International Journal of Circuits, Systems and Signal Processing


ISSN: 1998-4464
Volume 12, 2018

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 12, 2018


Title of the Paper: Application Support for Topographical-Geodetic Issues for Tactical and Technical Control of Artillery Fire

 

Authors: Martin Blaha, Karel Šilinger

Pages: 48-57

Abstract: This paper is focused on suggestions and recommendations for suitable guidelines for fulfilling of The sketch of topographical-geodetic connection and aiming guns through line rod in the prepared firing positions. This method belongs to the fast and accurate Aiming works into the main firing direction, and consequently the target. This paper contains table of contents and method of “The sketch of topographical-geodetic connection” fulfilling. Moreover, this article aims to clarify the issue Aiming guns through line rod and show new possibilities for their placement. Stakes are still standard placed before or after the cannon in the main direction of fire. In case it is not possible in this way to place stakes can be positioned also in another direction as described in the article. With the change in tactics deployment works in firing positions, the guns are no longer on the linear line and therefore can deploy stakes in direction and eventually left to right cannon. The paper gives the instructions for the respective commanders also use those spaces that are not typically used to Aiming guns into the line of fire through line rod. Paper explains the general principle of targeting guns by line rod, particularly for 152 mm ShKH vz.77. The paper presents problems of current Artillery communication and information system and suggests requirements of the future system.


Title of the Paper: Effect of the FWM Influence on the CWDM Signal Transmission in the Optical Transmission Media

 

Authors: Rastislav Róka, Martin Mokráň

Pages: 42-47

Abstract: This paper deals with analysis of negative influences on the optical signal transmitted in the environment of optical transmission media and is focused especially on the Four Wave Mixing (FWM) effect. The FWM is one of nonlinear effects in the optical transmission media with the strongest impact on transmitted signals utilizing a wavelength division multiplexing. Consequently, a simulation model for the appropriate CWDM optical transmission path is introduced with short descriptions of functional blocks representing technologies utilized in this specific environment. The created Simulink modeling scheme of real environmental conditions at the signal transmission using the Coarse Wavelength Division Multiplexing (CWDM) allows executing different requested analyses for advanced optical signal processing techniques. Finally, some results from the CWDM simulation are introduced for the signal transmission influenced by different negative effects in the optical transmission medium. Using the presented simulation model, it is possible analyzing transmitted optical signals with eye diagrams and determined the impact of negative influences on the optical frequency spectrum.


Title of the Paper: A Performance Evaluation of Color Constancy Methods Based on Illumination Estimation

 

Authors: Chunxiao Li, Jiangming Kan

Pages: 35-41

Abstract: There are many color constancy methods based on illumination estimation and their error metrics, but it is unclear how they perform or which method is more appropriate in a particular scene. We chose Reproduction Angular Error (RAE) as the error measure to compare the performance of twenty-two illumination estimation methods in four different scenes (Open Country, City, Indoor, Lab), and present the best method choice to be used with each scene type.


Title of the Paper: Coupled Method for Solving Time-Fractional Navier-Stokes Equation

 

Authors: S. O. Edeki, G. O. Akinlabi

Pages: 27-34

Abstract: This paper witnesses the coupling of two basic transforms: the He-Laplace transform (HLT) which is a blend of Laplace transformation and Homotopy perturbation methods and the fractional complex transform (FCT). This coupling technique is applied for the solutions of the time-fractional Navier-Stokes model equation. Two examples are considered in demonstrating the effectiveness of the coupled technique. The exact solutions of the solved problems are obtained with less computational work, while still maintaining high level of accuracy with little knowledge of fractional calculus being required. Thus, the proposed method is recommended for handling linear and nonlinear fractional models arising in pure and applied sciences.


