scholarly journals Comparative analysis of cylindrical and planar aesa in 3d suveillance radar.

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Dragan Paunović ◽  
Keyword(s):  
Comparative Analysis ◽  
Vertical Plane ◽  
Optimal Solution ◽  
Main Beam ◽  
Advantages And Disadvantages ◽  
Near Zone ◽  
Constant Shape ◽  
Mechanical Rotation ◽  
Original Configuration ◽  
Selection Of

A modern rotating 3D surveillance radars scan azimuth by mechanical rotation, and scan elevation using Active Electronic Scanning Array (AESA) in Multi Beam Receive Mode (MBM). Radars with fixed cylindrical AESA and four-sided prismatic antenna, with 4 flat AESA, scan azimuth electronically, without mechanical rotation. The most significant advantage of electronic scanning is the possibility of Multi-mode operation: surveillance targets in the far zone and targeting targets in the near zone. However, electronic scanning also brings problems. A main beam of planar AESA spreads and lateral lobes increase when the radiating direction increases. An original arrangement of shifted array to reduce lateral lobes has been proposed. The cylindrical array has a constant shape of pattern during azimuth scanning. But, for both prismatic and cylindrical AESA, the beam deforms during scanning in vertical plane, so limits the elevation scan. Also, the complexity and price of fixed AESA is significantly higher compared to the rotating one. In order to enable the selection of the optimal solution for a specific application, the comparative analysis of advantages and disadvantages for cylindrical, prismatic and rotating AESA is done. The original configuration of the cylindrical AESA for Very Fast Scanning in Near-zone has been proposed.

scholarly journals Comparative analysis of the effectiveness of existing methods of networks security from DDoS attacks

2020 ◽  
Vol 30 (3) ◽  
pp. 67-74
Author(s):  
N. V. Evglevskaya ◽  
A. Yu. Zuev ◽  
A. O. Karasenko ◽  
O. S. Lauta
Keyword(s):  
Comparative Analysis ◽  
Information Security ◽  
Optimal Solution ◽  
Intermediate Stage ◽  
Target System ◽  
Ddos Attacks ◽  
Advantages And Disadvantages ◽  
Network Protection ◽  
User Access ◽  
Online Stores

At present, issues related to information security are highly relevant. DoS and DDoS attacks are carried out by cybercriminals quite often, because cyberattacks can bring almost any system to failure, leaving no legally significant evidence. At the same time, the failure of the attacked subsystem can be an intermediate stage towards the target system. The most vulnerable to DDoS attacks are online stores, online payment systems, news resources and companies, whose activities depend on the frequency of user access to the resource. The main methods of protection against cyberattacks and DDoS attacks, in particular, are currently antivirus programs and firewalls. The article presents a description of some types of DDoS attacks as well as the results of a comparative analysis of several existing methods of networks security from DDoS attacks, which will simplify the choice of the optimal solution to ensure reliable protection of a telecommunication facility. Considering all the advantages and disadvantages, the method of organizing a network protection system against DDoS attacks based on the technology of artificial neural networks is the most suitable solution for ensuring the information security of networks of various purpose.

scholarly journals Comparative analysis of soil discarding by spherical disks

2021 ◽  
Vol 845 (1) ◽  
pp. 012138
Author(s):  
A V Ryzhkov ◽  
A V Machkarin ◽  
K V Kazakov
Keyword(s):  
Comparative Analysis ◽  
Vertical Plane ◽  
Logarithmic Spiral ◽  
Soil Mass ◽  
Working Surface ◽  
Solid Disk ◽  
Circular Arcs ◽  
Working Bodies ◽  
Selection Of ◽  
Made In

