bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparison of Control Algorithms by Simulating Power Consumption of Differential Drive Mobile Robot Motion Control in Vineyard Row
Authors: Hrubý Dušan , Marko Dušan , Olejár Martin , Cviklovič Vladimír , Horňák Dominik 
Published: December 2021

Abstract
The paper deals with comparing electricity power consumption of various control algorithms by simulating differential mobile robot motion control in a vineyard row. In field of autonomous mobile robotics, the quality of control is a crucial aspect. Besides the precision of control, the energy consumption for motion is becoming an increasingly demanding characteristic of a controller due to the increasing costs of fossil fuels and electricity. A simulation model of a differential drive mobile robot motion in a vineyard row was created, including robot dynamics for evaluating motion consumption, and there were implemented commonly used PID, Fuzzy, and LQ control algorithms, the task of which was to navigate the robot through the centre of vineyard row section by measuring distances from trellises on both robot sides. The comparison was carried out using Matlab software and the best results in terms of both power consumption and control accuracy were achieved by LQI controller. The designed model for navigating the robot through the vineyard row centre and optimized controllers were implemented in a real robot and tested under real conditions.
Mechanical Properties of Wheat Grains at Compression
Authors: Kubík Ľubomír , Božiková Monika , Kažimírová Viera 
Published: December 2021

Abstract
Hook’s law for evaluation of the modulus of elasticity of wheat grains and its general behaviour under compressive loads were studied. Whole specimens were subjected to compressive loading between metal parallel plates. The mechanical properties of grains were determined in terms of average failure strengths of grain bran and whole grain; deformation; and modulus of elasticity. The mechanical properties of very dry grains of the winter wheat Triticum aestivum L. with the moisture content of 10.3% were studied. The failure strength of grain bran was 4.43 MPa at the deformation of 10.7%, and the failure strength of whole grains was 4.88 MPa at the deformation of 13.5%. The modulus of elasticity of grains was 43.67 MPa. The apparent energy density at bran failure strength was 0.261 MJ·m−3, and 0.470 MJ·m−3 on the level of grain failure strength of the whole grain. The bran border structure of central inner part of grains was studied using microscope digital sections of longitudinal cuts of the grains using the image computer processing method. The area proportion of starch and pericarp of the border parts of grains was studied to describe the border texture of central sections of grains.
Thermoregulation in humid climate-adapted and Savannah breeds of goats exposed to West African cold (harmattan) season
Authors: Habibu Buhari , Umar Kausar Mohammed , Yaqub Lukman Surakat , Salifu Sadat , Makun Hussaina Joan 
Published: December 2021

Abstract
The West African Dwarf (WAD) goats have hereditary dwarfism and are adapted to the humid climate. The study compared the cold tolerance of WAD and Savannah (Red Sokoto and Sahel) goats during the peak of the West African cold season in the Northern Guinea Savannah of Nigeria. A total of 18 adult non-pregnant, dry does comprising equal number of each breed (six per breed) were used for the study. Thermoregulatory variables were recorded four times in the morning (07:00 h) and afternoon (13:00 h) hours at two-day intervals. Results revealed that irrespective of the hour of day, the WAD had significantly (p < 0.05) higher respiratory rate when compared with Red Sokoto and Sahel goats. The diurnal afternoon rise in respiratory rate and the magnitude of afternoon rise in rectal temperature was higher (p < 0.0001) in WAD than Sahel and Red Sokoto goats. The body surface temperature in the morning hours was significantly lower in WAD compared with Sahel breed, while in the afternoon hours, the inter-digital space temperature was significantly lower in WAD compared with Savannah breeds. However, there were no significant (p > 0.05) differences in heart rate, rectal, head and leg temperatures between the breeds in both morning and afternoon hours. Discriminant analysis revealed that the morning hours induced greater homogeneity in the thermoregulatory responses between the breeds adapted to the humid and Savannah climates as compared with the afternoon hours. It was concluded that although WAD goats employed more intense peripheral vasoconstriction to survive cold exposure and demonstrated greater diurnal amplitude in thermoregulatory variables, they maintained comparable core body temperature as the indigenous Savannah breeds. Thus, suggesting that despite the hereditary dwarfism, the WAD goats could conserve body heat during the West African cold season in the Northern Guinea Savannah zone of Nigeria.
Risk Averseness and Emotional Stability in e-Commerce
Authors: Popchev Ivan , Ketipov Rumen , Angelova Vera 
Published: December 2021

