A new approach to study the coexistence of some synchronization types between chaotic maps with different dimensions

2016 ◽  
Vol 86 (2) ◽  
pp. 1319-1328 ◽  
Author(s):  
Adel Ouannas ◽  
Giuseppe Grassi
Keyword(s):  
Chaotic Maps ◽  
New Approach ◽  
Different Dimensions

Synchronization between fractional chaotic maps with different dimensions

2022 ◽  
pp. 89-121
Author(s):  
Adel Ouannas ◽  
Amina-Aicha Khennaoui ◽  
Iqbal M. Batiha ◽  
Viet-Thanh Pham
Keyword(s):  
Chaotic Maps ◽  
Different Dimensions

New Approach of the Playfair's Cipher with A Numerical Value of the Keyword

2017 ◽  
Vol 6 (3) ◽  
pp. 695 ◽  
Author(s):  
Assia Merzoug ◽  
Adda Ali-Pacha ◽  
Naima Hadj-Said
Keyword(s):  
Chaotic Maps ◽  
Initial Conditions ◽  
Logistic Map ◽  
Academic Research ◽  
Chaotic Attractors ◽  
New Approach ◽  
Single Character ◽  
Dimension 2

<p>At least during the last five years there has been an explosion of a public academic research in cryptography for Playfair's cipher. We were interested, and we have proposed a method to improve it, to make it safer and more efficient. We have oversized this encryption matrix by 7x7 coefficents and for its filling, we have combined two chaotic maps (the attractor Henon and logistics map). The attractor Henon of dimension 2, determines the intersection of the row and column of the new matrix playfair. The coefficients of this matrix are calculated from logistic map, each value is a single character of the alphabet used. The secret keyword is formed by the initial conditions of the chaotic attractors.</p>

LABORATORY EXERCISE TO DETERMINE CONTRAST IN LASER MARKING OF ARTICLES

2019 ◽  
Vol 1 ◽  
pp. 331
Author(s):  
Lyubomir Lazov ◽  
Edmunds Teirumnieks ◽  
Erika Teirumnieka ◽  
Pavel Cacivkin ◽  
Nikolay Angelov ◽  
...  
Keyword(s):  
Optimal Process ◽  
Laser Marking ◽  
New Approach ◽  
Laser Technology ◽  
Laboratory Exercise ◽  
Innovative Methods ◽  
Modern Process ◽  
The Subject ◽  
Different Dimensions ◽  
Marked Surface

The laser marking has been established in recent years as one of the modern innovative methods for marking many industrial products. The report examines a new laboratory exercise for the subject Laser Technology, studied in some technical universities. A new approach is proposed to determine the contrast of the laser marking process. Described is the purpose and the main tasks as well as the new skills and knowledge that students can exercise through this laboratory exercise. Students implement a test matrix consisting of squares of a certain size using the raster marking method. Through the new laboratory exercise, students can explore and analyze the dependencies of the contrast of laser markings on different dimensions influencing the technological process. The capabilities of the new approach allow learners to become more familiar with the factors that influence the modern process of laser marking widely used in modern industry. The results of the experiments the students summarize using a new modern digital approach to analyze the contrast against the background of the marked surface. From the experimental graphical dependencies of the variation of the power and speed contrast, they draw conclusions about the optimal process parameters. 

scholarly journals Analysis of Scalability and Sensitivity for Chaotic Sine Cosine Algorithms

2018 ◽  
Vol 14 (2) ◽  
pp. 139-154
Author(s):  
Dunia Tahir ◽  
Ramzy Ali
Keyword(s):  
Large Scale ◽  
Chaotic Maps ◽  
Random Parameters ◽  
Initial Value ◽  
Chaotic Sequences ◽  
Large Scale Problems ◽  
Sine Cosine Algorithm ◽  
Different Dimensions ◽  
Local Solutions ◽  
Metaheuristic Optimization Algorithms

Chaotic Sine-Cosine Algorithms (CSCAs) are new metaheuristic optimization algorithms. However, Chaotic Sine-Cosine Algorithm (CSCAs) are able to manipulate the problems in the standard Sine-Cosine Algorithm (SCA) like, slow convergence rate and falling into local solutions. This manipulation is done by changing the random parameters in the standard Sine-Cosine Algorithm (SCA) with the chaotic sequences. To verify the ability of the Chaotic Sine-Cosine Algorithms (CSCAs) for solving problems with large scale problems. The behaviors of the Chaotic Sine-Cosine Algorithms (CSCAs) were studied under different dimensions 10, 30, 100, and 200. The results show the high quality solutions and the superiority of all Chaotic Sine-Cosine Algorithms (CSCAs) on the standard SCA algorithm for all selecting dimensions. Additionally, different initial values of the chaotic maps are used to study the sensitivity of Chaotic Sine-Cosine Algorithms (CSCAs). The sensitivity test reveals that the initial value 0.7 is the best option for all Chaotic Sine-Cosine Algorithms (CSCAs).

