bluuebunny/crossref_metadata_2025_split huggingface dataset:
Unmanned Navigation Development Prospects Based on Structural Analysis of Automated Vessel Control System
Authors: Danilin G V , Sokolov S S , Knysh T P , Singh Dr. Vijendra 
Published: November 2021

Abstract
The reduction of vessel crew counts and increased automation have been observed in marine and river vessels for several decades. These processes are based, firstly, on the development of modern technology and, secondly, on the urge to reduce the so-called human factor, which is recognized today as one of the key causes of water transport emergencies. It is expected that unmanned navigation will help reduce operational costs, increase the carrying capacity of vessels, and reduce the impact of the human factor on the safety of navigation. This, in its turn, requires the development of a reliable and safe automated control system for unmanned vessels. This article aims to assess the development prospects of unmanned navigation based on the structural analysis of such systems. In the first part of this article, the authors review the classification of control systems depending on the degree of vessel autonomy and the generalized structure of the unmanned vessel control system. In the second part, the authors review the control system structure for a remote-control unmanned vessel and that for an autonomous unmanned vessel.
PPG System Development for the Organism Physiological Parameters Monitoring with Artificial Intelligence Technologies
Authors: Akishin A D , Nikolaev A P , Pisareva A V 
Published: November 2021

Abstract
Monitoring such health parameters as cardiac rate (CR), respiration rate (RR), blood pressure (BP), degree of oxygen in blood (SpO2), body temperature and other requires careful approach to design and development of medical devices. New non-invasive methods introduced in measuring human physiological parameters based on photoplethysmography (PPG) demonstrated their significant potential in monitoring the state of an organism, but their use in wearable devices is largely hampered by exposure to motion artifacts. This article presents a device for photoplethysmographic studies using various adaptive algorithms for processing the registered signals. The work uses artificial intelligence technologies to monitor the heart rate exposed to external mechanical and electrical interference worsening accuracy characteristics of the system. Besides, system architecture was developed, and a device model was manufactured, which made it possible to measure the optimal algorithm for digital signal processing. When using the PPG system, methods of adaptive signal processing based on Wiener filters, filters on the method of least squares (MLS) and Kalman filtering were used. To ensure heart rate monitoring with the given accuracy, studies were performed with participation of volunteers, and analysis was carried out of the results of various signal processing algorithms operation. In the course of experimental studies, a method was proposed to estimate the heart rate calculation accuracy and to analyze the external noise filtering efficiency by adaptive algorithms. PPG designed and developed system made it possible to monitor the heart rate with the given accuracy, control the organism current state and could be used as a means of cardiovascular disease diagnostics.
Comparative Analysis of Intellectual Methods for Muscular Contraction Interpretation for Gesture Interface Implementation
Authors: Bunyaeva E V , Kuznetsov I V , Ponomarchuk Y V , Timosh P S 
Published: November 2021

Abstract
The paper considers comparative analysis results of the machine learning methods used for the gesture recognition based on the surface single-channel electromyography (sEMG) data. The data were processed using multilayer perceptron, support vector machine, decision tree ensemble (Random Forest) and logistic regression for the chosen four gesture types. The conclusion was derived on the analysis efficiency of these methods using commonly recommended accuracy metrics.
To the Evaluation of the Insulation State Based on the Analysis of Partial Discharges
Authors: Tetiora S Yu , Silin N V , Petrunko N N 
Published: November 2021

Abstract
The existing partial discharge models, their diagnostic value, and application area are analyzed in the article. The models are considered from the point of view of their improvement or the possibility of creating new diagnostic methods for electrical equipment based on the characteristics of partial discharges. As an example of the implementation of a new approach to partial discharge modeling, a quasi-deterministic model is considered, which makes it possible to obtain information on the real number of cavities in the insulation of high-voltage equipment.
Experimental Marine Studies of Liquid Respiration Technology for Diving/Surfacing of Biological Objects in Capsule to Depth of up to 1500 Meters
Authors: Polivtsev V P , Polivtsev V V , Osipov K N 
Published: November 2021

Abstract
The article considers the study of the liquid respiration technology for diving/surfacing of biological objects in the Black Sea to the depth of 500, 1,000, and 1,500 meters. The authors focus on safe diving/surfacing modes and depths. The authors developed and tried an autonomous capsule attached to a winch with a cable that can be used for the diving and surfacing of the immersed bioobject. The authors provide the key diving/surfacing speeds, as well as maximum diving depths for a dog under spontaneous breathing. The authors present the results of medical research of the bioobject before, during, and after diving involving electrocardiogram, electroencephalogram, as well ultrasound, x-ray, and instrumental tests.
The Principle of Construction of Capacitive Reactive Power Compensators with Three-Stage Regulation
Authors: Klimash V S , Tabarov B D , Antonov E G 
Published: November 2021

