IT and cyber warfare (encryption and data security, penetration and disruption in information networks, radars, dealing with hackers, etc.)
Reza Tarighi; Mohammad hosein Khalesi; mohammad hosein kazemi
Volume 2, Issue 3 , January 2024, , Pages 16-37
Abstract
The Kalman filter is a set of mathematical equations that is a computationally efficient tool for estimation. It provides us with the process status, in this way, it minimizes the mean square error. In some applications, this filter is very strong, it supports the past situation as well as the present ...
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The Kalman filter is a set of mathematical equations that is a computationally efficient tool for estimation. It provides us with the process status, in this way, it minimizes the mean square error. In some applications, this filter is very strong, it supports the past situation as well as the present and future situation. This mode is accurate for when the system model is also uncertain. The Kalman filter guides general problems trying to estimate the state x so that the discrete-time process is linearly controlled by a stochastic differential equation. The purpose of this article is to correctly track the target used in a radar with the help of the Kalman filter technique and MATLAB. The result of the implementation has been analyzed and planned for flight system maneuvers using a simulated target.
Advanced materials (nano materials, absorbents, adhesives, lubricants, fire retardants, etc.)
Hamidreza Hatami; Nader Ghobadi; Dariush mehrparvar; Mohammad Farokhzadi
Volume 2, Issue 4 , December 2024, , Pages 1-15
Abstract
In this work, an attempt was made to prepare thin layers of nanostructured cadmium selenide (CdSe) based on a simple solution method of chemical bath deposition (CBD), which commercially has an accessible precursor. In the chemical solution bath layering method, manufacturing factors play a significant ...
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In this work, an attempt was made to prepare thin layers of nanostructured cadmium selenide (CdSe) based on a simple solution method of chemical bath deposition (CBD), which commercially has an accessible precursor. In the chemical solution bath layering method, manufacturing factors play a significant role and determine the characteristics of the final product. In this research, the effect of an important factor, the concentration of primary solutions of selenium and cadmium ions, which is one of the most important factors in the formation of cadmium selenide, and it will be observed that the change in the concentration of these metal and non-metal ions strongly affects the type of electronic structure of the material. In comparison with the sputtering methods, in the chemical solution deposition method, there is a high control in the formation of solid deposits with different combinations of metal and non-metal binary compounds. Changing the selenide ionconcentration changes the size of the energy band gap. It has been observed that the energy gap increases with the increase of selenide non-metal ion concentration.
Defense mechanics/navigation/control/...
sariyeh Moghtader Arbat sofla; A.H. Mazinan; M.J Mahmoodabadi
Volume 3, Issue 1 , May 2024, , Pages 48-65
Abstract
In recent years, due to the widespread use of nonlinear under-actuated systems, many efforts have been made to design a controller compatible with these systems. In fact, the defect in stimulation is done in order to reduce the number of system acctuators, in order to lighten the mechanism and reduce ...
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In recent years, due to the widespread use of nonlinear under-actuated systems, many efforts have been made to design a controller compatible with these systems. In fact, the defect in stimulation is done in order to reduce the number of system acctuators, in order to lighten the mechanism and reduce the cost of production. Such applications require a high degree of precision and innovation in control and sustainability.This paper proposes an optimal adaptive control method for the stabilization of under-actuated fourth-order balls and beam system, which is a classical example of inherently unstable systems. The basic structure for this controller is the feedback linearization (FBL) technique, while a sliding surface is applied using the sliding mod along with an adaptive method to calculate the interest coefficients. In addition, the control coefficients are optimized using the hummingbird algorithm by considering two opposing objective functions. Finally, the effectiveness of the proposed method for controlling the nonlinear ball and beam system is investigated. The results of the simulations show the high efficiency of the proposed method compared to similar works.
Maintenance and repair of the engine, wing and body of unmanned aerial vehicles/technology/construction/...
davood moosavian; Morteza Ahmadi Nohedani
Volume 3, Issue 1 , May 2024, , Pages 1-18
Abstract
A new method for cooling the combustion chamber walls, it is cooled by the bidirectional vortex Flow. Combustion stability, reducing the temperature of the combustion chamber walls and reduces losses and increase efficiency and uniformity are the properties of the vortex combustion engine. In similar ...
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A new method for cooling the combustion chamber walls, it is cooled by the bidirectional vortex Flow. Combustion stability, reducing the temperature of the combustion chamber walls and reduces losses and increase efficiency and uniformity are the properties of the vortex combustion engine. In similar circumstances the volume of flame the vortex engine is greater than the volume of flame at common axial engine. However; temperature of the Wall of the combustion chamber of the vortex engines less than temperature of the Wall of the combustion chamber of the engine Axial. Because cooled by the external vortex. In this study, was carried out Simulation and Numerical Solution the combustion chamber a special vortex engine in conditions single phase gaseous to fuel hydrogen and oxidant oxygen and assuming incompressible flow and irrespective of effect nozzle In order to simplify for review conditions governing on flow the combustion chamber. Examination of the streamlines shows a forced vortex in the center of the core and a free vortex around the core. The simulation results show that the pitch of the Stream lines near the roof is very small and the intensity of the flow rotation is high, which causes the maximum mixing of fuel and oxidizer. The flame is surrounded by an external vortex. In the simulated chamber, by increasing the distance from the edge of the stairs to the ceiling, the mixing and combustion will increase, and as a result, we will have an increase in the temperature of the wall.
Other related fields
majid zarie; Ali Jahed Saravani; Farhad Sadeghi Almaloo; Javad Ranjbar
Volume 2, Issue 3 , January 2024, , Pages 1-15
Abstract
In this article, a contrast enhancement algorithm using wavelet transform is proposed to create natural enhancement in images with various brightness ranges. In the proposed method, the input image is first decomposed into 4 sub-bands by discrete wavelet transformation. Then, in the LL sub band image, ...
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In this article, a contrast enhancement algorithm using wavelet transform is proposed to create natural enhancement in images with various brightness ranges. In the proposed method, the input image is first decomposed into 4 sub-bands by discrete wavelet transformation. Then, in the LL sub band image, the histogram cutting process is performed by the cutting threshold level equal to the average intensities. Next, the cut histogram based on entropy is divided into three parts with approximately equal number of pixels, and before equalization process, each sub-histogram is mapped to the new dynamic range. Finally, we use the inverse discrete wavelet transform to create an improved image. By controlling the enhancement ratio, the proposed method produces an image with maximum details and natural enhancement in the output image. Comparing the performance of the proposed method with previously presented methods, in terms of entropy as well as visual quality based on the mean opinion score, shows the superiority of the proposed algorithm.
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