bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of compact grid-characteristic schemes for acoustic problems
Authors: Golubev V I , Khokhlov N I , Nikitin I S , Churyakov M A
Published: May 2020

This work is devoted to the numerical solution of the acoustic problem. It has a lot of important applications, for example, direct and inverse problems of the seismic survey process. The grid-characteristic approach was used to transform the problem into a set of independent linear transport equations. In one-dimensional case explicit numerical schemes for continuous and discontinuous materials were derived. Using differential sequences of initial equations, the new compact scheme on the two-point spatial stencil was proposed. A set of numerical experiments with different initial conditions and materials were carried out. Direct numerical simulations proved the third order of the approximation.
The condition number of a matrix as an optimality criterion in the problems of parametric identification of linear equations systems
Authors: Kantor O G , Spivak S I , Petrenko V R
Published: May 2020

When solving applied problems, an important aspect of the analysis is the stability of the obtained solution with respect to experimental data errors. Empirical experimental data, although a priori inaccurate, can be represented by intervals of their range of values. In some cases, the limits of their variation may also be known. Obviously, the degree of inaccuracy of input data influences the solution of the parametric identification problem. Therefore, in the case when this solution is not the only one, methods for assessing the influence of experimental error on the stability of each potential solution are of interest as they may provide additional arguments in favour of choosing one of them. In the case of models formalized in the form of systems of linear algebraic equations, a similar effect can be investigated using the condition number. In a case of quantitative analysis of multicomponent mixtures, the paper presents an approach to the parametric identification of linear models based on the calculation of the maximum permissible parameter estimates in combination with the study of the coefficient stability of the system.
Method of forming expert coalitions in the context of solving the expertise problem of alternatives with weakly formalized criteria
Authors: Melnikov A V , Shcherbakova I V , Zhilin R A
Published: May 2020

The article describes the worked on numerical technique for forming alternative coalitions of experts relating to solving weakly formalized problems and the results of verification of the proposed method by the example of the studying the attributes of violators in the field of physical protection of critical information infrastructure objects. The proposed methodology for conducting preliminary examination on the basis of the worked on numerical method for identifying coalitions of experts allows to perform the procedure for forming an agreed group of experts and obtaining preliminary estimates of the significance of the attributes of a violator during a single survey of experts, that significantly saves time and reduces the complexity of the expertise of objects. Using the worked on numerical method, the main and two alternative coalitions were identified. Taking into account the alternative opinion of experts allowed 31 experts to be identified as agreed upon, which more precisely determines the results of the expertise.
Simulation of wave impact on shore protection structures using 3D model of wave processes
Authors: Protsenko S V
Published: May 2020

The article is devoted to the research of the effects of wave processes on shore protection structures using mathematical model of wave processes based on the system of Navier-Stokes equations, which includes three equations of motion in areas with dynamically changing geometry of the computational domain. The pressure correction method is used for the approximation of a hydrodynamic model. The difference schemes describing the mathematical model of the wave propagation towards the shore are constructed on the basis of the integro-interpolation method using the scheme with weights. An adaptive alternating-triangular iterative method is used to solve the system of grid equations. The model presented in the article gives more realistic description of the physical wave process near the coastline. The practical significance of the numerical algorithms and program complex for their implementation is the possibility of their application in the study of hydrophysical processes in the coastal water systems, as well as to build the velocity and pressure fields of the water environment and the evaluation of hydrodynamic effects on shore protection structures and coastal structures.
On using artificial neural networks for calibrating tempered stable Lévy processes to probabilities of crossing absorbing barriers
Authors: Kudryavtsev O , Rodochenko V
Published: May 2020

We propose a new method for calibrating tempered stable Lévy processes based on an artificial neural network (ANN), which takes probabilities of crossing a number of fixed barriers by a random walk as input data, and demonstrate its performance for the widely used CGMY model. To train the network we use real historical data and a synthetic dataset. We download and prepare the former to create a sequence of histograms with historical probabilities of crossing the set of barriers by log-returns of the underlying asset. To construct the synthetic dataset, we generate the values of the CGMY model’s parameters and calculate the respective probabilities of crossing the barriers as prices of synthetic one-touch-digital options by means of an effective numerical method, which is based on the fast Wiener-Hopf factorization technique. After that, we become able to calibrate the parameters for this model by means of the trained ANN, using the probabilities as input data. As the result, we obtain a fast method to calibrate the CGMY Lévy model, which can be used to solve risk management problems on financial markets – especially for the case where the asset under consideration is highly liquid and highly volatile at the same time (e.g. cryptocurrencies).
An analysis of the models informativeness in parametric identification problems
Authors: Kantor O G , Spivak S I , Podvalny S L
Published: May 2020