Abstract The article presents data on the influence of various types of spherical disks on the discarding of soil in the horizontal and vertical planes during its processing. These studies were conducted in order to optimize the selection of working bodies of disk tillage machines in terms of resistance and processing quality. Three types of disks were used in the comparative analysis. Two types of discs with cutouts and one solid spherical disc. On one type of disk, the cutouts are made in the form of circular arcs, and on the other-in the form of arcs of a logarithmic spiral. The conducted studies have shown that within the working surface of the disk, the trajectories of movement of soil particles under the influence of the three types of disks under study differ little from each other. Although it can be noted that the steeper rise of the trajectory in the vertical plane provides a solid disk, and the smallest rise of the trajectory - at the disk with cutouts in the form of a logarithmic spiral. In the horizontal plane, the longitudinal movement of the soil mass is less in disks with cutouts, especially in a disk with cutouts along the arc of a logarithmic spiral. As a result of these studies, it was revealed that the disk working bodies with cutouts on the cutting edge in the form of arcs of a logarithmic spiral showed the best quality and energy indicators.

scholarly journals Introduction of electronic test tools with the aim of increasing the effectiveness of the knowledge test

2019 ◽  
Vol 16 (4) ◽  
pp. 14-25
Author(s):  
Yuriy Skorin ◽  
Oleksandr Shcherbakov
Keyword(s):  
Comparative Analysis ◽  
Effective Means ◽  
Educational Process ◽  
Control Measures ◽  
Advantages And Disadvantages ◽  
Computer Testing ◽  
Definition Of ◽  
Forms Of Knowledge ◽  
Testing And Evaluation ◽  
Selection Of

In article as the direction of improvement of educational process, increase of efficiency of use of perspective forms of check and an assessment of knowledge introduction in educational process of electronic means of computer testing is defined. The study is based on the analysis of existing forms of verification and evaluation of knowledge and the main types of control measures in the study of the discipline, the allocation of advantages and disadvantages of the main forms of knowledge testing, the rationale for the choice of testing as the most effective means of testing and evaluation of students' knowledge, the allocation of the main types of tests, the prospects of the use of electronic tests conducted using computer technology, the definition of the function of computer testing, comparative analysis of software products, providing the implementation of computer testing and selection of the most promising of them, capable, on the one hand, to simplify the testing process, and on the other hand, significantly improve the efficiency of testing and evaluation of students' knowledge. The study suggests: first, analysis, generalization and understanding In article as the direction of improvement of educational process, increase of efficiency of use of perspective forms of check and an assessment of knowledge introduction in educational process of electronic means of computer testing is defined. The study is based on the analysis of existing forms of verification and evaluation of knowledge and the main types of control measures in the study of the discipline, the allocation of advantages and disadvantages of the main forms of knowledge testing, the rationale for the choice of testing as the most effective means of testing and evaluation of students' knowledge, the allocation of the main types of tests, the prospects of the use of electronic tests conducted using computer technology, the definition of the function of computer testing, comparative analysis of software products, providing the implementation of computer testing and selection of the most promising of them, capable, on the one hand, to simplify the testing process, and on the other hand, significantly improve the efficiency of testing and evaluation of students' knowledge. The study suggests: first, analysis, generalization and understanding of the experience of using modern methods of knowledge control, analysis of existing forms of knowledge assessment and the main types of control measures, identification of advantages and disadvantages of the main forms of knowledge testing;  secondly, the rationale for the choice of testing as the most effective means of testing and evaluation of knowledge, the allocation of the main types of tests, the rationale for the prospects of the use of electronic tests conducted using computer technology; third, the analysis of the conditions for the effective use of test control, the definition of the function of computer testing, comparative analysis of software products that provide the implementation of computer testing, the selection of the most promising of them that can improve the efficiency of testing and evaluation of students' knowledge.

scholarly journals Comparative analysis of calculation methods for enclosing pit structures

2021 ◽  
Vol 18 (3) ◽  
pp. 92-99
Author(s):  
V. V. Konyushkov ◽  
Keyword(s):  
Comparative Analysis ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Preliminary Calculation ◽  
Elastic Line ◽  
Advantages And Disadvantages ◽  
Software Packages ◽  
The Stability ◽  
Cost Of Materials ◽  
Selection Of

Choosing the calculation method for the enclosing excavation pit structures is an urgent issue, since the results of the calculations determine the selection of the geometric and mechanical parameters, as well as the estimated cost of materials and works. At present, at calculation of the enclosing structures of excavation pits, there are used classical semi-graphical solutions, semi-analytical programs and software packages based on the finite element method. Each method has its own prerequisites and assumptions, as well as advantages and disadvantages. The purpose of this article is presentation of comparative analysis results of the main methods for calculating the enclosing structures of excavation pits considering their features and boundary conditions of application. The author has performed test calculations of the excavation pit enclosing structures using the elastic line method in the SCAD and PLAXIS 2D software packages. The author has also developed and proposed a simplified method for calculating pit fences. This method can be used at the pre-project stage of construction in the form of preliminary calculation or as additional verification calculation of the stability, strength and deformability of pit enclosing structures.