scholarly journals DETERMINING THE EFFECT OF NOZZLE GROOVE ON THE FLUID FLOW THROUGH VISCOUS 2D PLANAR FLUID

2021 ◽  
pp. 1-8
Author(s):  
Obai Younis ◽  
Reem Ahmed ◽  
Ali Hamdan ◽  
Dania Ahmed ◽  
Ali Ahmed ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Numerical Method ◽  
Surface Area ◽  
Nozzle Exit ◽  
New Approach ◽  
Numerical Stimulation ◽  
Flow Through ◽  
Different Dimensions ◽  
The One

The study aims to determine the effect of nozzle groove on fluid flow through viscous 2D planar fluid. To fulfil the study’s aim, numerical method was adopted to introduce grooves of different dimensions from the nozzle exit. The study adopts SoldWork software was used to design nozzles and introduce groove shaped nozzles, each consisting of six different designs. The nozzle base model used in this study was similar to the one used in a previous study. The procedure was performed with different pressures (8, 10, and 12 bar) at the similar firefighting nozzle. The velocities contours were predicted based on the choice of nozzle section during the numerical stimulation. The results of present study demonstrated a new approach that can be used for increasing velocity at various types of modified nozzles through grooves at different pressures and locations. For grooves, dimensions 1×1 (mm) and location 15 mm at 8 bar, 10 bar and 12 bars showed no effect on velocity as it reduces velocity by increasing surface area. The velocity increases with increasing pressure in proportion relationship. This clearly explains that the groove has no effect on velocity as it increases due to increase in pressure. This is because the groove reduces the velocity by increasing surface area. The study concludes that use of groove increases velocity of water that further improves nozzles operation.

scholarly journals Lossless 4D Medical Images Compression Using Adaptive Inter Slices Filtering

2018 ◽  
Vol 7 (4) ◽  
pp. 361
Author(s):  
Leila Belhadef ◽  
Zoulikha Mekkakia Maaza
Keyword(s):  
Wavelet Transform ◽  
Video Compression ◽  
Motion Compensation ◽  
Medical Images ◽  
Lossless Compression ◽  
Compression Rate ◽  
New Approach ◽  
Different Dimensions

<p>Recent lossless 4D medical images compression works are based on the application of techniques originated from video compression to efficiently eliminate redundancies in different dimensions of image. In this context we present a new approach of lossless 4D medical images compression which consists to application of 2D wavelet transform in spatial directions followed or not by either lifting transform or motion compensation in inter slices direction, the obtained slices are coded by 3D SPIHT. Our approach was compared with 3D SPIHT with/without motion compensation. The results show our approach offers better performance in lossless compression rate.</p>

scholarly journals Generalized Triangular Intuitionistic Fuzzy Geometric Averaging Operator for Decision Making in Engineering

2017 ◽  
Author(s):  
Daniel O. Aikhuele ◽  
Sarah Odofin
Keyword(s):  
Decision Making ◽  
Intuitionistic Fuzzy Set ◽  
Multicriteria Decision Making ◽  
Multi Criteria Decision Making ◽  
Intuitionistic Fuzzy Number ◽  
New Approach ◽  
Intuitionistic Fuzzy ◽  
Averaging Operator ◽  
Different Dimensions ◽  
Evaluation Information

Intuitionistic fuzzy set, which can be represented using the triangular intuitionistic fuzzy number (TIFN), is a more generalized platform for expressing imprecise, incomplete and inconsistent information when solving multi-criteria decision-making problems, as well as for reflecting the evaluation information exactly in different dimensions. In this paper, the TIFN has been applied for solving some multi-criteria decision-making problems by developing a new triangular intuitionistic fuzzy geometric aggregation operator, that is the generalized triangular intuitionistic fuzzy ordered weighted geometric averaging (GTIFOWGA) operator, and defining some triangular intuitionistic fuzzy geometric aggregation operators including the triangular intuitionistic fuzzy weighted geometric averaging (TIFWGA) operator, the ordered weighted geometric averaging (TIFOWGA) operator and the hybrid geometric averaging (TIFHWGA) operator. Based on these operators, a new approach for solving multicriteria decision-making problems when the weight information is fixed has been proposed. Finally, the proposed method has been compared with some similar existing computational approaches by virtue of a numerical example to verify its feasibility and rationality.

Intermediate asymptotic behaviour of fluid flows by scale–size analysis

2005 ◽  
Vol 461 (2055) ◽  
pp. 755-760 ◽  
Author(s):  
V. Bertola ◽  
E. Cafaro
Keyword(s):  
Fluid Flows ◽  
Size Analysis ◽  
Turbulent Drag Reduction ◽  
New Approach ◽  
Convective Flows ◽  
Physical Mechanisms ◽  
Scale Size ◽  
Turbulent Drag ◽  
Different Dimensions ◽  
Asymptotic Behaviours

A new approach to the estimation of intermediate asymptotic behaviours of fluid flows is presented. This method is based on a modified dimensional analysis in which fundamental quantities having well–distinguished orders of magnitude are accounted for with different dimensions. Thus, the effects of different physical mechanisms can be isolated inside dimensional equations. The new technique is applied to the analysis of heat and mass transfer correlations for convective flows, and to the interpretation of turbulent drag reduction by additives in wall–bounded flows.

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