Ventricular beat classifier using fractal number clustering

1992 ◽  
Vol 30 (5) ◽  
pp. 495-502 ◽  
Author(s):  
H. Bakardjian
Keyword(s):  
Ventricular Beat ◽  
Fractal Number

scholarly journals 174: Premature ventricular beat-induced cardiomyopathy Characteristics and prognosis after radio-frequency ablation

2013 ◽  
Vol 5 (1) ◽  
pp. 57
Author(s):  
Marie Sadron ◽  
Alexandre Duparc ◽  
Pierre Mondoly ◽  
Anne Rollin ◽  
Marc Delay ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Ablation ◽  
Premature Ventricular Beat ◽  
Ventricular Beat

scholarly journals Acute Myocardial Infarction Revealed in an Isolated Premature Ventricular Beat

Circulation ◽  
1958 ◽  
Vol 18 (5) ◽  
pp. 897-901 ◽  
Author(s):  
KERMIT H. KATZ ◽  
MORTON S. BERK ◽  
CHAIM I. MAYMAN
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Premature Ventricular Beat ◽  
Ventricular Beat

Ventricular coupling induced by anodal or cathodal polarization during continuous direct currents in dog ventricle

1958 ◽  
Vol 196 (1) ◽  
pp. 209-212 ◽  
Author(s):  
Sheppard M. Walker
Keyword(s):  
Direct Current ◽  
Vagal Stimulation ◽  
Ectopic Beat ◽  
T Wave ◽  
Sinus Rate ◽  
St Segment ◽  
Pr Interval ◽  
Ectopic Beats ◽  
Ventricular Beat

Ventricular ectopic beats coupled with preceding normal beats occur during the delivery of direct current when the anode or cathode is on the ventricular epicardium of the dog. These ectopic beats are induced within the T-wave or immediately thereafter during the application of threshold direct current when the anode is on the epicardium. When anodal current is begun in the ST segment of a given cycle, an ectopic beat is induced within or near the T-wave of the same cycle. When the cathode is on the epicardium, coupled ventricular ectopic beats are induced within the PR interval during the application of threshold direct current. Under these conditions marked slowing of sinus rate by vagal stimulation does not alter the interval of coupling between the ectopic beat and the preceding normal beat. Thus it is shown that the abnormal ventricular beat, falling within the PR interval, is ectopic and independent of the auricular impulse.

scholarly journals Ventricular beat detection in single channel electrocardiograms

2004 ◽  
Vol 3 (1) ◽  
Author(s):  
Ivan A Dotsinsky ◽  
Todor V Stoyanov
Keyword(s):  
Single Channel ◽  
Beat Detection ◽  
Ventricular Beat

Stereological Estimation of Fractal Number of Fracture Planes in Concrete

1995 ◽  
Vol 407 ◽  
Author(s):  
P. Stroeven
Keyword(s):  
Process Zone ◽  
Single Fracture ◽  
Fractal Nature ◽  
Direct Tension ◽  
Fracture Surfaces ◽  
Fracture Planes ◽  
Loading Direction ◽  
Chain Link ◽  
Particulate Filler ◽  
Fractal Number

ABSTRACTConcrete is a man-made material containing a particulate filler designed on the basis of a sieve curve. In case of river aggregate, the particles are approximately spherical and smoothtextured. The particle-matrix interface is mostly the weakest chain link in the mechanical system. This implies damage evolution to start at particle-matrix interfaces. In case of direct tension, these interface cracks will be on average perpendicular to the loading direction. In case of direct compression, they will be parallel to the loading direction. A single fracture surface is formed in tension and a series of fracture surfaces in compression. They are the result of crack concentration within a process zone, in which the engineering crack closely meanders around a dividing plane. This allows to model these fracture surfaces on different resolution levels. It is shown, using stereological notions, that the very phenomenon is of a non-ideal fractal nature. Estimates for fractal dimension of fracture surfaces in concretes based on sieve curves at the border of the practical range are found to closely match experimental data reported in the literature.

Fractal Dimensions in Elastic-Plastic Beam Dynamics

1995 ◽  
Vol 62 (2) ◽  
pp. 523-526 ◽  
Author(s):  
P. S. Symonds ◽  
J.-Y. Lee
Keyword(s):  
Short Pulse ◽  
Fractal Dimensions ◽  
Pulse Loading ◽  
Load Parameter ◽  
Beam Model ◽  
Self Similarity ◽  
Elastic Plastic ◽  
Intersection Points ◽  
Two Degree Of Freedom ◽  
Fractal Number

Calculations of two types of fractal dimension are reported, regarding the elastic-plastic response of a two-degree-of-freedom beam model to short pulse loading. The first is Mandelbrot’s (1982) self-similarity dimension, expressing independence of scale of a figure showing the final displacement as function of the force in the pulse loading; these calculations were made with light damping. These results are equivalent to a microscopic examination in which the magnification is increased by factors of 102; 104; and 106. It is found that the proportion and distribution of negative final displacements remain nearly constant, independent of magnification. This illustrates the essentially unlimited sensitivity to the load parameter, and implies that the final displacement in this range of parameters is unpredictable. The second fractal number is the correlation dimension of Grassberger and Procaccia (1983), derived from plots of Poincare intersection points of solution trajectories computed for the undamped model. This fractional number for strongly chaotic cases underlies the random and discontinuous selection by the solution trajectory of the potential well leading to the final rest state, in the case of the lightly damped model.

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