An Analysis on Structure Type Selection and Optimization of the Formtraveller for Cantilever Construction

2013 ◽  
Vol 454 ◽  
pp. 140-144
Author(s):  
Xiao Yu Liu ◽  
Liang Li
Keyword(s):  
Comparative Analysis ◽  
Structure Type ◽  
Advantages And Disadvantages ◽  
Working Space ◽  
Type Selection ◽  
Structural Rigidity ◽  
Steel Consumption ◽  
Main Factors ◽  
Cantilever Construction ◽  
Selection Of

Aiming at the advantages and disadvantages of triangle and rhombic main truss-types and their respective scopes of application, a comparative analysis for the two commonly used truss-type formtravellers has been done. The main factors for analysis are load bearing capability, structural rigidity, steel consumption and working space. It provides a useful reference for the design and selection of the formtraveller. In addition, for the overall deformation of the formtraveller, it is structural optimized while height of column of the truss and suspenders are changed. Finally, the analysis results show the reasonable height of the column and suspender arrangement to achieve the construction target of safety and cost-effectiveness.

Identifying Measurement Invariant Item Sets in Cross-Cultural Settings Using an Automated Item Selection Procedure

Methodology ◽  
2018 ◽  
Vol 14 (4) ◽  
pp. 177-188 ◽  
Author(s):  
Martin Schultze ◽  
Michael Eid
Keyword(s):  
Measurement Invariance ◽  
Optimal Solution ◽  
Selection Procedure ◽  
Cross Cultural ◽  
Item Selection ◽  
Ant System ◽  
Item Quality ◽  
Ant System Algorithm ◽  
Selection For ◽  
Selection Of

Abstract. In the construction of scales intended for the use in cross-cultural studies, the selection of items needs to be guided not only by traditional criteria of item quality, but has to take information about the measurement invariance of the scale into account. We present an approach to automated item selection which depicts the process as a combinatorial optimization problem and aims at finding a scale which fulfils predefined target criteria – such as measurement invariance across cultures. The search for an optimal solution is performed using an adaptation of the [Formula: see text] Ant System algorithm. The approach is illustrated using an application to item selection for a personality scale assuming measurement invariance across multiple countries.

Agrarian receipts as a tool for the structural transformation of financial and credit relations in the agrarian business of the region

2019 ◽  
pp. 40-53
Author(s):  
Yuliia Nehoda
Keyword(s):  
Comparative Analysis ◽  
Retrospective Analysis ◽  
Structural Transformation ◽  
Pilot Project ◽  
Bank Lending ◽  
Economic Benefits ◽  
Advantages And Disadvantages ◽  
New Instrument ◽  
Agricultural Business ◽  
Business Entities