Solving problems of parametric identification with uncertainty in the initial data due to their inaccuracy and incompleteness complicates, and, in some cases, even rules out the possibility of using classic mathematical and statistical methods as the latter are meant to deal with sufficiently large amounts of observations. These conditions involve the use of specific methods to directly determine the exact type of functional link and to verify its qualitative characteristics. A set of such characteristics also forms an idea of the informativeness of a model. This paper considers the characterization of this concept in relation to parametric identification problems and presents a method of their solution where the procedure of the analysis of informativeness of the obtained models is formalized. Approbation of the developed technique was carried out on the example of parametric identification of the time series model. This time series cannot be linearized. A small number of observations were also known. All these conditions precluded the use of statistical methods to construct a time series model.
Method of paralleling grid nodes for multidimensional regions when solving parametric identification tasks
Authors: Kantor O G , Spivak S I , Yusupova G N , Podvalny E S
Published: May 2020

One of the approaches to solving parametric identification problems is based on numerical methods. In fact, their use is reduced to the process of iterating over the elements of multidimensional areas of the desired parameters. Increasing the density of the introduced grid increases the amount of calculations and time spent on the process of their implementation. Increasing the density of the introduced grid increases the amount of calculations and time spent on the process of their implementation. In this regard, it is desirable to improve the efficiency of the computer systems used. An important direction in the context of the above is the development of procedures for parallelization of programs. The article presents an algorithm for searching the nodal points of multidimensional areas based on the principle of data decomposition. In regard to solving the problem of parametric identification of the diffuse Bass model of the spread of innovation, its practical implementation has been carried out.
Investigation of interaction of borocarbon nanotubes with gas phase atoms
Authors: Boroznin Sergey , Zaporotskova Irina , Boroznina Natalia , Bakhracheva Yulia
Published: May 2020

During the study of adsorption interaction by computer modeling, it was found that adsorption of oxygen, fluorine and chlorine atoms is possible on the surface of a carbon nanotube. In the course of comparing the surface sorption activity of BC5 nanotubes with respect to various chemical elements, it was found that the interaction of the oxygen atom with the surface of the borocarbon nanotube is the most energetically advantageous. The introduction of boron atoms promotes a more active addition of oxygen, fluorine and chlorine atoms to the surface of the nanotube, that is, structural modification leads to an increase in the sorption activity of carbon nanotubes.
Simulation of the coordination number of random sphere packing
Authors: Migal L V , Bondarev V G , Chekanov N A , Bondareva T P
Published: May 2020

Given article presents a generalized equation for calculating the average coordination number from the density of a random sphere packing, supplemented by a dependence on the threshold value of the interparticle distance in two- and three-dimensional spaces. It is shown that the calculation of the average coordination numbers according to the proposed equation gives an unambiguous correspondence between the simulated, calculated and experimental data for threshold values of more than 1.02 particle diameters. An explanation of the weak dependence of the average coordinate number on the packing density for small threshold values of the interparticle distance is given in this work.
Search for the optimal temperature regime for the synthesis of benzylidenebenzylamine based on genetic algorithms
Authors: Antipina E V , Mustafina S A , Antipin A F , Podval’nyi E S
Published: May 2020

The article is devoted to the creation of an algorithm for finding the optimal temperature regime of a chemical reaction based on evolutionary calculations. The problem of optimal control for a chemical process is formulated in a general way. A genetic algorithm for solving the problem is described. A computational experiment was carried out for the synthesis reaction of benzylidenebenzylamine in order to obtain the maximum yield of the product during the reaction. The optimum temperature profile and the optimal concentration of reagents were obtained. Based on the formulated genetic algorithm, a program was developed in the visual programming environment Delphi, which allows finding the optimal temperature profile of the chemical process.
Probability distributions unimodality of finite sample extremes of independent Erlang random variables
Authors: Virchenko Yu P , Novoseltsev A D
Published: May 2020

Samples of independent identically distributed random non-negative values

r
∼

1

,
…
,

r
∼

N

with a finite size

N
≥
2

are studied. It is posed the problem to find the sufficient conditions for their common probability distribution

Q
(
x
)
=
Pr
{

r
∼

j

<
x
}
,
j
=
1
÷
N

which guarantee the unimodality of the probability distributions

F
N

(
+
)

(
x
)
=
Pr
{

r
∼

+

<
x
}

and

F
N

(
−
)

(
x
)
=
Pr
{

r
∼

−

<
x
}

which correspond to the maximum

r
∼

+

=
max
{

r
∼

j

;
j
=
1
÷
N
}

and to the minimum

r
∼

−

=
max
{

r
∼

j

;
j
=
1
÷
N
}

of the sample, respectively. It is proved that if the distribution Q is determined by a continuously differentiable Erlang probability density q of an arbitrary order

n
∈

N

then distributions

F
N

(
±
)

are unimodal.
Analysis of the properties of OLS-estimates in parameter identification of distributed dynamic processes
Authors: Matveev M G , Sirota E A
Published: May 2020