Abstract
The study aims to examine the issue of the relationship between Emotional stability, one of the fundamental personality determinants, and users’ Risk Averseness, on the one hand, and user behavior in the field of e-Commerce, on the other hand. In the beginning, a brief overview of today’s primary benchmark for the measurement of human personality – the Big Five Model is proposed. A study with 226 participants has been conducted for the aim of the research, based on the TIPI test. The TIPI test is a validated and abridged version of the Five-Factor model. The result of the conducted survey confirms the existence of significant relationships between personality determinant Emotional stability and consumer’s Risk awareness, on one side, and some of the observed main functionalities of the online stores, on the other side. Two regression models of the field of Machine Learning (Linear Regression and Random Forest) have been implemented to make a reliable forecast about the user’s preferences in the process of online shopping. The conclusions made rely on the obtained results and analysis.
Hybrid Role and Attribute Based Access Control Applied in Information Systems
Authors: Penelova Maria 
Published: December 2021

Abstract
It this paper it is proposed a new access control model – Hybrid Role and Attribute Based Access Control (HRABAC). It is an extension of Role-Based Access Control (RBAC). HRABAC is designed for information systems and enterprise software and combines the advantages of RBAC and Attribute-Based Access Control (ABAC). HRABAC is easy configurable, fine-grained and supports role hierarchies. The proposed model HRABAC describes the access control scheme in Laravel package laravelroles/rolespermissions, which is developed by the author of the paper, as an answer to the requirements of practice of fine-grained and easy configurable access control solution. Laravel is chosen, because it is the most popular and the most widely used PHP framework. The package laravelroles/rolespermissions is developed on Laravel so that maximum number of programmers could use it. This package contains working and tested functionalities for managing users, roles and permissions, and it is applied in accounting information system.
A Hybrid Method for Payload Enhancement in Image Steganography Based on Edge Area Detection
Authors: Mohsin Nadia A. , Alameen Huda A. 
Published: December 2021

Abstract
In this research a new method for increasing the embedding capacity in images based on the edge area is proposed. The new approach combines Canny and Prewitt edge detection techniques using OR binary operation. The secret message is concealed using the Least Significant Bit (LSB) method. Embedding capacity, PSNR, SSIM, and MSE values are used as evaluation metrics. Based on the resulted values, the proposed method showed higher embedding capacity while keeping the PSNR, SSIM, MSE values without major changes of other methods which means keeping the imperceptibility quality of the stego image.
Testing Deformation and Compressive Strength of the Frozen Fine-Grained Soils with Changed Porosity and Density
Authors: Lemenkov V. , Lemenkova Polina 
Published: December 2021

Abstract
Current paper focuses on the laboratory experiments performed wit aim to test the deformation in the frozen loam soil specimens. Loam frozen soils are subject to the external effects, such as climate and environmental impacts including temperature changes. Soil heave is one of the key features restraining possible area development: construction of buildings, roads and railways. Necessarily, this requires the improvements of methods of the assessment of heave. This research evaluated the compressive strength and deformation in several specimens of the frozen soil. The approach included varying load and physical properties of soil specimens: porosity, pore filling, moisture, density of soil particles and dry soil density. Besides during the experiment, the external conditions were changed: decreased temperature and increased load pressure. The experiment is based on the UPG-MG4-01. The paper presented the laboratory tests of heave and compressive strength of the frozen soils using applied geotechnical methods.
Three Stages of Composite Specimen Destruction in Static Failure
Authors: Urbaha M. , Agafonovs I. , Turko V. , Fescuks J. 
Published: December 2021

Abstract
The paper presents the results of standard specimen fracture made of anisotropic carbon fiber plastic with an epoxy matrix. Static stepwise loading of the specimen was carried out on an Instron 8801 testing machine to determine the characteristics of ductile fracture G1C in the first mode in accordance with ASTM D5528.
During loading, the parameters of acoustic emission (AE) signals, such as AE impulse amplitudes and their energy were synchronously recorded. At the same time, the magnitude of the opening and the growth of the crack initiated by the artificial cut at the end of the specimen were recorded.
According to the analysis of the acoustic emission signals, three zones with different G1C behaviour were identified: initial crack propagation, its stationary growth and accelerated fracture of the specimen. The zonal character of the change in the acoustic emission signals made it possible to determine the energy of the acoustic emission signals as diagnostic evidence for the onset of rapid destruction of the specimen.
The amplitude of the AE-signals in the zones, however, remained constant. Online monitoring of changes in the energy of acoustic emission signals will prevent the onset of rapid destruction of an object in places of its deformations. The paper does not aim at defining G1C as usual. It presents the investigation of the fracture stages for a composite material using an acoustic emission method.
Epojé y ensimismamiento
Authors: Martín Javier San 
Published: December 2021

