Comparison Criteria for Parallel Orderings in ILU Preconditioning

2005 ◽  
Vol 26 (4) ◽  
pp. 1234-1260 ◽  
Author(s):  
Takeshi Iwashita ◽  
Yuuichi Nakanishi ◽  
Masaaki Shimasaki
Keyword(s):  
Comparison Criteria ◽  
Ilu Preconditioning

RESEARCH OF THE ISSUES OF IMPROVEMENT OF PROTECTION SYSTEMS AGAINST DDOS-ATTACKS BASED ON THE COMPREHENSIVE ANALYSIS OF MODERN INTERACTION MECHANISMS

2021 ◽  
Vol 53 (1) ◽  
pp. 63-74
Author(s):  
DMITRIY A. BACHMANOV ◽  
◽  
ANDREY R. OCHEREDKO ◽  
MICHAEL M. PUTYATO ◽  
ALEXANDER S. MAKARYAN ◽  
...  
Keyword(s):  
Denial Of Service ◽  
Comprehensive Analysis ◽  
Cyber Attacks ◽  
Ddos Attacks ◽  
Network Resources ◽  
Combined Use ◽  
Service Type ◽  
Protection Systems ◽  
Comparison Criteria

The article presents the results of an analysis of the growth in the development of botnet networks and new cyber threats when they are used by cybercriminals. A review and comparison of the models for the implementation of botnet networks is carried out, as a result of which there are two main types. The main types of attacks carried out using the infrastructure of distributed computer networks are identified and classified, formed into 7 main groups, taking into account the relevance, prevalence and amount of damage. Based on the results of the analysis, it was determined that the most widespread and relevant type of attack is “Denial of Service”. The article presents a classification of services that provide services to ensure the protection of network resources from distributed attacks by the "Denial of Service" type, by the type of deployment, the level of security and the types of services provided. The comparison criteria are given taking into account their infrastructure, availability of technical support and a test period, available types of protection, capabilities, additional options, notification and reporting, as well as licensing. Practically implemented and shown a way to integrate the DDoS-Guard Protection service with an additional module at the application level, which made it possible to expand the methods of protection against DDoS attacks. Various modifications of the combined use of the module and the modified system make it possible to increase the expected level of detection and prevention of cyber - attacks.

Performance Ranking of Plate-Fin Heat Exchanger Surfaces

1978 ◽  
Vol 100 (3) ◽  
pp. 514-519 ◽  
Author(s):  
J. G. Soland ◽  
W. M. Mack ◽  
W. M. Rohsenow
Keyword(s):  
Heat Exchanger ◽  
Simplified Analysis ◽  
Comparison Criteria ◽  
Performance Ranking

The Kays-London [4] way of presenting heat exchanger performance is modified to use the data in the simplified analysis of La Haye, et al. [5] which was extended to permit the ready comparison of the performance of the various plate-fin surfaces. Based on the four comparison criteria considered, the wavy finned 17.8–3/8 W surface of Kays-London is the best.

Thermophysical property-related comparison criteria for nanofluid heat transfer enhancement in turbulent flow

2010 ◽  
Vol 96 (21) ◽  
pp. 213109 ◽  
Author(s):  
W. Yu ◽  
D. M. France ◽  
E. V. Timofeeva ◽  
D. Singh ◽  
J. L. Routbort
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Heat Transfer Enhancement ◽  
Thermophysical Property ◽  
Transfer Enhancement ◽  
Comparison Criteria

scholarly journals Numerical Solution of Diffusion Models in Biomedical Imaging on Multicore Processors

2011 ◽  
Vol 2011 ◽  
pp. 1-16 ◽  
Author(s):  
Luisa D'Amore ◽  
Daniela Casaburi ◽  
Livia Marcellino ◽  
Almerico Murli
Keyword(s):  
Image Analysis ◽  
Parallel Computing ◽  
Multicore Processors ◽  
Nonlinear Partial Differential Equations ◽  
Numerical Algorithms ◽  
Computing Environment ◽  
Fully Implicit ◽  
Discretization Schemes ◽  
Comparison Criteria

In this paper, we consider nonlinear partial differential equations (PDEs) of diffusion/advection type underlying most problems in image analysis. As case study, we address the segmentation of medical structures. We perform a comparative study of numerical algorithms arising from using the semi-implicit and the fully implicit discretization schemes. Comparison criteria take into account both the accuracy and the efficiency of the algorithms. As measure of accuracy, we consider the Hausdorff distance and the residuals of numerical solvers, while as measure of efficiency we consider convergence history, execution time, speedup, and parallel efficiency. This analysis is carried out in a multicore-based parallel computing environment.

scholarly journals Compressibility effects for the AGARD-B model

2015 ◽  
Vol 119 (1214) ◽  
pp. 543-552
Author(s):  
S. Tuling ◽  
B. Vallabh ◽  
M.F. Morelli
Keyword(s):  
Delta Wing ◽  
Numerical Study ◽  
Turbulence Models ◽  
Secondary Vortex ◽  
Flow Topology ◽  
Ansys Fluent ◽  
Shock Region ◽  
Vortex Separation ◽  
Comparison Criteria ◽  
Compressibility Effects

AbstractA numerical study of the flow topologies over the 60° delta wing of the AGARD-B model at Mach 0·80 has revealed that vortex bursting occurs between 13°-15° angle-of-attack, while vortex separation occurs above 18°. These aerodynamic features have been identified as additional comparison criteria which need to be replicated for facilities using the model for calibration or inter-tunnel comparison purposes. The numerical simulations were performed using ANSYS Fluent V13, a structured mesh with near wall treatment and the Spalart-Allmaras and κ-ω SST turbulence models, and validated experimentally in a 5′ × 5′ transonic facility. Other aspects not previously identified or studied are firstly a recovery shock between the primary and secondary vortex that exists only when vortex bursting occurs, and secondly the lack of a shock between the wing and vortex when the flow topology corresponds to the centreline shock region as observed in other studies.

Sign in / Sign up

Export Citation Format

Share Document