This work is devoted to analysis and research of OLS-estimates properties when identifying parameters of distributed dynamic processes. The study showed that at a low level of observation errors (1% and lower), the use of direct OLS estimates to identify parameters of distributed dynamic processes gives satisfactory results. At the same time, the displacement value is always slightly higher than the value of the standard deviation of the parameter estimate, which does not allow to neglect the displacement, especially at a high and average level of observation errors. The method of obtaining so-called alternative OLS-estimates is also proposed, which allows to reduce multicollinearity in sample statistics and at any level of observation errors significantly reduce standard error of parameter estimation.
Application of a fundamental solution to a problem operator for modeling vibrations of elastically supported load-bearing structures
Authors: Skalko Yu I , Yu Gridnev S , Minaeva N V
Published: May 2020

The work is devoted to the construction of effective computational algorithms for modeling vibrations of elastically supported load-bearing systems. An approach is developed based on the representation of a mathematical model in the form of partial differential equations for generalized functions. With this approach, the presence of elements with a very high stiffness in the design made it necessary to carry out the calculation with a very small time step. To build a computational algorithm, a fundamental solution to the problem operator is used, which allows one to obtain a solution at the next time step for each point of the spatial grid independently. The need to carry out the calculation with a very small time step arises only in nodes that coincide with the location of structural elements with very high stiffness. The proposed approach allows simulating impact forces and instantaneous change of boundary conditions. The possibility of using the model with an absolutely rigid restraining support as a limit transition from a model of elastic bond of high rigidity was researched on.
Experimental estimation of channel width of IP BPX subscribers in OpenVPN IP networks
Authors: Telkov A Y , Olimpiev N V
Published: May 2020

This paper presents the methodology and results of an experimental estimation of the channel width required to transfer traffic from VoIP subscribers connected via VPN technology to IP ATC Asterisk. OpenVPN technology with typical settings (tun interfaces, routed network segments and TCP transport protocol) was used. An updated tool for estimating the volumes of transmitted and received traffic was used, based on data processing from the ipcad sensor — an emulator of the Cisco NetFlow mechanism for linux routers. The operator representation of extracting information about single network sessions is used.
The influence of friction on behavior of a hyperelastic body in a conic channel
Authors: Astapov Yuri , Markin Alexey
Published: May 2020

The model problem about the axisymmetric quasistatic motion of an elastic sphere considering the interaction with inner surface of a rigid cone die is investigated. The constitutive model is represented by the physically nonlinear generalization of the linear model of Hencky’s elastic material. The tensor of logarithmic strains is used by way of strain measure due to described below special properties. The influence of friction on macro characteristics of a process is studied using proposed numerical model of accounting of mixed boundary conditions on time-changing contact surface.
Analysis of non-uniform residual stress state in plates with in-plane and transverse heterogeneities
Authors: Nedin R
Published: May 2020

In the present paper, we describe a model of a prestressed inhomogeneous body and provide the variational and weak statements. On its basis, we study a problem of mixed vibrations of a non-uniform plate with inclusions and a sandwich-structured three-ply plate under the conditions of the residual stress-strain state. We build the numerical finite-element solution on the basis of the weak problem statement and analyze the effect of the prestress states on its frequency response functions. In addition, we identify the prestress level in the middle layer of the composite plate by the data on frequency characteristics measurements.
On quasi-linearization of correlations in quadratic elasticity theory for isotropic media
Authors: Matchenko N M
Published: May 2020

This paper exposes the strain potential of the quadratic theory of elasticity for isotropic media. The strain potential is represented as a sum of the quadratic and the cubic part. A system of experiments, carried out to define five constants included in the potential, is exposed. Different variants of building quasi-linear correlations are discussed. The rationality of linearizing constitutive correlations by reducing the degree of the potential’s cubic part by division by the quadratic convolution module of stress tensor components is doubted because the correlations thus found are lengthier than the correlations from the quadratic elasticity theory.
Vibrations of cylindrical shells with rectangular cross-section
Authors: Dzebisashvili G T , Filippov S B
Published: May 2020

The free vibrations of cylindrical shells with rectangular cross-section are studied in the work. The precision of Rayleigh method for various admissible functions and different boundary conditions is evaluated. Using finite element method, the natural frequencies in the case of deviation of the cross-section shape from square to rectangular are examined, and the vibration frequencies and modes for the shell joined with the plate are studied for various plate thicknesses. Additionally, fundamental frequency behavior is analyzed in the case of fixed support, as one of the cross-section sides approaches zero.
Simulation of pyrolysed polyacrylonitrile based composite with amorphising boron additives
Authors: Kakorina O A , Zaporotskova I V , Kakorin I A , Kozhitov L V
Published: May 2020