Abstract
It is proposed to reduce the number of electrical and electronic devices by 1.5 times in three-stage capacitor installations by changing the connections in the power circuit and using a special control method. The new principle of construction of reactive power compensators will allow, with minimal changes and additions to existing installations, to reduce the costs of their production and the cost of finished products. The existing installations contain three blocks of the same type of capacitors, each of which is equipped with an electrical and electronic device and resistors for their discharge. It is proposed to connect two of these three blocks in parallel without changing the design of the products, using a common electronic device for connecting and disconnecting the resulting block of capacitors with double capacity and a common electrical device in the capacitor discharge circuit of this block. A model is presented in the Matlab environment for the study of dynamic and stationary processes of three-stage reactive power regulation in a new scheme of a capacitor plant. Numerical experiments have shown that when the installation is switched on and off, as well as when switching from one stage of reactive power regulation to another, the proposed device does not create bursts of starting currents. After starting, it almost immediately enters the steady-state operation mode and when switching stages, it also immediately passes from one level of the steady-state values of such to another level of their steady-state values. The installation is switched off without switching losses and without arcing on the mechanical contacts, since thyristor switches with natural switching are switched off first, and then the de-energized mains switch.
Method of Switching on and Off a Power Transformer with a Capacitor Bank in an Electrothermal Installation
Authors: Klimash V S , Tabarov B D 
Published: November 2021

Abstract
The article is devoted to issues related to increasing the energy efficiency of industrial electrothermal installations, both in starting and stationary operating modes due to the use of capacitors and thyristor starters with special control. The results of a significant reduction in the duration of the transient process, elimination of surges and asymmetry of starting currents and voltage drawdowns are presented. The results of full compensation of the reactive power of the network in the steady-state mode are also presented. It is shown that the starting currents do not exceed their steady-state values and that the shutdown of the electrothermal installation is performed without the occurrence of an arc and switching losses at the contacts of the switches. Researches of an electrothermal installation with a capacity of 750 kV⋅A and a voltage of 380 / 80 V are made on the model in the Matlab environment.
A method for Improving the Accuracy of Reactive Power Regulation by a Capacitor Plant
Authors: Klimash S V , Tabarov B D , Klimash V S , Konstantinov A M 
Published: November 2021

Abstract
The problem of low accuracy of reactive power regulation by the most common three-component condenser installations in the industry and its impact on the quality of electricity and the efficiency of its consumption and use in industrial power supply systems is considered. To increase the accuracy of reactive power regulation by at least 2.3 times without changing the circuit of the capacitor plant and the number of switching equipment, a new control algorithm is proposed and described in detail. The results of testing a method for regulating reactive power in the Matlab environment based on the proposed algorithm for controlling capacitor blocks with changed parameters are presented. Numerical experiments have shown the possibility of seven-stage regulation, versus three-stage control in known industrial installations. The capacitor unit is switched on by a mains switch and then by thyristor switches without a surge of currents in the capacitors and without an asymmetry of currents in the network. The installation is switched off in the reverse sequence, first by thyristor switches with natural switching, and then by a mains switch without arcing on its contacts.
Analysis of Filtration Process Influence on the Results of Thermal Imaging Control of the Subsurface Defect’s Geometry in Solving Control Problems of Collaborative Robotic Systems
Authors: Bushuev S V , Romash E V , Bashevskaya O S 
Published: November 2021

Abstract
The paper proposes and experimentally verifies an approach for estimating the thermal imaging error depending from the method of the subsurface defect’s linear dimensions filtering for forming the appropriate commands of the control program in a collaborative robotic system. The results are presented for the absolute error estimation depending on the filtration method with a confidence probability p=0,9972.
The Method of Selecting Protection Devices in the Automated Design of an Electrical Complex of a Transport Vehicle
Authors: Fedorov E , Ferenets A , Mingazov A 
Published: November 2021