The subject of the research – is a set of organizational-economic relations arising in the process of structural transformation of financial and credit relations in the agricultural business. The purpose of the article is a retrospective analysis of structural transformations of financial and credit relations in the agricultural business, evaluation of the effectiveness and feasibility of the introduction of agricultural receipts as a new instrument of lending to the agricultural business of the regions. Methodology of work – system-structural and comparative analyzes (to determine the effectiveness of the crediting mechanism according to the agricultural receipts of the farmers of the region); monographic (when studying the problems of the functioning of the mechanism of lending to agrarians by agrarian receipts) economic analysis (when carrying out a comparative analysis of the mechanism of classical bank lending to the agrarian business and the mechanism of lending to agrarians according to agrarian receipts); modeling and forecasting (when determining ways to overcome the existing deficiencies in the mechanism of lending to agrarian business entities of the region according to agrarian receipts). The results of the work – a retrospective analysis of the structural transformation of financial and credit relations in the agricultural business was carried out. The mechanism of crediting agrarians according to agrarian receipts and the scale of its distribution in the agrarian business of the region are considered. A comparative analysis of the mechanism of classical bank lending to the agrarian business and the mechanism of lending to agrarians according to agrarian receipts was carried out. In the framework of the pilot project “Agrarian receipts in Ukraine” of the international financial corporation (IFC) in partnership with the Swiss Confederation in Ukraine, the example of the Poltava region defined the effectiveness of the crediting mechanism according to the agrarian receipts of the agrarians of the region. The advantages and disadvantages of the mechanism of crediting the subjects of the agrarian business on agrarian receipts are noted. The ways to overcome the existing shortcomings of the mechanism of crediting the subjects of the agrarian business of the region according to agricultural receipts are determined. Conclusions – according to the results of the conducted research, the effectiveness of the mechanism of lending to the agricultural business of the regions according to agricultural receipts was proved, its advantages and disadvantages were noted, and attention was also focused. Proposed in Art. 7 of Law No. 5479-VI clearly delineate cases and restrictions on the debtor’s reimbursement of expenses incurred by the lender with the acquisition of the right to grow and harvest the pledged crop of agricultural products, which will ensure the principle of equality of parties on economic benefits and distribution of credit risks according to agricultural receipts.

Research of methods of protecting organizations from inimical mergers and acquisitions

2020 ◽  
pp. 29-45
Author(s):  
O.A. Naydis ◽  
I.O. Naydis
Keyword(s):  
Comparative Analysis ◽  
Mergers And Acquisitions ◽  
Positive Effects ◽  
Advantages And Disadvantages ◽  
Preventive Methods

The article considers the types, forms, mechanisms and classification of mergers and acquisitions, identifies their positive effects, and studies the tactics of acquisitions. The analysis of anti-capture measures: active and preventive methods of protection against hostile mergers and acquisitions. A comparative analysis of anti-capture measures with acquisitions tactics was carried out, the advantages and disadvantages of their application were identified.

ON COMPARATIVE ANALYSIS OF PERFORMANCE OPTIMIZATION METHODS OF MULTI-PUMP UNITS

2020 ◽  
pp. 23-28
Author(s):  
A.I. Glushchenko ◽  
M.Yu. Serov
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Comparative Analysis ◽  
Performance Optimization ◽  
Optimization Methods ◽  
Online Optimization ◽  
New Approach ◽  
Advantages And Disadvantages ◽  
Analysis Of Performance

В статье рассматривается вопрос совершенствования системы управления параллельно-работающими насосными агрегатами с целью повышения энергоэффективности их работы. Проведено сравнение и выявление недостатков существующих методов решения рассматриваемой проблемы. Предложена идея нового подхода на базе онлайн оптимизации. The problem under consideration is improvement of the energy efficiency of a control system of parallel-running pump units. Known methods used to solve this problem are considered. Their advantages and disadvantages are shown. Finally, the idea of a new approach, which is based on online optimization, is proposed.

Dynamics of export potential of sunflower oil in Ukraine

Helia ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kateryna Vasylkovska ◽  
Olha Andriienko ◽  
Oleksii Vasylkovskyi ◽  
Andrii Andriienko ◽  
Popov Volodymyr ◽  
...  
Keyword(s):  
Climate Change ◽  
Comparative Analysis ◽  
Sunflower Oil ◽  
Climate Changes ◽  
Qualitative Change ◽  
Sunflower Seeds ◽  
Cultivation Technology ◽  
Selection Of

Abstract The analysis of the production and yield of sunflower seeds in Ukraine for the period from 2000 to 2019 was conducted in the article. The comparative analysis of the gross harvest of sunflower seeds and the export of sunflower oil for the years under research was carried out. The dependence of exports on gross harvest was revealed and its share was calculated. It was determined that the export of sunflower oil has increased over the years under research, which indicates a significant Ukraine’s export potential. It was found that the increase in the share of exports by 15.9% was made possible by a qualitative change in yield, that was ensured by the changes in the cultivation technology and by the selection of sunflower hybrids that are better adapted to climate changes. The recommendations for further improvement of cultivation technology in connection with climate change in order to further increase yields and the export potential of Ukraine were given.

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