The paper deals with the possibility of modifying pyrolyzed polyacrylonitrile with amorphizing additives. Adsorption features of the boron atom on the surface of the monolayer of polymer are studied, and the geometric and electron-energy characteristics of the composite obtained are established. The calculations were performed using the semi-empirical MNDO method within the framework of the molecular cluster model.
Computational algorithms based on the fundamental solution of task operator
Authors: Skalko Yu I , Yu Gridnev S , Minaeva N V
Published: May 2020

An approximation of matrix Green’s function for a hyperbolic system of linear differential equations of the first order has been created. An algorithm for an approximate solution of the generalized Riemann problem of discontinuity decay in the presence of additional conditions at the boundaries has been proposed. A computational algorithm for the approximate solution of boundary value problems for hyperbolic systems of equations has been set up on the basis of these solutions. The algorithm is implemented for a system of equations describing the propagation of elastic waves in a block-fractured medium. The results of the numerical experiments aimed at studying the possible mechanisms of propagation of elastic waves to a considerable depth without scattering have been presented.
Experimental Investigations of Enhanced Micro Structured Heat Sinks
Authors: Hadi Ammar M. , Ismael Muneer A. , Sadiq Maher A.R. , Alhattab Haider A.
Published: May 2020

In this research, we focus on the performance of heat sink, new configurations of the micro heat sink with comprises of pinned copper pieces of appropriate dimensions have been proposed. Dozens of different shapes micro heat sinks have been manufactured from brass using Laser technique. These heat sinks have been coupled individually with a simulated electronic circuit including a power transistor to freely dissipate the generated heat. Bulk temperatures of heat sink and the power transistor have been measured using a thermal camera. The results showed that, in general, the finned heat sink of either configuration augments heat transfer compared with smooth one. It is found that the maximum percentage reductions in temperature of the transistor are demonstrated with two uncommon configurations, namely the leaves-shaped fin (LSF) 9.352% and the drop-shaped fin (DSF) 9.353%. on the other hand, a staggered wavy fin (SWF) shows minimum percentage reduction in transistor temperature, 0.952%. It has been shown that through this research and by using several models of heat sink, the increase in surface area is not only the factor (major) to increase the heat transfer to the surrounding environment. This makes it possible to design fins with a smaller surface area but more heat dispersionIn this research, we focus on the performance of heat sink, new configurations of the micro heat sink with comprises of pinned copper pieces of appropriate dimensions have been proposed. Dozens of different shapes micro heat sinks have been manufactured from brass using Laser technique. These heat sinks have been coupled individually with a simulated electronic circuit including a power transistor to freely dissipate the generated heat. Bulk temperatures of heat sink and the power transistor have been measured using a thermal camera. The results showed that, in general, the finned heat sink of either configuration augments heat transfer compared with smooth one. It is found that the maximum percentage reductions in temperature of the transistor are demonstrated with two uncommon configurations, namely the leaves-shaped fin (LSF) 9.352% and the drop-shaped fin (DSF) 9.353%. on the other hand, a staggered wavy fin (SWF) shows minimum percentage reduction in transistor temperature, 0.952%. It has been shown that through this research and by using several models of heat sink, the increase in surface area is not only the factor (major) to increase the heat transfer to the surrounding environment. This makes it possible to design fins with a smaller surface area but more heat dispersion.
Pilgrims tracking and monitoring based on IoT
Authors: Issam Younis Mohammed , Hashim Abdulkareem Mustafa
Published: May 2020

The pilgrimage takes place in several countries around the world. The pilgrimage includes the simultaneous movement of a huge crowd of pilgrims which leads to many challenges for the pilgrimage authorities to track, monitor, and manage the crowd to minimize the chance of overcrowding’s accidents. Therefore, there is a need for an efficient monitoring and tracking system for pilgrims. This paper proposes powerful pilgrims tracking and monitoring system based on three Internet of Things (IoT) technologies; namely: Radio Frequency Identification (RFID), ZigBee, and Internet Protocol version 6 (IPv6). In addition, it requires low-cost, low-power-consumption implementation. The proposed system can efficiently handle the pilgrimage challenges; namely: the language barrier, identifying of injured or dead pilgrims, directing lost pilgrims, knowing medical records of pilgrims, and the crowd management. Finally, another paramount characteristic of the proposed IoT-based system is allowing the authorities, the heath-givers, and the pilgrim’s family for real-time tracking and monitoring of pilgrim during the pilgrimage anytime, anywhere.
Smart Digital Bi-Directional Visitors Counter Based on IoT
Authors: Azher Therib Mohammed , Marzog Heyam A. , Jaleel Mohsin Marwa
Published: May 2020