Abstract
The article describes the mathematical and software module of computer-aided design of vehicle electric systems: selection and verification of protective devices. The following problems are solved: calculation of currents in the circuit sections of scheme for normal and directive modes taking into account the changes in the current distribution as to the modes of consumption, calculation of the currents in the circuit sections of design scheme for short-circuit modes, checking the correct choice of protection devices as to the rated current, checking the correct selection of protection device in overloads in case of electric motor loads, determining the sequence of triggering of protection devices in the modes of short-circuit and checking the selectivity of protection, checking the protection devices for resistance to short-circuit currents
Computational and Experimental Method for Assessing the Thermal Strength of High-Loaded Diesel Engines
Authors: Belov V P , Apelinskiy D V 
Published: November 2021

AbstractThe article discusses the reasons of fatigue failure of pistons of high-loaded diesel engines. A deformation-kinetic criterion is proposed, generalized to non-isothermal loading, which allows more correct calculation of the number of thermal loading cycles before the appearance of fatigue damage. For a specific implementation of the proposed criterion, a calculated assessment of the piston stress-strain rate was carried out using the FEM. The boundary conditions for the calculation were obtained by thermometry of the piston head on a non-motorized thermal stand (TS). Comparison of the calculated and experimental values of the number of thermal cycles before the appearance of cracks on the edge of the combustion chamber (CC) of pistons made by casting and isothermal stamping is given.
Experimental Study of a Rotary Heat Exchanger with a Metal Mesh Matrix
Authors: Kostukov A V , Kosach L A , Dementiev A A 
Published: November 2021

Abstract
This paper describes the experimental study of a metal mesh matrix of a rotary heat exchanger model including calculation of its regeneration ratio. Temperature oscillograms showing the temperature in tne matrix channel are shown Also the pressure loss value is found for channels of the matrix. The pressure loss value for the case of having a matrix formed by flat metal plates was also calculated in order to compare the calculated values with the ones obtained experimentally for the mesh matrix.
Research of Methods of Optimal Design of Special Electric Drives
Authors: Karandey V Yu , Popov B K , Popova O B , Afanasyev V L 
Published: November 2021

Abstract
Problems of optimization of special electrical and electromechanical systems in modeling, creation and design are solved mainly by methods of mathematical programming. The task of mathematical programming is to find extremes of the function of many variables in the presence of restrictions on variables, which creates fundamental difficulties. To solve such problems, the number of methods for solving the general problem of mathematical programming is currently expanding significantly. In this regard, the trend in the development of mathematical programming is following the path of highlighting and studying various subclasses of problems. The use of certain specific features of the tasks of the selected subclass creates opportunities for their more effective investigation and solution. Examples of such subclasses give convex, quadratic, linear programming problems, transport-type problems, and others. Geometric programming is also a section of mathematical programming that research a certain class of optimization problems. However, when using geometric programming, you have to apply linear, nonlinear programming, the concept of convex programming. Using optimization methods will allow you to correctly investigate, design and create special electric drives.
Research of the Stegosignal Propagation through the Acoustic Environment
Authors: Statsenko L G , Durneva U A , Klescheva N A , Bernavskaya M V 
Published: November 2021

Abstract
The paper considers two main applications of stegosystems: as a digital watermark, for copyright protection, and as a method for secretly transmitting information through an acoustic environment. A stegosystem is studied theoretically and experimentally when information is transmitted over different distances in an acoustic medium in the presence of extraneous noise. Nowadays great attention is paid to the protection of intellectual property. Illegal distribution of media content, including copies of musical compositions, is widespread and reaches unprecedented proportions. Protecting audio files from unauthorized copying and using becomes increasingly important. Digital watermarks are a promising method for solving this problem. The purpose of the article is to develop an effective method for protecting audio files from illegal use by embedding a digital watermark (DW). After detection the illegal distribution of their product, the copyright holder will be able to track the presence of the digital watermark and apply to the court for damages.
Analysis of Physics Learning Outcomes in Eleventh Grade Natural Science Students of Public Senior High School in Palembang After Using E-Learning During COVID-19 Pandemic
Authors: Zaki Ahmad , Sinaga Parlindungan , Kaniawati Ida 
Published: November 2021

Abstract
The purpose of this study was to determine the comparison of student learning outcomes after carrying out Physics learning activities using e-learning during COVID-19 pandemic. This type of research is descriptive qualitative with a comparative method. The sampling technique was simple random sampling with three public senior high schools in Palembang, as many as 360 eleventh grade natural science students in two classes of the first semester in the academic year 2019/2020 and 2020/2021. The instruments used are interview guides and documentation studies. Analytical techniques using a review of the study documentation assessment of each basic competence of Physics in the first semester of eleventh grade natural science and interviews with same Physics teacher in different academic years. From the results of documentation studies in three public senior high schools equally have significant differences in minimum competency standards for Physics material of elasticity from different academic year, also the results of interviews with the teacher this result happened because many students did not understand and had problems working on the assignment, besides that there were more obstacles in online learning compared to offline learning.
Cooperative Learning Model in Science Online Learning for 9th Grade Students
Authors: Namira Nur Rachmadewi Shafa , Luthfiyah Nurulita Hana , Nur Filhak Rakhil , Az Zahra Salsabilla , Pemanasari Anna , Eliyawati  
Published: November 2021