Abstract
Mi intención en esta ponencia es hacerles una presentación de la fenomenología en España, para lo cual repetiré ideas que he expresado en la introducción al libro de Ortega Schriften zur Phänomenologie
15 y, en segundo lugar, resumiré una parte del contenido de la conferencia que pronuncié en el penúltimo Congreso de la Sociedad Española de Fenomenología. 16
Common pulmonary computed tomography signs and their clinical relevance: A review
Authors: Desai Unnati , Joshi Jyotsna M 
Published: December 2021

Abstract
With the advent of computed tomography (CT) in respiratory medicine, a greater delineation of the respiratory structures has been possible in the two-dimensional space. The various CT techniques used by pulmonologists include the high-resolution computed tomography (HRCT) thorax with expiratory scans, contrast-enhanced CT (CECT) thorax, CT thorax, CT pulmonary angiography (CTPA) and rarely a CT aortography/angiography. Each of the imaging techniques presents stronger and weaker points. In this paper, radiological lesions are classified according to their location. Such abnormalities are observed in the airways, in the lung parenchyma, in the interstitium and last but not least in the pleura. The review mainly addresses radiological lesions with higher specificity because they are key elements in establishing a definitive diagnosis. In conclusion, performing a chest CT is vital in the diagnosis and management of respiratory conditions.
Controlling a Small Mobile 3-Pi Robot Movement in a Maze Via the Neural Network Using Back-Propagation Learning Method
Authors: Horváth Dušan , Červeňanská Zuzana 
Published: December 2021

Abstract
The contribution is focused on technical implementation of controlling a small mobile 3Pi robot in a maze along a predefined guide line where the control of the acquired direction of the robot’s movement was provided by a neural network. The weights (memory) of the neuron were calculated using a feedforward neural network learning via the Back-propagation method. This article fastens on the paper by the title “Movement control of a small mobile 3-pi robot in a maze using artificial neural network”, where Hebbian learning was used for a single-layer neural network. The reflectance infra-red sensors performed as input sensors. The result of this research is the evaluation based on the experiments that served to compare different training sets with the learning methods when moving a mobile robot in a maze.
Case Study of Building a Digital Twin for a Production System
Authors: Burčiar Fedor , Važan Pavel , Pulišová Simona 
Published: December 2021

Abstract
As the term of Industry 4.0 becomes more and more relevant with each passing day, it is up to researchers and companies to find solutions to integrating all the technologies it covers. One of those technologies, even though not highly developed, is simulation and building Cyber-Physical Systems for gathering data and improving the production processes. In the research described in this paper, we focused on integrating production data with simulation models in order to make the process of understanding and learning about complex production systems as simple and as quick as possible. This paper contains three sections. The first one introduces the theoretical fundamentals of our research. The second one focuses on the methods used to create a digital model of production system. The final one discusses the results of the conducted experiments, and their impact on further research.
A Design Optimization Study for the Die Dimensioning Using the Locking Nut Folding Simulation
Authors: Ülüver Bozkurt , İlyas Kacar 
Published: December 2021

Abstract
An inverse analysis based on optimization process is performed to determine die curvatures for a locking nut’s flange folding process which has highly nonlinear material behaviour. The nut material is AISI C1040 steel. The ring material is polyamide 6. The Chaboche’s nonlinear kinematic hardening rule is combined with bilinear isotropic hardening model as a hardening rule for the plasticity model combined with associated flow rule and von Mises yield criterion. The inverse analysis is applied to determine the curvatures by using genetic algorithm optimization method based on dimensional accuracy. The optimum mould curvatures are determined. So a comprehensive methodology is presented for determination of curvatures.
Application of EDAS, MARCOS, TOPSIS, MOORA and PIV Methods for Multi-Criteria Decision Making in Milling Process
Authors: Trung Do Duc 
Published: December 2021

Abstract
Low surface roughness and high Material Removal Rate (MRR) are expected in most machining methods in general and milling method in particular. However, they sometimes do not occur, for example, the MRR is often small as the surface roughness is low. In this case, the decisions made should ensure that desires are simultaneously satisfied. This situation leads to a problem known as multi-criteria decision making (MCDM). In this study, five methods including EDAS, MARCOS, PIV, MOORA and TOPSIS are used together for the decision-making in the milling process. The purpose of the research is to determine the value of cutting parameters for both the low surface roughness and large MRR. The comparison of these methods for finding the best is carefully discussed as well.
Structural Strength of Cemented Carbides
Authors: Olena Soroka , Iuriy Rodichev , Borys Vorontsov , Roman Protasov 
Published: December 2021