This research presents the design of a smart digital bidirectional visitor counter (SDBVC). The million religious visits especially in Iraq increased the need for accurate smart counting systems for human to count the largest gathering of people in one place. The major focus is on counting huge number of humans enter one place from multiple entrance gates. The central processing unit (CPU) receives all the data from these gates and finally makes the studies about the overall human number, men number, women number, the period of the day that this number reach the highest and smallest number and etc. The proposed project hardware contains multiple Wi-Fi based Arduino microcontrollers (like Node-MCU Arduino): one Arduino in each gate which is called transmitter and one in CPU which is called receiver, multi ultrasonic sensors for each transmitter placed on the entrance gates (men gates data separated from women gates data). ThingSpeak.com is used to save the large recorded data for long time for example many days and give results and records about the number as Arba’een Pilgrimage for Imam Hussein shrine in Iraq. The proposed system gives accurate results on the number of entered and exit people to and from one place.
Performance evaluation of LTE and UMTS cellular networks in Iraq with multiple terrains
Authors: Al-Kadhimi Aymen M
Published: May 2020

Cellular network planning is an essential stage that precedes implementation phase. The planning performance is widely dependent on the terrestrial features of the environment where a network is planned to be implemented in. This work involves the cellular planning of three networks applied in two cities, namely Baghdad and Shaqlawa, with different terrains. Two networks are planned in a flat terrain (Baghdad city) using universal mobile telecommunications system (UMTS) and long term evolution (LTE) technologies and one network is designed in a hilly terrain (Shaqlawa city) utilizing UMTS technology. In this study, several calculation themes are applied to evaluate the performance of the proposed planning such as coverage, power level, carrier to interference ratio, best server and elevation calculations. Also, some clients and points are positioned across networks to measure power levels, interference and coverage at different locations more precisely. The measurements show that the UMTS networks cover an area of 63.62 km2 compared with 81 km2 coverage area in the LTE network with different quality of service graduating from quadrature amplitude modulation (QAM16) and quadrature phase shift keying (QPSK) to voice services. In addition, comparisons between the networks are discussed and enhancement suggestions are presented in this paper.
Design and Implementation of Home Automation with Comforting Sensors (HACS)
Authors: Aamer Fadhil Saif , Musa Yaseen Wafaa , Abd Alkareem Raqeeb
Published: May 2020

In this research we proposed designing a house that facilitates the daily life of human and makes it safer. This was done by identifying some of the necessary actions in our daily lives and applying the idea to them. We did this by developing sensors that work similarly to the five human senses and design a reaction that fits the circumstances. This was done using some mini electronic devices.
ON DUAL RICKART MODULES
Authors: Qader Rahman Mohammed , Al-Bahram Bahar hamad
Published: May 2020

Gangyong Lee, S. Tariq Rizvi, and Cosmin S. Roman studied Dual Rickart modules. The main purpose of this paper is to develop the properties Dual Rickart modules. We prove that a module M and indecomposable N if M is N-dual Rickart module, then either Hom(M, N) = 0 or every non zero R-homomorphism from M to N is a epimorphism. And we give various characterizations of some kind of rings in term of dual Rickart modules.
Derivations in Gamma Rings with γ-Lie and γ-Jordan Structures
Authors: Majeed Abdulrahman H. , Ali Hamil Shahed
Published: May 2020

Let M be weak Nobusawa Γ-ring and γ be non-zero element of Γ. In this paper, we study the definition of γ-semi prime Γ-ring, and introduce definition of γ-semi simple Γ-ring and γ-Jordan ideal of M. We give equivalent definitions for γ-prime Γ-ring and γ-semi prime Γ-ring. Also by using relation between Γ-rings and rings, we give some commutativity conditions on Γ-rings.
Derivations and reverse derivations on γ-prime and γ-semiprime gamma semirings
Authors: Majeed Abdulrahman H. , Ali Hamil Shahed
Published: May 2020

In this paper, we introduce the notion of k-derivation, generalized k-derivation and k-reverse derivation on gamma semirings, and we give some commutativity conditions on γ-prime and γ-semiprime gamma semirings. Also, we give orthogonality for pairs of k-reverse derivations on gamma semirings.
A Survey of Localization Systems in the Sea Based on New Categories
Authors: Hamad S , Ali Y H , Shaker S H
Published: May 2020

Localization schemes are considered very important issue for wireless networks. Today, positioning information takes big space from current research or study. In other words, localization approaches are one of the most significant works which support the creation of new innovations, services, applications and business models in the area of the most system or networks. Different methods, wireless technologies and systems were suggested in the literature to provide sea localization services to enhance the services provided to users. There is, however, a lack of an update survey paper which integrates some of the precise and accurate localization systems recently proposed. In this paper, we intend to conduct a survey of various techniques of localization in sea based on different technologies and systems that was mentioned in the literature. The paper focuses primarily on localization systems from new vision. The current systems introduced in the literature are highlighted and classified in new categories. By comparison to the current surveys, different systems are also previewed from the perspective of their technologies they used. Instead of these classifications, we are proposing a new category for the localization systems and we are also addressing remaining challenges to accurate localization.
Hollow-R-Annihilator-Lifting Modules
Authors: Ibrahim Omar K , Elew Alaa A
Published: May 2020

