RESUMEN
This paper applies the entropy-based fractal indexing scheme that enables the grid environment for fast indexing and querying. It addresses the issue of fault tolerance and load balancing-based fractal management to make computational grids more effective and reliable. A fractal dimension of a cloud of points gives an estimate of the intrinsic dimensionality of the data in that space. The main drawback of this technique is the long computing time. The main contribution of the suggested work is to investigate the effect of fractal transform by adding R-tree index structure-based entropy to existing grid computing models to obtain a balanced infrastructure with minimal fault. In this regard, the presented work is going to extend the commonly scheduling algorithms that are built based on the physical grid structure to a reduced logical network. The objective of this logical network is to reduce the searching in the grid paths according to arrival time rate and path's bandwidth with respect to load balance and fault tolerance, respectively. Furthermore, an optimization searching technique is utilized to enhance the grid performance by investigating the optimum number of nodes extracted from the logical grid. The experimental results indicated that the proposed model has better execution time, throughput, makespan, latency, load balancing, and success rate.
RESUMEN
AIM: Balloon aortic valvuloplasty (BAV) has reemerged with transcatheter valve therapy. Cylindrical balloons have been the device of choice despite limitations. An hour glass shaped balloon may permit enhanced fixation and broader leaflet opening without annular compromise. METHODS: We report our initial BAV experience using the V8 balloon (InterValve Inc.) in 20 consecutive patients compared to 20 patients from a 403-patient BAV database using cylindrical balloons. Patients were propensity matched on a 1:1 basis by age, gender, left ventricular ejection fraction (LVEF), baseline aortic valve area (AVA) and Society of Thoracic Surgery (STS) mortality risk score. End points included change in AVA and aortic insufficiency (AI) by echocardiography. New atrioventricular conduction defects (AVCD), need for post procedure pacemaker were documented. Major adverse events (MAE) included procedure related death, emergency surgery or stroke. RESULTS: V8 and cylindrical balloon groups were similar across age, gender, LVEF, AVA and STS score. The change in AVA from baseline to post-procedure strongly trended towards being larger in the V8 group than cylindrical balloon group (mean [SD]; 0.30±0.23 cm2 vs. 0.17±0.21 cm2; P=0.063). There were no differences in outcomes for degree of AI, AVCD, need for pacemaker or MAE. CONCLUSION: Preliminary findings in this small experience suggest an advantage for enhancing AVA when using the V8 compared with cylindrical balloons. Additionally, there was no evidence of increased AI, AVCD or MAE.