Title of the Paper: Simulation Research of Extra-Vehicular Activity Based on Virtual Reality Technology

 

Authors: Weilin Li, Jian Wen, Zeyu Hu, Wenkai Ma

Pages: 21-26

Abstract: In order to solve the problem that six degree of freedom movement and automatic attitude holding of the simplified aid for extravehicular activity rescue (SAFER) on the ground simulation of astronaut's operation cannot be achieved accurately due to the influence of gravity, friction and other conditions. The dynamic simulation model of the device is established by using virtual reality technology. And in the MATLAB/Simulink environment to establish a hybrid control system model, its core concept is based on the Bang-bang control. Under different conditions, the SAFER attitude control process is simulated, and then the scene simulation animation and control process curves are obtained. The simulation results verify the accuracy of the mathematical model and control strategy. Application of virtual prototyping technology model simulation method can describe the device control process accurately and make the design process more efficient. And provide certain theoretical basis and guiding significance to the practical application of SAFER.


Title of the Paper: Effect of Multirate and Suppression Filter in the Performance of Wavelet Packet Multicarrier Multicode CDMA System

 

Authors: Maryam M. Akho-Zahieh

Pages: 12-20

Abstract: Many ways can be considered to improve the performance of Multicarrier Multicode Code-Division Multiple Access (MC\MCD-CDMA) systems. Some of them are to use: Multirates services, suppression filters, wavelet packets, diversity and others. Multirates (MR) services can be provided in MC\MCDCDMA system by varying the number of multicodes for each user according to his data rate but the processing gain of all users must be fixed. Suppression filter (SF) can improve the performance for the system by rejecting the narrow-band jammer interference. Since wavelet packets (WPs) have lower sidelobes compared with sinusoidal carriers, then systems which use WPs as subcarriers are very effective in reducing the problem of intercarrier interference Also, to reduce multiple access interference diversity techniques can be used. In this paper, the effects of MR , WPs and SF on the performance of MC\MCD-CDMA system that uses WPs as subcarrier were investigated. The system is denoted as WP-MC\MCD-CDMA system, and the study includes the effects of number of the rates, SF and its number of taps, WP family type and filter length.


Title of the Paper: Computation of the Electric Fields of System of the Artificial Thunderstorm Cells

 

Authors: Alexander G. Temnikov, Leonid L. Chernensky, Alexander A. Orlov, Tatiana K. Kivshar, Nikolay Y. Lysov, Olga S. Belova, Daria S. Zhuravkova

Pages: 7-11

Abstract: Method of the computation of the electric fields of a system of the artificial thunderstorm cells is considered in paper. It is based on the theoretical and experimentally measured parameters of a turbulent charged aerosol flows. Approaches for calculation of the electric field characteristics of the separate charged aerosol flow have been analyzed for the case of an aerosol chamber. Application of this method for computation of the electric fields of two unipolar or differently charged artificial thunderstorm cells has been considered in paper. It is shown that the maximal electric field strength will achieve in the gap between the positively and negatively charged artificial thunderstorm cells, and above upper and beneath bottom unipolar artificial thunderstorm cells. It was experimentally shown that the model hydrometeor arrays posed in these places could initiate intensive discharge phenomena (powerful streamer and leader discharges) between the charged clouds and between the artificial thunderstorm cells and the ground.


Title of the Paper: The Solution of Boundary Value Problems with Mixed Boundary Conditions via Boundary Value Methods

 

Authors: Grace O. Akinlabi, Raphael B. Adeniyi, Enahoro A. Owoloko

Pages: 1-6

Abstract: Boundary Value Methods (BVMs) are methods based on Linear Multistep Methods (LMMs), which are used for the numerical approximation of Differential Equations (DEs). These methods were introduced to overcome the weaknesses of the LMMs. In this paper, we introduce a new class of BVMs – Hybrid Boundary Value Methods (HBVMs) and used them to solve first order systems BVPs with mixed boundary conditions by using the specific cases: 2, 4 and 6. These methods are also based on LMMs where data are used at both step and off-step points. The maximum errors and rate of convergence (ROC) of the solutions are reported for these cases to illustrate the effectiveness of these new class of methods.