Asubmodule N of amodule W is R-annihilator-small submodule iin W, (N ≪a W), if whenever N+T = W, where T a submodule of W, implies that annR(T) = 0 where annR(T) = {r ∊ R; r.T = 0}. AnR-module W is R-annihilator-lifting module if for every submodule N of W there exists submodules L and K ofW such that W = L ⊕ K with L ≤ N and N ∩ K ≪a K. Amodule W is called hollow-R-annihilator-lifting module, if for every submodule F of W with

W
F

is hollow, there exiists a direct summand K ofW and

F
K

≪
a

W
K

(
K

≤

ace

F

in

W
)

. Inthis paper, we prove various for this kind of module.
Unequal clustering and scheduling in Wireless Sensor Network using Advance Genetic Algorithm
Authors: Yas Ruwaida M , Hashem Soukaena H
Published: May 2020

Duo to limited energy of the sensor nodes which forming the wireless sensor network (WSN), and almost deployed in harsh environment, therefore it is very important to minimize the consumption of the sensor node’s energy. For this reasons designing an energy efficient clustering and scheduling of sensor nodes considered the most efficient methods for extending the WSN’s lifetime. In this paper, we have proposed Genetic algorithm based methods for clustering and scheduling. The proposed methods have two stages; in the first stage GA is used for cluster formation where the chromosome is represented by using the sensor node’s position. While in the second stage GA is used for selecting a minimum number of nodes while maintaining the full coverage and the connectivity of the selected nodes. The simulation result shows that the proposed algorithm (AGA) is more efficient than the existent algorithms in terms of number of first node die per round, number of a live nodes, and energy consumption.
Ethical Hacking Implementation for Lime Worm Ransomware Detection
Authors: Sultan Nagham A , Thanoon Karam H , Ibrahim Omar A
Published: May 2020

Nowadays, computer worms become one of the most dangerous types of malwares threats. Computer worms have evolved during the time with sophisticated forms such as crypto type ransomware. Lime worm is one of these worm kinds. The researchers apply this worm on real environment in lab (ethically and for education purposes) and this paper presents the capabilities of this worm. This paper also presents static analysis by applying many tools, which are used to obtain the key information of lime worm. This paper discovers that applying static analysis on this type of worms is very effective and accurate. The obtained key information are used to develop a software for detecting lime worm and the ability to erase it.
Survey\ Towards a sustainable Information and Communication Technologies (ICT) in Iraq
Authors: Hussein Abd A , Hussein Kalian M , Saleh Hassan H , Farhan Ibrahim H
Published: May 2020

The past four decades have witnessed a rapid and tremendous development in information and communication technologies (ICT), which has led to development in various theoretical and practical fields. In addition, technological diffusion has become a prominent feature in developed countries, which made most developing countries seek to own it because it is the backbone and the main pillar of its development and prosperity. Although Iraq is a country with diverse and enormous resources and a dominant geographical position that makes it at the forefront of the regional and global economy, it still suffers from crises and stagnation due to regional and global conflicts as a battlefield, as well as successive mismanagement and lack of technological awareness in simulating the rapid development of ICT with modern and high technology. In this paper, we will come to learn in brief about the Information and Communication Technology (ICT) and its role in community development will be briefly identified. We also look at the general technological diffusion index by analysing its main and sub-indicators to the Arab countries group, and then we focus on the main obstacles and challenges facing it in Iraq. Last but not least, we will try to lay the scientific foundations according to modern ICT indicators to overcome and defuse those challenges, and finally we have made suggestions and recommendations that contribute to the achievement of the goal that we aspire for throughout this research.
ON Ngrα0–closed set and Ngrα0–continuity with their Applications
Authors: Abdul-Kadir Saleh Ekram , Jasim Taha H.
Published: May 2020

The paper is conducted to provide Ngrα0-closed set, and introduce some of the properties. We, also, determine the risk of the factors for causing UPS via the concept of “Nano topology”.
An Accurate Fall Detection System for the Elderly People Using Smartphone Inertial Sensors
Authors: Kadhum A A , Al-Libawy H , Hussein E A
Published: May 2020

In developed countries, the number of elderly people living alone is continuously increasing. These people are more vulnerable to serious health issues, such as falling down. A sensor-based system, augmented to mobile phones, can provide a much-needed prediction to the falls, where injuries and fracture possibilities can be significantly decreased. The purpose of this study is to develop a fall recognition system based on smartphone inertial sensors, which is a combination of accelerometer and gyroscope. The system can distinguish between falls and other activity daily livings (ADLs). The data output from the inertial sensor have been used by two different classifiers; artificial neural network (ANN) and support vector machine (SVM), where the objective is to find an accurate falling classifier using smartphone inertial sensors. Results show that SVM based classifier offers an accuracy of 99.27%, which outperforms the state of the art results that use smartphone data.
The aspect of power quality in a wind generation: Overview
Authors: Al Kadhimi B M , Mohammed A B
Published: May 2020