Abstract
Many instructional strategies play an important role in science learning, especially for cooperative learning. This research study is to observe and analyze how the student cooperates in teaching and learning of science in online learning. This research used qualitative research methods, and observation and interviews as a tool to collect the data. The observations were conducted at an international junior high school in Kota Bandung, included 15 female students and 1 teacher as participants. Instruments of research that we used are the rubric of the teaching-learning process, the rubric of student activity, and the rubric of the cooperative learning model. From the data analysis, the learning model used in this online class meeting is proper enough for it is fulfilled the syntax of cooperative learning. So Cooperative learning models can be a good way to teach much content at a time effectively. However, managing students to be more active is needed in the learning process.
Development of character survey instruments in national assessment of Indonesia for physics teachers
Authors: Suhendi HY , Mulhayatiah D , Nasrudin D , Ardiansyah R 
Published: November 2021

Abstrak
In order to support the realization of the aspiration to build character as mandated in Pancasila and the Preamble of the 1945 Constitution and to overcome current national problems, the Government of Indonesia has made character education one of the priority programs for national assessment. This is a challenge for educators, teachers and education practitioners to make it happen. However, until now there has been no instrument capable of measuring character. This study aims to determine the development process and the feasibility and benefits of a character survey instrument which is part of a national assessment that must be implemented by teachers to students in schools. The research method used is a development research method with the ADDIE research design coined by Dick and Carry. This research was conducted at several schools in West Java with a sample of 10 physics teachers who were selected by purposive sampling technique. The results showed that the character survey instrument is a valid and reliable instrument with a high category. So, it can be concluded that this character survey instrument is an instrument that is suitable to be used for assess and identify the character of students.
Gases Theory Representation Instrument (GeTRI): A Practical Tool To Analyze Sundanese Students’ Conception in the COVID-19 Pandemic
Authors: Purwanto M G , Gitnita S , Riani V R , Devialita A , Nurjanah A , Hendriyani D , Suhandi A , Samsudin A 
Published: November 2021

AbstractThis research purposes to promote a Gases Theory Representation Instrument (GTRI) as a tool to identify the students’ conception on kinetic theory of gases. The method used in this research was FODEM (Formative Development Methods) model which has three comprehensive steps, which are need analysis, implementation, and formative evaluation. The participants involved in this research were 26 high school students in Sundanese tribe. The students’ responses were analyzed using Rasch model, which involved item reliability, person reliability, validity, difficulty level and students’ conception distributions. Students’ conception were classified into six categories which are Sound Understanding (SU), Partial Positive (PP), Partial Negative (PN), Misconception (MC), No Understanding (NU), and No Coding (NC). Based on the data analysis, it can be concluded that students’ conception are typically in the SU and PP categories. Besides, the Gases Theory Representation Instrument (GTRI) is reliable and valid to identify students’ conception on kinetic theory of gases.
Identification of students’ difficulties in understanding of vector concepts using test of understanding of vector
Authors: Latifa B R A , Purwaningsih E , Sutopo S 
Published: November 2021

Abstract
This study is aimed to identify students’ difficulties in understanding vector concepts in physics because many students think that vector concept is very difficult to understand. This research used an embedded approach research design with quantitative descriptive methods and the sampling used a random sampling technique. Total sample of 142 students from two different schools in Central Lombok district. Test of understanding of vector (TUV) used to test the understanding of students consist of 20 item questions, then followed by interview session with several students. Kruskal-Wallis non-parametric descriptive and inferential statistic was used to performed data analysis. The results of this study indicate that (i) students’ ability to understand vector concepts is still lacking and tends to be very lacking; (ii) the most difficult items for students are the unit vector graphic representation and the graphical representation of vector multiplication. The concept of vector is still considered very difficult for students, especially if the item questions use graphical representations. For further researchers, it is better to conduct a study related to what kind of learning system can support and reduce the difficulties faced by students in learning vector concepts especially on graphical representation.