Abstract
The concept “structural strength of tool materials” got further development. The refusals of cemented carbide cutting plates, when heavy machining were analyzed. It was shown that 70…80% of refusals are the microchipping of cutting edges, tool cutting part chipping, cutting plate macrofracture. To assess cutting plate total carrying capacity and the influence of different methods of cemented carbides modification, bending tests were held. Local fracture resistance and damageability of cutting edge were assessed under its continuous scanning.
Assessment on the Optimum Performance of a Novel 3 Axes Micro EDM Developed for Commercial Applications
Authors: Suresh P , Venkatesh Raja K 
Published: December 2021

Abstract
A low cost three axes commercial microEDM machine has been developed indigenously in order to implement precision micromachining. The developed microEDM consists of various components such as machining chamber, X-Y table, tool feed and tool holder assembly, dielectric circulation system, power supply and automatic driving devices to control the spark gap distance. The setup is capable of performing the 8µm movement in Z-axis.The developed 3 axes machine and the commercial available machine are investigated with the most important process parameters such as Current, Pulse on time and Pulse off time in order to study the Material Removal Rate (MRR) and Tool Wear Rate (TWR). The material chosen for the current research is Stainless Steel 316L, which has high corrosion resistance and the electrode was tungsten 300µm. In most of the experiments, the developed machine has performed with 6.52% higher MRR and 26.10% Lower TWR. This is due to the effective spark gap circuit developed with the use of hall current sensor.The mathematical model of MRR and TWR are obtained by correlating the process parameter using Response Surface Methodology (RSM).The chosen objectives are contradictory in nature, we employ a non-dominated Genetic algorithm to find the optimal process parameters. The developed 3 axes microEDM has yield a 10.14% and 33.12% better performance on optimum maximum MRR and minimum TWR respectively when compared to the commercial machine.
Effects of Surface Roughness and Supply Inertia on Steady Performance of Hydrostatic Thrust Bearings Lubricated with Non-Newtonian Fluids
Authors: Singh Udaya P. 
Published: December 2021

Abstract
The objective of present theoretical analysis is to study the combined effects of surface roughness and fluid inertia (including the inertia of the fluid in the supply region) on the steady performance of stepped circular hydrostatic thrust bearings lubricated with non-Newtonian pseudoplastic fluids using Rabinowitsch stress-strain model. To account for the effects of surface roughness, the classical Christensen theory of rough surface has been taken. Analytic expressions for film pressure in bearing regions have been established for radial and circumferential patterns of roughness. Numerical results for film pressure, load carrying capacity and lubricant flow rate has been plotted and analysed. Due to surface roughness and fluid inertia in overall regions, significant improvement in performance properties have been observed.
ACTIONS OF THE US AND SOUTH VIETNAM SPECIAL DIVISIONS ON THE "HO CHI MINA TRAIL" IN 1961-1967. BASED ON THE MEMOIRS OF AMERICAN WAR PARTICIPANTS
Authors: Ivanov V. V. 
Published: December 2021

The article devoted to the analysis of the actions of special forces of US and South Vietnam during 1961–1967. One of the main tasks of these units during Vietnam war – destruction main objects of «Ho Chi Minh Trail» in South Vietnam, Laos and Cambodia. The work is built with the assistance of a memoir – translations memories combatants in South Vietnam and Laos, soldiers and commanders of Army of US, South Vietnam and Democratic Republic of Vietnam (DRV). The materials housed in the monographs of American and Vietnam researchers of the Indochina conflict, 1960–1970-s.In the early 1960s, in the setting of active infiltration teams of PAVN from DRV administration of USA adopted decision to send to Indochina units of special forces (Green Berets). Many of the military personnel who served in Vietnam belonged to 5th and 7th Special Forces Groups. Some Green Berets were assigned to the U.S. Military Assistance Command’s Studies and Observation Group (SOG) for making top secret intelligence operations and helped train the South Vietnamese special forces (LLDB). The most Green Berets defended South Vietnam’s border from infiltration from DRV. Apart from Green Berets, special units of the US NAVY were also active in South Vietnam. The main task of the special forces of the NAVY was the blockade of all waterways supplying partisans from North Vietnam and Cambodia by means of ambushes, sabotage, laying of mines and raids on bases of PAVN. In 1965-1967s mixed teams of Green Berets and LLDB conducted long-range reconnaissance missions into Laos and directed air strikes against the «Ho Chi Minh Trail». The U.S. aircraft bombed the «Ho Chi Minh Trail» daily, targeting areas based on electronic detection devices and intelligence gained by covert teams that infiltrated the area. However, these efforts could not slow down the movement of troops of PAVN, supplies southward along the «Ho Chi Minh Trail». The author paid attention to the creation units of special forces as part of army units of US Army situated in South Vietnam during 1965–1967. Special attention is paid by the author to the analysis secret operations of Green Berets against «Ho Chi Minh Trail». The author concluded that the special forces of USA and South Vietnam failed to achieve the set goals.