Because of fossil fuels cost is high and environmental issues pushes to renewable energy sources to be used significantly. One of these wind energy got a lot of investments. It is difficult for good power quality due to the behavior of wind turbine speed. It effects on the power and voltage of the component that connect with the wind turbine. A new technique must be developed and new control must be used to control the fluctuations and improve wind power performance. Also using possible excitation induction generators for safety issues. More over the smoothening wind power variation done by using some energy storage technologies. Using a static compensator for the harmonic current injection and reactive power compensation. Besides of improving power quality of wind turbine also the fault tolerance. Dynamic voltage restorer used to treat the reactive power compensation connected to a wind turbine.
Coefficients Estimates of Bi-Univalent Functions Defined by New Subclass Function
Authors: Al-Ameedee Sarah A , Galib Atshan Waggas , Ali Al-Maamori Faez
Published: May 2020

In this paper, we introduce and investigate some new subclassesSγn,q(λ,m,ϕ)andWxk,α(λ,δ,ϕ)of bi-univalent functions in the unit disk U, which satisfies the qusi-subordination condition. We obtain estimates the first two Taylor-Maclarurin coefficients |a2| and |a3|.
Design mathematical model for studying properties thin layers
Authors: Abdullah Enas Y , Abdulameer Ali M
Published: May 2020

In this paper, highlighted the study of properties thin films of squeeze film characteristics The Reynolds equation a commutating for speed molecules and squeeze action is mathematically derived. The Reynolds equation is disband for the hydrodynamic pressure and the bearing characteristics, such as load carrying capacity and time approach. It is found increases speed molecules for first layers lead to decrease hydrodynamic pressure and load compared to final layers case.
Techniques in De-Blurring Image
Authors: Muthana Rasha , Alshareefi Assad N.
Published: May 2020

Images nowadays are an integral part of our lives, whether in scientific applications or social networks and where there is an image, the concept of image blurring may occur. Blurred is a major cause of image degradation and reduces image quality. Blur occurs due to air noise as well as incorrect camera setup. Along with the blur effects, the noise also spoils the captured image. Deblurring is the operation for removing blur or noise and restoring the underlying high-quality image. Blur can be different types like Motion Blur, Gaussian Blur, and Average Blur.
A new Rule to Constrain Convolution Neural Network Architecture in Face Recognition System
Authors: AL-Khalidi Qusay , Motlak H.J , Al-Libawy Hilal
Published: May 2020

Face recognition (FR) system is an essential part of a biometric security system, which runs faster than other security methods and done remotely. One of the most important techniques that used in FR is the convolutional neural network (CNN). Traditionally, the choice of the CNN architecture is achieved by experimental trails. In this paper, a new approach is proposed to build a mathematical model that helps to select a proper architecture. This model is built from the experimental results by applying different architectures on the well-known dataset (Vggface2). By changing the class number, image number and convolutional layer number, where the accuracy of each case is recorded. Finally, the proposed model is evaluated on the sets of datasets (Essex. FEI, Caltech), where the accuracies of (99.13, 98.51, 97.78) respectively, are achieved. The evaluation results proved that the proposed model is an efficient for many types of small and middle scale dataset.
Radon Distribution in Baghdad Governorate by Using Remote sensing techniques
Authors: Khanjer Ebtesam F. , Hassan Wassan A. , Ismael Ban S. , Gazal Nawal K
Published: May 2020

The Radon gas fixations were estimated for toxins condition with in Baghdad governorate utilizing Rad-7device. The work comprises of 3rd sections; its initial segment incorporates the assurance of Rn222 gas fixations in air dust tests. The 2nd part includes measurements for radon in water in Baghdad. The third part includes radon in Soil in Baghdad. All these measurements were done to prepare maps for distribution of radon in soil, water, and air in using Arc-GIS system and landsat satellite image of Baghdad.
Automatic control systems: optimization and sensitivity study
Authors: Denisova L A , Karabtsov R D , Meshcheryakov V A , Shirokov I V
Published: May 2020

The paper discusses the optimization of a pulsed automatic control system (ACS) with constant parameters, which is used to control non-stationary objects. We obtained the dependences of the integral quality criterion on perturbations acting on the control object. The sensitivity of the ACS was studied by simulation using MATLAB / Simulink. The system was optimized based on the criterion constructed taking into account sensitivity to parameter variations. It is shown that the synthesis of the ACS insensitive to changes in characteristics is advisable only if the deviations of the parameters are small. In this case, the quality of automatic control will improve.
The general approach to the 3D-printing process quality estimation on the modified polymer substrates
Authors: Doronin F A , Nagornova I V , Rytikov G O , Varepo L G , Nazarov V G
Published: May 2020

