead to the less detectability of steganalysis. Extensive experimental results demonstrate that the proposed JPEG steganographic scheme greatly increases the secure embedding capacity against steganalysis and shows significant superiority over some existing JPEG steganographic approaches.

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