The parameters defined the items quality FDM 3D-printed on the flexible modified polymer substrates were determined as exemplified by monitoring the 3D-process of the periodical elements forming on the oxyfluorinated PELD and PET films aimed to the production of the prototype model of a lab-on-a-chip device. Due to SEM, EDS and FTIR techniques application the correlation between the modification mode parameters and the elements operating stability was connected. The general approach to the 3D-printing process quality estimation on the modified polymer substrates is shown.
Experimental Studies for Determining the Optimal Method of Measuring Biophysical Signals
Authors: Kabanov A A , Nikonova G V , Shchapova L V
Published: May 2020

The subject of the study is a system for collecting and processing biophysical signals for controlling anthropomorphic prostheses. As a result of the work, structural and electrical circuits for measuring biophysical signals, processing and filtering schemes were proposed, and the necessary filters were calculated. Designed filters allow you to get rid of noise caused by artifacts of movements and your own signal instability, and can be used to design a system for collecting and processing electromyography signals. In conjunction with a digital filtering system and further processing, it is possible to adequately determine the presence of muscle contractions. The resulting system is small-sized and in combination with the software part of signal processing will allow you to determine key signal patterns and control anthropomorphic prostheses.
Empirical frame hyper-surfaces as models of multi-parametrical technological systems
Authors: Chizhik M A , Yurkov V Yu , Dolgova E Yu
Published: May 2020

This paper is devoted to the mathematical and computer simulation of multi-parameter technological systems. The method and algorithm can easily be used in spline-frame simulation of the systems. Simulation is based on experimental data and achieved by the variation of one-dimensional spline approximations. A set of variable one-dimensional cubic spline-frames generate the model of hyper-surface, which is a model of the process. Each of the spline-frames is the image of a section of input parameters area. Software realization is based on the single algorithm that is used repeatedly. The problem of building some model of hyper-surface is based on empirical irregular 0-dimensional frame. We consider the problem as an inverse problem of modeling. The method has been used in investigation some technological conditions of thread seams for sewing industry. We investigated the durability and harshness of the seam. Geometric models and parameter valuations were generated by special software. The equations and diagrams described our experiments with sufficient exactness and there were used for researching the process. The model together with software HYPER-DESCENT may be applied for simulation multi-parametrical systems or technological processes of light industry.
Geometric model of persecution by a group of one goal
Authors: Dubanov A A , Ausheev T V
Published: May 2020

This article describes a geometric model where a group of four objects pursues a single goal. The movement occurs on a plane, but if necessary, this model can be applied to an explicitly specified surface. The movement speed of all participants, both pursuers and targets, is constantly modulo. The goals and strategies of each of the pursuers are different. The goal and strategy of the target is determined by the behavior of one of the pursuers
Application of the Dupin cyclide in temple architecture
Authors: Salkov N A
Published: May 2020

In recent years, the construction of churches and temples has been rapidly developed, so the need for design and support for such constructions arose. A new department called “Temple architecture” even appeared at MArchI (Moscow Architectural Institute). The article considers a method for geometric construction of the surface of such objects as the dome of temples and churches from the parts of Dupin cyclides. As a result, two variants of domes made from the compartments of the Dupin cyclide were proposed. Based on the theoretical research, it becomes clear that there can be more design options, and if we use a special case of cyclides for construction - compartments of rotating cones - then many times more.
Evaluation of the efficiency of a small-sized electrothermal micro-thrusters with autonomous heating elements
Authors: Blinov V N , Lukyanchik A I
Published: May 2020

The work is aimed at solving urgent tasks – improving the efficiency of electrothermal micro-thrusters (ETMT) for microsatellites weighing up to 50 kg. The purpose of this work is to evaluate the effectiveness of a small-sized ETMT with Autonomous heating element (AHE) with a diameter of 4 mm on the basis of experimental studies. In the course of experimental studies, the ETMT temperature characteristics were determined for electrical power consumption in the range of 3-30 W using “cold” and “hot” switching schemes. The effectiveness of small ETMT with AHE diameter of 4 mm is a significant increase in temperature AHE and, as a result of heating of the working fluid and reducing the time of reaching the stationary mode of operation compared to ETMT with AHE diameter of 6 mm. The results of experimental studies have shown that a small-sized ETMT be successfully used in microsatellites correction propulsion system (CPS) with a power output of 10-30 W.
Possibilities of increasing the dimensional accuracy of nodular cast iron castings
Authors: Eletskaya A S , Shibeev E A , Garibyan G S , Eremin E N , Tiyan A V , Tokarev A A
Published: May 2020

This paper is devoted to influence of the size and number of graphite inclusions in high-strength cast iron on pre-shrinkage expansion and, as a result, on linear shrinkage and dimensional accuracy of castings. It was established that influencing the number and size of graphite inclusions it is possible to increase the dimensional accuracy of high-strength cast iron castings by two accuracy classes and significantly reduce mechanical processing allowances of cast iron in order to save metal.